Light emitting diode and manufacturing method thereof, and display device

Abstract

The application discloses a lightning protection insulating cylinder manufacturing method and equipment. The method comprises the following steps: first, a first sealing cover assembly and a second sealing cover assembly are respectively and correspondingly arranged on both ends of a cylinder body, wherein a gas hole is arranged on the first sealing cover assembly; then, an inflation device is connected with the gas hole, and the cylinder body is inflated to form an inflated cylinder body; then, an injection machine is connected with a skirt mold, and a skirt injection material is injected into the inflated cylinder body in the skirt mold at a first preset pressure to form a skirt structure on the outside of the inflated cylinder body; and then, the skirt mold and the sealing cover assembly are sequentially disassembled. The method can avoid the problem of cylinder body burst caused by excessive injection pressure of the injection machine, and can improve the production efficiency of the lightning protection insulating cylinder and avoid the risk of scratching the inner wall of the cylinder body.

Description

Manufacturing method and equipment for lightning protection insulating cylinder Technical Field

[0001] This invention relates to the field of lightning protection for power systems, specifically to a method and equipment for manufacturing lightning protection insulating cylinders. Background Technology

[0002] In the power grid system, there are numerous transmission lines of various voltage levels, distributed in a crisscrossing network. Lightning strikes are one of the main causes of transmission line tripping. In recent years, line surge arresters and lightning protection insulators have begun to be widely used for lightning protection of transmission lines. To reduce weight and facilitate installation, line surge arresters and lightning protection insulators usually adopt composite outer epoxy resin insulating cylinders. Existing high-voltage line surge arresters and surge-protected insulators, such as 110-500kV line surge arresters, use epoxy resin insulating cylinders with silicone rubber sheds encapsulated with resistive elements. The surface sheds are typically manufactured in two ways: one method involves directly placing the epoxy resin cylinder into a shed mold, then using an injection molding machine to inject high-temperature silicone rubber into the mold under high pressure for vulcanization. However, due to the extremely high injection pressure and the limited compressive and shear strength of the epoxy resin cylinder wall, even relatively thick epoxy resin cylinders frequently experience tube bursting damage during the high-pressure silicone rubber injection process. The other method involves installing a support mold inside the epoxy resin cylinder before placing it into the shed mold, providing support against the cylinder wall to prevent tube bursting. However, the support mold is difficult and costly to manufacture; different diameter insulating cylinders require different support molds. Furthermore, the support mold is heavy, making installation and removal very difficult, especially for insulating cylinders longer than 1 meter. Installation and removal are time-consuming, inefficient, and costly, and damage to the support mold and the inner wall of the insulating cylinder is also highly likely. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies, the present invention provides a method and equipment for manufacturing lightning protection insulating cylinders, aiming to solve the technical problem that existing lightning protection insulating cylinder manufacturing methods are prone to damage to the inner wall of the insulating cylinder.

[0004] To achieve the above objectives, the present invention provides a method for manufacturing a lightning protection insulating cylinder. The lightning protection insulating cylinder includes a cylinder body and a skirt structure disposed on the outside of the cylinder body. The method for manufacturing the lightning protection insulating cylinder includes:

[0005] Install a first sealing cap assembly and a second sealing cap assembly at both ends of the cylinder, wherein the first sealing cap assembly has an openable and closable air hole.

[0006] Connect the inflation device to the air hole and inflate the cylinder to form an inflatable cylinder;

[0007] The injection machine is connected to the umbrella skirt mold and the umbrella skirt injection material is injected into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure to form an umbrella skirt structure on the outside of the inflatable cylinder. The umbrella skirt injection material is silicone rubber.

[0008] The umbrella skirt mold, the first sealing cover assembly, and the second sealing cover assembly are disassembled in sequence to obtain the lightning protection insulating cylinder.

[0009] In this embodiment of the invention, the pressure inside the air cylinder is set to a second preset pressure, which satisfies the following:

[0010] P2>P1-P Max ;

[0011] In the formula, P1 represents the first preset pressure: the maximum pressure generated on the surface of the inflatable cylinder by the injection molding material of the umbrella skirt into the umbrella skirt mold, and P2 represents the second preset pressure. Max This indicates the maximum pressure that the cylinder can withstand.

[0012] In this embodiment of the invention, gas is first introduced into the cylinder to achieve a second preset pressure. The inflatable cylinder is then placed into the umbrella skirt mold, and the umbrella skirt mold is electrically heated to between 125°C and 135°C. Next, the injection molding machine is connected to the umbrella skirt mold, and the umbrella skirt injection molding material is injected into the surface of the inflatable cylinder placed within the umbrella skirt mold at a first preset pressure. The injection material is typically silicone rubber. The process of injecting the umbrella skirt injection molding material also includes:

[0013] Detect the real-time pressure inside the umbrella skirt mold;

[0014] Calculate the real-time pressure difference between the real-time pressure and the second preset pressure;

[0015] When the real-time pressure in the umbrella skirt mold is close to the first preset pressure, or the real-time pressure difference reaches the preset safety threshold, the injection pressure of the umbrella skirt injection molding material is stopped or slightly reduced, wherein the preset safety threshold is less than or equal to the maximum bearing pressure of the cylinder.

[0016] In this embodiment of the invention, the first preset pressure is between 10 and 12 standard atmospheres, and the second preset pressure is between 1.5 and 2 standard atmospheres.

[0017] In this embodiment of the invention, both the first sealing cap assembly and the second sealing cap assembly include a metal ring and a sealing cap. Installing the first sealing cap assembly and the second sealing cap assembly onto both ends of the cylinder respectively includes:

[0018] External threads are machined at both ends of the cylinder and sealant is applied to the external threads to form the ends of the insulating cylinder;

[0019] Install a metal ring at the end of the insulating cylinder;

[0020] The cylinder body is polished, cleaned, and dried;

[0021] Seal the sealing cap with the metal ring.

[0022] In this embodiment of the invention, docking the injection molding machine with the umbrella skirt mold and injecting umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure to form an umbrella skirt structure on the outside of the inflatable cylinder includes:

[0023] Place the inflatable cylinder inside the umbrella skirt mold;

[0024] Heat the umbrella skirt mold to between 125℃ and 135℃;

[0025] The umbrella skirt injection molding material and vulcanizing agent are injected into the surface of the air cylinder in the umbrella skirt mold at a first preset pressure to form the umbrella skirt structure through vulcanization.

[0026] To achieve the above objectives, the present invention also provides a lightning protection insulating cylinder manufacturing equipment. The lightning protection insulating cylinder manufacturing equipment is used to implement the above-mentioned lightning protection insulating cylinder manufacturing method. The lightning protection insulating cylinder manufacturing equipment includes a first sealing cap assembly, a second sealing cap assembly, a skirt mold, an inflation device, and an injection machine. The first sealing cap assembly and the second sealing cap assembly are sealed and connected to the two ends of the cylinder body one-to-one. The first sealing cap assembly is provided with an openable and closable air hole, which communicates with the inner cavity provided in the cylinder body. Gas can be injected into or released from the cylinder body through the air hole. The skirt mold forms a mold cavity for accommodating the cylinder body. The inflation device is used to inflate the cylinder body with gas through the air hole. The injection machine is used to extrude the skirt raw material into the mold cavity.

[0027] In this embodiment of the invention, both the first sealing cap assembly and the second sealing cap assembly include a metal ring, a sealing ring, and a sealing cap. The metal ring is sleeved on the end of the cylinder, and a sealing adhesive layer is provided between the metal ring and the cylinder. The sealing cap is used to press the sealing ring against the end face of the metal ring, and the sealing cap of the first sealing assembly is also provided with an air hole.

[0028] In this embodiment of the invention, the umbrella skirt mold is made of stainless steel and has a cylindrical cavity inside for installing the cylinder. The inner wall of the umbrella skirt mold has an umbrella skirt groove, and the stainless steel body of the umbrella skirt mold is also provided with a resistance wire for electric heating. The umbrella skirt mold is usually processed and manufactured by a mold factory.

[0029] In this embodiment of the invention, the first sealing assembly further includes an air inlet pipe connected to the air hole, and an air pressure sensor and an air pressure valve are provided on the air inlet pipe.

[0030] Through the above technical solution, the lightning protection insulating cylinder manufacturing method provided by the embodiments of the present invention has the following beneficial effects:

[0031] The lightning protection insulating cylinder mainly includes a cylinder body and a skirt structure located on the outside of the cylinder body. Using the above-mentioned manufacturing method, a first sealing cap assembly and a second sealing cap assembly are first installed at each end of the cylinder body, respectively. The first sealing cap assembly has an openable and closable air hole. Then, an inflation device is connected to the air hole to inflate the cylinder body, forming an inflatable cylinder body. Next, an injection molding machine is connected to the skirt mold and injects skirt injection molding material into the inflatable cylinder body placed in the skirt mold at a first preset pressure, thereby injecting the skirt material onto the outside of the inflatable cylinder body. By molding the umbrella skirt structure, the gas inside the inflation cylinder exerts an outward pressure on the cylinder wall, which partially or completely offsets the pressure exerted on the cylinder wall by the injection molding material injected into the umbrella skirt. This avoids cylinder bursting due to excessive injection pressure. Furthermore, after the umbrella skirt structure is formed, operators can disassemble the umbrella skirt mold and sealing cap assembly in sequence, allowing the pressure inside the cylinder to return to atmospheric pressure. Compared to existing technologies, this method is more efficient and eliminates the risk of scratching the inner wall of the cylinder.

[0032] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0033] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 is a flowchart of a method for manufacturing a lightning protection insulating cylinder according to an embodiment of the present invention;

[0035] Figure 2 is a detailed flowchart of step S100 in Figure 1;

[0036] Figure 3 is a schematic diagram of the sealing assembly of a lightning protection insulating cylinder according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 1 cylindrical body 2 umbrella skirt structure

[0039] 3 Metal Ring 31 Internal Thread Section

[0040] 32 External thread section 33 Stepped surface Detailed Implementation

[0041] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0042] The method and equipment for manufacturing lightning protection insulating cylinders of the present invention are described below with reference to the accompanying drawings.

[0043] As shown in Figure 1, the present invention provides a method for manufacturing a lightning protection insulating cylinder, wherein the method for manufacturing a lightning protection insulating cylinder includes:

[0044] Step S100: Install the first sealing cover assembly and the second sealing cover assembly at both ends of the cylinder 1 respectively, wherein the first sealing cover assembly has an openable and closable air hole.

[0045] Specifically, the lightning protection insulating cylinder includes a cylinder body 1 and an umbrella skirt structure 2 located on the outside of the cylinder body 1. The cylinder body 1 forms a cavity for accommodating multiple resistor elements in sequence. The first sealing cover assembly and the second sealing cover assembly are sealed to both ends of the cylinder body 1 through a detachable structure. The end of the first sealing cover assembly is provided with an openable and closable air hole, while the end of the second sealing cover assembly is completely sealed.

[0046] Furthermore, regarding the opening and closing structure of the vent, in some embodiments of this application, a rubber pad can be provided on the inner end face of the first sealing cap assembly, and the inflation device is provided with an inflation needle. The inflation needle can expand the rubber pad from the vent inward to allow gas to be injected into the cylinder 1. After the inflation needle is pulled out, the rubber pad presses against the inner end face of the sealing cap assembly under the action of air pressure to close the vent. In some embodiments of this application, the opening and closing structure of the vent can also be achieved by an external air pressure valve.

[0047] Step S200: Connect the inflation device to the air hole and inflate the cylinder 1 to form an inflatable cylinder.

[0048] Step S300: Connect the injection machine to the umbrella skirt mold and inject umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure to form umbrella skirt structure 2 by injection molding on the outside of the inflatable cylinder.

[0049] Specifically, the injection molding machine injects liquid umbrella skirt injection molding material (usually silicone rubber) into the umbrella skirt mold. The umbrella skirt injection molding material adheres to the outer surface of the inflatable cylinder and forms the umbrella skirt structure 2 after cooling and solidification.

[0050] Further, referring to Figure 3, the umbrella skirt structure 2 includes multiple umbrella skirt groups connected sequentially along the axial direction of the cylinder 1. Each umbrella skirt group includes a first umbrella skirt, a second umbrella skirt, and a third umbrella skirt arranged in an alternating manner. The diameters d1, d2, and d3 of the first umbrella skirt satisfy the following condition: d3 > d1 > d2.

[0051] In step S400, the umbrella skirt mold and the sealing cover assembly are disassembled in sequence to obtain the lightning protection insulating cylinder.

[0052] The lightning protection insulating cylinder mainly includes a cylinder body 1 and a skirt structure 2 located on the outside of the cylinder body 1. Using the above-described manufacturing method, a first sealing cap assembly and a second sealing cap assembly are first installed at each end of the cylinder body 1, respectively. The first sealing cap assembly has an openable and closable air hole. Then, an inflation device is connected to the air hole to inflate the cylinder body 1, forming an inflatable cylinder. Next, an injection molding machine is connected to the skirt mold and injects skirt injection molding material into the inflatable cylinder placed in the skirt mold at a first preset pressure, thereby injecting the skirt material onto the outside of the inflatable cylinder. When the umbrella skirt structure 2 is formed, the gas inside the inflation cylinder exerts an outward pressure on the cylinder wall, which partially or completely offsets the pressure exerted on the cylinder wall by the injection molding material of the umbrella skirt. This avoids the phenomenon of cylinder 1 bursting due to excessive injection pressure. Furthermore, after the umbrella skirt structure 2 is formed by injection molding, the operator can disassemble the umbrella skirt mold and sealing cap assembly in sequence, so that the pressure inside the cylinder 1 can be restored to the external atmospheric pressure. Compared with the existing technical solution, it is more efficient and there is no risk of scratching the inner wall of the cylinder 1.

[0053] In this embodiment of the invention, the pressure inside the air cylinder is set to a second preset pressure, which satisfies the following:

[0054] P2>P1-P Max ;

[0055] In the formula, P1 represents the first preset pressure: the maximum pressure exerted on the surface of the inflatable cylinder by the injection molding material of the umbrella skirt into the umbrella skirt mold; P2 represents the second preset pressure; P Max This indicates the maximum pressure that cylinder 1 can withstand.

[0056] By setting a second preset pressure, it is ensured that the pressure difference between the inside and outside of the inflatable cylinder is always less than or equal to the maximum pressure that cylinder 1 can withstand during the fabrication of the umbrella skirt structure, thus preventing the cylinder from bursting. Specifically, a pressure sensor can be installed in the air path from the inflation device to cylinder 1 to assist the operator in controlling the amount of gas injected into cylinder 1.

[0057] In this embodiment of the invention, after docking the injection machine with the umbrella skirt mold and injecting the umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure, the method further includes:

[0058] Detect the real-time pressure inside the umbrella skirt mold;

[0059] Calculate the real-time pressure difference between the real-time pressure and the second preset pressure;

[0060] When the real-time pressure difference reaches the preset safety threshold, the magnitude of the second preset pressure is adjusted, wherein the preset safety threshold is less than or equal to the maximum pressure that the cylinder 1 can withstand.

[0061] By using the above method, the pressure difference inside and outside the cylinder 1 can be adjusted in real time to prevent the cylinder 1 from bursting under a large injection pressure. It is understandable that the second preset pressure must satisfy P2 > P1 - P Max In addition, it is also necessary to satisfy P2 < P Max To prevent tube bursting during inflation, the injection molding machine typically injects raw materials into the skirt at a pressure between 10 and 12 atmospheres. The maximum pressure that the cylinder 1 can withstand is generally around 10 atmospheres. The second preset pressure of the gas pre-filled into the cylinder 1 only needs to reach 1 to 2 atmospheres; this will not cause tube bursting. However, if the first preset pressure of the injection molding machine injecting raw materials into the skirt is much higher than the maximum pressure that the cylinder 1 can withstand, the second preset pressure of the gas filled by the inflation device will also exceed the maximum pressure that the cylinder 1 can withstand. Therefore, by using the above method, the injection molding machine and the inflation device can work simultaneously to synchronously increase or decrease the pressure inside and outside the cylinder 1, ensuring that the pressure difference between the inside and outside of the cylinder 1 is always less than the maximum pressure that the cylinder 1 can withstand. Furthermore, setting a preset safety threshold can further prevent tube bursting. Accordingly, a pressure sensor needs to be installed inside the umbrella skirt mold; the sealing cap needs to extend out of the umbrella skirt mold, or a channel for the inflation device to be inserted is opened on the umbrella skirt mold.

[0062] In this embodiment of the invention, the first preset pressure is between 10 and 12 standard atmospheres, and the second preset pressure is between 1.5 and 2 standard atmospheres.

[0063] As shown in Figure 2, in this embodiment of the invention, both the first sealing cap assembly and the second sealing cap assembly include a metal ring 3 and a sealing cap. Step S100, which involves installing the first sealing cap assembly and the second sealing cap assembly on both ends of the cylinder 1 respectively, includes:

[0064] Step S110: External threads are machined at both ends of the cylinder 1 and sealant is applied to the external threads to form the end of the insulating cylinder;

[0065] Specifically, the cylinder body 1 and the sealant are made of the same insulating material to ensure the consistency of the overall performance of the cylinder body 1. Preferably, the cylinder body 1 is made of glass fiber epoxy resin, and the sealant is an adhesive epoxy resin adhesive.

[0066] Step S120: Install a metal ring 3 at the end of the insulating cylinder;

[0067] Specifically, the metal ring 3 is made of stainless steel tubing. First, a cutting machine is used to cut two metal rings 3, each 5cm to 10cm high, from the stainless steel tubing. Then, a thread milling machine is used to mill threads onto the inner and outer surfaces of the metal rings 3, forming end metal rings 3 with internal and external thread structures. The metal rings 3 are threadedly connected to the cylinder 1, and sealant is applied between them to improve the sealing effect and prevent gas leakage from the cylinder 1 under high pressure. The external thread of the metal ring 3 can also serve as a connecting structure in the subsequent installation process of the lightning protection insulation cylinder, allowing for quick assembly and disassembly of the lightning protection insulation cylinder.

[0068] Step S130: Grind, clean and dry the cylinder 1;

[0069] Grinding and cleaning remove burrs and excess sealant from the surface of cylinder 1, resulting in a smooth surface and improving the reliability of the umbrella skirt structure 2 adhering to cylinder 1. Drying removes moisture, facilitating the adhesion of the umbrella skirt injection molding material to cylinder 1, and ensures complete curing of the sealant, preventing gaps between cylinder 1 and metal ring 3 and guaranteeing a good seal under high temperature and pressure. Specifically, the drying temperature is 105℃~110℃, and the drying time is 0.5h~1h.

[0070] Step S140: Seal the sealing cap with the metal ring 3.

[0071] The sealing cap assembly adopts a split design, with the metal ring 3 and the cylinder 1 connected as one unit. The sealing cap and the metal ring 3 are detachably connected, facilitating the placement of the resistor element into the cylinder 1 after the umbrella skirt structure 2 has cured. Specifically, a sealing ring is also provided between the sealing cap and the metal ring 3. The metal ring 3 can serve as a connection in the subsequent installation process of the lightning protection insulating cylinder without disassembly, so the seal between the metal ring 3 and the cylinder 1 is achieved directly through sealant. The sealing cap, on the other hand, needs to be disassembled and reused. Therefore, the sealing ring is used to achieve the seal between the metal ring 3 and the sealing cap, ensuring the sealing effect without affecting subsequent disassembly.

[0072] In this embodiment of the invention, step S300, which involves docking the injection molding machine with the umbrella skirt mold and injecting umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure, to form the umbrella skirt structure 2 by injection molding on the outside of the inflatable cylinder, includes:

[0073] Place the inflatable cylinder inside the umbrella skirt mold;

[0074] Heat the umbrella skirt mold to between 125℃ and 135℃;

[0075] The umbrella skirt injection molding material and vulcanizing agent are injected into the surface of the air cylinder in the umbrella skirt mold at a first preset pressure to form the umbrella skirt structure 2 by vulcanization.

[0076] Specifically, the injection molding material for the umbrella skirt is silicone rubber. Under high temperature conditions, silicone rubber reacts with a vulcanizing agent to generate vulcanized rubber. Vulcanized rubber has excellent properties such as high strength, high elasticity, high wear resistance, and corrosion resistance. The umbrella skirt structure 2 made of vulcanized rubber is more suitable for harsh outdoor environments.

[0077] In a specific embodiment of the present invention, the method for manufacturing the lightning protection insulating cylinder is as follows:

[0078] First, two metal rings 3 with a height of H (5cm to 10cm can be used according to the general length of the lightning protection insulation cylinder) are cut from a metal tube. Then, the inner and outer surfaces of the metal rings 3 are washed into threads to form end metal rings 3 with internal and external threads.

[0079] Then, external threads corresponding to the internal threads of the end metal rings 3 are machined at both ends of the epoxy resin cylinder. After applying adhesive epoxy resin to the external threads of the epoxy resin end, the two metal rings 3 are installed at both ends of the epoxy resin cylinder respectively. After the adhesive epoxy resin is cured, the cylinder body 1 of the lightning protection insulating cylinder is made.

[0080] Then, after grinding and cleaning the outer surface of the cylinder 1, it is placed in an oven and dried at 110℃ for 30 minutes. Then, the sealing ring is placed on the end of the epoxy resin cylinder inside the metal ring 3. After the sealing cap is used to press and seal the insulating cylinder 1, dry air is filled into the insulating cylinder through the air hole on the sealing cap to ensure that the insulating cylinder has 1 to 2 standard atmospheres of pressure. Since epoxy resin materials usually have a compressive and shear resistance of 10 standard atmospheres, the internal pressure of 1 to 2 standard atmospheres will not affect the structure of the epoxy resin.

[0081] Then, the cylinder 1 is placed into the mold cavity of the silicone rubber umbrella skirt mold. When the mold is heated to 135°C, silicone rubber and vulcanizing agent are injected into the mold cavity of the umbrella skirt mold through an injection molding machine at 11 standard atmospheres. After the silicone rubber is vulcanized and extruded in the mold cavity at high temperature, it adheres to the surface of the cylinder 1 to form an umbrella skirt. The insulating cylinder with the umbrella skirt is taken out of the mold, and the sealing caps and sealing rings at both ends are removed to make a complete lightning protection insulating cylinder.

[0082] The lightning protection insulating sleeve has end metal rings 3 for connection, providing easy assembly and excellent sealing structure. Before the silicone rubber is vulcanized at high temperature, the insulating sleeve is filled with a certain amount of compressed dry air, which reduces the impact of silicone rubber injection pressure on the insulating sleeve, effectively preventing epoxy resin sleeve bursting or cracking, and improving the manufacturing efficiency and product qualification rate of lightning protection insulating sleeves.

[0083] To achieve the above objectives, the present invention also provides a lightning protection insulating cylinder manufacturing equipment. The lightning protection insulating cylinder manufacturing equipment is used to implement the above-mentioned lightning protection insulating cylinder manufacturing method. The lightning protection insulating cylinder manufacturing equipment includes a first sealing cap assembly, a second sealing cap assembly, a skirt mold, an inflation device, and an injection machine. The first sealing cap assembly and the second sealing cap assembly are sealed and connected to the two ends of the cylinder 1 in a one-to-one correspondence. The first sealing cap assembly is provided with an openable and closable air hole, which communicates with the inner cavity provided in the cylinder 1. Gas can be injected into the cylinder 1 or released from the cylinder 1 through the air hole. The skirt mold forms a mold cavity for accommodating the cylinder 1. The inflation device inflates gas into the cylinder 1 through the air hole. The injection machine is used to extrude the skirt raw material into the mold cavity.

[0084] In this embodiment of the invention, both the first sealing cap assembly and the second sealing cap assembly include a metal ring 3, a sealing ring, and a sealing cap. The metal ring 3 is sleeved on the end of the cylinder 1, and a sealing adhesive layer is provided between the metal ring 3 and the cylinder 1. The sealing cap is used to press the sealing ring tightly onto the end face of the metal ring 3, and the sealing cap of the first sealing assembly is also provided with an air hole.

[0085] Specifically, referring to Figure 3, the inner and outer sides of the metal ring 3 are respectively formed with an internal thread section 31 and an external thread section 32. The internal thread section 31 is used for threaded connection with the cylinder 1, and the external thread section 32 is used for threaded connection with the sealing cap. By screwing the metal ring 3 or the sealing cap, the positions of the two can be adjusted so that the length of the cylinder 1 after being connected with the sealing cap assembly can be just accommodated in the mold cavity, reducing the requirements for manufacturing precision and saving costs.

[0086] Furthermore, a stepped surface 33 facing another sealing component is formed on the metal ring 3, and a sealing part abutting against the stepped surface 33 is formed on the umbrella skirt mold. The external thread section 32 is located on the side of the stepped surface 33 away from the sealing part. By cooperating with the sealing part and the stepped surface 33, the umbrella skirt injection molding material can be prevented from overflowing to the connection position between the metal ring 3 and the sealing cover under high pressure, which facilitates the subsequent disassembly of the sealing cover.

[0087] In this embodiment of the invention, the umbrella skirt mold is made of stainless steel and has a cylindrical cavity inside. The cylindrical cavity is used to install the cylinder 1. The inner wall of the umbrella skirt mold has an umbrella skirt groove. The stainless steel body of the umbrella skirt mold is also provided with a resistance wire for electric heating.

[0088] In this embodiment of the invention, both ends of the umbrella skirt mold have openings connecting the mold cavity to the outside. The sealing cover includes a cover ring and a cover plate connected in sequence. The cover ring extends into the mold cavity from the opening and is connected to a metal ring 3. The edge of the cover plate extends out of the cover ring and abuts against the outer end face of the umbrella skirt mold. The cover plate serves two purposes: firstly, it presses the sealing ring against the end face of the cylinder 1; secondly, the edge of the cover plate abuts against the outer end face of the umbrella skirt mold, thereby sealing the mold cavity and preventing the umbrella skirt injection molding material from overflowing from the umbrella skirt mold. Thus, through this sealing cover, the cylinder can maintain its air passage connection with the inflation device while the umbrella skirt structure 2 is being injection molded.

[0089] In this embodiment of the invention, the first sealing assembly further includes an air inlet pipe connected to the air vent, and an air pressure sensor and an air pressure valve are installed on the air inlet pipe. The inflation device fills the cylinder 1 with gas through the air inlet pipe. The air pressure sensor is used to detect the air pressure inside the cylinder 1 so that the operator can control the amount of gas filled by the inflation device. The air pressure valve is used to control the gas entering and leaving the cylinder 1. Before removing the sealing cover, the air pressure valve is opened to make the pressure inside and outside the cylinder the same, so as to prevent the air pressure inside the cylinder 1 from forcing the sealing cover out when removing the sealing cover, thereby improving the safety of the operation.

[0090] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for manufacturing a lightning protection insulating cylinder, characterized in that, The lightning protection insulating cylinder includes a cylinder body (1) and a skirt structure (2) disposed on the outside of the cylinder body (1). The manufacturing method of the lightning protection insulating cylinder includes: installing a first sealing cap assembly and a second sealing cap assembly at both ends of the cylinder body (1), wherein the first sealing cap assembly has an openable and closable air hole; connecting an inflation device to the air hole and inflating the cylinder body (1) to form an inflatable cylinder body; connecting an injection machine to a skirt mold and injecting a skirt injection molding material into the surface of the inflatable cylinder body placed in the skirt mold at a first preset pressure to form a skirt structure (2) on the outside of the inflatable cylinder body, wherein the skirt injection molding material is silicone rubber; disassembling the skirt mold, the first sealing cap assembly, and the second sealing cap assembly in sequence to obtain the lightning protection insulating cylinder.

2. The method for manufacturing a lightning protection insulating cylinder according to claim 1, characterized in that, The gas pressure inside the inflation cylinder is set to a second preset pressure, which satisfies: P2 > P1 - P Max In the formula, P1 represents the first preset pressure: the maximum pressure generated on the surface of the inflatable cylinder by the injection molding material of the umbrella skirt into the umbrella skirt mold; P2 represents the second preset pressure; P Max This indicates the maximum pressure that the cylinder (1) can withstand.

3. The method for manufacturing a lightning protection insulating cylinder according to claim 2, characterized in that, After docking the injection machine with the umbrella skirt mold and injecting the umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure, the method further includes: detecting the real-time pressure in the umbrella skirt mold; calculating the real-time pressure difference between the real-time pressure and the second preset pressure; and stopping the increase of the silicone rubber injection pressure when the real-time pressure in the umbrella skirt mold is close to the first preset pressure or the real-time pressure difference reaches a preset safety threshold, wherein the preset safety threshold is not greater than the maximum pressure that the cylinder (1) can withstand.

4. The method for manufacturing a lightning protection insulating cylinder according to claim 2, characterized in that, The first preset pressure is between 10 and 12 standard atmospheres, and the second preset pressure is between 1.5 and 2 standard atmospheres.

5. The method for manufacturing a lightning protection insulating cylinder according to claim 1, characterized in that, The first sealing cap assembly and the second sealing cap assembly both include a metal ring (3) and a sealing cap. The process of installing the first sealing cap assembly and the second sealing cap assembly at both ends of the cylinder (1) includes: machining external threads at both ends of the cylinder (1) and applying sealant to the external threads to form an insulating cylinder end; installing the metal ring (3) at the insulating cylinder end; grinding, cleaning and drying the cylinder (1); and sealing the sealing cap to the metal ring (3).

6. The method for manufacturing a lightning protection insulating cylinder according to claim 1, characterized in that, The step of docking the injection machine with the umbrella skirt mold and injecting umbrella skirt injection molding material into the surface of the inflatable cylinder placed in the umbrella skirt mold at a first preset pressure to form an umbrella skirt structure on the outside of the inflatable cylinder (2) includes: placing the inflatable cylinder in the umbrella skirt mold; heating the umbrella skirt mold to between 125°C and 135°C; and injecting umbrella skirt injection molding material and vulcanizing agent into the surface of the inflatable cylinder in the umbrella skirt mold at a first preset pressure to form an umbrella skirt structure (2) through vulcanization.

7. A lightning protection insulating cylinder manufacturing equipment, characterized in that, The lightning protection insulating cylinder manufacturing equipment is used to implement the lightning protection insulating cylinder manufacturing method according to any one of claims 1 to 6. The lightning protection insulating cylinder manufacturing equipment includes a first sealing cap assembly, a second sealing cap assembly, a skirt mold, an inflation device, and an injection machine. The first sealing cap assembly and the second sealing cap assembly are respectively sealed and connected to the two ends of the cylinder (1) one by one. The first sealing cap assembly is provided with an openable and closable air hole. The air hole is connected to the inner cavity provided in the cylinder (1). Gas can be injected into the cylinder (1) or released from the cylinder (1) through the air hole. The skirt mold forms a mold cavity for accommodating the cylinder (1). The inflation device is used to inflate the cylinder (1) with gas through the air hole. The injection machine is used to squeeze the skirt raw material into the mold cavity.

8. The lightning protection insulating cylinder manufacturing equipment according to claim 7, characterized in that, Both the first sealing cap assembly and the second sealing cap assembly include a metal ring (3), a sealing ring and a sealing cap. The metal ring (3) is sleeved on the end of the cylinder (1). A sealing adhesive layer is provided between the metal ring (3) and the cylinder (1). The sealing cap is used to press the sealing ring against the end face of the metal ring (3). The sealing cap of the first sealing cap assembly is also provided with the air hole.

9. The lightning protection insulating cylinder manufacturing equipment according to claim 8, characterized in that, The umbrella skirt mold is made of stainless steel and has a cylindrical cavity inside. The cylindrical cavity is used to install the cylinder (1). The inner wall of the umbrella skirt mold has an umbrella skirt groove. The stainless steel body of the umbrella skirt mold is also equipped with a resistance wire for electric heating.

10. The lightning protection insulating cylinder manufacturing equipment according to claim 8, characterized in that, The first sealing cap assembly also includes an air inlet pipe connected to the air hole, and the air inlet pipe is equipped with a pressure sensor and a pressure valve.

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