Pipe screw conveyor (also known as auger conveyor, screw conveyor, and spiral conveyor), is the main unit for mechanical transport operation of industry and agriculture, which uses motor to drive screw rotation and move material to achieve conveying purpose. Pipe screw conveyor is suitable for all industries such as building material, chemical industry, power industry, metallurgy, coal industry and grain industry, for horizontal or tilted transportation for powdery, granular and small lump materials, such as coal, dust, residue, cement and grain which their temperature is less than 200℃.