Link-Belt® Screw Conveyorslargest supplier of screw conveyors, feeders and components. You'll find hard-working Link-Belt® Screw Conveyors in a broad range of applications, handling

Link-Belt®Screw Conveyors

www.syntronmh.com

Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Description of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ComponentsClamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Conveyor Screws, Helicoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Conveyor Screws, Sectional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Covers, Flared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Covers, Hip Roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Covers, Semi-Flanged and Flanged . . . . . . . . . . . . . . . . . . . . . . . 86

End Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

End Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Flighting, Helicoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Flighting, Sectional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Ribbon Conveyor Screws and Flighting . . . . . . . . . . . . . . . . . . . 56

Seal Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Seals, Trough End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Shafts, Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Shafts, Drive and End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Slide Gates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Split Flight Couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Spout, Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Spout, Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Components (cont'd.)Shrouds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Supporting Feet / Saddles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Trough End Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Troughs, Double Flanged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Troughs, Flanged and Angle Flanged . . . . . . . . . . . . . . . . . . . . . 83

Troughs, Flared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Troughs, Tubular . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

EngineeringCapacity Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Component Groups - Class of Service . . . . . . . . . . . . . . . . . . . . . 39

Component Group Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Conveyor Designation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Conveyor Screw Deflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Horsepower Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Material Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Selection of Conveyor Size and Speed . . . . . . . . . . . . . . . . . . . . 35

Screw Feeders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Torsional Ratings of Conveyor Screw Parts . . . . . . . . . . . . . . . . 43

Layout and DesignLayout Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1

Let Syntron Material Handling’s knowledgeable team help your

business with conveying, feeding, screening, elevating, vibratory

flow aids, and mining controls of bulk product. Whether

optimizing existing systems or starting from the ground-up

on new and customized plants or mines, our dedicated

staff will provide you with the most efficient and cost-

effective solutions.

An international leader for innovative solutions,

Syntron Material Handling can improve the

technology customers are already using. The

Link-Belt® expertise and equipment have been

instrumental in developing some of the world’s

largest belt conveyors. The Syntron® feeders

are instrumental to supplying energy sources

and material handling efforts across the globe.

While management leads the way, the real

heartbeat of Syntron Material Handling is a team

of employees that have taken idlers, feeders and

material handling equipment to new levels of

excellence. Many have fine-tuned their skills for more

than 20, 30, 40 or even 50 years. Centering our entire

operation in Saltillo, MS allows us to maintain the

highest Quality Control Standards and on-time deliveries.

Our Quality Management System is certified to the ISO

9001:15 standard. We are a charter member of CEMA, and

active members of NSSGA, NMA, SME, FEMA, and PMMI.

For all your Aggregate needs contact the leader…

Syntron Material Handling. Moving the World with

Link-Belt® and Syntron® Brands.

Proven Engineered Products – Complete Material Handling Solutions

2 Dimensions subject to change without notice. Certified prints are available upon request.

Greek mathematician and physicistArchimedes is acknowledged as theinventor of the screw conveyor in 235-240B.C., and essentially his design has notchanged since then.

Syntron Material Handling and Link-Belt®added the new and innovativeapplications which make the Archimedianscrew the indispensable tool it is. Plus,Syntron Material Handling's conveyorequipment specialists improved materialsand fabrication techniques and addedelectricity as a power source in the 125years we nave specialized inmanufacturing screw and conveyorcomponents.

To the basic Archimedian screw Link-Belt® and Syntron Material Handlingadded conveyor systems and screwfeeders, designed them for everyconceivable application and manufacturedthem so well we have become thestandard for the industry.

Application engineering is a major reasonfor the industry's wide acceptance of theLink-Belt® screw conveyor. Studiedattention to detail during this phaseeliminates costly installation andoperation errors.

Close tolerance machining and fabricationin our state-of-the-art manufacturingfacility assure equipment quality andperformance.

Our ability to meet your needs with abroad selection of screw conveyors andcomponents is important to you, plus yourconfidence that the equipment youpurchase from Syntron Material Handlingwill earn its stripes and pay its own way,giving you a good return on yourinvestment.

Link-Belt® Screw Conveyors and Screw FeedersQuality Bulk Handling Equipment that Pays Its Way

Link-Belt® Screw Conveyors serve modernindustry in a wide varietyof ways:

• Conveying • Distributing

• Collecting • Mixing • Heating

• Cooling • Elevating • Batching

• Blending • Aerating • Providingcrystallization or coagulant action and more.

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Unmatched versatility.

Syntron Material Handling is industry'slargest supplier of screw conveyors, feedersand components. You'll find hard-workingLink-Belt® Screw Conveyors in a broadrange of applications, handling everythingfrom alfalfa meal to zinc oxide-over 250types of materials. And it doesn't matterwhether the material is light or heavy, fineor coarse, granular or flaky, hot or cold, wetor dry, sluggish or free-flowing. SyntronMaterial Handling’s Link-Belt® ScrewConveyors can handle it effectively andeconomically.

There is a wide selection of Link-Belt®Screw Conveyor types to choose from. We make a complete line of screw feeders,conveyor screws, troughs, trough ends,hangers, bearings, shafts, seals and drives.

Top Left: Granular feed supplement beingconveyed into storage at a poultry processingfacility.

Center Left: Heilcoid flight conveyorscrews perform efficiently on many snowthrower models.

Center Right: Twin 12-inch diameter screwconveyors with fully enclosed dust-tighttroughs handling pulverized boiler fuel inpower generating plant.

Bottom: Helicoid screw conveyors are essentialcomponents in this flour collecting systemlocated in a large bakery.


Engineered for every type of service.

No one can match our ability to give youthe right equipment for your application.Syntron Material Handling engineerspioneered the development of screwconveyors and components for the widestrange of materials, purposes andapplications. Whether the job involveslight-duty service-conveying egg powder,for example-or severe operatingconditions-like round-the-clock coaldelivery to a power plant-we have the in-depth knowledge and experience toprovide just what you need.

Link-Belt® Screw Conveyors are ruggedlybuilt, accurately manufactured andperformance proven. And our unequalledfield experience is your assurance of thebest in service and recommendations.

Clean, compact design saves space,simplifies installation.Link-Belt® Screw Conveyors adapt readilyto tight quarters and congested locations.No matter how many twists and turns youroperation takes, there is a Link-Belt®space saving Screw Conveyor to fit. Ourconveyors operate effectively in horizontal,vertical or inclined positions. Theircompact design permits easy installation.And they're simple to support.

If you should need replacement parts, you can count on controlled-tolerancestandardized parts that meet CEMAspecifications. They're interchangeable forfast, easy assembly, and they don't requirespecial tools.

So if space is at a premium, or if you wantsimple installation and maintenance forbetter on-line performance, dependableLink-Belt® Screw Conveyors are your bestchoice.

Top: Sugar is handled by twin screw feeders andhelicoid conveyors in this large bakery. Drop-bottom troughs permit easy access and quickcleaning of all parts.

Center: Screw conveyor augers are used throughoutthis combine for gathering, conveying, elevatingand distributing the harvest.

Bottom Left: Heavy-duty sectional flight conveyoraugers installed on boring machine.

Bottom Right: Totally enclosed screw conveyors canassure a clean, safe operation.

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When you buy from Syntron MaterialHandling, you can rely on our factory-stocked equipment and parts. You keepdowntime to a minimum because you getfast turnaround-from order entry to partsdelivery at your plant or jobsite.

When it comes to bulk material handling,think Syntron Material Handling. Syntron Material Handling has theuncommon ability to solve any screwconveying problem you might face. We’vegot the equipment selection experienceand the customer service you expect tomaintain and operate your facility.

Top Right - Over 40 feet of screw conveyors carry maltand rice from storage to mills in this factory.

Center Left - Typical installation provides close fittinggates and connections,

Center Right - Helicoid screw conveyor delivers 50 tonsof coal per hour to boiler room bunkers.

Bottom - Granular shell lime distribution system at alarge chemical facility.

Nearby service when you need it.


Component Description

Screw conveyors are one of the oldest andsimplest methods for moving bulkmaterials and consist primarily of aconveyor screw rotating in a stationarytrough, Material placed in the trough ismoved along its length by rotation of thescrew which is supported by hangerbearings. Inlets, outlets, gates and otheraccessories control the material and itsdisposition.

Screw conveyors are compact, easilyadapted to congested locations and can bemounted horizontal, vertical, and ininclined configurations. Their supports aresimple and easily installed.

These versatile conveyors can be used to control the flow of material in pro-

processing operations which depend uponaccurate batching . . . or as a mixer, agitatoror stirrer to mix and blend dry or fluidingredients, provide crystallization orcoagulant action, or maintain solutions insuspension.

Screw conveyors can be effectively sealedto prevent dust or fumes from escaping ordirt or moisture from entering. They can bejacketed to serve as a dryer or cooler, orfurnished in a wide variety of materials toresist corrosion, abrasion or heat.

Screw conveyors are used as earth augersto dig post holes or to bore underhighways for installation of culverts. Theyare also used extensively on combines,

threshing machines, hay bailers, fodderblowers and many other farm machines.

Screw feeders are modified screwconveyors used to control the flow ofmaterial at a constant or variable rate fromtrack hoppers, storage hoppers, bins ortanks. They are suitable for handling awide variety of materials ranging fromfines to a combination of fines and lumps.Under many conditions, feeders are alsoused as a valve.

Screw feeders are totally enclosed,compact, simple in design and dust-tight.They are economical to install, operate andmaintain.

Conveyor ScrewThe conveyor screw is the rotating portionof a screw conveyor which imparts smoothand positive motion to the bulk materialbeing conveyed. It consists of spiral

flighting mounted on a pipe and is madeeither right or left hand to suit the screwrotation and the desired direction ofmaterial travel.

Conveyor Screw with Drive ShaftThe conveyor drive shaft connects theconveyor screw to the driving unit andtransmits rotary motion to the screw.Coupling bolts secure the drive shaft in theconveyor screw.

Conveyor Screw with DriveShaft, End Shaft and CouplingThe conveyor drive shaft, end shaft andcoupling support the conveyor screwsections and keep them in alignment. Theend shaft is located at the end oppositethe drive shaft. Couplings are used toconnect successive conveyor screw

sections when more than one section isnecessary to make up the total length ofconveyor. The shafts and coupling aresecured in the conveyor screws bycoupling bolts.

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component description

Trough Ends and Hangers

The trough ends support the conveyordrive and end shafts while the hangerssupport the conveyor couplings, therebymaintaining proper alignment andclearance between the conveyor screw and trough.

To provide additional protection for thedrive shaft and end shaft bearings, for oragainst the material being handled, trough

end seals are assembled between theflanged blocks and the trough end plates.

Conveyor Trough with InletOpening and Discharge SpoutThe trough is the enclosure in which thematerial is confined and guided in itsmovement. Trough end flanges preserve thecontour of the trough, facilitate assemblyof adjoining sections, and insure accuratealignment. Supporting feet at the troughjoints or saddles located between thejoints, support the intermediate troughsections.

Discharge spouts provide outlets for thematerial and direct its flow to bins orsucceeding equipment- With more than onedischarge point in a conveyor, selectivecontrol may be exercised by means of slidegates, made integral with the dischargespouts.

Trough covers with fasteners complete theconveyor enclosure. Material is fed into theconveyor through inlet openings in thecover.

Typical Screw ConveyorComplete With DriveA shaft mounted speed reducer makes asimple and compact drive combination. Thedrive consists of a standard shaft-mountedspeed reducer with adapter having a built-in, seal and mounted on a steel platetrough end. A welded steel adjustablemotor support bracket is rigidly mountedon the adapter and provides ampleclearance over the trough end for easytrough cover removal.



Helicoid Flight Conveyor ScrewsThe helicold flight conveyor screw is madeof a helix, formed from a flat steel bar orcoil strip and mounted on a pipe or shaft.The helix, formed by special rollingequipment to the required diameter, pitchand thickness, is a smooth, continuous one-piece flight.

By virtue of its one-piece construction, itpossesses superior strength. The absence oflaps, rivets or welds on the carrying face ofthe Flight promotes and maintainscleanliness and reduces wear. The rollingprocess effects a hardening and smoothingof the flight surface which increasesresistance to wear and reduces friction andpower consumption.

The flight is fastened to the pipe, or shaft,by intermittent or continuous welds andwith or without formed steel end lugs. The pipe, of a size carefully selected foradequate torsional strength and resistanceto excessive deflection, has internal collarsat each end. These collars are permanentlyinserted and have appropriate insidediameters to accept coupling or end shafts.

The assembled helicoid flight conveyorscrew is solidly constructed andexceptionally sturdy, and its inherentbalance permits operation at high speeds.Its distinctive characteristics contribute tomaximum efficiency, durability andeconomy.

Helicold flight conveyor screws areinterchangeable with sectional flightconveyor screws of the same diameter andshaft size.

Helicold flighting is made with regularpitch approximately equal to the diameter.It can also be furnished with other thanregular pitch and in a wide range ofdiameters, thicknesses and lengths to meetthe most exacting requirements.

For extremely heavy duty the flighting maybe continuously welded to the pipe or shafton one or both sides.

Consult Syntron Material Handling forinformation on special requirements.

Sectional Flight Conveyor ScrewsSectional flight conveyor screws are madeof individual flights, each blanked from aflat steel plate and formed into a helix. Theflights are butt welded together andfastened to the pipe or shaft by intermittentor continuous welds and with or withoutformed steel end lugs. Sectional flights areformed with regular pitch approximatelyequal to the diameter.

Sectional flight conveyor screws areinterchangeable with helicoid flightconveyor screws of the same diameter andshaft size.

Sectional flights afford flexibility in choiceof diameters, pitches and thicknesses. The

sectional flight conveyor screw is a sturdily constructed assembly, carefully designed torender efficient, economical and lastingservice.

When desired, sectional flights may be lap welded together, or flights may becontinuously welded to the pipe on one orboth sides, thus providing exceptionallyrugged construction for the most severeconveying applications.

Many variations of sectional flight conveyorscrews can be furnished to meet specificneeds. Some of these are listed on thefollowing pages.

Quik-Link Conveyor ScrewsThe Quik-Link conveyor screw Is designedfor easy removal from the conveyor trough.Each section of screw is provided with aQuik-Link key located at one end of thepipe. By removing this key, a conveyor

screw section and coupling with hanger canbe quickly and conveniently disassembledwithout disturbing other components. Quik-Link conveyor screws are available inboth the helicold flight and sectional flightconstruction.

Conveyor Screws

Helicoid flight conveyor screw

Sectional flight conveyor screw

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Cut flight conveyor screws have notches cut in theperiphery of either helicoid or sectional flights. Thesenotches supplement the conveying action with a moderatemixing action. They are used for light, fine, granular orflaky materials.

Ribbon flight conveyor screws consist of continuous helicalflighting formed from steel bar and secured to the pipe bysupporting lugs. They are used for conveying sticky, gummyor viscous substances, or where the material tends to stickto flighting at the pipe.

Conveyor screws with paddles have paddles spaced atintervals and set to partially oppose the forward flow, toprovide a moderate mixing or stirring of materials beingconveyed. Paddles are adjustable and may be set at anyangle to produce the desired degree of agitation. They areused for light or medium weight, fine, granular or flakymaterials.

Cut and folded flight conveyor screws provide foldedsegments which act as lifting vanes to produce a cascadingeffect. This promotes agitation and aeration, resulting inbetter mixing. They are used for light or medium weight,fine, granular or flaky materials.

Short pitch conveyor screws are of regular constructionexcept that the pitch of the flights is reduced. They arerecommended for use in inclined conveyors of 20 degreesslope and over, including vertical conveyors and areextensively use as feeder screws. They retard flushing ofmaterials of a fluid nature.

Cut flight conveyor screws with paddles have paddlesmounted at intervals and set to counteract the flow ofmaterials, considerably increases the agitation and mixingaction produced by the cut flights.

Paddle conveyor screws have formed steel blades mountedon rod shanks inserted through the pipe. Conveying actioncan be controlled by adjusting the angle of the paddles.They are used for mixing, blending or stirring dry orfluid materials.


Conveyor Screws


Tapering flight conveyor screwsare frequently used as feeder screws forhandling friable lumpy material from bins orhoppers and also to draw the materialuniformly from the entire length of the feedopening.

Stepped diameter conveyor screwsconsist of flights of different diameters, eachwith its regular pitch, mounted in tandem onone pipe or shaft. They are frequently used asfeeder screws, with the smaller diameterlocated under bins or hoppers to regulate theflow of material.

Stepped pitch conveyor screwsare screws with succeeding single or groups ofsectional flights increasing in pitch and areused as feeder screws to draw fine free-fIowingmaterials uniformly from the entire length ofthe feed opening.

Long pitch conveyor screwsare occasionally used as agitators for liquids orrapid conveying of very free-flowing materials.

Double fIight conveyor screwsof regular pitch promote a smooth gentle flowand discharge of certain materials.

Double flight short pitch conveyor screws assuremore accurate regulation of feed and flow inscrew feeders and effectively deter flushingaction of fluid materials.


Conveyor Screws

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Conveyor ScrewsRibbon Flight Conveyor Screwsconsist of sectional flights, butt weldedtogether to form a continuous helix. Flightsare secured to the pipe by supporting lugs.

Variations of diameter, pitch, flight width orthickness can be furnished. Also, thesescrews can be furnished with eithercontinuous or sectional flights, lap or buttwelded together.

Ribbon flight conveyor screws are thesolution to most conveying problemsencountered in the handling of sticky,gummy or viscous materials. The tendencyof materials of this nature to adhere andbuild up at the juncture of solid flight withthe pipe is overcome by the openconstruction of the ribbon flight. Rawsugar, molasses, asphalt, hot tar, sticky feedmixes, and similar products are typical ofthe many materials successfully handled byribbon flight conveyor screws.

Providing the periphery of ribbon flightswith a beveled edge improves operationand reduces power consumption whenhandling materials which tend to pack ortrowel between flights and trough.Consequently, beveled edge ribbon flightconveyor screws are usually subjected toextremely heavy loads, and construction isaccordingly heavy and rugged. The ribbonflights are supported on the pipe or shaftby steel lugs, generously proportioned toresist bending.

Where the material handled movesvirtually en masse, there is but very slightdifference in capacity between ribbon andsolid flight conveyor screws of the samesize. Mixing action without supplementarymeans of agitation is negligible.

Ribbon Flight Conveyor Screw withPaddlesTo provide moderate mixing or stirring ofmaterials being conveyed, paddles can befurnished, spaced at intervals and set topartially oppose the forward flow. Paddlesare adjustable and may be set at any angleto produce the desired degree of agitation.They are used for light or medium weight,fine, granular or flaky materials.

Multiple Ribbon Flight ConveyorScrewsThis type of screw consists of two or moreribbon flights of different diameters andopposite hand, mounted one with in theother on the same pipe or shaft by rigidsupporting lugs. Material is moved forwardby one flight and backward by the other,thereby including positive and thoroughmixing.

Abrasion-Resistant Conveyor Screws The particularly severe service encounteredwhen conveying abrasive materials hasprompted many attempts to overcomeexcessive wear on flights. Several successfulmethods have been developed.

Each of these methods offers specificadvantages depending on the nature of thematerial handled and the application. For acareful analysis and recommendation,consult Syntron Material Handling.

Hard surfacing by application of a specialcompound, by arc or torch, to the flightperiphery or face, or both, provides anexceptionally hard surface at the points ofgreatest wear.

For severe applications, conveyors with highalumina ceramic tile bonded to the flightperiphery or face are also available.

Corrosion-Resistant ConveyorScrewsCorrosion is manifested in so many differentways that no one choice of material willsuit all requirements. To withstand theeffects of corrosion encountered in manyfields of industry, conveyor screws arefabricated of stainless steel, Monel metal,aluminum, and other materials.

Galvanizing and other coating methodshave proved effective under mildlycorrosive conditions. Vulcanized or bondedrubber covering of the entire conveyor isfrequently satisfactory for resistance toextremely corrosive action.

Heat-Resistant Conveyor ScrewsConveyor screws for high temperatureapplications are made of many of theavailable heat-resistant alloys. Several ofthe stainless steels and other high-chromealloys are particularly suitable for thisservice.

Ribbon flight conveyor screw

Ribbon flight conveyor screw with paddles



Drive Shafts, End Shafts and Couplings

Conveyor end shaft

Conveyor drive shaft

Conveyor coupling

Quik-Link conveyor screw

Split flight coupling

The conveyor drive shaft delivers the drivingpower, and is therefore carefully designed ofquality steel of the proper characteristics toprovide adequate torque, bending and shearstrength, and with closely controlledtolerances for correct bearing clearances.

For conveyors of unusual length or forseverely heavy loads, alloy steels, heat-treated high carbon steels or 3-boltconnections, are used.

Jig-drilled coupling bolt holes and accuratelycut keyways contribute to ease of assembly.

The conveyor end shaft supports the lastsection of conveyor screw and is furnishedwith close tolerances for proper operation inend bearing. Coupling bolt holes are jigdrilled for interchangeability and ease ofassembly.

Conveyor couplings connect and spaceadjoining sections of conveyor screw andtransmit rotation.

Carefully selected steels, with accurate heat-treating or hard surfacing when required,insure ample strength and resistance to wearfor the kind of service specified.

For conveyors of unusual length or forseverely heavy loads, alloy steels, heat-treated high carbon steels or 3-boltconnections are used.

Close tolerances on diameters and jig-drilledcoupling bolt holes assure interchangeabilityand ease of assembly.

Quik-Link conveyor screws provide an easymeans for the quick removal of a conveyorscrew section and coupling with hangerwithout disturbing other components. Regularcouplings are used with these screws.

Split flight couplings permit installing orremoving individual conveyor screws withoutdisturbing adjoining sections. With split flightcouplings installed on both sides of eachhanger, conveyor screws can be removedwithout disturbing the hangers. The Link-Belt® split flight coupling is sturdilyconstructed and jig-drilled for coupling bolts.


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HangersNo. 216 hangers have formed steel box frames of superior strength andrigidity and are excellent for heavy service. They are mounted with inthe conveyor trough. Mounting holes are slotted parallel with theconveyor to permit adjustment and alignment. These hangers arenormally furnished with hard iron, babbitted, bronze, oil impregnatedwood or molded fabric bearings, but can also be furnished with specialbearings.

No. 216F hangers are similar in construction to No. 216 hangers exceptthey are designed to mount in, flared trough.

No. 220 hangers are similar in construction to No. 226 hangers, exceptthey are mounted on top of the trough flanges. Mounting holes areslotted parallel with the conveyor to provide adjustment and alignment.These hangers are normally furnished with hard iron, babbitted, bronze,oil impregnated wood or molded fabric bearings, but can also befurnished with special bearings.

No. 226 hangers have a rigid, formed-steel box frame with clearance forpassage of material in large volume. They are mounted within theconveyor trough. Mounting holes are slotted parallel with the conveyorto permit adjustment and alignment. These hangers are normallyfurnished with hard iron, babbitted, bronze, oil impregnated wood ormolded fabric bearings, but can also be furnished with special bearings.

No. 270 ball bearing hangers have self-aligning ball bearings. The frameis a box-member top-bar with a pipe stem support for the bearing. Thebearing is factory adjusted for the proper length from the top-bar andlocked with a sealant and a lock nut. The frame is designed for mountinginside the trough and slotted mounting holes parallel to the conveyorpermit adjustment and alignment.

No. 316 hangers have formed steel frames of superior strength andrigidity and are excellent for heavy service. They are mounted within theconveyor trough, are self-adjusting and will accommodate operatingvariations which may exist between the conveyor screw and trough.Mounting holes are slotted parallel with the conveyor to permitadjustment and alignment. These hangers are normally furnished withhard iron, babbitted, bronze, oil impregnated wood or molded fabricbearings, but can also be furnished with special bearings.

No. 326 hangers have a rigid, formed steel frame with clearance forpassage of material in large volume. They are mounted within theconveyor trough, are self-adjusting and will accommodate operatingvariations which may exist between the conveyor screw and the trough.Mounting holes are slotted parallel with the conveyor to permitadjustment and alignment. These hangers are normally furnished withhard iron, babbitted, bronze, oil impregnated wood or molded fabricbearings, but can also be furnished with special bearings.

No. 216 hangers

No. 216F hangers

No. 220 hangers

No. 226 hangers

No. 270 ball bearinghangers

No. 316 hangers

No. 326 hangers



Trough End Plates

Trough end with feetTrough end without feet

Tubular trough end Flared trough end

Trough end with doubleroller bearing

Trough end plates for either U-trough or flared trough are madeof heavy gauge steel plate with the top flanged to support thetrough cover. They are furnished with or without supporting feet.

Trough end plates can be made of stainless steel or nonferrousmetals for corrosive or high temperature applications. They canalso be furnished with protective coatings, such as galvanizing.

They may be equipped with either sleeve, bolt, or roller bearingflange blocks, or with the addition of a mounting shelf, pillowblock bearings.

Drive Shaft Trough Ends are of the double ball bearing anddouble roller bearing types. Each consists of a rigid shaft,operating in double bearings and designed to accommodate bothradial and thrust loads. The radial or overhung load is usually achain drive connected to a power source. Since the bearings willalso accept thrust loads in either direction, the need for auxiliarythrusts is eliminated.

Drive shaft trough ends with double ball bearings consist ofdouble ball bearing flanged blocks rigidly attached to heavysteel plate trough ends for either U-troughs or flared troughs.The gray iron housings are of one-piece construction and areprecision machined for accurate alignment. Effective seals areprovided in the flanged blocks to exclude dirt and moisture andretain lubricant.

Drive shaft trough ends with double roller bearings consist ofheavy duty double roller bearing flanged blocks mounted bymeans of machined surfaces into extra heavy steel plate troughends for either U-troughs or flared troughs. The gray ironhousings are accurately machined and fitted with roller bearingsof high radial and thrust capacity. The blocks have effective sealsand are arranged for easy lubrication.

Countershaft trough ends are used on screw conveyors whereapplication of right angle drives is necessary due to spacelimitations, interference of adjoining equipment or for betterservice and maintenance accessibility.

Application of countershaft trough ends permits driveinstallations alongside, above or below the conveyor and permitsusing horizontal drives for inclined conveyors. A common drivefor two conveyors intersecting at right angles, or a battery ofparallel conveyors driven from a common source, can be readilyarranged.

15


Seal Glands, Trough End Seals andTrough End Bearings

Seal glands and trough end seals are usedto provide additional bearing protectionagainst dust or fumes from within the troughand prevent entrance, along the shaft, of dirt,moisture or lubricant.

The trough end seal housings are made ofgray iron and are designed for assemblybetween babbitted, bronze or ball bearingflanged blocks and the trough end plates.They can be provided with lip-type sealsfor effective protection for or against thematerials being handled, with felt sealswhen handling dusty materials, or withwaste packing when handling abrasivematerials.

Seal glands consist of gray iron, splitflanges into which packing materials arecompressed against machined steel collars.They are used internally on all trough endsexcept the outboard bearing type on whichthey are externally mounted. These sealsprovide maximum protection for or againstthe materials being handled.

Trough end bearingsBabbitted and bronze bearing flangedblocks are made with one-piece gray ironhousings. Babbitted bearing blocks are forgeneral use where loads and speeds aremoderate. Bronze bearing blocks are usedwhere heavy bearing pressures, impact loadsor temperature conditions are involved.

Ball bearing flanged blocks consist ofsingle row, deep groove, self-aligning ballbearings, which are effectively sealed,mounted in one-piece gray iron housings.Spring locking collars with two set screwshold the bearings firmly on the shafts.

Trough end seal

Internal mountingseal gland

Ball bearingFlanged block



Troughs

The trough not only confines and guides the flow of material, but

also serves as the housing in which all operating components are

supported and held together in their proper functional relationship.

Accuracy in manufacturing and inherent strength to maintain this

accuracy are therefore, essential.

Link-Belt® designs, and manufacturing methods, are constantly

being improved to provide these qualities to the fullest extent

while at the same time affecting economies in weight and space

requirements.

Flanged trough - By forming the top flanges integrally with the

trough sides from a single steel sheet, adequate strength and

rigidity is obtained without superfluous bulk or weight. Steel

connecting flanges, securely welded at each end in special welding

fixtures to assure square, true ends, facilitate assembly, insure

proper alignment and preserve the contour of the trough.

Angle Flanged trough - This trough is identical in construction tothe flanged trough, except that top flanges are obtained by securely

welding structural steel angles to the trough.

Flared trough - This trough is of conventional construction exceptthat trough sides are flared outward to afford a wider top opening.

This results in improved feed and conveying action with sticky

materials or materials which are not entirely free flowing. It is

customarily used with ribbon flight conveyor screws.

Corrosive or high temperature applications may require the specific

qualities that make stainless steel and non-ferrous metals well

adapted to these services. In general, any type of trough that can be

fabricated of mild steel can also be made of stainless steel or

aluminum, brass, bronze, copper, Monel metal, nickel, etc. For

resistance to corrosion there are numerous protective coatings that

are applied to steel troughs and covers. Galvanizing, tinning,

chrome plating, etc., are all effective for certain applications.

Vulcanized or bonded rubber coatings resist abrasion and corrosion.

Flanged trough

Angle flanged trough

Flared trough

17


Troughs

Drop bottom troughs are equipped with a drop bottom usuallyhinged, held in place by spring clamps of various types for readyaccess to trough interior, conveyor screws and hangers.

This design facilitates quick, thorough, and frequent cleaning of thetrough, screw and other parts and is particularly useful to combatinfestation and promote sanitation.

Channel side troughs are made with separate detachable troughbottoms, bolted or clamped to formed or rolled steel channels. Thechannels may be of any reasonable length to span widely spacedsupports. Trough bottoms are made in lengths up to 12 feet.

This trough is occasionally selected for ease of replacement oftrough bottoms subject to unusually severe abrasive or corrosivewear.

Trough SupportSupporting feet are of formed steel for use with end flanges andprovide a convenient means of aligning and supporting conveyorsfrom floors, and supporting structures.

Supporting saddles are used when locatio n of support points doesnot coincide with the spacing of joint flanges or when troughs withbutt strapped connections are used.

Support saddle

Support feet

Channel side trough

Drop bottom trough



Trough Covers

Covers are used for protection of operating personnel, dust controlor protection for or against the material being handled. Whenrequired, protective seals can be furnished between the covers and troughs. Covers are made in three general types: plain, semi-flanged and flanged.

Plain covers consist of flat steel sheets and can be furnished withspring clamps, screw clamps or bolts.

Semiflanged covers are flanged 30 degrees along the sides andprovided with spring clamps attached to the top side of the coverThese covers can also be furnished with screw clamps or bolts.

Flanged covers have right angle flanges along the sides to providea stiffer cover for more convenient handling. They are normallyattached to the trough with screw clamps or bolts.

Hip Roof covers are peaked to form a longitudinal ridge. They arenormally furnished for use in outdoor applications because of theirability to shed water.

Shrouds are used in U-trough sections of screw feeders todecrease the clearance between the cover and feeder screw toobtain proper feed regulation.

Plain Cover

Semiflanged Cover

Flanged Cover

Shroud

19


Trough Discharge Spouts and Gates

Discharge spouts and gates afford the means for discharging materialfrom the trough and for connection to succeeding equipment to whichmaterial is delivered. Gates provide for selective control of multiplespouts.

All spouts and gates are of welded steel construction with connectingflanges punched with accurately spaced holes for interchangeabilityand ease of assembly.

Spouts and gates can be fabricated of stainless steel and nonferrousmetals. Spouts of special design can be furnished to accommodateunusual conditions.

Plain discharge openings are cut in the bottom of the trough at thedesired location to provide free discharge of material. They are used fordelivering to open or closed storage or similar applications.

Discharge Spouts are welded in place when furnished with a completeconveyor. They are furnished in thicknesses proportioned for the sizeand thickness of trough.

Flush end discharge spouts are furnished welded in place on flanged orangle flanged trough. They are furnished in thicknesses proportionedfor the size and thickness of the trough.

Hand Slide Gates are made to attach to discharge spouts and can beoperated from any one of the four sides, provided there is sufficientclearance for the gate in its open position.

Rack and Pinion slide gates have cut tooth racks welded to the side-plates and actuated by cut tooth pinions mounted on pinion shaftsoperated by hand wheels or chain wheels. These are available witheither flat slide plates or curved slide plates.

Air Operated gates are high quality units designed for low-frictionperformance in applications requiring frequent gate operation. Thesegates are built to accept a flange-faced air cylinder and have a rollermounted slide plate operating in a formed steel housing. The cylindercan be furnished with the gate or supplied by the user for fieldinstallation. No air piping or controls are provided with these gates.

Slide gates, either hand or rack and pinion operated, may be installed inpractically all applications for operation either parallel or at rightangles to take conveyor axis. Rack and pinion operated gates may befurnished with chain wheels and chains for remote control. Pinionshafts may be extended to accommodate various operatingarrangements.

Plain dischargeopening

Discharge Spout

Flush end discharge spout

Rack and pinioncurved slide gate

Rack and pinionflat slide gate


Technical Data

The Link-Belt® screw conveyor layout,engineering and component selectioninformation in this section is provided to assistyou in the selection of the proper conveyorcomponents for your particular materialhandling requirement. It has been compiledduring the many years of experience designingnumerous and varied screw conveyorinstallations, and includes detailed informationon all Link-Belt® standard screw conveyorcomponents and accessories.

The data and formulas presented permit easyselection of the necessary components forhandling materials under normal operatingconditions by horizontal screw conveyors andscrew feeders.

Where unusual applications or severe operatingconditions are a factor or where there is doubtconcerning the correct selection, contactSyntron Material Handling, Tupelo, MS to assistyou with additional information.

CAUTION: Link-Belt® Screw Conveyors andcomponents must be installed, operated andmaintained in accordance with SyntronMaterial Handling Service Instructions.Failure to follow these instructions can resultin serious personal injury, property damage orboth.

Service Instructions are available online atwww.syntronmh.com

layout information

21

Layout Data Use the conveyor layout on page 22 whenselecting components. This layout is based onusing regular, or odd length screws and troughsat the tail end of the conveyor and regularlength screws and troughs for the drive andintermediate sections. Hangers are located atthe trough joints.

The drive shafts that provide a nominalclearance between the ends of the conveyorscrews and the trough end are designated asType A shafts.

The drive and tall end shafts that are longenough to permit a clearance between theends of the conveyor screws and the troughends equal to approximately one-half thehanger bearing length are designated as Type B shafts.

Conveyor screws • Regular and half lengthconveyor screws, listed in Table 1 on page 22,should be used to obtain the required totalscrew length. The face of the screw, whichmoves the material being conveyed, is free oflugs for unimpeded flow. To maintain thiscondition, do not reverse rotation withoutturning the conveyor screws end for end, orconversely, do not turn the conveyor screwsend for end without reversing rotation.Conveyor screws for reversible operation canbe furnished for specific requirements.Flighting should be omitted over the lastdischarge opening. Flight ends at hangerlocations should be set opposite to each otherfor continuous flow of material across thehanger space.

Selection of hand of screw • Refer to Figure Afor selection of right or left hand conveyorscrews. This drawing indicates the hand ofconveyor screw to use when direction ofrotation and material travel are known. If theedge of the flight on the near side of theconveyor screw slopes downward to the right,the conveyor screw is right hand, and if itslopes downward to the left, the conveyorscrew is left hand.

Figure A


layout information

Screw Conveyors Screw conveyors are made with eitherhelicoid or sectional flighting of variousthicknesses in a wide range of sizes in bothright-hand and left-hand assemblies. The

conveyor screws and troughs are made inregular lengths, but can also be furnished inodd lengths to suit requirements.

23

layout information

Hangers - Hangers are located betweenconveyor screw sections. No. 216, 220, 226,270, 316 and 326 hangers are located attrough joints in Figure B, page 22. Allhangers should clear inlet and dischargeopenings.

Trough ends - The drive shaft or end shaft,depending on the direction of materialtravel, should have a thrust bearing tomaintain clearance between the conveyorscrews and hangers, and the conveyorscrews and trough ends. This preventsexcessive wear of operating parts andreduces power consumption. The preferredlocation for the thrust bearing is at theend of the conveyor, because the conveyorpipes and couplings will then be in tensionduring operation.

Drive shaft trough ends of either thedouble ball bearing or double rollerbearing type will accommodate radialloads and thrust loads in either direction.The radial or overhung load usuallyconsists of a shaft-mounted speed reducerdrive or a chain drive connected to apower source.

Plain trough ends require auxiliary endthrust provision. Depending upon thedirection of the thrust, either the drive orend shaft should have a bronze thrustbearing.

Seals - Trough end seals are used foradditional protection for or against thematerial being handled, or to protect and

preserve the trough end bearings andshafts when handling abrasive or corrosivematerials.

Troughs - Regular and half length troughs,listed in Table 1, page 22, should be usedto obtain the required total trough length.Whenever possible, supporting feet shouldbe used at the trough joints, otherwise, usesaddles as needed. Supporting feet locatedat the ends of the conveyor will allowremoval of the trough ends withoutdisturbing trough alignment.

Covers - Covers are made with jointslocated at the hangers. Protective sealsbetween the troughs and covers are easilyapplied when No. 216, 226, 270, 316, and326 hangers are used. Inlet openings in thecovers should clear hangers.

Drives - Drives should preferably belocated at the discharge end of theconveyor in order to keep the conveyorscrews and couplings in tension.

Assembly Bolts - Table 2 provides a guideto the quantities and sizes of boltsrequired to assemble a screw conveyor.Bolts are listed for each type of hanger, foreach shroud, for each trough joint ortrough end, and for 10 foot and 12 footlong sections of bolted cover.

Assembly bolts for No. 316 and No. 326hangers are furnished with hangerassemblies.

Screw ConveyorsMany bulk materials are handled easilyand efficiently in screw conveyors.However, to insure the best possibleselection of components, it isrecommended that consideration be givento the physical, chemical and handlingcharacteristics of all materials.

The essential characteristics include size,flowability and abrasiveness of thematerials. Other characteristics, such ascontamination, corrosiveness,degradability, fluffiness, etc., may influencethe handling and should be givenconsideration. Consideration should alsobe given to materials which may assumedifferent characteristics under certainconditions of processing, atmosphere, ageor storage. Many of the more commonmaterials are classified in the MaterialCharacteristics Table 4, pages 26 thru 34,and are given as a guide in selecting theproper components. Materials notappearing in the list can be classified bycomparison with similar materials or byestablishing a classification using theMaterial Classification Code Chart Table 3,page 25.

The delivery of material to a screwconveyor must be at a controlled and fairlyuniform rate.

(1) Four bolts(2) Six bolts(3) Eight bolts

(4) Ten bolts(5) Twelve bolts(6) Fourteen bolts

(7) Sixteen bolts(8) Eighteen bolts(9) Twenty bolts

(10) Eight bolts for U-Trough & ten bolts for Flared Trough


layout information

Special applications

Occasionally the characteristics of the materialbeing handled are such that other thanconventional or regular equipment is requiredfor the purpose, such as:

1. When the materials are extremely hot, thescrews and troughs may be made of hightemperature alloy metals.

2. If the materials are sticky or viscous, ribbon flight conveyor screws may be the choice. Furthermore, special coatings applied to the screws and troughs may also aid the flow of thematerial.

3. Extremely abrasive materials may require screws and troughs made of abrasion resistant metals or the screws may be provided with hard surfaced flights.

4. When the materials are corrosive, it may be desirable to make the conveyor screws and troughs of stainless steel, Monel metal, nickel, aluminum, etc.

5. If the materials are to be mixed or aerated, a conveyor screw of ribbon flights or cut flights, or one of these combined with paddles may be used to obtain the desired results.

6. Materials which are to be heated or cooled may require jacketed troughs arranged for circulating heating or cooling media.

7. Contaminable materials may require self-lubricated bearings and screw and trough construction which will eliminate pockets, cracks, etc. Such screws and troughs will prevent the accumulation of the material and facilitate easy cleaning.

How to select a horizontal screwconveyor

Consider the following factors whenselecting a horizontal screw conveyor:

Kind and character of material beinghandled, such as: size, flowability,abrasiveness, etc.

Weight of material in pounds percubic foot.

Maximum rate at which material ishandled in cubic feet per hour.

Maximum size of lumps in inches,average size of material andpercentage of lumps in total volume.

Length of conveyor in feet.

25

material classification

Preface to Material Table

The Material Characteristics Table 4 lists awide range of bulk materials that can behandled in screw conveyors. The tableshows the first column the range of densitythat can be experienced in handling thatmaterial. The "as conveyed" density is notspecifically shown but is often assumed tobe at or near the minimum.

The next column shows the material codenumber. This consists of the averagedensity, the usual size designation, theflowability number, the abrasive numberfollowed by those material characteristicswhich are termed conveyability hazards.

The component series column refers toselection of conveyor components as usedin Tables 9, 10, 11, & 12 on pages 39 and 40.

A very fine 100 mesh material with anaverage density of 50 lbs. per cubic footthat has average flowability and ismoderately abrasive would have a materialcode 50A10036. If this material was verydusty and mildly corrosive the numberwould be 50 A10036LT.

The Material Factor is used in thehorsepower formula to determine thehorsepower to operate a horizontal screwconveyor. The calculation of horsepower isdescribed on page 41.

The Material Characteristics Table is aguide only. The material code, and thematerial factor Fm are based onexperience. A specific material sample mayhave properties that vary from those shownin the table. The range of densities willalso vary depending on moisture content aswell as its source.



(1)Consult Syntron Material Handling

27






29





31





33





35

engineering information

Selection of Conveyor Size and SpeedIn order to determine the size and speedof a screw conveyor, It is necessary firstto establish the material code number. Itwill be seen from what follows that thiscode number controls the cross-sectionalloading that should be used.

The various cross-sectional loadingsshown in the Screw Conveyor CapacityTable 5 are for use with the standardscrew conveyor components indicated inthe Component Group Selection GuideTable 8 on page 38, and are for the usualscrew conveyor applications. The usualscrew conveyor applications may bedefined as those in industrial use wherethe conveying operation is controlled withvolumetric feeders and where the materialis uniformly fed into the conveyor housingand discharged from it.

Check lump size limitations beforechoosing conveyor diameter. See Table 7,page 37.

Capacity TableThe Capacity Table 5 gives the capacitiesin cubic feet per hour at one revolutionper minute for various sized screwconveyors for four cross-sectional loadingsand for various classes of materials asdelineated by code numbers. Also shownare capacities in cubic feet per hour at themaximum recommended revolutions perminute.

Conveyor SpeedFor screw conveyors with screws havingregular helical flights all of standard pitch,the conveyor speed may be calculated bythe formula:

Required capacity cubic feet per hour

N = Cubic feet per hour at 1 revolution per minute

where

revolutions per minute of screw,N = but not greater than the

maximum recommended speed.

For the calculation of conveyor speedswhere special types of screws are used,such as short pitch screws, cut flights, cutand folded flights and ribbon flights, anequivalent required capacity must be used,based on factors in Table 6, page 36.

Factor CF, relates to the pitch of thescrew. Factor CF2 relates to the type ofthe flight. Factor CF3 relates to the use

of mixing paddles within the flightpitches.

The equivalent capacity then is found bymultiplying the required capacity by oneor more of the capacity factors that areinvolved. See Table 6, page 36, for capacityfactors.

CE = Equiv. Capacity = Required Capacity (CF1) (CF2) (CF3)cubic feet per hour cubic feet per hour

*For capacities of inclined screw conveyors, contact Syntron Material Handling.


Lump Size LimitationsThe size of a screw conveyor not onlydepends on the capacity required, but alsoon the size and proportion of lumps in thematerial to be handled. The size of a lumpis the maximum dimension it has. A closerdefinition of the lump size would be thediameter of a ring thru which the lumpwould pass. However, if a lump has onedimension much longer than its transversecross-section, the long dimension or lengthwould determine the lump size.

The character of the lump also Is involved,Some materials have hard lumps that won'tbreak up in transit through a screwconveyor. In that case provision must bemade to handle these lumps. Othermaterials may have lumps that are fairlyhard, but degradable in transit through thescrew conveyor, thus really reducing thelump size to be handled. Still othermaterials have lumps that are easily brokenin a screw conveyor and lumps of thesematerials impose no limitations.

Three classes of lump sizes apply asfollows:

Class 1 A mixture of lumpsand fines in which notmore than 10% are lumps ranging frommaximum size to one half of the maximum;and 90% are lumps smaller than one halfof the maximum size.

Class 2 A mixture of lumps and fines in which notmore than 25%, are lumps ranging fromthe maximum size to one half of themaximum; and 75% are lumps smallerthan one half of the maximum size.

Class 3 A mixture of lumps only in which 95% ormore are lumps ranging from maximumsize to one half of the maximum size; and5% or less are lumps less than one tenthof the maximum size.

Table 7, page 37 shows the recommendedmaximum lump size for each customaryscrew diameter and the three lumpclasses. The ratio, R, is included to showthe average factor used for the normalscrew diameters which then may be usedas a guide for special screw sizes andconstructions.

For example:

Radial Clearance, inchesRatio, R =

Lump Size, inches

This ratio applies to such unusual cases asscrews 16 inches diameter mounted on 2inch solid shafts; or 12 inch diameterscrews mounted on 6 inch diameter pipes(the large pipe serving to reducedeflection of the screw).

The allowable size of a lump in a screwconveyor Is a function of the radialclearance between the outside diameterof the central pipe and the radius of theinside of the screw trough, as well as theproportion of lumps in the mix. Thefollowing illustration illustrates thisrelationship.



To illustrate the choice of screw size from Table 7, say the material is ice with MaterialCharacteristic code number D15, 35 to 45 lbs.per cubic foot and with size distribution asfollows:

4"x2," 9% 2"x1," 41% 1"x3/8," 22% minus 3/8," 28%.

This lump size distribution falls under Class1. From Table 7, the ratio R is 1.75 and theradial clearance (4) (1.75) or 7 inches. Thiscalls for an 18 inch diameter screw.

Component Groups To facilitate the selection of properspecifications for a screw conveyor for aparticular duty, screw conveyors are brokendown into three Component Groups. Thesegroups relate both to the MaterialClassification Code and also to screw, pipesize, type of bearings and trough thickness.

If the material to be conveyed is not listedin Table 4, pages 26 thru 34, then itsClassification code may be determinedfrom Table 3, page 25.

Table 8 is a guide to the proper selectionof the appropriate Component Group. Itwill be observed that in addition to theflow characteristics of a material,consideration must be given to thematerial size, its abrasiveness and itscorrosiveness as these determineconstruction details.

For example, if the material has suitableflow characteristics, is of a classificationCode Size B, has an abrasive number of 5and is non-corrosive, the Component GroupNumber is 1. If babbitted or bronzebearings, 1A; or for balI bearings, 1C. It willbe noted that if the material is at allcorrosive, ball bearings are notrecommended.

Having made the Component Groupselection, refer to Tables 9, 10 and 11, pages39 and 40, which give the specifications ofthe various sizes of conveyor screws. Thetabulated screw numbers in this table referto CEMA Standard No. 300 on ScrewConveyors. This standard gives completedata on the screws such as the length ofstandard sections, minimum edge thicknessof screw flight, bushing data, bolt size, boltspacing, etc.

37



(1) For very corrosive conditions (codes 6S or 7S) lighter gauge special anti-corrosionmaterials may be used.

(2) Ball bearings are not usually recommended for conveyors handling materials partly orwholly finely ground. (Code A)

(3) Any abrasive material which is flammable, corrosive, or which may contain explosive dust,

consult manufacturer for bearingrecommendations,

Conveyor screw speeds must beconsidered when using hard ironbearings on hardened coupling shafts inorder to minimize wear and to reduce thesquealing noise of dry metal on metal. Thefollowing formula gives maximumrecommended operating speed:

120N = Shaft diameter in inches

where

N = Maximum operating rpm of screwFor bearing types A, B and C listed above,the shafting used for the couplings is AISIC1018 standard cold rolled steel or equal.

For hard iron bearings, the shafting forthe couplings is usually medium carbonsteel AISI 1045 and surface hardened.Suitably hardened alloy shafting also may

39


Component Groups




41

Horsepower Requirements, Horizontal Screw ConveyorsThe horsepower required to operate ahorizontal screw conveyor is based onproper installation, uniform and regularfeed rate to the conveyor and other designcriteria as determined in this catalog.

The following factors determine thehorsepower requirement of a screwconveyor operating under the foregoingconditions.

CE Equivalent capacity in cubic feet per hour.

e Drive efficiency.Fb Hanger bearing factor. See

Table13.Fd Conveyor diameter factor See

Table 14, page 42.Fm Material factor. See Table 4,

pages 26 thru 34.Fo Overload factor See Figure D,

Page 42.L Total length of conveyor, feet.N Operating speed, rpm.W Apparent density of the

material AS CONVEYED, lbs. per cubic foot. See Table 4, page 26 thru 34.

The horsepower requirement is the total ofthe horsepower to overcome conveyorfriction (HPf) and the horsepower to transportthe material at the specified rate (HPm)multiplied by the overload factor Fo anddivided by the total drive efficiency e, or:

LN Fd FbHPf = 1,000,000

CELWFmHPm = 1,000,000

(HPf + HPm) FoMotor HP = _______________e

or use Figure E, page 42, where HPt = (HPf + H Pm).

It is generally accepted practice that allpower transmitting elements of a screwconveyor be sized and selected to handlesafely the full load motor torque. If, forexample, a screw conveyor requires 3.5horsepower as determined by the

horsepower formula, a 5 hp motor must beused and all power transmitting elementsmust be capable of safely handling the full 5 horsepower.

ProblemMaterial . . . . . . . . . . . . . . Vermiculate OreWeight . . . . . . . . . . . . . . . 75-85 1 lbs/ft3

Capacity . . . . . . . . . . . . . . 1200 ft3/hrMax. Lump . . . . . . . . . . . . 1"Length of Conveyor . . . . 31'-0"

Refer to Table 4, pages 26 thru 34. Thematerial class is 80D336. The componentseries is 2D and the material factor Fm is 1.0

Refer to Table 5, page 35, and select a 16"diameter conveyor @ 30% loading capableof 1400 ft3/hr at a max. speed of 45 rpm.Capacity of unit is 31.2 ft3/hr at 1 rpm.

120N = ____ = 40 rpm; 39 rpm satisfactory3

LN Fd Fb 31 x 39 x 106 x 4.4HPf = ___________ = = 0.561,000,000 1,000,000

CE LW Fm 1200 x 31 x 85 x 1.0HPm = ___________= = 3.161,000,000 1,000,000

(HPf + HPm)x Fo (0.56 + 3.16)1.21MHP = _________________ = = 5.28 use 71/2e .85

or use Figure E, page 42, HP1 = 0.56 +3.16 = 3.72 Use 7 1/2 hp.

HP x 63,025 7.5 x 63,025Torque = ______________ T = ______________ T = 12,120 in. lb.N 39

Table 15, page 43, indicates a 2-bolt connection is rated 16,400 in. lb.

=

==

=

=

=

===

1200Required speed = ______31.2 =38.46

call 39 rpm.

Table 8, page 38, indicates a hard ironhanger bearing.

Component series 2D indicates HeavyService Table 10, page 39.

16H614 helicoid screw flight - 3"diameter shaft 3/16 "trough and 14 ga.cover.

Max. speed for 3" diameter shaft usinghard iron bearings.



Factor F0 and A Drive Efficiency of 85% Are included.

Figure E

43


Torsional Ratings of Conveyor Screw Parts

Screw conveyors are limited in overalllength by the amount of torque that can besafely transmitted through the pipes andcouplings.

Table 15 combines the various torsionalratings of bolts, couplings and pipes so thatit is easy to compare the torsional ratingsof all the stressed parts of standardconveyor screws. The table conforms to theCEMA Screw Conveyor Standard No. 300.The torsional values are confined to thesizes listed in that standard.

The lowest torsional rating figure for anygiven size of coupling will be the one thatgoverns how much horsepower may besafely transmitted. For example, usingstandard unhardened two bolt couplingshafts, the limiting torsional length of eachpart is indicated in Table 15.

Thus it can be seen that the shaft itself isthe limiting factor on 1," 11/2," and 2"couplings. The bolts in shear are thelimiting factors on the 27/16," coupling andon the 3" coupling used in conjunction with4" pipe. The bolts in bearing are the limitingfactors for the 3" coupling used inconjunction with 31/2" pipe, and for the 3/16"coupling.

63025 x HPTorque, TQ = _____________

rpm

If coupling bolt shear is the limitingtorsional rating, high strength bolts may besubstituted. When using high strength boltsthe limiting factor will, in all cases, beeither the coupling shaft or the bearingvalue, and both must be checked.

Screw Conveyor End ThrustMost screw conveyors can be designed withlittle thought given to thrust as the thrustforce in an ordinary screw conveyor ismoderate and commonly used screwconveyor drives will accommodate thrust ineither direction. However, in screw feederswith long inlet openings and in screws usedto compress material (either by design or byaccident when discharge openings areplugged) thrust forces can be very severe.Severe thrust forces can strip the flightsfrom the pipe, stall the drive, result insheared coupling bolts or fracturedcouplings and shaft.

The direction of thrust in a screw conveyoror feeder is opposite to the direction offlow of the product. It is preferred toaccommodate the thrust at the dischargeend as this results in the line of screws andcouplings being in tension.

The most common drives in use today arethe so-called screw conveyor drives thatare adaptations of shaft mounted reducers.These include drive shafts that are securedin the reducer so as to take thrust in eitherdirection and transfer the thrust force toone of the hollow shaft bearings of thereducer.



CONVEYOR SCREW DEFLECTIONDeflections of conveyor screws of standardlengths not usually a problem. However, iflonger than standard sections of screw areto be used, without intermediate hangerbearings, care should be taken to preventthe screw flights from contacting the troughbecause of excessive deflection. Thenomograph on page 45 indicates thedeflection of standard helicold conveyorscrew sections on schedule 40 and schedule80 pipe, for various lengths of screwsections. The schedule 80 pipe may beneeded for large torques.

Applications of screw conveyors in whichthe deflection of the screw exceeds 0.25inches should be referred to the screwconveyor manufacturer forrecommendations. (In some applications, a deflection of even less than 0.25 inchescould be critical and should be referred tothe manufacturer.) Very often the problemcan be solved by using a conveyor screwsection with a larger diameter pipe. It willbe noted from the nomograph that the useof a schedule 80 pipe reduces the deflectionvery little, hence it isn't practical to reducedeflections by using heavier pipe. Largerdiameter pipe should be used.

Example NO. 1Determine the deflection of a 12H512conveyor screw section mounted on aschedule 40 pipe, with an overallunsupported length of 18 feet. From thenomographic chart, Figure 3.6, the deflectionis greater than 0.25 inch, and thereforeindicates that the problem should bereferred to the screw conveyor manufacturerfor solution.

When the flights of the screw are mountedon something other than Schedule 40 orSchedule 80 steel pipe, such as mechanicallydrawn tubing or solid shafting or steel orother metals, the deflection at mid span maybe calculated from the following formula:

5 WL3

s= _______384 El

where:

s deflection at mid span, inchesW total weight of screw, lbs.L Length of screw between

bearings, inchesE modulus of elasticity for steelI moment of inertia of hollow or

solid shaft section.

Example NO. 2 Determine deflection of a 12H614conveyor screw 20 ft. long. According tomanufacturers' catalogues it has a weightof 228 lbs. for an 11’-9’’ long section andhas helicoid flighting mounted on 31/2"schedule 40 iron pipe size.

228W = x 20 = 388 lbs.11.75

L = 20 X 12 - 240", L3 = 13.8 X 106

E = 30 X 106I = 4.79 (31/2" schedule 40 pipe)

(5) (388) (13-8) (10)6s = _______________________ = 0.48(384) (30) (10)6 (4.79)

The 0.48 inch deflection is greater thanthe 0.25 inch normally allowabledeflection. Therefore, a larger diameterpipe or other section having a highermoment of inertia may be tried.

The nomograph on Page 45 will solvesome examples of conveyors longer thanusual or longer than standard lengths.

===

==

45



Screw FeedersThis section relates to screw feeders thatare used to control the rate of flow of abulk material from a bin or hopper. This islimited to the handling of bulk free flowingmaterials less than 1/8" in size and whichare classified as abrasive 5 or 6 as shownin Table 3, page 25.

In screw feeders, the inlet portion of thetrough is made to be flooded with thematerial and by means of a shroud in thetrough, or by the use of a tubular trough,only a controlled amount is carried to thedischarge.

The screws in the feeder are arranged inseveral different ways, depending uponcircumstances. For relatively small inletopenings, the screw often has a standarddiameter and pitch. Frequently, however thescrew is tapered in diameter with itssmallest diameter at the extreme feed end.Screws also may be made with a constantstandard diameter and a variable pitch, thepitch growing larger from the extreme feedend. The purpose of the tapered diameter orvariable pitch screw is to obtain an evenflow from all areas of the feed opening. Thecapacity of tapered screws or variable pitchscrews is determined by the diameter andpitch at the downstream end of the inletopening.

Several factors should be establishedbefore selecting a screw feeder, thesebeing:

A. Kind and character of material being handled.

B. Density of material as conveyed, lbs/ft3.

C. Maximum rate at which material is to behandled, ft3/hr.

D. Size consist or screen size analysis.

E. Overall length of feeder, or feeder withextended conveyor, feet.

F. Width and length of inlet opening.

Single screw feeders are most commonlyused. However, if the inlet opening is verywide, multiple screw feeders are morepractical.

Single Screw FeedersThe single screw feeder may be a separateunit, or it may be extended by sections ofnormal screw conveyor to any practicallength. The procedure by which to choosea single screw feeder is as follows:

Refer to Material Classification Code, Table 3, page 25, and the MaterialCharacteristics, Table 4, pages 26 thru 34.Determine the material code class anddensity from Table 4.

Capacity and SpeedFrom Table 16, under the column captioned at maximum rpm, find thecapacity which equals or exceeds thedesired feeder capacity. Then find fromthat the feeder diameter and capacity atone rpm or C,. Divide the required feeder

capacity by C, to obtain the requiredspeed in rpm.

CN =

Ct

where:

N = Speed of feeder in rpm.

C = Required capacity of feeder, ft3/hr.

C1 = Capacity at one rpm, ft3/hr.

This maximum rpm is not absolute but hasbeen selected as general recommendedpractice. Experience with a particular setof conditions, or application, may establishslightly different design limitations. Manyfactors including bin or hopper design, asubject not covered here, will significantlyaffect screw feeder performance.

Single Screw Feeder ArrangementThe arrangement and dimensional datafor single screw feeders are shown inFigure F, page 47, and Table 16.

Extension ConveyorThe arrangement of an extensionconveyor, directly connected to a singlescrew feeder, is shown in Figure G, page47. Obviously the extension conveyormust operate at the same rpm as thefeeder. The size of the extensionconveyor may be obtained by referring toTable 5, page 35. For the code class ofthe material to be handled find a screwdiameter which will give an equal orgreater capacity in cubic feet per hour atone rpm than the C, capacity of thescrew feeder used in the formula todetermine the feeder speed. The degreeof trough loading corresponding to thecode class of material to be handled andits abrasiveness, must not be exceeded.

(1)Dimensions are typical and approximate. Actual dimensionsshould be certified for installation purposes.

(2)Based on 100% of theoretical capacity with standard pitchand screw pipe. For nonstandard pitch or pipe size consultscrew conveyor manufacturer.

(3 )Maximum in regular construction. Larger inlet openingsrequire engineering consideration not covered here.

(4)The length C is equal to two standard pitches.

47


Power RequiredThe calculation of the required horsepowerto operate screw feeders is very similar tothat involved for standard screw conveyors.Essentially, the calculation involves theaddition of two horsepowers, one for emptyfeeder friction, and the other the materialfriction.

Horsepower for Single Screw Feeder:(HPa + HPb)FoHP = _______________

e

Horsepower for Single Screw Feeder withExtension Conveyor:

1(HRa + HPb + HP1 + HPm) FoHP = _____________________________e

Where: Empty Feeder Friction Power

L1 N Fd FbHPa = ____________1,000,000

Feeder Material Friction Power

C W Lf FmHPb = ____________1,000,000

and Empty Extension Conveyor FrictionPower

L N Fd FbHPf = ___________1,000,000

Extension Conveyor Material Friction Power

C W L FmHPm = ___________1,000,000

and the nomenclature used is defined:

C = Capacity in ft3/hr.

W = Apparent density of materials asconveyed, lbs/ft3

L = Length of extension conveyor, feet.

Lf = Equivalent length of feeder, feet.See Table 17, page 48, for methodof arriving at values of L1.

L l = Length of feeder, feet, asshown in Figures F and G.

N = Speed of screw rotation, rpm.

Fb = Hanger bearing factor,Table 13, page 41.

Fd = Conveyor diameter factor,Table 14, page 42.

Fm = Material factor, Table 4,pages 26 thru 34.

Fo = Overload factor, Figure 14,page 42.

e = Efficiency of the drive selected.

Single Screw FeederFigure F

Single Screw Feeder With Extention ConveyorFigure G



Example ofSingle Screw Feeder SelectionProblem:Select a single screw feeder withoutextension conveyor for the followingconditions

Material to be handled Salt cake,dry,pulverized

Weight per cubic foot 65-85 lbsper ft3

Capacity 26 tons(2000lb) perhour = 800cubic feetper hour

Length of feeder, L1 10 feet

Inlet opening 40incheslong, 10inches wide

Required is an even rate of flow along thewhole inlet opening.

Solution:(a) From table 4, pages 26 thru 34, salt cake

is code classified at 75 B636 TU has acomponent group designation of 3-D anda material factor (Fm,) of 1.7.

(b) From Table 13, page 41, for a ComponentGroup D, the hanger bearing factor, Fb =1.0. Since this example does not have ahanger, Fb = 1.0. Use the appropriatefactor when a hanger bearing or a tailbearing that utilizes a hanger insert typebearing is used.

(c) To be prudent, for capacity calculationsuse the lowest apparent density, 65lbs/ft3.Then the volume for 26 tons perhour is

(26) (2000) =65

800 ft3/hr required feed rate.

(d) Referring to Table 16, page 46, a 9-inch diameter single screw feederwill handle 1202 ft3/hr at a maximumof 65 rpm and C1 =18.5 at one rpm.Using the formula for speed.

C 800N = __ = _______ = 43.2 rpmCf 18.5

(e) From Table 17, the equivalent length ofthe feeder is

B CL1 + ____ + ____ in which6 12

B 40L1 = 10, _____ = _____ or 6.7, and6 6

C (18)____ = _____ = 1.512 12

Lf = 10 + 6.7 + 1.5 + 18.2 feet

(f) From Table 14, page 42, the “conveyordiameter factor Fd = 31.

(g) Again to be prudent, for powercalculations it is well to use the largestapparent density for W, so W = 85 lbs/ft3.

L1 N Fd Fb(h) HPa = ______________ =1,000,000

(10) (43.2) (31) (1.0)______________________ = .013 HP1,000,000

C W Lf Fm(i) HPb = ______________ =1,000,000

(800) (85) (21.5) (1.7)________________________ = 2.10 HP1,000,000

(j) Referring to Figure D, page 42, the factorFo depends upon the sum of thehorsepower for friction of the emptyconveyor (feeder in the example) andthe horsepower of

(HPa + HPb) FoHP = _______________ =e

(.013 + 2.10) (1.57)______________________ = 3.90 HP.085

material friction. In this example this sum is.059 + 2.10 = 2.113 HP and Fo = 1.57.

(k) Then assuming a drive efficiency(expressed decimally) of 0.85,

Or use Figure E, page 42 HPt = (HPa + HPb) = 2.159 MHP = 5

(1) Use a 5 hp electric motor with speedreduction to 43.2 rpm.

The theoretical estimated powerrequirements calculated in the foregoingexample conceivably could be exceeded tothe extent that the full 5 horsepower ofthe motor would be used. Therefore, allcomponents of the power train, the feedershaft, the screw pipe shaft and the screwitself should be capable of withstanding-atthe speeds involved for each-the torsionforce or torque of full 5 horsepower. SeeTable 15, page 43 for torsional capacitiesof screw conveyor components.

Effect of Material Loads on ScrewIn many cases, where screw feeders aremounted at the bottoms of bins or hoppers,the screw has to perform its function underheavy loads of material above the binopening or feeder inlet. Under certainconditions and with certain materials thestart-up torque can be very high, resulting inbigger drives and heavier feedercomponents.

An alternative solution is the use of multiplescrew feeders. Multiple screw feeders mayconsist of twin, triple, or quadruple screws,side by side to feed materials from very wideinlet openings.

49


Conveyor Designation SystemScrew diameter & pitch12- = Full Pitch12-8 = 2/3 pitch12-6 = 1/2 pitch12-4 = 1/3 pitch

Coupling diameter3 = 11/2"4 = 2"5 = 2 7/16"6 = 3"7 = 3 7/16"

E = Standard LengthEF = RightingF = Flight

Type Conveyor

H = HelicoidHR = Helicold ribbonHS = Hellcoid stainlessHSR = Helicold stainless ribbonS = SectionalSIR = Sectional ribbonSS = Sectional stainlessSSR = Sectional stainless ribbonNOTE: Q prefix on all above types for Quik-Link.

Flight thicknessat outer edge 1/64" increments


component selection

Helicold Flight Conveyor Screws are made of a continuous one-piece helixfastened to a pipe with spaced intermittent welds. Steel lugs are welded topipe and flight at both ends, except on 4-inch size.

Helicoid Flight Conveyor Screw

51

component selection

Helicoid Flight

Helicold Flighting is manufactured in a continuous one-piece helix of thedesired diameter, pitch and thickness. The helicold flight is tapered in crosssection, with the thickness at the inner edge about twice the thickness atthe outer edge,

component selection

Sectional Flight Conveyor Screws consist ofindividual flights formed into a helix. then buttwelded together and fastened to a pipe or shaftwith spaced intermittent welds, Steel lugs arewelded to pipe and flight at both ends, excepton regular sectional flight screw sizes largerthan 16-inch diameter. Both ends of the pipehave permanent internal collars with insidediameters to accept couplings, drive shafts orend shafts.

Sectional Flight Conveyor Screw Sectional Flight


component selection

53


component selection

Sectional Flights are individual flights formed into a spiral or helix of thedesired diameter and pitch, butt welded together to form a continuous conveyorscrew.

55

component selection


component selection

Ribbon flight conveyor screws consist of sectional flights, butt welded together toform a continuous helix. Flights are secured to the pipe by supporting lugs. Both endsof the pipe have permanent internal collars with inside diameters to accept couplings,drive shafts and end shafts.They are used for conveying sticky, gummy or viscous substances, or where thematerial tends to adhere to flighting at the pipe. Stainless steel ribbon flight conveyorscrews can be furnished.

57

component selectionType 1 Paddles consist of formed steel blades mounted on bolt or rod shanks which are insertedthrough regular conveyor screw pipe. They are normally mounted at 120 degree intervals spacing,three paddles per pitch. Paddle at each end of conveyor may be inserted through bolt hole inplace of regular coupling bolt. Paddle blades may be set at any angle to produce the desireddegree of agitation. Paddle conveyor screws are used for mixing, blending or stirring dry or fluidmaterials.

Drive shafts deliver the driving power, and are designed to provideadequate torque, bending and shear strength, and correct bearingclearances. For extra heavy loads, high carbon steel or heat-treated alloysteel shafts are used. Jig-drilled coupling bolt holes and accurately cutkeyseats contribute to ease of assembly.

End shafts serve only as support for the last section of conveyor screwand are furnished of cold-finished steel.


component selection

59

component selection


component selection

End Lugs are die-formed steel plates welded to both ends of helicoldflighting and to the pipe to strengthen the end of flighting.

Split Flight Couplings permit installing or removing individual conveyorscrews without disturbing adjoining sections. With split flight couplingsinstalled on both sides of each hanger, conveyor screws can be removedwithout disturbing the hangers. The split flight coupling is sturdilyconstructed and jig drilled for coupling bolts.

61

component selection

Split Flight Coupling Shafts are used to transmit rotation and to positionaccurately and support the split flight couplings.


component selection

No. 270 Hangers have formed steel frames and self-aligning ball bearingswhich reduce power consumption and noise levels.

63

component selection

No. 216 Hangers have formed steel frames of superior strength and rigidtyand are excellent for heavy service. These hangers are normally furnishedwith hard iron, babbitted: bronze, oil impregnated wood or molded fabricbearinqs, but can also be furnished with special bearings.


component selection

No. 226 Hangers have a rigid formed steel frame with clearance for passageof material in large volume. These hangers are normally furnished wit h hardiron, babbitted, bronze, oil impregnated wood or molded fabric bearings, butcan also be furnished with special bearings. Stainless steel frames can befurnished.

65

component selection

No. 316 Hangers are similar in construction to No. 216 hangers, except thatthey are self-adjusting. The top bars are arranged to slide on angle guidesfastened to the troughs. These hangers are normally furnished with hard iron,babbitted, bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.


component selection

No. 326 Hangers are similar in construction to No. 226 hangers, except thatthey are self-adjusting. The top bars are arranged to slide on angle guidesfastened to the troughs. These hangers are normally furnished with hard iron,babbitted, bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.

67

component selection

No. 216F Hangers are similar in construction to No. 216 hangers, except thatthey are designed for mounting in flared trough. These hangers are normallyfurnished with hard iron, babbitted, bronze, oil impregnated wood or moldedfabric bearings, but can also be furnished with special bearings.

component selection

No. 220 Hangers are similar in construction to No. 226 hangers, except thatthey are mounted on top of the trough angles or flanges. These hangers arenormally furnished with hard iron, babbitted, bronze, oil impregnated wood ormolded fabric bearings, but can also be furnished with special bearings.Stainless steel frames can be furnished.


component selection

No. 230 Hangers are similar in construction to No. 216 hangers, except thatthey are mounted on top of the trough angles or flanges. These hangers arenormally furnished with hard iron, babitted, bronze, oil impregnated wood ormolded fabric bearings, but can also be furnished with special bearings.Stainless steel frames can be furnished.

69

component selection


component selection

Trough End Plates consist of heavy steel plate, flanged at the top forsupporting the trough cover. They can be furnished with or without feet,formed by a flange at the bottom for supporting the conveyor trough. Theyare drilled and countersunk on the back side, to suit either babbitted, bronze,or ball bearing flanged units, or shaft-mounted screw conveyor drive adapterhousings. Trough end plates with mounting holes located other than shown,can be furnished. Stainless steel trough end plates with or without feet, canbe furnished.

71


component selection

73

component selection


component selection

75

component selection



Trough Ends

77

component selection

Double Ball Bearing Flanged Blocks with drive shafts consist of rigid shaftsoperating in two single row, deep groove ball bearings which are effectivelysealed and mounted in heavy, one-piece gray iron housings. Spring lockingcollars with two set screws hold bearings firmly on shafts. This unit willaccommodate radial and thrust loads. Shafts are available for use with orwithout trough end seals. These flanged blocks can also be furnished withtail shafts.

Trough End Seals provide bearing protection against dust or fumes fromwithin the trough and against entrance of dirt, moisture or lubricantalong the shaft. The gray iron seal housings are designed for assemblybetween bearing flanged blocks and the trough end plates. They can beprovided with lip-type seals for maximum protection for or against thematerials being handled, with felt seals when handling dusty materials,or with waste packing when handling abrasive materials.

Screw conveyor


component selection

79

Drive Shaft Trough Ends with Double Roller Bearings have large radialcapacity. In addition, the assembly accommodates heavy thrust loads ineither direction, making separate thrust provisions unnecessary.


component selection

Double Roller Bearing Flanged Blocks with drive shafts consist of rigid shaftsoperating in two oversize roller bearings which are effectively sealed andmounted in rugged two-piece gray iron housings. The bearings are held in placeby necked shafts and are suitable for heavy thrust loads in either direction inaddition to carrying radial loads for overhung drive applications. These flangedblocks can also be furnished with tail shafts.

81

component selection

Outside Discharge Trough Ends are for bolting to conventional trough flanges,permitting free discharge of material below the trough end. They are made ofheavy steel with a top flange to support the trough cover and are fitted withbabbitted, bronze or ball bearing flanged blocks.

Seal Glands are mounted internally on all trough ends except the outboardbearing type where they are externally mounted. They consist of gray iron splitflanges in which packing materials are compressed against machined steelcollars. These seals provide maximum protection for or against materials beinghandled.


component selection

Outboard Bearing Trough End Brackets permit the use of pillow blockbearings to accommodate greater thrust, radial loads and special sealingarrangements.

83

component selection

Screw Conveyor U-Troughs are made in two basic types: angle flanged andflanged. Angle flanged troughs consist of steel angles welded lengthwise tothe trough plates to form the top flanges. Flanged troughs are made byforming the top flanges integrally with the trough sides from a single steelplate. Steel end flanges are securely welded to each end of the trough plate

in special fixtures to assure square, true connections, They also preserve troughcontour and facilitate assembly, Angle end flanges are used on troughs for 4-through 12-inch diameter screws, and plate end flanges on all other sizes, Troughsmade of stainless steel, or other kinds of special metals for specific purposes, canbe furnished.


component selection

85

component selection


component selection

Screw Conveyor Trough Covers are used for the protection ofoperating personnel, dust control or protection for or against thematerial being handled. Covers for U and flared troughs are madein semi-flanged, flanged or hip roof types.

87

component selection


component selection

89

component selection

component selection

Clamps for attaching covers to screw conveyor troughs are available in spring, Quik-Wire and screw types. Quick-acting clamps are primarily used for drop bottom screwconveyor troughs. Spring clamps with brackets are attached to the top side of semi-flanged covers. Plain spring clamps are used for service doors, inspection doors orremovable covers and panels. Quik-Wire clamps and screw clamps are normally usedfor attaching flanged covers to screw conveyor troughs, but can also be used forattaching plain and semi-flanged covers.

Shrouds are used in trough sections of screw feeders to decrease the clearance betweenthe cover and feeder screw to obtain proper feed regulation. Lengths are sufficient toprevent flushing of the majority of materials being handled and gauges are proportioned totrough size and gauge. Stainless steel shrouds can be furnished.


component selection

(1) Bolts are not included. Support Foot / Saddle includeclips for welding to trough.

(2) Supporting feet are regularly furnished. Only onesupporting foot per trough section is normally required.

(3) Six bolt holes(4) Eight bolt holes(5) Ten bolt holes(6) Twelve bolt holes

91

Trough End Flanges (Dimensions) A B L

N Screw Thru 3/16” Angle Flanged Trough Thru 3/16” Diameter 10 Ga. and Flanged 10 Ga. and Inches Trough 1/4” Trough Thru 3/16” and Trough 1/4” Trough Thru 1/4” 10 Ga. 1/4” Trough Inches 4 51/4 – 35/8 – – 11/4 n/a 3/8(3) 6 71/4 73/8 41/2 – – 11/4 11/4 3/8(3) 9 101/4 101/2 61/8 – – 13/4 11/2 3/8(4) 10 111/4 111/2 63/8 – – 13/4 11/2 3/8(4) 12 131/4 131/2 73/4 – – 2 2 1/2(4) 14 151/4 151/2 91/4 91/8 9 2 2 1/2(4) 16 171/4 171/2 105/8 101/2 10/8 2 2 5/8(4) 18 191/4 191/2 121/8 12 117/8 21/2 21/2 5/8(5) 20 211/4 211/2 131/2 133/8 13/4 21/2 21/2 5/8(5) 24 251/4 251/2 161/2 163/8 161/4 21/2 21/2 5/8(6)

Trough End Flanges (Part Numbers & Weights) End Flange Part Number (1) Weight Angled Flanged Trough Flanged Trough PoundsThru 10 Ga. 3/16” 1/4” Thru 10 Ga. 3/16” 1/4” Trough Trough Trough Trough Trough Trough 278-19-1 278-19-4 n/a 278-19-7 278-19-10 n/a 1278-19-13 278-19-16 278-19-19 278-19-22 278-19-25 278-19-28 3278-19-31 278-19-34 278-19-34 278-19-40 278-19-43 278-19-43 5 278-19-U 278-19-X 278-19-X 278-19-BG 278-19-BK 278-19-BK 6278-19-AD278-19-AG 278-19-AG278-19-BR 278-19-BU 278-19-BU 10 278-10-1 278-10-2 278-10-2 278-10-4 278-10-5 278-10-5 6.4 278-11-1 278-11-2 278-11-2 278-11-4 278-11-5 278-11-5 7.11278-12-1 278-12-2 278-12-2 278-12-4 278-12-5 278-12-5 10 278-13-1 278-13-2 278-13-2 278-13-4 278-13-5 278-13-5 11 278-15-1 278-15-2 278-15-2 278-15-4 278-15-5 278-15-5 13

Supporting Feet are of formed steel for use with end flanges and provide aconvenient means of aligning and supporting conveyors from floors, andsupporting structures.

Trough End Flanges are made of steel plates, formed and punched toassure accurate, closely-fitted trough connections and completeinterchangeability.

Support Foot / Saddle Trough Trough Part Number Weight Dimensions Diameter Thickness C STL Pounds A C D E T U Plate Thickness M 4 16 GA - 7 GA 166-14-1 1 73/8 53/4 1 7/8 45/8 11/2 3/16 3/8 6 16 GA - 0.25 166-14-5 11/2 10 81/8 1 13/16 55/8 11/2 3/16 3/8 9 16 GA - 0.25 166-14-9 3 12 93/8 11/4 15/16 77/8 21/2 3/16 1/2 9 0.31 - 0.38 166-14-13 3 12 93/8 11/4 15/16 77/8 21/2 3/16 1/2 10 16 GA - 0.25 166-14-17 31/2 123/8 91/2 11/4 19/16 87/8 21/2 3/16 1/2 10 0.31 - 0.38 166-14-21 31/2 123/8 91/2 11/4 19/16 87/8 21/2 3/16 1/2 12 16 GA - 0.25 166-14-25 41/2 15 121/4 11/4 13/8 95/8 21/2 3/16 5/8 12 0.31 - 0.38 166-14-29 41/2 15 121/4 11/4 13/8 95/8 21/2 3/16 5/8 14 16 GA - 0.25 166-14-33 6 161/2 131/2 11/2 13/8 107/8 21/2 1/4 5/8 14 0.31 - 0.38 166-14-37 6 161/2 131/2 11/2 13/8 107/8 21/2 1/4 5/8 16 16 GA - 0.25 166-14-41 71/2 18 147/8 11/2 13/4 12 3 1/4 5/8 16 0.31 - 0.38 166-14-45 71/2 18 147/8 11/2 13/4 12 3 1/4 5/8 18 16 GA - 0.25 166-14-49 8 191/8 16 11/2 13/4 133/8 3 1/4 5/8 18 0.31 - 0.38 166-14-53 8 191/8 16 11/2 13/4 133/8 3 1/4 5/8 20 16 GA - 0.25 166-14-57 12 223/4 191/4 2 2 15 31/2 1/4 3/4 20 0.31 - 0.38 166-14-61 12 223/4 191/4 2 2 13 31/2 1/4 3/4 24 16 GA - 0.25 166-14-65 14 24 20 2 21/4 181/8 4 1/4 3/4 24 0.31 - 0.38 166-14-69 14 24 20 2 21/4 181/8 4 1/4 3/4


component selection

Discharge Spouts and Gates provide the meansfor discharging materials from the conveyortrough and for connection to succeedingequipment to which material is delivered. Gatesprovide for selective control of multiple spouts.When ordered separately, spouts or gates will befurnished loose. When ordered as parts ofcomplete conveyors with locations determined,they will be furnished in place. Stainless steeldischarge spouts and flat slide discharge gatescan be furnished.

93

component selection

component selection


component selection

Rack and Pinion Discharge Gates have cut-tooth racks welded to the slideplates and are actuated by cut-tooth pinions mounted on pinion shafts

operated by hand wheels or chain wheels. Stainless steel rack andpinions can be furnished.

95

component selection


component selection

97

Air Operated Gates for remote operation can be furnished with orwithout air cylinder.


TO AVOID UNSAFE OR HAZARDOUS CONDITIONS, THEFOLLOWING MINI PROVISIONS MUST BE STRICTLYOBSERVED.

1.(A) SCREW CONVEYORS SHALL NEVER BEOPERATED UNLESS THE CONVEYOR HOUSINGCOMPLETELY ENCLOSES THE CONVEYORMOVING ELEMENTS.All necessary housings, covers, safety guards, railings,gratings and power transmission guards must be in place.If the conveyor is to be opened for inspection, cleaning orobservation, the motor driving the conveyor is to belocked out electrically in such a manner that it cannot bestarted by anyone, however remote from the area unlessthe conveyor housing has been closed and all guards arein place. THE HOUSINGS, COVERS, AND GUARDSARE NECESSARY TO PREVENT ANYONE FROMENTERING, REACHING, OR FALLING INTO THEMACHINERY, WHICH MAY RESULT IN SERIOUSPERSONAL INJURY.

(B) If the conveyor must have an open housing as a condition of its use, the entire open conveyor is then tobe guarded by a railing, fence or rugged safety grating.

(C) Feed openings for shovel, front end loader or other mechanical equipment shall be constructed in such away that the conveyor is covered by a rugged grating. It the nature of the material is such that a gratingcan’t be used, then the exposed section of the conveyor is to be guarded by a railing and there shall bewarning signs posted.

2. DO NOT PLACE HANDS OR FEET IN ANY CONVEYOR OPENING, TO AVOIDBEING CAUGHT BETWEEN THE ROTATING CONVEYOR SCREW AND THECONVEYOR HOUSING.3. DO NOT WALK ON CONVEYOR COVERS OR GRATINGS OR POWER TRANSMISSION GUARDS, TO AVOID FALLING INTO OR AGAINST THE ROTATING CONVEYORSCREW.4. DO NOT poke or prod material in the conveyor with a bar or stick, to avoid being struck by the baror stick.

5. DO NOT overload conveyor or use it for anything but its intended use.

6. DO practice good housekeeping.

Screw ConveyorSafety Practices

Syntron Material Handling SCREW CONVEYERS MUST BE INSTALLED,OPERATED AND MAINTAINED IN ACCORDANCE WITH THE Syntron MaterialHandling OPERATION MAINTENANCE, INSTALLATION INSTRUCTION MANUAL.

Saltillo2730 Hwy 145 SouthSaltillo, Mississippi 38866Phone: 662.869.5711Fax: 662.869.7493Toll Free: [email protected]

Corporate OfficeP.O. Box 1370Tupelo, Mississippi 38802Phone: 662.869.5711Fax: 662.869.7449

Form No. 104-TUP Printed in U.S.A. 3/2018

Proven Engineered Products – Complete Material Handling Solutions

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