The spiral jack is a type of lifting machinery, mainly with screws, handles, bases, threads, rotating rods, stalls, cups and other parts. The jack is a simple lifting device with a small height. Jack is also called weightlifting, top -heavy machine, top lift, etc. It is a simple lifting machine that can push up, decrease or displacement with a small force. It can also be used to correct the deviation of the equipment installation and deformation of the component. The spiral jack is a mechanical jack. By pulling the handle of the reunion, the claws are pushed to turn the spiny wheel gap. The small umbrella gear drives the large umbrella gear and rotates the weightlifting screw, so that the lifting sleeve can be lifted or decreased, and the lifting function is achieved. Advantages have obtained a wider application in industry.