Hub grinding auxiliary device

The utility model relates to the technical field of hub machining equipment, in particular to a hub grinding auxiliary device which comprises a base, an extending frame is arranged on the outer side of the base, a clamping table is connected to the top of the extending frame, a middle column is arranged on the inner side of the extending frame, and when a hub is placed on the clamping table, a hub middle hole can be arranged on the top of the middle column in a sleeved mode. A plurality of sinking grooves are symmetrically formed in the top of the middle column, clamping blocks are arranged in the sinking grooves, rotating shafts pivoted to the side walls of the sinking grooves are arranged on the two sides of the bottom of each clamping block, the rotating shafts are sleeved with torsion springs, the inner side walls of the clamping blocks are inclined planes, an air cylinder is arranged at the bottom of the middle column and connected with external air compression equipment, and a telescopic rod of the air