Automatic cutting mechanism for latent glue port of injection mold

Abstract

The utility model discloses a kind of automatic cutting mechanism of injection mold latent glue port, including upper plate and lower plate, upper plate is set down fixed plate, glue port sleeve is set in upper plate and fixed plate, perforation is opened in lower plate, die foot is set on lower plate, and the lower plate between die foot is set with ejection assembly, the ejector rod of injection machine passes through perforation and is matched with ejection assembly, movable plate is set on die foot, and movable plate and fixed plate form mould cavity between, and there is plastic part in mould cavity, glue groove and latent glue port are opened in the movable plate, and there is glue material in glue groove and latent glue port, glue port sleeve is communicated with glue groove, glue groove is communicated with latent glue port, product top hole, waste material top hole and latent glue inlet are opened in movable plate, product top hole upper portion is communicated with latent glue inlet lower portion, latent glue inlet upper portion is communicated with mould cavity, latent glue inlet side wall is communicated with latent glue port, waste material top hole upper portion is communicated with glue groove, and ejection assembly is matched with plastic part and glue material.

Description

Technical Field

[0001] This utility model relates to injection molds, and in particular to an automatic cutting mechanism for a submerged gate in injection molds. Background Technology

[0002] When producing plastic parts using injection molds, plastic granules are typically heated into a molten compound through a barrel. This molten compound is then injected into the mold cavity through a nozzle. After cooling, the compound forms the plastic part. Finally, the mold opens, and the ejector mechanism ejects the molded part. In existing injection molds, the nozzle is usually located on top of the plastic part (i.e., the front side). Because the compound in the nozzle is integrally connected to the part during injection, after molding, the compound in the nozzle (also called the sprue, or waste material) is ejected along with the part. This waste material is manually removed, which is cumbersome, reduces production efficiency, and increases labor intensity and costs. Furthermore, for manufacturers with high requirements for the gloss and aesthetics of the plastic part's surface, even after removal, nozzle marks remain, resulting in substandard surface appearance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a hidden automatic gate cutting mechanism for injection molds that ensures the aesthetic appearance of plastic parts, eliminates gate marks, improves production efficiency, reduces labor intensity, and lowers labor costs.

[0004] The technical solution of this utility model for an automatic gate cutting mechanism for injection molds is as follows: It includes an upper plate and a lower plate. A fixed template is set under the upper plate. A gate sleeve is set in the upper plate and the fixed template. A through hole is opened in the lower plate. Mold feet are set on the lower plate. An ejector assembly is set on the lower plate between the mold feet. The ejector rod of the injection molding machine passes through the through hole and cooperates with the ejector assembly. A movable template is set on the mold feet. A mold cavity is formed between the movable template and the fixed template. The mold cavity contains an injection-molded plastic part. The moving template has a material groove and a submerged injection port, through which the material enters. The injection port sleeve communicates with the material groove, and the material groove communicates with the submerged injection port. The moving template has a product top hole, a waste top hole, and a submerged injection hole. The upper part of the product top hole communicates with the lower part of the submerged injection hole, the upper part of the submerged injection hole communicates with the mold cavity, the side wall of the submerged injection hole communicates with the submerged injection port, and the upper part of the waste top hole communicates with the material groove. The ejection assembly cooperates with the plastic part and the material entering the mold.

[0005] Furthermore, the ejection assembly includes an upper ejector plate and a lower ejector plate. Product ejector pins and waste ejector pins are provided on the upper and lower ejector plates. The upper part of the product ejector pin passes through the product top hole and cooperates with the plastic part. The lower part of the waste ejector pin is located between the upper and lower ejector plates and is provided with a delayed ejection structure. The upper part of the waste ejector pin passes through the waste top hole and cooperates with the inlet material.

[0006] Furthermore, the delayed ejection structure includes corresponding grooves between the upper ejector plate and the lower ejector plate, a bottom groove at the bottom of the groove, an elastic element made of soft rubber material in the bottom groove, a convex ring at the lower end of the waste ejector pin, the convex ring cooperating with the groove, and the bottom of the convex ring cooperating with the elastic element.

[0007] Furthermore, the elastic element is an elastic pad or spring made of soft rubber material.

[0008] Furthermore, the submerged glue inlet is horn-shaped, and the inner diameter of the submerged glue inlet on the side of the glue trough is larger than the inner diameter of the submerged glue inlet on the side of the submerged glue inlet hole.

[0009] The beneficial effects of this utility model of a submerged automatic gate cutting mechanism for injection molds are: 1. By using a concealed glue nozzle to inject glue from the back of the plastic part, no glue nozzle marks are left on the front of the plastic part, ensuring the aesthetic appearance of the front of the plastic part. Second, by utilizing a delayed ejection structure, the waste ejector pin is ejected at a delayed rate relative to the product ejector pin, which allows the plastic part to be automatically cut off from the incoming material. This eliminates the need for manual waste removal later, improving production efficiency, reducing labor intensity, and lowering labor costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the mold closing state structure of a submerged automatic gate cutting mechanism for injection molds according to this utility model; Figure 2 This is a schematic diagram of the mold opening state structure of a submerged automatic gate cutting mechanism for injection molds according to this utility model. Figure 3 This is a schematic diagram of the structure of the product ejector pin pushing out the plastic part and cutting off the incoming plastic material. Figure 4 This is a schematic diagram of the structure of the plastic part and the ejection state of the inlet rubber material.

[0011] In the diagram, 1. Upper cover plate; 2. Lower cover plate; 3. Fixed template; 4. Glue gate sleeve; 5. Through hole; 6. Mold foot; 7. Ejector pin; 8. Moving template; 9. Plastic part; 10. Glue inlet; 11. Glue groove; 12. Submerged glue gate; 13. Product ejector hole; 14. Waste ejector hole; 15. Submerged glue inlet hole; 16. Upper ejector plate; 17. Lower ejector plate; 18. Product ejector pin; 19. Waste ejector pin; 20. Slide groove; 21. Bottom groove; 22. Elastic pad; 23. Raised ring. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0013] This utility model relates to an automatic cutting mechanism for a submerged gate in injection molds, such as... Figure 1 — Figure 4 As shown, the system includes an upper platen 1 and a lower platen 2. A fixed template 3 is provided under the upper platen 1. A sprue sleeve 4 is provided between the upper platen 1 and the fixed template 3. A through hole 5 is provided in the lower platen 2. A mold foot 6 is provided on the lower platen 2. An ejector assembly is provided on the lower platen 2 between the mold feet 6. The ejector rod 7 of the injection molding machine passes through the through hole 5 and cooperates with the ejector assembly. A movable template 8 is provided on the mold foot 6. A mold cavity is formed between the movable template 8 and the fixed template 3. A plastic part 9 is injection molded in the mold cavity. A sprue groove 11 and a submerged sprue 12 are provided on the movable template 8. The groove 11 and the hidden sprue 12 contain the injection material 10. The sprue sleeve 4 is connected to the material groove 11, and the material groove 11 is connected to the hidden sprue 12. The moving template 8 has a product top hole 13, a waste top hole 14, and a hidden injection hole 15. The upper part of the product top hole 13 is connected to the lower part of the hidden injection hole 15. The upper part of the hidden injection hole 15 is connected to the mold cavity. The side wall of the hidden injection hole 15 is connected to the hidden sprue 12. The upper part of the waste top hole 14 is connected to the material groove 11. The ejection assembly cooperates with the plastic part 9 and the injection material 10.

[0014] Furthermore, the ejection assembly includes an upper ejector plate 16 and a lower ejector plate 17. Product ejector pins 18 and waste ejector pins 19 are provided on the upper ejector plate 16 and the lower ejector plate 17. The upper part of the product ejector pin 18 passes through the product ejector hole 13 and cooperates with the plastic part 9. The lower part of the waste ejector pin 19 is located between the upper ejector plate 16 and the lower ejector plate 17 and is provided with a delayed ejection structure. The upper part of the waste ejector pin 19 passes through the waste ejector hole 14 and cooperates with the inlet material 10.

[0015] Furthermore, the delayed ejection structure includes corresponding grooves 20 between the upper ejector plate 16 and the lower ejector plate 17, a bottom groove 21 at the bottom of the groove 20, an elastic element made of soft rubber material in the bottom groove 21, and a protruding ring 23 at the lower end of the waste ejector pin 19. The protruding ring 23 cooperates with the groove 20, and the bottom of the protruding ring 23 cooperates with the elastic element.

[0016] Furthermore, the elastic element is an elastic pad 22 or a spring made of soft rubber material.

[0017] Furthermore, the submerged injection port 12 is horn-shaped, and the inner diameter of the submerged injection port 12 on the side of the material groove 11 is larger than the inner diameter of the submerged injection port 12 on the side of the submerged injection hole 15. The horn-shaped submerged injection port 12 has a large inlet inner diameter, which is conducive to material feeding, and the outlet inner diameter gradually decreases, which reduces the size of the connection between the plastic part 9 and the injected material 10, thereby facilitating automatic cutting at the connection. At the same time, after the connection between the injected material 10 and the plastic part 9 at the submerged injection port 12 is cut off, the elastic deformation ability of the plastic material itself, combined with the horn-shaped structure, is more conducive to the ejection and demolding of the injected material 10 at that point.

[0018] This utility model discloses an automatic cutting mechanism for a submerged injection gate in an injection mold. During injection molding, hot-melt rubber is injected into the rubber trough 11 through the injection gate sleeve 4, and then enters the submerged injection gate 12 through the rubber trough 11. At this time, the mold is in the closed state, and the product ejector pin 18 is in the downward reset state. The rubber can flow downward along the submerged injection gate 12 into the submerged injection hole 15 (the product ejector pin 18 blocks the submerged injection hole 15, preventing the rubber from flowing downward). Then, it flows upward through the submerged injection hole 15 into the mold cavity until the mold cavity is full of rubber, at which point the injection stops. As the rubber gradually cools, the rubber in the mold cavity and the submerged injection hole 15 forms a solid mass. Plastic part 9 is formed. The plastic material in the sprue sleeve 4, the plastic material groove 11, and the recessed sprue 12 forms the injection material 10 (the injection material is waste material). At this time, the injection material 10 is integrally connected with the plastic part 9. Then, the injection molding machine drives the lower platen 2 to move downward. The lower platen 2 drives the mold feet 6, the ejector assembly, the moving platen 8, the plastic part 9, and the injection material 10 to move downward together, while the upper platen 1, the fixed platen 3, and the sprue sleeve 4 remain stationary. The mold opens from the fixed platen 3 and the moving platen 8. When the lower ejector plate 17 of the ejector assembly moves to the position of the ejector rod 7 of the injection molding machine, the ejector rod 7 stops the lower ejector plate 17 and the upper ejector plate 16 from moving. The ejector plates 16 and 17 stop the product ejector pin 18 from moving, and the product ejector pin 18 stops moving while pressing against the plastic part 9. Meanwhile, the lower cover plate 2 drives the mold foot 6 and the moving platen 8 to continue moving downward, so that the product ejector pin 18 pushes against the plastic part 9 and disengages from the moving platen 8. Because the upper and lower ejector plates 16 and 17 at the lower end of the scrap ejector pin 19 have grooves 20 and elastic elements are provided at the lower end of the scrap ejector pin 19, when the upper and lower ejector plates 16 and 17 stop moving, the moving platen 8 will drive the injection material 10 to continue moving downward a short distance (the moving platen 8 has a large clamping force on the injection material 10, so it will continue to drive the injection material). 10 moves), the incoming material 10 drives the scrap ejector pin 19 to overcome the elastic force of the elastic element and move downward along the slide 20. Since the plastic part 9 stops moving, the connection between the plastic part 9 and the incoming material 10 is automatically cut off. When the convex ring 23 of the scrap ejector pin 19 moves downward to the bottom of the slide 20, the scrap ejector pin 19 stops moving and squeezes the elastic element, while the lower cover plate 2, mold foot 6, and moving mold plate 8 continue to move downward. The scrap ejector pin 19 pushes the incoming material 10 out of the mold and demolds it. At this time, the elastic element will push the scrap ejector pin 19 upward under the action of elastic restoring force, so that the convex ring 23 of the scrap ejector pin 19 moves upward to the top of the slide 20.

[0019] Although the embodiments of this application disclose the above-described methods, the content is merely an implementation method adopted for ease of understanding. Any person skilled in the art should understand that any modifications and changes in the form and details of the implementation can be made without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. An automatic gate cutting mechanism for injection molds, comprising an upper platen (1) and a lower platen (2), wherein a fixed template (3) is provided under the upper platen (1), and a gate sleeve (4) is provided between the upper platen (1) and the fixed template (3), a through hole (5) is provided in the lower platen (2), a mold foot (6) is provided on the lower platen (2), an ejector assembly is provided on the lower platen (2) between the mold feet (6), an ejector rod (7) of an injection molding machine passes through the through hole (5) and cooperates with the ejector assembly, a movable template (8) is provided on the mold foot (6), and a mold cavity is formed between the movable template (8) and the fixed template (3), wherein a plastic part (9) is injection molded in the mold cavity, characterized in that: The moving template (8) has a material groove (11) and a hidden glue inlet (12). The material groove (11) and the hidden glue inlet (12) contain glue material (10). The glue inlet sleeve (4) is connected to the material groove (11). The material groove (11) is connected to the hidden glue inlet (12). The moving template (8) has a product top hole (13), a waste top hole (14) and a hidden glue inlet hole (15). The upper part of the product top hole (13) is connected to the lower part of the hidden glue inlet hole (15). The upper part of the hidden glue inlet hole (15) is connected to the mold cavity. The side wall of the hidden glue inlet hole (15) is connected to the hidden glue inlet (12). The upper part of the waste top hole (14) is connected to the material groove (11). The ejection assembly is in conjunction with the plastic part (9) and the glue inlet (10).

2. The automatic gate cutting mechanism for injection molds as described in claim 1, characterized in that: The ejection assembly includes an upper ejector plate (16) and a lower ejector plate (17). Product ejector pins (18) and waste ejector pins (19) are provided on the upper ejector plate (16) and the lower ejector plate (17). The upper part of the product ejector pin (18) passes through the product top hole (13) and cooperates with the plastic part (9). The lower part of the waste ejector pin (19) is located between the upper ejector plate (16) and the lower ejector plate (17) and is provided with a delayed ejection structure. The upper part of the waste ejector pin (19) passes through the waste top hole (14) and cooperates with the inlet material (10).

3. The automatic gate cutting mechanism for injection molds as described in claim 2, characterized in that: The delayed ejection structure includes corresponding grooves (20) between the upper ejector plate (16) and the lower ejector plate (17), a bottom groove (21) is provided at the bottom of the groove (20), an elastic element is provided in the bottom groove (21), a convex ring (23) is provided at the lower end of the waste ejector (19), the convex ring (23) cooperates with the groove (20), and the bottom of the convex ring (23) cooperates with the elastic element.

4. The automatic gate cutting mechanism for injection molds as described in claim 3, characterized in that: The elastic element is an elastic pad (22) or a spring made of soft rubber material.

5. The automatic gate cutting mechanism for injection molds as described in claim 2, characterized in that: The submerged glue inlet (12) is horn-shaped, and the inner diameter of the submerged glue inlet (12) on the side of the glue tank (11) is larger than the inner diameter of the submerged glue inlet (12) on the side of the submerged glue inlet (15).

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