The development of screw conveyor is divided into two types: axial screw conveyor and shaftless screw conveyor [1]. The axial screw conveyor is composed of screw, U-shaped chute, cover plate, inlet and outlet and driving device. Generally, there are three types: horizontal type, inclined type and vertical type; The shaftless screw conveyor is changed from screw to shaftless screw, and a replaceable lining body is installed in the U-shaped groove. The structure is simple. The materials are input from the feed port and output from the discharge port after being pushed by the screw. The whole transmission process can be carried out in a sealed groove. Generally speaking, the screw conveyor we usually refer to refers to the screw conveyor with shaft type.