The matched material is sent from the feeding screw to the center of the mill, and the mill rotates under the drive of the main motor, due to the centrifugal force. The material is dispersed to the edge of the grinding plate, and under the action of the gravity of the grinding roller and the applied grinding force, the shearing force of the grinding roller on the material is transformed into the material extrusion and grinding, and some large particles fall into the nozzle ring and scrape out of the grinding chamber through the scraper. The grinding roller rotates under the friction force of the material at the same time. The ground material is suspended under the suction force of the induced draft fan and the material that meets a certain fineness requirement enters the separator. Part of the particles due to the collision with the guide blade, material and material collision and centrifugal force, into the grinding ground again, qualified materials through the collector to the finished product bin.