According to the different angles of the material displacement direction, screw conveyors can be divided into horizontal screw conveyors, inclined screw conveyors and vertical screw conveyors. Flour manufacturers often use inclined screw conveyors. Conveyor conveys the wheat from the bottom feeding port, and then conveys it upwards at an inclined angle, and then unloads the wheat from the discharge port. One of the main purposes of the inclined screw conveyor in flour mills is when the wheat is unloaded because of the inclination angle. The reason can remove part of the impurities in wheat.