Hub clamping device

The utility model discloses a hub clamping device which comprises a frame structure, the frame structure comprises four fixing frames, clamping structures are arranged on one sides of two of the fixing frames, each clamping structure comprises two threaded rods, the surfaces of the two threaded rods are in threaded connection with internal thread movable blocks, a first hinge is installed on each internal thread movable block, and a second hinge is installed on each internal thread movable block. The internal thread movable block is connected with a fixed rod through a hinge I, and the tail end of the fixed rod is connected with a fixed block through a hinge II. A complete clamping device is formed through the frame structure, the clamping structure and the moving structure, and an electric push rod in the frame structure can enable the whole fixed frame to stretch out and draw back; according to the clamping structure, a threaded rod rotates through a motor to drive an internal thread movable block to move,