A copper core cross-linked polyethylene insulated cable

Abstract

The present application relates to the technical field of power cable, in particular to a copper core cross-linked polyethylene insulated cable, comprising: two cross-linked polyethylene layers one, two cross-linked polyethylene layers one are symmetrically provided with two cross-linked polyethylene layers two, two cross-linked polyethylene layers two are provided with a heat dissipation layer one, the heat dissipation layer one is provided with a flame-retardant layer two, the flame-retardant layer two is provided with an insulation layer one, the insulation layer one is provided with a flame-retardant layer one, the flame-retardant layer one is provided with a protective layer two, the protective layer two is provided with a protective layer one; The operator can complete installation and disassembly without complex training, save manpower and time cost, improve installation efficiency, even in long-term use under external force, can effectively prevent internal wire core from being eroded by external environment, prolong the service life of the cable, the heat generated by the cable when current passes through can be quickly dissipated, avoid the insulation material aging problem caused by the high temperature of the cable.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a copper core cross-linked polyethylene insulated cable. Background Technology

[0002] Cross-linked polyethylene (XLPE) is a thermoplastic polymer material formed by the polymerization reaction of ethylene monomers. It is also one of the most produced and widely used plastics in the world. Its simple and stable structure endows it with many excellent properties: it is chemically stable at room temperature, resistant to corrosion by most acid, alkali and salt solutions, and does not easily react with external substances; in terms of physical properties, it is lightweight and flexible, and can be processed into various forms such as films, pipes, sheets, and cable insulation layers according to needs. It also has good impact resistance and electrical insulation, and its cost is relatively low, making it easy to mass-produce industrially.

[0003] Currently, most copper core cross-linked polyethylene insulated cables on the market have the following shortcomings during use: the installation and disassembly process is cumbersome, requiring a lot of manpower and time, resulting in low installation efficiency; moreover, during repeated disassembly and assembly, the cable connection points are prone to loosening, leading to poor contact, affecting the stability of power transmission, and may even cause safety accidents.

[0004] Meanwhile, most existing copper core cross-linked polyethylene insulated cables have poor outer shell strength and heat dissipation. During long-term use, the outer shell is prone to deformation and damage due to external pressure or impact. This not only affects the cable's appearance but also reduces its protective performance, making the internal core susceptible to corrosion from the external environment and shortening the cable's service life. Due to its poor heat dissipation performance, the heat generated when current passes through is difficult to dissipate quickly, leading to an increase in cable temperature, accelerating the aging of the insulation material, further affecting the cable's safety and reliability, and potentially causing serious consequences such as fires. In view of this, we propose a copper core cross-linked polyethylene insulated cable. Summary of the Invention

[0005] The purpose of this invention is to provide a copper core cross-linked polyethylene insulated cable to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A copper core cross-linked polyethylene insulated cable, comprising:

[0008] Two cross-linked polyethylene layers 1, two cross-linked polyethylene layers 2 are symmetrically arranged in each of the two cross-linked polyethylene layers 1, a heat dissipation layer 1 is sleeved on the two cross-linked polyethylene layers 2, a flame retardant layer 2 is sleeved on the heat dissipation layer 1, an insulation layer 1 is sleeved on the flame retardant layer 2, a flame retardant layer 1 is sleeved on the insulation layer 1, a protective layer 2 is sleeved on the flame retardant layer 1, and a protective layer 1 is sleeved on the protective layer 2.

[0009] Four copper cores are located within four cross-linked polyethylene layers 2. A fixing layer is sleeved on each copper core. A connecting layer is sleeved on the fixing layer. An insulating layer 2 is sleeved on the connecting layer. A heat dissipation layer 2 is sleeved on the insulating layer 2. A flame retardant layer 3 is sleeved on the heat dissipation layer 2. A protective layer 4 is sleeved on the flame retardant layer 3. A protective layer 3 is sleeved on the protective layer 4.

[0010] A quick-release assembly, which is located on the first cross-linked polyethylene layer and is used to fix the first cross-linked polyethylene layer;

[0011] A threaded assembly located on a copper core and used to fix the copper core.

[0012] Preferably, the quick-release assembly includes:

[0013] The base and outer shell are respectively fitted onto the sides of two cross-linked polyethylene layers that are close to each other. The outer shell is fitted onto the base and has a hollow cylinder fitted on it. The hollow cylinder has a V-shaped groove. A spring is fitted on the outer shell and inside the hollow cylinder. The base has several circular grooves I, and the outer shell has several circular grooves II. Several steel balls are arranged in several circular grooves II and extend into several circular grooves I. Sealing gaskets I and II are fixedly installed on the base, and one side of each sealing gasket I and sealing gasket II abuts against the outer shell.

[0014] Preferably, the hollow cylinder is slidably connected to the outer shell, and the steel ball is slidably connected to the circular groove.

[0015] Preferably, the spring is fixedly connected to the outer shell and the hollow cylinder, and the steel ball is slidably connected to the circular groove.

[0016] Preferably, the steel balls are arranged in a ring-shaped, equally spaced structure.

[0017] Preferably, the threaded assembly includes:

[0018] A square shell is fixedly installed between four cross-linked polyethylene layers. A fixing buckle 1 and a fixing buckle 2 are provided inside the square shell. Four copper cores are provided between the fixing buckle 1 and the fixing buckle 2. A threaded rod is provided at the top of the square shell. The threaded rod passes through the square shell and the fixing buckle 2 and extends into the fixing buckle 1.

[0019] Preferably, the threaded rod is threadedly connected to the fixed buckle, and the threaded rod is rotatably connected to the fixed buckle.

[0020] Preferably, the square shell is rotatably connected to the threaded rod.

[0021] Preferably, the second protective layer is tightly bonded to the first protective layer.

[0022] Preferably, the first protective layer is located inside the first cross-linked polyethylene layer, the third protective layer is located inside the second cross-linked polyethylene layer, and the fourth protective layer is tightly bonded to the third protective layer.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This copper-core cross-linked polyethylene (XLPE) insulated cable, through the cooperation of XLPE layer 1, XLPE layer 2, protective layer 1, protective layer 2, flame-retardant layer 1, flame-retardant layer 2, heat dissipation layer 1, insulation layer 1, protective layer 3, protective layer 4, flame-retardant layer 3, heat dissipation layer 2, insulation layer 2, fixing layer, connecting layer, quick-release assembly, and threaded assembly, allows operators to complete installation and disassembly without complex training, saving manpower and time costs, improving installation efficiency, and ensuring a stable connection even during repeated disassembly and assembly, effectively avoiding poor contact, thus ensuring the stability of power transmission, reducing the risk of safety accidents, and remaining intact even under external forces during long-term use. This not only ensures the cable's aesthetics but also enhances its protective performance, effectively preventing the internal core from being corroded by the external environment, extending the cable's service life. Simultaneously, the heat generated when current flows through the cable can be quickly dissipated, avoiding the problem of insulation material aging caused by excessive cable temperature, further improving the cable's safety and reliability, and reducing the probability of serious consequences such as fires. Attached Figure Description

[0025] Figure 1 This is one of the overall structural schematic diagrams of the present invention;

[0026] Figure 2 This is the second schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is a detailed structural diagram of the internal structure of the outer shell in this invention;

[0028] Figure 4 This is a detailed structural diagram of the base in this invention;

[0029] Figure 5 This is a schematic diagram of the shell region structure in this invention;

[0030] Figure 6This is a schematic diagram of the exploded structure of the fixed buckle area in this invention;

[0031] Figure 7 This is a detailed internal structural diagram of the cross-linked polyethylene layer in this invention;

[0032] Figure 8 This is a detailed structural diagram of the internal structure of the cross-linked polyethylene layer II in this invention.

[0033] In the diagram: 1. Cross-linked polyethylene layer one; 2. Cross-linked polyethylene layer two; 3. Hollow cylinder; 4. Base; 5. Outer shell; 6. Spring; 7. V-groove; 8. Circular groove one; 9. Steel ball; 10. Sealing gasket one; 11. Sealing gasket two; 12. Square shell; 13. Copper core; 14. Threaded rod; 15. Fixing buckle one; 16. Fixing buckle two; 17. Circular groove two; 18. Protective layer one; 19. Protective layer two; 20. Flame retardant layer one; 21. Flame retardant layer two; 22. Heat dissipation layer one; 23. Insulation layer one; 24. Protective layer three; 25. Protective layer four; 26. Flame retardant layer three; 27. Heat dissipation layer two; 28. Insulation layer two; 29. ​​Fixing layer; 30. Connecting layer. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-8 As shown, the present invention provides a technical solution:

[0036] A copper core cross-linked polyethylene insulated cable, comprising:

[0037] Two cross-linked polyethylene layers 1, each containing two cross-linked polyethylene layers 2 symmetrically arranged, a heat dissipation layer 22 covered on the two cross-linked polyethylene layers 2, a flame retardant layer 21 covered on the heat dissipation layer 22, an insulation layer 23 covered on the flame retardant layer 21, a flame retardant layer 20 covered on the insulation layer 23, a protective layer 19 covered on the flame retardant layer 20, and a protective layer 18 covered on the protective layer 19.

[0038] Four copper cores 13 are located within four cross-linked polyethylene layers 2. A fixing layer 29 is fitted on the copper core 13. A connecting layer 30 is fitted on the fixing layer 29. An insulating layer 28 is fitted on the connecting layer 30. A heat dissipation layer 27 is fitted on the insulating layer 28. A flame retardant layer 3 26 is fitted on the heat dissipation layer 27. A protective layer 4 25 is fitted on the flame retardant layer 3 26. A protective layer 3 24 is fitted on the protective layer 4 25.

[0039] The quick-release assembly is located on the cross-linked polyethylene layer 1 and is used to fix the cross-linked polyethylene layer 1.

[0040] The threaded assembly, located on the copper core 13, is used to fix the copper core 13. Through the cooperation of cross-linked polyethylene layer 1, cross-linked polyethylene layer 2, protective layer 18, protective layer 19, flame-retardant layer 20, flame-retardant layer 21, heat dissipation layer 22, insulation layer 23, protective layer 3 24, protective layer 4 25, flame-retardant layer 3 26, heat dissipation layer 27, insulation layer 28, fixing layer 29, connecting layer 30, quick-release assembly, and the threaded assembly, operators can complete installation and disassembly without complex training, saving labor and time costs, improving installation efficiency, even during repeated disassembly and assembly. It ensures a secure connection, effectively preventing poor contact and thus guaranteeing the stability of power transmission, reducing the risk of safety accidents. Even under external forces during long-term use, it remains intact, ensuring both the cable's aesthetics and its protective performance. It effectively prevents the internal core from being corroded by the external environment, extending the cable's service life. At the same time, the heat generated when current passes through the cable can be quickly dissipated, avoiding the aging of insulation materials caused by excessive cable temperature, further improving the cable's safety and reliability, and reducing the probability of serious consequences such as fires.

[0041] In this embodiment, the quick-release component includes:

[0042] The base 4 and the outer shell 5 are respectively fitted on the side of the two cross-linked polyethylene layers 1 that are close to each other. The outer shell 5 is fitted on the base 4. A hollow cylinder 3 is fitted on the outer shell 5. A V-shaped groove 7 is opened in the hollow cylinder 3. A spring 6 is fitted on the outer shell 5 and inside the hollow cylinder 3. Several circular grooves 8 are opened on the base 4. Several circular grooves 17 are opened on the outer shell 5. Several steel balls 9 are set in the several circular grooves 17. The steel balls 9 extend into the several circular grooves 8. A sealing gasket 10 and a sealing gasket 21 are fixedly installed on the base 4. One side of the sealing gasket 10 and the sealing gasket 21 both abut against the outer shell 5. The base 4 and the outer shell 5 are respectively fitted on the side of the two cross-linked polyethylene layers 1 that are close to each other. The outer shell 5 slides along the outer shell 5 under the elastic force of the base. The V-shaped groove 7 inside the outer shell 5 squeezes the steel balls 9 in the circular grooves 17 on the outer shell 5.

[0043] Under the pressure of the V-shaped groove 7, the steel ball 9 slides from the circular groove 17 into the circular groove 8 on the base 4, and several steel balls 9 are distributed in a ring at equal intervals. The base 4 and the outer shell 5 are tightly connected through multi-point fixing, thereby fixing the two cross-linked polyethylene layers 1.

[0044] Sealing gasket 10 and sealing gasket 21 press against the outer shell 5 to seal and prevent external dust and moisture from entering the component and affecting the connection stability. Pulling the hollow cylinder 3 away from the base 4 compresses the spring 6, releasing the compression between the V-groove 7 and the steel ball 9. Without compression, the steel ball 9 slides back from the circular groove 18 into the circular groove 27. At this time, the fixed relationship between the base 4 and the outer shell 5 is released, and the two cross-linked polyethylene layers 1 can be separated, completing the quick disassembly.

[0045] In this embodiment, the hollow cylinder 3 is slidably connected to the outer shell 5, and the steel ball 9 is slidably connected to the circular groove 17, ensuring that the hollow cylinder 3 can slide normally on the outer shell 5 and the steel ball 9 can slide normally in the circular groove 17.

[0046] In this embodiment, the spring 6 is tightly welded to the outer shell 5 and the hollow cylinder 3, and the steel ball 9 is slidably connected to the circular groove 8, ensuring the structural stability of the spring 6, the outer shell 5, and the hollow cylinder 3, and ensuring that the steel ball 9 can slide normally in the circular groove 8.

[0047] In this embodiment, the steel balls 9 are arranged in a ring with equal spacing to ensure that the steel balls 9 are subjected to uniform force, effectively dispersing the pressure generated when the outer shell 5 is connected to the base 4, and enhancing the stability of the overall structure.

[0048] In this embodiment, the threaded assembly includes:

[0049] A square shell 12 is fixedly installed between four cross-linked polyethylene layers 2. A first fixing buckle 15 and a second fixing buckle 16 are provided inside the square shell 12. Four copper cores 13 are positioned between the first fixing buckle 15 and the second fixing buckle 16. A threaded rod 14 is provided at the top of the square shell 12, passing through the square shell 12 and the second fixing buckle 16 and extending into the first fixing buckle 15. The square shell 12 is fixedly installed between the four cross-linked polyethylene layers 2, with the first fixing buckle 15 and the second fixing buckle 16 placed inside the square shell 12, and the four copper cores 13 placed between the first fixing buckle 15 and the second fixing buckle 16. Between; rotate the threaded rod 14. Since the threaded rod 14 is threadedly connected to the second fixed buckle 16 and rotatably connected to the first fixed buckle 15, the threaded transmission will drive the second fixed buckle 16 to move towards the first fixed buckle 15. As the second fixed buckle 16 moves, the distance between the first fixed buckle 15 and the second fixed buckle 16 decreases, forming a clamping force on the four copper cores 13, thus achieving stable fixation of the copper cores 13. If it is necessary to adjust the position of the copper cores 13, rotate the threaded rod 14 in the opposite direction. The second fixed buckle 16 will move away from the first fixed buckle 15, the clamping force will be released, and the position of the copper cores 13 can be adjusted and then re-fixed.

[0050] In this embodiment, the threaded rod 14 is threadedly connected to the fixed buckle 2 16, and the threaded rod 14 is rotatably connected to the fixed buckle 15, ensuring that under the action of the thread, the rotating threaded rod 14 can drive the fixed buckle 2 16 to move, and ensuring that the threaded rod 14 can rotate normally within the fixed buckle 15.

[0051] In this embodiment, the square shell 12 is rotatably connected to the threaded rod 14, ensuring that the threaded rod 14 can rotate normally on the square shell 12.

[0052] In this embodiment, the second protective layer 19 is tightly attached to the first protective layer 18 to ensure the structural stability of the second protective layer 19 and the first protective layer 18.

[0053] In this embodiment, protective layer 18 is located inside cross-linked polyethylene layer 1, protective layer 24 is located inside cross-linked polyethylene layer 2, and protective layer 4 25 is tightly attached to protective layer 3 24 to ensure the structural stability of protective layer 4 25 and protective layer 3 24.

[0054] In this embodiment, when the copper core 13 cross-linked polyethylene insulated polyvinyl chloride sheathed wire and cable is in use, the base 4 and the outer shell 5 are respectively fitted on the two cross-linked polyethylene layers 1 on the side that are close to each other. During installation, the outer shell 5 is fitted on the base 4 so that the two form a nested fit.

[0055] A hollow cylinder 3 is fitted onto the outer shell 5, and the hollow cylinder 3 is slidably connected to the outer shell 5. A spring 6 is tightly welded between the outer shell 5 and the hollow cylinder 3. In the initial state, the spring 6 is in a naturally extended state, pushing the hollow cylinder 3 to slide along the outer wall of the outer shell 5, so that the V-shaped groove 7 inside the hollow cylinder 3 is aligned with the circular groove 17 on the outer shell 5.

[0056] Steel balls 9 are provided in several circular grooves 17 on the outer shell 5. The steel balls 9 are slidably connected to the circular grooves 17, and the steel balls 9 are arranged in a ring-shaped structure with equal spacing. When the V-shaped groove 7 of the hollow cylinder 3 is aligned with the circular groove 17, the steel balls 9 are partially extended into the circular groove 8 opened on the base 4 under the squeezing action of the hollow cylinder 3, and the steel balls 9 are slidably connected to the circular groove 8. The positioning and fixing of the base 4 and the outer shell 5 are achieved through the cooperation of "steel balls-double circular grooves", thereby stably connecting the two cross-linked polyethylene layers 1.

[0057] Sealing gasket 10 and sealing gasket 21 are fixedly installed on the base 4. When the base 4 is nested with the outer shell 5, one side of sealing gasket 10 and sealing gasket 21 both abut against the inner wall of the outer shell 5, forming a double sealing structure. This can effectively block external moisture, dust and other impurities from entering the cable, prevent the internal copper core 13 or insulation layer from getting damp and contaminated, and ensure stable electrical performance.

[0058] When it is necessary to disassemble the two cross-linked polyethylene layers 1, push the hollow cylinder 3 towards the spring 6 so that the hollow cylinder 3 compresses the spring 6 and slides along the outer shell 5. At this time, the V-shaped groove 7 inside the hollow cylinder 3 is misaligned with the circular groove 17. The steel ball 9 loses the squeezing constraint of the hollow cylinder 3 and can exit from the circular groove 8 of the base 4 and retract into the circular groove 17 of the outer shell 5. The positioning constraint between the base 4 and the outer shell 5 is released, and the two can be separated to achieve quick disassembly.

[0059] The top of the square shell 12 is provided with a threaded rod 14, which passes through the square shell 12 and the second fixing buckle 16 and extends into the first fixing buckle 15. The threaded rod 14 is rotatably connected to the square shell 12, threadedly connected to the second fixing buckle 16, and rotatably connected to the first fixing buckle 15.

[0060] When it is necessary to fix the copper core 13, rotate the threaded rod 14 clockwise. Since the threaded rod 14 is threadedly engaged with the fixing buckle 16 and the square shell 12 restricts the rotation of the fixing buckle 16, the rotation of the threaded rod 14 will be converted into the downward movement of the fixing buckle 16 along the axial direction of the threaded rod 14. At the same time, the threaded rod 14 is rotatably connected with the fixing buckle 15. The fixing buckle 15 remains in place. During the downward movement of the fixing buckle 16, it will form a counter-clamping force with the fixing buckle 15, which will firmly fix the four copper cores 13 located between them and prevent the copper cores 13 from shifting. When it is necessary to adjust the position of the copper core 13 or remove it, rotate the threaded rod 14 counterclockwise. The fixing buckle 16 will move upward along the axial direction of the threaded rod 14, and the clamping force will be released, so that the copper core can be adjusted or removed.

[0061] In this embodiment, the fixing layer 29 is glass fiber reinforced polypropylene (PP), and the connecting layer 30 is EVA hot melt adhesive film or elastic polyolefin. The two work together to ensure that the copper core 13 is stably positioned within the cross-linked polyethylene layer 2, and to prevent the copper core 13 from shifting due to cable bending or vibration.

[0062] The second insulation layer 28 is made of cross-linked polyethylene insulation material, which blocks the current conduction between the copper core 13 and the outside world, and prevents the risk of leakage.

[0063] The heat dissipation layer 27 is a graphite-filled polyolefin composite material, which can absorb the heat generated by the copper core 13 during operation and conduct it outward, avoiding local high temperature from affecting the transmission performance.

[0064] Flame retardant layer 3, 26, is a halogen-free, low-smoke flame retardant polyolefin that prevents the flame from spreading to the copper core 13 in high-temperature or fire scenarios, ensuring the cable can operate normally for a short period of time in emergency situations.

[0065] The fourth protective layer 25 is made of nylon, and the third protective layer 24 is made of high-density polyethylene (HDPE) to further enhance physical protection and resist slight wear and compression inside the cross-linked polyethylene layer 2.

[0066] A heat dissipation layer 22, a flame retardant layer 21, an insulation layer 23, a flame retardant layer 20, a protective layer 29, and a protective layer 18 are sequentially layered outside the cross-linked polyethylene layer 2, forming a reinforced structure with double heat dissipation, double flame retardancy, double insulation, and double protection.

[0067] Heat dissipation layer 1 22 is made of graphene composite polyolefin film, which together with heat dissipation layer 2 27 forms a dual heat dissipation system with inner heat absorption and outer heat dissipation, improving the overall heat dissipation efficiency. Both are mainly made of halogen-free low-smoke flame-retardant polyolefin. In some scenarios, flame-retardant layer 1 20 will use flame-retardant cross-linked polyethylene to form a double flame-retardant barrier, expand the flame-retardant range, and enhance the fire resistance of the cable.

[0068] Insulation layer 1 (23) is made of cross-linked polyethylene, which together with insulation layer 2 (28) forms double insulation protection, further reducing the risk of leakage current and making it suitable for scenarios with high safety requirements.

[0069] The first protective layer 18 is made of outdoor-grade polyvinyl chloride or chlorinated polyethylene, and the second protective layer 19 is made of high-density polyethylene. As the outermost layer of protection, it is in direct contact with the external environment and resists external influences such as sunlight, rain, and mechanical impact.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A copper-core cross-linked polyethylene insulated cable, characterized in that, include: Two cross-linked polyethylene layers (1) are provided, and two cross-linked polyethylene layers (2) are symmetrically arranged in each of the two cross-linked polyethylene layers (1). A heat dissipation layer (22) is provided on the two cross-linked polyethylene layers (2). A flame retardant layer (21) is provided on the heat dissipation layer (22). An insulating layer (23) is provided on the flame retardant layer (21). A flame retardant layer (20) is provided on the insulating layer (23). A protective layer (19) is provided on the flame retardant layer (20). A protective layer (18) is provided on the protective layer (19). Four copper cores (13) are located in four cross-linked polyethylene layers (2). A fixing layer (29) is provided on the copper cores (13). A connecting layer (30) is provided on the fixing layer (29). An insulating layer (28) is provided on the connecting layer (30). A heat dissipation layer (27) is provided on the insulating layer (28). A flame retardant layer (26) is provided on the heat dissipation layer (27). A protective layer (25) is provided on the flame retardant layer (26). A protective layer (24) is provided on the protective layer (25). It also includes a quick-release assembly, which is located on the cross-linked polyethylene layer (1) and is used to fix the cross-linked polyethylene layer (1); The quick-release assembly includes: The base (4) and the outer shell (5) are respectively fitted on the side of two cross-linked polyethylene layers (1) that are close to each other. The outer shell (5) is fitted on the base (4). A hollow cylinder (3) is fitted on the outer shell (5). A V-shaped groove (7) is opened in the hollow cylinder (3). A spring (6) is fitted on the outer shell (5) and inside the hollow cylinder (3). A number of circular grooves (8) are opened on the base (4). A number of circular grooves (17) are opened on the outer shell (5). A number of steel balls (9) are arranged in the circular grooves (17). The steel balls (9) extend into the circular grooves (8). A sealing gasket (10) and a sealing gasket (21) are fixedly installed on the base (4). One side of the sealing gasket (10) and the sealing gasket (21) abuts against the outer shell (5).

2. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that: The hollow cylinder (3) is slidably connected to the outer shell (5), and the steel ball (9) is slidably connected to the circular groove (17).

3. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that: The spring (6) is fixedly connected to the outer shell (5) and the hollow cylinder (3), and the steel ball (9) is slidably connected to the circular groove (8).

4. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that: Several of the steel balls (9) are arranged in a ring-shaped, equally spaced structure.

5. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that: It also includes a threaded assembly located on the copper core (13) and used to fix the copper core (13); The threaded assembly includes: A square shell (12) is fixedly installed between four cross-linked polyethylene layers (2). A fixing buckle one (15) and a fixing buckle two (16) are provided inside the square shell (12). Four copper cores (13) are provided between the fixing buckle one (15) and the fixing buckle two (16). A threaded rod (14) is provided at the top of the square shell (12). The threaded rod (14) passes through the square shell (12) and the fixing buckle two (16) and extends into the fixing buckle one (15).

6. The copper core cross-linked polyethylene insulated cable according to claim 5, characterized in that: The threaded rod (14) is threadedly connected to the fixed buckle two (16), and the threaded rod (14) is rotatably connected to the fixed buckle one (15).

7. The copper core cross-linked polyethylene insulated cable according to claim 5, characterized in that: The square shell (12) is rotatably connected to the threaded rod (14).

8. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that: The second protective layer (19) is closely attached to the first protective layer (18).

9. The copper core cross-linked polyethylene insulated cable according to claim 1, characterized in that, The first protective layer (18) is located inside the first cross-linked polyethylene layer (1), the third protective layer (24) is located inside the second cross-linked polyethylene layer (2), and the fourth protective layer (25) is closely attached to the third protective layer (24).

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