Features: 1. It's available to increase the productivity, decrease the energy consumption and reduce tear to the vulnerable parts caused by the over fine material and the life of the vulnerable can be extended more than 30% compared with common vulnerable ones. 2. The crushing interspaces is adjustable by the use of a constant instruct in the movable striking board so as a stable fine crushing is formed and the life of crushing hammer is extended since then. 3. Dust equipment is unnecessary since there is a high efficiency dust system inside and few dust pollution when it's working. 4. Normal operation of crusher can be well guaranteed because of the simplicity of the maintenance is available.