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Impact crusher is often used as the second stage crushing because it can do well in the fine crushing of ores and stones. In this stage, the requirements on the granularity of materials are very strict. For impact crusher, we usually use it for medium hard and soft materials, merely for crushing hard materials with the compression strength higher than 300MPa. And another reason is that the board hammer and the impact plate of the impact crusher are easy to abrade so that we avoid to use impact crusher to crush hard stones or rocks. In addition, once finding any abrasion on the spare parts, the user should replace new ones.Impact crusher adopts advanced crushing technology so that it has lower electricity consumption. Moreover, impact crusher also can be used to crush concrete in which it shows the advantages of large feeding capacity and high production capacity, etc. With the rapid development of economy and technology, in themobile crushing plant, the impact crusher has the development tendency of replacing of jaw crusher. In the crushing production line, stone materials are crushed by jaw crusher firstly and then crushed by impact crusher to break bulk stone materials into small particles. In fact, the discharging granularity of impact crusher is decided by the distance between the hammerhead and the impact plate. When the impact crusher is working, by the collision between the hammerhead and the stone materials and then rebound to the impact plate, the bulk materials will be crushed into small grains. When the size of the stone is smaller than the gap width between the hammerhead and the impact plate, the stone materials will fall off from the gap and discharge from the discharging mouth. From here, we can know that we can adjust the granularity of the final products by adjusting the gap between the hammerhead and the impact plate.Fote Machinery is a professional manufacturer and reliable supplier of various stone crushers and other mining machinery, if you are interested in our products, please contact us or visit our factory directly.calcium silicate board equipments: http://www.fte-china.com/pro/calcium_silicate_board_machine.html