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Lim-Tec widely used

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Tel：010-87757706/87757858

Fax：010-87757857

Contact Address：Tongzhou District of Beijing the North off fluent Road north 5 km

SJA series screw jack

　　The patented external shape design-unique rectangle fluted housing of the screw jack increases the heat-dissipation ability of the housing and extend the lifetime of the lubricant etc. The material of ductile cast iron raises the hardness and increase the efficiency and the wide application in low or high temperature environment of the housing. The design of the rectangle rear tube prevents the screw
　　from self-rotating and the safety nut offers a guarantee to the security of the screw jack and monitors the wear degree of the nut.The advanced manufacturing equipments and assembling technique ensures the high quality of the products, leading designing concept creates superior products featuring in the strong shock-load resistance, high duty cycle, low noise, long lifetime and small size.
　　Modularized combination enriches the matches of the products, the random combination between the actuator and the motor, and the special functional accessory provides thousands of choices to the customer.
　　Complete accessories: bellow, anti-backlash design, safety nut, ball screw, limit switch, overload clutch, potentiometer, encoder, brake, hand-wheel, mounting accessories.

Product parameters

Size SJA5 SJA10 SJA20 SJA50 SJA80 SJA100 SJA200 SJA300 SJA450 SJA700 SJA1000
Max lifting load [kN] 5 10 20 50 80 100 200 300 450 700 1000
Screw dia x pitch [mm]

Tr18

x

4

Tr20

x

4

Tr30

x

6

Tr40

x

7

Tr50

x

8

Tr60

x

9

Tr80

x

12

Tr100

x

16

Tr120

x

16

Tr140

x

20

Tr160

x

20
Worm ratio V1 1:4 1:4 1:6 1:7 1:8 1:8 1:8.75 1:10.25 1:10:75 1:13.33 1:13.33
L1 1:16 1:16 1:24 1:28 1:32 1:32 1:35 1:41 1:43 1:40 1:40
Stroke for one input turn [mm] V1 1 1 1 1 1 1.125 1.371 1.56 1.49 1.5 32333
L1 0.25 0.25 0.25 0.25 0.25 0.281 0.343 0.39 0.37 0.5 0.5
Max input power [kW] V1 0.30 0.57 0.14 2.2 2.5 3 4 7 11.5 18.5 22
L1 0.15 0.27 0.55 1.1 1.5 2.2 3.5 5.5 5.5 7.5 9.5
Max starting torque at full load [Nm] V1 4.2 8 18 48.5 75 100 265 460 675 1050 1620
L1 1.5 3.1 6.7 20 30 41 106 180 275 510 820
Starting efficiency V1 0.24 0.25 0.19 0.18 0.17 0.18 0.17 0.18 0.16 0.16 0.15
L1 0.16 0.16 0.12 0.11 0.10 0.11 0.11 0.12 0.10 0.11 0.10
Running efficiency at 1500rpm V1 0.34 0.35 0.33 0.32 0.31 0.33 0.33 0.33 0.30 0.31 0.29
L1 0.25 0.25 0.24 0.23 0.22 0.23 0.22 0.23 0.20 0.20 0.19
Torque without load [Nm] V1 0.11 0.29 0.4 0.84 1.85 2.1 2.8 3.8 5.5 8.5 11
L1 0.09 0.18 0.29 0.59 1.12 1.4 2.1 3.1 4.5 5.5 7.5
Housing material 　 Spheroidal graphite iron Cast
Weight [kg] 　 3.2 5 8.5 21.5 36 58 75 110 200 400 800
Weight per 100mm
screw protective tube [kg]		 0.36 0.50 0.75 1.52 2.44 3.02 4.5 6.8 9.0 12.5 16.5

Features:

Linear speed： up to 75mm/s
Input speed：1800rpm
Stroke：up to 6.5m
Precise positioning :0.1mm/300mm，(If with anti-backlash,precision up to 0.04mm)
Uniform lifting speed
Quick, sure operation
Ballscrew and two,three or four starts threads available
Operating duty cycle up to 50% over a 10 minute period (normal:30%)

  • Travelling Screw S type：

    Travelling screw models operate with screw being driven through the centre of the wormwheel, In operation, the screw does not rotate.Space must be available for the screw to protrude below the gearhousing when in a fully closed position

  • Travelling nut R type：

    Travelling nut models have the screw fixed to the wormwheel.In operation the screw rotates with the wormwheel, driving the nut up and down.overall dimensions for this combination remain fixed

  • Motorized screw jack：

    Every type screw jack can be adapted with Ac motor, gearmotor ,Dc motor, Servo motor,Step motor by Flange adaptor, please check the input power does not exceed to Max permissible operating power.

  • Gearmotorized screw jack：

    Every model of screw jack can be connected with gearmotor adapted by flange adapter, please check the input torque does not exceed to Max torque at full load.