Nitrogen injection molding equipment and method

Abstract

The invention discloses nitrogen injection molding equipment and method. The injection molding equipment comprises a first injection mold, a second injection mold, an injection molding core and a nitrogen blowing device, and an injection molding cavity is formed in the second injection mold; the nitrogen blowing device comprises a nitrogen conveying mechanism, a nitrogen transferring mechanism, a nitrogen blowing-in guide pipe and a nitrogen temperature adjusting mechanism. The injection molding method comprises the steps that nitrogen is output from the nitrogen conveying mechanism and conveyed into the nitrogen temperature adjusting mechanism through the multiple nitrogen blowing-in guide pipes in the nitrogen transferring mechanism, the nitrogen temperature adjusting mechanism adjusts the temperature of the nitrogen, and the nitrogen is blown into an injection molding cavity in a layered mode through the multiple nitrogen blowing-in guide pipes; nitrogen uniformly enters the injection molding cavity in a layered mode, in the thick area of the plastic product, the nitrogen injection amount and pressure of each layer are accurately controlled through the nitrogen conveying mechanism, the hollow structure of the plastic product is more uniform in the thickness direction, the shrinkage and deformation problems of the plastic product can be effectively solved, and therefore the product quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding equipment, and in particular to a nitrogen injection molding equipment and method. Background Art

[0002] When plastic products are produced by injection molding equipment, local areas of the products with excessive wall thickness are prone to obvious shrinkage and concave deformation. These adverse phenomena not only affect the appearance of the products, but also lead to insufficient structural strength of the products, ultimately increasing the scrap rate of the products and failing to meet production and use requirements. Summary of the invention

[0003] In order to improve the defect that when thicker plastic products are injected, the product may shrink and deform, resulting in a decrease in product quality, the present application provides a nitrogen injection molding device and method.

[0004] The present application provides a nitrogen injection molding device and method using the following technical solutions: A nitrogen injection molding device comprises a first injection mold, a second injection mold corresponding to the first injection mold, an injection core arranged on the first injection mold, and a nitrogen blowing device inserted on the first injection mold and extending to the injection core, wherein the second injection mold is provided with an injection cavity for inserting the injection core; The nitrogen blowing device comprises a nitrogen delivery mechanism, a nitrogen transfer mechanism inserted on the first injection mold, a nitrogen blowing conduit inserted in the nitrogen transfer mechanism and connected to the nitrogen delivery mechanism, and a nitrogen temperature regulating mechanism connected to the first injection mold and located between the nitrogen delivery mechanism and the first injection mold; the nitrogen temperature regulating mechanism is connected to the nitrogen blowing conduit of the nitrogen transfer mechanism; One end of the nitrogen transport mechanism is inserted into the injection core and the other end extends to the outside of the second injection mold; a plurality of nitrogen blowing conduits are inserted into the nitrogen transport mechanism along the length direction of the nitrogen transport mechanism, and the open end of the nitrogen blowing conduit is connected to the injection cavity. The open ends of the plurality of nitrogen blowing conduits are arranged in an array along the length direction of the nitrogen transport mechanism to blow nitrogen into the injection cavity in layers.

[0005] By adopting the above technical scheme, nitrogen is output from the nitrogen delivery mechanism, and is delivered to the nitrogen temperature regulating mechanism through multiple nitrogen blowing conduits in the nitrogen transfer mechanism. The nitrogen temperature regulating mechanism regulates the temperature of the nitrogen and blows it into the injection molding cavity in layers through multiple nitrogen blowing conduits arranged along the length direction of the nitrogen transfer mechanism. The nitrogen of the present application can enter the injection molding cavity in layers and evenly, especially in the thicker areas of the plastic product. The nitrogen injection amount and pressure of each layer can be accurately controlled by the nitrogen delivery mechanism, so that the hollow structure of the plastic product is more uniform in the thickness direction, which can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving the product quality.

[0006] Preferably, the nitrogen blowing conduit includes a vertical pipe arranged along the length direction of the nitrogen transport mechanism, and a transverse pipe used to connect the vertical pipe with the injection cavity, and the open ends of a plurality of the transverse pipes are arranged in a vertical array along the length direction of the nitrogen transport mechanism.

[0007] By adopting the above technical solution, nitrogen enters multiple vertical pipes through a nitrogen delivery mechanism, and is then blown into the injection molding cavity in layers from different heights through multiple horizontal pipes, ensuring that the nitrogen is evenly distributed to various areas of the injection molding cavity; the present application uses a layered blowing method to effectively improve the shrinkage and deformation problems of thick-walled areas during the injection molding process, while improving the uniformity and quality of injection molded products.

[0008] Preferably, the first injection mold is provided with a plug hole for inserting the nitrogen transfer mechanism, the injection core is provided with a nitrogen blowing groove for connecting the plug hole and the injection cavity, and the end of the nitrogen transfer mechanism is inserted in the nitrogen blowing groove.

[0009] By adopting the above technical solution, the nitrogen transport mechanism passes through the plug-in hole, and the end of the nitrogen transport mechanism is inserted into the nitrogen blowing groove, thereby forming a complete nitrogen transport channel, and the nitrogen can enter the nitrogen blowing groove from the plug-in hole through the nitrogen blowing conduit in the nitrogen transport mechanism, and finally enter the injection cavity; the present application realizes efficient and smooth transmission of nitrogen from the nitrogen transport mechanism to the injection cavity, ensuring uniform distribution of nitrogen during the injection molding process, thereby reducing shrinkage and deformation of thick-walled areas.

[0010] Preferably, the nitrogen temperature regulating mechanism comprises a support frame connected to the second injection mold, and a refrigeration component connected to the support frame and located on the upper side of the support frame; the refrigeration component is connected to the nitrogen blowing conduit.

[0011] By adopting the above technical solution, the nitrogen is temperature-regulated by the refrigeration component before entering the injection molding cavity. Through the stable connection of the support frame, the refrigeration component can effectively cool the nitrogen and transport the temperature-adjusted nitrogen to the injection molding cavity through the nitrogen blowing conduit. The present application can assist in the cooling and molding of plastic products after injection molding by lowering the temperature of the nitrogen, thereby accelerating the production molding efficiency and improving the overall quality and precision of the injection molded products.

[0012] Preferably, the nitrogen temperature regulating mechanism further comprises a heating component connected to the support frame and located at the lower side of the support frame; the heating component is connected to the nitrogen blowing conduit for heating the nitrogen in the nitrogen blowing conduit.

[0013] By adopting the above technical solution, the heating component is used to heat the nitrogen in the nitrogen blowing conduit, and the heated nitrogen enters the injection molding cavity through the nitrogen blowing conduit, so as to be used to preheat the injection molding cavity and the injection molding raw materials at the beginning of injection molding, so as to improve the injection molding efficiency and quality; the present application can also flexibly adjust the temperature of the nitrogen to meet the needs of different injection molding processes, ensure that the nitrogen is in a suitable temperature range when entering the injection molding cavity, thereby optimizing the injection molding process, reducing product shrinkage and deformation, and improving product quality.

[0014] Preferably, the second injection mold is also provided with a pulse valve mechanism connected to the nitrogen transport mechanism; the pulse valve mechanism is located between the heating component and the second injection mold and is connected to the nitrogen blowing conduit.

[0015] By adopting the above technical solution, the pulse valve mechanism controls the pulse delivery of nitrogen, so that nitrogen can be blown into the injection cavity from the nitrogen inlet conduit in an intermittent manner; the present application can accurately adjust the delivery volume and delivery time of nitrogen through the control of the pulse valve mechanism, thereby avoiding the negative impact of excessive nitrogen on plastic products, while improving the uniform filling of thick-walled areas and further reducing shrinkage and deformation problems; the pulse valve mechanism is preferably a pulse valve.

[0016] Preferably, the nitrogen delivery mechanism comprises an air pump assembly connected to the nitrogen transport mechanism and in communication with the nitrogen blowing conduit, and a nitrogen generator, and the air pump assembly is located between the nitrogen generator and the refrigeration assembly.

[0017] By adopting the above technical solution, nitrogen is generated by a nitrogen generator and driven by an air pump assembly to transport nitrogen from the nitrogen blowing conduit in the nitrogen transport mechanism to the injection molding cavity; the present application realizes continuous and stable transportation of nitrogen from generation to the injection molding cavity through the efficient transportation of the air pump assembly, thereby effectively avoiding shrinkage and deformation problems in thick-walled areas and improving the quality and uniformity of injection molded products.

[0018] Preferably, the second injection mold is also provided with an overflow groove connected to the injection cavity.

[0019] By adopting the above technical solution, during the injection molding process, when the injection molding material is injected into the injection molding cavity, if the injection amount exceeds the volume of the injection molding cavity, the excess injection molding material will flow into the overflow groove, thereby avoiding overflow or contamination of the injection molding material and improving the neatness of production; the present application reduces material waste and environmental pollution by effectively collecting overflowed excess material, while improving the efficiency of the injection molding process and the qualified rate of the product, ensuring the quality of the final product and the economy of production.

[0020] A nitrogen injection molding method, comprising the nitrogen injection molding device, further comprising the following steps: S1: After the second injection mold and the first injection mold are molded together, the injection core is inserted into the injection cavity; S2: the first injection mold injects into the injection cavity, and the nitrogen blowing device blows nitrogen into the injection cavity; S3: the nitrogen temperature regulating mechanism regulates the nitrogen delivery temperature in the nitrogen blowing conduit so that the nitrogen delivery temperature gradually increases to perform injection molding preheating; S4: The nitrogen delivery mechanism is used to adjust the nitrogen flow rate and pressure in the plurality of nitrogen blowing conduits one by one, and blow nitrogen into the injection molded workpieces of different thicknesses in layers; when the preset thickness of the injection molded workpiece gradually increases, the flow rate and pressure of the nitrogen blown out from the corresponding nitrogen blowing conduit increase accordingly; S5: When the first injection mold completes injection molding into the injection cavity, the nitrogen temperature regulating mechanism regulates the nitrogen delivery temperature in the nitrogen blowing conduit to gradually reduce the nitrogen delivery temperature to assist in cooling the injection molded workpiece.

[0021] By adopting the above technical scheme, after the second injection mold and the first injection mold are molded together, the injection core is inserted into the injection cavity to form a complete injection space; the first injection mold injects into the injection cavity, and at the same time, the nitrogen blowing device blows nitrogen into the injection cavity to enhance the molding effect; the nitrogen temperature regulating mechanism adjusts the delivery temperature of the nitrogen in the nitrogen blowing conduit to gradually increase the delivery temperature of the nitrogen, thereby performing injection preheating; the nitrogen delivery mechanism adjusts the nitrogen flow and pressure in multiple nitrogen blowing conduits one by one to adapt to injection molded workpieces of different thicknesses, thereby ensuring Nitrogen can be blown in layers, and when the preset thickness of the molded workpiece gradually increases, the corresponding nitrogen flow and pressure also gradually increase; after the first injection mold completes injection molding into the injection cavity, the nitrogen temperature regulating mechanism adjusts the delivery temperature of the nitrogen again to gradually reduce the delivery temperature to assist in cooling the molded workpiece; the present application achieves efficient use of nitrogen during the injection molding process by regulating the temperature and controlling the flow of nitrogen, thereby ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the molded workpiece.

[0022] Preferably, step S5 further comprises the following steps: The nitrogen temperature regulating mechanism regulates the delivery temperature of the nitrogen in the plurality of nitrogen blowing conduits one by one. When the preset thickness of the injection molded workpiece gradually increases, the delivery temperature of the nitrogen blown out from the corresponding nitrogen blowing conduits decreases accordingly.

[0023] By adopting the above technical solution, when the preset thickness of the injection molded workpiece gradually increases, the nitrogen temperature regulating mechanism corresponding to the nitrogen blowing-out temperature of the nitrogen blowing-in duct gradually decreases to meet the temperature requirements of injection molded workpieces of different thicknesses, ensuring the cooling effect and molding quality of nitrogen during the injection molding process. The entire workflow is: This application improves the cooling efficiency of thick-walled injection molded workpieces by dynamically adjusting the delivery temperature of nitrogen, prevents product quality defects caused by excessive temperature, and thereby improves the overall performance and consistency of injection molded products.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. A nitrogen injection molding device, wherein nitrogen is output from a nitrogen delivery mechanism, and is delivered to a nitrogen temperature regulating mechanism through a plurality of nitrogen blowing conduits in the nitrogen transport mechanism. The nitrogen temperature regulating mechanism regulates the temperature of the nitrogen, and is blown into the injection molding cavity in layers through a plurality of nitrogen blowing conduits arranged along the length direction of the nitrogen transport mechanism; the nitrogen of the present application can enter the injection molding cavity in layers and uniformly, especially in the thicker area of ​​the plastic product, and the nitrogen injection amount and pressure of each layer can be accurately controlled by the nitrogen delivery mechanism, so that the hollow structure of the plastic product is more uniform in the thickness direction, which can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving the product quality; 2. A nitrogen injection molding device, wherein a heating component is used to heat the nitrogen in the nitrogen blowing conduit, and the heated nitrogen enters the injection molding cavity through the nitrogen blowing conduit, so as to preheat the injection molding cavity and the injection molding raw materials at the beginning of injection molding, so as to improve the injection molding efficiency and quality; the application can also flexibly adjust the temperature of the nitrogen to meet the needs of different injection molding processes, ensure that the nitrogen is in a suitable temperature range when entering the injection molding cavity, thereby optimizing the injection molding process, reducing the shrinkage and deformation of the product, and improving the product quality; 3. A nitrogen injection molding method, when the second injection mold and the first injection mold are molded together, the injection core is inserted into the injection cavity to form a complete injection molding space; the first injection mold injects into the injection cavity, and at the same time, the nitrogen blowing device blows nitrogen into the injection cavity to enhance the molding effect; the nitrogen temperature regulating mechanism adjusts the delivery temperature of the nitrogen in the nitrogen blowing conduit to gradually increase the delivery temperature of the nitrogen, thereby performing injection molding preheating; the nitrogen delivery mechanism adjusts the nitrogen flow and pressure in multiple nitrogen blowing conduits one by one to adapt to injection molded workpieces of different thicknesses to ensure Nitrogen can be blown in layers, and when the preset thickness of the molded workpiece gradually increases, the corresponding nitrogen flow and pressure also gradually increase; after the first injection mold completes injection molding into the injection cavity, the nitrogen temperature regulating mechanism adjusts the delivery temperature of the nitrogen again to gradually reduce the delivery temperature to assist in cooling the molded workpiece; the present application achieves efficient use of nitrogen during the injection molding process by regulating the temperature and controlling the flow of nitrogen, thereby ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the molded workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of a nitrogen injection molding equipment embodiment of the present application. Figure 1 .

[0026] Figure 2 for Figure 1 Enlarged view of part A.

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of a nitrogen injection molding equipment embodiment of the present application. Figure 2 .

[0028] Figure 4 It is a schematic diagram of the steps of a nitrogen injection molding method embodiment of the present application.

[0029] Description of reference numerals: 1. First injection mold; 11. Plug hole; 12. Nitrogen blowing groove; 2. Second injection mold; 3. Injection core; 4. Nitrogen blowing device; 41. Nitrogen delivery mechanism; 42. Nitrogen transfer mechanism; 43. Nitrogen blowing conduit; 44. Nitrogen temperature regulating mechanism; 411. Air pump assembly; 412. Nitrogen generator; 431. Vertical pipe fittings; 432. Horizontal pipe fittings; 441. Support frame; 442. Refrigeration assembly; 443. Heating assembly; 5. Injection cavity; 6. Pulse valve mechanism; 7. Overflow trough. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1 to 4 This application is described in further detail.

[0031] The present application discloses a nitrogen injection molding device and method. Figure 1 A nitrogen injection molding device comprises a first injection mold 1, a second injection mold 2 corresponding to the first injection mold 1, an injection core 3 arranged on the first injection mold 1, and a nitrogen blowing device 4 inserted on the first injection mold 1 and extending to the injection core 3, and an injection cavity 5 for inserting the injection core 3 is provided on the second injection mold 2; The nitrogen blowing device 4 includes a nitrogen delivery mechanism 41, a nitrogen transfer mechanism 42 inserted on the first injection mold 1, a nitrogen blowing conduit 43 inserted in the nitrogen transfer mechanism 42 and connected to the nitrogen delivery mechanism 41, and a nitrogen temperature regulating mechanism 44 connected to the first injection mold 1 and located between the nitrogen delivery mechanism 41 and the first injection mold 1; the nitrogen temperature regulating mechanism 44 is connected to the nitrogen blowing conduit 43 of the nitrogen transfer mechanism 42; One end of the nitrogen transport mechanism 42 is inserted into the injection core 3 and the other end extends to the outside of the second injection mold 2; a plurality of nitrogen blowing conduits 43 are inserted into the nitrogen transport mechanism 42 along the length direction of the nitrogen transport mechanism 42, and the open ends of the nitrogen blowing conduits 43 are connected to the injection cavity 5. The open ends of the plurality of nitrogen blowing conduits 43 are arranged in an array along the length direction of the nitrogen transport mechanism 42 to blow nitrogen into the injection cavity 5 in layers.

[0032] The nitrogen of the present application is output from the nitrogen delivery mechanism 41, and is delivered to the nitrogen temperature regulating mechanism 44 through multiple nitrogen blowing conduits 43 in the nitrogen transport mechanism 42. The nitrogen temperature regulating mechanism 44 regulates the temperature of the nitrogen, and blows the nitrogen into the injection cavity 5 in layers through multiple nitrogen blowing conduits 43 arranged along the length direction of the nitrogen transport mechanism 42; the nitrogen of the present application can enter the injection cavity 5 in layers and uniformly, especially in the thicker area of ​​the plastic product, the nitrogen injection amount and pressure of each layer can be accurately controlled by the nitrogen delivery mechanism 41, so that the hollow structure of the plastic product is more uniform in the thickness direction, which can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving the product quality; The nitrogen transport mechanism 42 is preferably a long rod column structure.

[0033] Furthermore, if Figure 2 As shown, the nitrogen blowing conduit 43 includes a vertical pipe 431 arranged along the length direction of the nitrogen transport mechanism 42, and a transverse pipe 432 for connecting the vertical pipe 431 with the injection cavity 5, and the open ends of the multiple transverse pipes 432 are arranged in a vertical array along the length direction of the nitrogen transport mechanism 42.

[0034] The vertical pipe fittings 431 of the present application are arranged along the length direction of the nitrogen transport mechanism 42, and the vertical pipe fittings 431 serve as the main channel for nitrogen transport; the transverse pipe fittings 432 are used to connect the vertical pipe fittings 431 with the injection cavity 5, and are arranged in a vertical array along the length direction of the nitrogen transport mechanism 42, and the open end of each transverse pipe fitting 432 is connected to the injection cavity 5 to ensure that the nitrogen can be accurately distributed inside the injection cavity 5; the nitrogen enters the multiple vertical pipe fittings 431 through the nitrogen transport mechanism 41, and then is blown into the injection cavity 5 in layers from different heights through the multiple transverse pipe fittings 432 to ensure that the nitrogen is evenly distributed to various areas of the injection cavity 5; the present application can effectively improve the shrinkage and deformation problems of the thick-walled area during the injection molding process through the layered blowing method, while improving the uniformity and quality of the injection molded products.

[0035] Furthermore, if Figure 2 As shown, the first injection mold 1 is provided with a plug hole 11 for inserting a nitrogen transfer mechanism 42, and the injection core 3 is provided with a nitrogen blowing groove 12 for connecting the plug hole 11 and the injection cavity 5, and the end of the nitrogen transfer mechanism 42 is inserted in the nitrogen blowing groove 12.

[0036] The nitrogen transport mechanism 42 of the present application passes through the plug hole 11, and the end of the nitrogen transport mechanism 42 is inserted into the nitrogen blowing groove 12, thereby forming a complete nitrogen delivery channel. Nitrogen can enter the nitrogen blowing groove 12 from the plug hole 11 through the nitrogen blowing conduit 43 in the nitrogen transport mechanism 42, and finally enter the injection cavity 5; the present application realizes efficient and smooth transmission of nitrogen from the nitrogen delivery mechanism 41 to the injection cavity 5, ensuring uniform distribution of nitrogen during the injection molding process, thereby reducing shrinkage and deformation of thick-walled areas.

[0037] Specifically, Figure 3 As shown, the nitrogen temperature regulating mechanism 44 includes a support frame 441 connected to the second injection mold 2 , and a refrigeration component 442 connected to the support frame 441 and located on the upper side of the support frame 441 ; the refrigeration component 442 is connected to the nitrogen blowing conduit 43 .

[0038] The support frame 441 of the present application is connected to the second injection mold 2 to provide stable structural support. The refrigeration component 442 is fixed on the upper side of the support frame 441 and is connected to the nitrogen blowing conduit 43. Before the nitrogen enters the injection cavity 5, the temperature is adjusted by the refrigeration component 442. Through the stable connection of the support frame 441, the refrigeration component 442 can effectively cool the nitrogen and transport the temperature-adjusted nitrogen to the injection cavity 5 through the nitrogen blowing conduit 43. The present application can assist in the cooling and molding of the plastic product after the injection molding by reducing the temperature of the nitrogen, thereby accelerating the production molding efficiency and improving the overall quality and precision of the injection molded product. The cooling assembly 442 is preferably a refrigerator.

[0039] More specifically, if Figure 3 As shown, the nitrogen temperature regulating mechanism 44 further includes a heating component 443 connected to the support frame 441 and located at the lower side of the support frame 441 ; the heating component 443 is connected to the nitrogen blowing conduit 43 to heat the nitrogen in the nitrogen blowing conduit 43 .

[0040] The heating component 443 of the present application is connected to the support frame 441, is located at the lower side of the support frame 441, and is connected to the nitrogen blowing conduit 43; the heating component 443 is used to heat the nitrogen in the nitrogen blowing conduit 43, and the heated nitrogen enters the injection cavity 5 through the nitrogen blowing conduit 43, so as to be used for preheating the injection cavity 5 and the injection molding raw materials at the beginning of injection molding, so as to improve the injection molding efficiency and quality; the present application can also flexibly adjust the temperature of the nitrogen to meet the needs of different injection molding processes, and ensure that the nitrogen is in a suitable temperature range when entering the injection cavity 5, so as to optimize the injection molding process, reduce the shrinkage and deformation of the product, and improve the product quality; The heating element 443 is preferably an electric heater.

[0041] In addition, if Figure 3 As shown, the second injection mold 2 is also provided with a pulse valve mechanism 6 connected to the nitrogen transport mechanism 42 ; the pulse valve mechanism 6 is located between the heating component 443 and the second injection mold 2 and is connected to the nitrogen blowing conduit 43 .

[0042] The pulse valve mechanism 6 of the present application controls the pulse delivery of nitrogen so that nitrogen can be blown into the injection cavity 5 from the nitrogen inlet conduit 43 in an intermittent manner; the pulse valve mechanism 6 of the present application can accurately adjust the delivery amount and delivery time of nitrogen to avoid the negative impact of excessive nitrogen on plastic products, while improving the uniform filling of thick-walled areas and further reducing shrinkage and deformation problems; the pulse valve mechanism 6 is preferably a pulse valve.

[0043] And, if Figure 3As shown, the nitrogen delivery mechanism 41 includes an air pump assembly 411 connected to the nitrogen transport mechanism 42 and communicated with the nitrogen blowing conduit 43, and a nitrogen generator 412, and the air pump assembly 411 is located between the nitrogen generator 412 and the refrigeration assembly 442.

[0044] In the present application, nitrogen is generated by a nitrogen generator 412 and driven by an air pump assembly 411, and nitrogen is blown into a nitrogen conduit 43 from a nitrogen transport mechanism 42 and transported to an injection molding cavity 5; in the present application, nitrogen is transported continuously and stably from generation to the injection molding cavity 5 through efficient transport by the air pump assembly 411, thereby effectively avoiding shrinkage and deformation problems in thick-walled areas and improving the quality and uniformity of injection molded products; The air pump assembly 411 is preferably a high-pressure air pump.

[0045] Furthermore, if Figure 3 As shown, the second injection mold 2 is also provided with an overflow groove 7 connected to the injection cavity 5 .

[0046] In the present application, during the injection molding process, when the injection molding material is injected into the injection molding cavity 5, if the injection amount exceeds the volume of the injection molding cavity 5, the excess injection molding material will flow into the overflow groove 7, thereby avoiding overflow or contamination of the injection molding material and improving the neatness of production; the present application reduces material waste and environmental pollution by effectively collecting overflowed excess material, while improving the efficiency of the injection molding process and the qualified rate of the product, ensuring the quality of the final product and the economy of production.

[0047] Furthermore, if Figure 4 As shown, a nitrogen injection molding method includes a nitrogen injection molding device and further includes the following steps: S1: After the second injection mold 2 and the first injection mold 1 are molded together, the injection core 3 is inserted into the injection cavity 5; S2: the first injection mold 1 injects into the injection cavity 5, and the nitrogen blowing device 4 blows nitrogen into the injection cavity 5; S3: The nitrogen temperature regulating mechanism 44 regulates the nitrogen delivery temperature in the nitrogen blowing conduit 43 so that the nitrogen delivery temperature gradually increases to perform injection molding preheating; S4: The nitrogen delivery mechanism 41 is used to adjust the nitrogen flow rate and pressure in the plurality of nitrogen blowing conduits 43 one by one, and blow nitrogen into the injection molded workpieces of different thicknesses in layers; when the preset thickness of the injection molded workpiece gradually increases, the flow rate and pressure of the nitrogen blown out from the corresponding nitrogen blowing conduit 43 increase accordingly; S5: When the first injection mold 1 completes injection molding into the injection cavity 5, the nitrogen temperature regulating mechanism 44 regulates the nitrogen delivery temperature in the nitrogen blowing conduit 43 to gradually reduce the nitrogen delivery temperature to assist in cooling the injection molded workpiece.

[0048] In the present application, after the second injection mold 2 and the first injection mold 1 are molded together, the injection core 3 is inserted into the injection cavity 5 to form a complete injection space; the first injection mold 1 injects into the injection cavity 5, and the nitrogen blowing device 4 blows nitrogen into the injection cavity 5 to enhance the molding effect; the nitrogen temperature regulating mechanism 44 regulates the conveying temperature of the nitrogen in the nitrogen blowing conduit 43, so that the conveying temperature of the nitrogen gradually increases, thereby performing injection preheating; the nitrogen conveying mechanism 41 regulates the nitrogen flow and pressure in the multiple nitrogen blowing conduits 43 one by one to adapt to injection molded workpieces of different thicknesses, Ensure that nitrogen can be blown in layers. When the preset thickness of the molded workpiece gradually increases, the corresponding nitrogen flow and pressure also gradually increase. After the first injection mold 1 completes injection molding into the injection cavity 5, the nitrogen temperature regulating mechanism 44 adjusts the delivery temperature of the nitrogen again to gradually reduce the delivery temperature to assist in cooling the molded workpiece. The present application achieves efficient use of nitrogen during the injection molding process by regulating the temperature and controlling the flow of nitrogen, thereby ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the molded workpiece.

[0049] Specifically, step S5 also includes the following steps: The nitrogen temperature regulating mechanism 44 regulates the nitrogen delivery temperature in the plurality of nitrogen blowing conduits 43 one by one. When the preset thickness of the injection molded workpiece gradually increases, the delivery temperature of the nitrogen blown out from the corresponding nitrogen blowing conduits 43 decreases accordingly.

[0050] In this application, when the preset thickness of the injection molded workpiece gradually increases, the nitrogen temperature regulating mechanism 44 corresponds to the nitrogen blowing conduit 43, and the delivery temperature of the nitrogen blown out gradually decreases accordingly, so as to adapt to the temperature requirements of injection molded workpieces of different thicknesses, and ensure the cooling effect and molding quality of nitrogen during the injection molding process. The entire workflow is: This application improves the cooling efficiency of thick-walled injection molded workpieces by dynamically adjusting the delivery temperature of nitrogen, prevents product quality defects caused by excessive temperature, and thereby improves the overall performance and consistency of injection molded products.

[0051] The implementation principle of a nitrogen injection molding device and method in the embodiment of the present application is: A nitrogen injection molding device, wherein nitrogen is output from a nitrogen delivery mechanism 41, and is delivered to a nitrogen temperature regulating mechanism 44 through a plurality of nitrogen blowing conduits 43 in a nitrogen transport mechanism 42. The nitrogen temperature regulating mechanism 44 regulates the temperature of the nitrogen, and is blown into an injection molding cavity 5 in layers through a plurality of nitrogen blowing conduits 43 arranged along the length direction of the nitrogen transport mechanism 42. The nitrogen of the present application can enter the injection molding cavity 5 in layers and uniformly, especially in the thicker area of ​​the plastic product, and the nitrogen delivery mechanism 41 can accurately control the nitrogen injection amount and pressure of each layer, so that the hollow structure of the plastic product is more uniform in the thickness direction, which can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving the product quality. The heating component 443 is connected to the support frame 441, located on the lower side of the support frame 441, and is connected to the nitrogen blowing conduit 43; the heating component 443 is used to heat the nitrogen in the nitrogen blowing conduit 43, and the heated nitrogen enters the injection cavity 5 through the nitrogen blowing conduit 43, so as to be used for preheating the injection cavity 5 and the injection molding raw materials at the beginning of injection molding, so as to improve the injection molding efficiency and quality; the present application can also flexibly adjust the temperature of the nitrogen to meet the needs of different injection molding processes, and ensure that the nitrogen is in a suitable temperature range when entering the injection cavity 5, thereby optimizing the injection molding process, reducing product shrinkage and deformation, and improving product quality.

[0052] A nitrogen injection molding method, when the second injection mold 2 and the first injection mold 1 are molded together, the injection core 3 is inserted into the injection cavity 5 to form a complete injection molding space; the first injection mold 1 injects into the injection cavity 5, and at the same time, a nitrogen blowing device 4 blows nitrogen into the injection cavity 5 to enhance the molding effect; a nitrogen temperature regulating mechanism 44 regulates the conveying temperature of nitrogen in a nitrogen blowing conduit 43, so that the conveying temperature of nitrogen gradually increases, thereby performing injection molding preheating; a nitrogen conveying mechanism 41 regulates the nitrogen flow and pressure in multiple nitrogen blowing conduits 43 one by one to adapt to injection molding of different thicknesses workpiece, ensuring that nitrogen can be blown in in layers. When the preset thickness of the molded workpiece gradually increases, the corresponding nitrogen flow rate and pressure also gradually increase. After the first injection mold 1 completes injection molding into the injection cavity 5, the nitrogen temperature regulating mechanism 44 adjusts the delivery temperature of the nitrogen again to gradually reduce the delivery temperature to assist in cooling the molded workpiece. The present application achieves efficient use of nitrogen during the injection molding process by regulating the temperature and controlling the flow of nitrogen, thereby ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the molded workpiece.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nitrogen injection molding equipment, characterized in that: The invention comprises a first injection mold (1), a second injection mold (2) corresponding to the first injection mold (1), an injection core (3) arranged on the first injection mold (1), and a nitrogen blowing device (4) inserted on the first injection mold (1) and extending to the injection core (3); the second injection mold (2) is provided with an injection cavity (5) for inserting the injection core (3); The nitrogen blowing device (4) comprises a nitrogen delivery mechanism (41), a nitrogen transfer mechanism (42) inserted on the first injection mold (1), a nitrogen blowing conduit (43) inserted in the nitrogen transfer mechanism (42) and connected to the nitrogen delivery mechanism (41), and a nitrogen temperature regulating mechanism (44) connected to the first injection mold (1) and located between the nitrogen delivery mechanism (41) and the first injection mold (1); the nitrogen temperature regulating mechanism (44) is connected to the nitrogen blowing conduit (43) of the nitrogen transfer mechanism (42); One end of the nitrogen transport mechanism (42) is inserted into the injection core (3) and the other end extends to the outside of the second injection mold (2); a plurality of nitrogen blowing conduits (43) are inserted into the nitrogen transport mechanism (42) along the length direction of the nitrogen transport mechanism (42), and the open end of the nitrogen blowing conduit (43) is connected to the injection cavity (5). The open ends of the plurality of nitrogen blowing conduits (43) are arranged in an array along the length direction of the nitrogen transport mechanism (42) so as to blow nitrogen into the injection cavity (5) in layers.

2. A nitrogen injection molding equipment according to claim 1, characterized in that: The nitrogen blowing conduit (43) comprises a vertical pipe (431) arranged along the length direction of the nitrogen transport mechanism (42), and a transverse pipe (432) used to connect the vertical pipe (431) and the injection cavity (5), and the open ends of the plurality of transverse pipes (432) are arranged in a vertical array along the length direction of the nitrogen transport mechanism (42).

3. A nitrogen injection molding equipment according to claim 1, characterized in that: The first injection mold (1) is provided with a plug hole (11) for inserting the nitrogen transfer mechanism (42), the injection core (3) is provided with a nitrogen blowing groove (12) for connecting the plug hole (11) and the injection cavity (5), and the end of the nitrogen transfer mechanism (42) is inserted into the nitrogen blowing groove (12).

4. A nitrogen injection molding equipment according to claim 1, characterized in that: The nitrogen temperature regulating mechanism (44) comprises a support frame (441) connected to the second injection mold (2), and a refrigeration component (442) connected to the support frame (441) and located on the upper side of the support frame (441); the refrigeration component (442) is in communication with the nitrogen blowing conduit (43).

5. A nitrogen injection molding equipment according to claim 4, characterized in that: The nitrogen temperature regulating mechanism (44) further comprises a heating component (443) connected to the support frame (441) and located at the lower side of the support frame (441); the heating component (443) is in communication with the nitrogen blowing conduit (43) to heat the nitrogen in the nitrogen blowing conduit (43).

6. A nitrogen injection molding equipment according to claim 5, characterized in that: The second injection mold (2) is also provided with a pulse valve mechanism (6) connected to the nitrogen transport mechanism (42); the pulse valve mechanism (6) is located between the heating component (443) and the second injection mold (2) and is connected to the nitrogen blowing conduit (43).

7. A nitrogen injection molding equipment according to claim 4, characterized in that: The nitrogen delivery mechanism (41) comprises an air pump assembly (411) connected to the nitrogen transport mechanism (42) and in communication with the nitrogen blowing conduit (43), and a nitrogen generator (412), wherein the air pump assembly (411) is located between the nitrogen generator (412) and the refrigeration assembly (442).

8. A nitrogen injection molding equipment according to claim 1, characterized in that: The second injection mold (2) is also provided with an overflow groove (7) which is in communication with the injection cavity (5).

9. A nitrogen injection molding method, characterized in that: A nitrogen injection molding device comprising any one of claims 1 to 8, further comprising the following steps: S1: After the second injection mold (2) and the first injection mold (1) are molded together, the injection core (3) is inserted into the injection cavity (5); S2: the first injection mold (1) performs injection molding into the injection cavity (5), and the nitrogen blowing device (4) blows nitrogen into the injection cavity (5); S3: the nitrogen temperature regulating mechanism (44) regulates the nitrogen delivery temperature in the nitrogen blowing conduit (43) so that the nitrogen delivery temperature gradually increases to perform injection molding preheating; S4: the nitrogen delivery mechanism (41) is used to adjust the nitrogen flow rate and pressure in the plurality of nitrogen blowing conduits (43) one by one, and to blow nitrogen into the injection molded workpieces of different thicknesses in layers; when the preset thickness of the injection molded workpiece gradually increases, the flow rate and pressure of the nitrogen blown out from the corresponding nitrogen blowing conduit (43) are increased accordingly; S5: When the first injection mold (1) completes injection molding into the injection cavity (5), the nitrogen temperature regulating mechanism (44) regulates the nitrogen delivery temperature in the nitrogen blowing conduit (43) so that the nitrogen delivery temperature gradually decreases, thereby assisting in cooling the injection molded workpiece.

10. A nitrogen injection molding method according to claim 9, characterized in that: Step S5 also includes the following steps: The nitrogen temperature regulating mechanism (44) regulates the delivery temperature of the nitrogen in the plurality of nitrogen blowing conduits (43) one by one, and when the preset thickness of the injection molded workpiece gradually increases, the delivery temperature of the nitrogen blown out from the corresponding nitrogen blowing conduit (43) decreases accordingly.

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