Shut-off nozzle of vertical injection molding machine, injection device, and vertical injection molding machine

An injection device, comprising:

• a heating cylinder provided vertically;
• a screw provided in the heating cylinder;
• and
• a shut-off nozzle provided in a lower part of the heating cylinder, the shut-off nozzle including:
• a nozzle portion having an injection flow path in an axial direction formed therein and a needle hole reaching the injection flow path from an outer peripheral surface of the nozzle portion;
• a needle valve movably inserted into the needle hole to open and close the injection flow path;
• a cylinder component configured to drive the needle valve in a moving direction;
• a bracket configured to rotatably support the cylinder component at a rear end;
• a fixing device configured to fix the bracket to a fixing member fixed to the heating cylinder;
• and
• a slide position adjustment mechanism configured to adjust a slide position of the bracket with respect to the fixing member,
• wherein in a state where the fixing device is released, the bracket is allowed to slide by a predetermined width with respect to the fixing member, allowing the slide position of the bracket to be adjusted by the slide position adjustment mechanism,
• wherein the slide position adjustment mechanism includes:
• a base portion fixed to the fixing member;
• and
• one or a plurality of slide position adjustment bolts each having a head portion and a tip end portion, and
• wherein the slide position adjustment bolt is screwed into a female screw formed on the base portion with the head portion facing downward and the tip end portion protruding from the base portion to press against an end of the bracket, allowing the slide position of the bracket to be adjusted by adjusting a length of a male screw protruding from the base portion.

A vertical injection molding machine comprising:

• a vertical mold clamping device configured to clamp a mold,
• a vertical injection device configured to inject an injection material, the injection device including:
• a heating cylinder provided vertically;
• a screw provided in the heating cylinder;
• and
• a shut-off nozzle provided in a lower part of the heating cylinder, the shut-off nozzle including:
• a nozzle portion having an injection flow path in an axial direction formed therein and a needle hole reaching the injection flow path from an outer peripheral surface of the nozzle portion;
• a needle valve movably insertable into the needle hole to open and close the injection flow path;
• a cylinder component configured to drive the needle valve in a moving direction;
• a bracket configured to rotatably support the cylinder component at a rear end;
• a fixing device configured to fix the bracket to a fixing member fixed to the injection device;
• and
• a slide position adjustment mechanism configured to adjust a slide position of the bracket with respect to the fixing member,
• wherein the bracket is allowed to slide by a predetermined width with respect to the fixing member in a state where the fixing device is released, allowing the slide position of the bracket to be adjusted by the slide position adjustment mechanism,
• wherein the slide position adjustment mechanism includes:
• a base portion fixed to the fixing member;
• and
• one or a plurality of slide position adjustment bolts each having a head portion and a tip end portion, and
• wherein the slide position adjustment bolt is screwed into a female screw formed on the base portion with the head portion facing downward and the tip end portion protruding from the base portion to press against an end of the bracket, allowing the slide position of the bracket to be adjusted by adjusting a length of a male screw protruding from the base portion.

An adjustment method for a shut-off nozzle of a vertical injection molding machine,

• the shut-off nozzle including:
• a nozzle portion attached to a lower part of a vertical injection device of the vertical injection molding machine, the nozzle portion having an injection flow path in an axial direction formed therein and a needle hole reaching the injection flow path from an outer peripheral surface of the nozzle portion;
• a needle valve movably inserted into the needle hole to open and close the injection flow path;
• a cylinder component configured to drive the needle valve in a moving direction;
• a bracket configured to rotatably support the cylinder component at a rear end,
• a fixing device configured to fix the bracket to a fixing member fixed to the injection device;
• and
• a slide position adjustment mechanism configured to adjust a slide position of the bracket with respect to the fixing member,
• the adjustment method comprising:
• releasing the fixing device to allow the bracket to slide by a predetermined width with respect to the fixing member;
• heating the injection device and the nozzle portion by a heater;
• adjusting the slide position of the bracket by the slide position adjustment mechanism to bring the needle valve to reach a prescribed forward position in a state where a fluid is supplied to the cylinder component to apply a driving force in a forward direction to the needle valve;
• and
• fixing the bracket to the fixing member by the fixing device,
• wherein the slide position adjustment mechanism includes:
• a base portion fixed to the fixing member;
• and
• one or a plurality of slide position adjustment bolts each having a head portion and a tip end portion, and
• wherein the slide position adjustment bolt is screwed into a female screw formed on the base portion with the head portion facing downward and the tip end portion protruding from the base portion to press against an end of the bracket, allowing the slide position of the bracket to be adjusted by adjusting a length of a male screw protruding from the base portion.