Introduction to screw jacks

Screw jack, also known as mechanical jack, is driven by manpower through a screw pair, and screw or nut sleeve is used as the lifting part. Ordinary screw jacks support heavy objects by the self-locking action of the thread, and have a simple structure, but the transmission efficiency is low and the return stroke is slow. The thread of the self-falling screw jack has no self-locking effect and is equipped with a brake. When the brake is released, the heavy object can descend quickly by itself, shortening the return time, but the structure of this jack is more complicated. Screw jacks can support heavy objects for a long time, with a maximum lifting capacity of 100 tons, which is widely used. After the horizontal screw is installed in the lower part, the heavy objects can be moved laterally in a small distance.