Crushing cavity of sand making machine

The utility model discloses a sand making machine crushing cavity which comprises a sand making machine working tank, the sand making machine working tank is of a hollow circular pipe structure, an upper baffle is installed at the upper end of the sand making machine working tank in a bolting mode, and a connecting pipe is installed at the top end of the sand making machine working tank in a bolting mode. And a group of peripheral protection plates are mounted on the inner wall of the sand making machine working tank in an attached mode, a plurality of groups of upper grinding discs are mounted on the lower side of an upper baffle in a bolting mode, and a plurality of groups of lower grinding discs are mounted on the upper surface of a connecting pipe in a bolting mode. A crushing cavity is protected through an upper grinding disc bolted to the lower surface of an upper baffle in an equal-radian mode and a lower grinding disc bolted to the upper surface of a connecting pipe in an equal-radian mode, and it is