Pressure-retaining injection nozzle

• Main Authors: WANG DEJUN, XU ZHIJIANG, ZENG MINGHUI
• Format: Patent
• Language: Chinese; English
• Published: 26.01.2011
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The utility model discloses a pressure-retaining injection nozzle, comprising a fixed nozzle body and a movable nozzle body, wherein the fixed nozzle body is internally provided with an injection runner; the movable nozzle body is sheathed on the fixed nozzle body in a sliding way; the movable nozzle body is internally provided with a pressure-retaining chamber; the front end of the pressure-retaining chamber is communicated with the injection runner; the rear end of the pressure-retaining chamber is provided with an injection switch valve; during the injection process, the injection switch valve is opened; after the injection is finished, the injection switch valve is closed; and the movable nozzle body moves forwards and compresses the volume of the pressure-retaining chamber, thus forming the pressure-retaining effect. Therefore, the pressure-retaining chamber is compressed by utilizing the movable nozzle body to slide relatively to the fixed nozzle body so that the pressure of a plastic fusant is not redu