The main working part of hammer crusher is rotors with hammer. The rotors consist of main shaft, disk, pin shaft and hammers. The motor drives the rotors to rotate quickly in the crushing cavity. Raw materials enter the crusher through the feed opening and are crushed to small sizes by the high-speed hammer , with the process of pressing, impacting , cutting and grinding. There is a screening plate under the rotor, which make sure the materials with size smaller than the screen mesh will be screened out and others will be left to be further hammered and ground until they fulfill the standard size. The size of the final products can be adjusted by changing the screening plate. The gap between the rotors and the screening plate can also be adjusted according to different requirements.