A winch is a small and light lifting device that uses a drum to wind a wire rope or chain to lift or pull heavy objects. It can lift vertically, pull horizontally or tilt heavy objects. There are manual winches and electric winches. Electric winches are the main type now. They can be used alone and can be used as a component of machinery such as lifting, road construction and mine hoisting. They are widely used because of their simple operation, high curvature strength and easy movement. They are mainly used in material lifting and flat towing in construction, water conservancy projects, forestry, mining, docks, etc.