Screw feeder is also called augers ,which is a continuous conveying equipment which is non flexibility drag parts （the flexibility drag parts refer to chains ,belt ,ropes ,etc ). It transport materials along the chute by the rotating screw flights. Augers are widely used in conveying products which are wheat ,corns,beans,vegetable seeds ,etc. Usually augers are horizontal ,incline and vertical type. Augers are consisted of screw shaft with flights, chute, bearing ,drive device ,etc . The screw shaft refers to the screw flights that are welded on a seamless pipe . According to the rotating of screw flights on seamless pipe ,screw flight is divided into right and left .