A copper conductor for a salt spray-resistant and moisture-resistant offshore wind power cable and its preparation process

Abstract

The present invention relates to the technical field of cables, and discloses a copper conductor for a salt spray-resistant and moisture-resistant offshore wind power cable, including a rubber outer cable sheath. In the present invention, the first core layer is made of sulfate compounds, such as copper sulfate, which is usually used to form a protective oxide film to prevent the oxidation of copper materials. The content of sulfates is between 1% and 10%. The second core layer is made of organic amine compounds, such as ethylenediamine, which is commonly used as a corrosion inhibitor to slow down the corrosion rate of copper. The content of organic amine compounds is between 0.5% and 5%. The third core layer is made of phosphate compounds, such as copper phosphate, which can be used as an anti-rust agent to form a protective oxide film. The content of phosphate compounds is between 0.1% and 2%. The fourth core layer is made of preservatives and surfactants, which are used to improve the adhesion and corrosion resistance of the coating. The content of the mixed components is between 0.1% and 1%, which can improve the salt spray resistance and moisture resistance of the cable copper conductor in a salt spray environment.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to a copper conductor for a salt - fog - resistant and moisture - resistant offshore wind power cable and its preparation process. Background Art

[0002] Humid air poses great harm to power cables. Cables laid near fish ponds, coastal areas, and tidal flats are surrounded by humid air. Due to the salt - fog and high - humidity environment, it has a very serious impact on the normal operation of power cables. In the process of salt - fog corrosion damage, chloride ions play a major role. Chloride ions are easy to penetrate the protective coating on the surface of the corroded cable, and then undergo an electrochemical reaction with the internal metal. At the same time, chloride ions contain a certain amount of hydration energy and are easily adsorbed in the pores and cracks on the surface of the coating, displacing and replacing oxygen in the protective layer, turning insoluble oxides into soluble chlorides, and further causing corrosion. After long - term use of ordinary cables in a salt - fog environment, serious aging, corrosion, and damage will occur on the surface of the cables, which will then cause line failures, bringing greater impacts to people's normal production and life, and also causing greater losses to the power department. Therefore, it is necessary to provide a copper conductor for a salt - fog - resistant and moisture - resistant offshore wind power cable and its preparation process. Summary of the Invention

[0003] The purpose of the present invention is to provide a copper conductor for a salt - fog - resistant and moisture - resistant offshore wind power cable and its preparation process to solve the problems raised in the above - mentioned background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A copper conductor for a salt - fog - resistant and moisture - resistant offshore wind power cable includes a rubber outer cable sheath, and an outer - perimeter copper core body, a main copper core body, and a secondary copper core body wrapped inside the rubber outer cable sheath. The outer - perimeter copper core body is provided with two circles and is distributed inside the rubber outer cable sheath. The main copper core body is provided with one and is arranged at the central position inside the rubber outer cable sheath. The secondary copper core bodies are circumferentially distributed outside the main copper core body. The outer - perimeter copper core body, the main copper core body, and the secondary copper core body form a cable copper conductor, and a protective - performance process - layer structure is arranged between the cable copper conductor and the rubber outer cable sheath.

[0005] Preferably, the protective - performance process - layer structure specifically includes a crack - resistant stretching layer, an elastic and easily - recoverable anti - twisting layer, a waterproof and pressure - resistant layer, a fire - and high - temperature - resistant layer, and an inner - skin insulation layer. The inner wall surface of the rubber outer cable sheath is arranged in contact with the outer wall of the crack - resistant stretching layer. The inner wall surface of the crack - resistant stretching layer is arranged in contact with the outer wall of the elastic and easily - recoverable anti - twisting layer. The inner wall surface of the elastic and easily - recoverable anti - twisting layer is arranged in contact with the outer wall of the waterproof and pressure - resistant layer. The inner wall surface of the waterproof and pressure - resistant layer is arranged in contact with the outer wall of the fire - and high - temperature - resistant layer. Reinforcing ribs are circumferentially and equidistantly arranged between the fire - and high - temperature - resistant layer and the inner - skin insulation layer, and a filling layer is arranged inside the inner - skin insulation layer.

[0006] Preferably, the crack-resistant tensile layer is made of TPU material, the elastic and easily recoverable anti-twist layer is made of elastic rubber material, the waterproof and pressure-resistant layer is made of polyethylene material, the fireproof and high-temperature resistant layer is made of silicone rubber filled with polytetrafluoroethylene fine powder, the inner endothelial insulation layer is made of insulating silicone rubber, the reinforcing rib is made of ceramic fiber material, and the filling layer is made of polypropylene fiber material.

[0007] Preferably, the cable copper conductor composed of the peripheral copper core, the main copper core, and the secondary copper core is distributed on the filling layer.

[0008] Preferably, the specific structure of the cable copper conductor composed of the peripheral copper core, the main copper core, and the secondary copper core includes a copper core.

[0009] Preferably, a first core layer is provided on the outer wall of the copper core, a second core layer is provided on the outer wall of the first core layer, a third core layer is provided on the outer wall of the second core layer, and a fourth core layer is provided on the outer wall of the third core layer.

[0010] Preferably, the first core layer is made of sulfate compounds such as copper sulfate, the second core layer is made of organic amine compounds such as ethylenediamine, the third core layer is made of phosphate compounds such as copper phosphate, and the fourth core layer is made of preservatives and surfactants.

[0011] Another technical problem to be solved by the present invention is to provide a preparation process for a copper conductor of a marine wind power cable resistant to salt spray and moisture, including the preparation of copper materials, the single-wire drawing process, the wire core stranding process, the stranding annealing treatment process, and the insulation wrapping process. The specific method steps are as follows:

[0012] Step 1: Preparation of copper materials. Sulfate compounds such as copper sulfate are sequentially added to the outer surface of the copper materials, with the content of sulfates between 1% and 10%, organic amine compounds such as ethylenediamine, with the content of organic amine compounds between 0.5% and 5%, phosphate compounds such as copper phosphate, which can be used as rust inhibitors, with the content of phosphate compounds between 0.1% and 2%, and a mixture of preservatives and surfactants, with the content of the mixed components between 0.1% and 1%.

[0013] Step 2: Single-wire drawing process. A wire drawing machine set is used to draw the copper conductor material into single wires. The copper conductor material is used as the wire feed, and the copper single wires are drawn through a wire drawing machine set with a round core.

[0014] Step 3: Core stranding process. According to requirements, several copper single wires obtained through Step 2 are arranged around the round core wire by a winding machine and stranded into a wire blank, with the arc surfaces of the single wires facing the round core wire. Then, the single wires are pre-twisted so that the single wires rotate around their own wire axes, ensuring that the small arc surfaces of the single wires face the core wire. Finally, each single wire and the core wire converge at the forming and bunching die and are stranded to form a copper wire blank;

[0015] Step 4: Stranded wire annealing treatment process. The wire blank is placed in an annealing furnace and heated to 300 - 330°C ± 10°C, and the holding time is 6 - 10 hours. Then, it is left to stand and naturally cool to room temperature to become a copper wire;

[0016] Step 5: Insulation wrapping process. An inner skin insulation layer is wrapped around the outside of the copper wire obtained in Step 4, and a filling layer is provided in the gap between the inner skin insulation layer and the copper wire.

[0017] Preferably, in Step 3, the rotation angle of the single wire around its own wire axis is 180° - 360°, and the pre-twisting direction is opposite to the stranding rotation direction.

[0018] Preferably, in Step 4, specifically, the wire blank is placed in a preheated annealing furnace and heated to 310 - 330°C ± 10°C and held for 2 - 3 hours, then heated to 340 - 370°C ± 10°C and held for 2 hours. Then, the wire blank after the temperature rise is cooled at a cooling rate of 12 - 20°C per 0.1 hour to a temperature of 250 - 270°C ± 10°C and held for 2 - 3 hours. Finally, the wire blank is taken out of the annealing furnace and left to stand and naturally cool to room temperature to obtain a copper wire.

[0019] The present invention provides a copper conductor for a salt - spray - resistant and moisture - resistant offshore wind power cable and its preparation process. It has the following beneficial effects:

[0020] (1). By designing a salt - spray - resistant and moisture - resistant cable copper conductor, the cable copper conductor is mainly made of a copper core 311. The outer wall of the copper core 311 is sequentially provided with a first core layer 312, a second core layer 313, a third core layer 314, and a fourth core layer 315. And by designing a salt - spray environment and conducting corrosion resistance tests on the cable copper conductor, the cable copper conductor can be prepared quickly and effectively.

[0021] (2) In the present invention, the first core layer is made of sulfate compounds, such as copper sulfate, which is usually used to form a protective oxide film to prevent the oxidation of copper materials. The content of sulfate is between 1% and 10%. The second core layer is made of organic amine compounds, such as ethylenediamine, which is commonly used as a corrosion inhibitor to slow down the corrosion rate of copper. The content of organic amine compounds is between 0.5% and 5%. The third core layer is made of phosphate compounds, such as copper phosphate, which can be used as a rust inhibitor to form a protective oxide film. The content of phosphate compounds is between 0.1% and 2%. The fourth core layer is made of preservatives and surfactants, which are used to improve the adhesion and corrosion resistance of the coating. The content of the mixed components is between 0.1% and 1%, which can improve the salt spray and moisture resistance of the copper conductor of the cable in a salt spray environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a structural view of the protective performance process layer of the present invention;

[0024] Figure 3 is a structural view of the copper core of the present invention.

[0025] In the figure: 111 rubber outer cable sheath, 112 peripheral copper conductor core, 113 main copper conductor core, 114 auxiliary copper conductor core, 2 protective performance process layer structure, 211 crack-resistant tensile layer, 212 elastic and easily recoverable anti-twist layer, 213 waterproof and pressure-resistant layer, 214 fireproof and high-temperature-resistant layer, 215 inner skin insulation layer, 216 reinforcing rib, 217 filling layer, 311 copper core, 312 first core layer, 313 second core layer, 314 third core layer, 315 fourth core layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] Example 1

[0029] A preferred embodiment of the copper conductor of a salt spray and moisture resistant offshore wind power cable provided by the present invention is as followsFigures 1-3 As shown in the figure: A copper conductor for a salt - fog - resistant and moisture - resistant offshore wind power cable, including a rubber outer cable sheath 111, and a peripheral copper core body 112, a main copper core body 113, and a secondary copper core body 114 wrapped inside the rubber outer cable sheath 111. The peripheral copper core body 112 is provided with two circles and is distributed inside the rubber outer cable sheath 111. The main copper core body 113 is provided with one, which is arranged at the central position inside the rubber outer cable sheath 111. The secondary copper core body 114 is circumferentially distributed outside the main copper core body 113. The peripheral copper core body 112, the main copper core body 113, and the secondary copper core body 114 form the cable copper conductor, and a protective performance process layer structure 2 is arranged between the cable copper conductor and the rubber outer cable sheath 111;

[0030] The protective performance process layer structure 2 specifically includes a crack - resistant tensile layer 211, an elastic and easily recoverable anti - twist layer 212, a waterproof and pressure - resistant layer 213, a fire - resistant and high - temperature - resistant layer 214, and an inner endothelial insulation layer 215. The inner wall surface of the rubber outer cable sheath 111 is arranged opposite to the outer wall of the crack - resistant tensile layer 211. The inner wall surface of the crack - resistant tensile layer 211 is arranged opposite to the outer wall of the elastic and easily recoverable anti - twist layer 212. The inner wall surface of the elastic and easily recoverable anti - twist layer 212 is arranged opposite to the outer wall of the waterproof and pressure - resistant layer 213. The inner wall surface of the waterproof and pressure - resistant layer 213 is arranged opposite to the outer wall of the fire - resistant and high - temperature - resistant layer 214. Reinforcing ribs 216 are arranged at equal circumferential distances between the fire - resistant and high - temperature - resistant layer 214 and the inner endothelial insulation layer 215. A filling layer 217 is arranged inside the inner endothelial insulation layer 215;

[0031] The crack - resistant tensile layer 211 is made of TPU material and has anti - tensile performance, which can extend the service life. The elastic and easily recoverable anti - twist layer 212 is made of elastic rubber material, which can buffer the twisting force and reduce the bending force on the cable when the cable is bent and twisted by external forces. The waterproof and pressure - resistant layer 213 is made of polyethylene material. The fire - resistant and high - temperature - resistant layer 214 is made of a silicone rubber material filled with polytetrafluoroethylene fine powder. The polytetrafluoroethylene therein is obtained by irradiation cracking and then ultra - fine air - flow pulverization. At a certain flame temperature, it can still ensure that the circuit is normally powered on for a certain period of time and has excellent high - temperature and fire - resistant performance. The inner endothelial insulation layer 215 is made of insulating silicone rubber. The reinforcing ribs 216 are made of ceramic fiber material to improve the strength of the cable under radial pressure, enhance the integrated strength of the cable, and strengthen the overall stability of the cable. The filling layer 217 is made of polypropylene fiber material;

[0032] The cable copper conductor composed of the peripheral copper core body 112, the main copper core body 113, and the secondary copper core body 114 is distributed on the filling layer 217;

[0033] The specific structure of the cable copper conductor composed of the peripheral copper conductor core 112, the main copper conductor core 113, and the auxiliary copper conductor core 114 includes a copper core 311. The outer wall of the copper core 311 is provided with a first core layer 312. The outer wall of the first core layer 312 is provided with a second core layer 313. The outer wall of the second core layer 313 is provided with a third core layer 314. The outer wall of the third core layer 314 is provided with a fourth core layer 315. The first core layer 312 is made of sulfate compounds such as copper sulfate, which is usually used to form a protective oxide film to prevent the oxidation of copper materials. The content of the sulfate is between 1% and 10%. The second core layer 313 is made of organic amine compounds such as ethylenediamine, which is commonly used as a corrosion inhibitor to slow down the corrosion rate of copper. The content of the organic amine compounds is between 0.5% and 5%. The third core layer 314 is made of phosphate compounds such as copper phosphate, which can be used as an anti-rust agent to form a protective oxide film. The content of the phosphate compounds is between 0.1% and 2%. The fourth core layer 315 is made of preservatives and surfactants, which are used to improve the adhesion and corrosion resistance of the coating. The content of the mixed components is between 0.1% and 1%.

[0034] Example 2

[0035] Please refer to Figures 1-3 and, on the basis of Example 1, further obtain: Another technical problem to be solved by the present invention is to provide a preparation process for the copper conductor of a salt spray-resistant and moisture-resistant offshore wind power cable, including the preparation of copper materials, the single-wire drawing process, the wire core stranding process, the strand annealing treatment process, and the insulation wrapping process. The specific method steps are as follows:

[0036] Step 1: Preparation of copper materials. On the outer surface of the copper materials, add in sequence sulfate compounds such as copper sulfate, with the content of the sulfate between 1% and 10%, organic amine compounds such as ethylenediamine, with the content of the organic amine compounds between 0.5% and 5%, phosphate compounds such as copper phosphate, which can be used as an anti-rust agent, with the content of the phosphate compounds between 0.1% and 2%, and a mixture of preservatives and surfactants, with the content of the mixed components between 0.1% and 1%.

[0037] Step 2: Single-wire drawing process. Use a wire drawing machine set to draw the copper conductor material into single wires. Take the copper conductor material as the wire feed and draw it into copper single wires through a wire drawing machine set with a round core.

[0038] Step 3: Wire core stranding process. According to requirements, use a winding machine to arrange and strand several copper single wires obtained from Step 2 around a round core wire to form a wire blank, with the arc surfaces of the single wires facing the round core wire. Then, pre-twist the single wires. The single wires rotate around their own wire axes by an angle of 180° to 360°. The pre-twist direction is opposite to the rotation direction of the stranded wire, ensuring that the small arc surfaces of the single wires face the core wire. Finally, the single wires and the core wire converge at the forming and merging die to form a copper wire blank.

[0039] Step 4: Stranding annealing process. Put the wire blank into an annealing furnace and heat it up to 300 - 330°C ± 10°C, keep it for 6 - 10 hours, and then let it stand and cool naturally to room temperature to become copper wire. Specifically, put the wire blank into a preheated annealing furnace, heat it up to 310 - 330°C ± 10°C and keep it for 2 - 3 hours, then heat it up to 340 - 370°C ± 10°C and keep it for 2 hours. Then, cool the wire blank that has completed heating at a cooling rate of 12 - 20°C per 0.1 hour until it is kept at a temperature of 250 - 270°C ± 10°C for 2 - 3 hours. Finally, take out the wire blank from the annealing furnace and let it stand and cool naturally to room temperature to obtain copper wire.

[0040] Step 5: Insulation wrapping process. Wrap an inner skin insulation layer 215 outside the copper wire obtained in Step 4, and set a filling layer 217 in the gap between the inner skin insulation layer 215 and the copper wire.

[0041] Experimental Example 3

[0042] Salt spray treatment is a method for testing the corrosion resistance of materials or coatings in a salt spray environment. The treatment steps include the following:

[0043] ① Prepare salt spray test equipment: First, prepare salt spray test equipment - a fog test chamber. Ensure that the equipment is running normally and calibrate parameters such as temperature, humidity, and brine concentration.

[0044] ② Prepare samples: Make the materials or coatings to be tested into appropriate samples. Ensure that the sample surfaces are clean and free of any dirt or oxides.

[0045] ③ Place samples: Place the samples in the salt spray test chamber, ensuring there is a certain distance between the samples to avoid mutual influence.

[0046] ④ Start the test: Start the salt spray test equipment and set parameters such as test time and temperature. Usually, the test time ranges from several hours to hundreds of hours.

[0047] ⑤ Observe the samples: Regularly observe the surface conditions of the samples and record any corrosion or damage phenomena. A microscope or other test equipment can be used to check for subtle changes in the samples.

[0048] ⑥ Result analysis: Analyze the salt spray resistance of the samples based on the test results and evaluate the quality and durability of the materials or coatings.

[0049] Through the above steps, the corrosion resistance of materials or coatings in a salt spray environment can be effectively evaluated, thus guiding the product design and manufacturing process.

[0050] Judgment criteria:

[0051] Comparative Parameters of the Corrosion Resistance of High-Purity Tin and Copper in a Salt Spray Environment

[0052] Experimental Conditions:

[0053] Salt Spray Test Standard: ASTM B117

[0054] Test Time: 240 hours

[0055] Test Temperature: 35°C

[0056] Brine Concentration: 5% NaCl Solution

[0057] ① Corrosion Rate: The salt spray test can measure the corrosion rate of copper and tin in a salt spray environment, which is the speed at which the metal surface is corroded. The faster the corrosion rate, the poorer the corrosion resistance of the metal. The corrosion rate of the copper specimen in the salt spray environment is 0.2 mm / year. The corrosion rate of the tin specimen in the salt spray environment is 0.1 mm / year.

[0058] ② Corrosion Products: The salt spray test can analyze the corrosion products generated by copper and tin in a salt spray environment, including oxides, chlorides, etc. These corrosion products will affect the appearance and performance of the metal surface. Oxides and chlorides are produced on the copper surface, and the initial corrosion products are unevenly distributed, showing a scattered distribution. Oxides and chlorides are also produced on the tin surface, but the corrosion products are evenly distributed.

[0059] ③ Corrosion Morphology: The salt spray test can observe the corrosion morphology of copper and tin in a salt spray environment, including corrosion uniformity, corrosion degree, etc. Different corrosion morphologies can reflect the corrosion resistance of the metal. The surfaces of copper and tin show a uniform corrosion morphology, without obvious corrosion points or corrosion marks.

[0060] ④ Corrosion Resistance: According to the results of the salt spray test, evaluate the corrosion resistance of copper and tin in a salt spray environment, that is, how long the metal can remain uncorroded in a salt spray environment. The tin specimen shows better corrosion resistance than copper in the salt spray test. Green rust spots appear on the copper after 168 h in the salt spray environment, and green rust spots appear on the tin after 552 h in the salt spray environment.

[0061] In summary, a special antioxidant can provide the component ratio.

[0062] Sulfate Compounds (Copper Sulfate): Usually used to form a protective oxide film to prevent the oxidation of copper materials. The content of sulfate is between 1% and 10%.

[0063] Organic Amine Compounds (Ethylenediamine): Commonly used as corrosion inhibitors to slow down the corrosion rate of copper. The content of organic amine compounds is between 0.5% and 5%.

[0064] Phosphate compounds (copper phosphate): can be used as a rust inhibitor to form a protective oxide film. The content of phosphate compounds is between 0.1% and 2%.

[0065] Preservatives and surfactants: used to improve the adhesion and corrosion resistance of the coating. The content of these components is between 0.1% and 1%.

[0066] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation process for a copper conductor of a salt spray-resistant and moisture-resistant offshore wind power cable, characterized in that, The specific method steps of the preparation process are as follows: Step 1: Preparation of copper material. Sulfate compounds are sequentially added to the outer surface of the copper material, with the sulfate content ranging from 1% to 10%; organic amine compounds are added, with the content of organic amine compounds ranging from 0.5% to 5%; phosphate compounds are added and used as rust inhibitors, with the content of phosphate compounds ranging from 0.1% to 2%; a mixture of preservatives and surfactants, with the content of the mixed components ranging from 0.1% to 1%. Step 2: Single-wire drawing process. A wire drawing machine set is used to draw the copper conductor material into a single wire. The copper conductor material is used as the wire feed, and is drawn into a copper single wire through a wire drawing machine set with a round core. Step 3: Core stranding process. According to requirements, several copper single wires obtained from Step 2 are arranged around the round core wire and stranded into a wire blank through a winding machine, with the arc surfaces of the single wires facing the round core wire. Then, the single wires are pre-twisted to make the single wires rotate around their own wire axes, ensuring that the small arc surfaces of the single wires face the core wire. Finally, the single wires and the core wire converge at the forming and parallel wire die, and are stranded to form a copper wire blank. Step 4: Stranded wire annealing treatment process. The wire blank is placed in an annealing furnace and heated to 300 - 330°C ± 10°C, and the holding time is 6 - 10 hours. Then, it is left to stand and naturally cooled to room temperature to become a copper wire. Step 5: Insulation wrapping process. An inner skin insulation layer is wrapped around the outside of the copper wire obtained in Step 4, and a filling layer is provided in the gap between the inner skin insulation layer and the copper wire. The prepared copper conductor of the salt spray and moisture resistant offshore wind power cable includes a rubber outer cable sheath, an outer peripheral copper core body, a main copper core body, and a secondary copper core body wrapped inside the rubber outer cable sheath. There are two circles of outer peripheral copper core bodies, which are distributed inside the rubber outer cable sheath. There is one main copper core body, which is arranged at the central position inside the rubber outer cable sheath. The secondary copper core bodies are circumferentially distributed outside the main copper core body. The outer peripheral copper core body, the main copper core body, and the secondary copper core body form the cable copper conductor, and there is a protective performance process layer structure between the cable copper conductor and the rubber outer cable sheath. The protective performance process layer structure specifically includes a crack-resistant tensile layer, an elastic and easily recoverable anti-twist layer, a waterproof and pressure-resistant layer, a fireproof and high-temperature-resistant layer, and an inner skin insulation layer. The inner wall surface of the rubber outer cable sheath is arranged opposite to the outer wall of the crack-resistant tensile layer. The inner wall surface of the crack-resistant tensile layer is arranged opposite to the outer wall of the elastic and easily recoverable anti-twist layer. The inner wall surface of the elastic and easily recoverable anti-twist layer is arranged opposite to the outer wall of the waterproof and pressure-resistant layer. The inner wall surface of the waterproof and pressure-resistant layer is arranged opposite to the outer wall of the fireproof and high-temperature-resistant layer. Reinforcing ribs are circumferentially and equidistantly arranged between the fireproof and high-temperature-resistant layer and the inner skin insulation layer, and a filling layer is arranged inside the inner skin insulation layer. The specific structure of the cable copper conductor composed of the outer peripheral copper core body, the main copper core body, and the secondary copper core body specifically includes a copper core. A core layer 1 is arranged on the outer wall of the copper core. A core layer 2 is arranged on the outer wall of the core layer 1. A core layer 3 is arranged on the outer wall of the core layer 2. A core layer 4 is arranged on the outer wall of the core layer 3. Core layer 1 is made of sulfate compounds. Core layer 2 is made of organic amine compounds. Core layer 3 is made of phosphate compounds. Core layer 4 is made of preservatives and surfactants.

2. The preparation process according to claim 1, characterized in that: The crack-resistant tensile layer is made of TPU material, the elastic and easily recoverable anti-twist layer is made of elastic rubber material, the waterproof and pressure-resistant layer is made of polyethylene material, the fireproof and high-temperature-resistant layer is made of silicone rubber material filled with polytetrafluoroethylene fine powder, the inner endothelial insulation layer is made of insulating silicone rubber, the reinforcing rib is made of ceramic fiber material, and the filling layer is made of polypropylene fiber material.

3. The preparation process according to claim 1, characterized in that: The cable copper conductor composed of the peripheral copper core body, the main copper core body, and the secondary copper core body is distributed on the filling layer.

4. According to the preparation process described in claim 1, characterized in that: In step three, the single wire rotates around its own spool by an angle of 180° to 360°, and the pre-twisting direction is opposite to the twisting direction of the stranded wire.

5. The preparation process according to claim 1, characterized in that: Specifically in step four, the wire blank is placed in a preheated annealing furnace, heated to 310 - 330°C ± 10°C and maintained for 2 - 3 hours, then heated to 340 - 370°C ± 10°C and maintained for 2 hours. Then, the wire blank after heating is cooled at a rate of 12 - 20°C per 0.1 hour to a temperature of 250 - 270°C ± 10°C and maintained for 2 - 3 hours. Finally, the wire blank is taken out of the annealing furnace and allowed to stand and cool naturally to room temperature to obtain the copper wire.

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