A screw conveyor uses rotating spiral blades to push materials and transport them. The force that prevents materials from rotating with the blades of the screw conveyor is the weight of the material itself and the frictional resistance of the screw conveyor housing to the material. The spiral blades welded on the rotating shaft of the screw conveyor have different surface types depending on the conveyed material, including solid surface type, belt surface type, and blade surface type. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction to provide axial reaction force to the screw along with the material. When the machine is long, an intermediate suspension bearing should be added.