Usually screw conveyor is consisted of screw body, inlet ,outlet and drive device . For screw blades ,there exist solid screw blade, ribbon screw blade and paddle screw blade . Among of them ,paddle screw blade is few applied which is mainly used to press materials .For ribbon screw blade , it can agitate,mix and convey during transporting. Comparing with other conveying equipment, screw conveyor’s sectional area is small , sealing effect is perfect ,reliable working, can set up multi-feed inlets and outlets . Most important the screw conveyor is easy to operate and repair.