Method for insulating an overhead high-voltage electric line

Abstract

The present application relates to a kind of insulation covering method of overhead high-voltage electric wire, using solid insulation profile to surround high-voltage electric wire, after the overlap lap joint of its enclosure is bonded, by the way of hot pressing along the length direction of high-voltage electric wire, the insulation profile is shaped.Compared with prior art, the present application uses solid profile instead of liquid material for coating, and the insulation profile is self-fusion during coating, so most of the insulation profile will not change phase, so its mechanical properties will not change.In addition, the present application uses the way of hot pressing while advancing to process, in addition to material fusion, it also completes additional work such as air removal, cable lamination, shaping, etc., so that the insulation layer after coating can achieve the ideal design requirements to the greatest extent, and can significantly improve the operation speed, with the advantages of simple and easy, fast coating speed, high operation efficiency, etc., with good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead cable operations, and in particular to an insulation covering method for overhead high-voltage electric wires. Background Art

[0002] Currently, the majority of overhead high-voltage power lines in my country are bare conductors. While these bare distribution network conductors previously offered advantages such as cost savings and ease of construction, their drawbacks have become increasingly apparent over time. For example, bare conductors can easily come into contact with trees, buildings, blowing debris, birds, and other objects, causing short circuits. They can also fall into water, causing tripping of circuit breakers or electric shocks.

[0003] One solution to this problem is to replace bare conductors with insulated cables. However, this approach is difficult to implement, takes a long time, and requires power outages during the operation, causing significant inconvenience to production and daily life. Therefore, the current approach to retrofitting existing overhead lines is to directly coat the bare conductors with insulation.

[0004] For example, Chinese invention patent CN107611844B discloses an overhead line insulation covering robot system and its control method, in which the robot walks along the overhead cable, while the insulating coating supply device controls the insulating coating supply speed, and transports the insulating coating to the insulating coating mechanism through a pipeline. The insulating coating mechanism covers the overhead cable with the insulating coating to complete the insulation covering of the overhead line.

[0005] However, as documented in the aforementioned documents, existing insulation coating methods all employ coating or extrusion of liquid insulating materials, such as insulating adhesives or molten resins. During this process, these insulating coatings undergo a phase transition, solidifying from a liquid phase to a solid insulating film. This process can alter the stress state between the particles within the film, leading to shrinkage holes or cracks on the surface of the film after solidification. This can also lead to discrepancies between the mechanical properties of the formed material and those of the pre-calculated material, compromising the insulation performance of the coating. Summary of the Invention

[0006] In view of this, it is necessary to provide an insulation coating method for overhead high-voltage wires to solve the problem that the insulation film after solidification cannot achieve good insulation effect due to the use of liquid coating in the existing insulation coating method.

[0007] The present invention provides an insulation coating method for overhead high-voltage electric wires, comprising:

[0008] S1. Use a solid insulating profile to wrap the high-voltage wire along the length direction and around the axis of the high-voltage wire, with the width direction of the insulating profile perpendicular to the length direction of the high-voltage wire, and the two sides of the insulating profile in the width direction overlapping;

[0009] S2. Bond the overlapping joints of the insulating profiles;

[0010] S3. Use a hot pressing tool to hot press the insulating profile, and at the same time move the hot pressing tool along the length direction of the high-voltage wire to remove the air between the insulating profile and the high-voltage wire and make the insulating profile adhere to the surface of the high-voltage wire to form an integrated insulated cable.

[0011] Preferably, the hot pressing tool includes at least two hot pressing rollers, which are arranged around the high-voltage wire. The hot pressing roller includes a roller body and a heater built into the roller body. The roller body is made of a heat-conductive material. The rotation axis of the roller body is perpendicular to the high-voltage wire, and the circumferential surface of the roller body fits the insulating profile.

[0012] Preferably, the circumference of the roller body is recessed toward the axial direction of the roller body and fits the insulating profile.

[0013] Preferably, the hot pressing tool also includes a pressurizing motor, a screw-nut mechanism and a base plate, the fixed end of the pressurizing motor is connected to the base plate, the rotating end of the pressurizing motor is coaxially fixedly connected to the screw in the screw-nut mechanism, there are two hot pressing rollers, the axes of the two roller bodies are perpendicular to the screw in the screw-nut mechanism, one hot pressing roller is connected to the nut in the screw-nut mechanism, and the other hot pressing roller is connected to the base plate.

[0014] Preferably, the hot pressing tool also includes a walking assembly, which includes a walking wheel and a walking motor. The walking wheel is rotatably connected to the substrate, the rotation axis of the walking wheel is parallel to the substrate and perpendicular to the high-voltage wire, the walking wheel and the substrate are respectively located on both sides of the high-voltage wire, the fixed end of the walking motor is connected to the substrate, and the output end of the walking motor is connected to the walking wheel.

[0015] Preferably, in S2, the overlapping joints of the insulating profiles are bonded by hot pressing.

[0016] Preferably, the length direction of the insulating profile is the same as the extension direction of the high-voltage wire, and the length of the insulating profile is greater than or equal to 50 m.

[0017] Preferably, the thickness of the insulating profile is 1.5 mm to 3.5 mm.

[0018] Preferably, in S2, the material of the insulating profile includes rubber, the pressure value used for hot pressing is 1kg to 5kg, and the temperature used is 140°C to 220°C.

[0019] Preferably, in S3, the material of the insulating profile includes rubber, the pressure value used in the hot pressing is 1kg to 5kg, and the temperature used is 140°C to 220°C.

[0020] The present invention provides an insulation covering method for overhead high-voltage electric wires, which uses a solid insulating profile to surround the high-voltage electric wires, and after the overlapping joints after the encirclement are bonded, the insulating profile is shaped by moving forward and hot pressing along the length direction of the high-voltage electric wires. During the moving forward process, air between the insulating profile and the high-voltage electric wires can be removed, so that the inner surface of the insulating profile after the encirclement fits the high-voltage electric wires. At the same time, defects on the outer surface of the insulating profile after the encirclement, such as shrinkage holes and cracks, can be removed, so that the surface of the overlapping joints of the insulating profiles is smooth and free of protrusions, forming an integrated insulated cable.

[0021] Compared to the existing technology, the present invention uses solid profiles rather than liquid materials for coating. During the coating process, the insulating profiles are self-fused, and most of the insulating profiles will not undergo phase transformation, so their mechanical properties will not change. In addition, traditional hot pressing operations require holding the material in one position for a period of time to allow the material to fuse and shape. The present invention uses a forward-moving hot pressing method to process the material. In addition to fusing the material, it also completes additional tasks such as removing air, bonding the cable, and shaping. This allows the insulating layer after coating to meet the ideal design requirements to the greatest extent possible and can significantly increase the operation speed. It has the advantages of being simple and easy to operate, fast coating speed, and high operation efficiency, and has a good application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a hot pressing tool in an embodiment of the insulation coating method for overhead high-voltage wires provided by the present invention. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0024] The present invention provides an embodiment of an insulation coating method for an overhead high-voltage electric wire. The insulation coating method for an overhead high-voltage electric wire specifically includes:

[0025] S1. Use a solid insulating profile to wrap the high-voltage wire along the length direction and around the axis of the high-voltage wire, with the width direction of the insulating profile perpendicular to the length direction of the high-voltage wire, and the two sides of the insulating profile in the width direction overlapping;

[0026] S2. Bond the overlapping joints of the insulating profiles;

[0027] S3. Use a hot pressing tool to hot press the insulating profile, and at the same time move the hot pressing tool along the length direction of the high-voltage wire to remove the air between the insulating profile and the high-voltage wire and make the insulating profile adhere to the surface of the high-voltage wire to form an integrated insulated cable.

[0028] The present invention provides an insulation covering method for overhead high-voltage electric wires, which uses a solid insulating profile to surround the high-voltage electric wires, and after the overlapping joints after the encirclement are bonded, the insulating profile is shaped by moving forward and hot pressing along the length direction of the high-voltage electric wires. During the moving forward process, air between the insulating profile and the high-voltage electric wires can be removed, so that the inner surface of the insulating profile after the encirclement fits the high-voltage electric wires. At the same time, defects on the outer surface of the insulating profile after the encirclement, such as shrinkage holes and cracks, can be removed, so that the surface of the overlapping joints of the insulating profiles is smooth and free of protrusions, forming an integrated insulating cable and achieving a better insulation effect.

[0029] The following will explain each of the above steps in more detail:

[0030] As a preferred embodiment, in this embodiment, before performing the above-mentioned S1, the surface of the high-voltage wire to be coated can be cleaned to ensure that the surface of the high-voltage wire is free of dust, rainwater, or other impurities that may adhere to the surface of the high-voltage wire under high-voltage conditions before coating. At the same time, the surface of the high-voltage wire can also be inspected to detect defects to eliminate safety hazards that may occur after coating.

[0031] In S1 of this embodiment, the insulating profile can be wrapped around the surface of the high-voltage wire manually. When the high-voltage wire is short, a person can directly climb up the pole to perform the work. When the high-voltage wire is long, a lifting platform or aerial work vehicle can be used to carry the operator to the height of the high-voltage wire to perform the wrapping. Of course, robots can also be used to perform automated work on the high-voltage wire.

[0032] Furthermore, the insulating profile in this embodiment is in the form of a long, strip-shaped sheet. During wrapping, the length of the insulating profile is parallel to the extension direction of the high-voltage wire, while the width and thickness directions are both perpendicular to its length and orthogonal to it. During wrapping, the width edges of the insulating profile in this embodiment are bent along the thickness direction, with the axis of the high-voltage wire as the axis. The width edges of the insulating profile are then overlapped and joined together, enclosing the high-voltage wire and achieving a good airtight seal.

[0033] Specifically, the length of the insulating profile in this embodiment is greater than or equal to 50 meters. This allows for ample margins at both ends of the insulating profile in the longitudinal direction, allowing it to handle most existing high-voltage power lines. This allows the wrapping operation to be completed on two poles in one go, eliminating the need to wrap multiple insulating profiles multiple times. This reduces the hassle of subsequent splicing, minimizes gaps, and improves wrapping efficiency.

[0034] Furthermore, the width of the insulating profile in this embodiment is greater than the circumference of the high-voltage wire. When the insulating profile is a shape other than a rectangle, its minimum width in the width direction is greater than the circumference of the high-voltage wire's outer diameter. This allows the insulating profile to overlap and connect at both ends after enclosing the high-voltage wire, improving ease of operation during sealing and enhancing sealing after subsequent hot pressing.

[0035] Furthermore, the thickness of the insulating profile in this embodiment is perpendicular to the extension direction of the high-voltage wire, that is, extending radially along the high-voltage wire. The thickness of the insulating profile is 1.5 mm to 3.5 mm. This makes the insulating profile easy to bend and easy to handle, while also ensuring that the insulation layer surrounding the high-voltage cable has sufficient thickness, achieving good insulation and preventing easy damage.

[0036] The insulating profile in this embodiment can be made of any existing insulating material, which can be a single-component material or a composite material, such as a polymer, etc. The most typical examples are rubber or polyethylene, or a composite material containing the two.

[0037] Rubber refers to a highly elastic polymer material with reversible deformation. It is highly elastic at room temperature and can deform significantly under minimal external force, returning to its original shape upon removal. Rubber is a completely amorphous polymer, available in two types: natural rubber and synthetic rubber. It is inexpensive to obtain and easy to process, making it widely used in various areas of life.

[0038] Polyethylene (PE) is a thermoplastic resin made by polymerizing ethylene. Industrially, it also includes copolymers of ethylene with small amounts of α-olefins. Polyethylene is odorless, non-toxic, and waxy to the touch. It has excellent low-temperature resistance (minimum operating temperature can reach -100 to -70°C), good chemical stability, and resistance to most acids and bases (but not oxidizing acids). It is insoluble in common solvents at room temperature, has low water absorption, and possesses excellent electrical insulation properties.

[0039] It is understandable that the shapes, sizes and other features of the above two materials and insulating profiles are only used as an example of a preferred embodiment. In practice, they can be flexibly designed according to specific circumstances and are not limited to this embodiment.

[0040] Furthermore, in step S2 of this embodiment, the overlapping portions of the insulating profiles are bonded together using hot pressing. This can be accomplished using a common tool such as a soldering iron, or using a hot pressing tool described later in S3. As a preferred embodiment, the temperature and pressure used in the hot pressing step S2 of this embodiment are the same as those used later in S3, so that the insulating profiles can be bonded and shaped using a single tool.

[0041] It is understandable that, in practice, in addition to hot pressing, this step can also be performed by other existing methods, such as gluing, binding, etc. In addition, S2 can be performed simultaneously with S1, that is, the overlapping joints are bonded while wrapping the insulating profile.

[0042] As a preferred embodiment, in S3 of this embodiment, a hot pressing tool is used to complete the shaping of the insulating profile. The pressure value used during hot pressing is 1kg to 5kg, and the temperature used is 140°C to 220°C. The above pressures and temperatures can be easily achieved using existing tools. In this embodiment, the hot pressing tool can be replaced with existing tools, such as soldering irons, etc., and the insulating profile is clamped by manually holding multiple soldering irons and dragged along the high-voltage wire to complete S3. However, the pressure and temperature values ​​of the above method cannot be guaranteed, and it is not easy to complete the action of hot pressing and dragging at high altitudes, which is dangerous. Therefore, this embodiment also provides a hot pressing tool for completing S3 more conveniently, which will be described in more detail below:

[0043] Combine Figure 1 As shown, as a preferred embodiment, the hot pressing tool 1 in this embodiment includes at least two hot pressing rollers 11. At least two hot pressing rollers 11 are arranged around the high-voltage wire 100 wrapped with an insulating profile, and the hot pressing roller 11 includes a roller body and a heater built into the roller body. The roller body is made of a heat-conducting material, such as a metal with good thermal conductivity, and the heater can be a conventional heating wire, the heat emitted by which can be conducted to the insulating profile through the roller body. The rotation axis of the roller body is perpendicular to the high-voltage wire 100, and the circumferential surface of the roller body is in contact with the insulating profile.

[0044] In this way, the hot pressing tool 1 can be conveniently dragged along the direction of the high-voltage wire 100 while providing heat to the insulating profile. During dragging, the roller moves along the surface of the insulating profile, and while reshaping the surface of the insulating profile to eliminate its surface defects, pressure can also be provided through existing clamps or manual pressure. The air inside the insulating profile is squeezed out while rolling, so that the inner surface of the insulating profile and the high-voltage wire 100 fit together to form an integrated insulated cable, which greatly improves the insulation effect and the convenience of operation.

[0045] Furthermore, as a preferred embodiment, the circumference of the roller body in this embodiment is recessed toward the axial direction of the roller body and fits the insulating profile, so that the roller body can better fit the insulating profile and achieve a good hot pressing effect.

[0046] As a preferred embodiment, the hot pressing tool 1 in this embodiment further includes a pressurizing motor 12, a screw-nut mechanism 13, and a base plate 14. The fixed end of the pressurizing motor 12 is connected to the base plate 14, and the rotating end of the pressurizing motor 12 is coaxially fixedly connected to the screw in the screw-nut mechanism 13. There are two hot pressing rollers 11, the axes of both rollers being perpendicular to the screw in the screw-nut mechanism 13. One hot pressing roller 11 is connected to the nut in the screw-nut mechanism 13, and the other hot pressing roller 11 is connected to the base plate 14. The circumferences of the two rollers substantially enclose the wrapped insulating profile.

[0047] When the pressure motor 12 rotates, it drives the screw in the screw-nut mechanism 13 to rotate, causing the nut to move along the screw's axis, which in turn drives the roller connected to it to move toward or away from the base plate 14. In this embodiment, the other roller is fixed relative to the base plate 14. This allows the pressure motor 12 to control the two rollers to move closer together, applying pressure to the insulating profile between them, while not affecting their movement along the high-voltage cable.

[0048] As a preferred embodiment, the rotating motor and the screw-nut mechanism 13 in this embodiment are both two, respectively connected to the two ends of the roller. On the one hand, it can limit part of the freedom of the roller to prevent it from rotating with the screw. On the other hand, it can also make the pressure applied by the roller more balanced.

[0049] It is understood that in practice, other numbers of rollers can be provided, in conjunction with other numbers of pressurizing motors 12 and screw-nut mechanisms 13 to achieve hot pressing. For example, the base plate 14 is annular and surrounds the high-voltage cable. Multiple rollers are disposed within the ring of the base plate 14 and are respectively connected to the screw-nut mechanisms 13 mounted on the base plate 14. Multiple pressurizing motors 12 are disposed outside the ring of the base plate 14 and are connected to the screw-nut mechanisms 13 in a one-to-one correspondence to drive them. When the multiple rollers simultaneously move away from the base plate 14, they simultaneously converge toward the insulating profile, applying pressure.

[0050] Furthermore, the hot pressing tool 1 in this embodiment also includes a walking assembly 15, which includes a walking wheel 151 and a walking motor 152. The walking wheel 151 is rotatably connected to the base plate 14, and the rotation axis of the walking wheel 151 is parallel to the base plate 14 and perpendicular to the high-voltage wire 100. The walking wheel 151 and the base plate 14 are respectively located on both sides of the high-voltage wire 100. The fixed end of the walking motor 152 is connected to the base plate 14, and the output end of the walking motor 152 is connected to the walking wheel 151. The walking motor 152 drives the walking wheel 151 to rotate so that the entire hot pressing tool 1 moves along the high-voltage wire 100, and hot pressing is achieved by the roller. In this way, the automatic operation of S3 can be realized to solve the problem that manual operation is difficult and the hot pressing quality is difficult to control.

[0051] Furthermore, as a preferred embodiment, in S3 of this embodiment, hot pressing may be performed multiple times, preferably at least three times, specifically:

[0052] In the at least three hot pressing steps in S2, one of the hot pressing steps is primarily to expel air and allow the surface of the insulating profile facing the high-voltage wire to adhere to the high-voltage wire. This eliminates gaps between the high-voltage wire and the insulating profile, improving insulation effectiveness. It also prevents foreign matter from entering between the high-voltage wire and the insulating profile, particularly at the ends of the insulating profile, thereby reducing the probability of corrosion, short circuits, and other faults in the high-voltage wire.

[0053] In this embodiment, another hot pressing operation is mainly to perform hot pressing on the enclosed portion of the insulating profile to enhance the bonding effect of the enclosed portion of the insulating profile.

[0054] The third hot pressing in this embodiment is primarily to eliminate seams on the surface of the insulating profile. This hot pressing serves a shaping function, making the outer surface of the insulating profile smoother and eliminating defects such as bumps and gaps on the surface of the insulating profile, thereby improving the insulation effect and durability.

[0055] The following are several comparative cases of coating under different temperature and pressure parameters, different hot pressing times, etc., to further demonstrate the effectiveness of this method:

[0056]

[0057]

[0058] As can be seen from the aforementioned comparative examples, the insulation coating method for overhead high-voltage power lines of this embodiment can eliminate surface defects in the coated insulating profile, resulting in improved insulation performance. Furthermore, as can be seen from Comparative Example 1 and this embodiment, the method of this embodiment allows for the use of lower pressures and temperatures during hot pressing, resulting in greater safety. Furthermore, these pressures and temperatures can be easily achieved using conventional equipment, making them easier to implement.

[0059] It is also worth mentioning that the insulation coating method for overhead high-voltage wires in this embodiment allows the coating operation to be performed at a faster speed. For example, by comparing the above-mentioned Comparative Examples 1, 2, and 3 with this embodiment, it can be seen that because this embodiment does not need to stop and maintain during hot pressing, the speed of each hot pressing operation is obviously faster than the speed of hot pressing in Comparative Example 1. And it can be easily concluded from calculations that even if hot pressing is performed three times back and forth along the high-voltage cable in this embodiment, the total time required is less than the time required in Comparative Example 1. Furthermore, in practice, three coating robots arranged in sequence can also be used. For example, in this embodiment, the hot pressing tool is fixed and walks along the high-voltage cable at the same time, and the insulating profile is hot pressed in the manner of an assembly line. In this way, multiple hot pressing operations can be performed with only one walk, which greatly improves the operation speed. The same is true for the method of manually using tools.

[0060] In summary, the present invention provides an insulation covering method for overhead high-voltage wires, which uses a solid insulating profile to surround the high-voltage wire, and after the overlapping joints after the encirclement are bonded, the insulating profile is shaped by moving forward and hot pressing along the length direction of the high-voltage wire. During the moving forward process, the air between the insulating profile and the high-voltage wire can be removed, so that the inner surface after the encirclement fits the high-voltage wire. At the same time, the defects of the outer surface of the insulating profile after encirclement, such as shrinkage holes, cracks, etc., can be removed, so that the surface of the overlapping joints of the insulating profile is smooth and has no protrusions, forming an integrated insulated cable.

[0061] Compared to the existing technology, the present invention uses solid profiles rather than liquid materials for coating. During the coating process, the insulating profiles are self-fused, and most of the insulating profiles will not undergo phase transformation, so their mechanical properties will not change. In addition, traditional hot pressing operations require holding the material in one position for a period of time to allow the material to fuse and shape. The present invention uses a forward-moving hot pressing method to process the material. In addition to fusing the material, it also completes additional tasks such as removing air, bonding the cable, and shaping. This allows the insulating layer after coating to meet the ideal design requirements to the greatest extent possible and can significantly increase the operation speed. It has the advantages of being simple and easy to operate, fast coating speed, and high operation efficiency, and has a good application prospect.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for insulating and coating an overhead high-voltage electric wire, characterized in that: include: S1. Wrapping a high-voltage wire with a solid insulating profile along its length and around its axis, with the width of the insulating profile perpendicular to the length of the high-voltage wire and the width of the insulating profile overlapping. S2, bonding the overlapping joints of the insulating profiles; S3. hot-pressing the insulating profile using a hot-pressing tool while moving the hot-pressing tool along the length direction of the high-voltage wire to remove air between the insulating profile and the high-voltage wire and to adhere the insulating profile to the surface of the high-voltage wire to form an integrated insulated cable; The hot pressing tool includes at least two hot pressing rollers, which are arranged around the high-voltage wire. The hot pressing rollers include a roller body and a heater built into the roller body. The roller body is made of a heat-conducting material. The rotation axis of the roller body is perpendicular to the high-voltage wire. The circumference of the roller body is in contact with the insulating profile. The hot pressing tool also includes a pressurizing motor, a screw-nut mechanism and a base plate, wherein the fixed end of the pressurizing motor is connected to the base plate, and the rotating end of the pressurizing motor is coaxially fixedly connected to the screw in the screw-nut mechanism. There are two hot pressing rollers, and the axes of the two roller bodies are perpendicular to the screw in the screw-nut mechanism. One hot pressing roller is connected to the nut in the screw-nut mechanism, and the other hot pressing roller is connected to the base plate. The hot pressing tool also includes a walking assembly, which includes a walking wheel and a walking motor. The walking wheel is rotatably connected to the base plate, and the rotation axis of the walking wheel is parallel to the base plate and perpendicular to the high-voltage wire. The walking wheel and the base plate are respectively located on both sides of the high-voltage wire. The fixed end of the walking motor is connected to the base plate, and the output end of the walking motor is connected to the walking wheel.

2. The insulation coating method for overhead high-voltage electric wires according to claim 1, characterized in that: The circumference of the roller body is recessed in the axial direction of the roller body and fits the insulating profile.

3. The insulation coating method for an overhead high-voltage electric wire according to any one of claims 1 to 2, characterized in that: In S2, the overlapping joints of the insulating profiles are bonded by hot pressing.

4. The insulation coating method for overhead high-voltage electric wires according to any one of claims 1 to 2, characterized in that: The length direction of the insulating profile is the same as the extension direction of the high-voltage wire, and the length of the insulating profile is greater than or equal to 50m.

5. The insulation coating method for overhead high-voltage electric wires according to claim 4, characterized in that: The thickness of the insulating profile is 1.5 mm to 3.5 mm.

6. The insulation coating method for overhead high-voltage electric wires according to any one of claims 1 to 2, characterized in that: In S2, the material of the insulating profile includes rubber, the pressure value used for hot pressing is 1kg~5kg, and the temperature used is 140°C~220°C.

7. The insulation coating method for overhead high-voltage electric wires according to any one of claims 1 to 2, characterized in that: In S3, the material of the insulating profile includes rubber, the pressure value used in hot pressing is 1kg~5kg, and the temperature used is 140°C~220°C.

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