Tower drum type photo-thermal heliostat motor cable and preparation method thereof

Abstract

The invention relates to the technical field of cables, in particular to a tower drum type photo-thermal heliostat motor cable and a preparation method thereof. The motor cable comprises a conductor, an insulating layer, a filling layer, a wrapping layer, a lining layer, an armor layer and an outer protection layer which are sequentially arranged from inside to outside. A reinforcing element layer is arranged between the wrapping layer and the lining layer, the reinforcing element layer is formed by winding copper foil wires, and each copper foil wire comprises a synthetic fiber at the core part and a copper strip located at the outer layer of the synthetic fiber. The reliability and the safety of the motor cable of the photo-thermal power generation system are improved, the service life of the cable is prolonged, and therefore the efficiency and the stability of the whole photo-thermal power generation system are improved.

Description

Technical Field

[0001] The present invention relates to the field of cable technology, and in particular to a tower-type solar thermal heliostat motor cable and a preparation method thereof. Background Art

[0002] In the field of renewable energy, solar thermal power generation technology has attracted widespread attention because of its ability to achieve large-scale electricity production. In a solar thermal power generation system, heliostats are one of the key components, which concentrate heat by reflecting sunlight to drive power generation equipment. The precise tracking and adjustment of heliostats depends on the stable operation of the motor, and the normal operation of the motor is inseparable from the reliable transmission of cables. Therefore, motor cables play a vital role in solar thermal power generation systems.

[0003] Existing solar thermal heliostat motor cables are usually composed of basic parts such as conductors, insulation layers, and sheath layers. These cables are designed mainly to consider the stability of power transmission, but the anti-bending performance for long-term use in harsh outdoor environments is not considered enough. Since the solar thermal heliostat needs to rotate continuously during operation, the cable also rotates with the solar thermal heliostat motor, with a maximum round-trip angle of 180°, and rotates up and down, left and right. If the cable does not have excellent anti-bending performance, when it is subjected to continuous and repeated bending, the insulation and sheath of the cable will be damaged. In severe cases, the conductive core of the cable will be broken, resulting in a reduced cable life or unusable. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the present invention is to provide a tower-type solar thermal heliostat motor cable to solve the problem that the cable insulation and sheath materials are damaged when conventional cables are repeatedly bent and twisted, thereby reducing the cable life. The cable not only has good wear resistance, cold resistance, aging resistance and UV resistance, but also can effectively prevent the gnawing of small animals such as rats and ants, ensuring the long-term stable operation of the cable. At the same time, the cable fully considers environmental protection requirements in material selection, will not cause harm to the environment, and meets strict environmental requirements. The reliability and safety of the motor cable of the solar thermal power generation system are improved, and the service life of the cable is extended, thereby improving the efficiency and stability of the entire solar thermal power generation system.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A tower-type solar thermal heliostat motor cable comprises a conductor, an insulating layer, a filling layer, a wrapping layer, an inner lining layer, an armor layer and an outer protective layer which are arranged in sequence from the inside to the outside; a reinforcing element layer is arranged between the wrapping layer and the inner lining layer, and the reinforcing element layer is wound with copper foil wire, and the copper foil wire comprises a synthetic fiber in the core and a copper tape located on the outer layer of the synthetic fiber.

[0007] Optionally, the conductor is formed by twisting a plurality of copper wires.

[0008] Optionally, the insulating layer is made of PVC insulating material, and an anti-ultraviolet agent and anti-rat and ant bitter essence particles are added to the insulating layer.

[0009] Optionally, the insulating layer and the conductor constitute an insulating wire core, and there are at least two insulating wire cores. The gaps between the insulating wire cores are filled with a polypropylene mesh tear film to form a filling layer.

[0010] Optionally, the wrapping layer is formed by wrapping a non-woven fabric.

[0011] Optionally, the inner lining layer is formed by extruding a cross-linked polyethylene insulating material.

[0012] Optionally, the armor layer is formed by wrapping a galvanized steel strip.

[0013] Optionally, the outer protective layer is extruded from a thermoplastic polyurethane elastomer, and an anti-ultraviolet agent is added to the outer protective layer, and the anti-ultraviolet agent includes a shielding agent and a shielding agent.

[0014] The embodiment of the present invention further provides a method for preparing the tower-type solar thermal heliostat motor cable as described above, comprising:

[0015] Tinned soft copper wires are twisted into conductors;

[0016] Extruding PVC insulation material on the conductor to form an insulation layer, and adding UV protection agent and rat and ant-proof bitter essence particles to the insulation layer;

[0017] The insulating layer and the conductor constitute an insulating wire core, and the gap between the insulating wire cores is filled with a non-hygroscopic material to form a filling layer;

[0018] Wrapping non-woven fabric around the outer periphery of the insulating layer and the filling layer to form a wrapping layer;

[0019] Copper foil is wound around the wrapping layer to form a reinforcement element layer;

[0020] Extruding a cross-linked polyethylene insulation material outside the reinforcement element layer to form an inner lining layer;

[0021] Wrap galvanized steel strip around the inner lining to form an armor layer;

[0022] A thermoplastic polyurethane elastic sheath is extruded outside the armor layer, and UV protection agent and anti-rat and ant bitter essence particles are added to the sheath material. The UV protection agent includes a shielding agent and an absorbent. The shielding agent is a carbon black material, and the absorbent is a benzophenone or benzotriazole compound to form an outer protective layer.

[0023] Optionally, before preparing the outer protective layer, a drying tunnel is provided for preheating the cable core coated with the armor layer before entering the extruder to eliminate the internal stress existing in the cable core.

[0024] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] 1. The present invention adopts a process innovation of filling and adding high-strength fiber reinforcement elements. The reinforcement element is composed of copper foil wire for sparse winding shielding, and the copper foil wire structure is formed by aramid wire wrapped with copper tape. During the use of the cable, this layer can provide additional support for the inner lining layer, improve the bending and twisting resistance of the cable, and ensure that the bending resistance of the cable meets the long-term rotation of the photothermal heliostat. After the bending / twisting resistance test, the cable can pass the twisting / bending test 20,000 times. In addition, the synthetic fiber as the inner core gives the reinforcement element layer good mechanical strength and flexibility, can absorb external impact to a certain extent, and reduce the direct pressure on the inner lining. The metallic properties of the copper tape also help to improve the corrosion resistance of the cable, ensuring that the cable can still maintain good performance in a humid or corrosive environment. This design significantly enhances the overall performance and durability of the tower-type photothermal heliostat motor cable, ensuring its stability and safety in long-term use.

[0026] 2. The present invention has made an innovation in setting up a drying tunnel for preheating. Since the elastomeric material is sensitive to temperature changes, before the sheath is produced, a drying tunnel for preheating is set before the cable core enters the extruder to eliminate the internal stress in the cable core, ensuring that the cable sheath will not shrink significantly after a period of use. High and low temperature cycle tests are designed to verify the performance of the cable under alternating working environment temperatures, so as to achieve better quality and more reliability on the original basis. Ultraviolet resistance, that is, the cable sheath can pass the artificial xenon lamp aging test. After 720 hours, the sheath has a breaking elongation of -3%, and the strength change rate is -15%. Compared with the national standard of ±30%, the performance is greatly improved.

[0027] 3. The present invention adopts soft cold-resistant PVC insulation material for the insulation layer, so that the cable has good cold resistance and aging resistance. At the same time, environmentally friendly rat and ant-proof bitter essence particles are added, so the cable has good rat and termite-proof performance.

[0028] 4. The wrapping layer of the present invention uses white light non-woven fabric to ensure that the cable core is tight and not loose, and at the same time the density is low, which can effectively reduce the weight of the cable itself and reduce the load on the cable.

[0029] 5. The inner lining layer of the present invention is a cross-linked polyethylene isolation layer. The cross-linked polyethylene uses high-density polyethylene as the main raw material, which increases the heat resistance, creep resistance, tear resistance, notch cracking resistance, flame retardancy and other properties of the wire and cable, and at the same time has excellent environmental protection properties.

[0030] 6. The armor layer of the present invention adopts galvanized steel strip, which has good wear resistance, impact resistance, corrosion resistance and heat insulation and flame retardant properties.

[0031] 7. The outer sheath layer of the present invention uses an environmentally friendly flame-retardant TPU sheath. The sunlight radiation in the operating environment of the heliostat motor cable exceeds 6000MJ·m-2, and the cable must have reliable ozone resistance and UV resistance. By improving the conventional sheath and adding an anti-ultraviolet agent, carbon black materials can be used as shielding agents, benzophenones, benzotriazole compounds, etc. can be used as absorption materials, and innovatively adding an anti-ultraviolet agent to the sheath to form a sheath material with excellent ultraviolet tolerance, avoiding the sheath material from being damaged by long-term high-intensity ultraviolet rays and causing aging, so that the sheath material has a higher ultraviolet tolerance. At the same time, it will not affect the environment.

[0032] 8. The outer sheath layer of the present invention uses an environmentally friendly flame-retardant TPU sheath, and innovatively adds environmentally friendly anti-rat and ant bitter essence particles to the sheath material, which can effectively prevent line short circuit or open circuit problems caused by rat and ant gnawing, and has high environmental protection performance and will not cause harm to the environment.

[0033] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0035] Figure 1 is a schematic diagram of a motor cable provided in an embodiment of the present invention;

[0036] In the figure: 1. Conductor; 2. Insulation layer; 3. Filling layer; 4. Wrapping layer; 5. Reinforcement element layer; 6. Lining layer; 7. Armor layer; 8. Outer protective layer. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Example 1

[0039] In order to solve the technical problems mentioned in the background technology, this embodiment proposes a tower-type solar thermal heliostat motor cable, which has good resistance to high and low temperature conversion and ultraviolet radiation, and at the same time has high wear resistance and low temperature torsion resistance, rat and termite resistance and other characteristics, and is an environmentally friendly rat and termite-proof tower-type solar thermal heliostat motor cable.

[0040] like Figure 1 As shown in the figure, a structure of a tower-type solar thermal heliostat motor cable includes multiple layers of components, including copper conductor 1, insulation layer 2, filling layer 3, wrapping layer 4, inner lining layer 6, armor layer 7 and outer protective layer 8 from the inside to the outside. This layered structure not only improves the electrical performance of the cable, but also enhances its mechanical strength and environmental resistance. The conductor 1 is the core part of the cable, and the insulation layer 2 from the inside to the outside provides electrical isolation to prevent short circuit. The presence of the filling layer 3 helps to maintain the shape stability of the cable and also reduces the impact of external stress on the internal conductor 1. The wrapping layer 4 provides additional physical protection by coating the filling layer 3, further improving the durability of the cable. The setting of the inner lining layer 6 enhances the insulation performance of the cable in extreme environments, while the armor layer 7 provides mechanical protection to resist external impact. Finally, the outer protective layer 8 provides waterproof and weather resistance through the characteristics of thermoplastic polyurethane elastomer.

[0041] The reinforcing element layer 5 is located between the wrapping layer 4 and the inner lining layer 6. The reinforcing element is composed of copper foil wire for sparse winding shielding, and the copper foil wire structure is formed by aramid wire wrapped with copper tape. The structure of the copper foil wire includes two main parts: the synthetic fiber of the core and the copper tape coated on the outer layer of the synthetic fiber. First, the synthetic fiber serves as the inner core, which gives the reinforcing element layer 5 good mechanical strength and flexibility, can absorb external impact to a certain extent, and reduce the direct pressure on the inner lining layer 6. Secondly, the copper tape coating increases the conductivity of the reinforcing element layer 5 and improves the electrical performance of the entire cable, especially in application scenarios where electromagnetic interference needs to be shielded, it can more effectively prevent interference with internal signals of the cable. The setting of the reinforcing element layer 5 also has an important protective effect.

[0042] The conductor 1 is made of a plurality of copper wires twisted together, and has good softness and bending properties. By twisting a plurality of copper wires together, the conductivity can be effectively improved, and the flexibility and tensile strength of the conductor 1 can be increased. The twisted structure can evenly distribute the load during the use of the cable, and prevent the conductor 1 from being damaged due to excessive local stress. In addition, the twisted copper wires can enhance the corrosion resistance of the conductor 1, adapt to various environmental conditions, and ensure the long-term stable operation of the cable.

[0043] The filling material and wrapping tape should be suitable for the operating temperature of the cable and compatible with the cable insulation material. The filler should not adhere to the insulating core and sheath, and should not affect the electrical properties and combustion characteristics of the cable.

[0044] The insulation and sheath materials of existing cables are generally plastic materials. If the cable does not have anti-ultraviolet performance, when the surface is exposed to ultraviolet rays, it will accelerate the aging of the insulation and sheath, and tiny cracks (i.e., cracking) will appear, thereby destroying the insulation layer 2 and the sheath layer, causing functional failure. In addition, the operating environment of the heliostat motor cable is a high-altitude area with strong solar radiation. The cable must have reliable ozone resistance and anti-ultraviolet performance. Considering the cable laying method and specification outer diameter requirements, the cable sheath and insulation materials are designed and selected to ensure the normal operation of the product in an environment with high ultraviolet rays and long-term ozone aging.

[0045] The insulating layer 2 of the present embodiment is composed of a soft cold-resistant PVC insulating material, and is added with an anti-ultraviolet agent and rat-ant-proof bitter essence particles, which has good cold resistance and aging resistance as well as rat-proof and termite-proof performance. The PVC material has excellent electrical insulation performance and chemical stability, and is suitable for working in various temperature ranges. The added anti-ultraviolet agent can effectively prevent the aging and degradation of the insulating material under direct sunlight, and the addition of the rat-ant-proof bitter essence particles can enhance the cable's resistance to rodents and reduce cable damage caused by rodents. The insulating layer 2 designed in this way can improve the service life and safety of the cable while providing good electrical insulation.

[0046] The insulating layer 2 and the conductor 1 form an insulating core, and there are at least two insulating cores. The gap is filled with a polypropylene mesh tear film to form a filling layer 3 to ensure that the cable is round and improve the wear resistance of the cable. This design further improves the insulation performance of the cable. At the same time, the polypropylene mesh tear film of the filling layer 3 has good moisture resistance and mechanical strength, and can effectively resist moisture and external impact. The setting of two insulating cores not only enhances the electrical isolation effect of the cable, but also reduces the electromagnetic interference between the conductors 1 to a certain extent, thereby improving the performance of the overall cable.

[0047] In this embodiment, the wrapping layer 4 is formed by wrapping with white light non-woven fabric. The non-woven fabric has excellent tear resistance and abrasion resistance, and can protect the internal structure from external physical damage during the use of the cable. By wrapping with the non-woven fabric, the cable core is ensured to be tight and not loose, and the density is low, which can effectively reduce the weight of the cable.

[0048] In this embodiment, the inner lining layer 6 is formed by extruding a cross-linked polyethylene insulation material. The inner lining layer 6 should be tightly extruded on the copper foil wire of the reinforcing element layer 5, so that it can be easily peeled off without damaging the inner layer structure. The inner lining layer 6 should not adhere to the insulating wire core, the shielding layer and the armor layer 7. Cross-linked polyethylene is made of high-density polyethylene as the main raw material. Through the action of high-energy rays or chemical initiators, the linear macromolecular structure is transformed into a spatial network structure. When it is tightly extruded on a non-woven fabric, it not only increases the heat resistance, creep resistance, tear resistance, notch cracking resistance, flame retardancy and other properties of the wire and cable, but also has excellent environmental protection properties.

[0049] In this embodiment, the armor layer 7 is wrapped with galvanized steel strips, which have good wear resistance, impact resistance, corrosion resistance, and heat insulation and flame retardant properties. The use of galvanized steel strips not only improves the corrosion resistance of the armor layer 7, but also enhances the compression resistance of the cable. During construction and operation, the armor layer 7 can effectively resist external impact and pressure and protect the internal structure from damage. In addition, the galvanizing treatment can effectively prevent rust caused by moisture or chemical corrosion, and ensure the stability and reliability of the cable in various environments.

[0050] The outer protective layer 8 of this embodiment adopts an environmentally friendly flame-retardant TPU sheath, which improves the conventional sheath and adds an anti-ultraviolet agent, wherein the carbon black material can be used as a shielding agent, and benzophenone, benzotriazole compounds, etc. can be used as an absorption material. The anti-ultraviolet agent is innovatively added to the sheath to form a sheath material with excellent ultraviolet tolerance and qualified, so as to avoid the sheath material being damaged by long-term high-intensity ultraviolet rays and causing aging, so that the sheath material has a higher ultraviolet tolerance. At the same time, environmentally friendly rat-proof bitter essence particles are innovatively added to the sheath material, which can effectively prevent the line short circuit or circuit breakage caused by rat and ant biting, and has a high environmental performance and will not harm the environment.

[0051] Example 2

[0052] The preparation method of the cable in Example 1:

[0053] 1. Twist the tinned soft copper wire into conductor 1. The material, diameter and number of strands of the tinned soft copper wire shall be configured according to the design requirements.

[0054] 2. Soft cold-resistant PVC insulation material is tightly extruded on the conductor 1 to form the insulation layer 2; and a small amount of UV protection agent is added to the insulation layer 2, which does not affect the insulation performance and makes the cable as a whole have higher ozone resistance. At the same time, environmentally friendly rat and ant-proof bitter granules are added to improve the cable's rat and termite resistance.

[0055] 3. The insulating layer 2 and the conductor 1 constitute an insulating core, and the gaps between the insulating cores are filled with non-hygroscopic materials to form a filling layer 3, which ensures the roundness of the cable and improves the wear resistance of the cable during production and use.

[0056] 4. Wrap white lightweight non-woven fabric around the outer periphery of the insulating layer 2 and the filling layer 3 to form a non-hygroscopic wrapping layer 4, which helps to keep the cable dry and stable in performance, and ensures that the cable core is tight and not loose.

[0057] 5. A high-strength fiber reinforcement element layer 5 is added outside the wrapping layer 4. The reinforcement element is composed of copper foil wire for sparse winding shielding. The copper foil wire structure is made of copper tape wrapped around aramid wire, thereby improving the bending and twisting resistance of the cable, ensuring that the bending resistance of the cable meets the long-term rotation requirements of the solar thermal heliostat.

[0058] 6. Extruded inner lining layer 6. The inner lining layer 6 adopts cross-linked polyethylene insulation material, which uses high-density polyethylene as the main raw material, and increases the heat resistance, creep resistance, tear resistance, notch cracking resistance, flame retardancy and other properties of the wire and cable.

[0059] 7. Wrap the galvanized steel strip again to form an armor layer 7.

[0060] 8. Finally, extrude the environmentally friendly flame-retardant TPU sheath to form an outer protective layer 8. The conventional sheath is improved by adding an anti-ultraviolet agent, which includes a shielding agent and an absorbent, wherein carbon black material is used as a shielding agent, and benzophenone, benzotriazole compounds, etc. are used as absorbent materials. By adding an anti-ultraviolet agent to the sheath, a sheath material with excellent ultraviolet tolerance is designed to prevent the sheath material from being damaged by long-term high-intensity ultraviolet rays and causing aging, so that the sheath material has a higher ultraviolet tolerance. At the same time, environmentally friendly anti-rat and ant bitter essence particles are added to the sheath material, which can effectively prevent the line short circuit or open circuit problems caused by rat and ant biting, and has high environmental protection performance and will not cause harm to the environment.

[0061] Solar thermal power generation heliostats are generally installed in outdoor areas with abundant sunlight at high altitudes, especially in harsh environments such as the Gobi Desert. The cable operating temperature is high during the day and the temperature is very cold at night. Considering the cable laying method and operation conditions, it is necessary to ensure that the cable can operate stably in an environment with long-term high and low temperature conversion. Therefore, it is necessary to study the impact of high and low temperature cycles on cable sheaths and insulation, and ensure that the thermal shrinkage performance verification is passed through process innovation and material selection.

[0062] In order to reduce the sensitivity of the elastomeric material to temperature changes, in this embodiment, before the sheath is produced, a drying tunnel is set for preheating before the cable core coated with the armor layer 7 enters the extruder to eliminate the internal stress in the cable core and ensure that the cable sheath will not shrink significantly after a period of use.

[0063] In summary, this embodiment describes a method for preparing a motor cable, and each step of the method is intended to ensure the high performance and high quality of the cable. From the twisting of the conductor 1 to the extrusion of the insulating layer 2, each step uses materials and technologies that meet industry standards to ensure the reliability of the product. In the process of wrapping the insulating layer 2 and the filling layer 3 with non-woven fabric and copper foil, appropriate process parameters are adjusted to ensure close bonding between the layers and prevent interlayer separation caused by dynamic loads during use. Finally, in the production of the outer protective layer 8, a reasonable ratio of UV protection agents and anti-rat and ant bitter essence particles can effectively improve the cable's environmental resistance and adapt to complex and changeable conditions of use.

[0064] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A tower-type solar thermal heliostat motor cable, characterized in that: It includes the conductor, insulation layer, filling layer, wrapping layer, inner lining layer, armor layer and outer protective layer arranged from inside to outside; A reinforcing element layer is arranged between the wrapping layer and the inner lining layer. The reinforcing element layer is wound with copper foil wires. The copper foil wires include synthetic fibers in the core and copper tapes located on the outer layer of the synthetic fibers.

2. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The conductor is formed by twisting a plurality of copper wires.

3. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The insulating layer is made of PVC insulating material, and an anti-ultraviolet agent and rat and ant-proof bitter essence particles are added into the insulating layer.

4. The tower-type solar thermal heliostat motor cable according to claim 3, characterized in that: The insulating layer and the conductor constitute an insulating wire core, and there are at least two insulating wire cores. The gaps between the insulating wire cores are filled with a polypropylene mesh tear film to form a filling layer.

5. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The wrapping layer is formed by wrapping non-woven fabric.

6. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The inner lining layer is formed by extruding a cross-linked polyethylene insulating material.

7. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The armor layer is formed by wrapping a galvanized steel belt.

8. The tower-type solar thermal heliostat motor cable according to claim 1, characterized in that: The outer protective layer is formed by extruding a thermoplastic polyurethane elastomer, and an anti-ultraviolet agent is added to the outer protective layer, and the anti-ultraviolet agent includes a shielding agent and a shielding agent.

9. A method for preparing a tower-type solar thermal heliostat motor cable according to any one of claims 1 to 8, characterized in that: include: Tinned soft copper wires are twisted into conductors; Extruding PVC insulation material on the conductor to form an insulation layer, and adding UV protection agent and rat and ant-proof bitter essence particles to the insulation layer; The insulating layer and the conductor constitute an insulating wire core, and the gap between the insulating wire cores is filled with a non-hygroscopic material to form a filling layer; Wrapping non-woven fabric around the outer periphery of the insulating layer and the filling layer to form a wrapping layer; Copper foil is wound around the wrapping layer to form a reinforcement element layer; Extruding a cross-linked polyethylene insulation material outside the reinforcement element layer to form an inner lining layer; Wrap galvanized steel strip around the inner lining to form an armor layer; A thermoplastic polyurethane elastic sheath is extruded outside the armor layer, and UV protection agent and anti-rat and ant bitter essence particles are added to the sheath material. The UV protection agent includes a shielding agent and an absorbent. The shielding agent is a carbon black material, and the absorbent is a benzophenone or benzotriazole compound to form an outer protective layer.

10. The preparation method according to claim 9, characterized in that: Before preparing the outer protective layer, a drying tunnel is set for preheating the cable core coated with the armor layer before entering the extruder to eliminate the internal stress in the cable core.

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