It is a kind of hammer mill, mainly used in coal, chemicals, mineral, cement, metallurgy, building materials industries etc. It can crush pulverized coal, coal gangue, limestone, stove ash, rocks, there is screen cloth at the bottom, which can control its discharging-material size less than 3mm, 80% of them is less than 2mm. Mass production, good crushing performance, flexibility, stable and simple structure, together with a material output device, made the crusher the preferred equipment to small and medium-sized coal factory.