Impact crusher is a use of impact energy to break material of broken machinery. When the machine works, under the driving of the motor, the rotor high-speed rotation, the material into the plate hammer action zone, and the rotor plate hammer crushing crash, and was thrown back device is broken again, and then from the counterattack scaleboard bomb on the back plate hammer crushing zone again, this process is repeated, material from large to small in one or two, three back cavity is repeated until the material being broken broken, to a desired size, by the discharge port. Adjust the back frame and the clearance between rotor can change material material particle size and shape of the material. Stone from top of the machine directly into the high-speed rotating turntable; under the function of high-speed centrifugal force, and the other part with umbrella type shunt in the surrounding rocks from a high-speed collision with a high density of crushed stone in, against each other, and the turntable and the casing is formed between the vortex motion caused many mutually blow, friction, crushing, from the lower part through discharge. The formation of closed cycle of repeated, by screening equipment control to achieve the required particle size.