A kind of anti-aging medium and low voltage polyvinyl chloride cable and its production method

Abstract

The present invention proposes an anti-aging medium and low voltage polyvinyl chloride cable, comprising an outer insulating layer, with sealing rubber sleeves glued to both sides of the outer insulating layer, a protective component provided on the inner wall of the outer insulating layer, the protective component comprising a separator film, a separator film provided on the inner wall of the outer insulating layer, a liquid tank reserved between the two sets of separator films, the interior of the liquid tank being filled with a sodium silicate solution, a separator sleeve provided on the inner wall of the outer insulating layer, a liquid layer embedded in the separator sleeve, and a repair component embedded in the liquid layer. When the outer insulating layer is damaged by external force, the present invention triggers the isolation of the protective layer to precisely rupture and release alumina powder and sodium silicate solution. After mixing, the two react rapidly to generate a highly insulating and high-strength aluminosilicate hardened body, thereby simultaneously achieving sealing and leak-proofing of the damaged part, structural reinforcement, and enhanced flame retardancy, and can complete self-repair without human intervention.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof. Background Art

[0002] Medium and low voltage polyvinyl chloride cables are widely used in building power distribution, industrial control, and residential lighting due to their low cost, easy processing, and chemical corrosion resistance. To improve the cables' aging resistance, migration-resistant plasticizers, lead-free calcium-zinc composite stabilizers, and UV absorbers are typically added to the insulation to inhibit plasticizer migration and photooxidative aging. Electron beam irradiation or chemical cross-linking processes are used to form a network structure in the PVC molecular chains, enhancing heat resistance and mechanical strength. Fillers such as carbon black and aluminum hydroxide are added to the sheath to improve weather resistance and flame retardancy. These technologies have significantly increased the cable's service life and environmental adaptability, and have become the mainstream production methods in the industry.

[0003] Patent publication number CN119833236A discloses a self-repairing RF coaxial cable, a leaky coaxial cable, and methods for manufacturing the same. While meeting communication cable standards, this application further addresses the technical issues of micro-damage to the foamed insulation layer during use, which can lead to deteriorating electrical performance, reduced reliability, and reduced service life.

[0004] However, existing cables lack self-repair capabilities. When the outer insulation layer is significantly damaged by external forces such as impact or squeezing from sharp objects, moisture and corrosive gases can easily penetrate the interior, causing conductor oxidation or insulation failure. This requires manual inspection and replacement, making real-time repair impossible. The sensitivity of these cables to damage leads to reduced cable reliability and can even cause safety incidents such as short circuits and fires. Therefore, a new cable technology is needed that can automatically trigger repairs when the insulation layer is severely damaged, while also providing structural reinforcement and flame retardancy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention provides an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an aging-resistant medium and low voltage polyvinyl chloride cable, comprising an outer insulating skin, with sealing rubber sleeves glued on both sides of the outer insulating skin; a protective component is provided on the inner wall of the outer insulating skin, the protective component includes a separating film, the inner wall of the outer insulating skin is provided with a separating film, a liquid tank is reserved between two groups of separating films, the interior of the liquid tank is filled with sodium silicate solution, the inner wall of the outer insulating skin is provided with a separating sleeve, the interior of the separating sleeve is embedded with a liquid layer, the interior of the liquid layer is embedded with a repair component, the repair component includes a repair sleeve, the surface of the repair sleeve is provided with separating grooves, the separating grooves are arranged to be evenly distributed on the repair sleeve in a sheet-like structure, each group of the separating grooves is filled with alumina powder, the inner wall of the repair sleeve is provided with a bonding surface, the interior of the bonding surface is provided with a core layer sheath, the interior of the core layer sheath is embedded with a copper core, and the surface of the core layer sheath is provided with heat dissipation holes.

[0007] Furthermore, the outer insulating layer, liquid layer, separator film and separator sleeve are composed of the following components: 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium zinc composite stabilizer, 10-20 parts of activated alumina powder, 0.5-1 part of ultraviolet absorber and 0.2-0.4 part of antioxidant.

[0008] Furthermore, the separation groove is composed of the following: 100 parts of polyvinyl chloride resin, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organic tin stabilizer, 5-10 parts of carbon black filler, and 15-25 parts of aluminum hydroxide flame retardant.

[0009] Furthermore, the separation films are evenly distributed on the inner wall of the outer insulating layer, the separation sleeve is connected to the inner wall of the separation films by melting, and the outer insulating layer, the separation films and the separation sleeve are connected into an integrated structure.

[0010] Furthermore, a support sheet is embedded in the interior of the repair sleeve, and a fitting surface is provided on the inner wall of the repair sleeve, and a conducting groove is provided on the surface of the fitting surface.

[0011] Furthermore, the fitting surface is configured as an arc surface, the conducting groove is provided in the middle of the fitting surface, and the conducting groove and the separating groove are connected with each other through a gap reserved therebetween.

[0012] Furthermore, a central core rod is provided on the inner side of the repair, and the central core rod is embedded in the inner side of the three groups of core layer sheaths, and the central core rod is used to limit the position of the core layer sheaths.

[0013] Furthermore, the outer side of the central core rod abuts against the conducting groove, and the central core rod contacts the three groups of conducting grooves at the same time. The central core rod is used to support the three groups of repair sleeves.

[0014] Furthermore, the liquid layer is located between the separation sleeve and the repair sleeve, and a thin film is provided on the surface of the liquid layer, and the thin film is a PET polyester film.

[0015] A method for producing an aging-resistant medium- and low-voltage polyvinyl chloride cable comprises the following steps: S1: annealing a copper core at a temperature of 200-300° C. for 10-20 minutes, removing a surface oxide layer, impregnating the copper core with a silane coupling agent solution for 1-3 minutes, and drying the copper core for standby use; S2: weighing 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium-zinc composite stabilizer, 10-20 parts of activated alumina powder, 0.5-1 part of ultraviolet absorber, and 0.2-0.4 part of antioxidant in parts by weight; premixing the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 80-100° C. for 15-20 minutes, then adding the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continuing to mix for 30-40 minutes to prepare an outer insulating layer, a liquid layer, a separator film, and a separator sleeve; S3: 100 parts of polyvinyl chloride resin, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organic tin stabilizer, 5-10 parts of carbon black filler, and 15-25 parts of aluminum hydroxide flame retardant are weighed by weight, melt-blended at 160-180°C using a twin-screw extruder, and a separation groove is made by injection molding, and the outer insulation skin, the separation film and the separation sleeve are melt-connected to form an integrated structure; S4: alumina powder is filled into the interior of the separation groove, and the filled alumina powder is embedded into the interior of the liquid layer; S5: the pretreated conductor is passed through the insulation extruder and the sheath extruder in turn, the extrusion temperature of the insulation layer is controlled at 160-175°C, and the extrusion temperature of the sheath layer is controlled at 170-185°C, and a gradient cooling device is used after extrusion to form the conductor; S6: sodium silicate solution is passed into the interior of the liquid tank through the filling port, and after filling, it is glued to the outer insulation skin through the sealing rubber sleeve to seal the filling port.

[0016] Compared with the existing technology, the beneficial effects of the present invention include: when the outer insulating layer is damaged by external force, the isolation triggers the protective layer to rupture precisely to release alumina powder and sodium silicate solution. After mixing, the two react rapidly to form a highly insulating, high-strength aluminosilicate hardened body, and simultaneously achieve sealing and plugging of leaks, structural reinforcement and flame retardant performance enhancement of the damaged parts, and can complete self-repair without human intervention; the outer sheath reinforced protective layer is formulated with wear-resistant and weather-resistant materials to resist ultraviolet rays, chemical corrosion and mechanical impact, combined with the stress dispersion effect of the inner layer sheet structure, it is suitable for multiple scenarios such as building power distribution, industrial control, outdoor power transmission, etc., significantly improving the safety and economy of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 A schematic diagram of the three-dimensional structure of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof according to one embodiment of the present invention is shown; Figure 2 Schematically shows the structure of the outer insulation layer and sealing rubber sleeve of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to one embodiment of the present invention; Figure 3 Schematically shows the structure of a liquid tank and a separator film of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof according to one embodiment of the present invention; Figure 4 A schematic diagram of the cross-sectional structure of the outer insulation layer of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof according to one embodiment of the present invention is shown; Figure 5 Schematically shows a structural diagram of a repair sleeve and a bonding surface of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof proposed according to one embodiment of the present invention; Figure 6 Schematically shows a structural diagram of a separation groove and a repair sleeve of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof according to one embodiment of the present invention; Figure 7 Schematically shows a structural diagram of a repair sleeve and a conducting groove of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof proposed according to one embodiment of the present invention; Figure 8 A schematic diagram of an exploded structure from a first perspective of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof according to one embodiment of the present invention is shown; Figure 9 A schematic diagram of an exploded structure from a second perspective of an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof proposed according to an embodiment of the present invention is shown schematically.

[0018] In the figure: 11. Outer insulation layer; 12. Sealing rubber sleeve; 13. Core layer jacket; 14. Heat dissipation hole; 15. Copper core; 2. Protective component; 21. Liquid tank; 22. Liquid layer; 23. Separating film; 24. Thin film; 25. Liquid filling port; 26. Separating sleeve; 3. Repair component; 31. Repair sleeve; 32. Separating groove; 33. Support sheet; 34. Fitting surface; 35. Conducting groove; 36. Center core rod. DETAILED DESCRIPTION

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0020] Example 1: According to one embodiment of the present invention, Figure 1 An aging-resistant medium- and low-voltage polyvinyl chloride cable is described, comprising the following components: 100 parts polyvinyl chloride resin, 30 parts polyester plasticizer, 3 parts calcium-zinc composite stabilizer, 10 parts activated alumina powder, 0.5 parts ultraviolet absorber, and 0.2 parts antioxidant; as well as 100 parts polyvinyl chloride resin, 25 parts epoxy soybean oil plasticizer, 2 parts organotin stabilizer, 5 parts carbon black filler, and 15 parts aluminum hydroxide flame retardant copper core.

[0021] A production method for an aging-resistant medium and low voltage polyvinyl chloride cable, comprising the following steps: S1: annealing a copper core 15, controlling the annealing temperature to 200°C for 10 minutes, removing the surface oxide layer, impregnating the copper core 15 with a silane coupling agent solution for 1 minute, and drying the copper core for later use; S2: weighing 100 parts of polyvinyl chloride resin, 30 parts of polyester plasticizer, 3 parts of calcium-zinc composite stabilizer, 10 parts of activated alumina powder, 0.5 parts of ultraviolet absorber, and 0.2 parts of antioxidant in parts by weight; premixing the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 80°C for 15 minutes, then adding the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continuing to mix for 30 minutes to obtain an outer insulating layer 11, a liquid layer 22, a separator film 23, and a separator sleeve 26; S3: weighing the polyvinyl chloride resin in parts by weight; 100 parts of fat, 25 parts of epoxy soybean oil plasticizer, 2 parts of organic tin stabilizer, 5 parts of carbon black filler, and 15 parts of aluminum hydroxide flame retardant are melt-blended at 160°C using a twin-screw extruder, and a separation groove 32 is made by injection molding, and the outer insulating skin 11, the separation film 23 and the separation sleeve 26 are melt-connected to form an integrated structure; S4: alumina powder is filled into the interior of the separation groove 32, and the filled alumina powder is embedded into the interior of the liquid layer 22; S5: the pretreated conductor is passed through the insulation extruder and the sheath extruder in turn, the extrusion temperature of the insulation layer is controlled at 160°C, and the extrusion temperature of the sheath layer is controlled at 170°C, and a gradient cooling device is used after extrusion to form; S6: sodium silicate solution is introduced into the interior of the liquid tank 21 through the filling port 25, and after filling, it is glued to the outer insulating skin 11 through the sealing rubber sleeve 12 to seal the filling port 25.

[0022] Example 2: According to one embodiment of the present invention, Figure 1An aging-resistant medium- and low-voltage polyvinyl chloride cable is described, comprising the following components: 100 parts polyvinyl chloride resin, 50 parts polyester plasticizer, 5 parts calcium-zinc composite stabilizer, 20 parts activated alumina powder, 1 part ultraviolet absorber, and 0.4 parts antioxidant; and 100 parts polyvinyl chloride resin, 40 parts epoxy soybean oil plasticizer, 4 parts organotin stabilizer, 10 parts carbon black filler, and 25 parts aluminum hydroxide flame retardant.

[0023] A production method for an aging-resistant medium- and low-voltage polyvinyl chloride cable comprises the following steps: S1: annealing a copper core 15 at a controlled annealing temperature of 300°C for 20 minutes, removing a surface oxide layer, and then impregnating the copper core 15 with a silane coupling agent solution for 3 minutes, followed by drying for standby use; S2: weighing 100 parts of polyvinyl chloride resin, 50 parts of polyester plasticizer, 5 parts of calcium-zinc composite stabilizer, 20 parts of activated alumina powder, 1 part of ultraviolet absorber, and 0.4 part of antioxidant in parts by weight; premixing the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 100°C for 20 minutes, then adding the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continuing to mix for 40 minutes to obtain an outer insulating layer 11, a liquid layer 22, a separator film 23, and a separator sleeve 26; S3: weighing the polyvinyl chloride resin in parts by weight; 100 parts, 40 parts of epoxy soybean oil plasticizer, 4 parts of organic tin stabilizer, 10 parts of carbon black filler, 25 parts of aluminum hydroxide flame retardant, are melt-blended at 180°C using a twin-screw extruder, and a separation groove 32 is made by injection molding, and the outer insulating skin 11, the separation film 23 and the separation sleeve 26 are melt-connected to form an integrated structure; S4: alumina powder is filled into the interior of the separation groove 32, and the filled alumina powder is embedded into the interior of the liquid layer 22; S5: the pretreated conductor is passed through the insulation extruder and the sheath extruder in turn, the extrusion temperature of the insulation layer is controlled at 175°C, and the extrusion temperature of the sheath layer is controlled at 185°C, and a gradient cooling device is used after extrusion; S6: sodium silicate solution is introduced into the interior of the liquid tank 21 through the filling port 25, and after filling, it is glued to the outer insulating skin 11 through the sealing rubber sleeve 12 to seal the filling port 25.

[0024] Example 3: According to one embodiment of the present invention, Figures 1-9The figure shows an anti-aging medium and low voltage polyvinyl chloride cable, comprising an outer insulating layer 11, with sealing rubber sleeves 12 glued to both sides of the outer insulating layer 11. In the production and preparation of the cable, the innermost copper core 15 is protected by multiple layers of mutual sleeve connection. First, the outer insulating layer 11 is wrapped as the outermost layer, which is a first wrapping. The separation sleeve 26 inside the outer insulating layer 11 is wrapped for the second time. Then the liquid layer 22 is wrapped for the third time. The support sheet 33 is wrapped for the fourth time. The core layer sheath 13 is wrapped for the fourth time. The fifth wrapping is carried out, and the protection of the core layer sheath 13 is increased by wrapping the inner and outer five layers. The specific functions of each layer are as follows: the inner wall of the outer insulating skin 11 is provided with a protective component 2, and the protective component 2 includes a separator film 23. The inner wall of the outer insulating skin 11 is provided with a separator film 23, and a liquid tank 21 is reserved between the two groups of separator films 23. The interior of the liquid tank 21 is filled with sodium silicate solution. The inner wall of the outer insulating skin 11 is provided with a separator sleeve 26, and the separator films 23 are evenly distributed on the inner wall of the outer insulating skin 11 to separate The sleeve 26 is connected to the inner wall of the separator film 23 by melting, and the outer insulating skin 11, the separator film 23 and the separator sleeve 26 are connected into an integral structure. When the outer insulating skin 11, the separator film 23 and the separator sleeve 26 are an integral structure, the outer insulating skin 11, the separator film 23 and the separator sleeve 26 constitute a liquid tank 21. By injecting sodium silicate into the interior of the liquid tank 21, the interior of the liquid tank 21 is filled, and the outer insulating skin 11 and the separator sleeve 26 are separated. The function of the separation is that the heat on the outer insulating skin 11 is not easily transferred to the separation sleeve 26, and thus the heat transfer to the liquid layer 22 can also be suppressed; the interior of the separation sleeve 26 is embedded with a liquid layer 22, and the liquid layer 22 is between the separation sleeve 26 and the repair sleeve 31. The surface of the liquid layer 22 is provided with a film sheet 24, and the film sheet 24 is a PET polyester film. When the interior of the separation groove 32 is filled with alumina powder, the alumina powder and the sodium silicate solution are separated by the film sheet 24, the separation sleeve 26 and the liquid layer 22.

[0025] The multi-layer design maximizes the protection of the copper core 15 and prevents damage and breakage of the copper core 15. First, the outer insulation layer 11 provides the first layer of protection. During daily use, the cable will come into contact with the ground or other objects. The movement of the cable after contact will cause varying degrees of wear on the cable surface. The outer insulation layer 11 can eliminate the effects of wear on the copper core 15. At the same time, the outer insulation layer 11 also plays an important role in the strength of the entire cable. Secondly, the separator films 23 on the inner side of the outer insulation layer 11 are evenly distributed within the outer insulation layer 11, and the liquid filling port 25 passes through each set of separator films 23, so that the liquid filling port 25 and the liquid reservoir 21 are connected. In this way, when the sodium silicate solution is injected into the liquid filling port 25 through the pipeline, the solution can well fill each set of liquid reservoirs 21. With the participation of liquid, the efficiency of heat transfer can be reduced, reducing the sensitivity of the copper core 15 to the heat from the outer insulation layer 11.

[0026] Based on the foundation of these two layers, the protection of the copper core 15 can be further improved by establishing a repair component 3, and the specific operations are as follows: a repair component 3 is embedded in the interior of the liquid layer 22, and the repair component 3 includes a repair sleeve 31, and a support sheet 33 is embedded in the interior of the repair sleeve 31. The inner wall of the repair sleeve 31 is provided with a fitting surface 34, and a conducting groove 35 is provided on the surface of the fitting surface 34. The surface of the repair sleeve 31 is provided with a separation groove 32, and the separation groove 32 is set as a sheet structure evenly distributed on the repair sleeve 31, and each group of separation grooves 32 is filled with alumina powder, and the inner wall of the repair sleeve 31 is provided with a fitting surface 34, and the fitting surface 34 is set as an arc surface. The through groove 35 is opened in the middle position of the fitting surface 34, and the reserved gap between the conducting groove 35 and the dividing groove 32 is connected. The inside of the fitting surface 34 is provided with a core layer sheath 13, and the inside of the core layer sheath 13 is embedded with a copper core 15. The surface of the core layer sheath 13 is provided with a heat dissipation hole 14. The inner side of the repair sleeve 31 is provided with a central core rod 36, and the central core rod 36 is embedded in the inner side of the three groups of core layer sheaths 13. The central core rod 36 is used to limit the position of the core layer sheath 13. The outer side of the central core rod 36 is in contact with the conducting groove 35. The central core rod 36 is in contact with the three groups of conducting grooves 35 at the same time. The central core rod 36 is used to support the three groups of repair sleeves 31.

[0027] In the third layer of protection, protection is provided by a liquid layer 22, wherein the liquid layer 22 not only participates in the protection of the copper core 15, but also participates in the separation of alumina powder and sodium silicate. By uniformly filling alumina powder between each set of separation grooves 32 and covering the repair sleeve 31 with the liquid layer 22, it is ensured that the alumina powder is always between the repair sleeve 31 and the liquid layer 22. When the cable is scratched by a sharp thorn, the invasion of foreign matter causes damage to the outer insulating skin 11. Under normal circumstances, foreign matter cannot completely break through the isolation of the outer insulating skin 11. The invasion of foreign matter will cause the surface of the outer insulating skin 11 to be concave and deformed. When the outer insulating skin 11 is concave and deformed, the side facing away from the concave will locally protrude. Therefore, this state is defined as the invasion of foreign matter. When the invasion of foreign matter squeezes the separation sleeve 26, it makes The separation sleeve 26 is recessed to one side inward, thereby forcing the film sheet 24 on the liquid layer 22 to be recessed. When the film sheet 24 is recessed, due to the relatively poor ductility of the film sheet 24, the invasion of foreign matter directly causes the film sheet 24 to rupture. At this time, the sodium silicate solution inside the liquid tank 21 will flow onto the repair sleeve 31 and react with the alumina powder inside the separation groove 32. As the reaction proceeds, the free silicate in the solution combines with the aluminum ions to form aluminosilicate gel or amorphous aluminosilicate. The product gradually hardens to form a solid, filling the damaged part of the cable. It gradually hardens within 30-60 minutes at room temperature, blocking the damaged channel and preventing moisture penetration. In this way, internal repair is achieved, and after hardening, it can provide better supporting force, which can prevent foreign matter from damaging the copper core 15 again.

[0028] In addition, the sheet-like structure design of the dividing groove 32 facilitates angle adjustment during laying, and secondly, it can disperse stress. When the outer insulating skin 11 is bent, the dividing groove 32 produces elastic deformation. The setting of the dividing groove 32 allows adjacent sheets to shift, avoiding the internal stress concentration caused by bending of the traditional solid insulation layer. The asymmetric distribution of the sheet structure can achieve preferential bending of the cable in a specific direction. When the cable is subjected to external impact, the dividing groove 32 absorbs energy through plastic deformation, reducing damage to the internal conductor and insulation layer.

[0029] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An anti-aging medium and low voltage polyvinyl chloride cable, characterized in that: It includes an outer insulating skin, and sealing rubber sleeves are glued on both sides of the outer insulating skin; a protective component is provided on the inner wall of the outer insulating skin, and the protective component includes a separating film. The inner wall of the outer insulating skin is provided with a separating film, and a liquid tank is reserved between the two groups of separating films, and the interior of the liquid tank is filled with sodium silicate solution; a separating sleeve is provided on the inner wall of the outer insulating skin, and a liquid layer is embedded in the interior of the separating sleeve, and a repair component is embedded in the interior of the liquid layer, and the repair component includes a repair sleeve, and the surface of the repair sleeve is provided with separating grooves, and the separating grooves are arranged to be sheet-like structures and evenly distributed on the repair sleeve, and each group of the separating grooves is filled with alumina powder, and the inner wall of the repair sleeve is provided with a fitting surface, and a core layer sheath is provided inside the fitting surface, and a copper core is embedded in the interior of the core layer sheath, and the surface of the core layer sheath is provided with heat dissipation holes.

2. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: The outer insulating layer, liquid layer, separating film and separating sleeve are composed of the following components: 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium zinc composite stabilizer, 10-20 parts of active alumina powder, 0.5-1 part of ultraviolet absorber and 0.2-0.4 part of antioxidant.

3. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: The separation groove is composed of the following components: 100 parts of polyvinyl chloride resin, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organic tin stabilizer, 5-10 parts of carbon black filler, and 15-25 parts of aluminum hydroxide flame retardant.

4. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: The separation films are evenly distributed on the inner wall of the outer insulating skin, the separation sleeve is connected to the inner wall of the separation films by melting, and the outer insulating skin, the separation films and the separation sleeve are connected into an integrated structure.

5. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: A supporting sheet is embedded in the interior of the repair sleeve, and a fitting surface is provided on the inner wall of the repair sleeve. A conducting groove is provided on the surface of the fitting surface.

6. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 5, characterized in that: The fitting surface is configured as an arc surface, the conducting groove is provided in the middle of the fitting surface, and the conducting groove and the separating groove are connected via a gap reserved therebetween.

7. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: A central core rod is provided on the inner side of the repair sleeve. The central core rod is embedded in the inner sides of the three groups of core layer sheaths. The central core rod is used to limit the position of the core layer sheaths.

8. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 7, characterized in that: The outer side of the central core rod abuts against the conducting groove, and the central core rod contacts the three groups of conducting grooves at the same time. The central core rod is used to support the three groups of repair sleeves.

9. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 1, characterized in that: The liquid layer is located between the separation sleeve and the repair sleeve. A film sheet is provided on the surface of the liquid layer, and the film sheet is a PET polyester film.

10. The method for producing an anti-aging medium and low voltage polyvinyl chloride cable according to claim 9, characterized in that: The following steps are involved: S1: annealing the copper core at a temperature of 200-300°C for 10-20 minutes, removing the surface oxide layer, and then immersing it in a silane coupling agent solution for 1-3 minutes, drying it for later use; S2: weighing 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium-zinc composite stabilizer, 10-20 parts of activated alumina powder, 0.5-1 part of ultraviolet absorber, and 0.2-0.4 part of antioxidant in parts by weight, premixing the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 80-100°C for 15-20 minutes, then adding the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continuing to mix for 30-40 minutes to prepare an outer insulating layer, a liquid layer, a separator film, and a separator sleeve; S3: weighing 100 parts of polyvinyl chloride resin in parts by weight, 0 parts, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organic tin stabilizer, 5-10 parts of carbon black filler, 15-25 parts of aluminum hydroxide flame retardant, melt-blended at 160-180°C using a twin-screw extruder, and a separation groove is made by injection molding, and the outer insulating skin, the separation film and the separation sleeve are melt-connected to form an integrated structure; S4: filling the interior of the separation groove with alumina powder, and embedding the filled alumina powder into the interior of the liquid layer; S5: passing the pretreated conductor through an insulation extruder and a sheath extruder in sequence, the extrusion temperature of the insulation layer is controlled at 160-175°C, the extrusion temperature of the sheath layer is controlled at 170-185°C, and after extrusion, a gradient cooling device is used for molding; S6: sodium silicate solution is introduced into the interior of the liquid bin through the filling port, and after filling, it is glued to the outer insulating skin through a sealing rubber sleeve to seal the filling port.

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