Worm assembly device

The utility model discloses a worm assembly device for mounting a worm on a motor shaft of a motor. The worm assembly device comprises a lower tooling component, a clamp plate component and an upper tooling component, wherein the lower tooling component comprises a tooling seat for allowing the motor to be fixed thereon and a first pressure sensor for detecting the stress at the bottom of a motor casing; the clamp plate component comprises a clamping jaw for clamping the motor shaft; and the upper tooling component comprises a guiding spring pin suitable for receiving the worm, a guide pole connected above the guiding spring pin and a first position sensor for detecting a pressing position. In the utility model, the guiding spring pin is used to ensure the accurate positioning of a tooling; meanwhile, the casing inductive pressure sensor is used for monitoring the stress condition of the motor, so as to prevent a gasket in the motor from damage.