Temporary ground wire device for overhead line and installation method thereof

Abstract

The application discloses an overhead line temporary grounding wire device and a mounting method, and relates to the technical field of electrical engineering, in particular to an overhead line temporary grounding wire device and a mounting method. The device comprises an insulating operating rod, a grounding soft copper wire, a grounding end wire clamp and a wire end clamping mechanism. The insulating operating rod is connected into a hollow structure by a first circular shell and a second circular shell, is precisely positioned by a butt joint groove and a positioning block, is fastened through a threaded sleeve, and is internally provided with a protective layer wrapping the grounding soft copper wire. The wire end clamping mechanism comprises symmetrically arranged rotating clamping plates, a locking driving assembly and a tension spring. The locking driving assembly is composed of a threaded locking ring, a sliding block and an inclined clamping groove, and the clamping force is controllable and maintained through threaded self-locking. The grounding soft copper wire is connected with two rotating clamping plates to form parallel double channels. The application solves the problem of unstable clamping and easy virtual connection and loosening of traditional wire clamps, realizes self-adaptive stable clamping of different wire diameters, and is suitable for temporary grounding protection of power line outage maintenance operation.

Description

Technical Field

[0001] This invention relates to the field of power line safety protection equipment technology, specifically to a temporary grounding wire device and installation method for overhead lines. Background Technology

[0002] During power line outage maintenance, temporary grounding wires are a key technical measure to prevent injuries from sudden power restoration and induced electric shocks, ensuring the safety of workers. According to the "Electric Power Safety Work Regulations" (GB 26859-2011) and DL / T879-2004 "Portable Grounding and Grounding Short-Circuit Devices for Live Working," reliable temporary grounding wires must be installed at both ends of the work site during power outage maintenance. The grounding wires should have sufficient mechanical strength and stable electrical connections, and the installation and operation should be simple and reliable.

[0003] The existing grounding wire clamps mainly include the following three types: 1. Screw-type clamp: This type of clamp directly compresses the conductor by rotating an insulating rod to drive a screw. Although the clamping force can be adjusted, the screw end is in direct contact with the conductor, which can easily damage the conductor surface. Furthermore, the relationship between the number of screw rotations and the clamping force is difficult to quantify and control, and operators rely entirely on feel, resulting in inconsistent installation quality.

[0004] 2. Spring hook type wire clamp: Relying on torsion springs or tension springs to provide clamping force, the opening size is fixed. For thinner wires, excessive clamping gap leads to poor contact; for thicker wires, the wire cannot fully enter the clamp, resulting in a "lack of connection". In actual operation, accidents caused by spring fatigue or vibration leading to a decrease in clamping force and grounding wire detachment occur frequently.

[0005] 3. Cam-locking wire clamp: This type of clamp uses a cam mechanism to achieve rapid clamping. However, after the cam profile wears down, the clamping force decreases significantly, resulting in insufficient reliability. Furthermore, the cam structure is complex, making it inconvenient to operate when working at heights.

[0006] The common technical problems existing in the above-mentioned prior art include: ① Defects in the structure of the insulating operating rod: It mostly adopts an integral solid structure, with the grounding soft copper wire exposed or simply sleeved, which causes the insulation layer to be damaged due to long-term friction with the inner wall of the rod; the operating rod is not detachable, making it difficult to inspect and replace the internal circuit, and it occupies a lot of space for transportation and storage; ② Insufficient reliability of electrical connection: The grounding soft copper wire and the wire end clamp are mostly connected in series at a single point. Once the connection point is loose or broken, the entire grounding circuit fails, posing a serious safety hazard.

[0007] To address the aforementioned issues, there is an urgent need for a temporary grounding device that can adapt to conductors of different diameters, provide a secure and reliable clamping mechanism, facilitate maintenance, and offer electrical redundancy protection. Summary of the Invention

[0008] The technical problem to be solved by this invention is to provide a temporary grounding wire device and installation method for overhead lines. Through innovative mechanical structure design and electrical connection method, it can achieve stable clamping of overhead conductors of different diameters and solve the problems of loose connection and loosening of traditional wire clamps. At the same time, the parallel dual-path structure improves the grounding reliability, reduces the difficulty of high-altitude operation, and ensures the safety of power line outage maintenance operations.

[0009] The technical solution adopted by this invention to solve the technical problem is as follows: A temporary grounding wire device for overhead lines includes an insulating operating rod, a grounding soft copper wire, a grounding end clamp, and a conductor end clamping mechanism. The insulating operating rod has a hollow structure, consisting of a first annular shell and a second annular shell connected together. The inner side of the first annular shell is provided with a mating groove, and the inner side of the second annular shell is provided with a positioning block adapted to the mating groove. The precise alignment of the two annular shells is achieved through the precise cooperation between the mating groove and the positioning block. The outer ends of the first and second annular shells are provided with first threaded portions. The two annular shells are fastened together by screwing a threaded sleeve into the first threaded portion. This mating structure ensures the overall strength and insulation performance of the insulating operating rod, and facilitates the inspection, replacement, and maintenance of the internal grounding soft copper wire.

[0010] The insulating operating rod has a protective layer inside, which is a rubber layer or a polyurethane layer, tightly attached to the inner wall of the two annular shells. The grounding soft copper wire passes through the protective layer to avoid direct contact with the shell and thus prevent wear. The protective layer has a uniform thickness, sufficient to wrap the grounding soft copper wire and prevent it from directly contacting the inner wall of the shell.

[0011] The conductor end clamping mechanism is located at the top of the insulating operating rod and includes two symmetrically arranged rotating clamping plates, a locking drive assembly, and a spring; each rotating clamping plate has a conductor end arc-shaped clamping plate connected to its top, the arc openings of the two conductor end arc-shaped clamping plates are arranged opposite each other, and the lower part of the rotating clamping plate is hinged to the mounting block at the top of the insulating operating rod by a pin.

[0012] The locking drive assembly includes a threaded locking ring threadedly connected to the insulating operating rod and a sliding block that can slide along the axial direction of the insulating operating rod. The sliding block has an inclined slot, and the bottom of the rotating clamping plate is embedded and abuts within the slot. Two slots are symmetrically formed on the sliding block, and the bottoms of the two rotating clamping plates are respectively embedded and abutting within their corresponding slots. The bottom of the sliding block has an arc-shaped mating ring, which is located on the moving path of the threaded locking ring and abuts against the lower end face of the threaded locking ring, so that when the threaded locking ring rotates upward, it pushes the sliding block upward, thereby driving the two rotating clamping plates closer together through the slots.

[0013] The spring is a tension spring, connected to the middle of the clamping arms of the two rotating clamping plates, so that the clamping mechanism remains in the open state.

[0014] One end of the grounding soft copper wire is electrically connected to the grounding terminal clamp, and the other end branches out from both sides of the top of the insulating operating rod, respectively fixedly connected to the inner surface of the two rotating clamping plates. The two branches of the grounding soft copper wire are of equal length and cross-sectional area, and their connection points with the two rotating clamping plates are symmetrically arranged about the axis of the insulating operating rod, forming a parallel double-path structure.

[0015] Preferably, the arc-shaped clamping plate at the conductor end is connected to the top of the rotating clamping plate via a threaded rod, the front end of the threaded rod is rotatably connected to the arc-shaped clamping plate at the conductor end, and the inner wall of the arc-shaped clamping plate at the conductor end is provided with anti-slip teeth.

[0016] Preferably, the outer wall of the threaded locking ring is provided with anti-slip texture.

[0017] Preferably, the threaded rod is equipped with a locking nut to prevent loosening after adjustment; the adjustment stroke of the threaded rod is 10mm to 30mm to accommodate overhead conductors of different diameters.

[0018] Preferably, the inner cavity formed after the first and second annular shells are mated has a circular cross-section, and the mating groove and the positioning block are in clearance fit with a gap of no more than 0.5 mm to ensure the coaxiality and positioning accuracy when the two annular shells are mated.

[0019] The present invention also provides a method for installing the above-mentioned temporary grounding wire device for overhead lines, comprising the following steps: S1. Installation Preparation: Check the integrity of each component of the device, confirm that the insulating operating rod is free from damage and cracks, the grounding soft copper wire is free from broken strands and oxidation, the conductor end clamping mechanism opens and closes smoothly, the threaded locking ring rotates flexibly without jamming, and the spring force is normal; prepare the necessary insulating gloves and high-voltage detector for the operation, perform phase-by-phase voltage testing on the overhead line under power outage maintenance, and after confirming that the line has no voltage, set up safety warning signs at the work site; according to the actual diameter of the overhead conductor to be clamped, finely adjust the extension length of the arc-shaped clamp at the conductor end by rotating the threaded rod so that the arc opening of the arc-shaped clamp matches the outer diameter of the conductor; S2. Grounding terminal fixing: Clamp the grounding terminal clamp onto a qualified grounding body, and secure the grounding terminal clamp firmly through the clamp's own locking mechanism to ensure reliable electrical connection between the grounding terminal and the grounding body; arrange the grounding soft copper wire along the insulating operating rod to prevent it from twisting or knotting, and ensure that the grounding soft copper wire hangs naturally. S3. Wire end clamping alignment: The operator wears insulated gloves and holds an insulated operating rod. Under the elastic force of the spring, the wire end clamping mechanism remains in a naturally open state. Align the two arc-shaped clamps at the wire end with the overhead wire to be grounded, so that the wire is between the arc openings of the two arc-shaped clamps. Slowly adjust the grip angle and height of the insulated operating rod to ensure that the arc-shaped clamps at the wire end are fully aligned with the overhead wire without any deviation or jamming. S4. Conductor End Locking and Clamping: Keep the insulating operating rod in a fixed position, and manually rotate the threaded locking ring on the insulating operating rod to move it upward along the axial direction of the insulating operating rod. The end face of the threaded locking ring pushes the sliding block to slide upward synchronously through the arc-shaped mating ring. During the upward movement of the sliding block, its inclined groove surface interacts with the bottom of the rotating clamping plate, converting the linear motion of the sliding block into the rotational motion of the rotating clamping plate around the pin shaft, driving the tops of the two rotating clamping plates to come together until the inner wall of the arc-shaped clamping plate at the conductor end is in close contact with the overhead conductor. Continue to tighten the threaded locking ring and apply sufficient locking force. After the threaded locking ring stops rotating, the clamping state of the rotating clamping plate is maintained.

[0020] S5. Installation Inspection: Inspect the connection points between the grounding soft copper wire and the rotating clamping plate and the grounding end clamp, and confirm that the connecting bolts are tight and not loose, and that the parallel dual-path structure of the grounding soft copper wire is complete; check the fit between the anti-slip teeth on the inner wall of the arc-shaped clamping plate at the conductor end and the conductor, and confirm that the contact area of ​​the clamping surface meets the electrical connection requirements; conduct an overall inspection of the installation status of the grounding wire device, and confirm that the insulating operating rod is not deformed by stress, and that the grounding soft copper wire is not taut or damaged; S6. Dismantling Operation: After the maintenance is completed, the operator wears insulated gloves, holds the insulated operating rod, and rotates the threaded locking ring in the opposite direction, causing it to move downward along the axial direction of the insulated operating rod. The sliding block moves downward synchronously with the threaded locking ring, and the rotating clamping plate automatically rotates and opens around the pin under the elastic force of the spring, completely separating the arc-shaped clamping plate at the conductor end from the overhead conductor. Following the principle of "dismantling the conductor end first, then the grounding end", the insulated operating rod and the conductor end clamping mechanism are first moved away from the overhead conductor, and then the connection between the grounding end clamp and the grounding body is removed. The grounding soft copper wire and the insulated operating rod are tidied up, and all parts of the device are cleaned and stored away.

[0021] This invention achieves stable clamping and reliable grounding of overhead conductors through a composite mechanism of threaded locking, inclined plane transmission, and elastic reset. The core of this invention lies in using the self-locking characteristics of the threaded pair to maintain the clamping force, converting linear motion into rotary clamping motion through the inclined slot, and adopting a parallel dual-path structure to improve electrical reliability.

[0022] The mechanical clamping principle of this invention is as follows: 1. Clamping process: Rotating the threaded locking ring clockwise causes it to rise axially along the insulating operating rod. Its lower end face abuts against the arc-shaped connecting ring and pushes the sliding block upward synchronously. During the upward movement of the sliding block, the inclined surface of the inclined slot interacts with the bottom of the rotating clamping plate, generating a horizontal component force that drives the two rotating clamping plates to rotate inward around the pin axis and close. The arc-shaped clamping plate at the conductor end gradually approaches and finally clamps the overhead conductor. After stopping the rotation of the threaded locking ring, because the friction angle of the threaded pair is less than the thread helix angle, a mechanical self-locking is formed, and the sliding block cannot slide down on its own. The clamping state of the rotating clamping plate is maintained. At this time, even if subjected to external vibration or wind force, the clamping force will not decrease. 2. Unlocking process: Rotating the threaded locking ring counterclockwise causes it to descend. The sliding block loses support and moves downward under the action of gravity and spring tension. The rotating clamping plate rotates outward under the action of the spring, and the arc-shaped clamping plate at the conductor end automatically opens, achieving rapid release.

[0023] The elastic reset principle of this invention is as follows: The spring is a tension spring connected to the middle of the clamping arms of the two rotating clamping plates. In the free state, the spring tension keeps the clamping mechanism open, facilitating wire alignment. When clamping, the rotating clamping plates rotate inward, causing the spring to extend and store energy; when releasing, the spring contracts and releases energy, driving the rotating clamping plates to quickly reset to the open state. Only the clamping process requires force to rotate; the releasing process is automatically completed by the spring, significantly reducing operational intensity.

[0024] The electrical connection principle of this invention is as follows: the ends of the grounding soft copper wire are symmetrically connected to two rotating clamping plates to form an electrical parallel structure; during normal operation, both branches are simultaneously conductive, shunting the current and reducing the current density of a single circuit; when any branch is poorly connected due to vibration or loosening, the other branch maintains the grounding path to avoid overall grounding failure; the two branches have equal lengths and cross-sectional areas, and their connection positions are symmetrically arranged about the axis of the insulating operating rod to ensure consistent electrical parameters, balanced current distribution, and stable contact resistance.

[0025] The assembly principle of the insulating operating rod in this invention is as follows: the first annular shell and the second annular shell are radially and circumferentially positioned by the precise fit of the mating groove and the positioning block, and then they are fastened together by the screwing of the threaded sleeve and the threaded part. This mating structure not only ensures the overall strength and insulation performance of the insulating operating rod, but also facilitates on-site disassembly and assembly. The internal grounding soft copper wire is easy to inspect, replace and maintain. The internal protective layer is made of rubber or polyurethane material, which is tightly attached to the inner wall of the shell, wrapping the grounding soft copper wire and preventing it from directly contacting the metal shell and causing wear, while providing reliable insulation isolation.

[0026] The installation method of this invention is as follows: 1. In the installation preparation stage, the extension length of the arc-shaped clamp plate at the conductor end is adjusted by rotating the threaded rod to pre-match the arc opening with the diameter of the conductor to be clamped, thereby improving alignment efficiency; 2. In the grounding end fixing stage, the grounding end clamp forms a low-impedance electrical connection with the grounding body to establish a safe grounding reference; 3. In the conductor end alignment stage, the spring pretension is used to keep the clamping mechanism open, providing sufficient operating space to place the conductor between the two arc-shaped clamp plates; 4. In the locking and clamping stage, the threaded locking ring is rotated, and through the sequential transmission of the arc-shaped docking ring, sliding block, and inclined slot, the rotating clamping plate is driven to close and clamp, and finally the thread self-locking is used to maintain the clamping state; 5. In the dismantling operation stage, the threaded locking ring is rotated in the opposite direction to release the self-locking, and the spring drives the clamping mechanism to open automatically. The conductor end is dismantled first, followed by the grounding end, to ensure operational safety.

[0027] Compared with the prior art, the present invention has the following significant advantages: 1. Stable and reliable clamping: This invention uses the precise cooperation of the threaded locking ring, sliding block and inclined slot to convert the rotational motion into the closing motion of the rotating clamping plate, realizing precise control and long-term maintenance of the clamping force; the self-locking characteristics of the threaded pair ensure that the clamping state will not loosen due to vibration, wind or external pulling; with the adjustable arc-shaped clamping plate at the conductor end, it can adapt to overhead conductors of different diameters, completely solving the problems of unstable clamping and easy loose connection of traditional fixed open wire clamps.

[0028] 2. Excellent anti-loosening performance: The self-locking characteristics of the threaded pair combined with the mechanical engagement of the anti-slip teeth form a double anti-loosening guarantee, which can maintain a reliable clamping state even under harsh weather conditions.

[0029] 3. Strong electrical safety: The grounding soft copper wire is connected in parallel to two rotating clamping plates to form a dual-path electrical connection; even if the connection point of any branch becomes loose, the other branch can still maintain the grounding path, which significantly improves the reliability of grounding protection and fundamentally eliminates the safety hazards caused by single-point failure.

[0030] 4. Simple and safe operation: The installation method is standardized and the steps are clear. The clamping and loosening can be achieved by rotating the threaded locking ring without the need for additional tools, which reduces the difficulty and risk of working at height.

[0031] 5. Extended service life: The dual-type insulated operating rod structure is easy to disassemble and assemble, and the internal protective layer effectively protects the grounding soft copper wire, avoiding the wear problems common in traditional structures and extending the service life of the insulated operating rod. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the temporary grounding wire device for overhead lines according to the present invention; Figure 2This is a schematic diagram of the disassembled structure of the first annular shell and the second annular shell in this invention; Figure 3 This is a schematic diagram of the structure of the second annular shell and protective layer components in this invention; Figure 4 This is a schematic diagram of the wire end clamping mechanism and locking drive assembly components in this invention; Figure 5 This is a schematic diagram of the connection structure between the rotating clamping plate and the arc-shaped clamping plate at the end of the wire in this invention; Figure 6 This is a schematic diagram of the sliding block and threaded locking ring components in this invention.

[0033] In the various attached figures: 1--Insulating operating rod, 101--First circular housing, 102--Second circular housing, 2--Grounding soft copper wire, 3--Grounding end clamp, 4--Rotating clamping plate, 5--Curved clamping plate at the conductor end, 6--Threaded locking ring, 7--Sliding block, 8--Slot, 9--Protective layer, 10--Mating groove, 11--Positioning block, 12--First threaded part, 13--Pin, 14--Mounting block, 15--Threaded rod, 16--Anti-slip teeth, 17--Spring, 18--Curved mating ring, 19--Threaded sleeve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings: Example 1, such as Figures 1 to 6 As shown, a temporary grounding wire device for an overhead line includes an insulating operating rod 1, a grounding soft copper wire 2, a grounding end clamp 3, and a conductor end clamping mechanism. The insulating operating rod 1 has a hollow structure and is composed of a first annular shell 101 and a second annular shell 102 connected together. The inner side of the first annular shell 101 is provided with a mating groove 10, and the inner side of the second annular shell 102 is provided with a positioning block 11 that matches the mating groove 10. The outer sides of both ends of the two annular shells are provided with a first threaded portion 12, and the two annular shells are fastened together by screwing the threaded sleeve 19 with the first threaded portion 12.

[0035] The insulating operating rod 1 has a protective layer 9 inside. The protective layer 9 is a rubber layer or a polyurethane layer, which is tightly attached to the inner wall of the first annular shell 101 and the second annular shell 102. The thickness is uniform and sufficient to wrap the grounding soft copper wire 2 and prevent it from directly contacting the inner wall of the shell. The grounding soft copper wire 2 is inserted inside the protective layer 9.

[0036] One end of the grounding soft copper wire 2 is electrically connected to the grounding terminal clamp 3, and the other end is divided into two branches that are fixedly connected to the inner surfaces of the two rotating clamping plates 4. The two branches have equal lengths and equal cross-sectional areas, and their connection points with the two rotating clamping plates 4 are symmetrically arranged about the axis of the insulating operating rod 1, forming a parallel double-path structure.

[0037] The conductor end clamping mechanism is located at the top of the insulating operating rod 1, and includes two symmetrically arranged rotating clamping plates 4, a locking drive assembly, and a spring 17; each rotating clamping plate 4 has a conductor end arc-shaped clamping plate 5 connected to its top, and the arc openings of the two conductor end arc-shaped clamping plates 5 are arranged opposite each other. The lower part of the rotating clamping plate 4 is hinged to the mounting block 14 at the top of the insulating operating rod 1 via a pin 13.

[0038] The locking drive assembly includes a threaded locking ring 6 that is threadedly connected to the insulating operating rod 1 and a sliding block 7 that can slide along the axial direction of the insulating operating rod 1; two symmetrically arranged slots 8 are provided on the sliding block 7, and the bottoms of the two rotating clamping plates 4 are respectively embedded and fitted into the corresponding slots 8. The slots 8 are inclined, and the bottoms of the rotating clamping plates 4 are fitted with the inclined surfaces of the slots 8.

[0039] An arc-shaped mating ring 18 is provided at the bottom of the sliding block 7. The arc-shaped mating ring 18 is located on the moving path of the threaded locking ring 6 and abuts against the lower end face of the threaded locking ring 6. The outer diameter of the arc-shaped mating ring 18 is equal to or slightly smaller than the inner diameter of the threaded locking ring 6. When the threaded locking ring 6 rotates and rises, it pushes the sliding block 7 to move upward, and then drives the two rotating clamping plates 4 to move closer to each other through the slot 8. After the threaded locking ring 6 stops rotating, it uses the self-locking characteristic of the thread pair to maintain the clamping state of the rotating clamping plates 4, and will not loosen due to external force. Anti-slip texture is provided on the outer wall of the threaded locking ring 6.

[0040] Spring 17 is a tension spring, connected to the middle of the clamping arms of the two rotating clamping plates 4, so that the clamping mechanism remains in the open state.

[0041] One end of the grounding soft copper wire 2 is electrically connected to the grounding terminal clamp 3, and the other end is divided into two branches that are fixedly connected to the inner surfaces of the two rotating clamping plates 4. The two branches have equal lengths and equal cross-sectional areas, and their connection points with the two rotating clamping plates 4 are symmetrically arranged about the axis of the insulating operating rod 1.

[0042] The inner cavity formed by the mating of the first annular shell 101 and the second annular shell 102 has a circular cross section. The mating groove 10 and the positioning block 11 are in clearance fit, and the clearance is no more than 0.5 mm.

[0043] Example 2: The difference between this example and Example 1 is that the arc-shaped clamping plate 5 at the conductor end is connected to the top of the rotating clamping plate 4 through the threaded rod 15, the front end of the threaded rod 15 is rotatably connected to the arc-shaped clamping plate 5 at the conductor end, and the inner wall of the arc-shaped clamping plate 5 at the conductor end is provided with anti-slip teeth 16; a locking nut is provided on the threaded rod 15, and the adjustment stroke of the threaded rod 15 is 10mm to 30mm.

[0044] The installation method of the device described in Example 3, Example 1, or Example 2 includes the following steps: S1. Installation preparation: Check the integrity of each component of the device, confirm that the insulating operating rod 1 is undamaged, the grounding soft copper wire 2 is unbroken, the conductor end clamping mechanism opens and closes smoothly, and the threaded locking ring 6 rotates flexibly; according to the diameter of the overhead conductor to be clamped, finely adjust the extension length of the arc-shaped clamp 5 at the conductor end by rotating the threaded rod 15 so that the arc opening of the arc-shaped clamp matches the outer diameter of the conductor. S2. Grounding terminal fixing: Clamp the grounding terminal clamp 3 onto the grounding body and lock it in place, and arrange the grounding soft copper wire 2 so that it hangs down naturally; S3. Wire end clamping alignment: Hold the insulating operating rod 1 and keep the wire end clamping mechanism open under the elastic force of the spring 17. Align the two wire end arc clamps 5 with the overhead wire so that the wire is between the arc openings of the two arc clamps. S4. Wire end locking clamping: Rotate the threaded locking ring 6 to move it upward along the axis of the insulating operating rod 1. The threaded locking ring 6 pushes the sliding block 7 to move upward synchronously through the arc-shaped docking ring 18. During the upward movement of the sliding block 7, the two rotating clamping plates 4 are driven to move closer to each other through the slot 8 until the overhead wire is clamped. After the threaded locking ring 6 stops rotating, the clamping state of the rotating clamping plate 4 is maintained. S5. Installation inspection: Check that the connection points between the grounding soft copper wire 2 and the rotating clamping plate 4 and the grounding end clamp 3 are not loose, and confirm that the arc-shaped clamping plate 5 at the conductor end is in close contact with the conductor, and that the device is stable and reliable as a whole. S6. Dismantling operation: Rotate the threaded locking ring 6 in the reverse direction to move it downwards, and the sliding block 7 moves downwards accordingly. The rotating clamping plate 4 automatically opens under the elastic force of the spring 17, and the arc-shaped clamping plate 5 at the conductor end separates from the overhead conductor. First, remove the conductor end, and then remove the grounding end.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temporary grounding wire device for an overhead line, comprising an insulating operating rod (1), a grounding soft copper wire (2), a grounding end clamp (3), and a conductor end clamping mechanism, characterized in that: The insulating operating rod (1) has a hollow structure and is composed of a first annular shell (101) and a second annular shell (102) connected together. The first annular shell (101) has a mating groove (10) on its inner side, and the second annular shell (102) has a positioning block (11) that matches the mating groove (10) on its inner side. The first annular shell (101) and the second annular shell (102) have a first threaded part (12) on their outer ends. The two annular shells are fastened together by screwing the threaded sleeve (19) with the first threaded part (12). The insulating operating rod (1) has a protective layer (9) inside, and the grounding soft copper wire (2) passes through the protective layer (9). The conductor end clamping mechanism is located at the top of the insulating operating rod (1) and includes two symmetrically arranged rotating clamping plates (4), a locking drive assembly, and a spring (17). Each rotating clamping plate (4) has a conductor end arc-shaped clamping plate (5) connected to its top. The arc openings of the two conductor end arc-shaped clamping plates (5) are arranged opposite to each other. The lower part of the rotating clamping plate (4) is hinged to the mounting block (14) at the top of the insulating operating rod (1) by a pin (13). The locking drive assembly includes a threaded locking ring (6) threadedly connected to the insulating operating rod (1) and a sliding block (7) that can slide along the axial direction of the insulating operating rod (1). (7) An inclined slot (8) is provided on the top. The bottom of the rotating clamping plate (4) is embedded and fits into the slot (8). The bottom of the sliding block (7) is provided with an arc-shaped docking ring (18). The arc-shaped docking ring (18) is located on the moving path of the threaded locking ring (6) and abuts against the lower end face of the threaded locking ring (6) so that when the threaded locking ring (6) rotates and rises, it pushes the sliding block (7) to move upward, and then drives the two rotating clamping plates (4) to move closer to each other through the slot (8). The spring (17) is a tension spring and is connected to the middle of the clamping arms of the two rotating clamping plates (4) so ​​that the clamping mechanism is kept in an open state. One end of the grounding soft copper wire (2) is electrically connected to the grounding terminal clamp (3), and the other end is divided into two branches and fixedly connected to the inner surface of the two rotating clamping plates (4).

2. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The arc-shaped clamp plate (5) at the end of the conductor is connected to the top of the rotating clamp plate (4) via a threaded rod (15). The front end of the threaded rod (15) is rotatably connected to the arc-shaped clamp plate (5) at the end of the conductor. The inner wall of the arc-shaped clamp plate (5) at the end of the conductor is provided with anti-slip teeth (16).

3. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The protective layer (9) is a rubber layer or a polyurethane layer, which is tightly attached to the inner wall of the first annular shell (101) and the second annular shell (102). The thickness of the protective layer (9) is uniform and sufficient to wrap the grounding soft copper wire (2) and prevent it from directly contacting the inner wall of the shell.

4. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The sliding block (7) has two symmetrically arranged slots (8), and the bottoms of the two rotating clamping plates (4) are respectively embedded and attached to the corresponding slots (8).

5. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The two branches of the grounding soft copper wire (2) are of equal length and cross-sectional area, and their connection points with the two rotating clamping plates (4) are symmetrically arranged about the axis of the insulating operating rod (1).

6. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The outer wall of the threaded locking ring (6) is provided with anti-slip texture.

7. The temporary grounding wire device for overhead lines according to claim 2, characterized in that: The threaded rod (15) is equipped with a locking nut; the adjustment stroke of the threaded rod (15) is 10mm to 30mm.

8. The temporary grounding wire device for overhead lines according to claim 1, characterized in that: The inner cavity formed by the first annular shell (101) and the second annular shell (102) after being joined together is circular in cross section. The mating groove (10) and the positioning block (11) are in clearance fit, and the clearance is no more than 0.5mm.

9. A method for installing a temporary grounding wire device for an overhead line as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Installation preparation: Check the integrity of each component of the device, and confirm that the insulating operating rod (1) is undamaged, the grounding soft copper wire (2) is unbroken, the wire end clamping mechanism opens and closes smoothly, and the threaded locking ring (6) rotates flexibly. S2. Grounding end fixing: clamp the grounding end clamp (3) onto the grounding body and lock it, and arrange the grounding soft copper wire (2) so that it hangs down naturally; S3, Wire end clamping alignment: Hold the insulating operating rod (1) and keep the wire end clamping mechanism open under the elastic force of the spring (17). Align the two wire end arc clamps (5) with the overhead wire so that the wire is between the arc openings of the two arc clamps. S4. Wire end locking clamping: Rotate the threaded locking ring (6) to move it upward along the axial direction of the insulating operating rod (1). The threaded locking ring (6) pushes the sliding block (7) to move upward synchronously through the arc-shaped docking ring (18). During the upward movement of the sliding block (7), the two rotating clamping plates (4) are driven to move closer to each other through the slot (8) until the overhead wire is clamped. S5. Installation inspection: Check that the connection points between the grounding soft copper wire (2) and the rotating clamping plate (4) and the grounding end clamp (3) are not loose, and confirm that the arc-shaped clamping plate (5) at the conductor end is in close contact with the conductor. S6. Dismantling operation: Rotate the threaded locking ring (6) in the opposite direction to move it downwards. The sliding block (7) moves downwards accordingly. The rotating clamping plate (4) automatically opens under the elastic force of the spring (17). The arc-shaped clamping plate (5) at the conductor end separates from the overhead conductor. First, remove the conductor end, and then remove the grounding end.

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