Method for repairing poor grounding lead coating of high-voltage cable accessory

Abstract

The invention discloses a method for repairing poor grounding lead coating of a high-voltage cable accessory, and relates to the technical field of high-voltage cables, and the method comprises the following steps: removing a lead coating structure and a coating layer at the grounding part of the high-voltage cable accessory; the outer sheath of the cable is stripped and cut according to actual conditions; cleaning impurities on the surface of the metal sheath of the cable; preparing two semicircular metal sleeves, sleeving the two semicircular metal sleeves on the outer side of a metal sheath of the cable, and keeping the two semicircular metal sleeves fixed through a pre-tightening structure; the top of the semicircular metal sleeve is fixedly connected with the tail pipe of the high-voltage cable accessory by adopting a welding process, and the bottom of the semicircular metal sleeve is fixedly connected with the metal sheath of the cable by adopting the welding process; preparing a grounding braided wire, and respectively welding and fixing one end of the grounding braided wire with the tail pipe of the high-voltage cable terminal and the metal sheath of the cable by adopting a welding process; and a field plastic packaging technology is adopted to complete sealing of the repair area.

Description

Technical Field

[0001] This invention relates to high-voltage cable technology, and more specifically to a method for repairing poor lead lining in high-voltage cable accessories. Background Technology

[0002] High-voltage cable accessories (also known as high-voltage power cable accessories) are divided into high-voltage joint accessories and high-voltage termination accessories. The connection between the copper outer shell of the high-voltage joint accessory and the cable's corrugated metal conduit, and the connection between the grounding sleeve of the high-voltage termination accessory and the cable's corrugated metal conduit, mostly employ lead-lined metal shielding. Please see [link to relevant documentation]. Figure 1 .

[0003] During manufacturing or operation, defects such as lead enamel peeling, cracking, and blistering often occur, severely affecting grounding continuity and accessory sealing performance, thus threatening the operational safety of the cable system. Existing technologies mostly rely on manual repair, which is complex, inconsistent, and fails to meet the need for rapid and reliable on-site repair. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a method for repairing poor lead lining of high-voltage cable accessories. This repair method has the advantages of being more efficient, more reliable, and more standardized.

[0005] The objective of this invention is achieved through the following technical solution: A method for repairing faulty lead lining of high-voltage cable accessories includes the following steps: (1) Remove the lead-lined structure and its covering layer at the grounding point of the high-voltage cable accessories; (2) Strip the outer sheath of the cable according to the actual situation; clean the impurities on the surface of the metal sheath of the cable; (3) Prepare two semi-circular metal sleeves and put them on the outside of the metal sheath of the cable. The two semi-circular metal sleeves are fixed together by a pre-tightening structure. (4) The top of the semi-circular metal sleeve is fixedly connected to the tail tube of the high-voltage cable accessory by welding process, and the bottom of the semi-circular metal sleeve is fixedly connected to the metal sheath of the cable by welding process. (5) Prepare grounding braided wire, and use welding process to weld and fix one end of the grounding braided wire to the tail pipe of the high voltage cable terminal and the metal sheath of the cable respectively. (6) On-site sealing technology is used to seal the repaired area, prevent moisture intrusion, and improve durability.

[0006] In a preferred embodiment of the present invention, in step (2), an automated stripping device is used to strip the outer sheath of the cable. The specific operation is as follows: Secure the cable to ensure stability in the stripped area.

[0007] The thickness of the PE sheath is determined by laser ranging or mechanical positioning. The rotating cutter moves along the axial and circumferential axes of the cable to complete precise stripping. Waste is automatically collected after peeling to avoid pollution.

[0008] In a preferred embodiment of the present invention, in step (2), an automated cleaning device is used to automatically remove the asphalt from the metal sheath of the cable. Specifically, the operation is as follows: The asphalt layer is softened by spraying high-temperature steam or environmentally friendly solvents through automated cleaning equipment. Then use a rotating brush or high-pressure airflow to remove the residual asphalt; At the same time, a dust collection device is used to absorb the pollutants generated on site and keep the site clean.

[0009] In a preferred embodiment of the present invention, in step (3), a sleeve forming machine is used to fix two semi-circular metal sleeves onto the outside of the metal sheath of the cable. The sleeve forming machine includes two semi-circular forming molds and a forming drive mechanism for driving the two semi-circular forming molds to open and close. The concave sides of the two semi-circular forming molds are provided with spiral grooves that cooperate with the spiral tube of the metal sheath of the cable. The spiral grooves of the two semi-circular forming molds are connected in series. The bottom of the semi-circular metal sleeves and the semi-circular forming molds are both spiral structures, and the spiral grooves are located at the bottom of the semi-circular forming molds. First, place two semi-circular metal sleeves on the outside of the cable's metal sheath. Then, bring the two opened semi-circular forming molds close to the two semi-circular metal sleeves, so that the spiral grooves at the bottom of the semi-circular forming molds are aligned with the bottom of the semi-circular metal sleeves. The forming drive mechanism drives the two semi-circular forming molds to press the two semi-circular metal sleeves together. The spiral grooves of the semi-circular forming molds press the bottom of the semi-circular metal sleeves onto the spiral tube of the cable's metal sheath, so that the bottom of the semi-circular metal sleeves is deformed into a spiral structure with an arc cross section and conforms to the spiral tube of the metal sheath.

[0010] Furthermore, the forming drive mechanism includes a hydraulic clamp power unit and a synchronous extrusion transmission assembly. The synchronous extrusion transmission assembly includes a synchronous extrusion rack and a synchronous extrusion gear. Two synchronous extrusion racks are provided, one of which is fixedly connected to the drive end of the hydraulic clamp power unit. The synchronous extrusion gear meshes between the two synchronous extrusion racks. The two synchronous extrusion racks are respectively fixedly connected to two semi-circular forming dies. With this structure, during the sleeve forming process, the hydraulic clamp power unit drives one synchronous extrusion rack to move linearly, while the synchronous extrusion gear drives the other synchronous extrusion rack to move synchronously, causing the two synchronous extrusion racks to move towards each other, actively approaching the two semi-circular metal sleeves until the two semi-circular metal sleeves are pressed onto the metal sheath. Compared to the forming and extrusion operations of existing conventional hydraulic clamps, this solution's two synchronous extrusion racks actively approach the two semi-circular metal sleeves, ensuring uniform force and synchronous deformation of the two semi-circular metal sleeves during radial extrusion forming. This avoids problems such as sleeve displacement, skewing, or excessively deep local indentations that are easily caused by traditional single-sided extrusion methods. This not only improves the forming quality but also prevents the cable itself from being damaged by extrusion. Furthermore, the operator only needs to control the hydraulic clamp power unit to achieve synchronous closure of the two semi-circular forming dies, eliminating the need for manual adjustment of the extrusion positions on both sides, simplifying the operation process and reducing construction difficulty. Especially in space-constrained working environments such as cable trenches and tunnels, this structural design is easier to carry and operate, effectively shortening on-site construction time and improving repair efficiency. Furthermore, from the perspective of molding quality, synchronous extrusion ensures that the bottom of the semi-circular metal sleeve deforms uniformly under the guidance of the spiral groove, so that it fits tightly with the spiral tube structure of the cable metal sheath. The uniform extrusion pressure helps to form a continuous mechanical interlocking structure between the semi-circular metal sleeve and the metal sheath, enhancing the tensile strength and vibration resistance of the connection, and avoiding the risk of loosening or falling off later due to local stress concentration.

[0011] Furthermore, a positioning plate is provided on the semi-circular forming mold corresponding to the end of the spiral groove. This positioning plate is located on one side of the opening at the end of the spiral groove. When the spiral groove mates with the crest of the spiral tube of the metal sheath, the bottom of the positioning plate is located in the trough adjacent to that crest. In the forming operation state, the positioning plate is used as a reference to align with the corresponding trough of the spiral tube of the metal sheath to achieve axial positioning. Then, the semi-circular metal sleeve is rotated until it is blocked by the positioning plate to achieve circumferential positioning, and then the radial extrusion forming operation begins. Through the above structure, when the spiral groove mates with the crest of the spiral tube of the metal sheath, the bottom of the positioning plate falls exactly into the adjacent trough, thereby achieving precise axial positioning. This allows the operator to quickly determine the axial position of the semi-circular metal sleeve on the metal sheath when installing it, avoiding installation offset caused by visual error and ensuring that the bottom of the semi-circular metal sleeve corresponds accurately to the trough position of the spiral tube. Furthermore, in terms of circumferential positioning, the operator can use the positioning plate as a reference and rotate the semi-circular metal sleeve until it is blocked by the positioning plate to complete the precise circumferential positioning. This operation method is simple and intuitive, without the need for additional measuring tools or complicated calibration steps, which effectively reduces the dependence of on-site construction on the operator's experience level and improves the consistency and repeatability of installation.

[0012] Furthermore, the concave wall of the semi-circular forming mold is provided with a spiral protrusion, and the spiral groove is provided on the spiral protrusion for pressing the bottom of the semi-circular metal sleeve onto the spiral tube of the metal sheath of the cable.

[0013] In a preferred embodiment of the present invention, in step (4), welding is performed using argon arc welding or ultrasonic welding equipment, and an oxide film treatment device is provided. The specific operation is as follows: Pre-treat the surface of the semi-circular metal sleeve using chemical or mechanical methods to remove the oxide film; Argon arc welding or ultrasonic welding technology is used to weld the semi-circular metal sleeve to the tail tube of the high-voltage cable terminal and the metal sheath of the cable. Real-time monitoring of welding temperature and current ensures uniform weld seam.

[0014] Furthermore, the weld seam between the bottom of the semi-circular metal sleeve and the metal sheath of the cable is spiral-shaped.

[0015] In a preferred embodiment of the present invention, in step (5), a special welding device for braided wire is used, combined with resistance welding or laser welding technology, to weld and fix the braided wire. The specific operation is as follows: Secure the grounding braided wire to the surface of the tailpipe and the metal sheath of the cable, ensuring the contact surfaces are clean; Using resistance welding or laser welding techniques, braided wires are welded to the tail tube and the metal sheath of the cable. Check the resistance of the solder joints to ensure proper grounding.

[0016] In a preferred embodiment of the present invention, in step (6), a portable thermoforming device is used to seal the repair area, equipped with a mold and sealing material. The specific operation is as follows: Apply high-performance sealant to the repaired area; The repaired area is sealed using a thermoforming device; Check the airtightness and waterproof performance of the sealing layer.

[0017] Furthermore, after molding, a protective layer is formed. One end of the protective layer is wrapped around the tail tube, and the other end is wrapped around the outer sheath of the cable.

[0018] Compared with the prior art, the present invention has the following advantages: 1. By removing the original defective structure, reinstalling the semi-circular metal sleeve, and fixing it with welding, the traditional manual lead-lined repair method is replaced, which significantly improves the repair quality and construction consistency.

[0019] 2. This invention uses two semi-circular metal sleeves in conjunction with a pre-tightening structure for fixation, which facilitates rapid on-site installation and can adapt to cable metal sheaths of different sizes, thus improving the flexibility and adaptability of construction.

[0020] 3. This invention reliably connects the semi-circular metal sleeve to the tail tube of the high-voltage cable accessory and the metal sheath of the cable through welding process, ensuring grounding continuity and mechanical strength, and effectively solving the safety hazards caused by defects such as lead enamel peeling, breakage, and bubbles.

[0021] 4. This invention introduces grounding braided wire for auxiliary grounding connection, which further enhances the reliability of the grounding system; at the same time, it combines on-site plastic sealing technology to seal the repair area, effectively preventing moisture intrusion and improving the long-term operational stability after repair. Attached Figure Description

[0022] Figure 1 This is a simplified structural diagram of the high-voltage cable accessory grounding lead-lined structure of the present invention.

[0023] Figure 2 This is a simplified structural diagram of the high-voltage cable accessory after grounding lead lining repair according to the present invention.

[0024] Figure 3 This is a simplified structural diagram of the stripping of the outer sheath of the cable during the grounding lead-lined repair of the high-voltage cable accessory of the present invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the forming process using a sleeve forming machine according to the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of the sleeve forming machine of the present invention.

[0027] Figure 6 This is a partial three-dimensional structural diagram of the sleeve forming machine of the present invention.

[0028] Figures 7-8 This is a front view of the high-voltage cable, the semi-circular metal sleeve, and the semi-circular forming mold of the present invention in two different states.

[0029] Figure 9 for Figure 8 A magnified view of X in the image. Detailed Implementation

[0030] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0031] Combination Figure 2 The method for repairing poor lead lining of high-voltage cable accessories in this embodiment includes the following steps: (1) Remove the lead-lined structure and its covering layer at the grounding point of the high-voltage cable accessories. (2) Strip the outer sheath 1 of the cable according to the actual situation; clean the impurities on the surface of the metal sheath 2 of the cable.

[0032] (3) Prepare two semi-circular metal sleeves 3 and put them on the outside of the metal sheath 2 of the cable. The two semi-circular metal sleeves 3 are fixed by a pre-tightening structure (copper wire can be used for binding, and the structure is removed after welding).

[0033] (4) The top of the semi-circular metal sleeve 3 is fixedly connected to the tail tube 4 of the high-voltage cable accessory by welding process, and the bottom of the semi-circular metal sleeve 3 is fixedly connected to the metal sheath 2 of the cable by welding process.

[0034] (5) Prepare grounding braided wire 5, and use welding process to weld and fix one end of the grounding braided wire 5 to the tail tube 4 of the high voltage cable terminal and the metal sheath 2 of the cable respectively.

[0035] (6) On-site sealing technology is used to seal the repaired area, prevent moisture intrusion, and improve durability.

[0036] Combination Figure 3 In step (2), an automated stripping device is used to strip the outer sheath 1 of the cable. The specific operation is as follows: Secure the cable to ensure stability in the stripped area.

[0037] The thickness of the PE sheath is determined by laser ranging or mechanical positioning.

[0038] The rotating cutter moves along the axial and circumferential directions of the cable to complete precise stripping.

[0039] Waste is automatically collected after peeling to avoid pollution.

[0040] Key technical features: The cutting angle of the blade is adjustable to accommodate different cable diameters; the sensor monitors the stripping depth in real time to avoid damage to the internal conductor or insulation layer.

[0041] Furthermore, in step (2), an automated cleaning device is used to automatically remove the asphalt from the metal sheath 2 of the cable. The specific operation is as follows: The asphalt layer is softened by spraying high-temperature steam or environmentally friendly solvents through automated cleaning equipment.

[0042] Use a rotating brush or high-pressure airflow to remove any remaining asphalt.

[0043] At the same time, a dust collection device is used to absorb the pollutants generated on site and keep the site clean.

[0044] Technical points: The cleaning agent should be environmentally friendly and not damage the cable material; the temperature should be controlled within a safe range to avoid overheating.

[0045] Combination Figures 4-6 A sleeve forming machine is used to fix two semi-circular metal sleeves 3 onto the outside of the metal sheath 2 of the cable. This sleeve forming machine includes two semi-circular forming molds 6 and a forming drive mechanism (using hydraulic drive, etc.) for driving the two semi-circular forming molds 6 to open and close. The concave sides of both semi-circular forming molds 6 are provided with spiral grooves 6-1 that mate with the spiral tube of the metal sheath 2 of the cable. The spiral grooves 6-1 of the two semi-circular forming molds 6 are connected in series. The bottoms of both the semi-circular metal sleeves 3 and the semi-circular forming molds 6 have a spiral structure, and the spiral grooves 6-1 are located on the bottom of the semi-circular forming molds 6. Bottom: First, place the two semi-circular metal sleeves 3 on the outside of the metal sheath 2 of the cable. Then, bring the two opened semi-circular forming molds 6 close to the two semi-circular metal sleeves 3, so that the spiral grooves 6-1 of the semi-circular forming molds 6 are aligned with the bottom of the semi-circular metal sleeves 3. The forming drive mechanism drives the two semi-circular forming molds 6 to press the two semi-circular metal sleeves 3 together. The spiral grooves 6-1 of the semi-circular forming molds 6 press the bottom of the semi-circular metal sleeves 3 onto the spiral tube of the metal sheath 2 of the cable, so that the bottom of the semi-circular metal sleeves 3 is deformed into a spiral structure with an arc cross section and fits tightly with the spiral tube of the metal sheath 2.

[0046] Combination Figures 4-6The forming drive mechanism includes a hydraulic clamp power unit 7 and a synchronous extrusion transmission assembly. The synchronous extrusion transmission assembly includes a synchronous extrusion rack 8 and a synchronous extrusion gear 9. There are two synchronous extrusion racks 8, one of which is fixedly connected to the drive end of the hydraulic clamp power unit 7. The synchronous extrusion gear 9 meshes between the two synchronous extrusion racks 8. The two synchronous extrusion racks 8 are respectively fixedly connected to two semi-circular forming dies 6. With the above structure, in the sleeve forming process, the hydraulic clamp power unit 7 drives one of the synchronous extrusion racks 8 to move linearly, and the synchronous extrusion gear 9 drives the other synchronous extrusion rack 8 to move synchronously, causing the two synchronous extrusion racks 8 to move towards each other, actively approaching the two semi-circular metal sleeves 3, until the two semi-circular metal sleeves 3 are pressed onto the metal sheath 2. Compared to the forming and extrusion operation of existing conventional hydraulic clamps, this solution uses two synchronous extrusion racks 8 that actively approach the two semi-circular metal sleeves 3. This ensures that the two semi-circular metal sleeves 3 are subjected to uniform force and deform synchronously during the radial extrusion forming process. This avoids problems such as sleeve displacement, skewing, or excessively deep local indentations that are easily caused by traditional single-sided extrusion methods. This not only improves the forming quality but also prevents the cable itself from being damaged by extrusion. Moreover, the operator only needs to control the hydraulic clamp power unit 7 to achieve the synchronous closing of the two semi-circular forming dies 6, eliminating the need for manual adjustment of the extrusion positions on both sides. This simplifies the operation process and reduces construction difficulty. Especially in space-constrained working environments such as cable trenches and tunnels, this structural design is easier to carry and operate, effectively shortening on-site construction time and improving repair efficiency. Furthermore, from the perspective of molding quality, synchronous extrusion ensures that the bottom of the semi-circular metal sleeve 3 deforms uniformly under the guidance of the spiral groove 6-1, so that it fits tightly with the spiral tube structure of the cable metal sheath 2. The uniform extrusion force helps to form a continuous mechanical interlocking structure between the semi-circular metal sleeve 3 and the metal sheath 2, enhancing the tensile strength and vibration resistance of the connection part, and avoiding the risk of loosening or falling off later due to local stress concentration.

[0047] Combination Figures 6-9A positioning piece 10 is provided on the semi-circular forming mold 6 corresponding to the end of the spiral groove 6-1. The positioning piece 10 is located on one side of the end opening of the spiral groove 6-1. When the spiral groove 6-1 is engaged with the crest of the spiral tube of the metal sleeve 2, the bottom of the positioning piece 10 is located in the trough adjacent to the crest. In the forming working state, the positioning piece 10 is used as a reference to align it with the trough corresponding to the spiral tube of the metal sleeve 2 to achieve axial positioning. Then, the semi-circular metal sleeve 3 is rotated until it is blocked by the positioning piece 10 to achieve circumferential positioning. Then, the radial extrusion forming operation is started. With the above structure, when the bottom of the alignment plate 10 mates with the crest of the spiral groove 6-1 and the spiral tube of the metal sleeve 2, it falls precisely into the adjacent trough, thus achieving precise axial positioning. This allows operators to quickly determine the axial position of the semi-circular metal sleeve 3 on the metal sleeve 2 during installation, avoiding installation offsets caused by visual errors and ensuring that the bottom of the semi-circular metal sleeve 3 accurately corresponds to the trough position of the spiral tube. Moreover, in terms of circumferential positioning, operators can use the alignment plate 10 as a reference and rotate the semi-circular metal sleeve 3 until it is blocked by the alignment plate to complete precise circumferential alignment. This operation method is simple and intuitive, requiring no additional measuring tools or complex calibration steps, effectively reducing the dependence on the operator's experience level during on-site construction and improving the consistency and repeatability of installation.

[0048] Furthermore, the concave wall of the semi-circular forming mold 6 is provided with a spiral protrusion, and the spiral groove 6-1 is provided on the spiral protrusion for pressing the bottom of the semi-circular metal sleeve 3 onto the spiral tube of the metal sheath 2 of the cable.

[0049] In step (4), welding is performed using argon arc welding or ultrasonic welding equipment, and an oxide film treatment device is provided. The specific operation is as follows: The surface of the semi-circular metal sleeve 3 is pretreated using chemical or mechanical methods to remove the oxide film.

[0050] Argon arc welding or ultrasonic welding technology is used to weld the semi-circular metal sleeve 3 to the tail tube 4 of the high-voltage cable terminal and the metal sheath 2 of the cable.

[0051] Real-time monitoring of welding temperature and current ensures uniform weld seam.

[0052] Key technical points: Breaking through the alumina film is crucial, requiring the use of high-frequency pulse or ultrasonic-assisted technology to improve welding strength; the weld must meet the requirements for electrical conductivity and mechanical strength.

[0053] Furthermore, the weld seam between the bottom of the semi-circular metal sleeve 3 and the metal sheath 2 of the cable is spiral-shaped.

[0054] In step (5), a special welding device for braided wire 5 is used, combined with resistance welding or laser welding technology, to weld and fix the braided wire 5. The specific operation is as follows: Secure the grounding braided wire 5 to the surface of the tail pipe 4 and the metal sheath 2 of the cable, ensuring that the contact surfaces are clean.

[0055] Using resistance welding or laser welding technology, the braided wire 5 is welded to the tail tube 4 and the metal sheath 2 of the cable.

[0056] Check the resistance of the solder joints to ensure proper grounding.

[0057] Key technical points: The welding process must avoid overheating and burning the braided tape; the weld points must be evenly distributed to enhance connection reliability.

[0058] In step (6), a portable heat sealing device is used to seal the repair area, equipped with a mold and sealing material. The specific operation is as follows: Apply high-performance sealant to the repaired area.

[0059] The repair area is sealed using a thermoforming device.

[0060] Check the airtightness and waterproof performance of the sealing layer.

[0061] Key technical points: The sealing material must be resistant to high temperatures, corrosion, and have good insulation properties; the molding process must ensure a seamless connection between the repaired area and the original insulation layer.

[0062] Furthermore, after molding, a protective plastic layer is formed. One end of the protective plastic layer is wrapped around the tail tube 4, and the other end of the protective plastic layer is wrapped around the outer sheath 1 of the cable.

[0063] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for repairing poor lead lining in high-voltage cable accessories, characterized in that, Includes the following steps: (1) Remove the lead-lined structure and its covering layer at the grounding point of the high-voltage cable accessories; (2) Strip the outer sheath of the cable according to the actual situation; clean the impurities on the surface of the metal sheath of the cable; (3) Prepare two semi-circular metal sleeves and put them on the outside of the metal sheath of the cable. The two semi-circular metal sleeves are fixed together by a pre-tightening structure. (4) The top of the semi-circular metal sleeve is fixedly connected to the tail tube of the high-voltage cable accessory by welding process, and the bottom of the semi-circular metal sleeve is fixedly connected to the metal sheath of the cable by welding process. (5) Prepare grounding braided wire, and use welding process to weld and fix one end of the grounding braided wire to the tail pipe of the high voltage cable terminal and the metal sheath of the cable respectively. (6) Use on-site sealing technology to seal the repaired area.

2. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (2), an automated stripping device is used to strip the outer sheath of the cable. The specific operation is as follows: Secure the cable to ensure stability in the stripped area; The thickness of the PE sheath is determined by laser ranging or mechanical positioning. The rotating cutter moves along the axial and circumferential axes of the cable to complete precise stripping. Waste is automatically collected after peeling to avoid pollution.

3. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (2), an automated cleaning device is used to automatically remove the asphalt from the metal sheath of the cable. The specific operation is as follows: The asphalt layer is softened by spraying high-temperature steam or environmentally friendly solvents through automated cleaning equipment. Then use a rotating brush or high-pressure airflow to remove the residual asphalt; At the same time, a dust collection device is used to absorb the pollutants generated on site and keep the site clean.

4. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (3), a sleeve forming machine is used to fix two semi-circular metal sleeves on the outside of the metal sheath of the cable. The sleeve forming machine includes two semi-circular forming molds and a forming drive mechanism for driving the two semi-circular forming molds to open and close. The concave sides of the two semi-circular forming molds are provided with spiral grooves that cooperate with the spiral tube of the metal sheath of the cable. The spiral grooves of the two semi-circular forming molds are connected in series. The bottom of the semi-circular metal sleeves and the semi-circular forming molds are both spiral structures, and the spiral grooves are located at the bottom of the semi-circular forming molds. The concave wall of the semi-circular forming mold is provided with a spiral protrusion, and the spiral groove is provided on the spiral protrusion for pressing the bottom of the semi-circular metal sleeve onto the spiral tube of the metal sheath of the cable. First, place two semi-circular metal sleeves on the outside of the cable's metal sheath. Then, bring the two opened semi-circular forming molds close to the two semi-circular metal sleeves, so that the spiral grooves at the bottom of the semi-circular forming molds are aligned with the bottom of the semi-circular metal sleeves. The forming drive mechanism drives the two semi-circular forming molds to press the two semi-circular metal sleeves together. The spiral grooves of the semi-circular forming molds press the bottom of the semi-circular metal sleeves onto the spiral tube of the cable's metal sheath, so that the bottom of the semi-circular metal sleeves is deformed into a spiral structure with an arc cross section and conforms to the spiral tube of the metal sheath.

5. The method for repairing poor lead lining of high-voltage cable accessories according to claim 4, characterized in that, The forming drive mechanism includes a hydraulic clamp power unit and a synchronous extrusion transmission assembly. The synchronous extrusion transmission assembly includes a synchronous extrusion rack and a synchronous extrusion gear. There are two synchronous extrusion racks, one of which is fixedly connected to the drive end of the hydraulic clamp power unit. The synchronous extrusion gear meshes between the two synchronous extrusion racks. The two synchronous extrusion racks are respectively fixedly connected to two semi-circular forming dies.

6. The method for repairing poor lead enamel grounding in high-voltage cable accessories according to claim 4, characterized in that, A positioning plate is provided on the semi-circular forming die corresponding to the end of the spiral groove. The positioning plate is set on one side of the end opening of the spiral groove. When the spiral groove matches the crest of the spiral tube of the metal sheath, the bottom of the positioning plate is located in the trough adjacent to the crest. In the forming working state, the positioning plate is used as a reference to align it with the trough corresponding to the spiral tube of the metal sheath to achieve axial positioning. Then, the semi-circular metal sleeve is rotated until it is blocked by the positioning plate to achieve circumferential positioning. Then, the radial extrusion forming operation begins.

7. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (4), welding is performed using argon arc welding or ultrasonic welding equipment, and an oxide film treatment device is provided. The specific operation is as follows: Pre-treat the surface of the semi-circular metal sleeve using chemical or mechanical methods to remove the oxide film; Argon arc welding or ultrasonic welding technology is used to weld the semi-circular metal sleeve to the tail pipe of the high-voltage cable terminal and the metal sheath of the cable; the weld seam between the bottom of the semi-circular metal sleeve and the metal sheath of the cable is spiral. Real-time monitoring of welding temperature and current ensures uniform weld seam.

8. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (5), a special welding device for braided wire is used, combined with resistance welding or laser welding technology, to weld and fix the braided wire. The specific operation is as follows: Secure the grounding braided wire to the surface of the tailpipe and the metal sheath of the cable, ensuring the contact surfaces are clean; Using resistance welding or laser welding techniques, braided wires are welded to the tail tube and the metal sheath of the cable. Check the resistance of the solder joints to ensure proper grounding.

9. The method for repairing poor lead lining of high-voltage cable accessories according to claim 1, characterized in that, In step (6), a portable heat sealing device is used to seal the repair area, equipped with a mold and sealing material. The specific operation is as follows: Apply high-performance sealant to the repaired area; The repaired area is sealed using a thermoforming device; Check the airtightness and waterproof performance of the sealing layer.

10. The method for repairing poor lead lining of high-voltage cable accessories according to claim 9, characterized in that, After molding, a protective plastic layer is formed. One end of the protective plastic layer is wrapped around the tail tube, and the other end of the protective plastic layer is wrapped around the outer sheath of the cable.

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