working principle

When the screw shaft rotates, due to the gravity of the material and the friction force generated between the material and the tank wall, the material can only move forward along the bottom of the conveyor trough under the push of the blades, as if a nut that cannot rotate moves in translation along the rotating screw. The main forward power of the material comes from the force exerted by the spiral blade to move the material up and forward along the tangential direction of the blade during axial rotation.

In order to keep the screw shaft in a more favorable tensile state, the drive device and the discharge port are generally placed at the same end of the conveyor, while the feed port is placed as close to the tail of the other end as possible. The rotating spiral blade pushes the material forward and conveys it. The force that prevents the material from rotating with the spiral conveyor blade is the weight of the material itself and the frictional resistance of the spiral conveyor housing to the material. The surface type of the blade includes solid surface type, belt surface type, blade surface type, and other types according to the different materials conveyed. 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 with the material. When the machine length is longer, an intermediate suspension bearing should be added.