| 摘要 |
A device for opening and closing a plastic injection nozzle comprises a needle mounted on a piston plate moving in a cylindrical chamber of a cylinder plate and dividing it into two separate fluid-fed working compartments. There is a seal between the inner wall of the cylindrical chamber and the piston plate. A second seal is between the needle and the wall of an opening through a piston plate. A device for opening and closing a plastic injection nozzle comprises a needle (25) mounted on a piston plate (17) moving in a cylindrical chamber of a cylinder plate (11) and dividing it into two separate fluid-fed working compartments (18,19). Fluid tightness of the second chamber(19) is ensured by a seal (22) between the inner wall of the cylindrical chamber (12) and the piston plate. A second seal (32) is located between the needle and the wall of an opening (31) through a piston plate. |
