A screw jack is a mechanical device used to lift heavy objects, usually consisting of a screw shaft and a nut that fits with it. By rotating the screw shaft, the nut moves along the thread of the screw shaft to achieve the purpose of lifting and lowering heavy objects. The use of screw jacks is very extensive, and the following are some common application areas:

Car maintenance: Screw jacks are commonly used for car maintenance, lifting cars for tire replacement, chassis maintenance, and other work that requires access to bottom components.

Construction engineering: In construction engineering, screw jacks are commonly used to support and adjust the structure of buildings, such as adjusting floor heights or supporting beams and columns.

Industrial applications: In industrial production, screw jacks can be used to adjust and position machine equipment, as well as lift and position components on production lines.

Cargo handling: Screw jacks can be used to lift heavy cargo, allowing it to pass through narrow passages or lifting equipment, such as the cargo box of a truck.

Tightening and loosening: In some cases, screw jacks can be used to tighten or loosen bolts, nuts, and other situations that require precise force.

Emergency rescue: Screw jacks are commonly used for accident rescue, such as lifting stuck vehicles from under obstacles in order to rescue trapped personnel.

Stage and event construction: During the construction process of stage and large-scale events, screw jacks can be used to adjust the height of the stage, support the construction structure, and so on.

In summary, screw jacks have important applications in many fields as they provide a reliable way to lift and adjust heavy objects.