Ball surface grinding device for ball valve machining

The utility model provides a ball surface polishing device for ball valve machining, and relates to the field of valve machining. The utility model discloses a ball surface grinding device for ball valve machining. The device comprises a grinding box, a grinding groove is formed in the upper surface of the grinding box; supporting mechanisms are fixedly mounted at the left and right ends of the inner bottom wall of the grinding groove; the supporting mechanism comprises a supporting rod, the bottom end of the supporting rod is fixedly installed on the inner wall of the grinding box, a slidinggroove is formed in the surface of the supporting rod, a compression spring is fixedly connected into the sliding groove, a semi-ring sleeve is fixedly installed at the top end of the compression spring, a rotating shaft is rotationally connected between the semi-ring sleeve and the inner wall of the sliding groove, and the outer surface of the rotating shaft is fixedly sleeved with a rotating sleeve. According to the bal