Grinding device for preparing calcium aluminate powder by dry method

The utility model discloses a grinding device for preparing calcium aluminate powder by a dry method, which comprises a box body, a driving mechanism is arranged in the box body, a grinding roller is fixedly mounted at the output end of the driving mechanism, a filter plate is mounted in the box body in a hinged manner, and a collecting box is mounted in the box body in a sliding manner. A partition plate is fixedly mounted in the box body and collides with a filter plate under the action of gravity, calcium aluminate powder falls into a collecting box through filter holes, calcium aluminate fragments enter a conveying barrel under the action of a flow guide plate, the output end of a conveying motor rotates to drive a spiral conveying paddle to rotate, and the calcium aluminate fragments in the conveying barrel are driven to move upwards; calcium aluminate enters a feeding port through a conveying branch pipe and is ground again through a grinding roller, so that calcium aluminate is ground more sufficiently