Screw hoist, also known as screw type hoist, is a screw rod directly or through the guide slider, connecting rod and gate leaf connection, the screw moves up and down to open and close the gate of the machine. With the extensive development of water conservancy and hydropower projects, gates are widely used in reservoirs, irrigation areas, rivers, dams, hydraulic power plants and other projects. And its installation and debugging technology and maintenance is relatively simple, to ensure the quality of the project, and give full play to project benefits.