Adjustment method for shut-off nozzle, shut-off nozzle, injection device, and injection molding machine

1 . An adjustment method for a shut-off nozzle provided in an injection device,

the shut-off nozzle comprising:

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; and

a fixing device configured to fix the bracket to a fixing member of the injection device,

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;

driving the cylinder component to bring the needle valve to a most forward position and adjusting a slide position of the bracket; and

fastening the fixing device to fix the bracket to the fixing member,

wherein a knock pin is fixed to the fixing member, and the bracket has an elongated guide hole into which the knock pin is inserted, regulating a direction in which the bracket slides with respect to the fixing member in a state where the fixing device is released.

2 . The adjustment method for a shut-off nozzle according to claim 1 ,

wherein the fixing device is a fastening bolt, and the releasing of the fixing device is to loosen the fastening bolt,

wherein a fastening bolt hole through which a shaft portion of the fastening bolt passes is formed in the bracket, and

wherein the fastening bolt hole is formed as a hole having a diameter larger than a diameter of the shaft portion or as an elongated hole.

3 . The adjustment method for a shut-off nozzle according to claim 1 ,

wherein a head portion of the needle valve is formed in a hemispherical shape, and a tip end portion of the needle hole is formed in a spherical recess, and

wherein the head portion is configured to be seated on the recess in a case where the needle valve is brought to the most forward position in the driving of the cylinder component.

4 . The adjustment method for a shut-off nozzle according to claim 1 ,

wherein the shut-off nozzle includes:

a vertical distance adjustment device configured to adjust a vertical distance, the vertical distance being a distance between the fixing member and the rear end of the cylinder component in a direction perpendicular to the axial direction,

wherein the adjustment method further includes:

adjusting the vertical distance by the vertical distance adjustment device, and

wherein the adjusting of the vertical distance is performed after the driving of the cylinder component is performed, and then the fastening of the fixing device is performed.

5 . The adjustment method for a shut-off nozzle according to claim 4 ,

wherein the vertical distance adjustment device includes a vertical distance adjustment bolt, the vertical distance adjustment bolt being screwed into a nut portion provided in the bracket, and a tip end of the vertical distance adjustment bolt protruding from the bracket and being in contact with the fixing member, and

wherein in the adjusting of the vertical distance, the vertical distance is adjusted by adjusting a length of the vertical distance adjustment bolt protruding from the bracket.

6 . A shut-off nozzle comprising:

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; and

a fixing device configured to fix the bracket to a fixing member of an injection device,

wherein a knock pin is fixed to the fixing member, and the bracket has an elongated guide hole into which the knock pin is inserted, and

wherein in a case where the fixing device is released, the bracket is allowed to slide by a predetermined width with respect to the fixing member with a slide direction thereof being regulated by the knock pin, and the bracket is configured to be fixed to the fixing member by the fixing device at any slide position.

7 . The shut-off nozzle according to claim 6 ,

wherein the fixing device includes a fastening bolt,

wherein a fastening bolt hole through which a shaft portion of the fastening bolt passes is formed in the bracket, and

wherein the fastening bolt hole is formed as a hole having a diameter larger than a diameter of the shaft portion or as an elongated hole.

8 . The shut-off nozzle according to claim 6 ,

wherein a head portion of the needle valve is formed in a hemispherical shape, a tip end portion of the needle hole is formed in a spherical recess, and

wherein the head portion is configured to be seated on the recess in a case where the needle valve is driven to a most forward position.

9 . The shut-off nozzle according to claim 6 , wherein the shut-off nozzle includes:

a vertical distance adjustment device configured to adjust a vertical distance, the vertical distance being a distance between the fixing member and the rear end of the cylinder component in a direction perpendicular to the axial direction.

10 . The shut-off nozzle according to claim 9 ,

wherein the vertical distance adjustment device includes a vertical distance adjustment bolt, the vertical distance adjustment bolt being screwed into a nut portion provided in the bracket, a tip end of the vertical distance adjustment bolt protruding from the bracket and being in contact with the fixing member, and

wherein the vertical distance is configured to be adjusted by adjusting a length of the vertical distance adjustment bolt protruding from the bracket.

11 . An injection device comprising:

a heating cylinder;

a screw provided in the heating cylinder; and

a shut-off nozzle provided in 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; and

a fixing device configured to fix the bracket to a fixing member of the injection device,

wherein a knock pin is fixed to the fixing member, and the bracket has an elongated guide hole into which the knock pin is inserted, and

wherein in a case where the fixing device is released, the bracket is allowed to slide by a predetermined width with respect to the fixing member with a slide direction thereof being regulated by the knock pin, and the bracket is configured to be fixed to the fixing member by the fixing device at any slide position.

12 . The injection device according to claim 11 ,

wherein the fixing device includes a fastening bolt,

wherein a fastening bolt hole through which a shaft portion of the fastening bolt passes is formed in the bracket, and

wherein the fastening bolt hole is formed as a hole having a diameter larger than a diameter of the shaft portion or as an elongated hole.

13 . The injection device according to claim 11 ,

wherein a head portion of the needle valve is formed in a hemispherical shape, a tip end portion of the needle hole is formed in a spherical recess, and

wherein the head portion is configured to be seated on the recess in a case where the needle valve is driven to a most forward position.

14 . The injection device according to claim 11 , wherein the shut-off nozzle includes:

a vertical distance adjustment device configured to adjust a vertical distance, the vertical distance being a distance between the fixing member and the rear end of the cylinder component in a direction perpendicular to the axial direction.

15 . The injection device according to claim 14 ,

wherein the vertical distance adjustment device includes a vertical distance adjustment bolt, the vertical distance adjustment bolt being screwed into a nut portion provided in the bracket, a tip end of the vertical distance adjustment bolt protruding from the bracket and being in contact with the fixing member, and

wherein the vertical distance is configured to be adjusted by adjusting a length of the vertical distance adjustment bolt protruding from the bracket.

16 . An injection molding machine comprising:

a mold clamping device configured to clamp a mold; and

an injection device configured to inject an injection material, the injection device including:

a heating cylinder;

a screw provided in the heating cylinder; and

a shut-off nozzle provided in 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; and

a fixing device configured to fix the bracket to a fixing member of the injection device,

wherein a knock pin is fixed to the fixing member, and the bracket has an elongated guide hole into which the knock pin is inserted, and

wherein in a case where the fixing device is released, the bracket is allowed to slide by a predetermined width with respect to the fixing member with a slide direction thereof being regulated by the knock pin, and the bracket is configured to be fixed to the fixing member by the fixing device at any slide position.