application shanghai shibang series of impact crusher is widely applied in mining, transportation, energy, construction and chemical industry. they are ideal choice for crushing and screening. this machine features reasonable structure, high productivity, easy operation and maintenance and safe performance. the most outstanding advantage of this machine is that its finished powder is in good, cubic shape and without tensility and cranny. working principle: this impact crushes materials with impact force. when the materials enter the blow bar area, they are crushed due to the high-speed impact of the blow bar and are thrown to the impact plates on the rotor for secondary crush. then the materials will be shot back to the blow bar again for the third crush. this process repeats until the materials are crushed to the required size and discharged from the lower part of the machine. the size and shape of the finished powder can be changed by adjusting the gap between the impact rack and rotor support. the machine employs self-weigh security device in its back frame. when other objects enter the impact cavity, they will be forced out of the machine by the impact rack in the front and back of the machine.