Coarse crushing device

The utility model provides a coarse crushing device which comprises a crushing bin, a cooling mechanism externally connected with the crushing bin is used for providing a cooling medium for the crushing bin, a crushing mechanism is arranged in the crushing bin, and the crushing mechanism comprises a first hollow shaft, a second hollow shaft and a driving assembly. The driving assembly is used for driving the first hollow shaft and the second hollow shaft to rotate synchronously. The peripheral wall of the first hollow shaft is sleeved with a plurality of annular first shear knives, the first shear knives and the first hollow shaft are eccentrically arranged, the peripheral wall of the second hollow shaft is sleeved with a plurality of annular second shear knives, and the second shear knives and the second hollow shaft are eccentrically arranged; and a first cooling pipe and a second cooling pipe are arranged in the first hollow shaft and the second hollow shaft correspondingly, the first cooling pipe and the