Operating principle: The electric motor drives the eccentric shaft by belt pulley to make moving jaw toothed plate move upward and downward, so as to push the moving jaw toothed plate to the fixed jaw toothed plate, to crush the material or splitting the material by doing reciprocating motion of approaching and leaving. Characteristics: The machine has such characteristics as big ratio of crushing, Products size homogeneous, simple structure, and convenient maintenance.It can crush various materials of which strength is not more than 320 MPA, and is the first choice equipment in the time of primary crushing.