The ultrafine mechanical crusher, also known as the air grading mill, is a fine impact crusher that integrates grading and crushing. By adjusting the grading wheel, grinding rotor shape, rotor speed, etc., the grinding size of the product can be flexibly controlled, and products with an average particle size of 10-100 μ m can generally be produced. According to the requirements of material characteristics, different PLC automation programs can be set up, and customized selection and manufacturing can be carried out.