The classification and working principle of screw conveyor

The classification of screw conveyor:
The screw conveyor was divided into two types in conveying method: the shaft screw conveyor and shaftless screw conveyor. The shaft screw conveyor was used for non-sticky dry material and little particle material such as cement, coal ash, lime and grain. The shaftless screw conveyor was used for sticky and easy winding material such as sludge, rubbish.
In appearance, the screw conveyor could be divided into two types as U-type screw conveyor and pipe type screw conveyor.


The working principle of screw conveyor:
When the screw conveyor works, because of gravity of material and the friction force produced between groove and the material gravity, the material would move as the pushing along the groove bottom. The front material move with the pushing of the back material. So, the material movement on the conveyor is a slipping movement. The vane is divided into solid plate type, belt type, vane type according to different material. If the screw conveyor is too long, the middle of the screw conveyor should be add a hanging bearing.