The present utility model discloses a reliable automatic mold clamping device for an injection blow molding machine, comprising a movable template, in which at least one piston mechanism movably connected with an upper mold and parallel to the moving direction of the upper mold is arranged. The piston mechanism comprises a piston hole arranged in the movable template, a piston is movably arranged in the piston hole, a sealing cover for sealing the piston hole is arranged on the movable template, a first sealing ring is arranged between the sealing cover and the piston, and a second sealing ring is arranged between the sealing cover and the movable template. A separating ring whose outer periphery matches the wall of the piston hole is arranged on the piston, a third sealing ring is arranged between the separating ring and the movable template, a first oil inlet and outlet pipe communicating with a chamber between the separating ring on the piston and the bottom wall of the piston hole is arranged on the movable template, and a second oil inlet and outlet pipe communicating with a chamber between the separating ring on the piston and the sealing cover is arranged on the movable template. The end of the piston is connected with the upper mold of the blow molding machine forming mold.

Country Code: CN

Application Number: CN202022500026.6