Conveying lifting is used for horizontal, inclined or short distance conveying materials, while conveying with stirring function, can be multi-point feeding, discharging. Screw elevator is mainly used for conveying powder, granular and small block materials, such as pesticides, veterinary drugs, condiments, additives, chemicals, screw elevator is not suitable for conveying metamorphic, viscous and easy to caked materials. Belongs to the special screw conveyor. The shell of the former is a round tube. The centrifugal force generated by the spiral drives the material to rotate at high speed pushes the material to the wall of the tube, and then is pushed upward by the blade. It can be lifted within 20 meters. The shell of the latter is also a round tube, which is equipped with a blade along the inner helix. The shell is supported on the roller for low speed rotation. The material moves forward along the blade, and the loading and unloading are carried out at both ends.