A winch is a light and small lifting device that uses a reel to wind a wire rope or chain to lift or pull heavy objects. The official name of the winch is the hoist, which is a device that drives the drum by human or mechanical force and winds the rope to complete the traction work. It is divided into hand winch and electric winch. The winch can be used alone or as a component in machinery such as lifting, road construction and mine hoisting. It is widely used because of its simple operation, large amount of rope winding and convenient displacement. Mainly used in construction, water conservancy projects, forestry, mines, docks, etc. for material lifting or flat dragging.