Scope of Application: Suitable for crushing dry powder materials such as refractory materials, building materials, abrasives, ceramics, chemicals, pharmaceuticals, food, and pesticides. Principle: Compressed gas is accelerated into a supersonic airflow through a nozzle and injected into the crushing chamber. The materials in the crushing chamber are transported by the airflow to the classification zone, where the classification wheel separates fine powders of the required fineness. Coarse powders that do not meet the requirements are returned to the grinding zone for further grinding. The fine powders, carried by the airflow, enter the collector for collection and packaging. The air is filtered and then discharged into the atmosphere.