Precise positioning device for cylindrical grinder

The utility model discloses an accurate positioning device for a cylindrical grinder, which belongs to the technical field of cylindrical grinding and comprises a positioning disc, four groups of bumps are circumferentially distributed on the outer side wall of the positioning disc at equal intervals, electric push rods are mounted on the bumps, a mounting plate is fixed at the output ends of the electric push rods, and a vacuum pump is fixed at the bottom end of the mounting plate. By designing a group of auxiliary supporting mechanisms consisting of the electric push rod, the mounting plate, the vacuum pump and the sucking disc, when the specification difference between a workpiece and the positioning disc is large, the position of the sucking disc can be adjusted through the electric push rod; and then the workpiece is adsorbed and supported through a vacuum pump and a suction cup, so that the stability of the workpiece is guaranteed by increasing the supporting area of the workpiece, the workpiece is prev