GAS EXTRACTION STRUCTURE FOR MOLD

Abstract

A gas extraction structure (40) is used for a mold apparatus (100). The gas extraction structure connects with a mold cavity (300). The mold cavity includes an end portion of a plastic injection path (210). The gas extraction structure includes a gas vent (490), a gas vent pin (49), and a support structure (40). The gas vent communicates with the end portion of the plastic injection path. The gas vent pin received in the gas vent. The support structure is fixed with the gas vent pin and brings the gas vent pin to move in the gas vent.

Description

BRIEF DESCRIPTION OF THE DRAWING

The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present gas extraction structure. Moreover, in the drawing, like reference numerals designate corresponding parts.

FIG. 1 is a partial cross-sectional view of a mold apparatus including a gas extraction structure in accordance with one embodiment of the present invention.

Claims

1. A gas extraction structure for a mold apparatus, the gas extraction structure configured to be connected to a mold cavity, the mold cavity including an end portion of a material injection path, the gas extraction structure comprising: a gas vent configured to communicate with the end portion of the material injection path;a gas vent pin movably received in the gas vent; anda support structure attached to an end of the gas vent pin that is configured to be distal from the end portion of the material injection path, the support structure configured to drive the gas vent pin to a position where an opposite end of the gas vent pin is adjacent to the end portion of the material injection path.

2. The gas extraction structure as claimed in claim 1, wherein the gas vent includes a connecting aperture, a diameter of the connecting aperture is smaller than that of a main portion of the gas vent, and the connecting aperture is configured to intercommunicate the main portion of the gas vent and the end portion of the material injection path.

3. The gas extraction structure as claimed in claim 2, wherein a diameter of the gas vent pin is slightly smaller than that of the connecting aperture, and smaller than that of the main portion of the gas vent.

4. The gas extraction structure as claimed in claim 1, wherein the support structure includes a support plate, and the gas vent pin is attached to the support plate.

5. The gas extraction structure as claimed in claim 1, wherein the support structure includes a first support plate and a second support plate, and the first support plate and the second support plate cooperatively support the gas vent pin.

6. A mold apparatus comprising: an upper mold; a lower mold cooperating with the upper mold to define a mold cavity therebetween, wherein the mold cavity includes an end portion of a material injection path;a gas vent communicating with the end portion of the material injection path;a gas vent pin movably received in the gas vent; anda support structure attached to the gas vent pin and configured to drive to the gas vent pin to move in the gas vent to a position where an end of the gas vent pin is adjacent to the end portion of the material injection path.

7. The mold apparatus as claimed in claim 6, wherein the gas vent includes a connecting aperture, a diameter of the connecting aperture is smaller than that of the gas vent, and the connecting aperture connects the gas vent and the mold cavity.

8. The mold apparatus as claimed in claim 7, wherein a diameter of the gas vent pin is slightly smaller than that of the connecting aperture, and smaller than that of the main portion of the gas vent.

9. The mold apparatus as claimed in claim 6, wherein the support structure includes a support plate, and the gas vent pin is attached to the support plate.

10. The mold apparatus as claimed in claim 6, wherein the support structure includes a first support plate and a second support plate, the first support plate and the second support plate together support the gas vent pin.

11. The mold apparatus as claimed in claim 10, further comprising an ejector structure positioned under the lower mold.

12. The mold apparatus as claimed in claim 11, wherein the ejector structure includes a first ejector plate, a second ejector plate, and a plurality of ejector pins, and the ejector pins are attached on the first ejector plate and the second ejector plate.

13. The mold apparatus as claimed in claim 12, wherein the support structure further comprises at least one rod, and the at least one rod is positioned generally between the first support plate and the second ejector plate.

14. The mold apparatus as claimed in claim 13, wherein the second ejector plate defines at least one guide hole, and one end of the at least one rod is movably received in the at least one guide hole.

15. The mold apparatus as claimed in claim 14, further comprising at least one spring, wherein the at least one spring is located around the at least one rod between the first support plate and the second ejector plate.

16. A gas extraction structure comprising: a mold cavity having an end portion of a material injection path;a gas vent generally adjacent to the end portion of the material injection path;a connecting aperture interconnecting the gas vent and the end portion;a pin movably received in the gas vent; anda support structure fixed to the gas vent pin distal from the connecting aperture, the support structure configured to drive the pin between a first position in which the connecting aperture is clear and a second position in which the pin occupies the connecting aperture and is adjacent to the end portion of the material injection path.

17. The gas extraction structure as claimed in claim 16, wherein a diameter of the gas vent is larger than that of the pin, and a diameter of the pin is substantially equal to that of the connecting aperture.

18. The gas extraction structure as claimed in claim 16, wherein the support structure includes a first support plate and a second support plate, the first support plate and the second support plate cooperatively support the pin.

19. The gas extraction structure as claimed in claim 16, wherein the support structure is configured to drive the pin from the first position to the second position when the mold cavity has been injected with molten material to about 95 percent of a capacity of the mold cavity.

20. The gas extraction structure as claimed in claim 16, wherein the support structure is further configured to drive the pin between the second position and a third position in which the pin has pushed a molded body away from a position corresponding to a position of the mold cavity.