Screw conveyors in conveyor formally divided into spiral conveyors or shaftless screw conveyors are two appearance into u-shape screw conveyors tubular screw conveyors. Shaft screw conveyor perfect powder materials and small particles and shaftless screw conveyors for cohesive and easy winding material. Screw conveyor driven by conveyor, feeding port and device has three major components. Screw conveyor screw shaft material movement in the direction of end thrust bearing with axial force of the material to spiral, Captain long, intermediate hanger bearings should be added. Compared with other transportation equipment spiral conveyor, with small machine size, good sealing performance, smooth and reliable operation, multiple loading and unloading materials and safe operation, convenient maintenance and so on.