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  • SJ Screw Screw Jacks

SJ Screw Screw Jacks
Unique ductile iron fluted housing to improve the overall performance
patented square tail cover to control the rotation of the screw
absolute mechanical synchronization of the lifting system
safety nut design to monitor the wear of the product and eliminate hidden dangers
combined with geared motors and a variety of accessory modules, to meet the customer's arbitrary requirements Thrust range: 500 kg - 100 tons
+86 188 8822 2133
+86 182 6300 7605

Unique ductile iron groove housing improves overall performance

Patented square tail cover to control the screw rotation

Absolute mechanical synchronous lifting system

Safety nut design monitors the wear condition of the product and eliminates hidden dangers

Combined with reduction motors and various accessory modules to meet any customer requirements Thrust range: 500 kg - 100 tons


Screw jack parameters

model

SJA5

SJA10

SJA20

SJA50

SJA80

SJA100

Rated dynamic load kN

5

10

20

50

80

100

Screw diameter x lead mm

Tr18x4

Tr20x4

Tr30×6

Tr40x7

Tr50x8

Tr60×9


Worm gear reduction ratio

V1

1:4

1:4

1:6

1:7

1:8

1:8

L1

1:16

1:16

1:24

1:28

1:32

1:32

Worm input 1 turn screw stroke mm

V1

1

1

1

1

1

1.125

L1

0.25

0.25

0.25

0.25

0.25

0.281


Maximum input power kW

V1

0.30

0.57

1.14

2.2

2.5

3

L1

0.15

0.27

0.55

1.1

1.5

2.2


Full load starting torque Nm

V1

4.2

8

18

48.5

75

100

L1

1.5

3.1

6.7

20

30

41


Start-up efficiency

V1

0.24

0.25

0.19

0.18

0.17

0.18

L1

0.16

0.16

0.12

0.11

0.10

0.11

Operation efficiency at 1500rpm

V1

0.34

0.35

0.33

0.32

0.31

0.33

L1

0.25

0.25

0.24

0.23

0.22

0.23


No-load torque Nm

V1

0.11

0.29

0.40

0.84

1.85

2.1

L1

0.09

0.18

0.29

0.59

1.12

1.4

Box material


Ductile Iron

Box weight kg


3.2

5

8.5

21.5

36

58

Weight of screw + protective tube per 100mm kg

0.36

0.50

0.75

1.52

2.44

3.02

model

SJA200

SJA300

SJA450

SJA700

SJA1000

Rated dynamic load kN

200

300

450

700

1000

Screw diameter x lead mm

Tr80x12

Tr100×16

Tr120×16

Tr140×20

Tr160x20


Worm gear reduction ratio

V1

1:8:7.5

1:10.25

1:10.75

1:13.33

1:13.33

L1

1:35

1:41

1:43

1:40

1:40

Worm input 1 turn screw stroke mm

V1

1.371

1.56

1.49

1.5

1.5

L1

0.343

0.39

0.37

0.5

0.5


Maximum input power kW

V1

4

7

11.5

18.5

22

L1

3.5

5.5

5.5

7.5

9.5


Full load starting torque Nm

V1

265

460

675

1050

1620

L1

106

180

275

510

820


Start-up efficiency

V1

0.17

0.18

0.16

0.16

0.15

L1

0.11

0.12

0.10

0.11

0.10

Operation efficiency at 1500rpm

V1

0.33

0.33

0.30

0.31

0.29

L1

0.22

0.23

0.20

0.21

0.19


No-load torque Nm

V1

2.8

3.8

5.5

8.5

11

L1

2.1

3.1

4.5

5.5

7.5

Box material


Ductile Iron

Cast Steel

Box weight kg


75

110

200

400

800

Weight of screw + protective tube per 100mm kg

4.5

6.8

9.0

12.5

16.5

Note: Ambient operating temperature for all series of products: -10℃-40℃, (If -40℃-+70℃ is required, please consult local engineers)

The lead screw can provide double-ended and triple-ended lead screws, and the lifting speed increases proportionally. Please consult the sales engineer for specific parameters.


Selection considerations:

◆The duty cycle is the percentage of working time within 10 minutes. The duty cycle of SJA series ordinary gear screw jacks is 30%, and the duty cycle of ball screw screw jacks is 50%. When the actual load is less than the rated load, the duty cycle can be appropriately increased. Please consult an engineer for details.

◆Maximum input speed is 1800rpm

◆When the actual load is 25% to 100% of the full load (i.e. the load rate is 25%-100%), the input torque = load rate x full load torque

◆When the stroke is greater than 300mm, the stability should be checked. Please refer to the load and stroke stability curve for verification.

◆Adjust the safety factor according to the load type. Uniform load 1.0-1.2; Medium load 1.3-1.5; Heavy load 1.6-2.5

◆The input power of the screw jack under normal working conditions cannot exceed the maximum input power, input power kW = (full load torque Nmx load rate x input speed rpm) / 9550

◆The working environment temperature affects the maximum input power.

Actual maximum input power = rated maximum input power x temperature coefficient, -10℃-25℃ temperature coefficient = 1, 30℃ temperature coefficient = 0.85, 40℃ temperature coefficient = 0.65

◆The combination coefficient should be considered when designing a synchronous lifting platform, and the linkage loss should be considered when calculating the total power. The combination coefficient of two units is -0.95; three units is -0.9; four units is -0.85; 6-8 units is -0.8. When the spiral lift is hinged at both ends, the combination coefficient should be appropriately increased.

◆Ordinary gear screw screw jacks with large reduction ratios have a self-locking function, while those with small reduction ratios have uncertain self-locking. Brakes must be configured in safety and vibration situations.

◆The lead error of ordinary toothed screw and ball screw lifts over a 300mm travel is 0.1mm.

◆ To avoid lateral force on the screw jack, you can consider using guide rails, guide devices, etc. to offset the lateral force or use a self-aligning nut screw jack.

◆For non-standard special design requirements, please contact our engineers.


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