Screw Feeder is a kind of machine that can feed the solid material continuously and evenly by screw blade rotation. High-strength material and thickened screw blade to extend the using life. Non-equidistance screw blade technology to make sure material can fall evenly to prevent hardening. The characteristics of screw conveyor: Screw conveyor has following characteristics: Screw blade uses the design of variable pitch screw, which makes materials filling rate change from 100% to below 70%. At the same time, screw conveyor can stay the uniform acceleration motion of conveying materials, reduce the delivery resistance and prevent material from plugging and blocking. The screw pitch gap of screw blade at the bottom of feed inlet port makes the level of material descend uniformly, which avoids the situation that blades press materials in the course of conveying. Afterwards, the materials' moisture and coal slurry are squeezed out, and the materials may harden into hard shell, forming blocking. Reverse blade is installed at the end of discharge hole, which changes the direction of material movement. The knockout plate avoids the heaping up of material and the blocking of discharge hole.