Universal fixture and operation method for live replacement of tension double insulator string

Abstract

The present invention relates to a universal fixture and operation method for live replacement of a tension double insulator string, the universal fixture comprises a tension screw, an adjustable insulating rod, and tension front and rear clamps, the tension front and rear clamps are arranged oppositely on the cross arm side and the conductor side, a plurality of connecting plate holes are arranged at different positions on the tension front and rear clamps to connect triangular connecting plates of different models, the tension screw comprises a screw and a nut seat, the tension rear clamp is provided with a detachable hollow module, a bearing is arranged inside the nut seat, the upper end of the screw passes through the hollow module and then is installed with a nut seat with a built-in bearing, the lower end of the screw is connected to the upper end of the adjustable insulating rod, the outer side of the nut seat is connected to a metal rocker to drive it to move forward and backward along the screw, and the lower end of the adjustable insulating rod is connected to the tension front clamp. The universal fixture and operation method are conducive to convenient, efficient and safe live replacement of tension double insulator strings.

Description

Technical Field

[0001] This invention belongs to the field of power operation tools and equipment, specifically relating to a universal clamp and operation method for live replacement of tension double insulator strings. Background Art

[0002] In recent years, with the continuous increase in transmission lines, and the fact that many of these lines are located in mountainous areas and areas prone to lightning strikes, the insulators used are mostly glass and porcelain insulators, resulting in relatively high lightning strike and spontaneous breakage rates. This necessitates frequent live-line replacement of tension double-strand insulator strings. However, due to inadequate manufacturing processes and construction quality control, many non-standard hardware fittings are installed on the lines, leading to a variety of different models of matching triangular coupling plates. Currently, most tension clamps specifically designed for live-line work have limited applicability; for example, they are only suitable for tension strings designed with standard sizes such as L-1640, L-2040, and L-3050 coupling plates. Some tension double-strand insulator strings cannot be replaced live-line, or existing tension clamps can only be used for trial operations. This results in high physical exertion for workers, low work efficiency, and high operational risks, thus affecting the live-line operation rate and reliability of transmission equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a universal clamp and operating method for live replacement of tension double insulator strings. This universal clamp and operating method facilitates convenient, efficient, and safe live replacement of tension double insulator strings.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a universal clamp for live replacement of tension double insulator strings, comprising a tension screw rod, an adjustable insulating rod, and tension front and rear clamps. The tension front and rear clamps are arranged opposite each other on the crossarm side and the conductor side. Several connecting plate holes are provided at different positions on the tension front and rear clamps to connect triangular connecting plates of different models. The tension screw rod includes a screw rod and a nut seat. The tension rear clamp is provided with a detachable hollow module. A bearing is provided inside the nut seat. The upper end of the screw rod passes through the hollow module and is installed with the nut seat containing the built-in bearing. The lower end of the screw rod is connected to the upper end of the adjustable insulating rod. The outer side of the nut seat is connected to a metal rocker arm to drive it to move back and forth along the screw rod. The lower end of the adjustable insulating rod is connected to the tension front clamp.

[0005] Furthermore, the front and rear strain clamps respectively include a clamp body and a built-in adjustment module. The clamp body is used to connect one side of the triangular link plate and has a "C" - shaped structure with a middle cavity. The built-in adjustment module is arranged in the middle cavity. The built-in adjustment module includes a fixed module and a movable module. The fixed module is fixedly connected to the clamp body. The fixed module is provided with a first serrated connection part and has a first through - hole. A corresponding second serrated connection part is provided on the movable module. A long screw rod is provided on the second serrated connection part. The long screw rod passes through the first through - hole and extends out from the top of the clamp body. By adjusting the left - right position of the long screw rod in the first through - hole, the movable module and the inclined plane of the triangular link plate inserted into the middle cavity reach the best degree of fit. Then, the long screw rod extending out from the top of the clamp body is fixed by a nut to fix the movable module and the fixed module.

[0006] Furthermore, a number of connecting plate holes are correspondingly opened on both side plates of the "C" - shaped structure, and a connecting hole on the plate is provided on the triangular link plate. When the triangular link plate is inserted into the middle cavity, the two side plates of the "C" - shaped structure and the triangular link plate are fixedly connected by fasteners passing through the connecting plate holes and the connecting hole on the plate.

[0007] Furthermore, the cross - section of the first through - hole on the fixed module is in the shape of a long runway, so that when adjusting the position of the movable module, the long screw rod on the sliding module can make left - right position adjustments in the first through - hole, thereby adjusting the relative position of the movable module and the fixed module.

[0008] Furthermore, the clamp body adopts a bent - plate clamp structure.

[0009] Furthermore, the general clamp is also equipped with an insulating bottle support. One end of the insulating bottle support is provided with a tripod. The top of the tripod is a long screw rod with a thread, which is fixed by a nut after passing through the through - hole on the rear strain clamp. The lower part of the tripod is a hollow metal sleeve, and the hollow metal sleeve is sleeved on the solid metal rod connected to the insulating bottle support. The tripod can move left - right along the length direction of the solid metal rod.

[0010] Furthermore, a number of equally - spaced positioning holes are provided along the length direction on the rear section of the adjustable insulating pull rod. A connecting rod hole corresponding to it is provided on the front strain clamp. When the insulating pull rod is adjusted to the required length, the length adjustment and positioning of the insulating pull rod are realized by a screw rod passing through the corresponding positioning hole and the connecting rod hole and being fixed by a nut.

[0011] The present invention also provides an operation method for replacing a strain double - insulator string while the line is energized, including the following steps:

[0012] 1) Ground - potential operators and equal - potential operators climb the tower and move to both sides of the double - insulator string;

[0013] 2) The workers on both sides select different connecting plate holes according to the model of the triangular connecting plate and the line spacing, and use threaded fasteners to fix the tension front and rear clamps to the triangular connecting plates on both sides of the double insulator string.

[0014] 3) Adjust the built-in adjustment modules in the front and rear tension clamps to achieve the best fit with the corresponding triangular connecting plate inclined surface, and fix them with threaded fasteners;

[0015] 4) The workers on both sides work together to assemble the insulating bottle support frame and adjust the position of the tripod of the insulating bottle support frame to ensure that the insulating bottle support frame is always directly below the insulator string to be replaced;

[0016] 5) Ground potential workers tighten the tension rods to loosen the insulator strings, thereby enabling equipotential energized replacement of tension double insulator strings.

[0017] Compared to existing technologies, this invention offers the following advantages: The structural design of the tension clamps (front and rear) allows it to be adapted to different models of triangular connecting plates. Simultaneously, the built-in adjustment module regulates the fit with the triangular connecting plate, increasing the force-bearing area between the clamp and the plate. During operation, the force-bearing point on the inclined surface of the triangular connecting plate is located on the sliding module, preventing damage to the clamp body and ensuring more stable and reliable force application. The clamp's use is no longer limited by the model of the triangular connecting plate. This solves the problem of some transmission lines' tension double-strand insulator strings being unable to be replaced under energized conditions or requiring multiple sets of dedicated tension clamps for trial operations with low safety factors. It improves the convenience and efficiency of under-energized replacement of tension double-strand insulator strings. Therefore, this invention has strong practicality and broad application prospects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a general-purpose clamp according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the fixture body in an embodiment of the present invention.

[0020] Figure 3 This is a structural schematic diagram of the fixed module in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the sliding module in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the connection state between the clamp body and the built-in adjustment module in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the bottle holder "tripod" in an embodiment of the present invention.

[0024] Figure 7It is a schematic diagram of the simulated on-site working state of the universal fixture in the embodiment of the present invention.

[0025] In the figure, 1 - tension insulator rod, 2 - rear tension clamp, 3 - front tension clamp, 4 - adjustable insulating pull rod, 5 - insulating insulator support, 6 - built-in adjustment module, 7 - "tripod" of insulator support, 71 - threaded long screw rod, 72 - hollow metal sleeve, 73 - solid metal rod, 8 - triangular link plate, 9 - double insulator string. Specific embodiments

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] The present invention provides a universal fixture for live replacement of double-tension insulator strings, as Figure 1-7 shown, including a reinforced anti-torsion tension insulator rod 1, an adjustable insulating pull rod 4, a universal front tension clamp 3 and a universal rear tension clamp 2. The front and rear tension clamps are oppositely arranged on the cross-arm side and the conductor side. A number of connecting plate holes are provided at different positions on the front and rear tension clamps to connect triangular link plates 8 of different models. The tension insulator rod 1 includes a screw rod and a nut seat. The rear tension clamp 2 is provided with a detachable hollow manganese steel block. A bearing is arranged inside the nut seat. The upper end of the screw rod passes through the hollow manganese steel block and then installs a nut seat with an internal bearing. The lower end of the screw rod is connected to the upper end of the adjustable insulating pull rod 4. The outer side of the nut seat is connected to a metal rocker to drive it to move back and forth along the screw rod. The lower end of the adjustable insulating pull rod 4 is connected to the front tension clamp 3.

[0028] In this embodiment, the connection side of the front and rear tension clamps with the triangular link plate is a double-hole structure, that is, two connecting plate holes are provided thereon, and the distance between the two holes is 100 mm, respectively for triangular link plates with a wire distance of 400 mm and 500 mm. The front tension clamp is provided with a remotely operable small ring and a small hole for installing a mirror, which can not only realize the operation in the ground potential mode but also perform the operation in the equal potential. The tension insulator rod adopts a single-trip design, which satisfies the free retraction and extension of the screw rod, and the stroke margin and strength meet the requirements of the operation of live replacement of double-tension insulator strings.

[0029] The front and rear tension clamps respectively include a clamp body and a built-in adjustment module 6. Figure 5 The connection state between the clamp body and the built-in adjustment module is shown. As Figure 2 shown, the clamp body adopts a bent plate clamp structure design, canceling the traditional large knife clamp design, effectively avoiding deformation and脱出 during the assembly and stress process of the large knife front clamp. The side of the clamp body for connecting the triangular link plate is a "匚" - shaped structure with a middle cavity. The built-in adjustment module 6 is arranged in the middle cavity. The built-in adjustment module 6 includes a fixed module and a movable module. The fixed module is fixedly connected to the clamp body. As Figure 3As shown, the fixed module is provided with a first serrated connecting portion and a first through hole is opened. As Figure 4 shown, a second serrated connecting portion is correspondingly provided on the movable module. A long screw rod is provided on the second serrated connecting portion. The long screw rod passes through the first through hole and extends out from the top of the clamp body. By adjusting the left and right positions of the long screw rod in the first through hole, the best fit degree between the movable module and the inclined surface of the triangular connecting plate inserted into the middle cavity is achieved. Then, the long screw rod extending out from the top of the clamp body is fixed by a butterfly nut to fix the movable module and the fixed module. At this time, the force application point of the inclined surface of the triangular connecting plate in the working state is located on the sliding module, avoiding damage to the clamp body.

[0030] Among them, a number of connecting plate holes are correspondingly opened on both side plates of the "C"-shaped structure. A connecting hole on the plate is provided on the triangular connecting plate. When the triangular connecting plate is inserted into the middle cavity, the two side plates of the "C"-shaped structure and the triangular connecting plate are fixedly connected by a fastener passing through the connecting plate hole and the connecting hole on the plate. The cross-section of the first through hole on the fixed module is a long runway shape, so that when adjusting the position of the movable module, the long screw rod on the sliding module can make left and right position adjustments in the first through hole, thereby adjusting the relative position between the movable module and the fixed module, and then being fixed to the top end of the clamp body by a nut.

[0031] In this embodiment, the front and rear strain clamps are made of high-strength TC4 titanium alloy material to meet the strength requirements of the clamp when stressed. The adjustable range of the built-in adjustment module reaches 0 - 7 cm.

[0032] The general clamp is also equipped with an insulating bottle support. One end of the insulating bottle support is provided with a "tripod" 7. The top end of the "tripod" 7 is a long screw rod 71 with threads, which passes through the through hole on the rear strain clamp and is fixed by a nut. The lower part of the "tripod" is a hollow metal sleeve 72. The hollow metal sleeve 72 is sleeved on a solid metal rod 73 connected to the insulating bottle support. The "tripod" can move left and right along the length direction of the solid metal rod. The bottle support is designed with a special-shaped insulating tube and adopts a large-diameter structure, which plays a role in horizontally bearing the self-weight of any type of insulator string to be replaced. And the bending degree of the middle part of the bottle support is small, minimizing the tightening stroke of the wire rod to the greatest extent. As Figure 6 shown, the "tripod" connecting the bottle support and the rear clamp can move left and right along the length direction of the solid metal rod, ensuring that the bottle support is always directly below the insulator string to be replaced during the operation, effectively ensuring that the force on the bottle support is in an equilibrium state, and avoiding the risk of the insulator string falling off due to the tipping of the bottle support after the insulator string becomes slack.

[0033] The adjustable insulating rod 4 has several equidistant positioning holes along its length at the rear end, and the tension front clip has corresponding connecting rod holes. When the insulating rod is adjusted to the required length, the rod is fixed by passing through the corresponding positioning holes and connecting rod holes with a screw and a nut, thereby realizing the length adjustment and positioning of the insulating rod.

[0034] In this embodiment, the adjustable insulating pull rod has a multi-hole design and uses moisture-proof filling tube material. It has high mechanical strength (#32, 20 tons), tensile strength, torsion resistance and adjustable length, and its insulation performance is sufficient to meet the requirements of live-line work.

[0035] This invention also provides a method for replacing tension double insulator strings under energized conditions, comprising the following steps:

[0036] 1) Ground potential workers and equipotential workers climb the tower and move to both sides of the double insulator string 9;

[0037] 2) The workers on both sides select different connecting plate holes according to the model of the triangular connecting plate and the line spacing, and use screws and nuts to fix the tension front clamp 3, tension rear clamp 2 and the triangular connecting plates 8 on both sides of the double insulator string 9.

[0038] 3) Adjust the built-in adjustment module 6 in the tension front and rear clamps to achieve the best fit with the corresponding triangular connecting plate 8 inclined surface, and fix it with butterfly nuts;

[0039] 4) The workers on both sides work together to assemble the insulating bottle support frame 5 and adjust the position of the "tripod" 7 of the insulating bottle support frame to ensure that the insulating bottle support frame is always directly below the insulator string to be replaced.

[0040] 5) The ground potential operator tightens the tension rod 1 to loosen the insulator string, thereby achieving equipotential energized replacement of the tension double insulator string.

[0041] The above are preferred embodiments of the present invention. Any changes made to the technical solution of the present invention that do not exceed the scope of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A universal fixture for live replacement of a double-stranded tension insulator string, characterized in that: It includes a strain screw rod, an adjustable insulating pull rod, and front and rear strain clamps. The front and rear strain clamps are oppositely arranged on the cross-arm side and the conductor side. A number of connecting plate holes are provided at different positions on the front and rear strain clamps to connect triangular link plates of different models. The strain screw rod includes a screw rod and a nut seat. The rear strain clamp is provided with a detachable hollow module. A bearing is arranged inside the nut seat. The upper end of the screw rod passes through the hollow module and then installs the nut seat with an internal bearing. The lower end of the screw rod is connected to the upper end of the adjustable insulating pull rod. The outer side of the nut seat is connected to a metal rocker to drive it to move back and forth along the screw rod. The lower end of the adjustable insulating pull rod is connected to the front strain clamp; The front and rear strain clamps respectively include a clamp body and an internal adjustment module. One side of the clamp body for connecting the triangular link plate is a "C"-shaped structure with a middle cavity. The internal adjustment module is arranged in the middle cavity. The internal adjustment module includes a fixed module and a movable module. The fixed module is fixedly connected to the clamp body. The fixed module is provided with a first serrated connection part and a first through hole is opened. A corresponding second serrated connection part is provided on the movable module. A long screw rod is arranged on the second serrated connection part. The long screw rod passes through the first through hole and extends out from the top of the clamp body. By adjusting the left and right positions of the long screw rod in the first through hole, the best fit degree between the movable module and the inclined surface of the triangular link plate inserted into the middle cavity is achieved. Then, the long screw rod extending out from the top of the clamp body is fixed by a nut to fix the movable module and the fixed module; A number of connecting plate holes are correspondingly opened on both side plates of the "C"-shaped structure. The triangular link plate is provided with connecting holes on the plate. When the triangular link plate is inserted into the middle cavity, the two side plates of the "C"-shaped structure and the triangular link plate are fixedly connected by fasteners passing through the connecting plate holes and the connecting holes on the plate; The cross-section of the first through hole on the fixed module is a long runway shape, so that when adjusting the position of the movable module, the long screw rod on the sliding module can make left and right position adjustments in the first through hole, thereby adjusting the relative position between the movable module and the fixed module; The clamp body adopts a bent plate clamp structure; The universal clamp is also equipped with an insulating bottle support. One end of the insulating bottle support is provided with a tripod. The top of the tripod is a long screw rod with threads to be fixed by a nut after passing through the through hole on the rear strain clamp. The lower part of the tripod is a hollow metal sleeve. The hollow metal sleeve is sleeved on the solid metal rod connected to the insulating bottle support. The tripod can move left and right along the length direction of the solid metal rod; A number of equally spaced positioning holes are provided along the length direction of the rear section of the adjustable insulating pull rod. A connecting rod hole corresponding to it is provided on the front strain clamp. When the insulating pull rod is adjusted to the required length, the length adjustment and positioning of the insulating pull rod are realized by a screw rod passing through the corresponding positioning hole and connecting rod hole and fixing with a nut.

2. The method for operating a universal fixture for live replacement of a tension double insulator string according to claim 1 is characterized in that: It includes the following steps: 1) The ground potential operator and the equal potential operator climb the tower and move to both sides of the double insulator string; 2) The operators on both sides select different connecting plate holes according to the triangular connecting plate model and line spacing, and use threaded fasteners to fix the front and rear tension clamps with the triangular connecting plates on both sides of the double insulator string; 3) Adjust the built-in adjustment modules in the front and rear tension clamps to achieve the best fit with the corresponding triangular connecting plate slopes, and fix them with threaded fasteners; 4) The operators on both sides cooperate to assemble the insulating bottle support rack and adjust the tripod position of the insulating bottle support rack to ensure that the insulating bottle support rack is always directly below the insulator string to be replaced; 5) The ground potential operator tightens the tension screw to relax the insulator string, thereby achieving equal potential live replacement of the tension double insulator string.

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