Principles and Structural Features of Spiral Blade Conveyance

Helical conveyors come in three types of spiral blades: solid spiral surface, belt spiral surface, and blade spiral surface. Among them, the blade spiral surface is relatively less used and is primarily employed for conveying materials with high viscosity and compressibility. This spiral surface type, during the conveying process, simultaneously performs and completes functions such as mixing and blending of the material.

The conveying principle: The rotating spiral blades push the material, facilitating the operation of the spiral conveyor. The force that prevents the material from rotating with the spiral conveyor blades is the material's own weight and the frictional resistance from the conveyor casing against the material.

Features: The screw conveyor features a rotating shaft with helical blades, which come in different face types such as solid, belt, and blade shapes, depending on the material being conveyed. The screw shaft of the conveyor has thrust bearings at the terminal of the material movement direction to counteract the axial reaction force from the material. For longer machine lengths, intermediate suspension bearings should be added.