Grinding wheel rod for inner grinding head of grinding machine

The utility model provides a grinding wheel rod for an inner grinding head of a grinding machine, which relates to the technical field of grinding wheel rods and comprises a crankshaft, a box body is fixedly mounted at the top end of the crankshaft, a concave table is fixedly mounted at the center of an inner cavity of the box body, an inner cavity of the concave table is connected with a grinding wheel rod main body, and a fixing device is arranged at the top end of the grinding wheel rod main body. According to the grinding wheel rod, the grinding wheel rod body is placed in the concave table, an external controller is used for starting the automatic telescopic rod so that the automatic telescopic rod can enter the second holes formed in the two sides of the grinding wheel rod body through the first holes formed in the two sides of the concave table, and the baffle at the bottom end of the second connecting plate is placed in the groove; a third threaded hole and a first threaded hole in a second connecting