The feeding system evenly introduces the materials into the grinding chamber, where they are subjected to a high-speed rotating grinding disc. Under the centrifugal force, the material collides with the grinding gear ring and is then impacted by various comprehensive forces such as shearing, friction, and collision. The ground particles move with the airflow to the classifying chamber, where a frequency conversion-regulated classifier wheel sorts out coarse and fine powders. Only qualified powder enters either the cyclone separator or dust collector for collection. Coarser particles are sent back to the milling chamber for further milling.