Crusher

The invention relates to the field of engineering equipment, in particular to a crusher. The crusher comprises a support, a shell fixed to the support and a crushing mechanism arranged in the shell. The crushing mechanism comprises an extrusion core and a main shaft eccentrically arranged on one side of the extrusion core. The extrusion core is in the shape of a Reuleaux triangle, a groove is formed in the other side of the extrusion core, inner teeth are arranged in the groove, and a gear matched with the inner teeth is fixed to the center of an end face of one side of the shell. A through hole is formed in the bottom of the shell, the shape of the side face of the shell is consistent with the moving track of the tip of the extrusion core, and a gap exists between the side face of the shell and the moving track of the tip of the extrusion core. The diameter of the gear is smaller than that of the groove. The main shaft is superposed to the axis of the gear. According to the crusher, three-time extrusion crus