Roller of ball grinder

The utility model discloses a roller of a ball grinder. The roller comprises a barrel, a barrel cover, a limiting device, a T-shaped fastening device and a support device, wherein a feeding hole is formed in the barrel; the barrel cover is arranged in the barrel and shields the feeding hole; the limiting device is fixed on the outer side surface of the barrel cover; a cavity is formed in the limiting device; a first opening communicated with the cavity is formed in the side part of the limiting device; a second opening communicated with the cavity is formed in the top of the limiting device; the T-shaped fastening device comprises a baffle block and a screw; the baffle block enters the limiting device through the first opening; the screw penetrates out of the limiting device through the second opening; the screw is fixedly connected with the baffle block; an outer thread is formed on the screw; the bottom end of the support device abuts against the outer wall of the barrel; and a screw hole is formed in the top end and is matched with the screw. The roller of the ball grinder, disclosed by the utility model, is simple in structure, reliable and practical, and effective sealing of the feeding hole of the ball grinder can be achieved.