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Wear is the gradual destruction of material surface, at the same time, the separation of material particles, the transfer of particles to adjacent parts, the change of mechanical properties and geometry of material layer near the surface. The crusher will wear more or less in the use process. In order to avoid the negative impact on the crusher, it is necessary to find a solution in advance. Crusher wear types: mainly divided into natural wear, premature wear, mechanical wear, thermal wear, corrosion wear five categories. Natural wear: usually refers to the size change of the parts formed in the long-term operation of the crusher. The change of the part geometry caused by the wear of the crusher will increase the gap between the directly adjacent parts. Premature wear: at this time, the crusher and its individual parts are temporarily damaged, which is caused by the following factors: the crusher is defective, the quality of parts and materials is poor (cracks, sand holes,...