Lightning protection insulating cylinder manufacturing method and equipment

Abstract

The invention discloses a lightning protection insulating cylinder manufacturing method and equipment, and the method comprises the steps: enabling two ends of a cylinder body to be provided with a first sealing cover assembly and a second sealing cover assembly in a one-to-one correspondence manner, and enabling the first sealing cover assembly to be provided with an air hole which can be opened and closed, then an inflation device is in butt joint with the air hole, inflation operation is conducted on the cylinder to form an inflation cylinder, then an injection machine is in butt joint with the umbrella skirt mold, umbrella skirt injection molding raw materials are injected into the inflation cylinder arranged in the umbrella skirt mold at the first preset pressure intensity, an umbrella skirt structure is formed on the outer side of the inflation cylinder in an injection molding mode, and after the umbrella skirt structure is formed through injection molding, the umbrella skirt injection molding raw materials are injected into the inflation cylinder. According to the method, the umbrella skirt mold and the sealing cover assembly can be sequentially disassembled by an operator, the problem of tube explosion of the cylinder body caused by overlarge injection pressure of an injection machine can be avoided, and compared with the prior art, the production efficiency of the lightning protection insulating cylinder can be improved, and the risk of scratching the inner wall of the cylinder body can be avoided.

Description

Technical Field

[0001] The invention relates to the field of lightning protection of power systems, and specifically provides a method and equipment for manufacturing a lightning protection insulating cylinder. Background Art

[0002] In the power grid system, there are numerous transmission lines of various voltage levels, distributed in a vertical and horizontal network. Lightning strike is one of the main causes of transmission line tripping. In recent years, line lightning arresters and lightning protection insulators have begun to be widely used for lightning protection of transmission lines. In order to reduce weight and facilitate installation, line lightning arresters and lightning protection insulators usually use composite jacketed epoxy resin insulation cylinders. Existing high-voltage line arresters, lightning protection insulators, and other lightning protection devices, such as 110-500kV line arresters, use epoxy resin insulation tubes with silicone rubber sheds encapsulating resistors. The surface sheds are typically manufactured in two ways: one is to directly place the epoxy resin tube into a shed mold, then use an injection molding machine to inject high-temperature silicone rubber into the mold under high pressure for vulcanization molding. However, due to the extremely high injection pressure and the impact of the compression and shear resistance of the epoxy resin tube wall, even relatively thick epoxy resin tubes are prone to bursting and damage during the silicone rubber high-pressure injection process. The other method is to install a support mold inside the epoxy resin tube before placing it into the shed mold. This mold adheres closely to the tube wall and provides support to prevent bursting. However, this support mold is difficult to manufacture and is costly. Different support molds are required for different diameter insulation tubes. Furthermore, the heavy support mold makes installation and removal very difficult, especially for insulation tubes longer than 1 meter. Installation and removal are time-consuming, inefficient, and costly. Furthermore, the support mold and the inner wall of the insulation tube are also prone to damage. Summary of the Invention

[0003] In view of the above-mentioned defects or shortcomings, the present invention provides a method and equipment for manufacturing a lightning protection insulation tube, aiming to solve the technical problem that the existing method for manufacturing a lightning protection insulation tube easily causes damage to the inner wall of the insulation tube.

[0004] To achieve the above-mentioned object, the present invention provides a method for manufacturing a lightning protection insulation tube, wherein the lightning protection insulation tube includes a tube body and an shed structure provided outside the tube body. The method for manufacturing the lightning protection insulation tube includes:

[0005] Install a first sealing cover assembly and a second sealing cover assembly at both ends of the cylinder, wherein the first sealing cover assembly is provided with 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 docked with the shed mold and a shed injection molding material is injected into the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form a shed structure on the outer side of the inflatable cylinder by injection molding. The shed injection molding material is silicone rubber.

[0008] The shed mold, the first sealing cover assembly and the second sealing cover assembly are disassembled in sequence to obtain a lightning protection insulation cylinder.

[0009] In an embodiment of the present invention, the pressure inside the inflatable cylinder is set to a second preset pressure, and the second preset pressure satisfies:

[0010] P2>P1-P Max ;

[0011] Wherein, P1 represents the first preset pressure: the maximum pressure generated by the shed injection molding material injected into the shed mold on the surface of the inflatable cylinder, P2 represents the second preset pressure, P Max Indicates the maximum pressure that the cylinder can withstand.

[0012] In an embodiment of the present invention, gas is first filled into the cylinder to make the air pressure in the cylinder reach a second preset pressure, the inflated cylinder is placed in the shed mold, and the shed mold is electrically heated to between 125° C. and 135° C., then the injection machine is docked with the shed mold and the shed injection molding material is injected into the surface of the inflated cylinder placed in the shed mold at the first preset pressure. The injection molding material is usually silicone rubber. The injection molding material further includes:

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

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

[0015] When the real-time pressure in the shed mold approaches the first preset pressure, or the real-time pressure difference reaches a preset safety threshold, the injection pressure of the shed injection molding material is stopped from being increased or slightly decreased, wherein the preset safety threshold is less than or equal to the maximum bearing pressure of the cylinder.

[0016] In an embodiment of the present 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 an embodiment of the present invention, the first sealing cover assembly and the second sealing cover assembly each include a metal ring and a sealing cover, and installing the first sealing cover assembly and the second sealing cover assembly at both ends of the cylinder respectively includes:

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

[0019] Install a metal ring on the end of the insulating tube;

[0020] Grind, clean and dry the cylinder;

[0021] Seal the sealing cap and the metal ring together.

[0022] In an embodiment of the present invention, docking the injection machine with the shed mold and injecting the shed injection molding material onto the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form the shed structure on the outer side of the inflatable cylinder by injection molding includes:

[0023] Placing the inflatable cylinder into the umbrella skirt mold;

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

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

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

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

[0028] In an embodiment of the present 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 body. 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. The umbrella skirt mold is usually processed and manufactured by a mold factory.

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

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

[0031] The lightning protection insulation cylinder mainly includes a cylinder body and an shed structure arranged on the outside of the cylinder body. When the above-mentioned lightning protection insulation cylinder manufacturing method is used, the first and second sealing cover assemblies are respectively installed on the two ends of the cylinder body in a one-to-one correspondence, wherein the first sealing cover assembly is provided with an openable and closable air hole, and then the inflation device is docked with the air hole and the cylinder body is inflated to form an inflatable cylinder body, and then the injection machine is docked with the shed mold and the shed injection molding material is injected into the inflatable cylinder body placed in the shed mold at a first preset pressure to inject the shed injection molding material on the outside of the inflatable cylinder body. When the umbrella skirt structure is formed, the gas in the inflatable cylinder exerts an outward pressure on the cylinder wall of the inflatable cylinder, so that the pressure exerted on the cylinder wall by the injection molding raw material of the umbrella skirt injected by the injection machine can be partially or completely offset, thereby avoiding the cylinder bursting phenomenon caused by excessive injection pressure of the injection machine. Moreover, after the umbrella skirt structure is formed by injection molding, the operator can disassemble the umbrella skirt mold and the sealing cover assembly in turn, so that the pressure in the cylinder is restored to the external atmospheric pressure. Compared with the existing technical solutions, the efficiency is higher and there is no 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

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

[0035] Figure 2 yes Figure 1 Detailed flow chart of step S100;

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

[0037] Description of Reference Numerals

[0038] 1 cylinder 2 umbrella skirt structure

[0039] 3 metal ring 31 internal thread segment

[0040] 32 external thread section 33 step surface DETAILED DESCRIPTION

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

[0042] The following describes the method and equipment for manufacturing a lightning protection insulating cylinder according to the present invention with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the present invention provides a method for manufacturing a lightning protection insulation tube, wherein the method for manufacturing a lightning protection insulation tube includes:

[0044] In step S100 , a first sealing cover assembly and a second sealing cover assembly are respectively installed on both ends of the cylinder 1 , wherein the first sealing cover assembly is provided with an openable and closable air hole.

[0045] Specifically, the lightning protection insulation tube includes a tube body 1 and an umbrella skirt structure 2 arranged on the outside of the tube body 1. The tube body 1 is penetrated to form a cavity for accommodating multiple resistors in sequence. The first sealing cover assembly and the second sealing cover assembly are sealed and connected to the two ends of the tube body 1 through a detachable structure. The end of the first sealing cover assembly is provided with an openable and closable air hole, and the end of the second sealing cover assembly is completely sealed.

[0046] Furthermore, regarding the opening and closing structure of the air hole, in some embodiments of the present application, a rubber pad can be provided on the inner end surface of the first sealing cover assembly, and the inflation device is provided with an inflation needle. The inflation needle can push the rubber pad inward from the air hole to realize the inflation of gas into the cylinder 1. After the inflation needle is pulled out, the rubber pad is pressed against the inner end surface of the sealing cover assembly under the action of air pressure to close the air hole; in some embodiments of the present application, the opening and closing structure of the air hole can also be achieved by an external air pressure valve.

[0047] Step S200 , docking the inflation device with the air hole and inflating the cylinder 1 to form an inflatable cylinder.

[0048] Step S300: docking the injection machine with the shed mold and injecting shed injection molding material onto the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form the shed structure 2 on the outer side of the inflatable cylinder;

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

[0050] Further, see Figure 3 The umbrella skirt structure 2 includes a plurality of umbrella skirt groups connected in sequence 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 a staggered manner, and the diameter d1 of the first umbrella skirt, the diameter d2 of the second umbrella skirt, and the diameter d3 of the third umbrella skirt satisfy: d3>d1>d2.

[0051] Step S400: disassembling the shed mold and the sealing cover assembly in sequence to obtain a lightning protection insulation cylinder.

[0052] The lightning protection insulation cylinder mainly includes a cylinder body 1 and an shed structure 2 arranged on the outside of the cylinder body 1. When the above-mentioned lightning protection insulation cylinder manufacturing method is used, the first and second sealing cover assemblies are respectively installed on both ends of the cylinder body 1 in a one-to-one correspondence, wherein the first sealing cover assembly is provided with an openable and closable air hole, and then the inflation device is docked with the air hole and the cylinder body 1 is inflated to form an inflatable cylinder body, and then the injection machine is docked with the shed mold and the shed injection molding material is injected into the inflatable cylinder body placed in the shed mold at a first preset pressure to inject the shed injection molding material on the outside of the inflatable cylinder body. When the umbrella skirt structure 2 is formed, the gas in the inflatable cylinder exerts an outward pressure on the cylinder wall of the inflatable cylinder, so that the pressure exerted on the cylinder wall by the injection molding raw material of the umbrella skirt injected by the injection machine can be partially or completely offset, thereby avoiding the tube burst phenomenon of the cylinder 1 caused by excessive injection pressure of the injection machine. Moreover, after the umbrella skirt structure 2 is formed by injection molding, the operator can disassemble the umbrella skirt mold and the sealing cover assembly in turn, so that the pressure in the cylinder 1 is restored to the external atmospheric pressure. Compared with the existing technical solution, the efficiency is higher and there is no risk of scratching the inner wall of the cylinder 1.

[0053] In an embodiment of the present invention, the pressure inside the inflatable cylinder is set to a second preset pressure, and the second preset pressure satisfies:

[0054] P2>P1-P Max ;

[0055] Where, P1 represents the first preset pressure: the maximum pressure on the surface of the inflatable cylinder generated by the shed injection molding material injected into the shed mold, P2 represents the second preset pressure, P Max Indicates the maximum pressure that cylinder 1 can withstand.

[0056] By setting a second preset pressure, the pressure difference between the inside and outside of the inflatable cylinder is ensured to be less than or equal to the maximum pressure of the cylinder 1 during the production of the shed structure, thereby preventing the possibility of tube burst. Specifically, a pressure sensor can be installed in the gas path from the inflator to the cylinder 1 to assist the operator in controlling the amount of gas injected into the cylinder 1.

[0057] In an embodiment of the present invention, after step S300 of docking the injection machine with the shed mold and injecting the shed injection molding material onto the surface of the inflatable cylinder placed in the shed mold at a first preset pressure, the method further includes:

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

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

[0060] When the real-time pressure difference reaches a preset safety threshold, 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 between the inside and outside of the cylinder 1 can be adjusted in real time to prevent the cylinder 1 from bursting under a larger 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 , in order to prevent tube bursting during inflation, under normal circumstances, the injection molding machine injects the shed molding material at a pressure between 10 and 12 standard atmospheres, and the maximum pressure that the cylinder 1 can withstand is generally around 10 standard atmospheres. The second preset pressure of the gas pre-filled into the cylinder 1 can reach 1 to 2 standard atmospheres, and the gas pre-filled into the cylinder 1 will not cause tube bursting. However, if the injection molding machine injects the shed molding material at a first preset pressure far higher than the maximum pressure that the cylinder 1 can withstand, the second preset pressure of the gas filled into the inflation device will also exceed the maximum pressure that the cylinder 1 can withstand. In this case, through 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, so 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. In addition, by setting a preset safety threshold, the occurrence of tube bursting can be further avoided. Accordingly, a pressure sensor needs to be provided in the shed mold; a sealing cover needs to extend out of the shed mold, or a channel for the inflatable device to extend into is opened on the shed mold.

[0062] In an embodiment of the present 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] like Figure 2 As shown, in an embodiment of the present invention, the first sealing cover assembly and the second sealing cover assembly both include a metal ring 3 and a sealing cover. Step S100, installing the first sealing cover assembly and the second sealing cover assembly at both ends of the cylinder 1 in a one-to-one correspondence includes:

[0064] Step S110: external threads are processed on both ends of the cylinder 1 and sealant is applied on the external threads to form insulating cylinder ends;

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

[0066] Step S120, installing the metal ring 3 at the end of the insulating cylinder;

[0067] Specifically, the metal rings 3 are made from stainless steel pipe. First, a cutting machine is used to cut two metal rings 3 with a height of 5 cm to 10 cm from the stainless steel pipe. A thread milling machine is then used to mill the inner and outer surfaces of the metal rings 3 into threads, forming end metal rings 3 with internal and external thread structures. The metal rings 3 are threadedly connected to the cylinder 1, and a sealant is provided between the two to improve the sealing effect and prevent gas from escaping from the cylinder 1 under high-pressure conditions. The external threads of the metal rings 3 also serve as a connecting structure during the subsequent installation process of the lightning protection insulation cylinder, allowing for quick disassembly and assembly.

[0068] Step S130, grinding, cleaning and drying the cylinder 1;

[0069] Polishing and cleaning remove burrs and excess sealant from the cylinder 1, leaving it smooth and clean, improving the reliability of the shed structure 2's attachment to the cylinder 1. Drying removes moisture, facilitating adhesion of the shed's injection molding material to the cylinder 1. It also ensures the sealant fully cures, preventing gaps between the cylinder 1 and the metal ring 3 and ensuring a secure seal even in high-temperature, high-pressure environments. Specifically, the drying temperature is 105°C to 110°C, and the drying time is 0.5 to 1 hour.

[0070] Step S140: sealingly connecting the sealing cover to the metal ring 3.

[0071] The sealing cover assembly is a split-piece design, with the metal ring 3 integrally connected to the cylinder 1. The sealing cover and metal ring 3 are detachably connected, facilitating placement of the resistor within the cylinder 1 after the shed structure 2 has cured. Specifically, a sealing ring is positioned between the sealing cover and the metal ring 3. The metal ring 3 serves as a connection during the subsequent installation of the lightning protection insulation cylinder and does not require disassembly. Therefore, the seal between the metal ring 3 and the cylinder 1 is achieved directly using sealant. The sealing cover, however, requires disassembly and reuse, so the sealing ring ensures a good seal while also preventing subsequent disassembly.

[0072] In an embodiment of the present invention, step S300, docking the injection machine with the shed mold and injecting the shed injection molding material onto the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form the shed structure 2 on the outer side of the inflatable cylinder by injection molding, includes:

[0073] Placing the inflatable cylinder into the umbrella skirt mold;

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

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

[0076] Specifically, the injection molding material of the umbrella skirt is silicone rubber. Under high temperature environment, silicone rubber reacts with vulcanizing agent to form 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 use environment.

[0077] In a specific embodiment of the present invention, the manufacturing method of 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 tube) are cut out of a metal tube, and 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 processed at the two ends of the epoxy resin tube. After applying adhesive epoxy resin glue on the external threads of the epoxy resin ends, the two metal rings 3 are respectively installed at the two ends of the epoxy resin tube. After the adhesive epoxy resin is cured, the cylinder body 1 of the lightning protection insulation tube is made.

[0080] Then, after polishing and cleaning the outer surface of the cylinder 1, place it in an oven and dry it at 110°C for 30 minutes. Then, place the sealing ring on the end of the epoxy resin cylinder inside the metal ring 3. After the sealing cover is used to compress and seal the insulating cylinder body 1, dry air is filled into the insulating cylinder through the air holes on the sealing cover to ensure that the inside of the insulating cylinder has a standard atmospheric pressure of 1 to 2. Since the epoxy resin material usually has 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 in the mold cavity of the silicone rubber umbrella skirt mold. When the mold is heated to 135°C, silicone rubber and vulcanizer are injected into the mold cavity of the umbrella skirt mold through an injection machine at 11 standard atmospheric pressures. After the silicone rubber is vulcanized and extruded at high temperature in the mold cavity, 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 covers and sealing rings at both ends are removed to make a complete lightning protection insulating cylinder.

[0082] The lightning protection insulating tube has an end metal ring 3 with a connecting function, which provides an easy assembly and excellent sealing structure. Before the silicone rubber is vulcanized at high temperature, the insulating tube is filled with a certain pressurized dry air, which reduces the impact of the silicone rubber injection pressure on the insulating tube, effectively prevents the epoxy resin tube from bursting or cracking, and improves the efficiency of lightning protection insulating tube manufacturing and the product qualification rate.

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

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

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

[0086] Furthermore, a step surface 33 facing another sealing component is formed on the metal ring 3, and a sealing portion abutting the step surface 33 is formed on the shed mold. The external thread section 32 is located on the side of the step surface 33 away from the sealing portion. The cooperation between the sealing portion and the step surface 33 can prevent the shed injection molding material from overflowing to the connection position between the metal ring 3 and the sealing cover under high pressure, thereby facilitating the subsequent disassembly of the sealing cover.

[0087] In an embodiment of the present 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 present invention, both ends of the shed mold are formed with openings connecting the mold cavity to the outside world. A sealing cap comprises a cover ring body and a cover plate body, which are connected in sequence. The cover ring body extends from the opening into the mold cavity and is connected to the metal ring 3. The edge of the cover plate body extends beyond the cover ring body and abuts the outer end face of the shed mold. The cover plate body, on the one hand, serves to tighten the sealing ring against the end face of the barrel 1. On the other hand, the edge of the cover plate body abuts the outer end face of the shed mold, sealing the mold cavity and preventing the shed injection molding material from overflowing the shed mold. This sealing cap maintains the air path connection between the barrel and the inflation device while the shed structure 2 is being injection molded.

[0089] In an embodiment of the present invention, the first sealing assembly further includes an air inlet line connected to the air hole, which is equipped with an air pressure sensor and an air pressure valve. The inflator fills the cylinder 1 with air through the air inlet line. The air pressure sensor detects the air pressure within the cylinder 1, allowing the operator to control the amount of air introduced by the inflator. The air pressure valve controls the flow of air into and out of the cylinder 1. Before removing the sealing cover, the air pressure valve is opened to equalize the pressure inside and outside the cylinder. This prevents the air pressure within the cylinder 1 from dislodging the sealing cover, thereby improving operational safety.

[0090] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0091] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0092] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0093] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for manufacturing a lightning protection insulating tube, characterized in that: The lightning protection insulating tube comprises a tube body (1) and an shed structure (2) arranged outside the tube body (1). The method for manufacturing the lightning protection insulating tube comprises: A first sealing cover assembly and a second sealing cover assembly are respectively installed at two ends of the cylinder (1), wherein the first sealing cover assembly is provided with an openable and closable air hole; The inflating device is connected to the air hole and the cylinder (1) is inflated to form an inflatable cylinder; The injection machine is docked with the shed mold and a shed injection molding material is injected into the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form a shed structure (2) on the outer side of the inflatable cylinder, wherein the shed injection molding material is silicone rubber; The shed mold, the first sealing cover assembly and the second sealing cover assembly are disassembled in sequence to obtain a lightning protection insulating tube.

2. The method for manufacturing a lightning protection insulating tube according to claim 1, characterized in that: The gas pressure in the inflatable cylinder is set to a second preset pressure, and the second preset pressure satisfies: P2>P1-P Max ; Wherein, P1 represents the first preset pressure: the maximum pressure on the surface of the inflatable cylinder generated by the shed injection molding material injected into the shed mold, P2 represents the second preset pressure, P Max Indicates the maximum pressure that the cylinder (1) can withstand.

3. The method for manufacturing a lightning protection insulating tube according to claim 2, characterized in that: After the injection machine is docked with the shed mold and the shed injection molding material is injected into the surface of the inflatable cylinder placed in the shed mold at a first preset pressure, the following further comprises: Detect the real-time pressure inside the shed mold; Calculating a real-time pressure difference between the real-time pressure and the second preset pressure; When the real-time pressure in the shed mold approaches the first preset pressure, or the real-time pressure difference reaches a preset safety threshold, the injection pressure of the silicone rubber is stopped from being increased, wherein the preset safety threshold is not greater than the maximum bearing pressure of the cylinder (1).

4. The method for manufacturing a lightning protection insulating tube 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 tube according to claim 1, characterized in that: The first sealing cover assembly and the second sealing cover assembly both comprise a metal ring (3) and a sealing cover, and the steps of respectively installing the first sealing cover assembly and the second sealing cover assembly at both ends of the cylinder (1) comprise: External threads are respectively processed at both ends of the cylinder (1) and sealant is applied to the external threads to form insulating cylinder ends; A metal ring (3) is installed at the end of the insulating tube; Grinding, cleaning and drying the cylinder (1); The sealing cover is tightly connected to the metal ring (3).

6. The method for manufacturing a lightning protection insulating tube according to claim 1, characterized in that: The method of docking the injection machine with the shed mold and injecting the shed injection molding material onto the surface of the inflatable cylinder placed in the shed mold at a first preset pressure to form the shed structure (2) on the outer side of the inflatable cylinder by injection molding comprises: Placing the inflatable cylinder in the shed mold; Heat the shed mold to between 125°C and 135°C; The shed injection molding material and the vulcanizing agent are injected into the surface of the inflatable cylinder in the shed mold at a first preset pressure to vulcanize and form the shed structure (2).

7. A lightning protection insulation tube manufacturing equipment, characterized in that: The invention comprises a first sealing cover assembly, a second sealing cover assembly, an shed mold, an inflation device and an injection molding machine. The first sealing cover assembly and the second sealing cover assembly are respectively sealed and connected to two ends of a cylinder (1) in a one-to-one correspondence. The first sealing cover assembly is provided with an openable and closable air hole, which is communicated with an 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 shed mold is formed with a mold cavity for accommodating the cylinder (1). The inflation device is used for inflating gas into the cylinder (1) through the air hole. The injection molding machine is used for squeezing the shed raw material into the mold cavity.

8. The lightning protection insulation tube manufacturing equipment according to claim 7 is characterized in that: The first sealing cover assembly and the second sealing cover assembly both comprise a metal ring (3), a sealing ring and a sealing cover; the metal ring (3) is sleeved on the end of the cylinder (1); a sealing rubber layer is provided between the metal ring (3) and the cylinder (1); the sealing cover is used to press the sealing ring onto the end surface of the metal ring (3); and the air hole is also provided on the sealing cover of the first sealing assembly.

9. The lightning protection insulation tube manufacturing equipment according to claim 8, characterized in that: The shed 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 shed mold has a shed groove. The stainless steel body of the shed mold is also provided with a resistance wire for electric heating.

10. The lightning protection insulation tube manufacturing equipment according to claim 8, characterized in that: The first sealing component also includes an air intake pipeline connected to the air hole, and an air pressure sensor and an air pressure valve are arranged on the air intake pipeline.

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