Spiral jack is a lifting device used in automotive maintenance, construction, equipment installation and other work environments. Unlike hydraulic jack, it belongs to the mechanical type of jack. There is no hydraulic system inside, only a gear transmission system. It relies on the force of internal small and large gears, worm gears, and lifting sleeves to lift heavy objects without worrying about oil leakage caused by inverted use. In some cases, due to work needs, we can use spiral jack upside down.

After summarizing, we found that the number of times screw jacks are used upside down in these workplaces is relatively high:

1. Pipeline maintenance; 2. Equipment maintenance; 3. Ship manufacturing and maintenance; 4. Railway maintenance.

In theory, we can use a screw jack upside down, but due to the heavy base and large area of the jack, and the small area of the top cover, the top cover is located below and the base is located above, making it unsafe to use. As operators, it is even more important to pay attention to the placement of the jack to prevent it from tilting or overturning.