A double-sheathed ultra-high voltage cable and its manufacturing method

Abstract

This invention discloses a double-sheathed ultra-high voltage cable and its manufacturing method, relating to the field of cable technology. It includes two conductors, each with an insulation layer sleeved on its outer side, and an inner bushing sleeved on the outer side of each insulation layer. A docking clamping mechanism is provided on the outer side of each of the two inner bushings. The docking clamping mechanism includes splicing rings, with splicing rings sleeved on the outer side of each of the two inner bushings. An annular sealing plate is snapped onto the opposite end of each of the two splicing rings. This invention has a scientifically sound and reasonable structure, is safe and convenient to use, and features a docking clamping mechanism. Through the cooperation of the anti-drop ring and the inner sleeve, the splicing ring and the annular sealing plate can be clamped and fixed, preventing loosening or falling off. Then, three arc-shaped splicing frames and three anti-deviation outer pads are easily wrapped and overlapped between the two annular sealing plates using annular Velcro, encasing the docked conductors, sealing them, and improving the stability of the docking.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a double-sheathed ultra-high voltage cable and its manufacturing method. Background Technology

[0002] With the rapid development of modern industry and the continuous improvement of people's living standards, the demand for electricity is increasing. The insufficient supply of power energy has become one of the important factors restricting the sustained and rapid development of my country's national economy. Therefore, it is imperative to develop high-voltage power transmission and improve the voltage level of transmission lines. For example, a flat aluminum sheathed high-voltage and ultra-high-voltage cable is disclosed, with application number CN202120441481.5. This patent adopts a double-layer design of galvanized steel wire armor layer and flat aluminum sheath, which makes the cable have better load-bearing capacity.

[0003] However, when two cables need to be connected, without reinforcement, they are prone to breakage and separation under tensile force, affecting the connection effect. Furthermore, the sealing and protection of the connection are insufficient, making it susceptible to interference from the external environment. Therefore, to avoid the above-mentioned technical problems, it is indeed necessary to provide a double-sheathed ultra-high voltage cable and its manufacturing method to overcome the defects in the prior art. Summary of the Invention

[0004] This invention provides a double-sheathed ultra-high voltage cable and its manufacturing method, which can effectively solve the problems mentioned in the background art, such as the lack of reinforcement when two cables need to be connected, which easily leads to breakage and separation under tensile force, affecting the connection effect, and the insufficient sealing and protection of the connection, making it susceptible to interference from the external environment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a double-sheathed ultra-high voltage cable, comprising two conductors, both of which are fitted with an insulation layer on their outer sides, and an inner liner fitted on the outer side of the insulation layer;

[0006] The two inner bushings are provided with a docking clamping mechanism on their outer sides, and the docking clamping mechanism includes a splicing collar;

[0007] Both inner bushings are fitted with splicing collars on their outer sides, and annular sealing plates are snapped onto opposite ends of the two splicing collars. Connecting rods are connected to the inside of the annular sealing plates by threads at equal intervals, and driven gears are fixedly fitted onto the outer sides of the connecting rods.

[0008] One end of the connecting rod is connected to a traction collar, and a limit ring cover is rotatably connected to the outside of the traction collar. A drive gear ring is engaged with the inner wall of the limit ring cover.

[0009] An arc-shaped splicing frame is installed at equal intervals between the two annular sealing plates, and the interior of the arc-shaped splicing frame is filled with a waterproof and heat-insulating layer;

[0010] An anti-deviation outer pad is equidistantly engaged between the two annular sealing plates. Both ends of the anti-deviation outer pad are engaged with splicing sockets. Annular Velcro is installed on the outer side of the anti-deviation outer pad and the outer side of the arc-shaped splicing frame.

[0011] According to the above technical solution, the inner wall of the limiting ring cover is fitted to the outer side of the annular sealing plate, the splicing socket has a screw hole inside, and one end of the connecting rod is embedded in the screw hole. The outer side of the connecting rod is connected to the inner wall of the screw hole by a thread, and the inner wall of the anti-deviation outer pad is fitted with a protrusion.

[0012] According to the above technical solution, arc-shaped slots are provided at equal intervals on the outer sides of the two splicing collars, and an insertion block is engaged at the position inside the arc-shaped slot on the inner wall of the arc splicing frame. An anti-drop ring is threadedly engaged on the outer side of the inner liner at the position on one side of the splicing collar.

[0013] The arc-shaped splicing frame is symmetrically fitted with storage sleeves, and the storage sleeves are fitted with supporting clamping springs. One end of the supporting clamping spring is fitted with a push rod, and one end of each of the two push rods located on the same horizontal line is fitted with a clamping arc plate.

[0014] According to the above technical solution, one end of the insertion block is embedded in the arc-shaped slot, the outer side of the anti-drop ring is in contact with the inner wall of the arc-shaped splicing frame, and one end of the storage sleeve penetrates the inner wall of the waterproof and heat-insulating layer and the inner wall of the arc-shaped splicing frame.

[0015] According to the above technical solution, a positioning and reinforcing sealing mechanism is provided on the outer side of the two inner bushings, and the positioning and reinforcing sealing mechanism includes an inner sleeve;

[0016] Both inner sleeves are fitted with inner sleeves on their outer sides, and both inner sleeves are fitted with outer sleeves on their outer sides. Support rings are equidistantly engaged between the inner sleeves and the outer sleeves. A flame-retardant layer is filled between two adjacent support rings on the inner wall of the outer sleeve.

[0017] The support ring is fitted with a reinforcing rib tube, and the annular sealing plate is threadedly connected to a positioning screw on one side of the reinforcing rib tube.

[0018] Both outer sleeves are fitted with outer bushings, and each of the two outer bushings has a positioning and mounting ring fixedly fitted at an adjacent end on its outer side. Each of the two positioning and mounting rings has a splicing pad symmetrically snapped onto its outer side.

[0019] Positioning clamps are fitted at the top and bottom of the outer sides of the two positioning mounting rings, and positioning pins are symmetrically connected between the two opposing positioning clamps by threads.

[0020] A waterproof sleeve is snapped between each of the two positioning clamps located on the same horizontal plane, and a waterproof adhesive is installed between the two waterproof sleeves.

[0021] According to the above technical solution, one end of the positioning screw is embedded inside the reinforcing tube, and the outer side of the positioning screw is connected to the inner wall of the reinforcing tube by a thread. One end of the reinforcing tube penetrates one end of the flame-retardant layer.

[0022] According to the above technical solution, the outer side of the positioning mounting ring is provided with an embedding groove, the inner wall of the positioning clamp is fitted with a locking block at the position corresponding to the inside of the embedding groove, the splicing pad is provided with a through hole, and the bottom end of the positioning pin passes through the bottom end of the through hole.

[0023] According to the above technical solution, a method for manufacturing a double-sheathed ultra-high voltage cable includes the following steps:

[0024] S1. Prepare conductors and install insulation: Prepare two conductors and attach insulation to their outer sides, followed by attaching the inner bushing.

[0025] S2. Install the docking clamping mechanism: Set up a splicing collar and annular sealing plate, clamp and fix it by anti-drop ring and inner sleeve, and further reinforce it with positioning screw to ensure stable connection;

[0026] S3. Install traction and limiting devices: Connect the traction collar and the limiting ring cover inside the annular sealing plate to ensure smooth meshing between the drive gear ring and the driven gear;

[0027] S4. Fix the anti-deviation outer pad and splicing frame: Connect the splicing socket and the connecting rod with threads, and fix the anti-deviation outer pad and the arc-shaped splicing frame with ring Velcro;

[0028] S5. Fill with waterproof and heat-insulating layer and install support device: Fill the arc-shaped splicing frame with waterproof and heat-insulating layer, and install support clamping spring and push rod.

[0029] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use.

[0030] 1. A docking clamping mechanism is set up. Through the cooperation of the anti-drop ring and the inner sleeve, the splicing ring and the annular sealing plate can be clamped and fixed to prevent loosening or falling off. Then, the three arc-shaped splicing frames and three anti-deviation outer pads can be overlapped and wrapped between the two annular sealing plates by the ring Velcro to wrap the docking conductors and seal them. At the same time, the waterproof and heat insulation layer inside the arc-shaped splicing frame improves the waterproof and heat insulation effect and reduces the impact of the external environment on the internal conductors.

[0031] The connecting rod is rotated by the cooperation of the limiting ring cover, the drive gear ring and the driven gear, so that the connecting rod spirals into the splicing socket, which improves the fixing effect of the anti-deviation outer pad and ensures its limiting of the arc splicing frame. At the same time, the movement of the connecting rod drives the traction collar and the limiting ring cover to move, covering and limiting the splicing socket, further improving stability and preventing the phenomenon of falling off.

[0032] By utilizing the internal support clamping spring, push rod, and clamping arc plate of the storage sleeve, the two conductors can be clamped and fixed during docking, improving the stability of the docking. When subjected to tension, the clamping arc plate, arc splicing frame, and anti-deviation outer pad disperse the stress points, increasing the tensile force that the docking joint can withstand and preventing breakage.

[0033] 2. A positioning and reinforcement sealing mechanism is set up. Through the cooperation of the inner and outer sleeves, multiple layers of protection are formed on the outside of the conductor, which improves the protection effect. At the same time, the outer sleeve is filled with a support ring and a flame-retardant layer, which further increases the compressive strength and flame-retardant effect, and improves the service life.

[0034] In addition, the flame-retardant layer is further supported by the reinforcing tubes, which enhances its toughness. At the same time, it can cooperate with the positioning screw, so that the positioning screw is spirally embedded inside the reinforcing tube, which further improves the fixing effect of the splicing collar and the annular sealing plate, ensuring its stability on the inner bushing 3, and providing convenience for subsequent docking and positioning.

[0035] The use of positioning pins and splicing pads facilitates the alignment and splicing of two opposing positioning clamps on the outside of the positioning installation ring, thereby aligning and splicing the two waterproof sleeves together. Waterproof adhesive is then used for bonding and fixing, reducing gaps and making it easier to seal and wrap the joint of the two cables. This further improves sealing and tensile strength, prevents rainwater from entering, and reduces the occurrence of leakage.

[0036] In summary, the combination of the clamping mechanism and the positioning and reinforcing sealing mechanism provides comprehensive and multi-layered reliable protection and a stable connection for the cable joint. When subjected to tensile force, it can evenly distribute the force, increasing the tensile strength of the joint and preventing the risk of loosening or detachment. Simultaneously, it can seal and wrap the connection, enhancing waterproof and thermal insulation performance, effectively preventing rainwater infiltration and reducing interference from the external environment on the internal conductors. Furthermore, the modular and standardized design of each component facilitates on-site installation and replacement, significantly improving the quality, durability, and safety of cable splicing projects, making it suitable for complex and demanding application environments. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0038] In the attached diagram:

[0039] Figure 1 This is a schematic diagram of the structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the installation structure of the waterproof sleeve of the present invention;

[0041] Figure 3 This is a schematic diagram of the installation structure of the ring-shaped hook and loop fastener of the present invention;

[0042] Figure 4 This is a schematic diagram of the docking and clamping mechanism of the present invention;

[0043] Figure 5 This is a schematic diagram of the installation structure of the support ring of the present invention;

[0044] Figure 6 This is a schematic diagram of the installation structure of the splicing pad block of the present invention;

[0045] Figure 7 This is a schematic diagram of the filling structure of the flame-retardant layer of the present invention;

[0046] Figure 8 This is a schematic diagram of the positioning and reinforcement sealing mechanism of the present invention.

[0047] The diagram labels are: 1. Conductor; 2. Insulating layer; 3. Inner bushing.

[0048] 4. Docking and clamping mechanism; 401. Splicing collar; 402. Annular sealing plate; 403. Connecting rod; 404. Driven gear; 405. Traction collar; 406. Limiting ring cover; 407. Drive gear ring; 408. Arc-shaped splicing frame; 409. Waterproof and heat-insulating layer; 410. Anti-deviation outer pad; 411. Splicing socket; 412. Arc-shaped slot; 413. Insertion block; 414. Anti-drop ring; 415. Storage sleeve; 416. Supporting clamping spring; 417. Push rod; 418. Clamping arc plate; 419. Annular Velcro;

[0049] 5. Positioning and reinforcement sealing mechanism; 501. Inner sleeve; 502. Outer sleeve; 503. Support ring; 504. Flame retardant layer; 505. Reinforcing rib tube; 506. Positioning screw; 507. Outer bushing; 508. Positioning mounting ring; 509. Splicing pad; 510. Positioning clamp; 511. Positioning pin; 512. Waterproof sleeve; 513. Waterproof adhesive. Detailed Implementation

[0050] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0051] Example: Figure 1-8 As shown, the present invention provides a technical solution: a double-sheathed ultra-high voltage cable, comprising two conductors 1, each conductor 1 having an insulation layer 2 sleeved on its outer side, and an inner liner 3 sleeved on the outer side of the insulation layer 2.

[0052] The two inner bushings 3 are provided with docking clamping mechanisms 4 on their outer sides;

[0053] The docking clamping mechanism 4 includes a splicing collar 401, an annular sealing plate 402, a connecting rod 403, a driven gear 404, a traction collar 405, a limiting ring cover 406, a driving gear ring 407, an arc-shaped splicing frame 408, a waterproof and heat-insulating layer 409, an anti-deviation outer pad 410, a splicing socket 411, an arc-shaped slot 412, an insertion block 413, an anti-drop ring 414, a storage sleeve 415, a supporting clamping spring 416, a pushing rod 417, a clamping arc plate 418, and an annular Velcro 419.

[0054] Two inner bushings 3 are fitted with splicing collars 401 on their outer sides. On opposite ends of the two splicing collars 401, annular sealing plates 402 are snapped into place. Inside the annular sealing plates 402, connecting rods 403 are connected at equal intervals by threads. A driven gear 404 is fixedly fitted onto the outer side of the connecting rods 403.

[0055] One end of the connecting rod 403 is connected to a traction collar 405, and the outer side of the traction collar 405 is rotatably connected to a limit ring cover 406, and a drive gear ring 407 is engaged on the inner wall of the limit ring cover 406.

[0056] An arc-shaped splicing frame 408 is installed at equal intervals between two annular sealing plates 402, and the arc-shaped splicing frame 408 is filled with a waterproof and heat-insulating layer 409.

[0057] Two annular sealing plates 402 are equidistantly connected with anti-deviation outer pads 410. Both ends of the anti-deviation outer pads 410 are connected with splicing sockets 411. Annular Velcro 419 is installed on the outer side of the anti-deviation outer pads 410 and the outer side of the arc-shaped splicing frame 408. In order to facilitate docking, the inner wall of the limiting ring cover 406 fits against the outer side of the annular sealing plates 402. The splicing socket 411 has a screw hole inside, and one end of the connecting rod 403 is embedded in the screw hole. The outer side of the connecting rod 403 is connected to the inner wall of the screw hole by threads, and the inner wall of the anti-deviation outer pads 410 is connected with a protrusion.

[0058] Both splicing collars 401 have arc-shaped slots 412 equidistantly opened on their outer sides, and an insertion block 413 is engaged with the inner wall of the arc-shaped splicing frame 408 at the position corresponding to the inner position of the arc-shaped slot 412. An anti-drop ring 414 is threadedly sleeved on the outer side of the inner liner 3 at the position corresponding to one side of the splicing collar 401.

[0059] The arc-shaped splicing frame 408 has symmetrically fitted storage sleeves 415 inside, and a support clamping spring 416 is fitted inside the storage sleeve 415. One end of the support clamping spring 416 is fitted with a push rod 417. One end of each of the two push rods 417 located on the same horizontal line is fitted with a clamping arc plate 418. In order to prevent the arc-shaped splicing frame 408 from shifting, one end of the insertion block 413 is embedded in the arc-shaped slot 412. The outer side of the anti-drop ring 414 is in contact with the inner wall of the arc-shaped splicing frame 408. One end of the storage sleeve 415 penetrates the inner wall of the waterproof insulation layer 409 and the inner wall of the arc-shaped splicing frame 408.

[0060] The two inner bushings 3 are provided with positioning and reinforcing sealing mechanisms 5 on their outer sides;

[0061] The positioning and reinforcement sealing mechanism 5 includes an inner sleeve 501, an outer sleeve 502, a support ring 503, a flame-retardant layer 504, a reinforcing rib tube 505, a positioning screw 506, an outer bushing 507, a positioning mounting ring 508, a splicing pad 509, a positioning clamp 510, a positioning pin 511, a waterproof sleeve 512, and a waterproof adhesive 513.

[0062] Both inner sleeves 3 are fitted with inner sleeves 501 on their outer sides, and both inner sleeves 501 are fitted with outer sleeves 502 on their outer sides. Support rings 503 are equidistantly engaged between the inner sleeves 501 and the outer sleeves 502. Flame-retardant layer 504 is filled between two adjacent support rings 503 on the inner wall of the outer sleeve 502.

[0063] The support ring 503 has a reinforcing rib tube 505 inside, and the annular sealing plate 402 has a positioning screw 506 threadedly connected to one side of the reinforcing rib tube 505.

[0064] Both outer sleeves 502 are fitted with outer bushings 507. Each of the two outer bushings 507 has a positioning ring 508 fixedly fitted at an adjacent end on the outside. Both positioning rings 508 have splicing pads 509 symmetrically snapped onto the outside. In order to facilitate the fixing of the annular sealing plate 402, one end of the positioning screw 506 is embedded in the interior of the reinforcing tube 505. The outer side of the positioning screw 506 is connected to the inner wall of the reinforcing tube 505 by threads. One end of the reinforcing tube 505 passes through one end of the flame retardant layer 504.

[0065] Positioning clamps 510 are fitted at the top and bottom of the outer sides of the two positioning mounting rings 508, and positioning pins 511 are symmetrically connected between the two opposing positioning clamps 510 by threads.

[0066] A waterproof sleeve 512 is snapped between two positioning clamps 510 located on the same horizontal plane. A waterproof adhesive 513 is installed between the two waterproof sleeves 512. In order to further improve the waterproof sealing, an embedding groove is opened on the outer side of the positioning installation ring 508. A locking block is snapped on the inner wall of the positioning clamp 510 at the position corresponding to the inside of the embedding groove. A through hole is opened inside the splicing pad 509. The bottom end of the positioning pin 511 passes through the bottom end of the through hole.

[0067] According to the above technical solution, a method for manufacturing a double-sheathed ultra-high voltage cable includes the following steps:

[0068] S1. Prepare conductors and install insulation: Prepare two conductors 1 and attach insulation 2 to their outer sides, followed by inner bushing 3.

[0069] S2. Install the docking clamping mechanism: Set up the splicing collar 401 and the annular sealing plate 402, clamp and fix them by the anti-drop ring 414 and the inner sleeve 501, and further reinforce them by the positioning screw 506 to ensure stable connection.

[0070] S3. Install traction and limiting devices: Connect the traction ring 405 and the limiting ring cover 406 inside the annular sealing plate 402 to ensure that the drive gear ring 407 and the driven gear 404 mesh smoothly.

[0071] S4. Fix the anti-deviation outer pad and splicing frame: Connect the splicing socket 411 to the connecting rod 403 by thread, and fix the anti-deviation outer pad 410 to the arc splicing frame 408 with the ring Velcro 419.

[0072] S5. Fill with waterproof and heat-insulating layer and install support device: Fill the arc splicing frame 408 with waterproof and heat-insulating layer 409, and install support clamping spring 416 and push rod 417 to ensure cable stability.

[0073] The working principle and usage process of this invention are as follows: First, during use, the inner sleeve 501 and the outer sleeve 502 cooperate to form a multi-layer protection on the outside of the conductor 1. At the same time, the outer sleeve 502 is filled with a support ring 503 and a flame-retardant layer 504, which improves the strength and flame-retardant effect of the outer sleeve 502. In addition, the flame-retardant layer 504 is further supported by the reinforcing rib tube 505 to improve toughness. Then, the splicing collar 401 and the annular sealing plate 402 are sleeved on the outside of the inner liner 3, and the positioning screw 506 is aligned with the reinforcing rib tube 505, so that the positioning screw 506 can be screwed into the reinforcing rib tube 505 to position the annular sealing plate 402.

[0074] Next, rotate the anti-drop ring 414 so that the anti-drop ring 414 is sleeved on the outside of the inner liner 3 and cooperates with the inner sleeve 501 to clamp and fix the splicing ring 401 and the annular sealing plate 402, which further improves the stability of the splicing ring 401 and the annular sealing plate 402 and prevents loosening or falling off.

[0075] During the connection process, after cutting conductors 1 of appropriate lengths from adjacent ends of the two cables, the two conductors 1 are connected. Then, three arc-shaped splicing frames 408 and three anti-deviation outer pads 410 are overlapped and staggered between two annular sealing plates 402, and fixed by wrapping with annular Velcro 419. This ensures the stability of the arc-shaped splicing frames 408 and the anti-deviation outer pads 410, prevents loosening, and enhances the wrapping effect on the conductors 1.

[0076] In addition, the insertion block 413 on the inner wall of the arc-shaped splicing frame 408 is embedded in the arc-shaped slot 412 to prevent displacement. The rotating limit ring cover 406 drives the drive gear ring 407 to rotate, and the power is transmitted through the driven gear 404, causing the connecting rod 403 to rotate and move along the inside of the annular sealing plate 402. It is then spirally inserted into the splicing sockets 411 at both ends of the anti-deviation outer pad 410 to connect and fix the anti-deviation outer pad 410, further improving the tightness of the splicing between the anti-deviation outer pad 410, the arc-shaped splicing frame 408, the splicing collar 401 and the annular sealing plate 402.

[0077] Meanwhile, during the rotation of the connecting rod 403, the traction collar 405 moves the limiting ring cover 406, forcing the limiting ring cover 406 to move and fit onto the outside of the splicing socket 411, thereby covering and limiting the splicing socket 411. This further improves the stability of the splicing socket 411 and the anti-deviation outer pad 410 between the two annular sealing plates 402, preventing them from falling off. This also improves the positioning effect of the arc splicing frame 408 and realizes the connection of the two cables.

[0078] Next, by utilizing the elasticity of the internal support clamping spring 416 of the storage sleeve 415, the push rod 417 and the clamping arc plate 418 are pushed to move. During docking, the two conductors 1 inside are clamped and fixed, which further improves the docking effect. Thus, when subjected to pulling, the force points can be dispersed, improving the stability of the docking point and preventing breakage.

[0079] When the docking is completed, the two opposite positioning clamps 510 are aligned and spliced ​​on the outside of the positioning installation ring 508 by the cooperation of the positioning pin 511 and the splicing pad 509. This makes it easy to align and splice the two waterproof sleeves 512 together, and to fix them by the waterproof adhesive 513, reducing gaps and making it easy to seal and wrap the docking point, improving the sealing performance, preventing rainwater from entering, and reducing the occurrence of leakage.

[0080] Finally, when not in use, rotate the positioning pin 511 to remove the positioning clamp 510 from the positioning mounting ring 508, thereby removing the waterproof sleeve 512. Then, rotate the limiting ring cover 406 in the opposite direction, and through the cooperation of the drive gear ring 407 and the driven gear 404, transmit power to drive the connecting rod 403 to rotate, remove the splicing socket 411, release the limitation on the anti-deviation outer pad 410, and then remove the annular sealing plate 402 and the anti-deviation outer pad 410 together through the annular Velcro 419 to remove the wrapping of the conductor 1, making it easy to disassemble.

[0081] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-sheathed ultra-high voltage cable, comprising two conductors (1), characterized in that: Both conductors (1) are fitted with an insulating layer (2) on their outer sides, and an inner bushing (3) is fitted on the outer side of the insulating layer (2). The two inner bushings (3) are provided with a docking clamping mechanism (4) on their outer sides, and the docking clamping mechanism (4) includes a splicing collar (401). Both inner sleeves (3) are fitted with splicing collars (401) on their outer sides. Both splicing collars (401) are fitted with annular sealing plates (402) at opposite ends. The annular sealing plates (402) are connected with connecting rods (403) at equal intervals by threads inside. A driven gear (404) is fixedly fitted on the outer side of the connecting rods (403). One end of the connecting rod (403) is connected to a traction collar (405), and a limit ring cover (406) is rotatably connected to the outside of the traction collar (405). A drive gear ring (407) is engaged with the inner wall of the limit ring cover (406). An arc-shaped splicing frame (408) is installed at equal intervals between the two annular sealing plates (402), and the arc-shaped splicing frame (408) is filled with a waterproof and heat-insulating layer (409). An anti-deviation outer pad (410) is equidistantly snapped between the two annular sealing plates (402). Both ends of the anti-deviation outer pad (410) are snapped with splicing sockets (411). Annular Velcro (419) is installed on the outer side of the anti-deviation outer pad (410) and the outer side of the arc splicing frame (408).

2. The double-sheathed ultra-high voltage cable according to claim 1, characterized in that: The inner wall of the limiting ring cover (406) is in contact with the outer side of the annular sealing plate (402). The splicing socket (411) has a screw hole inside, and one end of the connecting rod (403) is embedded in the screw hole. The outer side of the connecting rod (403) is connected to the inner wall of the screw hole by a thread, and the inner wall of the anti-deviation outer pad (410) is fitted with a protrusion.

3. The double-sheathed ultra-high voltage cable according to claim 1, characterized in that: Both of the two splicing collars (401) have arc-shaped slots (412) equidistantly opened on their outer sides, and an insertion block (413) is engaged with the inner wall of the arc-shaped splicing frame (408) at the position corresponding to the inner position of the arc-shaped slot (412). An anti-drop ring (414) is threadedly engaged with the outer side of the inner liner (3) at the position corresponding to one side of the splicing collar (401). The arc-shaped splicing frame (408) is symmetrically fitted with a storage sleeve (415), and a support clamping spring (416) is fitted inside the storage sleeve (415). One end of the support clamping spring (416) is fitted with a push rod (417), and one end of each of the two push rods (417) located on the same horizontal line is fitted with a clamping arc plate (418).

4. The double-sheathed ultra-high voltage cable according to claim 3, characterized in that: One end of the insertion block (413) is embedded inside the arc-shaped slot (412), the outer side of the anti-drop ring (414) is in contact with the inner wall of the arc-shaped splicing frame (408), and one end of the storage sleeve (415) penetrates the inner wall of the waterproof insulation layer (409) and the inner wall of the arc-shaped splicing frame (408).

5. The double-sheathed ultra-high voltage cable according to claim 1, characterized in that: The two inner bushings (3) are provided with a positioning and reinforcing sealing mechanism (5) on the outside, and the positioning and reinforcing sealing mechanism (5) includes an inner sleeve (501). Both inner sleeves (3) are fitted with inner sleeves (501) on their outer sides, and both inner sleeves (501) are fitted with outer sleeves (502) on their outer sides. Support rings (503) are equidistantly engaged between the inner sleeves (501) and the outer sleeves (502). A flame-retardant layer (504) is filled between two adjacent support rings (503) on the inner wall of the outer sleeve (502). The support ring (503) is internally fitted with a reinforcing rib tube (505), and the annular sealing plate (402) is internally connected with a positioning screw rod (506) on one side corresponding to the reinforcing rib tube (505) by a thread. Both outer sleeves (502) are fitted with outer bushings (507), and each of the two outer bushings (507) is fixedly fitted with a positioning mounting ring (508) at an adjacent end on the outside. Each of the two positioning mounting rings (508) is symmetrically snapped with a splicing pad (509). Positioning clamps (510) are fitted at the top and bottom of the outer sides of the two positioning mounting rings (508), and positioning pins (511) are symmetrically connected between the two opposing positioning clamps (510) by threads. A waterproof sleeve (512) is snapped between each of the two positioning clamps (510) located on the same horizontal plane, and a waterproof adhesive (513) is installed between the two waterproof sleeves (512).

6. The double-sheathed ultra-high voltage cable according to claim 5, characterized in that: One end of the positioning screw (506) is embedded inside the reinforcing tube (505), and the outer side of the positioning screw (506) is connected to the inner wall of the reinforcing tube (505) by a thread. One end of the reinforcing tube (505) penetrates one end of the flame retardant layer (504).

7. A double-sheathed ultra-high voltage cable according to claim 5, characterized in that: The positioning mounting ring (508) has an embedded groove on its outer side, and the positioning clamp (510) has a locking block on its inner wall corresponding to the position inside the embedded groove. The splicing pad (509) has a through hole inside, and the bottom end of the positioning pin (511) passes through the bottom end of the through hole.

8. A method for manufacturing a double-sheathed ultra-high voltage cable according to claim 7, characterized in that: Includes the following steps: S1. Prepare conductors and install insulation: Prepare two conductors (1) and attach insulation (2) to their outer side, and then attach inner bushing (3). S2. Install the docking clamping mechanism: Set up a splicing collar (401) and an annular sealing plate (402), clamp and fix it by anti-drop ring (414) and inner sleeve (501), and further reinforce it with positioning screw (506) to ensure stable connection; S3. Install traction and limiting devices: Connect the traction collar (405) and the limiting ring cover (406) inside the annular sealing plate (402) to ensure smooth meshing between the drive gear ring (407) and the driven gear (404); S4. Fix the anti-deviation outer pad and splicing frame: Connect the splicing socket (411) and the connecting rod (403) by thread, and fix the anti-deviation outer pad (410) and the arc splicing frame (408) with the ring Velcro (419). S5. Fill the waterproof and heat-insulating layer and install the support device: Fill the arc splicing frame (408) with a waterproof and heat-insulating layer (409) and install the support clamping spring (416) and push rod (417).

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