The screw conveyor is divided into a shaft screw conveyor and a shaftless screw conveyor in the form of conveying, and the shape is divided into a U-shaped screw conveyor and a tubular screw conveyor. The axial screw conveyor is suitable for non-stick dry powder materials and small granular materials (such as cement, fly ash, lime, granules, etc.), and the shaftless screw conveyor is suitable for conveyors of viscous and entangled materials. (For example sludge, biomass, garbage, etc.) The working principle of the screw conveyor is that the rotating spiral blade conveys the material and has a screw conveyor so that the force of the material does not rotate together with the screw conveyor blade is the weight of the material itself. The frictional resistance of the screw conveyor housing to the material.
The spiral blades welded on the rotating shaft of the auger have a solid surface type, a belt surface type, a blade surface type, and the like depending on different materials to be conveyed. The screw shaft of the auger has a thrust bearing at the end of the direction of movement of the material to give an axial reaction of the helix and the material. When the machine length is long, the intermediate suspension bearing should be added.