Impact crusher is a crushing machine that uses impact energy to crush materials. When the machine is working, driven by the motor, the rotor rotates at a high speed. When the material enters the action area of the plate hammer, it will collide with the plate hammer on the rotor and be broken, and then be thrown to the counterattack device to be broken again, and then it will be broken again from the counterattack lining plate. It bounces back to the action area of the blow hammer to be broken again. This process is repeated. The material enters the first, second, third and counterattack chambers from large to small for repeated crushing until the material is broken to the required particle size and discharged from the discharge port.