Spiral conveyor is a mechanical device that uses an electric motor to drive a spiral to rotate and push materials to achieve the purpose of conveying. It can be transported horizontally, obliquely or vertically, with the advantages of simple structure, small cross-sectional area, good sealing, easy operation, easy maintenance, and convenient enclosed transportation. Spiral conveyors are divided into two types in terms of conveying form: axial spiral conveyors and shaftless spiral conveyors. They are also divided into U-shaped spiral conveyors and tubular spiral conveyors in terms of appearance. Axial screw conveyor is suitable for non viscous dry powder materials and small particle materials (For example: cement, fly ash, lime, grain, etc.) and shaftless screw conveyors are suitable for conveying materials that are viscous and easily entangled.