Screw feeder

A screw conveyor is a machine that uses a motor to drive a spiral to rotate and move materials to achieve transportation purposes. It can be transported horizontally, tilted or vertically, and has the advantages of simple structure, small cross-sectional area, good sealing, easy operation, easy maintenance, and convenient closed transportation. In terms of transportation form, screw conveyors are divided into two types: shaft screw conveyors and shaftless screw conveyors. In appearance, they are divided into U-shaped screw conveyors and tubular screw conveyors. Shafted screw conveyors are suitable for non-sticky dry powder materials and small particle materials (for example: cement, fly ash, lime, grain, etc.) while shaftless screw conveyors are suitable for conveying sticky and easily entangled materials. (For example: sludge, biomass, garbage, etc.) The working principle of the screw conveyor is that the rotating spiral blades push the materials for screw conveyor transportation. The force that prevents the materials from rotating together with the screw conveyor blades is the weight of the materials themselves and The frictional resistance of the screw conveyor casing to the material. The spiral blades are welded on the rotating shaft of the screw conveyor. The blade surface types include solid surface type, belt type surface type, blade surface type and other types according to the different materials being transported. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction to provide the axial reaction force to the screw with the material. When the machine length is long, an intermediate hanging bearing should be added.