Hammer crusher crushes materials mainly by impact. The crushing process is roughly like this. When material enters the crusher, it is crushed by the impact of the high-speed rotating hammer head. The crushed material obtains kinetic energy from the hammer head and rushes from the high-speed to the baffle and screen in the frame. At the same time, the material collides with each other and is crushed many times, less than the gap between the sieve bars, and from the gap. Some larger materials are discharged in the sieve bar and then crushed by impact, grinding and extrusion of the hammer head. The material is extruded by the hammer head from the gap.