the pc hammer crusher(hammer mill) crushes by the collisions between high-speed hammer and material, which features in its simple structure, high reduction ration, high efficiency, etc .. the pc hammer crushers(hammer mills) were developed for the both dry and wet crushing of brittle, medium-hard materials for the mining, cement, coal, metallurgic, construction material, road building, and petroleum & chemical industries. the main features of hammer crusher(hammer mill) 1.it is of various types. 2.it is suitable for crushing maximum, medium and minimum stones. 3. it is easy to be operated. 4.the structure is simple and it is easy to maintain.