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Screw jacks use a worm-and-wheel drive to raise and lower a lead screw for height adjustment, lifting, and position control. This article covers selection and operating guidelines.
1. Selection Checklist
- Lift load: Required weight with adequate safety factor.
- Stroke: Maximum screw extension length.
- Speed: Travel rate in mm/min.
- Mounting: Base mount, clevis, flange, etc.
- Screw end type: Plain, threaded, or clevis end.
Do not size on load alone—long strokes require buckling analysis; add guide bushings when stroke is extended.
2. Operating Practices
Lubrication: Lubricate internal worm gearing regularly; grease exposed screw threads for dust and corrosion protection.
Guidance: Unguided screws whip under load. Long-stroke applications require guiding structures.
Self-locking: Worm-driven screw jacks self-lock when power is removed. Under impact loads, add a brake for safety.
3. Multi-Unit Synchronization
For synchronized lifting, connect units with drive shafts and couplings driven by a single motor. Do not drive multiple jacks independently—they will not stay synchronized.
4. Common Problems
- Jerky motion: Check lubrication, guide alignment, bent screw.
- Abnormal noise: Inspect internal worm gear wear or bearing damage.
- Drift on descent: Severe wear has reduced self-locking—replace worm gear set.
Dezhou Xinmi Machinery supplies screw jack worm gear parts from drawings or samples.
