HAMMER MILL

C R U S H I N G

A N D G R I N D I N G

EN

GLIS

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F IELDS OF APPL ICAT ION

AUBEMA Hammer Mills are used for primary andsecondary crushing of various types of material inalmost all industrial sectors.

FEED MATERIALS

Hard coal and lignite in coal processing plants,coking coal for the iron and steel industry, limestoneand gypsum rock or other related soft to medium-hard minerals, as well as various types of salt.

Hammer Mill, type 1212

MODE OF OPERATION

The feed material is distributed over the wholewidth and fed to the machine by various types ofconveyor systems. The high rotational speed of thebeater heads generates a closed circuit. The feedmaterial strikes the beater heads from above and ishurled between the beaters and the impact wallwhile passing through the machine. This repeatingprocess ensures that the feed material is crushed tothe desired product size.

The flexible suspension of the beater arms on therotor ensures that the Hammer Mill is insensitive todamages caused by any hard foreign particles thatmay be in the feed material. The beater heads arewear parts and can easily be replaced. Adjustmentof the grinding wall to the crushing radius (gapwidth) and rotor speed (m/s) are major factors indetermining the reduction ratio and product size.

SPECIAL FEATURES

The rotor is forged in one piece, the fixing holes forthe beater arms are arranged in a special device.The precisely balanced design of the opposing beaterarms and beater heads ensures smooth running.The beater arms are made of high-quality steel andare easy to replace. The beater heads are manufac-tured from alloy steel or compound casting.

Hammer Mills are designed to be driven at eitherconstant or variable rotor speeds. Inspection flapsand the hinged housing ensure easy maintenance.

Heating system with electrical heating elements Rotor size 1600 mm dia. x 2800 mm width

Heating system with steam or heat transfer oilImpact wall furnished with grinding ledges andreplaceable grate in the lower section for reducingoversized grain

DESIGN

The non-reversible Hammer Mill (type 1211) allowsthe beater heads to be reversed when one side isworn out.

The reversible Hammer Mill (type 1212) allows bi-directional operation so that both sides of thebeater heads can be used.

Cross-section (type 1211) Longitudinal section (type 1211/1212)

Cross-section (type 1212)

TECHNICAL DATA OF MAIN TYPES 1211/1212

* depending on feed size

WeightA B

Sizekg

Rotor Rotor C* D E F G H I K L M N P RØ width

1211/08-04 2160 800 400 300 1100 1300 950 1070 1200 550 650 2900 100 500 1400 8001212/08-04 2550 1400 30001211/08-06 2420 800 600 300 1100 1300 1150 1300 1200 550 650 2900 130 500 1400 8001212/08-06 2850 1400 30001211/08-08 2720 800 800 300 1100 1300 1350 1520 1200 550 650 3000 150 650 1400 9001212/08-08 3200 1400 32001211/08-10 2970 800 1000 300 1100 1300

1550 1750 1200 550 6503200 180 650 1400 10001212/08-10 3500 1400 3400

1211/10-06 3750 1000 600 350 1450 1700 1250 1450 1450 650 800 3500 170 850 1700 10001212/10-06 5000 1900 37501211/10-08 4470 1000 800 350 1450 1700 1450 1650 1450 650 800 3500 180 850 1700 12001212/10-08 5500 1900 37501211/10-10 5100 1000 1000 350 1450 1700 1650 1900 1450 650 800 3600 190 850 1700 11001212/10-10 6000 1900 39001211/10-12 5530 1000 1200 350 1450 1700 1850 2060 1450 650 800 3600 200 850 1700 11001212/10-12 6500 1900 39001211/12-10 6400 1200 1000 400 1800 1900 1750 1980 1700 750 950 3800 200 1000 2000 11001212/12-10 7500 2100 41001211/12-12 7050 1200 1200 400 1800 1900 1950 2200 1700 750 950 3900 220 1000 2000 12001212/12-12 8000 2100 43001211/12-14 7500 1200 1400 400 1800 1900 2150 2420 1700 750 950 3900 240 1000 2000 12001212/12-14 8500 2100 43001211/14-14 9200 1400 1400 450 2150 2100 2200 2500 1900 850 1050 4200 280 1300 2300 14001212/14-14 10500 2300 44001211/14-16 10500 1400 1600 450 2150 2100 2400 2730 1900 850 1050 4200 300 1300 2300 14001212/14-16 12000 2300 44001211/16-16 14000 1600 1600 550 2600 2500 2500 2850 2200 1000 1200 4800 320 1500 2700 16001212/16-16 16000 2700 50001211/16-18 16000 1600 1800 550 2600 2500 2700 3080 2200 1000 1200 4800 350 1500 2700 16001212/16-18 18500 2700 50001211/18-18 20000 1800 1800 650 2800 2800 2950 3400 2500 1185 1315 5500 420 1600 3100 18501212/18-18 24000 3000 58001211/18-20 22500 1800 2000 650 2800 2800 3150 3630 2500 1185 1315 5500 450 1600 3100 18501212/18-20 27000 3000 58001211/18-22 26000 1800 2200 650 2800 2800 3350 3880 2500 1185 1315 5500 500 1600 3100 18501212/18-22 31000 3000 58001211/18-24 29000 1800 2400 650 2800 2800 3550 4130 2500 1185 1315 5500 550 1600 3100 18501212/18-24 34500 3000 58001211/18-25 30000 1800 2500 650 2800 2800 3650 4280 2500 1185 1315 5500 600 1600 3100 18501212/18-25 36000 3000 58001211/18-28 32000 1800 2800 650 2800 2800 3950 4450 2500 1185 1315 5800 600 1600 3100 20001212/18-28 38000 3000 60001211/20-20 35000 2000 2000 750 3000 3100 3350 3980 2800 1300 1500 6200 600 1800 3500 20001212/20-20 41000 3300 65001211/20-22 38000 2000 2200 750 3000 3100 3550 4200 2800 1300 1500 6200 620 1800 3500 20001212/20-22 44500 3300 65001211/20-24 39500 2000 2400 750 3000 3100 3750 4430 2800 1300 1500 6200 650 1800 3500 20001212/20-24 46000 3300 65001211/20-26 41000 2000 2600 750 3000 3100 3950 4650 2800 1300 1500 6200 680 1800 3500 20001212/20-26 48500 3300 6500

Further sizes are available on request. All dimension and performance data are standard values and subject toalteration.

VERSATIL ITY

Depending on the application, various configurationoptions and/or additional structural elements canbe utilized:

– reversible and non-reversible Hammer MillThe reversible version allows the beater heads to be utilized to their optimum by reversing thedirection of drive without having to reverse theheads themselves. A number of different driveconcepts are available. The Hammer Mill can be driven at either constant or variable speed.

– mechanically adjustable impact walls For compensating wear and achieving the desiredproduct size.

– hydraulically adjustable impact wallsFor tasks that frequently vary in relation toproduct quality and particle size distribution.

– pressure shock resistant design of housingAs a protective device when processinghazardous feed materials.

– with surrounding impact wallFor very moist feed materials with a tendency to clog.

– with heated impact walls (electric, steam or heat transfer oil)To improve material flow when processing materials with a tendency to clog.

– with replaceable grate To limit oversized grain. Not suitable for moist,sticky and clayey feed materials.

– for combined grinding and dryingTo reduce moisture content while crushing thematerial at the same time in one cycle.

ADVANTAGES

– high and constant capacity– high availability– long lifetime– easy replacement of wear and spare parts– broad range of application– high reduction ratio

SCOPE OF APPL ICAT ION

– feed size: up to approx. 300 mm– product size: up to < 1 mm

depending on type andsize of feed material

– capacity: up to 5000 t/h– reduction ratio: up to 1:30– required power: up to 1800 kW

PARTICLE S IZE D ISTR IBUT ION AND PERFORMANCE DIAGRAMS BASED ON ACTUAL RESULTS

PRODUCT S IZE D ISTR IBUTON OF VARIOUS QUALIT IES OF COAL

CAPACITY CRUSHING OF COAL TO < 3 mm (80–90 %)

PRODUCT S IZE D ISTR IBUT ION OF COAL AT DIFFERENT ROTOR SPEEDS

CAPACITY OF VARIOUS PRODUCT S IZES OF COAL

resi

due

R (%

)

product size analysis

feed size

1st Australian coal

2nd American coal

3rd Polish coal

grain size d (mm)

machine size

resi

due

R (%

)

pass

ing

D (%

)

grain size d (mm)machine size

AUBEMA CRUSHING TECHNOLOGY GMBH · KÖLNER STRASSE 94 · 51702 BERGNEUSTADT · GERMANY

TEL.: +49(0)2261/4094-0 · FAX: +49(0)2261/4094-350 · MAIL: INFO@AUBEMA.DE · INTERNET: WWW.AUBEMA.COM