A closed fixture device for replacing a monolithic insulator and a replacement method

Abstract

The application discloses a kind of more single insulator closed fixture device and replacement method, including first fixture, second fixture, tightening component and extension joint, first fixture and second fixture are positioned in insulator string respectively, and first fixture and second fixture are connected by two groups of extension joint and tightening component and form retracted bearing structure, first fixture and / or second fixture are made of main and auxiliary card and are connected by pin shaft and profiled joint bolt, nut, the center of main card is semicircular arc body and both sides are symmetrically provided with lug, and connecting hole for connecting extension joint or tightening component is formed in lug, main card and auxiliary card cover are connected by profiled joint bolt, pin shaft and nut combination, and form the central hole for accommodating insulator steel cap after combination. The application can realize the quick positioning and replacement of insulator string cross arm side, wire side and middle arbitrary position insulator, and significantly improve the versatility and operation flexibility of tool.

Description

Technical Field

[0001] This invention relates to the field of insulator inspection and maintenance technology, and in particular to a closed clamp device and method for replacing single insulator pieces. Background Technology

[0002] In overhead transmission lines, insulator strings are crucial components supporting the conductors and ensuring their insulation from the towers. Insulators, due to their high strength and stable performance, are widely used. These insulators consist of tempered glass (ceramic) awnings / discs, steel caps, and steel feet. Multiple units are connected in series via ball joints between the steel caps and feet, and suspended between the conductor and the tower. During long-term operation, insulators may spontaneously explode or break due to lightning strikes, aging, or manufacturing defects, resulting in low-value or zero-value insulators, seriously threatening line safety. In such cases, the faulty insulators must be replaced promptly.

[0003] However, traditional replacement operations face the following technical bottlenecks and safety hazards: (1) The operation method is inefficient and limited: the conventional approach is to replace the entire string of insulators, which involves a large scale of operations, high labor intensity, and a large number of personnel; (2) The existing clamps are not adaptable enough: they cannot replace insulators at any position, and usually require the replacement of the entire string, which poses a safety hazard; (3) The existing operation process is complicated in terms of assembly and disassembly, which further increases the difficulty of operations and safety risks in the harsh environment at high altitudes, seriously affecting the replacement efficiency.

[0004] Therefore, there is an urgent need for an insulator clamp replacement device that is easy to install and remove, can replace insulator clamps in any position, and can ensure operational safety. Summary of the Invention

[0005] The purpose of this invention is to provide a closed clamp device and method for replacing single insulators, thereby solving the aforementioned problems in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a closed-type clamping device for replacing a single insulator, comprising a first clamp, a second clamp, a tightening assembly, and an extension joint. The first clamp and the second clamp are respectively engaged and positioned on the insulator string. The first clamp and the second clamp are connected by two sets of the extension joints and the tightening assembly to form a retraction and support structure. The first clamp and / or the second clamp consists of a main clamp and a secondary clamp, connected by a pin, a special-shaped hinged bolt, and a nut. The center of the main clamp is a semi-circular arc and the two sides are symmetrically provided with ear plates. The ear plates are provided with connecting holes for connecting the extension joint or the tightening assembly. The special-shaped hinged bolts are symmetrically assembled on the main clamp. The main clamp and the secondary clamp are connected by the special-shaped hinged bolts, the pin, and the nut, and the combination forms a central hole for accommodating the insulator steel cap. The force-bearing surface of the central hole matches the mating section of the steel cap boss.

[0007] Furthermore, the second clamp is a crossarm end clamp of the tension string. The crossarm end clamp is clamped at the connection between the connecting plate and the cup head plate. The inner cavity of the first clamp is clamped at the force-bearing mating surface of the insulator steel cap to replace a piece of insulator on the side of the crossarm of the tension string. The crossarm end clamp, the first clamp, and the tightening assembly constitute a take-up and release device.

[0008] Furthermore, the first clamp is a conductor end clamp for the tension string. The conductor end clamp is clamped on the traction plate. One end of the insulator string is provided with a traction plate. The conductor end clamp is clamped on the traction plate. The inner cavity of the second clamp is clamped at the force-bearing mating surface of the insulator steel cap to replace a piece of insulator on the side of the tension string conductor. The conductor end clamp, the second clamp, and the tightening assembly constitute a take-up and release device.

[0009] Furthermore, the second clamp is a straight-string conductor end clamp, the middle groove of the conductor end clamp is clamped on the balance plate, and the middle inner cavity of the first clamp is clamped at the force-bearing mating surface of the insulator steel cap, so as to replace a piece of insulator on the side of the straight-string conductor. The conductor end clamp, the first clamp, and the tightening assembly constitute a take-up and release device.

[0010] Furthermore, the first clamp is a clamp for the end of the crossarm of a straight string. One end of the insulator string is provided with a U-shaped hanging plate and a ball-head hanging ring. The middle groove of the crossarm end clamp is engaged with the U-shaped hanging plate and the ball-head hanging ring. The middle internal cavity of the second clamp is engaged with the force-bearing mating surface of the insulator steel cap to replace one insulator at the end of the crossarm of the straight string. The crossarm end clamp, the second clamp, and the tightening assembly constitute a take-up and release device.

[0011] Furthermore, the first clamp and the second clamp have the same structure, and both the first clamp and the second clamp are matched and engaged with the force-bearing surface of the steel cap of the insulator for positioning. The first clamp, the second clamp, and the tightening component constitute a take-up and release device.

[0012] Furthermore, the first clamp and / or the second clamp are composed of a main clamp and a secondary clamp, and are connected by a pin and a special-shaped hinge bolt and nut to form an openable semi-circular arc body, and the internal cavity is completely fitted with the force-bearing mating surface of the insulator steel cap.

[0013] Furthermore, the tightening assembly is a gear-driven tensioning screw, a mechanical ratchet tensioning screw, or a manual hydraulic clamp.

[0014] The present invention also provides a method for replacing a single insulator, using the aforementioned closed clamp device for replacing a single insulator, comprising the following steps: S1. Determine the position of the insulator to be replaced in the insulator string; S2. Based on the location of the insulator to be replaced, select the installation position and type of the first and second clamps: If replacing an insulator at the end of the crossarm of a tension string, clamp the second clamp as the end clamp of the crossarm of the tension string at the connection between the connecting plate and the bowl-shaped hanging plate, determine the installation position of the first clamp on the insulator string, and install the first clamp; If replacing an insulator at the end of the conductor of a tension string, clamp the first clamp as the end clamp of the conductor of the tension string on the traction plate, determine the installation position of the second clamp on the insulator string, and install the second clamp; If replacing an insulator at the end of the conductor of a straight string, clamp the second clamp as the end clamp of the conductor of the straight string on the balance connecting plate, and clamp the inner cavity of the first clamp at the force-bearing mating surface of the insulator cap; If replacing an insulator at the end of the crossarm of a straight string, clamp the first clamp as the end clamp of the crossarm of the straight string on the U-shaped hanging plate and the ball-shaped hanging ring, and clamp the inner cavity of the second clamp at the force-bearing mating surface of the insulator cap; If an insulator is to be replaced at any position in the string, the first and second clamps should be engaged on the steel cap of the insulator and tightened securely. S3. Based on the distance between the first clamp and the second clamp, select whether to use an extension joint and adjust the installation length of the tightening component; S4. Connect and tighten both ends of the tightening component to the first clamp and the second clamp respectively; S5. Operate the tightening component to gradually apply force to the tightening component until the insulator to be replaced is loosened; S6. Remove the insulator to be replaced and install the new insulator.

[0015] Furthermore, the tightening component is a gear-driven tightening screw, a mechanical ratchet tightening screw, or a manual hydraulic clamp. In step S5, the corresponding tool is used to operate the tightening component to gradually tighten the screw.

[0016] Furthermore, during installation, the first clamp and / or the second clamp combine the main clamp and the auxiliary clamp cover by means of a special-shaped hinge bolt, pin and nut to form a central hole that fits against the force-bearing surface of the insulator steel cap.

[0017] Furthermore, in step S5, the tightening of the components continues until the mechanical load on the insulator to be replaced in the insulator string is completely unloaded.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1. The single-piece insulator replacement clamp device of the present invention, through its modular structure, enables rapid positioning and replacement of insulators at any position on the crossarm side, conductor side, and in the middle of the insulator string. It solves the problem that traditional operations require the replacement of the entire string or that specific clamps can only be used for a single position, and significantly improves the versatility of the tool and the flexibility of the operation.

[0019] 2. The single-piece insulator replacement clamp device of the present invention is provided with a first clamp and a second clamp, and the first clamp and / or the second clamp are composed of a main clamp and a secondary clamp and connected by a pin and a special-shaped hinged bolt and nut to form an openable semi-circular arc body. Its internal cavity is completely fitted with the force-bearing mating surface of the insulator steel cap, thereby firmly clamping the insulator steel cap, and realizing the safe replacement of insulators at any position in the middle of tension strings or straight strings.

[0020] 3. The single insulator replacement clamp device of the present invention consists of a tension string crossarm end clamp, a first clamp, and a tightening assembly to form a take-up and release device. The crossarm end clamp is clamped at the connection between the connecting plate and the cup head plate. The inner cavity of the first clamp is clamped at the stress-bearing mating surface of the insulator steel cap and does not interfere with the insulators before and after. Then, the tension string crossarm end insulator can be replaced by using the tightening assembly.

[0021] 4. The single insulator replacement clamp device of the present invention consists of a conductor end clamp, a second clamp, and a tightening assembly to form a take-up and release device. The conductor end clamp is clamped on the traction plate, and the inner cavity of the second clamp is clamped at the force-bearing mating surface of the insulator steel cap without interfering with the insulators before and after. Then, the tightening assembly can be used to replace one insulator at the end of the conductor of the tension string.

[0022] 5. The single insulator replacement clamp device of the present invention consists of a straight conductor end clamp, a first clamp and a tightening component forming a take-up and release device. The middle groove of the conductor end clamp is clamped on the balance connecting plate, and the middle inner cavity of the first clamp is clamped at the force-bearing mating surface of the insulator steel cap, without interfering with the insulators before and after. Then, the tightening component is used to replace one insulator at the end of the straight conductor.

[0023] 6. The single insulator replacement clamp device of the present invention consists of a clamp at the end of the crossarm of the straight string, a second clamp, and a tightening assembly to form a take-up and release device. One end of the insulator string is provided with a U-shaped hanging plate and a ball head hanging ring. The middle groove of the crossarm end clamp is engaged with the U-shaped hanging plate and the ball head hanging ring. The inner cavity of the second clamp is engaged with the force-bearing mating surface of the insulator steel cap and does not interfere with the insulators before and after. Then, the clamping assembly is used to replace one insulator at the end of the crossarm of the straight string.

[0024] 7. The method for replacing single insulator pieces of the present invention adaptively and flexibly selects the type and installation position of the first and second clamps according to the different positions of the insulator to be replaced in the tension string or straight string (crossarm side, conductor side, or any position in the middle). Combined with the use of tightening components and extension joints, a retraction and release bearing structure adaptable to different scenarios is constructed. This method enables rapid positioning and replacement of single insulator pieces at any position in the insulator string, fundamentally solving the problem in traditional operations where clamps have limited functionality and cannot replace insulators at specific positions, significantly improving the versatility and flexibility of the operation. Simultaneously, this method utilizes the precise fit between the closed clamp and the insulator cap's bearing surface to ensure stable load-bearing. By gradually operating the tightening components, the mechanical load on the insulator to be replaced is completely unloaded. Thus, while ensuring operational safety, it simplifies the high-altitude installation and disassembly process, significantly improving the efficiency and reliability of single insulator replacement operations, effectively solving the problems of high labor intensity, high safety risks, and complex replacement processes associated with traditional methods. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the main structure of the closed clamp in the single-piece insulator replacement closed clamp device of Embodiment 1 of the present invention; Figure 3 This is a top view of the closed clamp in the single-piece insulator replacement closed clamp device of Embodiment 1 of the present invention. Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 5 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the balance plate in the closed clamp device for replacing a single insulator according to Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 4 of the present invention; Figure 9 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 5 of the present invention; Figure 10 This is a schematic diagram of the closed clamp device for replacing a single insulator according to Embodiment 5 of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1-First clamp; 11-Main clamp; 12-Ear plate; 13-Secondary clamp cover; 14-Irregular hinge bolt; 15-Nut; 10, 21-Crossarm end clamp; 22-Connecting plate; 23-Bowl head hanging plate; 9, 24-Conductor end clamp; 3-Tightening assembly; 4-Extension joint; 5-Insulator; 51-Traction plate; 6-Balance connecting plate; 7-U-shaped hanging plate; 8-Ball head hanging ring. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Example 1 like Figures 1 to 4 As shown, the closed clamp device for replacing a single insulator in this embodiment 1 includes a first clamp 1, a second clamp, a tightening component 3, and an extension joint 4. The first clamp 1 and the second clamp are respectively clamped and positioned on the insulator string 5. The first clamp 1 and the second clamp are connected by two sets of extension joints 4 and tightening components 3 to form a retraction and release bearing structure. The first clamp 1 and / or the second clamp are composed of a main clamp and a secondary clamp and are connected by a pin, a special-shaped hinge bolt 14, and a nut 15. The center of the main clamp 11 is a semi-circular arc and ear plates 12 are symmetrically arranged on both sides. The ear plates 12 are provided with connecting holes for connecting the extension joint 4 or the tightening component 3. The main clamp 11 is symmetrically equipped with special-shaped hinge bolts 14. The main clamp 11 and the secondary clamp cover 13 are connected by special-shaped hinge bolts 14, pins, and nuts 15. After combination, a central hole for accommodating the steel cap of the insulator 5 is formed. The force-bearing surface of the central hole matches the mating section of the steel cap boss.

[0032] In this embodiment 1, the second clamp is the crossarm end clamp 21 of the tension string. The crossarm end clamp 21 is clamped at the connection between the connecting plate 22 and the cup head hanging plate 23. The inner cavity of the first clamp 1 is clamped at the force-bearing mating surface of the steel cap of the insulator 5, so as to replace one insulator at the end of the crossarm of the tension string. The crossarm end clamp 21, the first clamp 1, and the tightening assembly 3 constitute the take-up and release device.

[0033] Furthermore, the inner surface of the central hole is made of metal or high-strength aluminum alloy.

[0034] The first clamp 1 and / or the second clamp are composed of a main clamp and a secondary clamp, and are connected by a pin, a special-shaped hinge bolt 14, and a nut 15 to form an openable semi-circular arc body, and the internal cavity is completely fitted with the force-bearing mating surface of the steel cap of the insulator 5.

[0035] Preferably, the tightening component 3 is a gear-driven tightening screw, a mechanical ratchet tightening screw, or a manual hydraulic clamp.

[0036] When using the closed-type clamp device for replacing a single insulator in Embodiment 1, such as... Figure 1As shown, firstly, clamp 21 of the crossarm end of the tension string is clamped at the connection between the connecting plate 22 and the cup head hanging plate 23. Determine the installation position of the first clamp 1 on the insulator string and install the first clamp 1. Measure the required screw length according to the site distance. If the screw length is insufficient, install the extension joint 4 to adjust the installation position. Then, connect the extension joint 4 and the tightening assembly 3 to the first clamp 1 and the crossarm end clamp 21 respectively, and tighten the nut 15. Use a ratchet wrench to rotate the tightening assembly 3 to apply force, gradually transferring the force to the first clamp 1 and the crossarm end clamp 21. Continue operating the tightening assembly 3 to gradually tighten until the insulator 5 is relaxed to a detachable state, at which point the insulator on the crossarm side of the tension string can be safely replaced.

[0037] Example 2 like Figure 5 As shown, the difference between the closed clamp device for replacing a single insulator in Embodiment 2 and Embodiment 1 is that the first clamp is a conductor end clamp 24 of the tension string. The conductor end clamp 24 is clamped on the traction plate. One end of the insulator string 5 is provided with a traction plate 51. The conductor end clamp 24 is clamped on the traction plate 51. The inner cavity of the second clamp is clamped at the force-bearing mating surface of the steel cap of the insulator 5 to replace a single insulator on the side of the conductor of the tension string.

[0038] The wire end clamp 24, the second clamp, and the tightening component 3 constitute the take-up and release device.

[0039] When using the closed clamp device for replacing a single insulator in Embodiment 2, such as... Figure 5 As shown, first, the conductor end clamp 24 of the tension string is clamped onto the traction plate 51. The installation position of the second clamp on the insulator string is determined and the second clamp is installed. The required screw length is measured according to the site distance. If the screw length is insufficient, the extension joint 4 is installed to adjust the installation position. Then, the extension joint 4 and the tightening assembly 3 are connected to the second clamp and the conductor end clamp 24 respectively, and the nut 15 is tightened. The tightening assembly 3 is rotated with a ratchet wrench to apply force, and the force is gradually transferred to the second clamp and the conductor end clamp 24. The tightening assembly 3 is continued to tighten gradually until the insulator 5 is relaxed to a detachable state, and the insulator on the conductor side of the tension string can be safely replaced.

[0040] Example 3 like Figure 6 , Figure 7 As shown, the difference between the single-piece insulator replacement closed clamp device in Embodiment 3 and Embodiment 1 is that the second clamp is the conductor end clamp 9 of the straight string. The middle groove of the conductor end clamp 9 is clamped on the balance connecting plate 6, and the middle inner cavity of the first clamp 1 is clamped at the force-bearing mating surface of the steel cap of the insulator 5, so as to replace one insulator at the end of the straight string conductor. The conductor end clamp 9, the first clamp 1 and the tightening component 3 constitute a take-up and release device.

[0041] The closed clamp device for replacing single insulators in Embodiment 3 is similar to the usage process in Embodiment 1, and will not be described in detail here.

[0042] Example 4 like Figure 8 As shown, the difference between the single-piece insulator replacement closed clamp device in Embodiment 4 and Embodiment 1 is that the first clamp is the end clamp 10 of the crossarm of the straight string. One end of the insulator string is provided with a U-shaped hanging plate 7 and a ball head hanging ring 8. The middle groove of the crossarm end clamp 10 is clamped on the U-shaped hanging plate 7 and the ball head hanging ring 8. The middle inner cavity of the second clamp is clamped at the force-bearing mating surface of the steel cap of the insulator 5 to replace one insulator at the end of the crossarm of the straight string. The crossarm end clamp 10, the second clamp and the tightening component 3 constitute the take-up and release device.

[0043] The closed clamp device for replacing single insulators in Embodiment 4 is similar to the usage process in Embodiment 2, and will not be described in detail here.

[0044] Example 5 like Figure 9 , Figure 10 As shown, the difference between the closed clamp device for replacing a single insulator in Embodiment 5 and Embodiment 1 is that the first clamp 1 and the second clamp have the same structure, and both the first clamp 1 and the second clamp are matched and engaged with the force-bearing surface of the steel cap of the insulator 5 for positioning.

[0045] In this embodiment 5, the closed clamp device for replacing single insulators is used by first installing the first clamp 1 and the second clamp on the steel cap of the insulator to be replaced on the tension string or straight string, and tightening them. Then, the extension joint 4 and the tightening assembly 3 are connected to the first clamp 1 and the second clamp, and the nut 15 is tightened. The tightening assembly 3 is rotated with a ratchet wrench to apply force, and the force is gradually transferred to the first clamp 1 and the second clamp. The tightening assembly 3 is continued to tighten gradually until the insulator 5 is relaxed to a detachable state, and the defective insulator on the tension string or straight string can be safely replaced.

[0046] Example 6 The method for replacing a single insulator in this embodiment 6, using the aforementioned closed clamp device for replacing a single insulator, includes the following steps: S1. Determine the position of the insulator to be replaced in the insulator string; S2. Based on the location of the insulator to be replaced, select the installation position and type of the first clamp 1 and the second clamp: If replacing an insulator on the side of the crossarm of the tension string, the second clamp is used as the crossarm end clamp 21 of the tension string and clamped at the connection between the connecting plate 22 and the cup head hanging plate 23. Determine the installation position of the first clamp 1 on the insulator string and install the first clamp 1; If replacing an insulator on the conductor side of the tension string, the first clamp is used as the conductor end clamp 24 of the tension string and clamped on the traction plate 51. Determine the installation position of the second clamp on the insulator string and install the second clamp; If replacing an insulator on the conductor side of the straight string, the second clamp is used as the conductor end clamp 9 of the straight string and clamped on the balance connecting plate 6. The middle inner cavity of the first clamp 1 is clamped at the force-bearing mating surface of the steel cap of the insulator 5. If replacing one insulator at the end of the crossarm of the straight string, the first clamp is used as the end clamp 10 of the crossarm of the straight string and is clamped on the U-shaped hanging plate 7 and the ball head hanging ring 8, and the middle inner cavity of the second clamp is clamped on the force-bearing mating surface of the steel cap of the insulator 5; If replacing an insulator at any position in the string, the first clamp 1 and the second clamp are respectively clamped on the steel cap of the insulator and installed and tightened. S3. Based on the distance between the first clamp and the second clamp, select whether to use the extension connector 4 and adjust the installation length of the tightening component 3; S4. Connect and tighten both ends of the tightening component 3 to the first clamp and the second clamp respectively; S5. Operate the tightening component 3 to gradually apply force to the tightening component 3 until the insulator to be replaced is loosened. S6. Remove the insulator to be replaced and install the new insulator.

[0047] Preferably, the tightening component 3 is a gear-driven tightening screw, a mechanical ratchet tightening screw, or a manual hydraulic clamp. In step S5, the corresponding tool is used to operate the tightening component 3 to gradually tighten it.

[0048] During installation, the first clamp 1 and / or the second clamp combine the main clamp 11 with the auxiliary clamp cover 13 by means of a special-shaped hinge bolt 14, a pin and a nut 15 to form a central hole that fits against the force-bearing surface of the insulator steel cap.

[0049] Furthermore, in step S5, the operation of tightening component 3 continues until the mechanical load on the insulator to be replaced in the insulator string is completely unloaded.

[0050] The method for replacing a single insulator in this embodiment 6 adaptively and flexibly selects the type and installation method of the first clamp 1 and the second clamp according to the different positions of the insulator to be replaced in the tension string or straight string (crossarm side, conductor side, or any position in the middle). Combined with the tightening component 3 and the extension joint 4, it realizes the rapid and safe replacement of insulators at any position in the insulator string. At the same time, the method uses the precise fit between the closed clamp and the stress surface of the insulator steel cap to ensure stable load bearing. By gradually tightening, the mechanical load of the insulator to be replaced is completely unloaded, thereby simplifying the operation process, significantly improving the work efficiency and safety, and effectively solving the problem of difficult replacement caused by the single function of the clamp and the complexity of installation and disassembly in the traditional operation method.

[0051] This invention, through its modular structural design, enables rapid and safe replacement of insulators at any position on the crossarm side, conductor side, or in the middle of tension or straight insulator strings, significantly improving the versatility and operational flexibility of the tool. The first and / or second clamps adopt a main and auxiliary clamp openable structure, connected by pins and special-shaped hinge bolts. Their internal cavities precisely fit the force-bearing surface of the steel cap, firmly clamping the insulator at any position in the middle. For the end positions, the crossarm end clamp or conductor end clamp can be combined with closed clamps and tightening components to form a take-up and release device, efficiently completing the replacement of end insulators without interference, effectively solving the problems of traditional operations requiring replacement of the entire string or the limited functionality of clamps.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A closed clamping device for replacing a single insulator, characterized in that, The device includes a first clamp, a second clamp, a tightening assembly, and an extension joint. The first clamp and the second clamp are respectively engaged and positioned on the insulator string. The first clamp and the second clamp are connected by two sets of the extension joints and the tightening assembly to form a retraction and support structure. The first clamp and / or the second clamp consists of a main clamp and a secondary clamp, connected by a pin, a special-shaped hinged bolt, and a nut. The center of the main clamp is a semi-circular arc and ear plates are symmetrically arranged on both sides. The ear plates have connecting holes for connecting the extension joint or the tightening assembly. The special-shaped hinged bolts are symmetrically assembled on the main clamp. The main clamp and the secondary clamp are connected by the special-shaped hinged bolts, the pin, and the nut, and the combination forms a central hole for accommodating the insulator steel cap. The force-bearing surface of the central hole matches the mating section of the steel cap boss.

2. The closed-type clamp device for replacing a single insulator according to claim 1, characterized in that, The second clamp is a crossarm end clamp of the tension string. The crossarm end clamp is clamped at the connection between the connecting plate and the cup head plate. The inner cavity of the first clamp is clamped at the force-bearing mating surface of the insulator steel cap to replace one insulator at the side end of the crossarm of the tension string. The crossarm end clamp, the first clamp, and the tightening assembly constitute a take-up and release device.

3. The closed-type clamp device for replacing a single insulator according to claim 1, characterized in that, The first clamp is a conductor end clamp for the tension string. The conductor end clamp is clamped on the traction plate. One end of the insulator string is provided with a traction plate. The conductor end clamp is clamped on the traction plate. The inner cavity of the second clamp is clamped at the force-bearing mating surface of the insulator steel cap to replace a piece of insulator on the side of the tension string conductor. The conductor end clamp, the second clamp, and the tightening assembly constitute a take-up and release device.

4. The closed clamp device for replacing a single insulator according to claim 1, characterized in that, The second clamp is a straight conductor end clamp. The middle groove of the conductor end clamp is clamped on the balance plate. The middle inner cavity of the first clamp is clamped at the force-bearing mating surface of the insulator steel cap to replace a piece of insulator at the side end of the straight conductor. The conductor end clamp, the first clamp, and the tightening assembly constitute a take-up and release device.

5. A closed clamp device for replacing a single insulator according to claim 1, characterized in that, The first clamp is a clamp at the end of the crossarm of a straight string. One end of the insulator string is provided with a U-shaped hanging plate and a ball-head hanging ring. The middle groove of the crossarm end clamp is engaged with the U-shaped hanging plate and the ball-head hanging ring. The middle inner cavity of the second clamp is engaged with the force-bearing mating surface of the insulator steel cap to replace one insulator at the end of the crossarm of the straight string. The crossarm end clamp, the second clamp, and the tightening assembly constitute a take-up and release device.

6. The closed clamp device for replacing a single insulator according to claim 1, characterized in that, The first clamp and the second clamp have the same structure, and both the first clamp and the second clamp are matched and engaged with the force-bearing surface of the steel cap of the insulator. The first clamp, the second clamp and the tightening component constitute a take-up and release device.

7. The closed clamp device for replacing a single insulator according to claim 1, characterized in that, The first clamp and / or the second clamp are composed of a main clamp and a secondary clamp, and are connected by a pin and a special-shaped hinge bolt and nut to form an openable semi-circular arc body, and the internal cavity is completely fitted with the force-bearing mating surface of the insulator steel cap.

8. A closed clamp device for replacing a single insulator according to any one of claims 1-7, characterized in that, The tightening assembly is a gear-driven tensioning screw, a mechanical ratchet tensioning screw, or a manual hydraulic clamp.

9. A method for replacing a single insulator, characterized in that, The closed clamp device for replacing a single insulator according to any one of claims 1-8 includes the following steps: S1. Determine the position of the insulator to be replaced in the insulator string; S2. Based on the location of the insulator to be replaced, select the installation position and type of the first and second clamps: If replacing an insulator at the end of the crossarm of a tension string, clamp the second clamp as the end clamp of the crossarm of the tension string at the connection between the connecting plate and the bowl-shaped hanging plate, determine the installation position of the first clamp on the insulator string, and install the first clamp; If replacing an insulator at the end of the conductor of a tension string, clamp the first clamp as the end clamp of the conductor of the tension string on the traction plate, determine the installation position of the second clamp on the insulator string, and install the second clamp; If replacing an insulator at the end of the conductor of a straight string, clamp the second clamp as the end clamp of the conductor of the straight string on the balance connecting plate, and clamp the inner cavity of the first clamp at the force-bearing mating surface of the insulator cap; If replacing an insulator at the end of the crossarm of a straight string, clamp the first clamp as the end clamp of the crossarm of the straight string on the U-shaped hanging plate and the ball-shaped hanging ring, and clamp the inner cavity of the second clamp at the force-bearing mating surface of the insulator cap; If an insulator is to be replaced at any position in the string, the first and second clamps should be engaged on the steel cap of the insulator and tightened securely. S3. Based on the distance between the first clamp and the second clamp, select whether to use an extension joint and adjust the installation length of the tightening component; S4. Connect and tighten both ends of the tightening component to the first clamp and the second clamp respectively; S5. Operate the tightening component to gradually apply force to the tightening component until the insulator to be replaced is loosened; S6. Remove the insulator to be replaced and install the new insulator.

10. The method for replacing a single insulator according to claim 9, characterized in that, The tightening assembly is a gear-driven tightening screw, a mechanical ratchet tightening screw, or a manual hydraulic clamp. In step S5, the corresponding tool is used to operate the tightening assembly to gradually tighten the screw.

11. The method for replacing a single insulator according to claim 9, characterized in that, During installation, the first clamp and / or the second clamp combine the main clamp and the auxiliary clamp cover by means of special-shaped hinge bolts, pins and nuts to form a central hole that fits against the force-bearing surface of the insulator steel cap.

12. The method for replacing a single insulator according to claim 9, characterized in that, In step S5, the tightening of the components continues until the mechanical load on the insulator to be replaced in the insulator string is completely unloaded.

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