A nitrogen injection molding equipment and method

Abstract

This application discloses a nitrogen injection molding equipment and method. The injection molding equipment includes a first injection mold, a second injection mold, an injection core, and a nitrogen blowing device. The second injection mold has an injection cavity. The nitrogen blowing device includes a nitrogen delivery mechanism, a nitrogen transfer mechanism, a nitrogen blowing conduit, and a nitrogen temperature regulating mechanism. In the injection molding method, nitrogen is output from the nitrogen delivery mechanism and delivered to the nitrogen temperature regulating mechanism through multiple nitrogen blowing conduits within the nitrogen transfer mechanism. The nitrogen temperature regulating mechanism regulates the temperature of the nitrogen and blows it into the injection cavity in layers through the multiple nitrogen blowing conduits. In this application, the nitrogen enters the injection cavity in layers evenly. In the thicker areas of the plastic product, the nitrogen delivery mechanism precisely controls the amount and pressure of nitrogen injected into each layer, making the hollow structure of the plastic product more uniform in the thickness direction. This effectively alleviates the shrinkage and deformation problems of the plastic product, thereby improving product quality.

Description

Technical Field

[0001] This application relates to the field of injection molding equipment technology, and in particular to a nitrogen injection molding equipment and method. Background Technology

[0002] When producing plastic products using injection molding equipment, significant shrinkage and dent deformation can easily occur in localized areas with excessive wall thickness. These defects not only affect the appearance of the products but also lead to insufficient structural strength, ultimately increasing the scrap rate and failing to meet production and usage requirements. Summary of the Invention

[0003] In order to improve the defect that shrinkage and deformation occur when injection molding thicker plastic products, resulting in a decrease in product quality, this application provides a nitrogen injection molding equipment and method.

[0004] The nitrogen injection molding equipment and method provided in this application adopt the following technical solution:

[0005] A nitrogen injection molding machine includes a first injection mold, a second injection mold corresponding to and cooperating with the first injection mold, an injection core disposed on the first injection mold, and a nitrogen blowing device inserted into the first injection mold and extending to the injection core. The second injection mold is provided with an injection cavity for the injection core to be inserted.

[0006] The nitrogen blowing device includes a nitrogen delivery mechanism, a nitrogen transfer mechanism inserted into the first injection mold, a nitrogen blowing conduit inserted into 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.

[0007] One end of the nitrogen transfer mechanism is inserted into the injection molding 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 transfer mechanism along the length direction of the nitrogen transfer mechanism, the opening end of the nitrogen blowing conduit is connected to the injection molding cavity, and the opening ends of the plurality of nitrogen blowing conduits are arranged in an array along the length direction of the nitrogen transfer mechanism to blow nitrogen into the injection molding cavity in layers.

[0008] By adopting the above technical solution, nitrogen is output from the nitrogen delivery mechanism, and then transported to the nitrogen temperature regulation mechanism through multiple nitrogen blowing conduits within the nitrogen transfer mechanism. The nitrogen temperature regulation mechanism regulates the temperature of the nitrogen, and the nitrogen is blown into the injection molding cavity in layers through multiple nitrogen blowing conduits arranged along the length of the nitrogen transfer mechanism. The nitrogen in this application can enter the injection molding cavity in layers evenly, especially in the thicker areas of the plastic product. By precisely controlling the amount and pressure of nitrogen injection in each layer through the nitrogen delivery mechanism, the hollow structure of the plastic product is made more uniform in the thickness direction, which can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving product quality.

[0009] Preferably, the nitrogen blowing conduit includes a vertical tube arranged along the length of the nitrogen transfer mechanism, and a horizontal tube for connecting the vertical tube to the injection molding cavity, wherein the open ends of a plurality of the horizontal tubes are arranged in a vertical array along the length of the nitrogen transfer mechanism.

[0010] By adopting the above technical solution, nitrogen gas enters multiple vertical pipes through a nitrogen gas delivery mechanism, and then is blown into the injection cavity from different heights through multiple horizontal pipes, ensuring that the nitrogen gas is evenly distributed to all areas of the injection cavity. This application can effectively improve the shrinkage and deformation problems in thick-walled areas during the injection molding process through the layered blowing method, while improving the uniformity and quality of the injection molded products.

[0011] Preferably, the first injection mold is provided with a insertion hole for the nitrogen transfer mechanism to be inserted, the injection core is provided with a nitrogen inlet groove for connecting the insertion hole and the injection cavity, and the end of the nitrogen transfer mechanism is inserted into the nitrogen inlet groove.

[0012] By adopting the above technical solution, the nitrogen transfer mechanism passes through the insertion hole, and the end of the nitrogen transfer mechanism is inserted into the nitrogen inlet groove, thereby forming a complete nitrogen delivery channel. Nitrogen can enter the nitrogen inlet groove from the insertion hole through the nitrogen inlet conduit in the nitrogen transfer mechanism, and finally enter the injection molding cavity. This application realizes the efficient and smooth transmission of nitrogen from the nitrogen transfer mechanism to the injection molding cavity, ensuring the uniform distribution of nitrogen in the injection molding process, thereby reducing shrinkage and deformation in thick-walled areas.

[0013] Preferably, the nitrogen temperature regulating mechanism includes a support frame connected to the second injection mold, and a cooling component connected to the support frame and located on the upper side of the support frame; the cooling component is in communication with the nitrogen blowing conduit.

[0014] By adopting the above technical solution, nitrogen gas undergoes temperature regulation by a cooling component before entering the injection molding cavity. Through the stable connection of the support frame, the cooling component can effectively cool the nitrogen gas, and the temperature-adjusted nitrogen gas is delivered to the injection molding cavity through a nitrogen gas blowing conduit. This application can assist in the cooling and molding of plastic products after injection molding by reducing the temperature of nitrogen gas, thereby accelerating the production molding efficiency and improving the overall quality and precision of injection molded products.

[0015] Preferably, the nitrogen temperature regulating mechanism further includes a heating component connected to the support frame and located on the lower side of the support frame; the heating component is in communication with the nitrogen inlet conduit to heat the nitrogen in the nitrogen inlet conduit.

[0016] By adopting the above technical solution, the heating component is used to heat the nitrogen gas blown into the nitrogen conduit. The heated nitrogen gas then enters the injection cavity through the nitrogen gas blown into the nitrogen conduit to preheat the injection cavity and the injection material at the beginning of injection molding, thereby improving injection efficiency and quality. This application can also flexibly adjust the temperature of the nitrogen gas to adapt to the needs of different injection molding processes, ensuring that the nitrogen gas is within a suitable temperature range when entering the injection cavity, thereby optimizing the injection molding process, reducing product shrinkage and deformation, and improving product quality.

[0017] Preferably, the second injection mold is further provided with a pulse valve mechanism connected to the nitrogen transfer mechanism; the pulse valve mechanism is located between the heating component and the second injection mold and is connected to the nitrogen blowing conduit.

[0018] By adopting the above technical solution, the pulse valve mechanism controls the pulse delivery of nitrogen, enabling nitrogen to be blown into the injection cavity from the nitrogen inlet tube in an intermittent manner. Through the control of the pulse valve mechanism, this application can precisely adjust the delivery amount and delivery time of nitrogen, avoid the negative impact of excessive nitrogen on plastic products, and improve the uniform filling of thick-walled areas, further reducing shrinkage and deformation problems. The pulse valve mechanism is preferably a pulse valve.

[0019] Preferably, the nitrogen delivery mechanism includes a gas pump assembly connected to the nitrogen transfer mechanism and communicating with the nitrogen blowing conduit, and a nitrogen generator, wherein the gas pump assembly is located between the nitrogen generator and the refrigeration assembly.

[0020] By adopting the above technical solution, nitrogen is generated by a nitrogen generator and driven by an air pump assembly to blow nitrogen from the nitrogen transfer mechanism into the conduit and deliver it to the injection molding cavity. This application achieves continuous and stable delivery of nitrogen from generation to the injection molding cavity through the efficient delivery 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.

[0021] Preferably, the second injection mold is further provided with an overflow groove that communicates with the injection cavity.

[0022] By adopting the above technical solution, during the injection molding process, if the injection volume exceeds the volume of the injection mold cavity when the injection material is injected into the injection cavity, the excess injection material will flow into the overflow groove, thereby avoiding the overflow or contamination of the injection material and improving the cleanliness of the production. This application reduces material waste and environmental pollution by effectively collecting the overflowed excess material, while improving the efficiency of the injection molding process and the product qualification rate, ensuring the quality of the final product and the economy of production.

[0023] A nitrogen injection molding method, comprising the aforementioned nitrogen injection molding equipment, further comprising the following steps:

[0024] S1: After the second injection mold and the first injection mold are closed, the injection core is inserted into the injection cavity;

[0025] S2: The first injection mold injects molded material into the injection cavity, and the nitrogen blowing device blows nitrogen into the injection cavity;

[0026] S3: The nitrogen temperature regulating mechanism regulates the delivery temperature of the nitrogen gas blown into the duct, so that the delivery temperature of the nitrogen gas gradually increases, in order to preheat the injection molding process.

[0027] S4: The nitrogen delivery mechanism is used to adjust the flow rate and pressure of nitrogen in multiple nitrogen blowing conduits one by one, and to blow nitrogen in layers for injection molded workpieces of different thicknesses; 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.

[0028] S5: When the first injection mold completes the injection molding into the injection cavity, the nitrogen temperature regulating mechanism adjusts the delivery temperature of the nitrogen in the nitrogen blowing into the conduit, so that the delivery temperature of the nitrogen gradually decreases, so as to provide auxiliary cooling for the injection molded workpiece.

[0029] By adopting the above technical solution, after the second injection mold and the first injection mold are closed, the injection core is inserted into the injection cavity, forming a complete injection space; the first injection mold injects molded material into the injection cavity, while 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, so that the delivery temperature of the nitrogen gradually increases, thereby preheating the injection molding; the nitrogen delivery mechanism adjusts the nitrogen flow rate and pressure in multiple nitrogen blowing conduits one by one to adapt to injection molded workpieces of different thicknesses, ensuring... Nitrogen can be blown in layers. As the preset thickness of the injection molded workpiece gradually increases, the corresponding nitrogen flow rate and pressure also gradually increase. After the first injection mold completes the injection into the injection cavity, the nitrogen temperature regulation mechanism adjusts the nitrogen delivery temperature again to gradually reduce the delivery temperature, thereby providing auxiliary cooling for the injection molded workpiece. This application achieves efficient utilization of nitrogen during the injection molding process by regulating the temperature and controlling the flow rate of nitrogen, ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the injection molded workpiece.

[0030] Preferably, step S5 further includes the following steps:

[0031] The nitrogen temperature regulating mechanism adjusts the delivery temperature of nitrogen in the multiple nitrogen blowing into the ducts one by one. When the preset thickness of the injection molded workpiece gradually increases, the delivery temperature of the nitrogen blowing out from the corresponding nitrogen blowing into the duct decreases accordingly.

[0032] By adopting the above technical solution, as the preset thickness of the injection-molded workpiece gradually increases, the nitrogen temperature regulation mechanism correspondingly decreases the delivery temperature of the nitrogen blowing into the nitrogen blowing duct, in order 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 as follows: This application improves the cooling efficiency of thick-walled injection-molded workpieces by dynamically adjusting the delivery temperature of nitrogen, preventing quality defects caused by excessive temperature, and thus improving the overall performance and consistency of the injection-molded products.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 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 multiple nitrogen blowing conduits within the nitrogen transfer mechanism. The nitrogen temperature regulating mechanism regulates the temperature of the nitrogen, and the nitrogen is blown into the injection molding cavity in layers through multiple nitrogen blowing conduits arranged along the length of the nitrogen transfer mechanism. The nitrogen in this application can enter the injection molding cavity in layers evenly, especially in thicker areas of the plastic product. By precisely controlling the nitrogen injection volume and pressure of each layer through the nitrogen delivery mechanism, the hollow structure of the plastic product becomes more uniform in the thickness direction, effectively alleviating shrinkage and deformation problems, thereby improving product quality.

[0035] 2. A nitrogen injection molding device, wherein a heating component is used to heat the nitrogen gas blown into a conduit, and the heated nitrogen gas enters the injection cavity through the nitrogen gas blown into the conduit to preheat the injection cavity and the injection material at the start of injection molding, thereby improving injection efficiency and quality; this application also enables flexible adjustment of the nitrogen gas temperature to adapt to the needs of different injection molding processes, ensuring that the nitrogen gas is within a suitable temperature range when entering the injection cavity, thereby optimizing the injection molding process, reducing product shrinkage and deformation, and improving product quality;

[0036] 3. A nitrogen injection molding method, wherein after the second injection mold and the first injection mold are closed, an injection core is inserted into the injection cavity to form a complete injection space; the first injection mold injects material into the injection cavity, and simultaneously a nitrogen blowing device blows nitrogen into the injection cavity to enhance the molding effect; a nitrogen temperature regulating mechanism regulates the delivery temperature of nitrogen in the nitrogen blowing conduit, so that the delivery temperature of nitrogen gradually increases, thereby preheating the injection molding; a nitrogen delivery mechanism adjusts the nitrogen flow rate and pressure in multiple nitrogen blowing conduits one by one to adapt to injection molded workpieces of different thicknesses, ensuring Nitrogen can be blown in layers. As the preset thickness of the injection molded workpiece gradually increases, the corresponding nitrogen flow rate and pressure also gradually increase. After the first injection mold completes the injection into the injection cavity, the nitrogen temperature regulation mechanism adjusts the nitrogen delivery temperature again to gradually reduce the delivery temperature, thereby providing auxiliary cooling for the injection molded workpiece. This application achieves efficient utilization of nitrogen during the injection molding process by regulating the temperature and controlling the flow rate of nitrogen, ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the injection molded workpiece. Attached Figure Description

[0037] Figure 1 This is a schematic cross-sectional view of an embodiment of a nitrogen injection molding equipment according to this application. Figure 1 .

[0038] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0039] Figure 3This is a schematic cross-sectional view of an embodiment of a nitrogen injection molding equipment according to this application. Figure 2 .

[0040] Figure 4 This is a schematic flowchart illustrating the steps of an embodiment of a nitrogen injection molding method according to this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. First injection mold; 11. Insertion hole; 12. Nitrogen inlet trough; 2. Second injection mold; 3. Injection core; 4. Nitrogen blowing device; 41. Nitrogen conveying mechanism; 42. Nitrogen transfer mechanism; 43. Nitrogen inlet conduit; 44. Nitrogen temperature regulating mechanism; 411. Air pump assembly; 412. Nitrogen generator; 431. Vertical pipe fitting; 432. Horizontal pipe fitting; 441. Support frame; 442. Refrigeration assembly; 443. Heating assembly; 5. Injection cavity; 6. Pulse valve mechanism; 7. Overflow trough. Detailed Implementation

[0043] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0044] This application discloses a nitrogen injection molding apparatus and method. (Refer to...) Figure 1 A nitrogen injection molding device includes a first injection mold 1, a second injection mold 2 corresponding to and cooperating with the first injection mold 1, an injection core 3 disposed on the first injection mold 1, and a nitrogen blowing device 4 inserted into 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 the injection core 3 to be inserted.

[0045] The nitrogen blowing device 4 includes a nitrogen delivery mechanism 41, a nitrogen transfer mechanism 42 inserted into the first injection mold 1, a nitrogen blowing conduit 43 inserted into 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.

[0046] One end of the nitrogen transfer mechanism 42 is inserted into the injection core 3 and the other end extends to the outside of the second injection mold 2; multiple nitrogen blowing conduits 43 are inserted into the nitrogen transfer mechanism 42 along the length direction of the nitrogen transfer mechanism 42, the opening end of the nitrogen blowing conduit 43 is connected to the injection cavity 5, and the opening ends of the multiple nitrogen blowing conduits 43 are arranged in an array along the length direction of the nitrogen transfer mechanism 42 to blow nitrogen into the injection cavity 5 in layers.

[0047] In this application, nitrogen is output from the nitrogen delivery mechanism 41, and then transported to the nitrogen temperature regulating mechanism 44 through multiple nitrogen blowing conduits 43 within the nitrogen transfer mechanism 42. The nitrogen temperature regulating mechanism 44 regulates the temperature of the nitrogen and blows it into the injection molding cavity 5 in layers through multiple nitrogen blowing conduits 43 arranged along the length of the nitrogen transfer mechanism 42. The nitrogen in this application can enter the injection molding cavity 5 in layers evenly. Especially in the thicker areas of the plastic product, the nitrogen delivery mechanism 41 precisely controls the amount and pressure of nitrogen injected into each layer, making the hollow structure of the plastic product more uniform in the thickness direction. This can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving product quality.

[0048] The nitrogen transfer mechanism 42 is preferably a long rod column structure.

[0049] Furthermore, if Figure 2 As shown, the nitrogen blowing conduit 43 includes a vertical tube 431 arranged along the length of the nitrogen transfer mechanism 42, and a horizontal tube 432 for connecting the vertical tube 431 and the injection molding cavity 5. The open ends of the multiple horizontal tubes 432 are arranged in a vertical array along the length of the nitrogen transfer mechanism 42.

[0050] The vertical pipe 431 of this application is arranged along the length of the nitrogen transfer mechanism 42, serving as the main channel for nitrogen delivery. The horizontal pipe 432 is used to connect the vertical pipe 431 to the injection cavity 5, and is arranged vertically in an array along the length of the nitrogen transfer mechanism 42. The open end of each horizontal pipe 432 is connected to the injection cavity 5, ensuring that the nitrogen can be accurately distributed into the injection cavity 5. The nitrogen enters multiple vertical pipes 431 through the nitrogen delivery mechanism 41, and then is blown into the injection cavity 5 from different heights through multiple horizontal pipes 432, ensuring that the nitrogen is evenly distributed to all areas of the injection cavity 5. This application can effectively improve the shrinkage and deformation problems in thick-walled areas during the injection molding process through the layered blowing method, while improving the uniformity and quality of the injection molded products.

[0051] Furthermore, such as Figure 2 As shown, the first injection mold 1 is provided with a plug hole 11 for the nitrogen transfer mechanism 42 to be inserted, and the injection core 3 is provided with a nitrogen inlet groove 12 for connecting the plug hole 11 and the injection cavity 5. The end of the nitrogen transfer mechanism 42 is inserted into the nitrogen inlet groove 12.

[0052] The nitrogen transfer mechanism 42 of this application passes through the insertion hole 11, and the end of the nitrogen transfer mechanism 42 is inserted into the nitrogen inlet groove 12, thereby forming a complete nitrogen delivery channel. Nitrogen can enter the nitrogen inlet groove 12 from the insertion hole 11 through the nitrogen inlet conduit 43 in the nitrogen transfer mechanism 42, and finally enter the injection molding cavity 5. This application realizes the efficient and smooth transmission of nitrogen from the nitrogen transfer mechanism 41 to the injection molding cavity 5, ensuring the uniform distribution of nitrogen in the injection molding process, thereby reducing shrinkage and deformation in thick-walled areas.

[0053] Specifically, such as Figure 3 As shown, the nitrogen temperature regulating mechanism 44 includes a support frame 441 connected to the second injection mold 2, and a cooling component 442 connected to the support frame 441 and located on the upper side of the support frame 441; the cooling component 442 is connected to the nitrogen blowing pipe 43.

[0054] The support frame 441 of this application is connected to the second injection mold 2, providing stable structural support. The cooling component 442 is fixed on the upper side of the support frame 441 and is connected to the nitrogen blowing pipe 43. Before entering the injection cavity 5, the nitrogen is conditioned by the cooling component 442. Through the stable connection of the support frame 441, the cooling component 442 can effectively cool the nitrogen and deliver the temperature-adjusted nitrogen to the injection cavity 5 through the nitrogen blowing pipe 43. By reducing the temperature of the nitrogen, this application can assist in the cooling and molding of the plastic product after injection molding, accelerate the production molding efficiency, and improve the overall quality and precision of the injection molded product.

[0055] The refrigeration component 442 is preferably a refrigerator.

[0056] More specifically, such as Figure 3 As shown, the nitrogen temperature regulating mechanism 44 also includes a heating component 443 connected to the support frame 441 and located on the lower side of the support frame 441; the heating component 443 is connected to the nitrogen inlet conduit 43 to heat the nitrogen in the nitrogen inlet conduit 43.

[0057] The heating component 443 of this application is connected to the support frame 441, located on the lower side of the support frame 441, and communicates with the nitrogen inlet conduit 43. The heating component 443 is used to heat the nitrogen in the nitrogen inlet conduit 43. The heated nitrogen enters the injection cavity 5 through the nitrogen inlet conduit 43 to preheat the injection cavity 5 and the injection material at the beginning of injection molding, thereby improving injection efficiency and quality. This application can also flexibly adjust the temperature of the nitrogen to adapt to the needs of different injection molding processes, ensuring 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.

[0058] The heating component 443 is preferably an electric heater.

[0059] In addition, such as Figure 3 As shown, the second injection mold 2 is also provided with a pulse valve mechanism 6 connected to the nitrogen transfer 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 pipe 43.

[0060] The pulse valve mechanism 6 of this application controls the pulse delivery of nitrogen gas, enabling nitrogen gas to be blown intermittently from the nitrogen gas inlet conduit 43 into the injection molding cavity 5. Through the control of the pulse valve mechanism 6, the amount and time of nitrogen gas delivery can be precisely adjusted, avoiding the negative impact of excessive nitrogen gas 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.

[0061] And, as Figure 3 As shown, the nitrogen delivery mechanism 41 includes a gas pump assembly 411 connected to the nitrogen transfer mechanism 42 and communicating with the nitrogen blowing conduit 43, and a nitrogen generator 412, with the gas pump assembly 411 located between the nitrogen generator 412 and the refrigeration assembly 442.

[0062] In this application, nitrogen is generated by a nitrogen generator 412 and driven by an air pump assembly 411 to blow nitrogen from the nitrogen transfer mechanism 42 into the conduit 43 and deliver it to the injection molding cavity 5. Through the efficient delivery of the air pump assembly 411, this application achieves continuous and stable delivery of nitrogen from generation to the injection molding cavity 5, thereby effectively avoiding shrinkage and deformation problems in thick-walled areas and improving the quality and uniformity of injection molded products.

[0063] The air pump assembly 411 is preferably a high-pressure air pump.

[0064] Furthermore, such as Figure 3 As shown, the second injection mold 2 is also provided with an overflow groove 7 that communicates with the injection cavity 5.

[0065] In the injection molding process, if the injection volume exceeds the volume of the injection cavity 5 when the injection material is injected into the injection cavity 5, the excess injection material will flow into the overflow groove 7, thereby avoiding the overflow or contamination of the injection material and improving the cleanliness of the production. By effectively collecting the overflowed excess material, this application reduces material waste and environmental pollution, while improving the efficiency of the injection molding process and the product qualification rate, ensuring the quality of the final product and the economy of production.

[0066] Furthermore, such as Figure 4 As shown, a nitrogen injection molding method includes a nitrogen injection molding device and further includes the following steps:

[0067] S1: After the second injection mold 2 and the first injection mold 1 are closed, the injection core 3 is inserted into the injection cavity 5;

[0068] S2: The first injection mold 1 injects plastic into the injection cavity 5, and the nitrogen blowing device 4 blows nitrogen into the injection cavity 5;

[0069] S3: Nitrogen temperature regulating mechanism 44 regulates the delivery temperature of nitrogen in nitrogen blowing into the nitrogen inlet conduit 43, so that the delivery temperature of nitrogen gradually increases for injection molding preheating.

[0070] S4: The nitrogen delivery mechanism 41 is used to adjust the nitrogen flow rate and pressure in multiple nitrogen blowing pipes 43 one by one, and to blow nitrogen in layers for injection molded parts of different thicknesses; when the preset thickness of the injection molded part gradually increases, the flow rate and pressure of the nitrogen blown out from the corresponding nitrogen blowing pipe 43 increase accordingly.

[0071] S5: When the first injection mold 1 completes injection into the injection cavity 5, the nitrogen temperature regulating mechanism 44 adjusts the nitrogen delivery temperature in the nitrogen blowing pipe 43 so that the nitrogen delivery temperature gradually decreases to assist in cooling the injection molded workpiece.

[0072] In this application, after the second injection mold 2 and the first injection mold 1 are closed, the injection core 3 is inserted into the injection cavity 5, forming a complete injection space; the first injection mold 1 injects molded material into the injection cavity 5, and simultaneously 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 delivery temperature of nitrogen in the nitrogen blowing conduit 43, so that the delivery temperature of nitrogen gradually increases, thereby preheating the injection molding; the nitrogen delivery mechanism 41 adjusts the nitrogen flow rate and pressure in multiple nitrogen blowing conduits 43 one by one to adapt to injection molded workpieces of different thicknesses. To ensure that nitrogen can be blown in layers, the nitrogen flow rate and pressure gradually increase as the preset thickness of the injection molded workpiece gradually increases. After the first injection mold 1 injects the nitrogen into the injection cavity 5, the nitrogen temperature regulation mechanism 44 adjusts the nitrogen delivery temperature again to gradually reduce the delivery temperature, thereby providing auxiliary cooling for the injection molded workpiece. This application achieves efficient utilization of nitrogen during the injection molding process by regulating the temperature and controlling the flow rate of nitrogen, ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the injection molded workpiece.

[0073] Specifically, step S5 also includes the following steps:

[0074] The nitrogen temperature regulating mechanism 44 adjusts the delivery temperature of nitrogen in multiple nitrogen blowing conduits 43 one by one. When the preset thickness of the injection molded workpiece gradually increases, the delivery temperature of the nitrogen blowing out from the corresponding nitrogen blowing conduit 43 decreases accordingly.

[0075] As the preset thickness of the injection-molded workpiece gradually increases, the nitrogen temperature regulating mechanism 44 correspondingly decreases the delivery temperature of the nitrogen blowing out of the nitrogen blowing conduit 43 to adapt to 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 as follows: This application improves the cooling efficiency of thick-walled injection-molded workpieces by dynamically adjusting the delivery temperature of nitrogen, preventing quality defects caused by excessive temperature, and thus improving the overall performance and consistency of the injection-molded products.

[0076] The implementation principle of the nitrogen injection molding equipment and method in this application embodiment is as follows:

[0077] A nitrogen injection molding device is disclosed, wherein nitrogen is output from a nitrogen delivery mechanism 41, and then transported to a nitrogen temperature regulating mechanism 44 through multiple nitrogen inlet conduits 43 within a nitrogen transfer mechanism 42. The nitrogen temperature regulating mechanism 44 regulates the temperature of the nitrogen and then blows it into the injection molding cavity 5 in layers through multiple nitrogen inlet conduits 43 arranged along the length of the nitrogen transfer mechanism 42. In this application, the nitrogen can enter the injection molding cavity 5 in layers evenly. Especially in the thicker areas of the plastic product, the nitrogen delivery mechanism 41 precisely controls the amount and pressure of nitrogen injected into each layer, making the hollow structure of the plastic product more uniform in the thickness direction. This can effectively alleviate the shrinkage and deformation problems of the plastic product, thereby improving product quality.

[0078] The heating component 443 is connected to the support frame 441, located on the lower side of the support frame 441, and communicates with the nitrogen inlet conduit 43. The heating component 443 is used to heat the nitrogen in the nitrogen inlet conduit 43. The heated nitrogen enters the injection cavity 5 through the nitrogen inlet conduit 43 to preheat the injection cavity 5 and the injection material at the beginning of injection molding, thereby improving injection efficiency and quality. This application can also flexibly adjust the temperature of the nitrogen to adapt to the needs of different injection molding processes, ensuring 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.

[0079] A nitrogen injection molding method includes the following steps: After the second injection mold 2 and the first injection mold 1 are closed, the injection core 3 is inserted into the injection cavity 5 to form a complete injection space; the first injection mold 1 injects molded material into the injection cavity 5, while 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 delivery temperature of nitrogen in the nitrogen blowing conduit 43, gradually increasing the delivery temperature of nitrogen to preheat the injection molding process; and a nitrogen delivery mechanism 41 adjusts the nitrogen flow rate and pressure in multiple nitrogen blowing conduits 43 one by one to adapt to injection molding of different thicknesses. The workpiece is treated to ensure that nitrogen can be blown in layers. As the preset thickness of the injection molded workpiece gradually increases, the corresponding nitrogen flow rate and pressure also gradually increase. After the first injection mold 1 injects the workpiece into the injection cavity 5, the nitrogen temperature regulation mechanism 44 adjusts the nitrogen delivery temperature again to gradually reduce the delivery temperature, thereby providing auxiliary cooling for the injection molded workpiece. This application achieves efficient utilization of nitrogen during the injection molding process by regulating the temperature and controlling the flow rate of nitrogen, ensuring uniform filling of thick-walled areas, reducing shrinkage and deformation problems, and optimizing the overall quality and production efficiency of the injection molded workpiece.

[0080] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A nitrogen injection molding equipment, characterized in that, It includes a first injection mold (1), a second injection mold (2) corresponding to and cooperating with the first injection mold (1), an injection core (3) disposed on the first injection mold (1), and a nitrogen blowing device (4) inserted into 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 the injection core (3) to be inserted. The nitrogen blowing device (4) includes a nitrogen delivery mechanism (41), a nitrogen transfer mechanism (42) inserted into the first injection mold (1), a nitrogen blowing conduit (43) inserted into 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 transfer 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 transfer mechanism (42) along the length direction of the nitrogen transfer mechanism (42), the opening end of the nitrogen blowing conduit (43) is connected to the injection cavity (5), and the opening ends of the plurality of nitrogen blowing conduits (43) are arranged in an array along the length direction of the nitrogen transfer mechanism (42) to blow nitrogen into the injection cavity (5) in layers.

2. The nitrogen injection molding equipment according to claim 1, characterized in that, The nitrogen blowing conduit (43) includes a vertical tube (431) arranged along the length of the nitrogen transfer mechanism (42) and a horizontal tube (432) for connecting the vertical tube (431) and the injection cavity (5). The open ends of the plurality of horizontal tubes (432) are arranged in a vertical array along the length of the nitrogen transfer mechanism (42).

3. The nitrogen injection molding equipment according to claim 1, characterized in that, The second injection mold (2) is provided with a plug hole (11) for the nitrogen transfer mechanism (42) to be inserted, and the injection core (3) is provided with a nitrogen inlet groove (12) for connecting the plug hole (11) and the injection cavity (5). The end of the nitrogen transfer mechanism (42) is inserted into the nitrogen inlet groove (12).

4. The nitrogen injection molding equipment according to claim 1, characterized in that, The nitrogen temperature regulating mechanism (44) includes a support frame (441) connected to the second injection mold (2) and a cooling component (442) connected to the support frame (441) and located on the upper side of the support frame (441); the cooling component (442) is connected to 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 includes a heating component (443) connected to the support frame (441) and located on the lower side of the support frame (441); the heating component (443) is connected to the nitrogen inlet conduit (43) for heating the nitrogen in the nitrogen inlet 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 transfer 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) includes a gas pump assembly (411) connected to the nitrogen transfer mechanism (42) and communicating with the nitrogen blowing duct (43), and a nitrogen generator (412), the gas pump assembly (411) being 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) that communicates with the injection cavity (5).

9. A nitrogen injection molding method, characterized in that, The nitrogen injection molding equipment according to any one of claims 1 to 8 further includes the following steps: S1: When the second injection mold (2) and the first injection mold (1) are closed, the injection core (3) is inserted into the injection cavity (5); S2: The first injection mold (1) injects plastic 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 delivery temperature of nitrogen in the nitrogen blowing into the duct (43) so that the delivery temperature of nitrogen gradually increases to preheat the injection molding process. S4: The nitrogen delivery mechanism (41) is used to adjust the nitrogen flow rate and pressure in the multiple nitrogen blowing inlet conduits (43) one by one, and to blow nitrogen in layers for injection molded workpieces of different thicknesses; 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 inlet conduit (43) increase accordingly. S5: When the first injection mold (1) completes injection molding into the injection cavity (5), the nitrogen temperature adjustment mechanism (44) adjusts the delivery temperature of nitrogen in the nitrogen blowing conduit (43) so that the delivery temperature of nitrogen gradually decreases to assist 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) adjusts the delivery temperature of nitrogen in the nitrogen blowing in the multiple nitrogen blowing in 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 in conduit (43) decreases accordingly.

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