Introduction to Screw Conveyor

The screw conveyor is a kind of machine that uses the motor to drive the screw to rotate and push the material to achieve the purpose of conveying. It can be transported horizontally, inclined or vertically, and has the advantages of simple structure, small cross-sectional area, good sealing, convenient operation, easy maintenance, and convenient closed transportation. Screw conveyors can be divided into shaft screw conveyors and shaftless screw conveyors in terms of conveying form, and can be divided into U-shaped screw conveyors and tubular screw conveyors in terms of appearance. The shafted screw conveyor is suitable for non-viscous dry powder materials and small particle materials (such as: cement, fly ash, lime, grain, etc.), while the shaftless screw conveyor is suitable for conveying viscous and easily entangled materials. (Example: sludge, biomass, garbage, etc.) The working principle of the screw conveyor is that the rotating screw blades push the material to be transported by the screw conveyor, and the force that prevents the material from rotating with the screw conveyor blade is the material's own weight and The frictional resistance of the screw conveyor casing to the material. The spiral blades welded on the rotating shaft of the screw conveyor have different surface types such as solid surface type, belt type surface type, and blade surface type according to the different materials to be conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction to give the screw axial reaction force with the material. When the length of the screw conveyor is long, an intermediate suspension bearing should be added.