Precision injection mold with multiple exhaust structure

Abstract

The utility model relates to mould technical field discloses the precise injection mold with multiple exhaust structure, including roof, the inner wall of roof is provided with feed inlet, the lower surface fixedly connected with movable mould of roof, the lower surface fixedly connected with core and guide rod of movable mould, the outer wall sliding connection has with fixed mould of guide rod, the inner wall fixedly connected with cavity of fixed mould, the cavity inner wall is provided with exhaust component, the exhaust component includes exhaust port no.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a precision injection mold with a multi-venting structure. Background Technology

[0002] In modern manufacturing, injection molding is a core process in plastic processing. The performance of the mold directly determines the quality of the final product. During the high-speed and high-pressure injection process, molten plastic rapidly fills the mold cavity, inevitably entraining air or generating thermal decomposition gases. If these gases cannot be discharged in time and completely before the melt solidifies, they will remain inside or on the surface of the product, forming fatal defects such as bubbles, silver streaks, scorching, and insufficient filling. These defects severely restrict product performance, reliability, and aesthetics. Precision injection molds with efficient and comprehensive venting capabilities have become a key technological direction for improving injection molding technology and product quality.

[0003] In the existing technology, the venting structure of traditional precision injection molds mostly adopts a single venting method, which commonly includes setting venting grooves on the mold parting surface. The gas is squeezed out from the gap by the pressure of the melt filling the mold. The technical principle is mainly to allow the gas in the cavity to be passively discharged under the action of melt flow pressure through the tiny gaps or channels formed by the mold structure itself.

[0004] However, the existing single venting structure is difficult to fully cover all areas of complex cavities, which can easily lead to defects such as pinholes on the surface of injection molded parts and voids inside, affecting the precision and appearance quality of the product. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a precision injection mold with multiple venting structures, which aims to improve the problem that the single venting structure of the existing technology cannot fully cover all areas of the complex cavity, which easily leads to defects such as pinholes on the surface of the injection molded parts and voids inside, affecting the precision and appearance quality of the product.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a precision injection mold with a multi-venting structure, including a top plate, an inlet provided on the inner wall of the top plate, a moving mold fixedly connected to the lower surface of the top plate, a core and a guide rod fixedly connected to the lower surface of the moving mold, a fixed mold slidably connected to the outer wall of the guide rod, a cavity fixedly connected to the inner wall of the fixed mold, and a venting assembly provided on the inner wall of the cavity;

[0007] The exhaust assembly includes an exhaust port one and an exhaust port two. The exhaust port one is disposed on one side of the inner wall of the cavity. A needle cover is slidably connected to the inner wall of the cavity. The inner wall of the exhaust port two is disposed on the inner wall of the needle cover.

[0008] Furthermore, a connecting plate is fixedly connected to the lower surface of the fixed mold, a base plate is fixedly connected to the lower surface of the connecting plate, and a support plate is slidably connected to the inner wall of the connecting plate.

[0009] Furthermore, an exhaust pipe is fixedly connected to one end of the exhaust port, the outer wall of the exhaust pipe is disposed on the inner wall of the fixed mold, a threaded pipe is provided at one end of the exhaust pipe, a connecting pipe is slidably connected to one end of the threaded pipe, and an exhaust chamber is fixedly connected to one end of the connecting pipe.

[0010] Furthermore, a pin is provided on the inner wall of the needle cover, and the pin is fixedly connected to the upper surface of the support plate.

[0011] Furthermore, a connecting pipe two is fixedly connected to one side of the ejector pin, an exhaust pipe two is fixedly connected to one side of the outer wall of the ejector pin, a connecting pipe three is fixedly connected to one side of the outer wall of the exhaust pipe two, one end of the connecting pipe three is fixedly connected to the lower surface of the exhaust chamber, and a vacuum pump is fixedly connected to one side of the outer wall of the exhaust chamber.

[0012] Furthermore, a slot is provided on the outer wall of the needle cover, and a locking rod is fixedly connected to the outer wall of the ejector pin, with the locking rod slidably connected to the inner wall of the slot.

[0013] Furthermore, a spring is fixedly connected to one side of the inner wall of the needle cover, and a limit block is fixedly connected to one end of the spring. The outer wall of the limit block is slidably connected to one side of the inner wall of the slot.

[0014] Furthermore, the outer wall of the threaded tube is threadedly connected to the inner wall of the fixed mold, and an installation block is fixedly connected to the outer wall of the threaded tube. A sealing ring is fixedly connected to one side of the outer wall of the installation block.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the gas inside the mold cavity enters the exhaust chamber through the first exhaust port and simultaneously enters the needle cover and ejector pin through the second exhaust port, which are also delivered to the exhaust chamber. The vacuum pump is started, and the gas gathered in the exhaust chamber is extracted by negative pressure. The dual paths cover different positions in the mold cavity. With the vacuum pump for centralized gas extraction, the air and thermal decomposition gases trapped in the melt flow are efficiently discharged, which significantly reduces defects such as pinholes and internal voids on the surface of the injection molded parts, greatly improves the product precision and appearance quality, and thus improves the practicality of the device.

[0017] 2. In this utility model, by rotating the threaded tube with the mounting block, the first exhaust pipe can be pulled out, thereby directly cleaning the first exhaust port and the molten residue inside the first exhaust pipe. By pressing the limit block to compress the spring, the clamping rod can be disengaged from the clamping groove, thus quickly separating the needle cover and the ejector pin, thereby cleaning the residual molten material on the second exhaust port and the needle cover, thereby improving the ease of maintenance of the exhaust channel, improving the overall efficiency of the equipment, and thus improving the practicality of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the precision injection mold with multiple venting structures proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the fixed mold part of the precision injection mold with multiple venting structures proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the cavity structure of a precision injection mold with a multi-venting structure proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the two-part exhaust port structure of the precision injection mold with multiple exhaust structures proposed in this utility model.

[0022] Figure 5 for Figure 4 Enlarged diagram of point A in the diagram.

[0023] Legend:

[0024] 1. Top plate; 2. Moving mold; 3. Core; 4. Guide rod; 5. Fixed mold; 6. Cavity; 7. Connecting plate; 8. Base plate; 9. Support plate; 10. Vent 1; 11. Vent 1; 12. Threaded pipe; 13. Connecting pipe 1; 14. Vent chamber; 15. Vent 2; 16. Pin cover; 17. Ejector pin; 18. Connecting pipe 2; 19. Vent 2; 20. Connecting pipe 3; 21. Vacuum pump; 22. Locking rod; 23. Locking groove; 24. Spring; 25. Limiting block; 26. Mounting block; 27. Sealing ring; 28. Feed port. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1-5This utility model provides an embodiment of a precision injection mold with a multi-venting structure, including a top plate 1. The inner wall of the top plate 1 has a feed inlet 28 for injecting molten plastic into a cavity 6. A moving mold 2 is fixedly connected to the lower surface of the top plate 1. A core 3 and a guide rod 4 are fixedly connected to the lower surface of the moving mold 2. The guide rod 4 is used to precisely guide the opening and closing movements of the moving mold 2 and the fixed mold 5, achieving the effect of avoiding mold misalignment and protecting the precision of the cavity 6. The outer wall of the guide rod 4 is slidably connected to the fixed mold 5. The inner wall of the fixed mold 5 is fixedly connected to the cavity 6. The core 3, together with the cavity 6, forms a closed and high-precision injection space, ensuring the shape accuracy of the injection molded part. A venting assembly is provided on the inner wall of the cavity 6, including a vent 10 and a vent 15. Vent 10 is used to discharge gas at the melt flow front, reducing air bubble residue in the corners of cavity 6. Vent 2 15 is used to collect gas in the cavity 6 near the ejector pin 17 area, forming a complementary venting path with Vent 10, covering the dead corners of cavity 6 where venting is difficult, reducing internal void defects. Vent 10 is located on one side of the inner wall of cavity 6. A pin cover 16 is slidably connected to the inner wall of cavity 6. The inner wall of Vent 2 15 is located on the inner wall of pin cover 16. A connecting plate 7 is fixedly connected to the lower surface of fixed mold 5. A base plate 8 is fixedly connected to the lower surface of connecting plate 7. A support plate 9 is slidably connected to the inner wall of connecting plate 7. Vent 10 is fixedly connected to one end of vent 11. The outer wall of vent 11 is located on the inner wall of fixed mold 5. One end of vent 11 is threaded. Pipe 12, threaded pipe 12, has a connecting pipe 13 slidably connected to one end. A venting chamber 14 is fixedly connected to one end of the connecting pipe 13. The venting chamber 14 collects the gas transmitted by the venting pipe 11 and the connecting pipe 20, providing a concentrated space for the vacuum pump 21 to ensure rapid gas discharge. A ejector pin 17 is provided on the inner wall of the needle cover 16. The ejector pin 17 is used to eject the molded part after injection molding to achieve demolding. Simultaneously, its internal connecting pipe 2 18 and venting pipe 2 19 can guide the gas collected at the venting port 2 15 into the venting chamber 14, serving both demolding and auxiliary venting functions. The ejector pin 17 is fixedly connected to the upper surface of the support plate 9. A connecting pipe 2 18 is fixedly connected to one side of the ejector pin 17, and a venting pipe 2 19 is fixedly connected to one side of the outer wall of the ejector pin 17. A connecting pipe 20 is fixedly connected to one side of the outer wall of the 9th tube. One end of the connecting pipe 20 is fixedly connected to the lower surface of the exhaust chamber 14. A vacuum pump 21 is fixedly connected to one side of the outer wall of the exhaust chamber 14. The vacuum pump 21 extracts the gas gathered in the exhaust chamber 14 through negative pressure, providing power for the entire exhaust system and improving the exhaust speed and thoroughness. Compared with natural exhaust, it can significantly reduce product defects. A slot 23 is opened on the outer wall of the needle cover 16. A locking rod 22 is fixedly connected to the outer wall of the ejector pin 17. The locking rod 22 is slidably connected to the inner wall of the slot 23. A spring 24 is fixedly connected to one side of the inner wall of the needle cover 16. The spring 24 is used to push the limiting block 25 to lock the locking rod 22 in the slot 23, thereby locking the needle cover 16 and the ejector pin 17. One end of the spring 24 is fixedly connected to the limiting block 25.The outer wall of the limiting block 25 is slidably connected to one side of the inner wall of the slot 23. The outer wall of the threaded tube 12 is threadedly connected to the inner wall of the fixed mold 5. An installation block 26 is fixedly connected to the outer wall of the threaded tube 12. The threaded tube 12 is used to achieve detachable installation of the exhaust pipe 11. The exhaust pipe 11 can be pulled out for cleaning by rotating the installation block 26. Compared with a fixed exhaust structure, this is easier to maintain. A sealing ring 27 is fixedly connected to one side of the outer wall of the installation block 26. The sealing ring 27 is used to seal the connection gap between the installation block 26 and the fixed mold 5, preventing gas leakage from the exhaust pipe 11 and ensuring that all gas is introduced into the exhaust chamber 14, thus improving the sealing performance and efficiency of the exhaust system.

[0027] Working principle: When using the injection mold, the core 3 is first embedded into the cavity 6 to form a closed and high-precision injection space. Then, molten plastic is injected into the cavity 6 through the inlet 28. At this time, the gas is efficiently discharged through the venting assembly. The gas in the cavity 6 enters the venting pipe 11 embedded in the fixed mold 5 through the venting port 10 on the side wall of the cavity 6, and is introduced into the venting chamber 14 through the threaded pipe 12 and the connecting pipe 13. At the same time, the gas in the cavity 6 enters the pin cover 16 and the ejector pin 17 through the second venting port 15, and then enters the ejector pin 17 through the connecting pipe 12 on the ejector pin 17. 8 and exhaust pipe 2 19 are also delivered to exhaust chamber 14 through connecting pipe 3 20. Vacuum pump 21 connected to exhaust chamber 14 is started, and the gas gathered in exhaust chamber 14 is extracted by negative pressure, so as to realize the comprehensive and efficient discharge of gas in cavity 6, avoid the impact of residual air bubbles on the quality of injection molded parts. The dual path covers different positions of cavity 6. With the vacuum pump 21 for centralized gas extraction, the air and thermal decomposition gas trapped in the melt flow can be efficiently discharged, significantly reducing defects such as pinholes on the surface and internal voids of injection molded parts, and greatly improving product precision and appearance quality.

[0028] Secondly, after long-term injection molding, the vent and vent pipe are prone to blockage due to residual melt residue. By rotating the threaded pipe 12 with the mounting block 26, the vent pipe 11 can be pulled out, thereby directly cleaning the residual melt residue in the vent 10 and vent pipe 11. After cleaning, the vent pipe 11 is pushed back in and screwed back into the threaded pipe 12 to complete the reset. Then, by pressing the limit block 25 to compress the spring 24, the locking rod 22 is disengaged from the slot 23, which can quickly separate the needle cover 16 and the ejector pin 17, thereby cleaning the residual melt on the vent 15 and the needle cover 16. After cleaning, it is re-locked into the slot 23, and the spring 24 rebounds to push the limit block 25 to lock, thereby improving the ease of maintenance of the vent channel and improving the overall efficiency of the equipment.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precision injection mold with a multi-venting structure, including a top plate (1), characterized in that: The inner wall of the top plate (1) is provided with a feed port (28), the lower surface of the top plate (1) is fixedly connected with a moving mold (2), the lower surface of the moving mold (2) is fixedly connected with a core (3) and a guide rod (4), the outer wall of the guide rod (4) is slidably connected with a fixed mold (5), the inner wall of the fixed mold (5) is fixedly connected with a cavity (6), and the inner wall of the cavity (6) is provided with an exhaust assembly; The exhaust assembly includes an exhaust port one (10) and an exhaust port two (15). The exhaust port one (10) is located on one side of the inner wall of the cavity (6). The inner wall of the cavity (6) is slidably connected to a needle cover (16). The inner wall of the exhaust port two (15) is located on the inner wall of the needle cover (16).

2. The precision injection mold with multiple venting structures according to claim 1, characterized in that: A connecting plate (7) is fixedly connected to the lower surface of the fixed mold (5), a base plate (8) is fixedly connected to the lower surface of the connecting plate (7), and a support plate (9) is slidably connected to the inner wall of the connecting plate (7).

3. The precision injection mold with multiple venting structures according to claim 1, characterized in that: One end of the exhaust port (10) is fixedly connected to an exhaust pipe (11), the outer wall of the exhaust pipe (11) is set on the inner wall of the fixed mold (5), one end of the exhaust pipe (11) is provided with a threaded pipe (12), one end of the threaded pipe (12) is slidably connected to a connecting pipe (13), and one end of the connecting pipe (13) is fixedly connected to an exhaust chamber (14).

4. The precision injection mold with multiple venting structures according to claim 1, characterized in that: The inner wall of the needle cover (16) is provided with a push pin (17), which is fixedly connected to the upper surface of the support plate (9).

5. The precision injection mold with a multi-venting structure according to claim 4, characterized in that: A connecting pipe two (18) is fixedly connected to one side of the ejector pin (17), an exhaust pipe two (19) is fixedly connected to one side of the outer wall of the ejector pin (17), a connecting pipe three (20) is fixedly connected to one side of the outer wall of the exhaust pipe two (19), one end of the connecting pipe three (20) is fixedly connected to the lower surface of the exhaust chamber (14), and a vacuum pump (21) is fixedly connected to one side of the outer wall of the exhaust chamber (14).

6. The precision injection mold with a multi-venting structure according to claim 4, characterized in that: The outer wall of the needle cover (16) is provided with a slot (23), and the outer wall of the ejector pin (17) is fixedly connected with a locking rod (22), which is slidably connected to the inner wall of the slot (23).

7. The precision injection mold with a multi-venting structure according to claim 1, characterized in that: A spring (24) is fixedly connected to one side of the inner wall of the needle cap (16), and a limit block (25) is fixedly connected to one end of the spring (24). The outer wall of the limit block (25) is slidably connected to one side of the inner wall of the slot (23).

8. The precision injection mold with a multi-venting structure according to claim 3, characterized in that: The outer wall of the threaded tube (12) is threaded to the inner wall of the fixed mold (5), and an installation block (26) is fixedly connected to the outer wall of the threaded tube (12). A sealing ring (27) is fixedly connected to one side of the outer wall of the installation block (26).

Images