A head lifting device for an extrusion mechanism of a plastic extrusion blow molding machine comprises a frame, on which an extrusion mechanism and a blow molding mechanism are installed. The extrusion mechanism comprises a hydraulic motor mounted on an extrusion support, the hydraulic motor drives a screw, the screw is installed in a barrel, and the barrel is connected with a die head. The blow molding mechanism comprises a blowing mechanism, a mold plate and a mold opening and closing mechanism, and a mold is installed in the mold plate. A cross beam is installed at the rear part of the extrusion support, the hydraulic motor is mounted on the cross beam, a head lifting cylinder is installed in the frame, a connecting block is mounted on the piston rod of the head lifting cylinder, a guide pin passes through the connecting block, one end of the guide pin is connected to the barrel, a guide groove is installed on one side of the cylinder body of the head lifting cylinder, and the other end of the guide pin is matched with the guide groove. In this technical solution, the continuously extruded material hangs vertically without bending, so that the mouth of the molded product is flat with less scrap, saving materials. With the cooperation of the guide pin and the guide groove, the die head of the extrusion mechanism is positioned accurately when lowered after being lifted, ensuring reliable matching between the extrusion port of the die head and the mold.
Country Code: CN
Application Number: CN200910100155.1
