Crusher

The utility model relates to the field of engineering equipment, in particular to a crusher which comprises a support, a shell fixed to the support and a crushing mechanism arranged in the shell. Thecrushing mechanism comprises an extrusion core and a main shaft eccentrically arranged on one side of the extrusion core; the extrusion core is of a Lyocell triangle shape, 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 the 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. The diameter of the gear is smaller thanthat of the groove; and the main shaft is overlapped with the axis of the gear. Three times of extrusion crushing can be realized by rotating the extrusion core for one circle, so that the crushing efficiency is greatly improv