Grinding pin conversion tool

The utility model relates to a grinding pin conversion tool, its head are equipped with positioning inner hole and internal thread, are connected with the location excircle and the external screw thread of emery wheel pole afterbody, this grinding pin conversion tool's afterbody is equipped with location excircle and external screw thread, is connected with the positioning inner hole and the internal thread of grinding pin head. Grinding pin's afterbody is equipped with the location excircle and the external screw thread is connected with the grinding machine main shaft. Emery wheel that the head of emery wheel pole bonded carries out the grinding to the hole of outer needle valve. The utility model discloses can adjust grinding pin's grinding length simply to line location is advanced inscrew thread and planar laminating between the passing part spare, realizes the accurate control to extension grinding pin, has promoted grinding pin's during the processing of outer needle valve is produced the rate of utili