Grinding device for plug valve

The utility model discloses a grinding device for a plug valve, and mainly solves the problems of low work efficiency and poor machining quality when the sealing surface of the plug valve is ground artificially. The grinding device for the plug valve is characterized in that a cover board (3) is connected with a bracket (7), a speed reduction box (8) and a power source (9) in sequence; the output shaft of the speed reduction box (8) is connected with a plane cam plate (10); closed and symmetric wave-shaped cam grooves (11) are formed in the circumferential direction in the side wall of the plane cam plate (10); the upper end of a lower shaft (2) is connected with an upper shaft (13) through a coupling mechanism (12); a shaft pin (14) radially penetrates through the upper end of the upper shaft (13); the two ends of the shaft pin (14) extend out and are arranged in the cam grooves (11) of the plane cam plate (10) in a coinciding manner; and an anti-rotation plate (15) is fixed on the upper shaft (13). The grin