It is pipeline trportation equipment for Powder, with single rotary screw inside the pipe, the push material through the spiral screw. It can meet needs for trportation of vast majority of the powder. Screw conveyor is suitable for trportation with various angles and slopes. It has characteristics of convenient installation and stable feeding, widely application in powder trportation. Screw conveyor is also applied in automatic feeding. combined with inverter control, speed converting feeding can be achieved; together with signal given by weighting silo, therefore automatic feeding is achieved.