Tension string insulator and insulator replacement method

Abstract

This invention discloses a tensioning device for double-string tension insulators in transmission lines and a method for replacing the insulators. The device includes a force-applying component and two sets of fixing components. Each set of fixing components includes a connecting bracket, a first fixing member, and a second fixing member. The first fixing member is located at the fulcrum end of the connecting bracket and is connected to an intact insulator string as a fulcrum. The second fixing member is located between the fulcrum end and the force-applying end and is connected to the insulator string to be repaired. The force-applying component connects the two force-applying ends. The method includes: installing the second fixing members on both the front and rear sides of the string containing the insulator to be replaced, installing the first fixing member at the corresponding position on the intact string, and driving the two force-applying ends to move closer together after connecting the force-applying components, thereby reducing the tension in the section of the insulator string between the two second fixing members for replacement. This invention utilizes the principle of unilateral lever relaxation, requiring only the overcoming of local tension, significantly reducing the required operating force and device weight, and improving the safety and efficiency of high-altitude operations.

Description

Technical Field

[0001] This invention relates to tools and methods for maintaining power transmission lines, and more specifically, to a tensioning device for double-string tension insulators used in power transmission lines and a method for replacing insulators. Background Technology

[0002] During the operation and maintenance of transmission lines, tension insulator strings need to be replaced promptly when damaged due to lightning strikes, pollution, aging, or other reasons. Tension double-string insulators consist of two parallel insulator strings that bear the enormous tension of the conductor. Traditionally, replacing a single damaged insulator in one string requires first releasing the tension in the section containing that insulator.

[0003] Currently, Chinese patent document CN116093809A discloses a "Hydraulic Transmission Line Tension Double-String Insulator Replacement Device and Method". This device forms a chain-type tensioning mechanism by connecting pipes, hydraulic tensioning boosters, and other components in series. Its two ends are respectively connected to the tensioning plates shared by the two strings of insulators. During operation, the entire chain mechanism needs to be tensioned, thereby simultaneously bringing the distance between the two end plates of the two strings of insulators closer, causing the two strings of insulators to relax as a whole, and then the damaged insulator can be replaced.

[0004] However, such existing technical solutions have the following significant drawbacks: The required operating force is enormous, and the equipment is bulky: because it is necessary to overcome the overall tension of two strings of insulators simultaneously to pull the connecting plates at both ends, the required tensioning force is extremely large. This inevitably leads to an increase in the specifications, weight, and size of the hydraulic tensioner, making it inconvenient to carry to high-altitude work positions and requiring strenuous operation.

[0005] The operation is complex and inefficient: the entire device needs to be connected and pre-tightened with the tensioning plates at both ends of the line, making the installation process cumbersome. Furthermore, during the tensioning process, multiple additional load-bearing components are required to support the loosened insulator strings to prevent them from sagging, which further increases the number of work steps and the workload for personnel.

[0006] The design lacks specificity and involves redundant operations: it was originally intended for replacing an entire string of insulators or for situations requiring simultaneous relaxation of two strings. However, when only one insulator in a string needs to be replaced, this solution also relaxes the other intact insulator string, which is an unnecessary operation and increases the risk of the intact insulator string accidentally falling, requiring additional manpower for support or propping. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tensioning device and insulator replacement method for double-string tension insulators in transmission lines, which can replace a single damaged insulator in a single string of double-string insulators in a targeted, efficient and labor-saving manner.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A tensioning device for double-string insulators for transmission lines, wherein the double-string insulator for transmission lines includes two parallel first insulator strings and second insulator strings, and the device includes a force-applying component and two sets of fixing components, each set of fixing components including a connecting bracket, a first fixing member and a second fixing member; The connecting bracket has a fulcrum end and a force-applying end; The first fixing member is disposed at the fulcrum end of the connecting bracket and is used to connect with the insulator on the first insulator string; The second fixing member is disposed on the connecting bracket and located between the fulcrum end and the force-applying end, and is used to connect with the insulator on the second insulator string; The force-applying component is connected to the force-applying end of the connecting bracket of the two sets of fixing components, and is used to drive the two force-applying ends to move closer or further apart, so as to reduce or restore the tension of the second insulator string between the two second fixing members.

[0009] In the above-mentioned tensioning device for double-string insulators for transmission lines, the force-applying component includes a connecting plate and a hydraulic component. One end of the hydraulic component is connected to the force-applying end of one of the connecting brackets, the other end of the hydraulic component is connected to one end of the connecting plate, and the other end of the connecting plate is connected to the force-applying end of the other connecting bracket.

[0010] In the aforementioned tensioning device for double-string insulators used in transmission lines, a tension sensor is installed on the hydraulic assembly.

[0011] In the above-mentioned tensioning device for double-string insulators in transmission lines, the first fixing member includes an upper clamping block and a lower hook. The upper clamping block is fixed to the force-applying end, and the lower hook is hook-shaped and has a lower clamping block. One side of the lower hook has an upwardly extending threaded section, which passes through the corresponding through hole on the connecting bracket and is locked with a nut so that the upper clamping block and the lower clamping block together hold the ball cap of the insulator. The second fixing member has the same structure as the first fixing member.

[0012] In the above-mentioned tensioning device for double-string insulators in transmission lines, a positioning pin is provided on the connecting bracket at the corresponding position of the second fixing member. The positioning pin extends into the slot where the insulator ball cap connects to the previous insulator section.

[0013] In the above-mentioned tensioning device for double-string insulators in transmission lines, the fulcrum end of the connecting bracket is provided with multiple mounting holes for installing the first fixing member. By installing the first fixing member in different mounting holes, the relative position between the first fixing member and the second fixing member can be adjusted to adapt to different widths between the two insulator strings.

[0014] In the above-mentioned tensioning device for double-string insulators for transmission lines, a connecting rod is also provided between the connecting brackets of the two sets of fixing components. The two ends of the connecting rod are slidably inserted into the corresponding connecting brackets. Fasteners are provided at the ends of the connecting rods that pass through the corresponding connecting brackets to limit the distance between the two connecting brackets.

[0015] A method for replacing insulators using any of the above schemes is also disclosed, the method comprising the following steps: S1: The insulator to be replaced is located on the second insulator string. Along the length of the second insulator string, an installation point is determined on each side of the insulator to be replaced, and the second fixing parts of the two sets of fixing components are connected to the insulators at these two installation points respectively. S2: Taking the connection point of each second fixing member as a reference, determine the corresponding position on the first insulator string, and connect the first fixing members of the two sets of fixing components to the insulators at these two corresponding positions respectively; S3: Connect the force-applying component to the force-applying end of the connecting bracket of the two sets of fixed components; S4: Operate the force application component to bring the force application ends of the two connecting brackets closer together, thereby reducing the tension of the insulator string located between the two second fixing parts on the second insulator string, so as to replace the damaged insulator; S5: After replacement, operate the force application component to move the force application ends of the two connecting brackets away from each other and restore tension; S6: Disassemble the device.

[0016] In the above insulator replacement method, in step S1, both installation points are at least one insulator away from the insulator to be replaced.

[0017] In the above insulator replacement method, the force-applying component is a hydraulic component. In steps S4 and S5, the force-applying end is brought closer or moved away by driving the hydraulic component to extend and retract. The tension is monitored in real time by a tension sensor installed on the hydraulic component to control the applied tension and prevent over-traction.

[0018] Compared with the prior art, the advantages of the present invention are: Two sets of fixing components can be independently installed at two different locations on the insulator string. The force-applying component acts as a central power source, controlling the movement of both components to achieve precise control of specific sections of the insulator string. Each fixing component includes a connecting bracket, a first fixing element, and a second fixing element, integrating three main functions: support, fulcrum fixing, and force-bearing fixing. This allows for modular installation and use, improving operational flexibility and adaptability. The force-applying component, as the sole power source, acts simultaneously on the force-applying ends of both fixing components, ensuring synchronized and symmetrical movement on both sides.

[0019] By using the first fixing member on the intact string as the fulcrum and the second fixing member on the string to be repaired as the resistance point, and by driving the force-applying end to move closer through the force-applying component, these three together form a complete lever system that acts on a single-sided insulator string, precisely relaxing the target section. It completely abandons the cumbersome traditional approach of "overall tensioning of two series plates" and cleverly transforms the huge load of "overall tension of two strings" that needs to be overcome into "local tension of a single string" that only needs to be overcome. Furthermore, the lever principle can further save effort.

[0020] The first fixing member is anchored to the intact tension string, and the second fixing member only acts on the faulty string. This combination forms a natural safety isolation for the operation. Throughout the operation, the intact first insulator string always maintains its original tension state without any loosening, support or intervention. This completely avoids the risk of the intact string falling off or overturning due to overall loosening in traditional methods. The operation target is strictly limited to the fault point, and the safety boundary is clear.

[0021] Because the forces that need to be overcome are significantly reduced, the power and size of the force-applying components can be drastically reduced. At the same time, the two sets of fixing components are structurally symmetrical and functionally independent, requiring no connection to heavy-duty line hardware. This results in a significant reduction in the weight, size, and complexity of the entire device, achieving true lightweighting and portability, making it particularly suitable for efficient single- or double-person operations in harsh high-altitude environments. The installation process has also been simplified from the traditional "assembly of a large tensioning mechanism" to "modular clamping and fixing," greatly improving ease of operation.

[0022] Furthermore, the force-applying component includes a connecting plate and a hydraulic component. One end of the hydraulic component is connected to the force-applying end of one of the connecting brackets, and the other end of the hydraulic component is connected to one end of the connecting plate. The other end of the connecting plate is connected to the force-applying end of another connecting bracket. As a power source, the hydraulic component provides continuous, stable, and precisely controllable linear driving force, which is less strenuous to operate and provides more stable output compared to traditional screw-type mechanical methods. The connecting plate, as an independent rigid connecting component, provides a dedicated and reliable structural foundation for the installation of the hydraulic component and the transmission of force, making the function of the force-applying component modular. Through the connecting plate acting as a rigid bridge, the unidirectional, controllable thrust generated by the hydraulic component is transformed, without loss or lag, into precise, stable, and completely synchronized opposing or receding linear motions at the two force-applying ends.

[0023] Furthermore, a tension sensor is installed on the hydraulic assembly. The combination of the tension sensor and the hydraulic assembly allows the operator to accurately know the applied tension value during pressurization. This fundamentally eliminates the risk of over-tension that is easily caused by relying on feeling or experience to judge tightness in traditional operations. When the tension approaches the safety threshold, the operator can immediately stop pressurization, achieving precise and safe control of the conductor tension.

[0024] Furthermore, the first fixing component includes an upper clamping block and a lower hook. The upper clamping block is fixed to the force-applying end, and the lower hook is hook-shaped and has a lower clamping block. One side of the lower hook has an upwardly extending threaded section, which passes through a corresponding through hole on the connecting bracket and is locked with a nut, so that the upper and lower clamping blocks together clamp the ball cap of the insulator. The second fixing component has the same structure as the first fixing component. Traditional clamps are often designed for specific models in pursuit of reliability, resulting in poor versatility. However, this solution, through the adjustable lower hook design, allows one set of fixing components to cover all insulator models within a certain size range without the need to replace parts.

[0025] Furthermore, a positioning pin is provided on the connecting bracket at the corresponding position of the second fixing member. The positioning pin extends into the slot connecting the insulator ball cap and the previous insulator section. At the position of the second fixing member, the device needs to transmit the main force to loosen the insulator string, and the force is greatest here. The design of the positioning pin allows some of the axial force, especially the force to prevent slippage, to be directly transmitted through the pin-slot shear structure, rather than being entirely converted into the clamping force of the clamping block on the glass or ceramic part of the ball cap. This effectively reduces the risk of crush damage to the insulator body and extends its service life.

[0026] Furthermore, the fulcrum end of the connecting bracket is provided with multiple mounting holes for installing the first fixing member. By installing the first fixing member in different mounting holes, the relative position between the first fixing member and the second fixing member can be adjusted, thereby adapting to different widths between two insulator strings. Before or after climbing the tower, operators can quickly visually or simply measure the distance between the strings, select the corresponding hole position for installation, and quickly complete the width adaptation. The entire process does not require carrying or replacing any additional adaptation parts or modules, greatly improving on-site work efficiency.

[0027] Furthermore, a connecting rod is provided between the connecting brackets of the two sets of fixing components. The two ends of the connecting rod are slidably inserted into the corresponding connecting brackets. Fasteners are provided at the ends of the connecting rods passing through the corresponding connecting brackets to limit the distance between the two connecting brackets. By adding a connecting rod with both sliding and limiting functions between the two connecting brackets, the contradiction between "operational freedom" and "installation stability" in traditional operations is creatively resolved. While ensuring that the core tightening and loosening operation is not affected in any way, the risk of accidental disintegration or excessive opening of the device during pre-installation, tension release, or disassembly is effectively prevented.

[0028] The insulator replacement method first identifies the insulator to be replaced and anchors it directly at two key points before and after its location on the insulator string. This ensures that all subsequent operating forces are precisely applied to the specific section containing the damaged insulator, rather than the entire string, eliminating interference with non-target areas from a procedural standpoint. Secondly, based on the position of the already installed second fixing member, the installation position of the first fixing member as the fulcrum on the intact string is determined in reverse. This ensures an optimal lever relationship between the fulcrum and the force-bearing point, maximizing the supporting effect of the intact string and ensuring the mechanical efficiency of the lever system. This method avoids the positional mismatch or poor force distribution problems that might arise from fixing the intact string first. The entire process, from determining the installation point to applying force and restoring tension, is logically smooth, greatly reducing hesitation and misjudgment during operation.

[0029] Furthermore, in step S1, both installation points are spaced at least one insulator away from the insulator to be replaced. This constraint ensures that a buffer distance of at least one insulator is maintained on each side of the damaged insulator. This allows operators to install and remove insulators in an open, unobstructed area after slackening the target section, without interfering with adjacent fixtures or insulators, greatly improving the convenience and smoothness of the operation.

[0030] Furthermore, the force-applying component is a hydraulic component. In steps S4 and S5, the force-applying end is brought closer or further away by driving the hydraulic component to extend or retract. A tension sensor mounted on the hydraulic component monitors the tension in real time to control the applied tension and prevent over-traction. The hydraulic component provides powerful, stable, and precisely controllable force, ensuring the efficiency and smoothness of the operation process itself. The tension sensor, by displaying the tension value in real time, makes the requirement to control the tension quantifiable and executable. The combination of these two components allows the operator to actively stop when approaching a safety threshold or precisely return to the target value when restoring tension, fundamentally eliminating over-traction accidents caused by uncontrolled force. This not only greatly improves the inherent safety of the operation but also makes the tightness level more standardized and reproducible, reducing human error. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a single insulator; Figure 2 This is a schematic diagram of the structure of the tensioning device for double-string insulators in transmission lines of the present invention during use; Figure 3 This is a schematic diagram of the force-applying component in this invention; Figure 4 This is a schematic diagram of the connection structure between the fixing component and the insulator before installation in this invention; Figure 5 This is a schematic diagram of the connection structure between the fixing component and the insulator after installation in this invention; Figure 6 This is a schematic diagram of the structure of the device of the present invention after it is installed on an insulator string; Figure 7 This is a cross-sectional view of the second fastener of the present invention when it is installed on the insulator; Figure 8 This is a schematic diagram of the structure of the first fixing member of the present invention installed on the insulator.

[0032] The attached figures are labeled as follows: 110. First insulator string; 120. Second insulator string; 130. Insulator; 131. Insulator body; 132. Ball cap; 1321. Slot; 133. Ball head; 200. Force application component; 210. Connecting plate; 220. Hydraulic component; 230. Tension sensor; 300. Fixing component; 310. Connecting bracket; 311. Pivot end; 312. Force application end; 313. Mounting hole; 320. First fixing component; 321. Upper clamping block; 322. Lower hook; 3221. Threaded section; 323. Lower clamping block; 324. Nut; 325. Locating pin; 326. Connecting rod; 327. Fastener; 330. Second fixing component. Detailed Implementation

[0033] A tensioning device for double-string insulators for transmission lines, wherein the double-string insulators for transmission lines include two parallel first insulator strings 110 and second insulator strings 120. The device includes a force-applying component 200 and two sets of fixing components 300. Each set of fixing components 300 includes a connecting bracket 310, a first fixing member 320 and a second fixing member 330. The connecting bracket 310 has a fulcrum end 311 and a force-applying end 312; The first fixing member 320 is disposed at the fulcrum end 311 of the connecting bracket 310 and is used to connect with the insulator 130 on the first insulator string 110; The second fixing member 330 is disposed on the connecting bracket 310 and located between the fulcrum end 311 and the force application end 312, and is used to connect with the insulator 130 on the second insulator string 120; The force-applying component 200 is connected to the force-applying end 312 of the connecting bracket 310 of the two sets of fixing components 300, and is used to drive the two force-applying ends 312 to move closer or further apart, so as to reduce or restore the tension of the second insulator string 120 between the two second fixing members 330.

[0034] Two sets of fixing components 300 can be independently installed at two different positions on the insulator string. The force-applying component 200 acts as a central power source to control the movement of both components, enabling precise control of specific sections of the insulator string. Each fixing component 300 includes a connecting bracket 310, a first fixing element 320, and a second fixing element 330, integrating three major functions: support, fulcrum fixing, and force-bearing fixing. This allows for modular installation and use of the device, improving operational flexibility and adaptability. The force-applying component 200, as the sole power source, acts simultaneously on the force-applying ends 312 of both fixing components 300, ensuring synchronous and symmetrical movement on both sides.

[0035] By using the first fixing member 320 on the intact string as the fulcrum end 311 and the second fixing member 330 on the string to be repaired as the resistance point, and by driving the force-applying end 312 to move closer through the force-applying component 200, these three together constitute a complete lever system acting on a single-sided insulator string, precisely relaxing the target section. It completely abandons the cumbersome traditional approach of "overall tensioning of two series plates" and cleverly transforms the huge load of "overall tension of two strings" that needs to be overcome into "local tension of a single string" that only needs to be overcome. Furthermore, the lever principle can further save effort.

[0036] The first fixing member 320 is anchored to the intact tension string, and the second fixing member 330 only acts on the faulty string, forming a natural safety isolation for operation. Throughout the operation, the intact first insulator string 110 always maintains its original tension state without any loosening, support or intervention. This completely avoids the risk of the intact string falling off or overturning due to overall loosening in traditional methods. The operation target is strictly limited to the fault point, and the safety boundary is clear.

[0037] Because the force to be overcome is significantly reduced, the power and size of the force-applying component 200 can be drastically reduced. Meanwhile, the two sets of fixing components 300 are structurally symmetrical and functionally independent, requiring no connection to heavy-duty line fittings. This results in a significant reduction in the weight, size, and complexity of the entire device, achieving true lightweighting and portability, making it particularly suitable for efficient single- or double-person operations in harsh high-altitude environments. The installation process has also been simplified from the traditional "assembly of a large tensioning mechanism" to "modular clamping and fixing," greatly improving ease of operation.

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0040] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] like Figure 1 , Figure 2As shown, the tension double-string insulator for transmission lines includes two parallel first insulator strings 110 and second insulator strings 120. Each insulator string has a basically consistent length and includes multiple insulators 130 connected in series. Each insulator 130 includes an insulator body 131, a ball cap 132 disposed on one side of the insulator body 131 along the length direction of the insulator string, and a ball head 133 disposed on the other side of the insulator body 131. A slot 1321 for the ball head 133 to be attached is opened on the ball cap 132. By attaching the ball head 133 of the previous insulator 130 to the slot 1321 of the next insulator 130, the insulators 130 are connected into a string. The tensioning device for the double-string tension insulators in this embodiment is mainly used to replace a damaged insulator 130 in one of the insulator strings. First, the tension on the damaged insulator 130 needs to be released so that it can disengage from the insulators 130 before and after it, and then a healthy insulator 130 can be installed in its place. For ease of explanation, the insulator string whose damaged insulator 130 needs to be replaced is defined as the second insulator string 120, and the other insulator string is defined as the first insulator string 110.

[0043] See Figures 1 to 8 This invention relates to an embodiment of a tensioning device for double-string insulators in transmission lines. The device includes a force-applying component 200 and two sets of fixing components 300. The fixing components 300 are disposed on the insulators 130 before and after the damaged insulator 130. The force-applying component 200 is used to move the insulators 130 before and after the damaged insulator 130 toward the damaged insulator 130, thereby reducing the tension on the damaged insulator 130 and allowing the damaged insulator 130 to disengage from the intact insulators 130 before and after it.

[0044] Each set of fixing components 300 includes a connecting bracket 310, a first fixing member 320, and a second fixing member 330. The connecting bracket 310 has a fulcrum end 311 and a force-applying end 312. In this embodiment, the connecting bracket 310 is rod-shaped or plate-shaped. The first fixing member 320 is disposed at the fulcrum end 311 of the connecting bracket 310 and is used to connect with the insulator 130 on the first insulator string 110. In fact, the first insulator string 110 connected to the first fixing member 320 is an intact insulator string, thus using an intact insulator string as the fulcrum. By setting the first fixing member 320 at the fulcrum end 311 and connecting it to the intact insulator string, the entire force-applying process uses the insulator 130 of an insulator string that is always in a taut and stable state as the absolute fulcrum. This avoids the problem in traditional methods where the fulcrum itself is also moving or needs to be fixed, fundamentally ensuring the stability and controllability of the force-applying process.

[0045] The second fixing member 330 is disposed on the connecting bracket 310 and located between the fulcrum end 311 and the force-applying end 312. It is used to connect with the insulator 130 on the second insulator string 120. By placing the second fixing member 330 between the fulcrum end 311 and the force-applying end 312, it becomes a resistance point on the lever. This design achieves dual optimization: first, it precisely locks the force target onto the second insulator string 120 where the insulator 130 needs to be replaced, regardless of whether the string is intact; second, by selecting the specific installation position on the connecting bracket 310, the distance between the resistance point and the resistance arm of the fulcrum can be adjusted, thereby optimizing the force-saving effect according to the actual working conditions.

[0046] The force-applying component 200 is connected to the force-applying end 312 of the connecting bracket 310 of the two sets of fixing components 300. It is used to drive the two force-applying ends 312 to move closer or further apart, thereby reducing or restoring the tension of the second insulator string 120 between the two second fixing members 330. The force-applying component 200 acts as the sole power source, simultaneously acting on the force-applying ends 312 of the two fixing components 300, ensuring synchronous and symmetrical action on both sides. In other words, the main design concept of this device is to use the insulators 130 on a good insulator string as a fulcrum, utilizing the lever principle to loosen a certain number of insulators 130 before and after the damaged insulator 130, thus facilitating the replacement of the damaged insulator 130. Compared to traditional replacement devices, this device utilizes the lever principle and has a longer power arm for the force application component 200 than the resistance arm for the second fixing component 330. This reduces the power requirement for the force application component 200. Furthermore, since only a portion of the insulator string containing the faulty insulator 130 needs to be loosened, the required power for the force application component 200 is further reduced. As a result, the overall power requirement for the force application component 200 is significantly lower than that of existing devices. Because less power is required, the size and weight of the force application component 200 are also reduced, leading to comprehensive and significant improvements in labor-saving, safety, portability, and operational efficiency.

[0047] Furthermore, the force-applying component 200 in this embodiment includes a connecting plate 210 and a hydraulic component 220. The connecting plate 210 is mainly used to compensate for the distance difference between the hydraulic component 220 and the force-applying ends 312 of the two connecting brackets 310, thus playing a connecting role. The hydraulic component 220 is used as a power source, providing a continuous, stable, and precisely controllable linear driving force. Compared with traditional screw and other mechanical methods, it is easier to operate and has a more stable output.

[0048] like Figure 2 , Figure 3 , Figure 6As shown, specifically, one end of the hydraulic component 220 is connected to the force-applying end 312 of one of the connecting brackets 310, and the other end of the hydraulic component 220 is connected to one end of the connecting plate 210. The other end of the connecting plate 210 is connected to the force-applying end 312 of another connecting bracket 310. This force-applying component 200 makes the entire tightening and releasing process completely hydraulically controlled. The operator only needs to operate a light manual pump or electric switch to smoothly apply or release huge tension, completely eliminating the heavy and dangerous operation method that requires multiple people to rotate the screw. The force is applied evenly and smoothly, greatly reducing the risk of impact caused by sudden force application or asynchrony.

[0049] Furthermore, the hydraulic assembly 220 is equipped with a tension sensor 230. The combination of the tension sensor 230 and the hydraulic assembly 220 allows the operator to accurately know the applied tension value during pressurization. This fundamentally eliminates the risk of over-traction that is easily caused by relying on feeling or experience to judge the tightness in traditional operations. When the tension approaches the safety threshold, the operator can immediately stop pressurization, achieving precise and safe control of the conductor tension. The real-time data provided by the sensor allows the process of loosening the insulator 130 to be carried out in stages and according to plan. The operator can precisely control the degree of loosening based on the readings, ensuring that the damaged insulator 130 is successfully removed while maintaining the original tension state of the line to the maximum extent, avoiding unnecessary additional stress on adjacent insulators 130 and fittings.

[0050] As for the structure of the fasteners, such as Figure 8 As shown, the identical structure of the first fixing member 320 and the second fixing member 330 significantly reduces the number of parts and lowers manufacturing, inventory, and maintenance costs. The first fixing member 320 is described below as an example. It includes an upper clamping block 321 and a lower hook 322. The upper clamping block 321 is fixed to the force-applying end 312, keeping its position constant and serving as a "static reference" for the entire clamping action, ensuring that the position of the upper clamping point remains fixed during clamping and force application. The lower hook 322 is hook-shaped, and a lower clamping block 323 is provided at the hook of the lower hook 322. The hook-shaped structure allows it to naturally hook onto and conform to the bottom contour of the insulator 130 ball cap 132, providing preliminary self-positioning and centering functions. The lower clamping block 323 provides an increased contact surface that matches the lower surface of the ball cap 132, significantly increasing friction and preventing slippage.

[0051] One side of the lower hook 322 has an upwardly extending threaded section 3221. The threaded section 3221 passes through a corresponding through hole on the connecting bracket 310 and is locked by a nut 324, so that the upper clamping block 321 and the lower clamping block 323 together clamp the ball cap 132 of the insulator 130. Traditional clamps are often designed for specific models in pursuit of reliability, resulting in poor versatility. However, this solution, through the design of the adjustable lower hook 322, allows one set of fasteners to cover all insulator 130 models within a certain size range without the need to replace parts. Furthermore, both ends of the lower hook 322 can extend upwards, and two corresponding through holes can be opened on the connecting bracket 310, so that both ends of the lower hook 322 are locked by nuts 324 after passing through the corresponding through holes. This makes the force on the lower hook 322 more balanced, and the lower hook 322 is less likely to swing or deflect. The upper clamping block 321 and the lower clamping block 323 can be made of rubber or similar materials that can produce a certain elastic deformation. When the insulator string is squeezed, the insulator string will deflect to a certain extent relative to the upper clamping block 321 and the lower clamping block 323. However, since the displacement caused by releasing the insulator string is relatively small, the plastic deformation of the material can cope with the above situation. Of course, it can also be designed so that the upper clamping block 321 can deflect relative to the connecting bracket 310, and the lower clamping block 323 or the lower hook 322 can deflect relative to the connecting bracket 310 to counteract the deflection relative to the insulator string.

[0052] like Figure 7 As shown, based on the aforementioned fasteners, a positioning pin 325 is provided on the connecting bracket 310 at the corresponding position of the second fastener 330. The positioning pin 325 penetrates into the ball cap 132 of the insulator 130 and the slot 1321 connecting the insulator 130. Since the aforementioned fastener structure relies on the combined action of the upper clamping block 321 and the lower clamping block 323 to generate radial clamping force and anti-detachment force, it resists the tendency of the fastener to detach from the ball cap 132 due to leverage. Relying solely on the friction of the clamping blocks carries the potential risk of slippage due to surface contamination, lubrication, or insufficient pressure. The positioning pin 325, as a rigid protruding component, has the core function of providing precise axial positioning and preventing circumferential rotation. The addition of the positioning pin 325 upgrades the fastening method from pure friction fastening to friction + form-fit fastening. The mechanical engagement with the slot 1321 provides a deterministic, friction-independent stopping capability, fundamentally changing the reliability of the fastening. If necessary, a positioning pin 325 can also be installed at the position of the connecting bracket 310 corresponding to the first fixing member 320. There can be a certain gap between the positioning pin 325 and the slot 1321 to allow the connecting bracket 310 to shift relative to the insulator 130 during operation.

[0053] Based on the above embodiments, the fulcrum end 311 of the connecting bracket 310 is provided with multiple mounting holes 313 for mounting the first fixing member 320. All mounting holes 313 are arranged along the line connecting the first fixing member 320 and the second fixing member 330. By installing the first fixing member 320 in the mounting holes 313 at different positions, the relative position between the first fixing member 320 and the second fixing member 330 can be adjusted to accommodate different widths between the two insulator strings. For example, if the upper clamping block 321 is fixed to the connecting bracket 310 with bolts, the mounting holes 313 include threaded holes that mate with the bolts. That is, multiple threaded holes are opened at different positions on the fulcrum end 311 of the connecting bracket 310 to facilitate the adjustment of the position of the upper clamping block 321. Correspondingly, the fulcrum end 311 of the connecting bracket 310 is also provided with multiple through holes to facilitate the lower hook 322 to pass through. Before or after climbing the tower, operators can quickly visually or simply measure the distance between the strings, select the corresponding hole positions for installation, and quickly complete the width adaptation. The entire process does not require carrying or replacing any additional adapter parts or modules, which greatly improves on-site work efficiency.

[0054] like Figure 2 As shown, a connecting rod 326 is also provided between the connecting brackets 310 of the two sets of fixing components 300. The connecting rod 326 is located between the two sets of insulator strings and is arranged parallel to the two sets of insulator strings. The two ends of the connecting rod 326 can slide through the corresponding connecting brackets 310. For example, an elliptical through hole is opened on the connecting bracket 310 for the end of the connecting rod 326 to pass through. In this way, when the connecting bracket 310 deflects relative to the connecting rod 326, there will be no interference between the connecting rod 326 and the connecting bracket 310. The end of the connecting rod 326 that passes through the corresponding connecting bracket 310 is provided with a fastener 327 to limit the distance between the two connecting brackets 310. The diameter of the fastener 327 is larger than the diameter of the through hole. When the two connecting brackets 310 are separated to a certain extent, the maximum distance between the two connecting brackets 310 is limited by the connecting rod 326 and the fastener 327. By adding a connecting rod 326 with both sliding and limiting functions between the two connecting brackets 310, the contradiction between "operational freedom" and "installation stability" in traditional operations is creatively resolved. Under the premise of ensuring that the core tightening and loosening operation is not affected in any way, the risk of accidental disintegration or excessive opening of the device during pre-installation, tension release, or disassembly is effectively prevented.

[0055] This embodiment also discloses a method for replacing insulators in a transmission line tension double-string insulator loosening and tightening device using any of the above-mentioned schemes, including the following steps: S1: The insulator 130 to be replaced is located on the second insulator string 120. Along the length extension direction of the second insulator string 120, an installation point is determined on both sides of the insulator 130 to be replaced, and the second fixing member 330 of the two sets of fixing components 300 is connected to the insulator 130 at the two installation points respectively. S2: Taking the connection point of each second fixing member 330 as a reference, determine the corresponding position on the first insulator string 110, and connect the first fixing member 320 of the two sets of fixing components 300 to the insulators 130 at the two corresponding positions respectively. S3: Connect the force-applying component 200 to the force-applying end 312 of the connecting bracket 310 of the two sets of fixing components 300; S4: Operate the force application component 200 to bring the force application ends 312 of the two connecting brackets 310 closer together, thereby reducing the tension of the insulator string 120 located between the two second fixing members 330, so as to replace the damaged insulator 130. S5: After the replacement is completed, operate the force application component 200 to move the force application ends 312 of the two connecting brackets 310 away from each other and restore the tension; S6: Disassemble the device.

[0056] The above method first clearly identifies the target of the operation as the insulator 130 to be replaced, and anchors it directly at two key points before and after its insulator string. This ensures that all subsequent operating forces are precisely applied to the specific section containing the damaged insulator 130, rather than the entire string, thus eliminating interference with non-target areas from a procedural perspective. Secondly, based on the position of the already installed second fixing member 330, the installation position of the first fixing member 320 as the fulcrum on the intact string is determined in reverse. This ensures an optimal lever relationship between the fulcrum and the force-bearing point, maximizing the supporting effect of the intact string and ensuring the mechanical efficiency of the lever system from a methodological perspective. This avoids the positional mismatch or poor force distribution problems that might arise from fixing the intact string first. The entire process, from determining the installation point to applying force and restoring tension, is logically smooth, greatly reducing hesitation and misjudgment during operation.

[0057] Furthermore, in step S1, both installation points are spaced at least one insulator 130 away from the insulator 130 to be replaced. Specifically, one installation point is located at least one insulator 130 away in front of the insulator 130 to be replaced, and the other installation point is located at least one insulator 130 away behind the insulator 130 to be replaced. This constraint ensures that a buffer distance of at least one insulator 130 is maintained on each side of the damaged insulator 130. This allows operators to install and remove the insulator 130 in an open, unobstructed area after relaxing the target section, without interfering with adjacent fasteners or insulators 130, greatly improving the convenience and smoothness of the operation.

[0058] Furthermore, in steps S4 and S5, the force-applying end 312 is brought closer or further away by driving the hydraulic assembly 220 to extend or retract. A tension sensor 230 mounted on the hydraulic assembly 220 monitors the tension in real time to control the applied tension and prevent over-traction. The hydraulic assembly 220 provides powerful, stable, and precisely controllable force, ensuring the efficiency and smoothness of the operation. The tension sensor 230, by displaying the tension value in real time, makes the requirement to control the tension quantifiable and executable. The combination of these two features allows the operator to actively stop when approaching a safety threshold or precisely return to the target value when restoring tension, fundamentally eliminating over-traction accidents caused by uncontrolled force. This not only greatly improves the inherent safety of the operation but also makes the tension level more standardized and reproducible, reducing human error.

[0059] This solution creatively employs the principle of unilateral lever relaxation, designing a device and supporting method comprising a force-applying component 200 and two sets of fixing components 300. Utilizing intact insulator strings as stable fulcrums, simply driving the force-applying component 200 to bring the two force-applying ends 312 together allows for precise and labor-saving relaxation of the local section containing the insulator 130 to be replaced. This overcomes the problems of cumbersome equipment and laborious operation caused by the need to simultaneously tension two strings of insulators 130 in traditional techniques. The device, through the design of adjustable fixing components and positioning pins 325, achieves wide adaptability to insulators 130 of different sizes and string spacings. Furthermore, the combination of hydraulic drive and tension sensor 230 ensures a smooth and controllable operation process with visible tension, effectively preventing over-traction. The overall solution boasts significant advantages such as lightweight portability, safe operation, strong versatility, and high operational efficiency.

[0060] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A tensioning device for a double-string tension insulator for a transmission line, wherein the double-string tension insulator for a transmission line comprises two parallel first insulator strings and a second insulator string, characterized in that, The device includes a force-applying component and two sets of fixing components. Each set of fixing components includes a connecting bracket, a first fixing member, and a second fixing member. The connecting bracket has a fulcrum end and a force-applying end; The first fixing member is disposed at the fulcrum end of the connecting bracket and is used to connect with the insulator on the first insulator string; The second fixing member is disposed on the connecting bracket and located between the fulcrum end and the force-applying end, and is used to connect with the insulator on the second insulator string; The force-applying component is connected to the force-applying end of the connecting bracket of the two sets of fixing components, and is used to drive the two force-applying ends to move closer or further apart, so as to reduce or restore the tension of the second insulator string between the two second fixing members.

2. The tensioning device for double-string tension insulators in transmission lines according to claim 1, characterized in that, The force-applying component includes a connecting plate and a hydraulic component. One end of the hydraulic component is connected to the force-applying end of one of the connecting brackets, and the other end of the hydraulic component is connected to one end of the connecting plate. The other end of the connecting plate is connected to the force-applying end of the other connecting bracket.

3. The tensioning device for double-string tension insulators in transmission lines according to claim 2, characterized in that, The hydraulic component is equipped with a tension sensor.

4. The tensioning device for double-string tension insulators in transmission lines according to claim 1, characterized in that, The first fixing member includes an upper clamping block and a lower hook. The upper clamping block is fixed to the force-applying end. The lower hook is hook-shaped and has a lower clamping block. One side of the lower hook has an upwardly extending threaded section. The threaded section passes through the corresponding through hole on the connecting bracket and is locked with a nut so that the upper clamping block and the lower clamping block together hold the ball cap of the insulator. The second fixing member has the same structure as the first fixing member.

5. The tensioning device for double-string tension insulators in transmission lines according to claim 4, characterized in that, The connecting bracket at the corresponding position of the second fixing member is provided with a positioning pin, which extends into the slot connecting the insulator ball cap and the previous insulator section.

6. The tensioning device for double-string tension insulators in transmission lines according to claim 1, characterized in that, The connecting bracket has multiple mounting holes at its fulcrum end for installing the first fixing member. By installing the first fixing member in different mounting holes, the relative position between the first fixing member and the second fixing member can be adjusted to accommodate different widths between the two insulator strings.

7. The tensioning device for double-string tension insulators in transmission lines according to claim 1, characterized in that, A connecting rod is also provided between the connecting brackets of the two sets of fixing components. The two ends of the connecting rod are slidably inserted into the corresponding connecting brackets. Fasteners are provided at the ends of the connecting rods that pass through the corresponding connecting brackets to limit the distance between the two connecting brackets.

8. A method for replacing insulators using the tensioning device for double-string tension insulators in transmission lines as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: The insulator to be replaced is located on the second insulator string. Along the length of the second insulator string, an installation point is determined on each side of the insulator to be replaced, and the second fixing parts of the two sets of fixing components are connected to the insulators at these two installation points respectively. S2: Taking the connection point of each second fixing member as a reference, determine the corresponding position on the first insulator string, and connect the first fixing members of the two sets of fixing components to the insulators at these two corresponding positions respectively; S3: Connect the force-applying component to the force-applying end of the connecting bracket of the two sets of fixed components; S4: Operate the force application component to bring the force application ends of the two connecting brackets closer together, thereby reducing the tension of the insulator string located between the two second fixing parts on the second insulator string, so as to replace the damaged insulator; S5: After replacement, operate the force application component to move the force application ends of the two connecting brackets away from each other and restore tension; S6: Disassemble the device.

9. The insulator replacement method according to claim 8, characterized in that, In step S1, both installation points are spaced at least one insulator away from the insulator to be replaced.

10. The insulator replacement method according to claim 8, characterized in that, The force-applying component is a hydraulic component. In steps S4 and S5, the force-applying end is brought closer or moved away by driving the hydraulic component to extend and retract. The tension is monitored in real time by a tension sensor installed on the hydraulic component to control the applied tension and prevent over-traction.

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