A device and method for hot-melt repair of a cable structure sheath defect

Abstract

The application discloses a cable structure sheath defect hot melting repair device and method, and relates to the technical field of bridge engineering cable structure maintenance. The device comprises a ring-shaped main frame surrounding a to-be-repaired cable body, which is provided with an axial walking mechanism and a ring-shaped guide rail; a ring rotating device is engaged with the ring-shaped guide rail and connected with a working ring frame; the working ring frame is oppositely provided with first and second radial feeding mechanisms, and the output ends of the first and second radial feeding mechanisms are respectively connected with a hot melting pressure head and an opposite supporting piece. The method comprises the following steps: the split device is sleeved on the to-be-repaired cable body; the defect area is accurately positioned through axial walking and ring rotating; two radial feeding mechanisms are synchronously driven to realize coaxial opposite clamping; the defect area is subjected to controllable temperature hot melting repair; and the device is reset after cooling to complete the work. The device can complete the automatic repair of the cable body defect without the need of a climbing vehicle, can avoid the risk of high-altitude work and does not need to block traffic; the hot melting combination guarantees the repair quality; coaxial opposite clamping avoids the deformation of the cable body; and local repair does not interfere with the later detection.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering cable structure maintenance technology, specifically to a device and method for hot-melt repair of defects in cable structure sheaths. Background Technology

[0002] The cable-stayed structure is the core load-bearing component of long-span bridges such as cable-stayed bridges and suspension bridges, and its service life directly determines the overall safety and service life of the bridge. The polyethylene (PE) sheath, as an important part of the cable structure protection system, covers the entire surface of the cable structure except for the anchorage areas at both ends. It plays a crucial role in isolating moisture, preventing corrosion, and resisting ultraviolet aging, serving as the first line of defense to protect the internal steel strands or wires from external environmental erosion.

[0003] However, PE sheaths are prone to various defects throughout their lifecycle: during transportation, hoisting, and on-site installation after manufacturing, they are easily damaged by impacts and scratches, resulting in mechanical damage such as scratches and dents; these initial defects, under the long-term tensile stress on the cable body, will cause stress concentration, leading to rapid axial expansion of the defects; simultaneously, during long-term outdoor service, ultraviolet radiation, temperature fluctuations, and acid rain corrosion will cause localized aging, embrittlement, and cracking of the PE material. All of these defects will lead to a sharp decline in the protective performance of the sheath, exposing the internal steel cables to a corrosive environment, ultimately significantly shortening the service life of the cable structure and even causing bridge safety accidents. Therefore, timely repair and reinforcement of PE sheath defects is a necessary measure to ensure the long-term safe operation of bridge cable structures.

[0004] Currently, the repair of defects in the PE sheath of bridge cable structures mainly employs wrapping and manual hot-melt construction methods. Wrapping involves covering the defective area with multiple layers of anti-corrosion tape. This method only provides surface protection and does not substantially repair the defects in the PE sheath itself. The repair material cannot form a molecular-level bond with the original sheath, resulting in poor overall integrity and a tendency for delamination and water ingress over long-term use. Furthermore, large-area wrapping covers the cable surface, severely interfering with subsequent visual and non-destructive testing of the cable structure. While manual hot-melt construction achieves a thermal fusion bond between the repair material and the original PE sheath, resulting in better repair quality than wrapping, it suffers from insurmountable limitations: most bridge cable structures are long and installed at high altitudes, with the clearance under the bridge generally exceeding the working height of aerial work platforms, making construction impossible. Even in the few scenarios where there is sufficient space on the bridge deck and a lower working height, manual hot-melt construction requires closing the bridge to traffic, posing significant safety risks associated with working at heights, resulting in extremely low efficiency and high costs. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for hot-melt repair of defects in cable structure sheaths, so as to solve the problems existing in the prior art, effectively realize the repair of cable sheaths, avoid the safety risks of working at heights, ensure the repair quality and structural integrity, and effectively avoid cable bending deformation, thereby improving the safety, reliability and repair quality of the repair operation.

[0006] To achieve the above objectives, the present invention provides the following solution: a hot-melt repair device for defects in cable structure sheaths, comprising an annular main frame, the annular main frame being surrounded on the outside of the cable to be repaired; An axial traveling mechanism is provided on the annular main frame. The axial traveling mechanism includes a traveling wheel, and the wheel surface of the traveling wheel is used to contact the outer surface of the cable to be repaired. The inner circumferential surface of the annular main frame is provided with a continuous annular guide rail; the circumferential rotating device cooperates with the annular guide rail, and the circumferential rotating device is connected to a working ring frame; the working ring frame surrounds the outer side of the cable to be repaired. The working ring frame is equipped with a first radial feed mechanism and a second radial feed mechanism. The output end of the first radial feed mechanism is connected to a hot melt pressure head. The output end of the second radial feed mechanism is connected to a counter-support member. The counter-support member is arranged opposite to the hot melt pressure head.

[0007] As one embodiment, the annular main frame includes an upper ring frame and a lower ring frame; the upper ring frame includes an upper ring frame body one and an upper ring frame body two, and the mating ends of the upper ring frame body one and the upper ring frame body two are detachably and fixedly connected by a first mating bolt; the lower ring frame includes a lower ring frame body one and a lower ring frame body two, and the mating ends of the lower ring frame body one and the lower ring frame body two are detachably and fixedly connected by a third mating bolt.

[0008] As one embodiment, the working ring frame includes a working ring body one and a working ring body two, and the docking ends of the working ring body one and the working ring body two are detachably and fixedly connected by a second docking bolt.

[0009] In one embodiment, the first radial feed mechanism includes a first support guide member fixed on the working ring frame, a first sliding drive unit that slides with the first support guide member, and a first screw transmission pair. The nut of the first screw transmission pair is fixedly connected to the first support guide member, and one end of the screw of the first screw transmission pair is coaxially connected to the first sliding drive unit, and the other end is hinged to the hot melt pressure head.

[0010] In one embodiment, the hot melt press head includes a heat transfer rear plate, a heat transfer side plate, a heat transfer front plate, a metal resistance thermometer, and a temperature sensor; the heat transfer rear plate is hinged to the screw of the first screw drive pair; both ends of the heat transfer side plate are fixedly connected to the heat transfer front plate and the heat transfer rear plate; the metal resistance thermometer and the temperature sensor are both connected to the heat transfer front plate.

[0011] In one embodiment, the second radial feed mechanism includes a second support guide member fixed on the working ring frame, a second sliding drive unit that slides with the second support guide member, and a second screw drive pair. The nut of the second screw drive pair is fixedly connected to the second support guide member, and one end of the screw of the second screw drive pair is coaxially connected to the second sliding drive unit, while the other end is hinged to the opposing support member.

[0012] In one embodiment, the opposing support is an arc-shaped plate; the rear end face of the arc-shaped plate is hinged to the screw member of the second screw transmission pair; the front end face of the arc-shaped plate is an arc-shaped surface, and the curvature of the arc-shaped surface matches the curvature of the outer surface of the cable to be repaired.

[0013] As one embodiment, the axial traveling mechanism is provided on both the upper ring frame and the lower ring frame; the axial traveling mechanism also includes a telescopic frame, one end of which is fixedly connected to the upper ring frame or the lower ring frame, and the other end of which is connected to the traveling wheel.

[0014] As one embodiment, it also includes an image monitoring device; the image monitoring device is provided on both the upper ring frame and the lower ring frame; each of the image monitoring devices is fixedly connected to the inner periphery of the upper ring frame or the lower ring frame; the field of view of each of the image monitoring devices covers the outer surface of the cable to be repaired.

[0015] A method for hot-melt repair of defects in cable structure sheaths, using the aforementioned hot-melt repair device for cable structure sheath defects, includes the following steps: S1. Fitting and positioning: Fit the annular main frame onto the outside of the cable to be repaired, so that the annular main frame surrounds the cable to be repaired; S2, Traveling pretension: Adjust the axial travel mechanism so that the wheel surface of the travel wheel abuts against the outer surface of the cable to be repaired; S3, Axial positioning: Control the axial walking mechanism to drive the annular main frame to move along the axial direction of the cable to be repaired until the hot melt pressure head and the opposing support on the working ring frame are axially aligned with the defect area of ​​the cable to be repaired. S4. Circumferential Alignment: Control the circumferential rotation device to drive the working ring frame to rotate circumferentially along the annular guide rail until the hot melt pressure head and the opposing support are circumferentially aligned with the defect area of ​​the cable to be repaired; S5. Opposing clamping: Control the first radial feed mechanism to drive the hot melt pressure head to feed radially along the cable body to be repaired, and at the same time control the second radial feed mechanism to drive the opposing support to feed radially along the cable body to be repaired, until the hot melt pressure head and the opposing support press the defect area of ​​the cable body to be repaired from opposite sides respectively. S6. Hot melt repair: Start the hot melt pressure head to perform hot melt repair on the defective area of ​​the sheath; S7. Reset and retract the tool: After the hot melt repair is completed, control the first radial feed mechanism and the second radial feed mechanism to drive the hot melt pressure head and the opposing support to retract to the initial position respectively.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention employs a ring-shaped main frame as the overall load-bearing foundation. An axial walking mechanism enables the device to move autonomously along the axis of the cable to be repaired. Combined with a ring guide rail and a circumferential rotating device, the working ring frame completes circumferential rotation. This allows for automated repair of defects at any location on the cable without the need for a climbing vehicle, mitigating the safety risks of working at heights. Simultaneously, a hot-melt pressure head achieves molecular-level hot-melt bonding between the repair material and the original PE sheath, ensuring repair quality and structural integrity. Furthermore, a coaxial, opposing clamping structure is formed by opposing support members arranged opposite to the hot-melt pressure head. During hot-melt repair, forces are applied simultaneously from both sides of the cable, effectively offsetting the additional bending moment generated by unidirectional clamping force. This fundamentally avoids localized bending deformation and damage to the cable, significantly improving the stability and reliability of the repair operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the ring-shaped main frame structure; Figure 3 This is a schematic diagram of the assembly structure of the annular main frame and the lock body to be repaired according to the present invention; Figure 4 for Figure 3 A schematic diagram of the structure at the first and second radial feed mechanisms; Figure 5 This is a schematic diagram of the overall structure of the invention, omitting the cable to be repaired. Figure 6 This is a schematic diagram of the circumferential rotating device of the present invention.

[0019] Among them, 1. Circular main frame; 101. Circular guide rail; 102. Upper ring frame; 103. Lower ring frame; 104. Vertical track; 2. Axial travel mechanism; 201. Traveling wheels; 202. Telescopic frame 3. Working ring frame; 4. First radial feed mechanism; 401. First cross bracket; 402. First annular sleeve; 403. First forward screw; 404. First forward track; 405. First pulley; 406. First displacement motor; 407. First battery compartment; 5. Second radial feed mechanism; 501. Second cross bracket; 502. Second annular sleeve; 503. Second forward screw; 504. Second forward track; 505. Second pulley; 506. Second displacement motor; 507. Second battery compartment; 6. The cable body to be repaired; 7. Circumferential rotating device; 701. Transmission vertical shaft; 702. Upper gear; 8. Hot melt pressure head; 801. Heat transfer rear plate; 802. Heat transfer side plate; 803. Heat transfer front plate; 9. Opposing support; 10. Image monitoring device; 11. Protective plate; 12. Hot melt material roll. Detailed Implementation

[0020] 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.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a device for hot-melt repair of defects in cable structure sheaths. Please refer to [reference needed]. Figure 1 - Figure 6As shown, it includes a ring-shaped main frame 1, an axial travel mechanism 2, a working ring frame 3, a first radial feed mechanism 4, a second radial feed mechanism 5, and a circumferential rotation device 7. The ring-shaped main frame 1 is a split-type openable ring structure, which is detachably connected by two symmetrical semi-ring components through butt bolts. In use, the ring-shaped main frame 1 surrounds the outside of the cable body 6 to be repaired, realizing the quick installation and removal of the device on the existing cable body.

[0023] The axial traveling mechanism 2 is connected to the inner circumference of the annular main frame 1 and is used to drive the entire device to move along the axial direction of the cable body 6 to be repaired. The axial traveling mechanism 2 includes a traveling wheel 201 and a telescopic frame 202; one end of the telescopic frame 202 is fixedly connected to the inner circumference of the annular main frame 1, and the other end is rotatably connected to the wheel axle of the traveling wheel 201; the wheel surface of the traveling wheel 201 abuts against the outer surface of the cable body 6 to be repaired, and the clamping force between the traveling wheel 201 and the surface of the cable body can be changed by adjusting the telescopic frame 202 to adapt to cable structures of different diameters.

[0024] The inner circumferential surface of the annular main frame 1 is provided with a continuous annular guide rail 101. The circumferential rotating device 7 cooperates with the annular guide rail 101 and can move continuously along the circumference of the annular guide rail 101. The lower end of the circumferential rotating device 7 is fixedly connected to the working ring frame 3, thereby driving the working ring frame 3 to rotate 360° around the axis of the cable body 6 to be repaired. The working ring frame 3 is also a split-type openable annular structure, which is composed of two symmetrical semi-annular components that are detachably connected by butt bolts. When in use, it is wrapped around the outside of the cable body 6 to be repaired.

[0025] The first radial feed mechanism 4 and the second radial feed mechanism 5 are both mounted on the working ring frame 3 and are arranged opposite each other radially along the cable body 6 to be repaired. The output end of the first radial feed mechanism 4 is connected to a hot melt pressure head 8, which is used to drive the hot melt pressure head 8 to move closer to or away from the area to be repaired along the radial direction of the cable body. The output end of the second radial feed mechanism 5 is connected to a counter-support member 9, which is used to drive the counter-support member 9 to move closer to or away from the back side of the area to be repaired along the radial direction of the cable body 6 to be repaired.

[0026] The opposing support 9 and the hot melt pressure head 8 are arranged directly opposite each other along the radial direction of the cable body 6 to be repaired, and the centroids of the opposing support 9 and the hot melt pressure head 8 are located on the same radial straight line passing through the axis of the cable body 6 to be repaired. During the hot melt operation, the hot melt pressure head 8 presses the repair material onto the defect surface of the cable body, while the opposing support 9 presses the back of the cable body at the same time. The forces of the two cancel each other out, preventing the cable body from bending and deforming due to unidirectional pressure.

[0027] Work methods: Step 1: On-site installation preparation 1.1 Disassemble the connecting bolts of the annular main frame 1 and the working ring frame 3, and wrap the two semi-annular components around the cable body 6 from both sides of the cable body to be repaired. Tighten the connecting bolts again so that the annular main frame 1 and the working ring frame 3 are firmly fitted on the outside of the cable body 6 to be repaired.

[0028] 1.2 Adjust the telescopic frame 202 of the axial travel mechanism 2 so that the wheel surfaces of all the travel wheels 201 are in close contact with the outer surface of the cable body 6 to be repaired, so that the whole device will not slide down the cable body.

[0029] 1.3 Install the hot melt repair material strip onto the ready material reel on the working ring frame 3, and wrap the end of the material strip around the front end face of the hot melt pressure head 8 and fix it to the recycling material reel.

[0030] Step 2: Precisely locate the defect area 2.1 Start the axial travel mechanism 2, and drive the entire device to move along the axial direction of the cable body 6 to be repaired until the device reaches the axial position where the defect is located.

[0031] 2.2 Start the circumferential rotation device 7, so that it moves in a circle along the annular guide rail 101, driving the working ring frame 3 to rotate circumferentially around the axis of the cable body 6 to be repaired, until the front end face of the hot melt pressure head 8 is facing the defect area.

[0032] Step 3: Pre-tightening before repair 3.1 The first radial feed mechanism 4 and the second radial feed mechanism 5 are started simultaneously, driving the hot melt pressure head 8 and the opposing support 9 to move in opposite directions along the radial direction of the cable body, respectively.

[0033] 3.2 When the hot melt pressure head 8 presses the repair material strip onto the defect surface of the cable body, and the opposing support 9 simultaneously presses the corresponding position on the back of the cable body, the feed is stopped; at this time, the centroids of the hot melt pressure head 8 and the opposing support 9 are still on the same radial straight line passing through the cable body axis, and the two pressing forces are equal in magnitude and opposite in direction.

[0034] Step 4: Controlled Temperature Heat Melting Repair 4.1 Activate the electric heating element inside the hot melt press head 8 to heat the PE sheath of the repair material strip and the defect area of ​​the cable body, so that the contact surface between the two reaches the melting temperature.

[0035] 4.2 The heating temperature is collected in real time by the temperature sensor inside the hot melt head 8, and the temperature data is transmitted back to the remote control terminal. The heating power is adjusted according to the characteristics of the repair material, and the heating temperature and heating time are controlled within the preset range.

[0036] 4.3 During the heating process, the first radial feeding mechanism 4 maintains a constant feeding pressure to ensure that the molten repair material is fully bonded to the surface of the original sheath without bubbles or gaps.

[0037] Step 5: Cooling, curing, and repositioning 5.1 After the preset heating time is reached, turn off the electric heating element, keep the hot melt pressure head 8 and the opposing support 9 pressed in place, and allow the repair material to cool and solidify naturally.

[0038] 5.2 After cooling is complete, the first radial feed mechanism 4 and the second radial feed mechanism 5 are started in reverse so that the hot melt pressure head 8 and the opposing support 9 move away from the surface of the cable at the same time and return to the initial position.

[0039] 5.3 The new hot melt repair material strip is conveyed to the front end of the hot melt pressure head 8 in preparation for the next repair operation.

[0040] Step 6: Continuous Operation and Equipment Disassembly 6.1 Repeat steps 2 to 5 to repair other defective areas on the cable body until all defects are repaired.

[0041] 6.2 Start the axial walking mechanism 2, drive the entire device down to the ground along the cable body, disassemble the connecting bolts of the working ring frame 3 and the ring main frame 1 in sequence, remove the device from the cable body, and complete all operations.

[0042] In one embodiment, the annular main frame 1 includes an upper ring frame 102 and a lower ring frame 103 arranged coaxially. The upper ring frame 102 is a split-type opening and closing structure, including an upper ring frame one and an upper ring frame two symmetrically arranged; the two mating ends of the upper ring frame one and the upper ring frame two are provided with coaxial bolt holes, which detachably and fix the upper ring frame one and the upper ring frame two to form a complete annular structure that surrounds the outside of the cable body 6 to be repaired. The lower ring frame 103 is a split-type opening and closing structure coaxial with the upper ring frame 102, including a lower ring frame one and a lower ring frame two symmetrically arranged; the mating ends of the lower ring frame one and the lower ring frame two are provided with coaxial bolt holes, and a third mating bolt passes through the bolt holes to detachably and fix the lower ring frame one and the lower ring frame two to form a complete annular structure that surrounds the outside of the cable body 6 to be repaired.

[0043] The upper ring frame 102 and the lower ring frame 103 are fixedly connected by a vertical rail 104, so that the upper ring frame 102 and the lower ring frame 103 form a rigid whole; a continuous annular guide rail 101 is provided on the inner circumferential surface of the upper ring frame 102.

[0044] In one embodiment, the working ring frame 3 is a split-type openable ring structure, including a symmetrically arranged working ring body one and a working ring body two. Coaxial bolt holes are provided on both docking ends of the working ring body one and the working ring body two. A second docking bolt passes through the bolt holes to detachably and fix the working ring body one and the working ring body two, forming a complete ring structure that surrounds the outside of the cable body 6 to be repaired.

[0045] The upper end face of the working ring frame 3 is provided with a mounting position for the circumferential rotating device 7, and the lower end of the circumferential rotating device 7 is fixedly connected to the upper end face of the working ring frame 3; the working ring frame 3 is provided with mounting positions for the first radial feeding mechanism 4 and the second radial feeding mechanism 5, and the first radial feeding mechanism 4 and the second radial feeding mechanism 5 are respectively fixedly connected to the inner circumference of the working ring frame 3.

[0046] In one embodiment, the circumferential rotation device 7 specifically includes four sets of circumferential drive units, which are evenly distributed along the circumference of the working ring frame 3. Each set of circumferential drive units includes a circumferential drive motor, a transmission vertical shaft 701, and an upper gear 702; the circumferential drive motor is fixedly connected to the upper end face of the working ring frame 3, the output shaft of the circumferential drive motor is coaxially fixedly connected to the lower end of the transmission vertical shaft 701, and the upper end of the transmission vertical shaft 701 is coaxially fixedly connected to the upper gear 702.

[0047] The inner circumferential surface of the annular guide rail 101 is provided with continuous transmission teeth, and the upper gear 702 meshes with the transmission teeth of the annular guide rail 101. During operation, the circumferential drive motor outputs rotational power, driving the transmission vertical shaft 701 and the upper gear 702 to rotate synchronously. Since the annular guide rail 101 is fixed to the upper ring frame 102 and remains stationary, the upper gear 702 rolls along the circumference of the annular guide rail 101 under the action of meshing transmission, thereby driving the working ring frame 3 to rotate circumferentially around the axis of the cable body 6 to be repaired, so that the hot melt pressure head 8 can be accurately aligned with the defect area of ​​the cable body 6 to be repaired.

[0048] In one embodiment, the first radial feed mechanism 4 includes a first support guide member, a first sliding drive unit, and a first screw drive pair fixed on the working ring frame 3; the first sliding drive unit is slidably engaged with the first support guide member, the nut of the first screw drive pair is fixedly connected to the first support guide member, one end of the screw of the first screw drive pair is coaxially connected to the first sliding drive unit, and the other end of the first screw drive pair is hinged to the hot melt press head 8. During operation, the first sliding drive unit outputs rotational power, driving the screw of the first screw transmission pair, which is coaxially fixed to it, to rotate synchronously. Since the nut of the first screw transmission pair is fixed to the first support guide member and remains stationary, the screw generates linear displacement along its own axis under the threaded engagement with the nut. At the same time, the first sliding drive unit slides synchronously along the first support guide member with the screw to ensure the straightness of the movement. Finally, the screw drives the hot melt pressure head 8, which is hinged to it, to move radially along the cable body 6 to be repaired. When the first sliding drive unit rotates in the forward direction, it drives the hot melt pressure head 8 to approach and press against the surface of the cable body. When it rotates in the reverse direction, it drives the hot melt pressure head 8 away from the surface of the cable body and back to the initial position.

[0049] In this embodiment, the first support and guide member includes a first cross bracket 401 and a first forward track 404, the first sliding drive unit includes a first sliding wheel 405, a first displacement motor 406 and a first battery compartment 407, and the first screw transmission pair specifically includes a first annular sleeve 402 and a first forward screw 403.

[0050] One end of the first cross bracket 401 is fixedly connected to the top surface of the working ring frame 3, and the other end of the first cross bracket 401 is fixedly connected to the first annular sleeve 402. The first forward track 404 is fixedly connected to the working ring frame 3, and its extension direction is consistent with the radial direction of the cable body 6 to be repaired. The first sliding wheel 405 is rotatably connected to the first battery compartment 407 through a bearing. The first sliding wheel 405 is in rolling engagement with the first forward track 404, and the first sliding wheel 405 can only reciprocate along the extension direction of the first forward track 404. The first displacement motor 406 is connected to the first battery compartment 407, and the first battery compartment 407 is used to provide power to the first displacement motor 406.

[0051] One end of the first forward screw 403 is coaxially and fixedly connected to the output shaft of the first displacement motor 406. The first forward screw 403 passes through the first annular sleeve 402 and is threadedly engaged with the first annular sleeve 402. The other end of the first forward screw 403 is hinged to the rear end face of the hot melt pressure head 8. When the first forward screw 403 rotates, there is no relative rotation between the hot melt pressure head 8 and the cable body 6 to be repaired.

[0052] During operation, the first displacement motor 406 outputs rotational power, driving the first forward screw 403 to rotate synchronously. Since the first annular sleeve 402 is fixed to the working ring frame 3 by the first cross bracket 401 and remains stationary, the first forward screw 403 generates linear displacement along its own axis under the action of the threaded engagement. At the same time, the first displacement motor 406 and the first battery compartment 407 move synchronously with the first forward screw 403, driving the first sliding wheel 405 to roll along the first forward track 404 to ensure the straightness of the movement. Finally, the first forward screw 403 drives the hot melt pressure head 8 to move radially along the cable body 6 to be repaired. When the first displacement motor 406 rotates in the forward direction, it drives the hot melt pressure head 8 to approach and press against the surface of the cable body 6 to be repaired. When it rotates in the reverse direction, it drives the hot melt pressure head 8 away from the surface of the cable body 6 to return to the initial position.

[0053] In one embodiment, the hot melt press head 8 includes a heat transfer rear plate 801, heat transfer side plates 802, a heat transfer front plate 803, a metal resistance thermometer, and a temperature sensor. The rear end face of the heat transfer rear plate 801 is hinged to the screw of the first screw drive pair, specifically, the rear end face of the heat transfer rear plate 801 is hinged to the front end of the first forward screw 403. There are two heat transfer side plates 802. The front ends of the two heat transfer side plates 802 are respectively fixedly connected to the left and right sides of the heat transfer front plate 803 by bolts, and the rear ends of the two heat transfer side plates 802 are respectively fixedly connected to the left and right sides of the heat transfer rear plate 801 by bolts, so that the heat transfer rear plate 801, heat transfer side plates 802, and heat transfer front plate 803 together enclose an internal cavity. The metal resistance thermometer can be disposed in this internal cavity. A metal resistance thermometer is connected to the inner surface of the heat transfer front plate 803, and a temperature sensor is also connected to the inner surface of the heat transfer front plate 803. The outer surface of the heat transfer front plate 803 is an arc-shaped surface, and the curvature of the arc-shaped surface matches the curvature of the outer surface of the cable body 6 to be repaired.

[0054] During operation, the metal resistance thermometer is energized and generates heat, which is then transferred to the heat transfer front plate 803. The temperature sensor collects the temperature data of the heat transfer front plate 803 in real time. The heat transfer front plate 803 then transfers the heat to the heat-melting repair material in contact with its outer surface, thereby achieving heat-melting repair of the defective area of ​​the cable.

[0055] In one embodiment, the second radial feed mechanism 5 includes a second support guide member, a second sliding drive unit, and a second screw drive pair fixed on the working ring frame 3. The second sliding drive unit is slidably engaged with the second support guide member. The nut of the second screw drive pair is fixedly connected to the second support guide member. One end of the screw of the second screw drive pair is coaxially connected to the second sliding drive unit, and the other end of the second screw drive pair is hinged to the opposing support member 9. When the second radial feed mechanism 5 is working, the second sliding drive unit outputs rotational power, which drives the screw of the second screw transmission pair coaxially connected with it to rotate synchronously. Since the nut of the second screw transmission pair is fixed to the second support guide member and remains stationary, the screw generates linear displacement along its own axis under the threaded engagement with the nut. At the same time, the second sliding drive unit slides synchronously with the screw along the second support guide member to ensure the straightness of the movement. Finally, the screw drives the opposing support member 9, which is hinged to it, to move radially along the cable body 6 to be repaired. When the second sliding drive unit rotates in the forward direction, it drives the opposing support member 9 to approach and press against the back of the cable body 6 to be repaired. When it rotates in the reverse direction, it drives the opposing support member 9 away from the surface of the cable body 6 to be repaired and back to the initial position.

[0056] In this embodiment, the second support guide member includes a second cross bracket 501 and a second forward track 504, the second sliding drive unit includes a second sliding wheel 505, a second displacement motor 506 and a second battery compartment 507, and the second screw drive pair specifically includes a second annular sleeve 502 and a second forward screw 503.

[0057] One end of the second cross bracket 501 is fixedly connected to the working ring frame 3, and the other end of the second cross bracket 501 is fixedly connected to the second annular sleeve 502. The second forward track 504 is fixedly connected to the inner circumference of the working ring frame 3, and its extension direction is consistent with the radial direction of the cable body 6 to be repaired. The second sliding wheel 505 is rotatably connected to the side wall of the second battery compartment 507 through a bearing. The second sliding wheel 505 and the second forward track 504 are in rolling engagement, and can only reciprocate along the extension direction of the second forward track 504. The second displacement motor 506 is connected to the second battery compartment 507, and the second battery compartment 507 is used to provide power to the second displacement motor 506.

[0058] One end of the second forward screw 503 is coaxially and fixedly connected to the output shaft of the second displacement motor 506. The second forward screw 503 passes through the second annular sleeve 502 and is threadedly engaged with the second annular sleeve 502. The other end of the second forward screw 503 is hinged to the rear end face of the opposing support member 9. When the second forward screw 503 rotates, there is no relative rotation between the opposing support member 9 and the cable body 6 to be repaired.

[0059] During operation, the second displacement motor 506 outputs rotational power, driving the second forward screw 503 to rotate synchronously. Since the second annular sleeve 502 is fixed to the working ring frame 3 by the second cross bracket 501 and remains stationary, the second forward screw 503 generates linear displacement along its own axis under the action of the threaded engagement. At the same time, the second displacement motor 506 and the second battery compartment 507 move synchronously with the second forward screw 503, driving the second sliding wheel 505 to roll along the second forward track 504 to ensure the straightness of the movement. Finally, the second forward screw 503 drives the opposing support member 9 to move radially along the cable body 6 to be repaired. When the second displacement motor 506 rotates in the forward direction, it drives the opposing support member 9 to approach and press against the back of the cable body 6 to be repaired. When it rotates in the reverse direction, it drives the opposing support member 9 away from the surface of the cable body 6 to return to the initial position.

[0060] In one embodiment, the opposing support 9 is specifically an arc-shaped plate. The rear end face of the arc-shaped plate is hinged to the screw member of the second screw drive pair, specifically to the front end of the second forward screw 503; the front end face of the arc-shaped plate is an arc-shaped surface, and the curvature of the arc-shaped surface matches the curvature of the outer surface of the cable body 6 to be repaired. The output force lines of the first radial feed mechanism 4 and the second radial feed mechanism 5 coincide, and the centroid of the arc-shaped plate, the centroid of the hot melt pressure head 8, the axis of the first forward screw 403, and the axis of the second forward screw 503 are located on the same radial straight line passing through the axis of the cable body 6 to be repaired. This coaxial pressing structure ensures that the pressure applied by the hot melt pressure head 8 to the cable body 6 to be repaired is equal in magnitude, opposite in direction, and coincident in line of action with the reverse support force provided by the opposing support 9. The force passes through the center of the cross section of the cable body 6 to be repaired, and no additional bending moment is generated, thereby effectively preventing local bending deformation and local damage to the cable body 6 to be repaired during the hot melt repair operation.

[0061] In one embodiment, the axial traveling mechanism 2 includes a telescopic frame 202 and a traveling wheel 201; the axial traveling mechanism 2 is provided on both the upper ring frame 102 and the lower ring frame 103. The fixed end of the telescopic frame 202 is fixedly connected to the side wall of the upper ring frame 102 or the lower ring frame 103, and the telescopic end of the telescopic frame 202 is rotatably connected to the axle of the traveling wheel 201; the telescopic direction of the telescopic frame 202 is consistent with the radial direction of the cable body 6 to be repaired. The telescopic frame 202 can automatically extend and retract radially to ensure that the wheel surface of the traveling wheel 201 is always in close contact with the outer surface of the cable body 6 to be repaired and maintains a stable contact pressure, effectively preventing the device from slipping or deviating during axial travel.

[0062] In one embodiment, the system further includes at least one image monitoring device 10; both the upper ring frame 102 and the lower ring frame 103 are equipped with image monitoring devices 10; each image monitoring device 10 is fixedly connected to the inner circumference of the upper ring frame 102 or the lower ring frame 103. Preferably, a total of four image monitoring devices 10 are provided, with two image monitoring devices 10 on each of the upper ring frame 102 and the lower ring frame 103. The field of view of each image monitoring device 10 covers the outer surface of the cable body 6 to be repaired.

[0063] Preferably, the fields of view of each image monitoring device 10 overlap and jointly cover the outer circumferential surface of the cable body 6 to be repaired. This enables monitoring of the surface of the cable body 6 to be repaired, allowing for real-time acquisition of defect images of the cable body surface, monitoring of the entire hot melt repair process, and the ability of the image monitoring device 10 to capture and return repair images of the damaged area in real time, as well as to verify the repair effect.

[0064] In one embodiment, the hot-melt repair device for defects in the cable structure sheath further includes a protective plate 11 and a vertical track 104. The protective plate 11 consists of two symmetrical parts; the lower end of the protective plate 11 is provided with protective plate fixing holes at 90° intervals along the circumference, and the protective plate 11 can be laterally detachably fixed to the working ring frame 3 by bolts passing through the protective plate fixing holes; multiple circular holes are evenly distributed on the surface of the protective plate 11. The vertical track 104 is meshed with the track in the upper ring frame 102 and the track in the lower ring frame 103 through upper gears and lower gears, respectively; the vertical track 104 provides a track for the vertical translation of the protective plate 11; the vertical track 104 connects the upper ring frame 102 and the lower ring frame 103.

[0065] During operation, the protective plate 11 is laterally fixed to the working ring frame 3 via bolts, providing protection for the equipment above the working ring frame 3. During non-operational operation, the bolts connecting the protective plate 11 to the working ring frame 3 can be removed, allowing the protective plate 11 to descend along the vertical track 104, facilitating maintenance of the equipment in the working ring frame 3 area. The circular holes on the protective plate 11 reduce its weight and allow observation of the internal condition of the equipment before it is lifted.

[0066] The vertical track 104 enhances the stability of the device during movement and operation. On the one hand, the vertical track 104 provides a stable guide track for the vertical translation of the protective plate 11, and on the other hand, it rigidly connects the upper ring frame 102 and the lower ring frame 103 into a whole, which significantly enhances the overall structural strength and rigidity of the annular main frame 1 and effectively prevents the device from deforming and shaking during axial movement and circumferential rotation.

[0067] In one embodiment, the cable structure sheath defect hot-melt repair device further includes a data transmission and receiving device; the data transmission and receiving device is fixedly connected to the outer periphery of the annular main frame 1. The data transmission and receiving device is electrically connected to the axial travel mechanism 2, the circumferential rotation device 7, the first radial feed mechanism 4, the second radial feed mechanism 5, the temperature sensor inside the hot-melt pressure head 8, and the image monitoring device 10.

[0068] The data transmission and receiving device is used to receive axial movement commands, circumferential movement commands, and hot melt repair commands issued by the remote control terminal, and to control the working status of the axial travel mechanism 2, the circumferential rotation device 7, the first radial feed mechanism 4, the second radial feed mechanism 5, and the hot melt pressure head 8 according to the commands; at the same time, the data transmission and receiving device is used to transmit the image data collected by the image monitoring device 10 and the temperature data measured by the temperature sensor to the remote control terminal in real time.

[0069] In one embodiment, the device further includes a hot-melt material reel 12, which comprises two rotating shafts: a ready-to-use material reel and a recycled material reel. The ready-to-use material reel is fixedly mounted on the working ring frame and is used to wind and store the hot-melt repair material to be used. The recycled material reel is equipped with a recycled material reel motor, and both the recycled material reel and the recycled material reel motor are fixedly connected to the working ring frame. After the hot-melt repair work on the damaged area is completed, the recycled material reel motor drives the recycled material reel to rotate. On the one hand, it feeds out the hot-melt repair material on the ready-to-use material reel, aligning the hot-melt repair material with the next damaged area to be repaired. On the other hand, it simultaneously winds up the base strip of the used and peeled hot-melt repair material, thereby continuously supplying repair material and realizing multiple hot-melt repair operations on the cable to be repaired.

[0070] In this embodiment, both the ready-to-use material roll and the recycled material roll of the hot-melt material roll 12 are mounted on the working ring frame 3. Before use, the hot-melt repair material is compounded and extruded with the base strip into a roll, which is initially mounted on the ready-to-use material roll. Before the hot-melt repair operation starts, the base strip end at the front end of the material strip extends out and is fixedly connected to the recycled material roll, and the hot-melt repair material side of the material strip is wrapped around the outer surface of the heat transfer front plate 803 of the hot-melt pressure head 8 with the hot-melt repair material side facing outward. During the hot-melt repair operation, the first radial feed mechanism 4 drives the hot-melt pressure head 8 to press the material strip tightly against the defect surface of the cable body 6 to be repaired. After heating, the hot-melt repair material is fused and bonded to the surface of the cable structure sheath and detached from the base strip. After a single repair is completed, the hot-melt pressure head 8 retracts radially, and the motor of the material recovery roll starts. The base strip is rotated by the recovery roll, and then the tension of the strip drives the material roll to rotate synchronously to release the material. The unused hot-melt repair material section is extended and transported to the corresponding working position of the heat transfer front plate 803 to align with the next defect area to be repaired. At the same time, the peeled base strip is wound up in the material recovery roll. By repeating this cycle, continuous hot-melt repair of multiple defects in the cable body 6 can be achieved.

[0071] Example 2 This embodiment provides a working method for a cable structure sheath defect hot-melt repair device, based on the cable structure sheath defect hot-melt repair device in Embodiment 1. The specific steps are as follows: Step 1: On-site installation and system debugging 1.1 Disassemble the first and third connecting bolts of the annular main frame 1, and wrap the two half rings of the upper ring frame 102 and the two half rings of the lower ring frame 103 around the cable body 6 to be repaired from both sides, and tighten the connecting bolts again so that the annular main frame 1 is firmly fitted on the outside of the cable body 6 to be repaired; at the same time, disassemble the second connecting bolt of the working ring frame 3, and use the same method to fit the working ring frame 3 on the outside of the cable body 6 to be repaired and tighten the bolts.

[0072] 1.2 Adjust the telescopic frames 202 of all axial walking mechanisms 2 on the upper ring frame 102 and the lower ring frame 103 respectively, so that the wheel surface of each walking wheel 201 is in contact with the outer surface of the cable body 6 to be repaired, ensuring that the whole device will not slide down along the cable body, and at the same time adapt to cable structures of different diameters.

[0073] 1.3. Install the hot melt repair material strip onto the ready material reel on the working ring frame 3, and wrap the end of the material strip around the outer surface of the heat transfer front plate 803 of the hot melt pressure head 8 and fix it to the recycling material reel.

[0074] 1.4. Secure the protective plate 11 to the side of the working ring frame 3 using bolts that pass through the fixing holes at its lower end, thus completing the protective installation in the working state.

[0075] 1.5. Start the data transmission and receiving device, establish a communication connection with the remote control terminal, debug the remote control functions of the axial travel mechanism 2, the circumferential rotation device 7, the first radial feed mechanism 4, the second radial feed mechanism 5, the hot melt pressing head 8, and the image monitoring device 10, and confirm that all signal transmissions are normal.

[0076] Step 2: Precise Defect Region Localization Based on Image Feedback 2.1. The axial movement command is sent through the remote control terminal. After receiving the command, the data transmission and receiving device controls the axial walking mechanism 2 to start, and the entire drive device moves along the axial direction of the cable body 6 to be repaired. During the movement, the image monitoring device 10 on the upper ring frame 102 and the lower ring frame 103 collects images of the cable body surface in real time and transmits them back to the remote control terminal until the device reaches the axial position where the defect is located.

[0077] 2.2. Send a circumferential motion command through the remote control terminal to control the circumferential rotation device 7 to move in a circle along the annular guide rail 101, driving the working ring frame 3 to rotate circumferentially around the axis of the cable body 6 to be repaired; during the rotation, continuously adjust the position through the image feedback from the image monitoring device 10 until the heat transfer front plate 803 of the hot melt pressure head 8 is directly facing the defect area.

[0078] 2.3. Confirm that the defect area is completely within the coverage of the hot melt press head 8 by using the overlapping field of view of the image monitoring device 10, and complete the final positioning.

[0079] Step 3: Coaxial pre-compression 3.1. The feed command is sent synchronously through the remote control terminal to control the first radial feed mechanism 4 and the second radial feed mechanism 5 to start simultaneously: the first displacement motor 406 drives the first forward screw 403 to rotate, driving the hot melt pressure head 8 to move radially toward the cable body 6 to be repaired; the second displacement motor 506 drives the second forward screw 503 to rotate synchronously, driving the opposing support 9 to move radially toward the back of the cable body 6 to be repaired.

[0080] 3.2 When the hot melt pressure head 8 presses the repair material strip onto the defect surface of the cable body, and the opposing support 9 simultaneously presses the corresponding position on the back of the cable body, the feed is stopped; at this time, the centroid of the arc plate, the centroid of the hot melt pressure head 8, the axis of the first forward screw 403 and the axis of the second forward screw 503 are still on the same radial straight line passing through the axis of the cable body 6 to be repaired, and the two pressing forces are equal in magnitude and opposite in direction, with no additional bending moment generated.

[0081] Step 4: Remote Controlled Temperature Thermofusion Repair 4.1. Send a hot melt repair command through the remote control terminal to start the metal thermal resistor in the internal cavity of the hot melt pressure head 8 to generate heat. The heat is transferred to the PE sheath of the repair material strip and the defect area of ​​the cable through the heat transfer front plate 803.

[0082] 4.2 The temperature sensor inside the hot melt pressing head 8 collects the temperature data of the heat transfer front plate 803 in real time, and transmits it to the remote control terminal in real time through the data transmission and receiving device; the control terminal automatically adjusts the heating power according to the characteristics of the repair material, and controls the heating temperature and heating time within the preset range.

[0083] 4.3 During the heating process, the first radial feeding mechanism 4 maintains a constant feeding pressure to ensure that the molten repair material is fully bonded to the surface of the original sheath without bubbles or gaps; the image monitoring device 10 monitors the welding process throughout and transmits the repair images back in real time.

[0084] Step 5: Cooling, curing, and inspection of repair results 5.1 After the preset heating time is reached, the remote control terminal sends a stop heating command to shut down the metal resistance thermometer; the hot melt head 8 and the opposing support 9 remain in a pressed state, allowing the repair material to cool and solidify naturally.

[0085] 5.2 After cooling is completed, the first radial feed mechanism 4 and the second radial feed mechanism 5 are started in reverse synchronously, so that the hot melt pressure head 8 and the opposing support 9 move away from the surface of the cable body and return to the initial position.

[0086] 5.3 The control image monitoring device 10 acquires high-definition images of the repair area and transmits them back to the remote control terminal to automatically or manually inspect the repair effect and confirm that the repair quality is qualified.

[0087] Step 6: Continuous Operation and Equipment Disassembly 6.1 If there are multiple defects on the cable body, repeat steps 2 to 5 to repair all defective areas in turn until all defects are repaired.

[0088] 6.2 After all repair work is completed, the bolts connecting the protective plate 11 and the working ring frame 3 can be removed, so that the protective plate 11 can be lowered along the vertical track 104 to the lower ring frame 103, exposing the device in the area of ​​the working ring frame 3, which is convenient for inspection and maintenance.

[0089] 6.3 Start the axial travel mechanism 2, and drive the entire device down to the ground along the cable body 6 to be repaired; disassemble the connecting bolts of the working ring frame 3 and the ring main frame 1 in sequence, separate each semi-ring component from the cable body, and complete the disassembly and removal of the device.

[0090] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0091] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for hot-melt repair of defects in cable structure sheaths, characterized in that, Includes an annular main frame (1), which surrounds the outside of the cable body (6) to be repaired; An axial walking mechanism (2) is provided on the annular main frame (1). The axial walking mechanism (2) includes a walking wheel (201). The wheel surface of the walking wheel (201) is used to contact the outer surface of the cable body (6) to be repaired. The inner circumferential surface of the annular main frame (1) is provided with a continuous annular guide rail (101); the circumferential rotating device (7) cooperates with the annular guide rail (101), and the circumferential rotating device (7) is connected to a working ring frame (3); the working ring frame (3) surrounds the outside of the cable body (6) to be repaired; The working ring frame (3) is provided with a first radial feed mechanism (4) and a second radial feed mechanism (5). The output end of the first radial feed mechanism (4) is connected to a hot melt head (8). The output end of the second radial feed mechanism (5) is connected to a counter support (9). The counter support (9) is arranged opposite to the hot melt head (8).

2. The hot-melt repair device for defects in cable structure sheaths according to claim 1, characterized in that, The annular main frame (1) includes an upper ring frame (102) and a lower ring frame (103); the upper ring frame (102) includes an upper ring frame one and an upper ring frame two, and the mating ends of the upper ring frame one and the upper ring frame two are detachably and fixedly connected by a first mating bolt; the lower ring frame (103) includes a lower ring frame one and a lower ring frame two, and the mating ends of the lower ring frame one and the lower ring frame two are detachably and fixedly connected by a third mating bolt.

3. The hot-melt repair device for defects in cable structure sheaths according to claim 1, characterized in that, The working ring frame (3) includes a working ring body one and a working ring body two. The docking ends of the working ring body one and the working ring body two are detachably and fixedly connected by a second docking bolt.

4. The hot-melt repair device for defects in cable structure sheaths according to claim 1, characterized in that, The first radial feed mechanism (4) includes a first support guide member fixed on the working ring frame (3), a first sliding drive unit that slides with the first support guide member, and a first screw transmission pair. The nut of the first screw transmission pair is fixedly connected to the first support guide member. One end of the screw of the first screw transmission pair is coaxially connected to the first sliding drive unit, and the other end is hinged to the hot melt press head (8).

5. The hot-melt repair device for defects in cable structure sheaths according to claim 4, characterized in that, The hot melt press head (8) includes a heat transfer rear plate (801), a heat transfer side plate (802), a heat transfer front plate (803), a metal resistance thermometer, and a temperature sensor; the heat transfer rear plate (801) is hinged to the screw of the first screw drive pair; both ends of the heat transfer side plate (802) are fixedly connected to the heat transfer front plate (803) and the heat transfer rear plate (801); the metal resistance thermometer and the temperature sensor are both connected to the heat transfer front plate (803).

6. The hot-melt repair device for defects in cable structure sheaths according to claim 1, characterized in that, The second radial feed mechanism (5) includes a second support guide member fixed on the working ring frame (3), a second sliding drive unit that slides with the second support guide member, and a second screw transmission pair. The nut of the second screw transmission pair is fixedly connected to the second support guide member. One end of the screw of the second screw transmission pair is coaxially connected to the second sliding drive unit, and the other end is hinged to the opposing support member (9).

7. The hot-melt repair device for defects in cable structure sheaths according to claim 6, characterized in that, The opposing support (9) is an arc-shaped plate; the rear end face of the arc-shaped plate is hinged to the screw of the second screw transmission pair; the front end face of the arc-shaped plate is an arc-shaped surface, and the curvature of the arc-shaped surface matches the curvature of the outer surface of the cable body (6) to be repaired.

8. The hot-melt repair device for defects in cable structure sheaths according to claim 2, characterized in that, The axial walking mechanism (2) is provided on both the upper ring frame (102) and the lower ring frame (103); the axial walking mechanism (2) also includes a telescopic frame (202), one end of the telescopic frame (202) is fixedly connected to the upper ring frame (102) or the lower ring frame (103), and the other end of the telescopic frame (202) is connected to the walking wheel (201).

9. The hot-melt repair device for defects in cable structure sheaths according to claim 2, characterized in that, It also includes an image monitoring device (10); the image monitoring device (10) is provided on both the upper ring frame (102) and the lower ring frame (103); each of the image monitoring devices (10) is fixedly connected to the inner periphery of the upper ring frame (102) or the lower ring frame (103); the field of view of each of the image monitoring devices (10) covers the outer surface of the cable body (6) to be repaired.

10. A method for hot-melt repair of defects in a cable structure sheath, characterized in that, The hot-melt repair device for defects in cable structure sheaths according to any one of claims 1-9 includes the following steps: S1. Fitting and positioning: Fit the annular main frame (1) onto the outside of the cable body (6) to be repaired, so that the annular main frame (1) surrounds the cable body (6) to be repaired. S2, Walking pretension: Adjust the axial walking mechanism (2) so that the wheel surface of the walking wheel (201) abuts against the outer surface of the cable body (6) to be repaired; S3, Axial positioning: Control the axial walking mechanism (2) to drive the ring main frame (1) to move along the axial direction of the cable body (6) to be repaired until the hot melt pressure head (8) and the opposing support (9) on the working ring frame (3) are axially aligned with the defect area of ​​the cable body (6) to be repaired. S4, Circumferential Alignment: Control the circumferential rotation device (7) to drive the working ring frame (3) to rotate circumferentially along the annular guide rail (101) until the hot melt pressure head (8) and the opposing support (9) are circumferentially aligned with the defect area of ​​the cable body (6) to be repaired; S5, Opposite clamping: Control the first radial feed mechanism (4) to drive the hot melt pressure head (8) to feed radially along the cable body (6) to be repaired, and at the same time control the second radial feed mechanism (5) to drive the opposing support (9) to feed radially along the cable body (6) to be repaired, until the hot melt pressure head (8) and the opposing support (9) respectively press the defect area of ​​the cable body (6) to be repaired from opposite sides; S6. Hot melt repair: Start the hot melt pressure head (8) to perform hot melt repair on the defective area of ​​the sheath; S7. Reset and retract the tool: After the hot melt repair is completed, control the first radial feed mechanism (4) and the second radial feed mechanism (5) to drive the hot melt pressure head (8) and the opposing support (9) back to the initial position respectively.

Images