Multi-point hot runner pitched roof pouring mechanism of injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a multi-point hot runner inclined jacking pouring mechanism of an injection mold, which comprises a hot runner component and an inclined jacking pouring component, the upper end and the lower end of a hot runner plate are respectively connected with a panel and a front mold plate at intervals through heat insulation pads, and heat insulation bins are respectively attached and fixed on the inner side surfaces of the panel, the front mold plate and a front side plate; a plurality of heat insulation bins are arranged in the front side plate and enclose the flow dividing cavity, heat insulation cavities used for injecting inert gas are formed in the heat insulation bins, air inlet holes are formed in the panel, the front mold plate and the front side plate, air inlet pipes communicated with the heat insulation cavities are connected to the air inlet holes, and air stop valves are arranged at inlets of the air inlet pipes. The thermal insulation bin is arranged between the hot runner system and the mold, and the inert gas is injected into the thermal insulation bin, so that effective thermal insulation measures are added, the hot runner plate is uniformly heated in the injection molding process, and a mold cavity can be more uniformly filled with plastic.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds and relates to a multi-point hot runner inclined top pouring mechanism for an injection mold. Background Art

[0002] The mold using the hot runner system ensures that the plastic in the runner and gate remains in a molten state by heating. When the mold is opened, only the solidified product needs to be taken out without generating runner agglomerate. Compared with the traditional injection mold, its biggest feature is that it can improve the utilization rate of materials, reduce production costs, and ensure the quality of part molding. It is a hot direction in the development of plastic injection molding technology. According to the glue feeding form, it can be divided into single-point and multi-point types. The multi-point hot runner system is usually used for large plastic parts with one mold and one cavity or molds with multiple cavities in one mold; inclined ejection is a mechanism used in mold design to deal with internal undercuts or complex structures of products. It converts the vertical movement when the mold is opened into horizontal or oblique movement, thereby realizing the ejection and demoulding of internal undercuts or complex structures of the product.

[0003] The hot runner plate will produce severe thermal expansion after heating. In the existing technology, sufficient space is generally left between the hot runner system and the mold for expansion, and an insulation pad is added between the hot runner system and the mold to reduce the impact of the thermal bridge effect on the insulation effect. However, the insulation effect of the existing hot runner system is poor, resulting in severe heat loss and dissipation, making the hot runner plate unevenly heated during the injection molding process, increasing the residence time of the hot melt in the injection channel and causing deterioration. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and propose an injection mold multi-point hot runner inclined top pouring mechanism.

[0005] The purpose of the utility model can be achieved through the following technical solutions: an injection mold multi-point hot runner inclined top pouring mechanism, including a hot runner assembly and an inclined top pouring assembly, the hot runner assembly includes a panel, a front template, and a hot runner plate, the panel is provided with a hot nozzle and a positioning ring for connecting the injection molding machine nozzle, the inclined top pouring assembly includes a rear template, a bottom plate and a rear side plate connected between the rear template and the bottom plate, the front template and the rear template are buckled to form a cavity for molding products, a plurality of front side plates are provided between the panel and the front template, the hot runner plate is arranged in a diversion cavity formed by the panel, the front template and the plurality of front side plates, the front template is provided with a plurality of hot runners. The plate connection is used for injecting molten plastic into the cavity as a secondary hot nozzle, and a face needle plate and a bottom needle plate that overlap each other are slidably provided between the rear template and the bottom plate, and a pin is fixedly provided on the face needle plate and slides through the rear template, and the pin is provided with a slanted top, and the upper and lower ends of the hot runner plate are respectively connected to the panel and the front template through thermal insulation pads, and insulation bins are fixed on the inner sides of the panel, front template and front side plate, and several insulation bins enclose the diversion cavity, and the insulation bin has an insulation cavity for injecting inert gas, and the panel, front template and front side plate are all provided with air inlets, and the air inlet is connected to an air inlet pipe that passes through the insulation cavity, and an air stop valve is provided at the inlet of the air inlet pipe.

[0006] Preferably, a support plate with a sawtooth-shaped cross-section is provided in the insulation chamber, and the support plate divides the insulation chamber into a number of secondary insulation chambers that are interconnected.

[0007] Preferably, the insulation chamber is made of zirconia ceramic composite material.

[0008] Preferably, a gas pressure gauge is connected to the air inlet pipe.

[0009] Preferably, the distance between the hot runner plate and the insulation chamber is greater than 12 mm.

[0010] Preferably, a dust cover is threadedly connected to the inlet of the air intake pipe.

[0011] Preferably, the inert gas is one of argon, krypton and xenon.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] By setting up an insulation chamber between the hot runner system and the mold and injecting inert gas into the insulation chamber, effective thermal insulation measures are added to ensure that the hot runner plate is heated evenly during the injection molding process, thereby improving the heating balance, helping to reduce temperature fluctuations during the injection molding process, and allowing the plastic to fill the mold cavity more evenly; by maintaining the stability of the hot runner plate temperature, the residence time of the hot melt in the injection channel is reduced, avoiding the deterioration of the plastic due to long-term high-temperature residence; the insulation, heat preservation and anti-corrosion effects are good, and the structure is stable and safe, avoiding large-area contact between the hot runner system and the mold, reducing heat loss, and being more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0015] Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A.

[0016] In the figure, 1. hot runner assembly; 11. panel; 12. front template; 13. hot runner plate; 14. front side plate; 15. diversion cavity; 2. inclined ejector assembly; 21. rear template; 22. bottom plate; 23. rear side plate; 24. face needle plate; 25. bottom needle plate; 26. ejector pin; 27. inclined ejector; 3. hot nozzle; 4. positioning ring; 5. cavity; 6. secondary hot nozzle; 7. thermal insulation pad; 8. thermal insulation chamber; 81. thermal insulation cavity; 811. secondary thermal insulation cavity; 82. air inlet; 83. air inlet pipe; 831. dust cover; 84. air stop valve; 85. support plate; 9. gas pressure gauge. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1-Figure 2As shown, a multi-point hot runner inclined top pouring mechanism for an injection mold includes a hot runner component 1 and an inclined top pouring component 2, the hot runner component 1 includes a panel 11, a front template 12, and a hot runner plate 13, the panel 11 is provided with a hot nozzle 3 and a positioning ring 4 for connecting the nozzle of an injection molding machine, the inclined top pouring component 2 includes a rear template 21, a bottom plate 22 and a rear side plate 23 connected between the rear template 21 and the bottom plate 22, the front template 12 and the rear template 21 are buckled to form a cavity 5 for molding a product, characterized in that a plurality of front side plates 14 are provided between the panel 11 and the front template 12, the hot runner plate 13 is arranged in a diversion cavity 15 formed by the panel 11, the front template 12 and the plurality of front side plates 14, the front template 12 is provided with a plurality of hot runner plates 13 connected to the hot runner plate 13 for injecting into the cavity 5 A secondary hot nozzle 6 for injecting molten plastic, a surface needle plate 24 and a bottom needle plate 25 that overlap each other are slidably provided between the rear template 21 and the bottom plate 22, the surface needle plate 24 is fixedly connected with an ejector pin 26 that is inclined and slidably penetrates the rear template 21, and the ejector pin 26 is provided with a slanted top 27, the upper and lower ends of the hot runner plate 13 are respectively connected to the panel 11 and the front template 12 through the thermal insulation pad 7, and the inner sides of the panel 11, the front template 12 and the front side plate 14 are all fitted with insulation bins 8, and several of the insulation bins 8 enclose the diversion cavity 15, and the insulation bin 8 has an insulation cavity 81 for injecting inert gas, and the panel 11, the front template 12 and the front side plate 14 are all provided with air inlet holes 82, and the air inlet hole 82 is connected to an air inlet pipe 83 that passes through the insulation cavity 81, and the inlet of the air inlet pipe 83 is provided with an air stop valve 84.

[0019] In this embodiment, the injection molding machine nozzle injects molten plastic into the hot nozzle 3, and the hot nozzle 3 heats and insulates the molten plastic in the runner to ensure that the molten plastic can smoothly enter the hot runner plate 13. The thermal insulation pad 7 is made of insulating and poorly thermally conductive materials. Its main function is to suspend the hot runner plate 13 to avoid contact between the hot runner plate 13 and the mold, reduce the thermal bridge effect and prevent a large amount of heat loss from the hot runner plate 13. The insulation chamber 8 is fitted on the inner side of the panel 11, the front template 12 and the front side plate 14 and encloses the diversion cavity 15. Inert gas is injected into the insulation cavity 81. The chemical properties of the inert gas are very stable and its thermal conductivity is worse than that of air, so that the insulation chamber 8 can effectively block heat conduction and ensure The heat-retaining runner plate 13 is heated evenly during the injection molding process, thereby improving the heating balance, helping to reduce temperature fluctuations during the injection molding process, and allowing the plastic to more evenly fill the mold cavity. By maintaining the temperature stability of the hot runner plate 13, the residence time of the hot melt in the injection molding channel is reduced, and the plastic is prevented from deteriorating due to long-term high-temperature residence. In addition, inert gases generally have antioxidant properties, and molds are generally made of metal materials. Therefore, even if leaked, they will not react with the plastic. Instead, filling the mold will play a certain role in antioxidant and corrosion resistance, making it safe to use and prolonging the service life of the mold. When the inert gas leaks, it can be easily replenished into the insulation cavity 81 through the air stop valve 84.

[0020] The hot runner plate 13 diverts the molten plastic to each secondary hot nozzle 6 for heating and insulation, and then injects it into the cavity 5 to form a product. During demoulding, the ejection mechanism pushes the bottom needle plate 25 and the surface needle plate 24 overlapped with it to slide, so that the inclined ejector pins 26 slide along the rear template 21, converting the vertical movement when the mold is opened into oblique movement, thereby realizing the ejection and demoulding of the internal undercut or complex structure of the product.

[0021] In this embodiment, if Figure 2 As shown, the insulation chamber 8 is provided with a support plate 85 having a sawtooth-shaped cross-section. The support plate 85 divides the insulation chamber 81 into a plurality of interconnected secondary insulation chambers 811. The support plate 85 supports and strengthens the internal structure of the insulation chamber 8, enabling the insulation chamber 8 to withstand higher pressures of inert gas, thereby improving the insulation effect. The inert gas flows through the complex channels of the interconnected secondary insulation chambers 811, effectively preventing heat transfer and loss.

[0022] The insulation chamber 8 is made of a zirconium oxide ceramic composite material. Zirconia ceramic composite material has high strength and a low thermal conductivity. Its thermal expansion coefficient is close to that of steel, which helps to reduce the thermal stress generated by the composite material during temperature changes.

[0023] In this embodiment, a gas pressure gauge 9 is connected to the air inlet pipe 83. The gas pressure gauge 9 can visually monitor the inert gas pressure in the insulation chamber 81 in real time. When the gas pressure decreases slightly, it can be replenished promptly through the air stop valve 84. When the gas pressure decreases significantly, it indicates a large leak and requires repair. Because the insulation chambers 8 on the inner side of the panel 11, the front template 12, and the front side panels 14 are all installed independently, only the leaking insulation chamber 8 needs to be found for maintenance and repair, which can reduce the difficulty and cost of maintenance.

[0024] Furthermore, the distance between the hot runner plate 3 and the insulation chamber 8 is greater than 12 mm. The hot runner plate 13 is usually made of materials such as steel, beryllium copper or copper. The thermal expansion coefficients of these materials vary. The size and shape of the hot runner plate 13 will also affect its thermal expansion range. The injection molding mold needs to maintain the mold temperature within a certain range, usually between 20 and 200 ° C. Under normal circumstances, the thermal expansion of the hot runner plate 13 may reach about 0.3 mm. The air gap distance should be no less than 8 mm to ensure effective thermal insulation. Therefore, a redundant design is implemented to ensure safety and thermal insulation.

[0025] The inlet of the air inlet pipe 83 is threadedly connected with a dust cover 831. The function of the dust cover 831 is to prevent dust or debris from entering the air inlet pipe 83 and to prevent the air stop valve 84 from leaking or accidentally touching.

[0026] Furthermore, the inert gas is one of argon, krypton and xenon. The above inert gas has low thermal conductivity, stable properties, is easy to obtain and has low cost.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A multi-point hot runner inclined top pouring mechanism for an injection mold, comprising a hot runner assembly (1) and an inclined top pouring assembly (2), wherein the hot runner assembly (1) comprises a panel (11), a front template (12), and a hot runner plate (13), wherein the panel (11) is provided with a hot nozzle (3) and a positioning ring (4) for connecting to a nozzle of an injection molding machine, wherein the inclined top pouring assembly (2) comprises a rear template (21), a bottom plate (22), and a rear side plate (23) connected between the rear template (21) and the bottom plate (22), wherein the front template (12) and the rear template (21) are engaged to form a cavity (5) for molding a product, wherein the cavity (5) is formed. A plurality of front side plates (14) are provided between the panel (11) and the front template (12); the hot runner plate (13) is provided in a diversion cavity (15) formed by the panel (11), the front template (12) and the plurality of front side plates (14); the front template (12) is provided with a plurality of secondary hot nozzles (6) connected to the hot runner plate (13) for injecting molten plastic into the cavity (5); a face needle plate (24) and a bottom needle plate (25) are provided between the rear template (21) and the bottom plate (22) for sliding and overlapping; a top needle (26) is fixedly connected to the face needle plate (24) and is provided with an inclined top (26) which is provided and slides through the rear template (21); and the top needle (26) is provided with an inclined top (26) 7), the upper and lower ends of the hot runner plate (13) are spaced apart and connected to the panel (11) and the front template (12) respectively through the thermal insulation pad (7), the panel (11), the front template (12) and the inner side of the front side plate (14) are all fixed with thermal insulation chambers (8), a plurality of the thermal insulation chambers (8) enclose the diversion cavity (15), and the thermal insulation chamber (8) has a thermal insulation cavity (81) for injecting inert gas, the panel (11), the front template (12) and the front side plate (14) are all provided with air inlet holes (82), the air inlet hole (82) is connected to an air inlet pipe (83) that passes through the thermal insulation cavity (81), and the inlet of the air inlet pipe (83) is provided with an air stop valve (84).

2. The multi-point hot runner inclined top pouring mechanism for injection mold according to claim 1, characterized in that: A support plate (85) with a sawtooth-shaped cross section is provided in the thermal insulation chamber (8), and the support plate (85) divides the thermal insulation chamber (81) into a plurality of secondary thermal insulation chambers (811) that are interconnected.

3. The multi-point hot runner inclined top pouring mechanism for injection mold according to claim 2, characterized in that: The material of the thermal insulation chamber (8) is a zirconium oxide ceramic composite material.

4. The multi-point hot runner inclined top pouring mechanism for an injection mold according to any one of claims 1 or 2, characterized in that: The air inlet pipe (83) is connected to a gas pressure gauge (9).

5. The multi-point hot runner inclined jacking pouring mechanism for injection mold according to claim 1, characterized in that: The distance between the hot runner plate (13) and the temperature-isolating chamber (8) is greater than 12 mm.

6. The multi-point hot runner inclined jacking pouring mechanism for injection mold according to claim 1, characterized in that: The inlet of the air inlet pipe (83) is threadedly connected with a dust cover (831).

7. The multi-point hot runner inclined jacking pouring mechanism for injection mold according to claim 1, characterized in that: The inert gas is one of argon, krypton and xenon.

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