SWL Series Electric Worm Gear Screw Jack for Electric Lifting Platforms
SWL series screw jack is composed of a worm gear reducer and a lifting screw, and its deceleration component is a worm drive, which uses the worm to drive the worm gear to achieve deceleration. The center of the worm gear is an internal thread structure, which is equivalent to the nut of the lifting screw and matches the lifting screw. The drive modes of the screw jack include manual drive, motor drive, and geared motor integrated drive. Motor drives include AC motors, stepper motors, servo motors, etc., which are connected with screw jacks through flanges. Electric worm gear screw jacks are widely used in various electric lifting platforms. In addition, the screw can be installed upwards or downwards according to different application requirements.

| A. Hexagon socket head screw | B. Input cover | C. Oil seal | D. Oil drain plug |
| E. Worm gear box | F. Oil seal | G. Worm | H. Key |
| I. Bearings | J. Asbestos gasket | K. Grease nipples | L. Hexagon socket head screws |
| M. Output cover | N. Asbestos gasket | O. Bearings | P. Worm gear |
| Q. Screw |
| Worm gear | high quality 9-4 copper | |
| Worm | 20CrMnTi | |
| Screw material | 45# steel finishing | |
| Housing material | HT250 cast iron | |
| Bearing | high load bearing,Chinese famous brand or C&U | |
| Oil seal | Chinese famous brands or NAK or SKF | |
| Model | SWL1,SWL2.5,SWL5,SWL10,SWL15,SWL20,SWL25,SWL35,SWL100,SWL150 | |
| Actual loading capacity | 100-200kgs, 200-600kgs, 600-1500kgs, 1500-4000kgs… | |
| Ratio | Ordinary (P) | Slow (M) |
| Structural type | Type 1 – the screw moves in both rotation and axial direction | Type 2 – the screw rotates while the nut on the screw moves in an axial direction |
| Assembly type | Type A – screw (or nut) moves upward | Type B – screw (or nut) moves down |
| Screw head type | – Type Ⅰ,head cylindrical | – Type Ⅰ,head cylindrical |
| – Type Ⅱ,head flange | ||
| – Type Ⅲ,head thread | – Type Ⅲ,head thread | |
| – Type Ⅳ ,head flat head | ||
| Protection of screw rod | – (basic type) | – (basic type) |
| – F (Anti-rotation type ) | – Z (Type with protection shield) | |
| – Z (Type with protection shield) | ||
| Model | SWL2.5 | SWL5 | SWL10/15 | SWL20 | SWL25 | SWL35 | SWL50 | SWL100 | SWL120 | |
| Max lifting load(Kn) | 25 | 50 | 100/150 | 200 | 250 | 350 | 500 | 1000 | 1200 | |
| Screw diameter*threaddimension(mm) | Tr30*6 | Tr40*7 | Tr58×12 | Tr65*12 | Tr90*16 | Tr110*18 | Tr120*20 | Tr160*23 | Tr180*25 | |
| Worm Ratio | P | 6:1 | 6:1 | 7:1 | 8:1 | 10:1 | 10:1 | 10:1 | 12:1 | 12:1 |
| M | 24:1 | 24:1 | 23:1 | 24:1 | 32:1 | 32:1 | 32:1 | 36:1 | 36:1 | |
| Stroke for one input turn(mm) | P | 1.0 | 1.167 | 1.565 | 1.5 | 1.5 | 1.69 | 1.87 | 1.92 | 2.083 |
| M | 0.250 | 0.292 | 0.5 | 0.5 | 0.5 | 0.56 | 0.625 | 0.638 | 0.694 | |
| Max permissible power(kW) | 1.45 | 2.59 | 3.47 | 4.02 | 5.38 | 13.06 | 13.9 | 28.5 | 62 | |
| Weight per 100mmscrew & protective tube(kg) | 0.45 | 0.82 | 1.67 | 2.15 | 4.15 | 5.20 | 7.45 | 13.6 | 17.3 | |
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| Higher Performance | · Accurate and smooth delivery of force. · Increased range of actuation as the stroke position is easily and quickly varied. · Electro-mechanical solutions are more resistant to temperature variations. · Complete control of the entire motion profile using standard control methods. · Repeatable and accurate positioning. |
| Reduced Costs | · The motorized worm gear screw jack is generally cheaper when compared to a hydraulic system when the required ancillary hydraulic equipment is included. · Machinery requires less maintenance as no hydraulic oil to maintain, and no leaks to repair. · Less manual intervention on machinery to set up processes as electro-mechanical solutions can be controlled over the complete motion profile. · Reduced downtime caused by hazardous fluid leaks. · Electro-mechanical solutions only use power when moving the load. In comparison, hydraulic systems generally have to maintain pressure levels to either maintain position when holding a load or to ensure that the system can respond when required. |
| Increased Safety | · In the event of power loss, screw jacks can be self-locking. · No high-pressure oil leaks. |
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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