Grinding disc piece of vertical sand making machine

The utility model belongs to the technical field of sand making machine equipment, and particularly relates to a millstone piece of a vertical sand making machine, which comprises a sand making machine body and a power piece, a grinding mechanism, a blanking piece and a grinding disc piece are arranged in the sand making machine body; the sand making machine aims to solve the problems that most of sand making machines in the prior art are driven by rotating force to move towards the periphery of a millstone through rotating force of the millstone piece, the stone falls into machine-made sand after reaching a grinding mechanism and being ground into machine-made sand by the grinding mechanism, and the machine-made sand falls into a discharging piece and falls into the millstone after being driven by the rotating force of the millstone piece to move towards the periphery. Some machine-made sand which is not completely ground can be disengaged from the grinding piece and fall into the discharging piece under the