JTM-SERIES WORM SCREW JACKskin.wbscdn.com/skin/S00506/images/pdf/JTM-Series... · Translating Screw Design A translating screw jack has a jack screw translates through the jack housing,

J A C TO N IN D U S T RY C O. ,LT D TEL: 86-769-81585810, 81585852 SKYPE: jactonjack EMAIL: [email protected] WEB: www.screw-jack.com

L I F T I N G S Y S T E M S S O L U T I O N S

JTM-SERIES WORM SCREW JACK

S C R E W J A C K S M I T E R G E A R B O X E S

L I F T I N G S Y S T E M S S Y S T E M S AC C E S S O R I E S

C U S T O M S C R E W J A C K S C U S T O M A C M E S C R E W S

* JTM2.5, JTM5, JTM10, JTM25, JTM50, JTM100, JTM150, JTM200, JTM300, JTM500,JTM750, JTM1000

* Lift force from 2.5kN to 980kN, customized higher lift force screw jack

* Self locking trapezoidal screw, precise positioning, uniform lifting speed

* Translating screw, anti-rotation keyed screw and rotating screw configurations

* Upright mounting, inverted mounting, double clevis pivot mounting

* Top plate, threaded end, clevis end and plain end fittings

* Hand operated, electric driven or both

* Individual or multiple screw jack system arrangements

* Each jack has two worm gear ratios, high speed, low speed

* No standard travel length, all screw jack stroke produced following your needs

Translating Screw Design

A translating screw jack has a jack screw translates through the jack housing, When the jack screw is held to

prevent rotation, the jack screw will move linearly through the housing to push or pull the load. The screw may

produce rotary force when lifting, so anti-rotation measures should be adopted.

Rotating Screw (Travel Nut) Design

A rotating screw jack has a jack screw which turns moving a travel nut. The jack screw is fixed to the worm gear.

The load is attached to the travel nut, to move along the jack screw. Due to its cylindric structure, supporting mode

is often used at the screw end to ensure good transmission of long stroke.

Keyed Screw (Anti-Rotation) Design

The jack screw of a translating jack must be attached to the load which prevents the jack screw from rotating.

Otherwise, the jack screw and the load will turn and not translate. A keyed screw jack can prevent jack screw

rotation, With square protective tube anti-rotation device or milled keyway matching keys, the screw travels up

and down only and produces no rotary force.

ModelJTM 2.5

JTM 5.0

JTM 10

JTM 25

JTM 50

JTM 100

JTM 150

JTM 200

JTM 300

JTM 500

JTM 750

JTM 1000

Maximum load (kN) 1.96 4.9 9.8 24.5 49 98 147 196 294 490 735 980

Outer diameter of screw (mm)

12 16 20 26 40 50 55 65 85 120 130 150

Root diameter of screw (mm)

8.8 10.8 14.8 19.7 30.5 38.4 43.4 51.3 67 102 112 127

Screw pitch (mm) 3 4 4 5 8 10 10 12 16 16 16 20

Ratio iH 5 5 5 6 6 8 8 8 10 2/3 10 2/3 10 2/3 12

L 20 20 20 24 24 24 24 24 32 32 32 36

Screw travel mm per turn of worm

H 0.6 0.8 0.8 0.83 1.33 1.25 1.25 1.5 1.5 1.5 1.5 1.67

L 0.15 0.2 0.2 0.21 0.33 0.42 0.42 0.5 0.5 0.5 0.5 0.56

Efficiency% η

H 26 26 21 21 22 22 20 20 19 15 13 13

L 15 15 12 12 14 15 14 13 11 10 8 8

Permissible max. power (kw)

H 0.16 0.39 0.49 1 2 2.8 3.1 5 8.4 13.4 14.4 21.4

L 0.08 0.18 0.36 0.46 0.63 1.4 2.2 3.2 4.6 5.7 7.2 9.4

No-load torque To (Nm)

0.11 0.11 0.29 0.62 1.4 2 2.6 3.9 9.8 19.6 29.4 39.2

Permissible torque of worm (Nm)

9.8 9.8 19.6 49 153.9 292 292 292 735 1372 1764 2450

Required torque of worm at max. load (Nm)

H 0.83 2.5 6.2 16.1 48.7 90.7 149 238.1 400.1 856 1380.5 2040.9

L 0.42 1.1 2.9 7.4 20 45.3 72.3 124 244 453.3 761.3 1278.3

Permissible max. input (rpm), when max. load

H 1800 1500 750 600 400 300 200 200 200 150 100 100

L 1800 1500 1200 600 300 300 290 250 180 120 90 70

Screw torque Nm, when max. load

2.6 8.6 20.1 65.1 201.5 503.6 813.2 1287.7 2531.9 5551.3 8921.8 13878

H: high speed L: low speed

JTM2.5 DRAWING DIMENSIONS

JTM2.5 DRAWING DIMENSIONS

JTM5 DRAWING DIMENSIONS






















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JTM-SERIES WORM SCREW JACKskin.wbscdn.com/skin/S00506/images/pdf/JTM-Series... · Translating Screw Design A translating screw jack has a jack screw translates through the jack housing,