Screw conveyors are widely used in various sectors of the national economy such as the food industry, building materials industry, chemical industry, machinery manufacturing, and transportation. Screw conveyors are mainly used for conveying all kinds of powdery, granular, and small bulk materials. The bulk materials delivered include grain products such as cereals, beans, and flour, building materials such as cement, clay, and sand, salts, and alkalis. Chemicals, chemical fertilizers, and bulk bulk cargoes such as coal, coke, and ore. Spiral conveyors are not suitable for conveying highly viscous, highly viscous, blocky and easily agglomerated materials. In addition to conveying bulk materials, screw conveyors can also be used to transport a variety of items. The screw conveyor can complete mixing, stirring, cooling and other operations while conveying the material. At the port, screw conveyors are mainly used for unloading, unloading and horizontal and vertical conveying of bulk materials in the warehouse. The spiral unloading machine that uses the horizontal screw shaft directly in contact with the material to remove the material from both sides of the car compartment has been successfully used for many years in domestic ports. The spiral ship unloader consisting of a horizontal screw conveyor, a vertical screw conveyor and a relative screw retrieving device has become a relatively advanced continuous unloader and is increasingly widely used at domestic and foreign bulk terminals.