Forge piece grinding machine

The utility model discloses a forge piece grinding machine which comprises a machine frame, a grinding belt is arranged on one side of the machine frame, a collecting box fixed to the machine frame is arranged at the bottom of the grinding belt, a centrifugal fan is fixed to the outer wall of one side of the collecting box, a box body is fixed to the interior of the machine frame, and a filtering assembly is fixed to the interior of the box body. An air outlet of the centrifugal fan is connected with the box body through a pipeline, the filtering assembly comprises a threaded ring connected with the box body through threads, a filtering cylinder is fixed to one end of the threaded ring, a fixing ring connected to the outer portion of the filtering cylinder in a sleeving mode is fixed to the inner wall of the box body, and bristles are fixed to the inner wall of the fixing ring and make contact with the filtering cylinder. Metal powder generated during forging polishing is conveyed into the box body through th