Roller bar outer circle trimming machine

The utility model relates to the technical field of silicon carbide roller bar production, and discloses a roller bar outer circle trimming machine which comprises a workbench, a cleaning assembly, four positioning rings and four fourth bearing seats, an electric guide rail is fixedly arranged on one side of the upper end face of the workbench, and a machine body is arranged in the middle of the upper end of the electric guide rail in a sliding mode. Fixing blocks are fixedly arranged at the front end and the rear end of the middle of the upper end face of the workbench, a baffle is fixedly arranged on the opposite sides of the two fixing blocks, bearing sleeves are embedded in the middles of the two fixing blocks, and a driving motor is fixedly arranged in the middle of the front end face of one of the two fixing blocks. A containing groove is formed in the position, between the fixing blocks, of the upper end face of the workbench, a discharging groove is formed in the middle of the front end face of the wo