Positioning mechanism for welding fixture

The positioning mechanism comprises a base plate, mounting grooves are formed in the positions, close to the corners, of the top of the base plate, connecting openings are symmetrically connected to the positions, close to the side walls, of the front wall of the base plate in a threaded mode, a clamp is tightly attached to the top of the base plate, and connecting pins are arranged at the corners of the clamp in a penetrating mode. Moving plates are arranged at the inner bottoms of the two mounting grooves in an attached mode, fixing rods are fixedly connected to the centers of the tops of the two moving plates, springs wrap the outer walls of the two fixing rods, and a plurality of balls are arranged at the positions, close to the tops, of the side walls of the two fixing rods; vent holes are formed in the centers of the bottoms of the two mounting grooves correspondingly, rubber pads are arranged on the outer walls of the two moving plates correspondingly, and the rubber pads are attached to the inner wall