Positioning device for machining spark plug hole in cylinder cover

The utility model discloses a positioning device for machining a spark plug hole in a cylinder cover, and relates to the technical field of positioning devices. The lifting device comprises a supporting plate and a lifting rod, a gear disc is installed on the upper surface of the supporting plate and fixedly connected with the supporting plate, a plurality of gear racks are installed on the inner side face of the gear disc, a motor base is arranged on the upper surface of the supporting plate, the gear disc is rotationally connected with an output rod, and an auxiliary gear is installed on the upper surface of the gear disc. A gear ring is installed on the circumferential side face of the rotary disc, the auxiliary gear is meshed with the gear ring, and the auxiliary gear is meshed with the gear strip. By arranging the supporting plate, the gear disc gear rack, the motor base, the output rod, the rotating disc, the containing groove, the output rod, the gear ring, the auxiliary gear, the main laser positioner