Divided into two types of trough screw conveyor with tubular screw conveyor, screw conveyor according to the mechanical form according to whether the axis of classification, can be divided into a shaft screw conveyor and shaftless screw conveyor two kinds. 

 Shaft and shaftless screw conveyor, mechanical principles, the role is basically the same materials are used for transportation equipment. There is a difference between different types of screw conveyor, with its own unique little, they are based on customer requirements, the application of different industries improvements made by the ordinary screw conveyor. 

 The shaftless screw conveyor is improved by a shaft screw conveyor ordinary screw conveyor. Shaftless screw conveyor with a shaft screw conveyor, is superior, it is capable of handling a shaft screw conveyor which is not possible or difficult to transport materials, such as: granular materials, pasty materials, semi-fluid material, viscous material, easy to plug and ease of winding material. 

 Shaft screw anti-winding strong mechanical central axis, therefore there will be no interference in the transportation of materials easy to wound, quick and easy transportation. This point, the shaft screw can not be done.