Injection mold with submarine gate

Abstract

The utility model provides an injection mold with a submarine gate. The injection mold comprises an upper injection mold, a lower injection mold, an ejector pin assembly, a bottom plate, a forming cavity and a runner, wherein the submarine gate is arranged at the tail end of the runner; the ejector pin assembly comprises a first ejector plate, a second ejector plate, a runner ejector pin and a product ejector pin, the top end of the runner ejector pin abuts against the runner, the bottom end of the runner ejector pin is fixedly arranged on the first ejector plate and the second ejector plate, and the top end of the product ejector pin abuts against an injection product; the bottom end of the product ejector pin penetrates through through holes penetrating through the first ejector plate and the second ejector plate and abuts against the bottom plate, the through holes comprise the first through hole and the second through hole which are sequentially connected, the product ejector pin is provided with a protruding block structure, the protruding block structure is located in the first through hole, and a first distance is formed between the protruding block structure and the second through hole. And the first distance is greater than zero. The injection mold can avoid ejector pin marks on injection products and improve poor appearance.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an injection mold with a latent gate. Background Art

[0002] The application of latent gate in injection molds is very common. However, for thin-walled injection molded parts, the latent gate can easily cause pulling force on the product when the injection mold is opened and ejected, resulting in ejector marks on the product and poor appearance. Utility Model Content

[0003] In view of the above technical problems, the utility model provides an injection mold with a latent gate.

[0004] The utility model discloses an injection mold with a latent gate, the injection mold with the latent gate comprises: an injection upper mold, an injection lower mold located below the injection upper mold, an ejector assembly and a bottom plate, a molding chamber and a flow channel are formed between the injection upper mold and the injection lower mold, the injection molded product is molded in the molding chamber, and a latent gate is arranged at the end of the flow channel;

[0005] The ejector assembly is arranged between the lower injection mold and the bottom plate, and the ejector assembly includes a first ejector plate, a second ejector plate, a runner ejector and a product ejector, the first ejector plate and the second ejector plate are stacked up and down, and the second ejector plate is located between the first ejector plate and the bottom plate, the top end of the runner ejector abuts the runner, the bottom end of the runner ejector is fixedly arranged on the first ejector plate and the second ejector plate, the top end of the product ejector abuts the injection molded product, the bottom end of the product ejector passes through the through hole penetrating the first ejector plate and the second ejector plate and abuts against the bottom plate, the through hole includes a first through hole and a second through hole connected in sequence, wherein the cross-sectional size of the first through hole is greater than the cross-sectional size of the second through hole, and the second through hole is close to the bottom plate; and the product ejector has a convex block structure, the convex block structure is located in the first through hole, and there is a first distance between the convex block structure and the second through hole, and the first distance is greater than zero.

[0006] As an optional technical solution, the first distance is smaller than a second distance that the runner ejector pin needs to move to eject the runner condensate.

[0007] As an optional technical solution, the first distance is greater than or equal to a second distance that the runner ejector needle needs to move to eject the runner condensate.

[0008] As an optional technical solution, the end of the product ejector pin that contacts the injection molded product is a smooth arc surface.

[0009] As an optional technical solution, the feeding section of the latent gate is conical.

[0010] As an optional technical solution, the bottom plate is further provided with a socket, and the bottom end of the product ejector pin is movably inserted into the socket.

[0011] As an optional technical solution, the through hole further includes a third through hole, the first through hole is located between the third through hole and the second through hole, and a cross-sectional dimension of the first through hole is greater than a cross-sectional dimension of the third through hole.

[0012] As an optional technical solution, the first through hole is located on the first ejection plate.

[0013] As an optional technical solution, the first through hole is located on the first ejection plate and the second ejection plate.

[0014] As an optional technical solution, the first through hole is located on the second ejection plate.

[0015] Compared with the prior art, when the injection mold of the utility model is opened, the first ejector plate and the second ejector plate move upward, and the flow ejector pin will first push against the runner condensate. When the first ejector plate and the second ejector plate move to the connection between the convex block structure and the first through hole and the second through hole, the first ejector plate and the second ejector plate will drive the product ejector pin to move, and then push against the injection molded product to eject the injection molded product. During this process, there will be no contact between the injection molded product and the latent gate, thereby avoiding the pulling force of the latent gate on the injection molded product, thereby avoiding the appearance of ejector pin marks on the injection molded product, improving the poor appearance, ensuring product quality, improving production efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of an injection mold with a latent gate according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the enlarged area A in the middle. DETAILED DESCRIPTION

[0019] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of an injection mold with a latent gate according to an embodiment of the utility model; Figure 2 for Figure 1 The utility model provides an injection mold with a latent gate, the injection mold with the latent gate comprises: an injection mold 1, an injection mold 2 located below the injection mold 1, an ejector assembly and a bottom plate 3, a molding chamber and a runner 4 are formed between the injection mold 1 and the injection mold 2, the injection molded product 5 is molded in the molding chamber, and a latent gate 6 is arranged at the end of the runner 4.

[0022] The ejector assembly is arranged between the injection lower mold 2 and the bottom plate 3, and the ejector assembly includes a first ejector plate 7, a second ejector plate 8, a runner ejector pin 9 and a product ejector pin 10. The first ejector plate 7 and the second ejector plate 8 are stacked up and down, and the second ejector plate 8 is located between the first ejector plate 7 and the bottom plate 3. The top end of the runner ejector pin 9 abuts against the runner 4, and the bottom end of the runner ejector pin 9 is fixedly arranged on the first ejector plate 7 and the second ejector plate 8. The top end of the product ejector pin 10 abuts against the injection molded product 5, and the bottom end of the product ejector pin 10 passes through the through hole. The through holes 11 of the first ejector plate 7 and the second ejector plate 8 are against the bottom plate 3, and the through holes 11 include a first through hole 12 and a second through hole 13 connected in sequence, wherein the cross-sectional dimension of the first through hole 12 is greater than the cross-sectional dimension of the second through hole 13, and the second through hole 13 is close to the bottom plate 3; and the product ejector pin 10 has a bump structure 14, and the bump structure 14 is located in the first through hole 12, and when the injection mold is closed, there is a first distance between the bump structure 14 and the second through hole 13, and the first distance is not zero.

[0023] Preferably, the first distance is smaller than the second distance that the runner ejector pin 9 needs to move to eject the runner condensate. That is, after the injection mold is opened, when the first ejector plate 7 and the second ejector plate 8 move upward, the runner ejector pin 9 will be driven to move upward at the same time to act on the runner condensate so that the latent gate 6 is separated from the injection molded product 5. At this time, due to the existence of the first distance, the first ejector plate 7 and the second ejector plate 8 have not yet acted on the bump structure 14 of the product ejector pin 10. The first ejector plate 7 and the second ejector plate 8 continue to move upward. When the protrusion structure 14 on the product ejector pin 10 contacts the connection 16 between the first through hole 12 and the second through hole 13, the first ejector plate 7 and the second ejector plate 8 will also drive the product ejector pin 10 to move upward to act on the injection molded product 5. However, since the first distance is smaller than the second distance, the runner condensate has not been completely ejected at this time, but the latent gate 6 has been separated from the injection molded product 5. Therefore, the runner condensate and the injection molded product will still be ejected one after the other by the runner ejector pin 9 and the product ejector pin 10 respectively, and there will be no pulling force exerted by the latent gate 6 on the injection molded product 5.

[0024] In another embodiment, the first distance is greater than or equal to the second distance that the runner ejector pin 9 needs to move to eject the runner condensate. Then, after the injection mold is opened, the first ejector plate 7 and the second ejector plate 8 move upward, which will drive the runner ejector pin 9 to move upward to eject the runner condensate. The first ejector plate 7 and the second ejector plate 8 continue to move upward until the bump structure 14 contacts the connection 16 of the first through hole 12 and the second through hole 13. When the first ejector plate 7 and the second ejector plate 8 move upward, they will also drive the product ejector pin 10 to move upward to eject the injection molded product 5.

[0025] Furthermore, one end of the product ejector pin 10 that contacts the injection molded product 5 is a smooth arc surface.

[0026] Furthermore, the feeding section of the latent gate 6 is in a cone shape.

[0027] Furthermore, the bottom plate 3 is also provided with a socket, and the bottom end of the product ejector pin 10 is movably inserted into the socket. In this way, on the one hand, when the mold is closed, the socket can better limit the bottom end of the product ejector pin 10; on the other hand, after the mold is opened, when the first ejector plate 7 and the second ejector plate 8 move upward, driving the product ejector pin 10 to move upward, the bottom end of the product ejector pin 10 can be unimpededly separated from the socket and move upward to eject the injection molded product 5.

[0028] Furthermore, the through hole further includes a third through hole 15, the first through hole 12 is located between the third through hole 15 and the second through hole 13, and the cross-sectional dimension of the first through hole 12 is greater than the cross-sectional dimension of the third through hole 15. That is, the bump structure 14 on the product ejector pin 10 is confined in the first through hole 12 between the second through hole 13 and the third through hole 15.

[0029] In this embodiment, the first through hole 12 is located on the first ejection plate 7 and the second ejection plate 8. However, the present invention is not limited thereto. In another embodiment, the first through hole may be located on the first ejection plate. In another embodiment, the first through hole may also be located on the second ejection plate.

[0030] To sum up, when the mold is opened, the first ejector plate and the second ejector plate of the utility model move upward, and the flow ejector pin will first hit the runner condensate. When the first ejector plate and the second ejector plate move to the connection between the convex block structure and the first through hole and the second through hole, the first ejector plate and the second ejector plate will drive the product ejector pin to move, and then hit the injection molded product to eject the injection molded product. During this process, there will be no contact between the injection molded product and the latent gate, which avoids the pulling force of the latent gate on the injection molded product, thereby avoiding the ejector pin mark on the injection molded product, improving the poor appearance, ensuring product quality, improving production efficiency, and reducing production costs.

[0031] The present invention has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. In addition, the technical features involved in the different embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. An injection mold with a latent gate, characterized in that: The injection mold with a latent gate comprises: an injection upper mold, an injection lower mold located below the injection upper mold, an ejector assembly and a bottom plate, a molding cavity and a runner are formed between the injection upper mold and the injection lower mold, the injection molded product is molded in the molding cavity, and a latent gate is provided at the end of the runner; The ejector assembly is arranged between the lower injection mold and the bottom plate, and the ejector assembly includes a first ejector plate, a second ejector plate, a runner ejector and a product ejector, the first ejector plate and the second ejector plate are stacked up and down, and the second ejector plate is located between the first ejector plate and the bottom plate, the top end of the runner ejector abuts the runner, the bottom end of the runner ejector is fixedly arranged on the first ejector plate and the second ejector plate, the top end of the product ejector abuts the injection molded product, the bottom end of the product ejector passes through the through hole penetrating the first ejector plate and the second ejector plate and abuts against the bottom plate, the through hole includes a first through hole and a second through hole connected in sequence, wherein the cross-sectional size of the first through hole is greater than the cross-sectional size of the second through hole, and the second through hole is close to the bottom plate; and the product ejector has a convex block structure, the convex block structure is located in the first through hole, and there is a first distance between the convex block structure and the second through hole, and the first distance is greater than zero.

2. The injection mold with a latent gate according to claim 1, characterized in that: The first distance is smaller than a second distance that the runner ejector pin needs to move to eject the runner condensate.

3. The injection mold with latent gate according to claim 1, characterized in that: The first distance is greater than or equal to a second distance that the runner ejector pin needs to move to eject the runner condensate.

4. The injection mold with a latent gate according to claim 1, characterized in that: One end of the product ejector pin in contact with the injection molded product is a smooth arc surface.

5. The injection mold with latent gate according to claim 1, characterized in that: The feeding section of the latent gate is in a cone shape.

6. The injection mold with latent gate according to claim 1, characterized in that: The bottom plate is also provided with an insertion hole, and the bottom end of the product ejector pin is movably inserted into the insertion hole.

7. The injection mold with latent gate according to claim 1, characterized in that: The through hole further includes a third through hole, the first through hole is located between the third through hole and the second through hole, and a cross-sectional dimension of the first through hole is greater than a cross-sectional dimension of the third through hole.

8. The injection mold with latent gate according to claim 7, characterized in that: The first through hole is located on the first ejection plate.

9. The injection mold with latent gate according to claim 7, characterized in that: The first through hole is located on the first ejection plate and the second ejection plate.

10. The injection mold with latent gate according to claim 7, characterized in that: The first through hole is located on the second ejection plate.

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