The main motor drives the main shaft and each layer of the turntable to rotate through the reducer. The turntable drives dozens of ring rollers to roll and rotate in the grinding ring roller through the pins. After the large pieces of material are crushed into small particles by the crusher, they are sent to the storage bin by the elevator. The feeding equipment such as the electromagnetic vibrating feeder or the belt conveyor evenly sends the material to the middle of the upper turntable. Under the action of centrifugal force, the material is scattered around the turntable and falls into the roller of the grinding ring. It is pressed, rolled, and ground by the ring roller layer by layer. Finally, the crushed material is brought into the powder selector for sorting under the action of wind. The qualified fine powder is discharged from the mill with the air flow and collected by the dust collector as the finished product. The unqualified material falls back into the grinding chamber under the action of the powder selector and is re-ground with the newly fed material. This cycle completes the whole grinding process. The airflow with a small amount of fine dust is purified by the pulse dust collector and discharged through the fan and muffler.