Impact crusher is mainly used for breaking crisp material under impact force. Compared with jaw crusher, cone crusher and roller crusher, impact crusher has these features as follows:

A．It has big breaking ratio over *0, while that of the crushers mentioned above is difficult to exceed *0.

B．It can obtain good final grain size. Under impact force, the material usually is broken along the weakest layer, so it can obtain cubic grain size with high probability and needle grain size less than *0% compared with over *5% of other crushers. With cubic grain size, impact crusher is used as final crusher for processing concrete bone material in the road-building.

With good features mentioned above, impact crusher plays an important role among other crushers. But it also has drawbacks, for example, the wear parts such as plate hammer, impact plate are subject to abrasion.

In order to overcome above drawbacks, the newly designed crusher by our company has perfected structure of rotor and improved clamping method of plate hammer which is made of by high-wear material suitable for breaking hard rock. As per the purpose of usage, such impact crusher has three types namely I, II and III. Type I is suitable for breaking material with medium hardness, and type II and III are used for hard-rock with anti-pressure strength up to **0MPa such as basalt and andesite which shall be crushed to grading stone material less than *9.6mm. At present, such crusher has been used in many road construction projects.