Injection mold with automatic venting

Abstract

The utility model relates to injection mold technical field discloses a kind of injection mold with automatic exhaust device, including bottom plate, the outside fixed connection of bottom plate has lower mould holder, the outside fixed connection of lower mould holder has multiple guide pillars, the outside fixed connection of guide pillar has upper mould holder, the bottom fixed connection of upper mould holder has mould core, the outside fixed connection of mould core has multiple positioning rods, the outside fixed connection of bottom plate has exhaust mechanism, the inside fixed connection of lower mould holder has driving mechanism;The exhaust mechanism includes mould cavity, the outside fixed connection of mould cavity is in the outside of lower mould holder. In the utility model, positioning rod is moved by mould core, so that servo plate drives tension spring to move, then vacuum pump drives suction pipe to move, so that injection mold realizes automatic exhaust, can accurately discharge cavity gas, and enhances production stability and intelligent level.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold with an automatic venting device. Background Technology

[0002] In everyday consumer goods, it can be used to produce tableware, appliance casings, bathroom products, etc., to meet the needs of families and individuals. In the automotive industry, it is used to manufacture complex structural parts such as bumpers, dashboards, and door interiors to ensure the lightweighting and safety of automobiles. In industries such as toys, aerospace, and packaging, injection molds have also become a key technological support for large-scale production due to their advantages of high efficiency and low cost.

[0003] In existing technologies, some injection molds are widely used in manufacturing and engineering analysis techniques to achieve rapid and accurate design and virtual simulation. Based on big data and intelligent algorithms, design parameters can be intelligently optimized. In terms of material selection, new mold materials are constantly emerging. At the same time, surface treatment technologies such as nitriding and hard chrome plating have improved the wear resistance, corrosion resistance and demolding performance of the molds.

[0004] However, in actual use, the injection mold cannot automatically vent air. The air in the cavity will be squeezed by the molten plastic and trapped inside the cavity, resulting in defects such as bubbles, shrinkage cavities, surface defects, and weld lines in the product. At the same time, the high pressure generated by the air volume pressure can easily damage the mold and increase the load on the equipment. In order to address the above problems, an injection mold with an automatic venting device is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an injection mold with an automatic venting device, aiming to improve the problem that some injection molds in the prior art cannot achieve automatic venting.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An injection mold with an automatic venting device includes a base plate, a lower mold base fixedly connected to the outside of the base plate, a plurality of guide pillars fixedly connected to the outside of the lower mold base, an upper mold base fixedly connected to the outside of the guide pillars, a mold core fixedly connected to the bottom of the upper mold base, a plurality of positioning rods fixedly connected to the outside of the mold core, an venting mechanism fixedly connected to the outside of the base plate, and a driving mechanism fixedly connected to the inside of the lower mold base.

[0008] The venting mechanism includes a mold cavity, which is fixedly connected to the outside of the lower mold base. Multiple venting holes are provided on the outside of the mold cavity. A follower plate is fixedly connected to the outside of the venting holes. A tension spring is fixedly connected to the outside of the follower plate. A vacuum pump is fixedly connected to the outside of the base plate. A connecting pipe is fixedly connected to the output end of the vacuum pump. Multiple suction pipes are fixedly connected to the outside of the connecting pipe. A support assembly is fixedly connected to the inside of the upper mold base.

[0009] As a further description of the above technical solution:

[0010] The support assembly includes support rods, and multiple support rods are fixedly connected inside the upper mold base. A return spring is sleeved on the outside of the support rods.

[0011] As a further description of the above technical solution:

[0012] The driving mechanism includes a hydraulic cylinder, which is externally fixedly connected to the inside of the lower mold base, and a connecting rod is fixedly connected to the driving end of the hydraulic cylinder.

[0013] As a further description of the above technical solution:

[0014] The lower mold base has a guide groove inside, and a follower block is slidably connected inside the guide groove. The follower block is fixedly connected to the outside of the connecting rod.

[0015] As a further description of the above technical solution:

[0016] The follower block is internally fixedly connected to a connecting rod, and the connecting rod is externally fixedly connected to multiple pulleys;

[0017] As a further description of the above technical solution:

[0018] The follower block is externally fixedly connected to multiple connecting plates, and the connecting plates are externally fixedly connected to fixed blocks;

[0019] As a further description of the above technical solution:

[0020] The fixed block is externally fixedly connected to a support plate, and the support plate is externally fixedly connected to a push plate.

[0021] As a further description of the above technical solution:

[0022] One end of the tension spring is fixedly connected to the outside of the follower plate, and the other end of the tension spring is fixedly connected to the inside of the lower mold base.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, the positioning rod is driven by the mold core to move, which in turn drives the follower plate to move, which in turn drives the tension spring to move, which in turn drives the vacuum pump to move the air extraction pipe. This enables the injection mold to automatically exhaust gas, accurately discharge the cavity gas, reduce defects such as bubbles and material shortages, improve product yield and precision, shorten the molding cycle, cope with complex structures and high viscosity materials, and enhance production stability and intelligence.

[0025] 2. In this utility model, the hydraulic cylinder drives the connecting rod to move, which in turn drives the follower block to move the pulley, which in turn drives the connecting plate to move the fixed block, which in turn drives the support plate to move the push plate, thereby enabling the injection mold to automatically eject. By controlling and precisely matching the ejection timing and stroke, it can avoid product tearing or breakage, improve demolding quality, realize full-process automation, significantly shorten the production cycle, and reduce mold wear. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of an injection mold with an automatic venting device according to the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of a return spring for an injection mold with an automatic venting device proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of a vacuum pump for an injection mold with an automatic exhaust device, as proposed in this utility model.

[0029] Figure 4 This is a schematic diagram of the push plate of an injection mold with an automatic venting device proposed in this utility model;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0031] Legend:

[0032] 1. Base plate; 2. Lower mold base; 3. Guide pillar; 4. Upper mold base; 5. Mold core; 6. Positioning rod; 7. Mold cavity; 8. Vent hole; 9. Follower plate; 10. Tension spring; 11. Vacuum pump; 12. Connecting pipe; 13. Evacuation pipe; 14. Support rod; 15. Return spring; 16. Hydraulic cylinder; 17. Connecting rod; 18. Guide groove; 19. Follower block; 20. Connecting rod; 21. Pulley; 22. Connecting plate; 23. Fixing block; 24. Support plate; 25. Push plate. Detailed Implementation

[0033] 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.

[0034] Reference Figures 1 to 3 This utility model provides an embodiment of an injection mold with an automatic venting device, comprising a base plate 1, the surface of which is treated with an anti-slip coating and is securely placed on the injection molding machine worktable. A lower mold base 2 is fixedly connected to the outside of the base plate 1. The surface of the lower mold base 2 is provided with regular heat dissipation grooves to facilitate rapid heat dissipation of the mold during long-term operation. Multiple guide pillars 3 are fixedly connected to the outside of the lower mold base 2. The surface of the guide pillars 3 is precision polished to a mirror smooth finish. They are evenly distributed along the vertical direction to provide precise guidance for the opening and closing of the mold. An upper mold base 4 is fixedly connected to the outside of the guide pillars 3. The upper mold base 4 is a flat rectangular structure. A mold core 5 is fixedly connected to the center of its bottom. The mold core 5 is designed according to the shape of the injection molded product and its surface is covered with complex curved shapes. The bottom of the upper mold base 4 is fixedly connected to the mold core 5. Multiple positioning rods 6 are fixedly connected to the outside of the mold core 5. A venting mechanism is fixedly connected to the outside of the base plate 1. A driving mechanism is fixedly connected to the inside of the lower mold base 2.

[0035] The venting mechanism includes a mold cavity 7, which is a rectangular cavity with an open top. Its exterior is tightly fixed to the upper surface of the lower mold base 2, forming a complete injection space corresponding to the mold core 5. The exterior of the mold cavity 7 is fixedly connected to the exterior of the lower mold base 2. Multiple venting holes 8 are opened on the exterior of the mold cavity 7. The venting holes 8 are circular through holes with a diameter that has been precisely calculated to ensure venting efficiency and prevent molten plastic from overflowing. A follower plate 9 is fixedly connected to the exterior of the venting holes 8. The follower plate 9 is a circular thin plate that can move flexibly under gas pressure. A tension spring 10 is fixedly connected to the exterior of the follower plate 9. The tension spring 10 is normally in a compressed state, pressing the follower plate 9 against the outside of the venting holes 8. When the gas pressure inside the mold cavity 7 increases, the follower plate 9 can overcome the spring force and move outward to open the venting channel. A vacuum pump 11 is fixedly connected to the exterior of the base plate 1.

[0036] The output end of the vacuum pump 11 is fixedly connected to a connecting pipe 12. The connecting pipe 12 is a rigid pipe, and multiple air extraction pipes 13 are fixedly connected to its outside at equal intervals. The air extraction pipes 13 are respectively connected to the exhaust holes 8 of the mold cavity 7 to extract the air from the mold cavity 7. The output end of the vacuum pump 11 is fixedly connected to the connecting pipe 12, and multiple air extraction pipes 13 are fixedly connected to the outside of the connecting pipe 12. A support assembly is fixedly connected inside the upper mold base 4. The support assembly includes a support rod 14. Multiple support rods 14 are fixedly connected inside the upper mold base 4. A return spring 15 is sleeved on the outside of the support rod 14. The return spring 15 is compressed when the upper mold base 4 descends to close the mold, and provides an upward elastic force when the mold opens to assist the upper mold base 4 to return smoothly.

[0037] Reference Figures 3 to 5 The driving mechanism includes a hydraulic cylinder 16, which is externally fixedly connected to the inside of the lower mold base 2. A connecting rod 17 is fixedly connected to the driving end of the hydraulic cylinder 16. A guide groove 18 is provided inside the lower mold base 2. A follower block 19 is slidably connected inside the guide groove 18. The follower block 19 is a rectangular slider whose width is adapted to the width of the guide groove 18, allowing it to slide smoothly within the guide groove 18. The follower block 19 is slidably connected inside the guide groove 18. The follower block 19 is externally fixedly connected to the outside of the connecting rod 17. A connecting rod 20 is fixedly connected inside the follower block 19. Multiple pulleys 21 are fixedly connected to the outside of the connecting rod 20. The pulleys 21 are bearing structures and can rotate freely around the axis of the connecting rod 20. Their outer circumferential surface slides in cooperation with the guide groove 18 provided inside the lower mold base 2, providing auxiliary support and guidance for the movement of the follower block 19.

[0038] Multiple connecting plates 22 are fixedly connected to the outside of the follower block 19. A fixing block 23 is fixedly connected to the outside of the connecting plate 22. A support plate 24 is fixedly connected to the outside of the fixing block 23. A push plate 25 is vertically fixedly connected to the front end of the support plate 24. The push plate 25 is a rectangular flat plate with a flat surface and parallel to the side of the mold cavity 7. The support plate 24 is fixedly connected to the outside of the push plate 25. One end of the tension spring 10 is fixedly connected to the outside of the follower plate 9, and the other end of the tension spring 10 is fixedly connected to the inside of the lower mold base 2. When the air pressure inside the mold cavity 7 increases during the injection molding process, the gas pressure pushes the follower plate 9 to move outward, compressing the tension spring 10 and opening the exhaust channel. After the injection molding is completed, the follower plate 9 is reset under the action of the tension spring 10, closing the exhaust hole 8 to prevent the molten plastic from overflowing.

[0039] Working principle: When the injection mold is working, the upper mold base 4 descends along the guide post 3, and the mold core 5 is embedded into the mold cavity 7 to complete the mold closing. Molten plastic is injected into the space formed by the mold cavity 7 and the mold core 5. The air in the cavity is compressed and pushes the follower plate 9 to move outward against the elastic force of the tension spring 10. It is discharged through the exhaust hole 8, which then starts the vacuum pump 11. The vacuum pump is assisted by the connecting pipe 12 and the air extraction pipe 13 to ensure that the air in the cavity is completely discharged.

[0040] After the injection mold opens, the hydraulic cylinder 16 drives the connecting rod 17 to move, causing the connecting rod 17 to drive the follower block 19 to slide in the guide groove 18. Then, the pulley 21 rolls along the guide groove 18 to provide support, causing the follower block 19 to drive the connecting plate 22 to move, causing the fixed block 23 to drive the support plate 24 to move. Thus, the fixed block 23 drives the support plate 24 and the push plate 25 to move synchronously, thereby enabling the injection mold to automatically eject, avoiding product tearing or breakage, and improving demolding quality.

[0041] 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. An injection mold with an automatic venting device, comprising a base plate (1), characterized in that: The base plate (1) is fixedly connected to the outside of a lower mold base (2), the lower mold base (2) is fixedly connected to the outside of a plurality of guide pillars (3), the guide pillars (3) are fixedly connected to the outside of an upper mold base (4), the bottom of the upper mold base (4) is fixedly connected to a mold core (5), the outside of the mold core (5) is fixedly connected to a plurality of positioning rods (6), the base plate (1) is fixedly connected to the outside of an exhaust mechanism, and the lower mold base (2) is fixedly connected to the inside of a drive mechanism; The exhaust mechanism includes a mold cavity (7), which is fixedly connected to the outside of the lower mold base (2). Multiple exhaust holes (8) are provided on the outside of the mold cavity (7). A follower plate (9) is fixedly connected to the outside of the exhaust holes (8). A tension spring (10) is fixedly connected to the outside of the follower plate (9). A vacuum pump (11) is fixedly connected to the outside of the base plate (1). A connecting pipe (12) is fixedly connected to the output end of the vacuum pump (11). Multiple suction pipes (13) are fixedly connected to the outside of the connecting pipe (12). A support assembly is fixedly connected to the inside of the upper mold base (4).

2. The injection mold with an automatic venting device according to claim 1, characterized in that: The support assembly includes a support rod (14), and multiple support rods (14) are fixedly connected inside the upper mold base (4). A return spring (15) is sleeved on the outside of the support rod (14).

3. The injection mold with an automatic venting device according to claim 2, characterized in that: The driving mechanism includes a hydraulic cylinder (16), which is externally fixedly connected to the interior of the lower mold base (2), and a connecting rod (17) is fixedly connected to the driving end of the hydraulic cylinder (16).

4. An injection mold with an automatic venting device according to claim 3, characterized in that: The lower mold base (2) has a guide groove (18) inside, and a follower block (19) is slidably connected inside the guide groove (18). The follower block (19) is fixedly connected to the outside of the connecting rod (17).

5. An injection mold with an automatic venting device according to claim 4, characterized in that: The follower block (19) is internally fixedly connected to a connecting rod (20), and the connecting rod (20) is externally fixedly connected to multiple pulleys (21).

6. An injection mold with an automatic venting device according to claim 5, characterized in that: The follower block (19) is externally fixedly connected to multiple connecting plates (22), and the connecting plates (22) are externally fixedly connected to a fixing block (23).

7. An injection mold with an automatic venting device according to claim 6, characterized in that: The fixed block (23) is externally fixedly connected to a support plate (24), and the support plate (24) is externally fixedly connected to a push plate (25).

8. An injection mold with an automatic venting device according to claim 1, characterized in that: One end of the tension spring (10) is fixedly connected to the outside of the follower plate (9), and the other end of the tension spring (10) is fixedly connected to the inside of the lower mold base (2).

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