A crosslinked polyethylene based cable termination joint structure

Abstract

This invention belongs to the field of cable joint technology, and specifically discloses a cable terminal joint structure based on cross-linked polyethylene, comprising: an insulating copper shell protective box, the insulating copper shell protective box being cylindrical in shape, with sealing tubes symmetrically connected to both ends of the insulating copper shell protective box; and a conductor connecting tube, located at the axis of the insulating copper shell protective box, used to realize the electrical connection between the internal conductor of the cable and the conductor at the mating end. This invention, by incorporating a protective device, allows the outer convex strip of the protective tube to initially absorb energy through deformation when subjected to falling objects, hail, or construction impacts; axial impacts are converted into elastic potential energy by a first damping spring, and radial high-frequency impacts are dissipated by a second damping spring through a push rod and ball bearings, ultimately reducing the impact load transmission efficiency and effectively avoiding damage such as internal stress cone cracks and equipotential sleeve displacement, thus preventing accidents such as electric field distortion and insulation breakdown caused by impacts.

Description

Technical Field

[0001] This invention belongs to the field of cable joint technology, and particularly relates to a cable terminal joint structure based on cross-linked polyethylene. Background Technology

[0002] Cable termination joints (hereinafter referred to as cable terminations) are special connection devices at the ends of power cable lines such as cross-linked polyethylene cables. Their core function is to realize the electrical connection between the cable and electrical equipment (such as transformers, switch cabinets, and overhead lines), while providing insulation protection, sealing protection, and electric field optimization for the cable ends to ensure the safety and reliability of power transmission.

[0003] Cable terminations, as critical components at the end of cable lines, directly connect cables to external electrical equipment and are often exposed to complex environments such as outdoors and industrial plants. Their impact resistance is a crucial safeguard for ensuring safe power transmission. However, due to the lack of suitable external protective devices for existing cable terminations, they are highly susceptible to stress cone cracks, flange deformation, and sealing ring detachment when subjected to impacts such as falling objects, construction collisions, or hail. This can lead to electric field distortion, insulation leakage, or the intrusion of external moisture and impurities, ultimately resulting in partial discharge, insulation breakdown, and serious electrical accidents such as short circuits and fires.

[0004] Therefore, it is necessary to invent a cable terminal joint structure based on cross-linked polyethylene to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a cable termination joint structure based on cross-linked polyethylene, thereby resolving the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cable termination joint structure based on cross-linked polyethylene, comprising: An insulating copper shell protective box, wherein the insulating copper shell protective box is cylindrical in shape and both ends of the insulating copper shell protective box are symmetrically connected with sealing tubes; The conductor connecting tube, located at the axis of the insulating copper shell protective box, is used to realize the electrical connection between the internal conductor of the cable and the conductor at the mating end; Insulating prefabricated components are evenly arranged between the conductor connecting pipe and the insulating copper shell protective box to protect the conductor connecting pipe; An equalizing sleeve is located at the center of the left end of the conductor connecting tube to improve the electric field distribution; The protective device includes a protective tube, a fixing component, and a shock-absorbing component. The protective tube is sleeved on the outside of the insulating copper shell protective box, and the length of the protective tube matches the length of the insulating copper shell protective box. The fixing component is connected to the middle of the inner side of the protective tube and is used to fix the protective tube to the insulating copper shell protective box. The shock-absorbing component is symmetrically arranged on both sides of the fixing component and is used to absorb the impact of the external environment on the protective tube.

[0007] Furthermore, the fixing assembly includes a fixed ring, a movable ring, limiting rods, and a positioning mechanism. The fixed ring is slidably sleeved on the outside of the insulating copper shell protective box, and the outer surface of the fixed ring is spherical. The movable ring is rotatably sleeved on the outside of the fixed ring, and the movable ring can deflect at any angle around the center point of the fixed ring. An annular groove coaxial with the fixed ring is formed on the inner wall of the insulating copper shell protective box, and the movable ring is slidably installed in the annular groove. There are multiple limiting rods, which are evenly slidably inserted into the movable ring along both sides, and the two ends of the limiting rods are fixedly connected to the inner walls of the annular groove on both sides. The positioning mechanism is symmetrically connected to both sides of the movable ring for locking the position of the movable ring.

[0008] Furthermore, the positioning mechanism includes a fixing block, a locking screw, and a rubber pad. The fixing block is fixedly connected to the side of the movable ring. The locking screw is threaded through and inserted into the fixing block along the diameter of the protective tube, and the top of the locking screw never contacts the inner wall of the protective tube. The rubber pad is rotatably connected to the end of the locking screw near the insulating copper shell protective box, and the rubber pad can fit against the surface of the insulating copper shell protective box. The surface of the protective tube has through-holes matching the number of locking screws. In the initial state, multiple operating holes are aligned with multiple locking screws, and the diameter of the operating holes is larger than the diameter of the locking screws.

[0009] Furthermore, the shock absorption assembly includes a first shock absorption spring, an annular protrusion, and a support mechanism. The first shock absorption spring is symmetrically sleeved on the limiting rod, and there are two first shock absorption springs on the same limiting rod. The two first shock absorption springs are symmetrical about the movable ring, and the two ends of the first shock absorption springs are fixedly connected to the movable ring and the side wall of the annular groove, respectively. The annular protrusion is coaxial with the protective tube, and there are two annular protrusions. The two annular protrusions are symmetrically distributed on both sides of the movable ring, and the annular protrusions are fixedly connected to the inner wall of the protective tube. There are multiple support mechanisms, and the multiple support mechanisms are evenly distributed in annularly on the inner wall of the annular protrusion, which are used to keep the protective tube and the insulating copper shell protective box coaxial in the initial state.

[0010] Furthermore, the support mechanism includes a top rod, a ball bearing, and a second shock-absorbing spring. The top rod is vertically slidably inserted into the inner wall of the annular protrusion. The ball bearing is rotatably installed at one end of the top rod near the insulating copper shell protective box. The second shock-absorbing spring is fixedly connected to the other end of the top rod, and the end of the second shock-absorbing spring away from the top rod is fixedly connected to the inside of the annular protrusion.

[0011] Furthermore, the ball bearings on the top rod are always in close contact with the surface of the insulating copper shell protective box under the action of the second shock-absorbing spring, and the length of the top rod extending out of the inner side of the annular protrusion is greater than the maximum deflection distance of the movable ring.

[0012] Furthermore, the inner diameter of the fixing ring matches the outer diameter of the insulating copper shell protective box, and tapered guide rings are symmetrically fixedly connected to both sides of the fixing ring, with the diameter of the guide rings gradually increasing away from the fixing ring.

[0013] Furthermore, the internal structures of the insulating copper shell protective box are filled with a waterproofing agent, and the surface of the insulating copper shell protective box is provided with a liquid inlet hole for filling, and a sealing cap is installed at the liquid inlet hole.

[0014] Furthermore, the two ends of the protective tube are inclined towards the insulating copper shell protective box to form a conical surface, and the diameter of the end of the protective tube is larger than the outer diameter of the insulating copper shell protective box. Several protruding strips are axially and uniformly fixedly connected to the outer side of the protective tube.

[0015] The technical effects and advantages of this invention are as follows: This invention incorporates a protective device. When subjected to falling objects, hail, or construction impacts, the outer convex strip of the protective pipe first absorbs energy through deformation. Axial impacts are converted into elastic potential energy by the first damping spring, while radial high-frequency impacts are mitigated by the second damping spring through the cooperation of the push rod and ball bearings. Ultimately, this reduces the efficiency of impact load transmission, effectively preventing damage such as internal stress cone cracks and pressure equalization sleeve displacement, and eliminating accidents such as electric field distortion and insulation breakdown caused by impacts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention after the installation of the cable; Figure 2 This is a three-dimensional sectional view of the protective tube in this invention; Figure 3 In this invention Figure 2 Enlarged view of part A; Figure 4 This is a three-dimensional schematic diagram of the fixing component and guide ring in this invention; Figure 5 This is a partial perspective sectional view of the insulating copper shell protective box, conductor connecting pipe and insulating prefabricated component in this invention. Figure 6In this invention Figure 5 Enlarged view of part B.

[0017] In the diagram: 1. Insulating copper shell protective box; 2. Sealing tube; 3. Conductor connecting tube; 4. Insulating prefabricated component; 5. Equalizing sleeve; 6. Protective tube; 7. Fixing ring; 8. Moving ring; 9. Limiting rod; 10. Annular groove; 11. Fixing block; 12. Locking screw; 13. Rubber pad; 14. Operating hole; 15. First shock-absorbing spring; 16. Annular protrusion; 17. Top rod; 18. Ball bearing; 19. Second shock-absorbing spring; 20. Guide ring; 21. Sealing cover; 22. Raised strip. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0019] This invention provides, for example Figures 1 to 6 The cable termination joint structure based on cross-linked polyethylene shown includes: an insulating copper shell protective box 1, a conductor connecting tube 3, an insulating prefabricated component 4, an equalizing sleeve 5, and a protective device; the insulating copper shell protective box 1 is cylindrical in shape and made of high-purity electrolytic copper, which has both excellent mechanical strength and thermal conductivity. Both ends of the insulating copper shell protective box 1 are symmetrically connected to sealing tubes 2. The sealing tubes 2 are made of elastic silicone rubber or ethylene propylene rubber and are fitted onto a pull-out plastic spiral support tube at the factory. They are soft and highly elastic. During installation, the support tube is simply pulled out, and the rubber components will adhere tightly to the surface of the cable insulation layer due to their own elasticity; the conductor connecting tube 3 is located at the axis of the insulating copper shell protective box 1 and is made of copper with anti-slip texture on the inner wall. Its two ends are respectively crimped and fixed to the internal conductor of the cable and the conductor at the connection end, such as the overhead line conductor. After applying the rated pressure with a crimping tool, a low-resistance, high-stability electrical connection between the conductors can be achieved, avoiding local overheating during current transmission. The insulation prefabricated component 4 is uniformly set between the conductor connecting tube 3 and the insulating copper shell protection box 1. It is made of cross-linked polyethylene material, which is consistent with the insulation layer material of the cable body, ensuring the continuity of insulation performance. The insulation prefabricated component 4 is molded, with uniform thickness and no air bubbles or impurities. It can effectively block the leakage path between the conductor connecting tube 3 and the insulating copper shell protection box 1, while buffering the thermal shock of the conductor heating to the box. The equalizing sleeve 5 is set at the axis of the left end of the conductor connecting tube 3. It is made of high-temperature vulcanized silicone rubber, and the inner wall is designed with a conical structure adapted to the conductor connecting tube 3. Its function is to improve the electric field distribution at the conductor end, avoid excessive local field strength caused by the concentration of electric field at the conductor edge, reduce the risk of partial discharge, and adapt to the insulation requirements of voltage levels of 10kV-35kV. The protective device includes a protective tube 6, a fixing component, and a shock-absorbing component. The protective tube 6 is sleeved on the outside of the insulating copper shell protective box 1, and the length of the protective tube 6 matches the length of the insulating copper shell protective box 1. The fixing component is connected to the middle of the inner side of the protective tube 6 to fix the protective tube 6 to the insulating copper shell protective box 1. The shock-absorbing component is symmetrically arranged on both sides of the fixing component to absorb the impact of the external environment on the protective tube 6. The internal structure of the insulating copper shell protective box 1 is filled with a waterproofing agent to improve the waterproofing effect of the insulating copper shell protective box 1 on the internal connecting cables. The surface of the insulating copper shell protective box 1 is provided with a liquid inlet hole for filling the waterproofing agent. A sealing cap 21 is installed at the liquid inlet hole. After the insulating copper shell protective box 1 is installed on the cable terminal, the protective tube 6 is sleeved on the outside of the insulating copper shell protective box 1. Then, the position of the protective tube 6 is locked by the fixing component. After the protective tube 6 is connected, the cable terminal is connected to the circuit. Epoxy resin-based waterproofing agent is injected into the inside through the liquid inlet hole of the insulating copper shell protective box 1. After curing, it fills all the tiny gaps and forms a complete sealing layer. Externally, it relies on the water-guiding conical surface of the protective tube 6, the elastic fit of the sealing tube 2 in close contact with the cable insulation layer, and the indirect sealing of the support mechanism ball bearing 18 for multiple protections. It can be used for a long time in harsh environments such as humidity, rain, and condensation, avoiding problems such as conductor corrosion and insulation performance degradation. During use, when the protective pipe 6 is subjected to external impacts such as falling objects or hail, the shock-absorbing components inside the protective pipe 6 can absorb the vibration, thereby converting the vibration received by the protective pipe 6 into the internal energy of the shock-absorbing components, thus reducing the impact of the impact on the cable terminal and ensuring the normal use of the cable terminal.

[0020] like Figures 2 to 4 As shown, the fixing assembly includes a fixed ring 7, a movable ring 8, a limiting rod 9, and a positioning mechanism. The fixed ring 7 is slidably sleeved on the outside of the insulating copper shell protective box 1, and the outer surface of the fixed ring 7 is spherical. The movable ring 8 is rotatably sleeved on the outside of the fixed ring 7, and the movable ring 8 can deflect at any angle around the center point of the fixed ring 7. An annular groove 10 coaxial with the fixed ring 7 is provided on the inner wall of the insulating copper shell protective box 1. The movable ring 8 is slidably installed in the annular groove 10. There are multiple limiting rods 9, which are evenly slidably inserted into the movable ring 8 along both sides. The two ends of the limiting rods 9 are fixedly connected to the inner walls of the annular groove 10 on both sides. The positioning mechanism is symmetrically connected to both sides of the movable ring 8 to lock the position of the movable ring 8. The positioning mechanism includes a fixing block 11, a locking screw 12, and a rubber pad 13. The fixing block 11 is fixedly connected to the side of the movable ring 8. The locking screw 12 is threaded through and inserted into the fixing block 11 along the diameter direction of the protective tube 6, and the top of the locking screw 12 never contacts the inner wall of the protective tube 6. The rubber pad 13 is rotatably connected to the end of the locking screw 12 near the insulating copper shell protective box 1, and the rubber pad 13 can fit against the surface of the insulating copper shell protective box 1. The surface of the protective tube 6 is provided with operating holes 14 that match the number of locking screws 12. In the initial state, multiple operating holes 14 are directly opposite multiple locking screws 12, and the diameter of the operating holes 14 is larger than the diameter of the locking screws 12. Before installing the protective tube 6, the end of the locking screw 12 furthest from the rubber pad 13 can be partially inserted into the operating hole 14. This ensures that the position of the retaining ring 7 remains relatively fixed under the constraint of the operating hole 14 on the locking screw 12 during the installation of the protective tube 6, preventing the retaining ring 7 from changing position due to obstruction at the cable terminal end during installation. During installation, the protective tube 6 is slipped onto the cable terminal from the end of the cable terminal. As the protective tube 6 is gradually slipped on, the retaining ring 7 is also gradually slipped onto the cable terminal. When the protective tube 6 is slipped onto the cable terminal... After the designated position is reached, a screwdriver can be used to tighten multiple locking screws 12 sequentially through each operating hole 14. As the locking screws 12 are tightened, the rubber pads 13 at the ends of the locking screws 12 can be pressed against the outer wall of the insulating copper shell protective box 1. Thus, the position of the fixing ring 7 is locked by the friction between the rubber pads 13 and the insulating copper shell protective box 1, and the protective tube 6 is also positioned in the current position. At the same time, the end of the locking screw 12 away from the rubber pads 13 is completely inserted into the inside of the protective tube 6, so it is no longer restricted by the operating holes 14.

[0021] like Figure 2 and Figure 3 As shown, the shock absorption assembly includes a first shock absorption spring 15, an annular protrusion 16, and a support mechanism. The first shock absorption spring 15 is symmetrically sleeved on the limiting rod 9, and there are two first shock absorption springs 15 on the same limiting rod 9. The two first shock absorption springs 15 are symmetrical about the movable ring 8. The two ends of the first shock absorption spring 15 are fixedly connected to the side wall of the movable ring 8 and the annular slide groove 10, respectively. The annular protrusion 16 is coaxial with the protective tube 6, and there are two annular protrusions 16. The two annular protrusions 16 are symmetrically distributed on both sides of the movable ring 8, and the annular protrusions 16 are fixedly connected to the inner wall of the protective tube 6. There are multiple support mechanisms, and the multiple support mechanisms are evenly distributed in annularly on the inner wall of the annular protrusion 16. They are used to keep the protective tube 6 and the insulating copper shell protective box 1 coaxial in the initial state. The support mechanism includes a top rod 17, a ball bearing 18, and a second damping spring 19. The top rod 17 is vertically slidably inserted into the inner wall of the annular protrusion 16. The ball bearing 18 is rotatably mounted on one end of the top rod 17 near the insulating copper shell protective box 1. The second damping spring 19 is fixedly connected to the other end of the top rod 17, and the end of the second damping spring 19 away from the top rod 17 is fixedly connected to the inside of the annular protrusion 16. The ball bearing 18 on the top rod 17 can always be in close contact with the surface of the insulating copper shell protective box 1 under the action of the second damping spring 19, and the length of the top rod 17 extending out of the inner side of the annular protrusion 16 is greater than the maximum deflection distance of the movable ring 8. During use, when the protective tube 6 is subjected to external impact, when the impact force acts on the outer wall of the protective tube 6, the tangential force along the circumferential surface of the protective tube 6 can drive the protective tube 6 to rotate at a certain angle, thereby converting part of the impact force into the power of the protective tube 6 when rotating, and achieving first-level shock absorption. The impact force along the axial direction of the protective tube 6 can drive the protective tube 6 to move along the direction of the limiting rod 9. As the protective tube 6 moves, the movable ring 8 can compress or stretch the first damping spring 15 under the action of the protective tube 6, thereby converting the impact force on the protective tube 6 along the axial direction into the elastic potential energy of the first damping spring 15, thus achieving secondary damping. In addition, since the protective tube 6 can drive the movable ring 8 to deflect along the spherical surface of the fixed ring 7, when the protective tube 6 is impacted, the protective tube 6 can also rotate around the fixed ring 7 at any angle. At this time, the second damping spring 19 of the support mechanism absorbs the high-frequency micro impact through extension and contraction, and realizes three-level damping. The above triple damping design can reduce the impact load transmission efficiency and protect the cable terminal and structure inside the protective tube 6 from damage. By incorporating ball bearings 18, the friction between the push rod 17 and the surface of the insulating copper shell protective box 1 is reduced when the protective tube 6 deflects or moves, allowing the protective tube 6 to deflect or move more smoothly.

[0022] like Figure 2 and Figure 4 As shown, the inner diameter of the fixing ring 7 matches the outer diameter of the insulating copper shell protective box 1. Conical guide rings 20 are symmetrically fixed on both sides of the fixing ring 7, and the diameter of the guide rings 20 gradually increases in the direction away from the fixing ring 7. During the installation of the protective tube 6, since the fixing ring 7 is inside the protective tube 6, the fixing ring 7 may be stuck by the end of the cable terminal during the installation process, making it inconvenient to install. At this time, the guide ring 20 is provided. The tapered and wide-mouth design of the guide ring 20 can guide the end of the cable terminal and improve the convenience of installing the fixing ring 7.

[0023] like Figure 1 and Figure 2As shown, the two ends of the protective tube 6 are inclined towards the insulating copper shell protective box 1 to form a conical surface, and the diameter of the end of the protective tube 6 is larger than the outer diameter of the insulating copper shell protective box 1. Several protrusions 22 are axially and uniformly fixedly connected to the outer side of the protective tube 6. By providing the protrusion 22, when the protective tube 6 is subjected to external impact, the protrusion 22 on the outer side of the protective tube 6 can first deform, thereby initially absorbing the impact energy. Secondly, as the protrusion 22 is hit, the protrusion 22 can also better drive the protective tube 6 to rotate under the action of the impact force, thereby facilitating the separation of the impacting object from the outer wall of the protective tube 6.

[0024] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A cable termination joint structure based on cross-linked polyethylene, characterized in that, include: An insulating copper shell protective box (1) is cylindrical in shape, and both ends of the insulating copper shell protective box (1) are symmetrically connected with sealing tubes (2). The conductor connecting tube (3) is located at the axis of the insulating copper shell protective box (1) and is used to realize the electrical connection between the internal conductor of the cable and the conductor of the mating end; Insulating prefabricated components (4) are evenly arranged between the conductor connecting pipe (3) and the insulating copper shell protective box (1) to protect the conductor connecting pipe (3); An equalizing sleeve (5) is provided at the center of the left end of the conductor connecting pipe (3) to improve the electric field distribution; The protective device includes a protective tube (6), a fixing component, and a shock-absorbing component. The protective tube (6) is sleeved on the outside of the insulating copper shell protective box (1), and the length of the protective tube (6) matches the length of the insulating copper shell protective box (1). The fixing component is connected to the middle of the inner side of the protective tube (6) to fix the protective tube (6) on the insulating copper shell protective box (1). The shock-absorbing component is symmetrically arranged on both sides of the fixing component to absorb the impact of the external environment on the protective tube (6).

2. The cable termination joint structure based on cross-linked polyethylene according to claim 1, characterized in that: The fixing assembly includes a fixed ring (7), a movable ring (8), a limiting rod (9), and a positioning mechanism. The fixed ring (7) is slidably sleeved on the outside of the insulating copper shell protective box (1), and the outer surface of the fixed ring (7) is spherical. The movable ring (8) is rotatably sleeved on the outside of the fixed ring (7), and the movable ring (8) can deflect at any angle around the center point of the fixed ring (7). An annular groove (10) coaxial with the inner wall of the insulating copper shell protective box (1) is provided. The movable ring (8) is slidably installed in the annular groove (10). There are multiple limiting rods (9). Multiple limiting rods (9) are evenly slidably inserted into the movable ring (8) along both sides, and the two ends of the limiting rods (9) are fixedly connected to the inner walls of both sides of the annular groove (10). The positioning mechanism is symmetrically connected to both sides of the movable ring (8) to lock the position of the movable ring (8).

3. The cable termination joint structure based on cross-linked polyethylene according to claim 2, characterized in that: The positioning mechanism includes a fixing block (11), a locking screw (12), and a rubber pad (13). The fixing block (11) is fixedly connected to the side of the movable ring (8). The locking screw (12) is threaded through and inserted into the fixing block (11) along the diameter direction of the protective tube (6), and the top of the locking screw (12) never contacts the inner wall of the protective tube (6). The rubber pad (13) is rotatably connected to the end of the locking screw (12) near the insulating copper shell protective box (1), and the rubber pad (13) can fit against the surface of the insulating copper shell protective box (1). The surface of the protective tube (6) is provided with operating holes (14) matching the number of locking screws (12). In the initial state, multiple operating holes (14) are directly opposite multiple locking screws (12), and the diameter of the operating holes (14) is larger than the diameter of the locking screws (12).

4. The cable termination joint structure based on cross-linked polyethylene according to claim 3, characterized in that: The shock absorption assembly includes a first shock absorption spring (15), an annular protrusion (16), and a support mechanism. The first shock absorption spring (15) is symmetrically sleeved on the limiting rod (9), and there are two first shock absorption springs (15) on the same limiting rod (9). The two first shock absorption springs (15) are symmetrical about the movable ring (8). The two ends of the first shock absorption spring (15) are fixedly connected to the side wall of the movable ring (8) and the annular groove (10), respectively. The annular protrusion (16) is coaxial with the protective tube (6), and there are two annular protrusions (16). The two annular protrusions (16) are symmetrically distributed on both sides of the movable ring (8), and the annular protrusions (16) are fixedly connected to the inner wall of the protective tube (6). There are multiple support mechanisms. The multiple support mechanisms are evenly distributed in annularly on the inner wall of the annular protrusion (16) to keep the protective tube (6) and the insulating copper shell protective box (1) coaxial in the initial state.

5. The cable termination joint structure based on cross-linked polyethylene according to claim 4, characterized in that: The support mechanism includes a top rod (17), a ball bearing (18), and a second shock-absorbing spring (19). The top rod (17) is vertically slidably inserted into the inner wall of the annular protrusion (16). The ball bearing (18) is rotatably installed at one end of the top rod (17) near the insulating copper shell protective box (1). The second shock-absorbing spring (19) is fixedly connected to the other end of the top rod (17), and the end of the second shock-absorbing spring (19) away from the top rod (17) is fixedly connected to the inside of the annular protrusion (16).

6. The cable termination joint structure based on cross-linked polyethylene according to claim 5, characterized in that: The ball bearing (18) on the top rod (17) can always be in close contact with the surface of the insulating copper shell protective box (1) under the action of the second shock-absorbing spring (19), and the length of the top rod (17) extending out of the inner side of the annular protrusion (16) is greater than the maximum deflection distance of the movable ring (8).

7. The cable termination joint structure based on cross-linked polyethylene according to claim 6, characterized in that: The inner diameter of the fixing ring (7) matches the outer diameter of the insulating copper shell protective box (1). Both sides of the fixing ring (7) are symmetrically fixed with tapered guide rings (20), and the diameter of the guide rings (20) gradually increases in the direction away from the fixing ring (7).

8. The cable termination joint structure based on cross-linked polyethylene according to claim 7, characterized in that: The insulating copper shell protective box (1) is filled with waterproof casting agent between its internal structures, and the surface of the insulating copper shell protective box (1) is provided with a liquid inlet hole for filling, and a sealing cap (21) is installed at the liquid inlet hole.

9. The cable termination joint structure based on cross-linked polyethylene according to claim 8, characterized in that: The two ends of the protective tube (6) are inclined towards the insulating copper shell protective box (1) to form a conical surface, and the diameter of the end of the protective tube (6) is greater than the outer diameter of the insulating copper shell protective box (1). Several protrusions (22) are uniformly fixedly connected to the outer side of the protective tube (6).

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