Injection molding mold for producing composite insulator

Abstract

The utility model relates to an injection molding mold for producing a composite insulator. The injection molding mold for producing the composite insulator comprises a plurality of large umbrella mold cavities and a plurality of small umbrella mold cavities, wherein the large umbrella mold cavities and the small umbrella mold cavities are alternately arranged; grooves are formed in the surfaces of mold cavities, used for containing hardware fittings, of the two ends of the mold. A sealing strip is inserted into the groove; and the large umbrella mold cavity and the small umbrella mold cavity are positioned between the two grooves. According to the scheme, gaps in the two ends of the mold can be completely sealed, waste of raw materials is reduced, the situation that composite insulators are lack of materials due to glue overflowing is avoided, the one-time production percent of pass of products can be improved, overflowing glue does not need to be manually taken and cleaned, the workload can be greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of insulator forming molds, and particularly to an injection molding mold for producing composite insulators. Background Art

[0002] An insulator is a device that can withstand voltage and mechanical stress and is installed between conductors at different potentials or between conductors and grounding components. There are many types of insulators with different shapes. Although the structures and outer shapes of different types of insulators vary greatly, they are all composed of two major parts: insulating parts and connecting fittings. An insulator is a special insulating control device that plays an important role in overhead transmission lines. In the early years, insulators were mostly used on utility poles. Gradually, many disc-shaped insulators are hung at one end of the high-voltage wire connection tower. It is used to increase the creepage distance and is usually made of glass or ceramic, which is called an insulator. The insulator should not fail due to various mechanical and electrical stresses caused by changes in environmental and electrical load conditions. Otherwise, the insulator will not play a significant role and will damage the service life of the entire line.

[0003] During the injection process of producing composite insulators, after the fitting and the core rod are crimped by the crimping process and placed in the mold, there will be a certain gap between the surface of the mold cavity and the surface of the fitting after the mold and the fitting are closed. As a result, when the injection molding machine is running, due to the action of the upper and lower pressures, the rubber compound will overflow from the gap, causing waste of the rubber compound and increasing the workload of trimming. Summary of the Utility Model

[0004] To solve or partially solve the problems existing in the related art, this application provides an injection molding mold for producing composite insulators, which can completely seal the gaps at both ends of the mold, reduce waste of raw materials, avoid the situation of material shortage of composite insulators caused by overflowing glue, and can improve the first-pass production qualification rate of products. It does not require manual cleaning of the overflowing glue, which can greatly reduce the workload and improve production efficiency.

[0005] This application provides an injection molding mold for producing composite insulators, including a plurality of large umbrella mold cavities and a plurality of small umbrella mold cavities, and the large umbrella mold cavities and the small umbrella mold cavities are arranged alternately; grooves are opened at the surface of the mold cavity for placing the fitting at both ends of the mold; sealing strips are inserted into the grooves; the large umbrella mold cavities and the small umbrella mold cavities are located between the two grooves.

[0006] In the solution provided by this application, in the mold for producing composite insulators, there can be multiple large umbrella cavities and small umbrella cavities, which are arranged alternately. The sizes of the large umbrella cavities and small umbrella cavities in each mold can be different. Select a suitable production mold according to the size of the composite insulator to be produced, and this can maximize the reduction of glue overflow during the mold closing process.

[0007] In a possible implementation, the end faces at both ends of the sealing strip are flush with the mold surface.

[0008] In the solution provided by this application, it can reduce the outflow of the rubber compound from the gap during the production process, resulting in glue overflow.

[0009] In a possible implementation, the main body of the sealing strip is 0.5 mm to 1 mm higher than the mold surfaces on both sides of the groove.

[0010] In the solution provided by this application, after the upper mold and the lower mold are closed, the sealing strip can fill the gap and prevent the pressure inside the injection molding machine from forcing the rubber compound to overflow during the vulcanization process. The sealing strip can reduce the overflow of the rubber compound.

[0011] In a possible implementation, the bottom size of the groove is larger than the top size of the groove.

[0012] In the solution provided by this application, the bottom size and top size of the groove can be smaller than the size of the small umbrella cavity, and the bottom size and top size of the groove can be smaller than the size of the large umbrella cavity, which can better prevent glue overflow.

[0013] In a possible implementation, the cross-section of the groove is trapezoidal.

[0014] In the solution provided by this application, the shape of the cross-section of the groove matches the cross-section of the sealing strip, which can enable the sealing strip to be better embedded in the groove and reduce the gap when the mold is closed.

[0015] In a possible implementation, the material of the sealing strip is polytetrafluoroethylene.

[0016] In the solution provided by this application, the sealing strip made of polytetrafluoroethylene firmly seals the gap between the fitting or sheath and the mold under the action of the mechanical pressure of the injection molding machine.

[0017] In a possible implementation, the original shape of the sealing strip is a circular strip. After the sealing strip is inserted into the groove, it deforms under the mechanical pressure of the injection machine platform to adapt to the groove.

[0018] In the solution provided by this application, through pressurization and heating, the sealing strip can be completely embedded into the inner part of the groove. When the upper and lower molds are closed, the sealing strip can completely seal the mold closing gaps at both ends, preventing the rubber material from overflowing.

[0019] In one possible implementation, the mold is made of metal.

[0020] In the solution provided by this application, the metal has good heat resistance and corrosion resistance, and can be used for producing composite insulators for a long time.

[0021] In one possible implementation, there are three large umbrella mold cavities and two small umbrella mold cavities. Among them, the two large umbrella mold cavities are respectively arranged at the positions closest to the two grooves.

[0022] In the solution provided by this application, different numbers of large umbrella mold cavities and small umbrella mold cavities can produce composite insulators of different sizes.

[0023] In one possible implementation, the mold further includes: a rubber coating head, which is located between one groove and the large umbrella mold cavity closest to the groove.

[0024] In the solution provided by this application, the rubber coating head can effectively prevent water vapor from infiltrating along the flange and insulator interface through a sealing structure, avoid the aging of the glue caused by the intrusion of water vapor, thereby improving the sealing performance and service life of the insulator.

[0025] The technical solution provided by this application may include the following beneficial effects:

[0026] An injection molding mold for producing composite insulators according to this application includes a plurality of large umbrella mold cavities and a plurality of small umbrella mold cavities, which are arranged alternately; grooves are provided on the surface of the mold cavities at both ends for placing fittings; a sealing strip is inserted into the grooves; the large umbrella mold cavities and the small umbrella mold cavities are located between the two grooves, which can completely seal the gaps at both ends of the mold, reduce the waste of raw materials, avoid the situation of material shortage of the composite insulator caused by overflowing glue, and can improve the one-time production qualification rate of the product. There is no need for manual cleaning of the overflowing glue, which can greatly reduce the workload and improve the production efficiency.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By describing the exemplary embodiments of this application in more detail in conjunction with the drawings, the above and other objects, features and advantages of this application will become more obvious. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0029] Figure 1 It is a schematic structural diagram of an injection molding die for producing composite insulators shown in an embodiment of the present application;

[0030] Figure 2 It is another schematic structural diagram of an injection molding die for producing composite insulators shown in an embodiment of the present application;

[0031] Figure 3 It is another schematic structural diagram of an injection molding die for producing composite insulators shown in an embodiment of the present application.

[0032] Reference numerals: 1, die; 2, large umbrella cavity; 3, small umbrella cavity; 4, groove; 5, sealing strip; 6, rubber coating head. Detailed implementation manners

[0033] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0034] It should be understood that although terms such as "first", "second", and "third" may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0035] In addition, "a plurality" in the embodiments of the present application means two or more. In view of this, "a plurality" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two, or more. For example, including at least one means including one, two, or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then what can be included are A, B, C, A and B, A and C, B and C, or A and B and C.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0037] Unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] Composite insulators are usually produced using an injection molding machine. The injection molding machine heats the silicone rubber electrically to reach the temperature required for vulcanization. During the heating process, the vulcanizing agent and other additives in the silicone rubber material undergo a chemical reaction, causing the bond structure between the silicone rubber molecules to reorganize. The injection molding machine provides pressure through a mechanical device to ensure that the rubber material is under appropriate pressure during the vulcanization process. The role of the pressure is to promote better cross-linking of the silicone rubber molecules, thereby improving the physical and mechanical properties of the silicone rubber products. During the heating and pressurization process of the injection molding machine, the fluidity of the silicone rubber becomes stronger. Therefore, if the two ends of the injection molding machine mold are not sealed, the silicone rubber is likely to overflow during the injection production process, resulting in the silicone rubber overflowing from the machine platform, causing material shortage in the product; the overflowed silicone rubber cannot be recycled, resulting in waste of raw materials, and workers need to clean up the overflowed glue, increasing unnecessary workload.

[0039] In view of the above problems, the embodiment of the present application provides an injection molding mold for producing composite insulators, which can completely seal the gaps at both ends of the mold, reduce waste of raw materials, avoid the situation of material shortage in composite insulators caused by overflowing glue, and can improve the first-pass production qualification rate of products. There is no need for manual cleaning of the overflowed glue, which can greatly reduce the workload and improve production efficiency.

[0040] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0041] Figure 1 It is a schematic structural diagram of an injection molding mold for producing composite insulators shown in the embodiment of the present application.

[0042] See Figures 1 - 3An injection molding mold for producing composite insulators, comprising a plurality of large umbrella mold cavities 2 and a plurality of small umbrella mold cavities 3, wherein the large umbrella mold cavities 2 and the small umbrella mold cavities 3 are arranged alternately, and grooves 4 are opened on the mold cavity surfaces at both ends of the mold 1 for placing metal fittings; a sealing strip 5 is inserted into the groove 4; the large umbrella mold cavities 2 and the small umbrella mold cavities 3 are located between the two grooves 4

[0043] Specifically, insulators are important components used to support and insulate conductors in power systems. They can be made of different materials, such as ceramics, glass, and composite materials. Different types of insulators have their own advantages and disadvantages. Ceramic insulators have good insulation performance, chemical stability, thermal stability, and strong anti-aging ability, but defects may not be easy to find, and need to be inspected piece by piece on the tower, and accidents may be caused by lightning strikes or dirty flashovers. Glass insulators have high mechanical strength and are not prone to cracks. They age slowly and do not require zero-value detection because zero-value glass insulators will explode by themselves, but they are transparent in appearance and internal defects are easy to find. Composite insulators are small in size, light in weight, high in mechanical strength, excellent in seismic resistance, and good in pollution resistance, but their anti-aging ability is not as good as ceramic and glass insulators, and their production cost is high. In overhead transmission lines, the number of insulators is determined according to a specific calculation formula. Usually, one insulator can withstand a voltage of about 15 to 20 kilovolts. For example, a 1,000 kV transmission line may require more than 60 insulators, while a 220 kV line may require 12-14. In addition, in high altitude or heavily polluted areas, the number of insulators may need to be increased to ensure safety. Understandably, composite insulators have excellent performance, but the production cost is high, mainly because a lot of rubber is used in the production process, especially when the mold is closed, which causes the rubber to overflow from the gap, resulting in waste.

[0044] Specifically, in the production of insulators, large sheds and small sheds usually refer to a part of the composite insulator used to increase the creepage distance. It is composed of an anti-pollution flash layer and a special structure. These structures are designed to resist external pollution and improve insulation performance. It can be understood that "small sheds" usually refer to shed structures that are smaller in size than the main sheds, which can improve the insulation performance of insulators in polluted environments. Large sheds can provide a larger surface area, which helps to improve the anti-pollution and creepage performance of the insulator, and the large sheds can have more complex geometric shapes and more obvious contours to increase their surface area and anti-pollution capabilities, while small sheds have certain advantages in reducing the overall weight of the insulator and reducing costs due to their smaller size.

[0045] Specifically, in a composite insulator, large umbrella skirts and small umbrella skirts are generally alternately combined, and the small umbrella skirts are arranged alternately with the large umbrellas. For example, the spacing between adjacent large umbrella skirts can be 83 - 87 mm, the average umbrella protrusion can be 58 - 79 mm, and the spacing between small umbrella skirts can be 80 - 85 mm. By changing the umbrella protrusion and umbrella spacing of the large and small umbrellas, the umbrella skirt structure parameters of the composite post insulator with the optimal DC pollution flashover characteristics can be obtained.

[0046] Specifically, in the mold 1 for producing composite insulators, there can be multiple large umbrella mold cavities 2 and small umbrella mold cavities 3, which are alternately arranged. The sizes of the large umbrella mold cavities 2 and small umbrella mold cavities 3 in each mold 1 can be different. Select a suitable production mold 1 according to the size of the composite insulator to be produced. The large umbrella mold cavity 2 can form a large umbrella skirt structure for the composite insulator, and the small umbrella mold cavity 3 can form a small umbrella skirt structure for the composite insulator, thereby producing durable composite insulators.

[0047] Specifically, the mold 1 for producing composite insulators generally includes an upper mold and a lower mold. The lower mold can be used to place fittings. The upper mold can be closed with the lower mold from top to bottom. Grooves 4 are opened at both ends of the lower mold where the fittings can be placed, and sealing strips 5 are inserted into the grooves 4. The sealing strips 5 can fill the grooves 4 completely. During the process of using the mold to produce composite insulators, when the mold is closed, the sealing strips 5 can seal the gap between the upper mold and the lower mold, reducing the overflow of the rubber material, reducing the waste of raw materials, and avoiding the situation of material shortage of the composite insulator caused by overflowing glue. It can be understood that multiple large umbrella mold cavities 2 and multiple small umbrella mold cavities 3 are located between the two grooves 4, which can maximize the reduction of glue overflow during the mold closing process.

[0048] An injection molding mold for producing composite insulators according to the present application includes multiple large umbrella mold cavities 2 and multiple small umbrella mold cavities 3, which are alternately arranged; grooves 4 are opened on the mold cavity surfaces at both ends of the mold 1 for placing fittings; sealing strips 5 are inserted into the grooves 4; the large umbrella mold cavities 2 and the small umbrella mold cavities 3 are located between the two grooves 4, which can completely seal the gaps at both ends of the mold 1, reduce the waste of raw materials, avoid the situation of material shortage of the composite insulator caused by overflowing glue, and can improve the first - pass production qualification rate of the product. There is no need for manual cleaning of the overflowing glue, which can greatly reduce the workload and improve the production efficiency.

[0049] In a possible implementation manner, the end faces at both ends of the sealing strip 5 are flush with the surface of the mold 1.

[0050] Specifically, after the sealing strip 5 is inserted into the groove 4, the end faces at both ends of the sealing strip 5 can be flush with the surface of the mold 1, which can minimize the gap when the upper mold and the lower mold are closed. If the height of both ends is too high after the sealing strip 5 is inserted into the groove 4, it will cause too large a gap when the upper mold and the lower mold are closed, which will cause the rubber compound to flow out from the gap during the production process, resulting in rubber overflow. Therefore, both ends of the sealing strip 5 need to be flush with the surface of the mold 1. Further, after the sealing strip 5 is inserted into the groove 4, it can be checked whether the sealing strip 5 is completely inserted into the groove 4, which can prevent the sealing strip 5 from not being completely inserted into the groove 4, resulting in a gap still existing between the molds during the production process and the rubber compound overflowing from the mold.

[0051] In a possible implementation, the main body of the sealing strip 5 is 0.5 mm to 1 mm higher than the mold surfaces on both sides of the groove 4.

[0052] Specifically, after the sealing strip 5 is inserted into the groove 4, the main body of the sealing strip 5 can be higher than the surfaces on both sides of the groove 4, for example, 0.5 mm - 1 mm, which is not limited here. The main body of the sealing strip 5 being higher than the surfaces on both sides of the groove 4, after the upper mold and the lower mold are closed, the sealing strip 5 will firmly seal the gap between the fitting or the sheath and the mold under the action of the mechanical pressure of the injection molding machine. The sealing strip 5 can fill the gap and prevent the rubber compound from overflowing due to the pressure inside the injection molding machine during the vulcanization process. The sealing strip 5 can reduce the overflow of the rubber compound.

[0053] In a possible implementation, the bottom dimension of the groove 4 is larger than the top dimension of the groove 4.

[0054] Specifically, the bottom dimension of the groove 4 at both ends of the mold is larger than the top dimension of the groove 4, which can better accommodate the sealing strip 5, so that after the sealing strip 5 is inserted into the groove 4, it can be well placed in the groove 4, and the gap between the fitting or the sheath and the mold can be firmly sealed under the action of the mechanical pressure of the injection molding machine. It can be understood that the bottom dimension and the top dimension of the groove 4 can be smaller than the dimension of the small umbrella cavity 3, and the bottom dimension and the top dimension of the groove 4 can be smaller than the dimension of the large umbrella cavity 2, which can better prevent rubber overflow.

[0055] In a possible implementation, the cross-section of the groove 4 is trapezoidal.

[0056] Specifically, the cross-section of the groove 4 can be trapezoidal. Correspondingly, the cross-section of the sealing strip 5 can also be trapezoidal. The shape of the cross-section of the groove 4 matches the cross-section of the sealing strip 5, which can enable the sealing strip 5 to be better embedded in the groove 4 and reduce the gap when the mold is closed. It can be understood that the width of the cross-section of the groove 4 can be smaller than the width of the small umbrella cavity 3.

[0057] In a possible implementation, the material of the sealing strip 5 is polytetrafluoroethylene.

[0058] Specifically, the material of the sealing strip 5 can be a high polymer, such as polytetrafluoroethylene. Polytetrafluoroethylene (PTFE), also known as Teflon or Teflon, is a material with excellent insulation properties obtained by polymerizing tetrafluoroethylene as a monomer. It is a high molecular material with extremely high corrosion resistance and high temperature resistance, and can be used for a long time in an environment of -180°C to 260°C. It can be well applied in the manufacture of insulators, making PTFE insulators have properties such as low loss, high electric breakdown strength, excellent dielectric properties, and good chemical stability.

[0059] Specifically, after the sealing strip 5 is placed in the groove 4 and the mold is closed, the sealing strip 5 made of polytetrafluoroethylene firmly seals the gap between the fitting or sheath and the mold under the action of the mechanical pressure of the injection molding machine.

[0060] In a possible implementation, the original shape of the sealing strip 5 is a circular strip. After the sealing strip 5 is inserted into the groove 4, it deforms under the mechanical pressure of the injection machine table to fit the groove 4.

[0061] Specifically, the sealing strip 5 can be a circular strip. When the sealing strip 5 is inserted into the groove 4, it can be completely embedded in the groove 4 by applying pressure and heat. After the upper and lower molds are closed, the sealing strip 5 can completely seal the mold gap at both ends to prevent the rubber material from overflowing.

[0062] In a possible implementation, the mold 1 is made of metal.

[0063] Specifically, the upper mold and the lower mold for producing composite insulators can both be made of metal, such as materials like iron and steel. Metal has good heat resistance and corrosion resistance and can be used for a long time in the production of composite insulators.

[0064] In a possible implementation, there are three large umbrella cavities 2 and two small umbrella cavities 3. Among them, the two large umbrella cavities 2 are respectively arranged at the positions closest to the two grooves 4.

[0065] Specifically, there are three large umbrella cavities 2 and two small umbrella cavities 3. The large umbrella cavities 2 and the small umbrella cavities 3 can be alternately arranged on the mold, and a composite insulator can be obtained through the manufacturing process.

[0066] In a possible implementation, the mold further includes: a rubber coating head 6, and the rubber coating head 6 is located between a groove 4 and the large umbrella cavity 2 closest to the groove 4.

[0067] Specifically, a rubber encapsulation head 6 is also provided in the mold. At the end position of the composite insulator, a rubber encapsulation head 6 can be formed in the form of rubber encapsulation. The rubber encapsulation head 6 effectively prevents water vapor from infiltrating along the interface between the flange and the insulator through a sealing structure, avoiding the aging of the adhesive due to the intrusion of water vapor, thereby improving the sealing performance and service life of the insulator. The rubber encapsulation head 6 is usually made of materials such as silicone rubber and has good electrical insulation performance to ensure the electrical safety of the insulator. Specifically, the rubber encapsulation head 6 is located between a groove 4 and the large umbrella mold cavity 2 closest to the groove 4.

[0068] Working principle: Before producing the composite insulator, the sealing strip 5 can be inserted into the grooves 4 at both ends of the mold 1. When it is necessary to produce the composite insulator, the upper mold and the lower mold are closed. Under the action of the mechanical pressure of the injection molding machine, the sealing strip 5 firmly seals the gap between the fitting or the sheath and the mold, preventing the overflow of the rubber material during the production process. After the production is completed, the upper mold and the lower mold can be separated, and the state of the sealing strip 5 in the grooves 4 at both ends can be checked. If the sealing strip 5 is not in the best state, such as overheating and melting, the operator can take out the sealing strip 5 inside the groove 4 and replace it with a new sealing strip 5 into the groove 4 for use in the next production of the composite insulator. This can reduce the situation of glue overflow during each production.

[0069] An injection molding mold for producing composite insulators according to the present application includes a plurality of large umbrella mold cavities 2 and a plurality of small umbrella mold cavities 3, and the large umbrella mold cavities 2 and the small umbrella mold cavities 3 are arranged alternately; grooves 4 are opened on the surface of the mold cavities for placing fittings at both ends of the mold 1; a sealing strip 5 is inserted into the grooves 4; the large umbrella mold cavities 2 and the small umbrella mold cavities 3 are located between two grooves 4, which can completely seal the gaps at both ends of the mold, reduce the waste of raw materials, avoid the situation of material shortage of the composite insulator caused by glue overflow, and can improve the qualified rate of the product in one production. There is no need for manual cleaning of the overflowing glue, which can greatly reduce the workload and improve the production efficiency.

[0070] The solution of the present application has been described in detail with reference to the accompanying drawings above. In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also know that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0071] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An injection molding die for producing composite insulators, characterized in that: include: A plurality of large umbrella mold cavities and a plurality of small umbrella mold cavities, wherein the large umbrella mold cavities and the small umbrella mold cavities are arranged alternately; Grooves are provided on the surface of the mold cavity at both ends of the mold for placing hardware; A sealing strip is inserted into the groove; The large umbrella mold cavity and the small umbrella mold cavity are located between the two grooves.

2. The mold according to claim 1, characterized in that: The end surfaces at both ends of the sealing strip are flush with the mold surface.

3. The mold according to claim 2, characterized in that: The main body of the sealing strip is 0.5 mm to 1 mm higher than the mold surface on both sides of the groove.

4. The mold according to claim 1, characterized in that: The bottom dimension of the groove is larger than the top dimension of the groove.

5. The mold according to claim 4, characterized in that: The cross section of the groove is trapezoidal.

6. The mold according to any one of claims 1 to 4, characterized in that: The material of the sealing strip is polytetrafluoroethylene.

7. The mold according to claim 1, characterized in that: The original shape of the sealing strip is a circular strip. After being inserted into the groove, the sealing strip is deformed under the mechanical pressure of the injection molding machine to fit the groove.

8. The mold according to claim 1, characterized in that: The mold is made of metal.

9. The mold according to claim 1, characterized in that: There are three large umbrella mold cavities and two small umbrella mold cavities, wherein the two large umbrella mold cavities are respectively arranged at the positions closest to the two grooves.

10. The mold according to claim 9, characterized in that: The mold further comprises: a rubber encapsulating head, wherein the rubber encapsulating head is located between one of the grooves and a large umbrella mold cavity closest to the groove.

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