Automatic clamping tool of three-piece type rim spinning machine

The invention provides an automatic clamping tool of a three-piece type rim spinning machine, and relates to the technical field of rim machining. The tool comprises a main shaft flange plate, one end of the main shaft flange plate is used for being connected with a main shaft of the spinning machine, and the other end of the main shaft flange plate is used for being connected with a spinning die left die; the transmission module is arranged on the main shaft flange plate; the pulling claw is rotatably connected to the spinning die left die, the first end of the pulling claw is matched with the transmission module, and the second end of the pulling claw is used for locking the workpiece to be spun to the spinning die left die; and the pushing piece is used for being connected with the spinning die right die, the spinning die right die can drive the pushing piece to move, and the pushing piece can enable the pull claw to rotate through the transmission module. The automatic clamping tool of the three-piece typ