As a must-have item on every household's car, the screw jack has been widely popular since its appearance. When we use the jack, we use the screw and nut screw transmission to lift the entire support arm and achieve the purpose of lifting the object. In the screw transmission, the spiral teeth are often subjected to shear and extrusion forces, and the base supports the structure of the entire screw jack. Combined with the basic principles of ergonomics, the structure of the entire screw jack is made more humanized and reasonable to use.

When using a screw jack, be sure to pay attention to the following four issues:

1. The position of the jack should be upright. When lifting, the force of manually rotating the screw should be even. When lowering, it is also necessary to check whether the heavy object has been firmly supported.

2. It is not allowed to use a jack as a permanent support. If long-term support is required, other supports should be added under the heavy object to assist the jack in lifting the heavy object together;

3. When using multiple jacks simultaneously, the lifting action should be consistent to ensure simultaneous lifting and lowering;

4. After disassembling the jack, anti rust oil should be applied to the screw threads to reduce wear and avoid rust.