An expansion mechanism for a plastic hollow container extrusion blow molding machine comprises a plasticizing system, a die head extrusion system, and a blow molding system. The blow molding system includes a blowing mechanism and a mold opening and closing mechanism, which comprises a front mold plate, a middle mold plate, and a rear mold plate. A mold is installed between the front mold plate and the middle mold plate, including two cavities, and a synchronization mechanism is installed between the middle mold plate and the rear mold plate. The middle mold plate is driven by a mold clamping oil cylinder. Material-supporting rod grooves are formed on the inner walls of the two cavities. A base is fixed directly below the mold, connected to a fixed plate via a vertical adjustment device. The fixed plate is equipped with a lifting oil cylinder, whose piston rod is connected to a transverse plate fixing horizontal guide pillars through vertical plates. The vertical plates are fitted with a first expansion oil cylinder and a second expansion oil cylinder, whose piston rods move in opposite directions and are fixed to material-supporting blocks. Material-supporting rods are mounted on the material-supporting blocks and match the material-supporting rod grooves. The two material-supporting blocks are sleeved on the horizontal guide pillars, which are equipped with a blow pin via a blow pin fixing block matching the air hole at the bottom of the mold.
Country Code: CN
Application Number: CN200820162066.0
