Tool set for live replacement of 220kV line hanging string insulator

Abstract

The invention relates to the technical field of power equipment maintenance, in particular to a tool set for live replacement of a 220kV line suspension string insulator. The tool comprises an angle iron clamp, a lifting platform, an insulating plate, a wire clamp and an inclined support assembly. The angle iron clamping assembly is fixed on the cross arm angle iron; a motor of the lifting platform drives a lifting screw rod through gear transmission and is connected with an insulating plate to adjust the height; the insulating plate is segmented and provided with adjusting holes, and is connected with the wire clamp and the inclined support assembly through the commutator. The wire clamp comprises an insulating layer, the length of the inclined supporting assembly can be adjusted by rotating the lead screw, and the lifting lead screw is locked by a ratchet wheel and a pawl. The tool can replace the insulator with electricity, avoids grounding faults, adapts to various scenes, is convenient to operate, can accurately adjust the operation position, improves the replacement efficiency and reliability, reduces the number of times of power failure, and guarantees the stability of power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment maintenance, and particularly relates to a complete set of tools for live replacement of 220kV line hanging string insulators. BACKGROUND

[0002] Insulators are an important component of power transmission lines, and the reasons for replacing insulators include lightning strikes, external forces, aging to the service life, etc. In order to ensure the reduction of line outage times and improve power supply reliability, insulators need to be replaced live. In 220kV power transmission line live work, replacing insulators is a frequently carried out operation item, but when replacing the hanging string insulators of the strain tower current lead, it can only be carried out under the condition of line outage, and if live work is carried out, due to the gravity and angle of the insulator of the current lead, ground fault is prone to occur. Therefore, a tool needs to be developed, which can safely replace the insulator under the condition of ensuring the insulation distance of the current lead and the tower. SUMMARY

[0003] In order to make up for the above shortcomings, the present application provides a complete set of tools for live replacement of 220kV line hanging string insulators, which aims to solve the problem that the insulator is prone to ground fault due to the gravity and angle of the current lead.

[0004] In order to achieve the above-mentioned target, the technical scheme adopted by the present application is as follows: The utility model provides a kind of live replacement 220kV line string insulator complete tool, including angle iron clamp, the inside mounting of the angle iron clamp has clamping component, the clamping component is used to be firmly fixed in the overall tool on the support structure of 220kV line cross arm angle iron etc., ensure that tool does not shift during operation;The bottom end side of the angle iron clamp is fixedly connected with lifting platform, lifting platform provides installation and support base for subsequent lifting relevant components;Motor is installed on the lifting platform, motor is used as power source, provides driving force for lifting action;The output end of the motor is fixedly connected with driving gear, motor drives driving gear synchronous rotation when operating;Lifting gear is rotatably connected with driven gear meshing with driving gear on the lifting platform, driving gear rotates and drives driven gear to rotate by gear meshing effect;Lifting screw is screw-connected on the inner wall of the driven gear, and the lifting screw is screw-connected with the lifting platform, when driven gear rotates, due to the transmission effect of screw, the lifting screw can realize vertical lifting movement along the lifting platform;Insulating plate is rotatably connected at the bottom end of the lifting screw, and the insulating plate plays the role of insulation isolation, prevents current conduction through tool to cause safety accident, and it can adjust position along with the lifting of the lifting screw;Two reversers are installed at the bottom end of the insulating plate, and the reverser is used to change the transmission direction and connection angle of force to adapt to different operation scene requirements;The insulating plate is connected with wire clamp and inclined support assembly respectively by reverser, wire clamp is used to clamp and fix drain wire, and inclined support assembly is used to assist support and stabilize the whole tool and drain wire, to ensure that structure is stable during operation.

[0005] The clamping component includes a limiting strip fixedly connected to the top end of the angle iron clamp, which serves as a guide and limiting function to ensure the correct direction of the clamping plate during movement. A threaded bolt is screw-connected to the side surface of the angle iron clamp, which can move axially on the angle iron clamp by rotation. A clamping plate is rotatably connected to the end of the threaded bolt, which moves synchronously with the threaded bolt. The clamping plate is used to clamp and fix the cross arm angle iron in cooperation with the angle iron clamp. A groove is formed at the top end of the clamping plate to slide with the limiting strip, which further ensures the stability and accuracy of the clamping plate movement. A spring is installed between the side of the clamping plate rotatably connected to the threaded bolt and the angle iron clamp.

[0006] The fixed plate is fixedly connected to the lifting platform, provides a mounting support base for the ratchet wheel and the pawl, and ensures the fixed position; one end of the fixed plate is fixedly connected with the angle iron clamp, further enhancing the connection stability of the fixed plate and the overall structure of the tool; two fixed shafts are fixedly connected to one side of the fixed plate, the fixed shafts are used for mounting the ratchet wheel and the pawl, and ensure that they can stably rotate; the ratchet wheel is rotatably connected to one of the fixed shafts, and the ratchet wheel can freely rotate around the fixed shaft; the pawl is rotatably connected to the other fixed shaft, the pawl can rotate around the fixed shaft, and the pawl is in meshing engagement with the ratchet teeth of the ratchet wheel, so that the one-way locking function is realized through the meshing engagement of the pawl and the ratchet wheel; the ratchet wheel is in meshing engagement with the lifting lead screw, and the lifting lead screw can drive the ratchet wheel to rotate when moving up and down, and under the locking action of the pawl, the lifting lead screw can be prevented from moving in the reverse direction.

[0007] The insulating plate is divided into two sections, and the segmented design facilitates adjustment of the overall length of the insulating plate according to actual operation requirements; a plurality of adjusting holes are formed in each section of the insulating plate, the adjusting holes are uniformly distributed, and a plurality of optional connecting positions are provided for length adjustment of the insulating plate; the two sections of the insulating plate are connected through adjusting bolts matched with the adjusting holes, the adjusting bolts pass through the corresponding adjusting holes in the two sections of the insulating plate, and then are fastened through nuts to realize fixed connection of the two sections of the insulating plate, and by selecting adjusting holes at different positions for connection, the overlapping length of the two sections of the insulating plate can be changed, so that the overall length of the insulating plate can be adjusted.

[0008] The reversing device comprises an upper connecting plate and a lower connecting plate, a connecting shaft is rotatably connected between the upper connecting plate and the lower connecting plate, the connecting shaft provides support and shafting for relative rotation of the upper connecting plate and the lower connecting plate, so that the upper connecting plate and the lower connecting plate can freely rotate around the connecting shaft, thereby realizing change of the connection angle; lug ears are fixedly connected to the upper connecting plate and the lower connecting plate, connecting holes are formed in the lug ears, and the lug ears are used for connection with connecting columns or other components, the lug ears are connected with the upper connecting plate and the lower connecting plate by welding or integral molding process, and the connection strength is ensured.

[0009] The wire clamp comprises a left sleeve and a right sleeve, both of which adopt a half-circular tubular structure, and the two sleeves cooperate to form a complete tubular structure for wrapping the drainage wire; the left sleeve and the right sleeve are rotationally connected with a hinge shaft, the hinge shaft enables the left sleeve and the right sleeve to rotate therearound, realizing the opening and closing of the wire clamp and facilitating the insertion and removal of the drainage wire; the inner walls of the left sleeve and the right sleeve are fixedly connected with an insulation layer, the insulation layer is made of high-strength insulating material, and its thickness is designed according to the insulation requirement of the 220kV line, for preventing the direct contact of the drainage wire with the metal part of the wire clamp and avoiding the conduction of electric current to cause a safety accident; the top ends of the left sleeve and the right sleeve are fixedly connected with a lug, the lug and the wire clamp body are connected by welding or one-piece forming process, ensuring the connection strength; the lug is connected with another commutator at the bottom end of the insulation plate, and the angle adjustment and connection between the wire clamp and the insulation plate are realized through the commutator.

[0010] The inclined support assembly comprises an outer cylinder, which is a hollow tubular structure and serves as an outer support structure of the inclined support assembly; the inner top end of the outer cylinder is rotationally connected with a rotating screw rod, which can freely rotate in the outer cylinder about its own axis; the top end of the rotating screw rod extends out of the outer cylinder and is fixedly connected with a rotating block, which is a polygonal structure, facilitating the rotation by using a wrench or the like, and the rotating block can drive the rotating screw rod to synchronously rotate by rotating the rotating block; a moving ring is threadedly connected to the outer wall of the rotating screw rod, and the moving ring can move along the axial direction of the rotating screw rod due to the transmission action of the thread when the rotating screw rod rotates; the outer wall of the moving ring is fixedly connected with an inner cylinder, which is a hollow tubular structure and has an outer diameter matching the inner diameter of the outer cylinder, and can slide in the outer cylinder, and the inner cylinder moves synchronously with the moving ring when the moving ring moves; limit blocks are fixedly connected to the outer wall of the inner cylinder on both sides, and the limit blocks and the inner cylinder are connected by welding or one-piece forming process; a limit groove matched with the limit blocks is formed in the inner wall of the outer cylinder, and the limit groove is formed along the axial direction of the outer cylinder and has a length designed according to the maximum extension length of the inner cylinder; the inner cylinder is slidingly connected in the outer cylinder, and the limit blocks are slidingly connected in the limit groove, and the cooperation of the limit blocks and the limit groove limits the rotation of the inner cylinder, ensuring that the inner cylinder can only move along the axial direction of the outer cylinder; a lug is fixedly connected to the bottom end of the inner cylinder, and the lug is connected with another commutator at the bottom end of the insulation plate, and the angle adjustment and connection between the inclined support assembly and the insulation plate are realized through the commutator.

[0011] The top end outer wall of the outer cylinder is fixedly connected with an ear, which is connected with the outer cylinder by welding or integral molding process to ensure the connection strength, and a connecting hole is formed in the ear for installing the commutator; the ear is installed with the commutator, and the angle between the outer cylinder and the upper connecting component can be adjusted through the commutator; the other end of the commutator is connected with an angle iron clamp with a clamping assembly for fixing the top end of the inclined support assembly on a suitable support structure; the angle iron clamp is connected with the commutator through the ear fixedly connected on one side, and the ear on the angle iron clamp is connected with the ear on the commutator through a connecting column to realize the detachable connection of the angle iron clamp and the commutator.

[0012] The commutator, the ear and the insulating plate are all connected through the connecting column, when the commutator and the ear are connected, the connecting column passes through the connecting holes of the commutator ear and the ear on the connecting component to be connected, then nuts are installed on both ends of the connecting column and tightened to realize the fixed connection of the commutator and the ear; when the commutator and the insulating plate are connected, a connecting hole matched with the connecting column is formed in the corresponding position of the insulating plate, the connecting column passes through the connecting holes of the commutator ear and the insulating plate, and then is fastened by nuts to realize the connection of the commutator and the insulating plate; the ear is rotationally connected with the connecting column, the diameter of the connecting hole on the ear is slightly larger than the diameter of the connecting column, so that the ear can rotate freely around the connecting column within a certain angle range, thereby realizing the angle adjustment between the connecting components.

[0013] Working principle: during operation, the tool is fixed as a whole by the clamping assembly inside the angle iron clamp, the clamping plate is pushed to slide along the top end limiting strip by rotating the tightening bolt on the side of the angle iron clamp, and the cross arm angle iron is firmly clamped by cooperating with the angle iron clamp; at the same time, the spring compression generates elastic force to enhance the clamping stability, laying a stable foundation for subsequent operation.

[0014] The left and right sleeves are rotated around the hinge shaft of the wire clamp, the wire clamp is opened, the drainage wire is put in, after the sleeves are closed, the inner wall insulation layer closely fits the drainage wire, which not only avoids the contact between the drainage wire and the metal part of the wire clamp to cause current conduction, but also prevents the drainage wire from sliding through friction force; at the same time, the segmented insulating plate can adjust the length through the adjusting hole and the adjusting bolt, adapt to different operation scenes, and ensure the insulation distance between the drainage wire and the tower.

[0015] The rotating block at the top end of the outer cylinder of the inclined support assembly is rotated to drive the internal rotating screw rod to rotate, since the moving ring is threadedly connected with the rotating screw rod and the inner cylinder cannot rotate by cooperating with the limiting groove of the outer cylinder through the limiting block, the moving ring drives the inner cylinder to slide along the outer cylinder in the axial direction, thereby realizing the length adjustment of the inclined support assembly. After the adjustment is completed, the angle is adjusted by the commutator on the ear at the top end of the outer cylinder, the top end of the inclined support assembly is fixed on a suitable support structure by the angle iron clamp with a clamping assembly, the bottom end is connected with the commutator of the insulating plate, forming an inclined support, enhancing the overall stability of the tool, and finally meeting the safe operation conditions of live replacement of insulators.

[0016] The motor on the lifting platform is started, and the motor output end drives the driving gear to rotate, and the driving gear drives the driven gear to rotate through meshing. Since the driven gear is threadedly connected with the lifting lead screw, and the lifting lead screw is also threadedly connected with the lifting platform, the rotation of the driven gear is converted into the vertical lifting movement of the lifting lead screw, thereby driving the bottom end rotatingly connected insulating plate, and the wire clamp and the inclined support assembly below the insulating plate are synchronously lifted through the commutator, so that the precise adjustment of the working position is realized.

[0017] In the lifting process of the lifting lead screw, the ratchet wheel meshing with the lifting lead screw rotates with the movement of the lifting lead screw. When the lifting lead screw rises, the pawl flexibly rotates under the push of the ratchet wheel ratchet, and does not hinder the movement. When the lifting lead screw needs to be kept at a certain height, if there is a downward movement trend, the pawl is clamped into the ratchet wheel ratchet under the action of its own gravity, preventing the ratchet wheel from rotating in the reverse direction, locking the position of the lifting lead screw through the meshing relationship, and preventing accidental sliding.

[0018] The present application has the following beneficial effects: 1. Ensure the safety of live working The tool is equipped with an insulating plate and an insulating layer in the inner wall of the wire clamp, which can strictly isolate the current lead wire from the tower and the tool metal parts to prevent current conduction. At the same time, the position and angle of the current lead wire can be controlled to avoid grounding faults caused by the gravity or angle of the current lead wire, and the safe live replacement of the insulator of the 220kV line string is realized without the need of power off.

[0019] 2. Improve the stability of the tool The clamping assembly in the angle iron clamp can firmly clamp the cross arm angle iron by rotating the bolt to push the clamping plate, and cooperate with the limiting strip and the spring, so as to prevent the tool from moving; the length and angle of the inclined support assembly can be adjusted to form a stable inclined support, thereby enhancing the stability of the overall structure; the ratchet wheel and pawl structure can also lock the position of the lifting lead screw to avoid accidental sliding, thereby further ensuring the reliability of the working process.

[0020] 3. Adapt to various working scenes The insulating plate is designed in a segmented manner, and the length can be freely adjusted through the adjusting hole and the adjusting bolt to meet the different line spacing requirements; the commutator can flexibly change the connection angle of the wire clamp, the inclined support assembly and the insulating plate to adapt to different tower structures and working positions; the length of the inclined support assembly can be adjusted by rotating the lead screw to further improve the adaptability of the tool to complex working scenes.

[0021] 4. Realize precise adjustment of working position The motor drives the lifting lead screw to vertically lift through gear transmission, which can accurately adjust the height of the insulating plate, the wire clamp and the current lead wire without manual adjustment, thereby reducing the labor consumption. The whole adjustment process is controllable, the current lead wire can be quickly adjusted to the appropriate working position, the working time is shortened, and the efficiency of replacing the insulator is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A perspective view of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 2 A side view of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 3 A cross-sectional view of an inclined support assembly of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 4 A structure view of a commutator of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 5 A structure view of a wire clamp of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 6 A structure view of a ratchet pawl of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application; Figure 7 A structure view of a clamping plate of a complete set of tools for live replacement of 220kV line insulator hanger string according to the present application.

[0023] Legend: 1, angle iron clamp; 2, limiting strip; 3, clamping plate; 4, groove; 5, tightening bolt; 6, spring; 7, lifting platform; 8, motor; 9, driving gear; 10, driven gear; 11, lifting screw; 12, fixed plate; 13, ratchet; 14, pawl; 15, insulating plate; 16, adjusting hole; 17, adjusting bolt; 18, commutator; 181, upper connecting plate; 182, lower connecting plate; 183, connecting shaft; 19, connecting column; 20, wire clamp; 201, left sleeve; 202, right sleeve; 203, insulating layer; 204, hinge shaft; 21, outer cylinder; 22, inner cylinder; 23, rotating block; 24, rotating screw; 25, moving ring; 26, limiting block; 27, limiting groove; 28, hanging ear; 29, fixed shaft; 30, cross arm angle iron. DETAILED DESCRIPTION

[0024] The application will be further described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] The insulator of the string hanging insulator of the current-carrying wire on the strain tower of a 220kV power transmission line is aged and the umbrella skirt is damaged due to long-term operation, and needs to be replaced in time to prevent flashover failure. In order to guarantee power supply reliability, the tool set for live replacement of the string hanging insulator of the 220kV line is used to carry out non-power-off operation.

[0026] The tool set is transported to the operation site, and each component is checked to be intact. According to the structure of the cross arm and the position of the current-carrying wire, the length of the insulating plate 15 is adjusted: two sections of the insulating plate are fixed in the adjusting hole 16 through the adjusting bolt 17 to ensure that the overall length is suitable for the distance between the cross arm and the wire. The wire clamp 20 is installed: the left sleeve 201 and the right sleeve 202 are opened, it is confirmed that the inner wall insulating layer 203 is not damaged, and the hinge shaft 204 rotates flexibly. The inclined support assembly is assembled: the inner cylinder 22 is inserted into the outer cylinder 21, it is ensured that the limiting block 26 is clamped into the limiting groove 27, and the top rotating block 23 is rotated to test the flexibility. The commutator 18 is connected to the wire clamp, the inclined support assembly and the bottom end of the insulating plate through the connecting column 19, and it is ensured that each connection point can rotate freely to adapt to the change of angle.

[0027] The operator enters the operation area, and the angle iron clamp 1 is aligned with the cross arm angle iron 30. The rotating screw 5 is rotated, the clamp plate 3 is pushed to slide inward along the limiting strip 2, and the cross arm angle iron is clamped. During the clamping process, the spring 6 is compressed to provide a continuous clamping force to prevent loosening and ensure that the tool is stable and reliable.

[0028] The bottom end of the inclined support assembly is connected to the insulating plate 15 through the commutator. The angle of the inclined support is adjusted so that it points to another stable angle iron of the tower body. The second angle iron clamp 1 is connected to the lug 28 of the outer cylinder at the top end of the inclined support, and after adjusting the angle through the commutator, it is firmly clamped on the other side of the angle iron of the tower body. The rotating block 23 is rotated to adjust the length of the inclined support so that it is in a pre-tightened state, forming a stable triangular support structure and enhancing the overall rigidity.

[0029] The left and right sleeves of the wire clamp are opened, and the current-carrying wire below the insulator to be replaced is smoothly placed into the wire clamp. The sleeves are closed, and the insulating layer 203 tightly wraps the current-carrying wire to achieve electrical isolation and prevent metal contact from causing grounding.

[0030] The motor 8 on the lifting platform 7 is started, and the motor drives the driving gear 9 to rotate. The driving gear drives the driven gear 10 to rotate, and then drives the lifting lead screw 11 to slowly rise. The lifting lead screw drives the insulating plate 15 and the wire clamp and the current-carrying wire below it to rise vertically synchronously, and gradually releases the tension of the original insulator.

[0031] During the rising process, the ratchet 13 rotates with the movement of the lifting lead screw, and the pawl 14 slides between the ratchet teeth without hindering the rising. When the current-carrying wire rises to the appropriate height and the original insulator is completely relaxed, the motor is stopped. If the lead screw has a downward trend, the pawl is automatically clamped into the ratchet under the action of gravity to achieve mechanical self-locking and prevent accidental falling.

[0032] The operator removes the old insulator and installs a new one. After the new insulator is connected, the motor is reversed and the lifting screw is slowly lowered, smoothly transferring the current line to the new insulator. After confirming that the connection is secure, the line clamp is loosened and the tool is retracted.

[0033] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing detailed description of the application has been made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or the equivalent replacement of some of the technical features described in the foregoing embodiments, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A complete set of tools for live-line replacement of 220kV line string insulators, including angle iron clamps (1), characterized in that: The angle iron clamp (1) is equipped with a clamping assembly inside. A lifting platform (7) is fixedly connected to one side of the bottom end of the angle iron clamp (1). A motor (8) is installed on the lifting platform (7). A drive gear (9) is fixedly connected to the output end of the motor (8). A driven gear (10) meshing with the drive gear (9) is rotatably connected to the lifting platform (7). A lifting screw (11) is threadedly connected to the inner wall of the driven gear (10). The lifting screw (11) is threadedly connected to the lifting platform (7). An insulating plate (15) is rotatably connected to the bottom end of the lifting screw (11). Two commutators (18) are installed at the bottom end of the insulating plate (15). The insulating plate (15) is connected to the wire clamp (20) and the inclined support assembly respectively through the commutators (18).

2. The complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: The clamping assembly includes a limiting strip (2), which is fixedly connected to the top of the angle iron clamp (1). A tightening bolt (5) is threadedly connected to the side of the angle iron clamp (1). A clamping plate (3) is rotatably connected to the end of the tightening bolt (5). A groove (4) is provided at the top of the clamping plate (3) to slide with the limiting strip (2). A spring (6) is installed between the side of the clamping plate (3) rotatably connected to the tightening bolt (5) and the angle iron clamp (1).

3. The complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: A fixed plate (12) is fixedly connected to the lifting platform (7). One end of the fixed plate (12) is fixedly connected to the angle iron clamp (1). Two fixed shafts (29) are fixedly connected to one side of the fixed plate (12). A ratchet (13) is rotatably connected to one of the fixed shafts (29), and a pawl (14) is rotatably connected to the other fixed shaft (29). The ratchet (13) and the pawl (14) are engaged by ratchet teeth. The ratchet (13) is engaged with the lifting screw (11).

4. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: The insulating plate (15) is divided into two sections. Each section of the insulating plate (15) has multiple adjustment holes (16). The two sections of the insulating plate (15) are connected by adjustment bolts (17) that cooperate with the adjustment holes (16).

5. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: The commutator (18) includes an upper connecting plate (181) and a lower connecting plate (182), with a connecting shaft (183) rotatably connected between the upper connecting plate (181) and the lower connecting plate (182), and a lug (28) fixedly connected to both the upper connecting plate (181) and the lower connecting plate (182).

6. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: The clamp (20) includes a left sleeve (201) and a right sleeve (202). Both the left sleeve (201) and the right sleeve (202) are rotatably connected to the hinge shaft (204). An insulating layer (203) is fixedly connected to the inner wall of both the left sleeve (201) and the right sleeve (202). A hanging ear (28) is fixedly connected to the top of both the left sleeve (201) and the right sleeve (202). The hanging ear (28) is connected to a commutator (18) at the bottom of the insulating plate (15).

7. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: The inclined support assembly includes an outer cylinder (21), a rotating screw (24) is rotatably connected to the top of the inner end of the outer cylinder (21), the top of the rotating screw (24) extends out of the outer cylinder (21) and is fixedly connected to a rotating block (23), a moving ring (25) is threadedly connected to the outer wall of the rotating screw (24), an inner cylinder (22) is fixedly connected to the outer wall of the moving ring (25), limit blocks (26) are fixedly connected to both sides of the outer wall of the inner cylinder (22), a limit groove (27) that cooperates with the limit block (26) is opened on the inner wall of the outer cylinder (21), the inner cylinder (22) is slidably connected to the inside of the outer cylinder (21), the limit block (26) is slidably connected to the inside of the limit groove (27), and a hanging ear (28) is fixedly connected to the bottom end of the inner cylinder (22), the hanging ear (28) is connected to another commutator (18) at the bottom end of the insulating plate (15).

8. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 7, characterized in that: A lug (28) is fixedly connected to the top outer wall of the outer cylinder (21). A commutator (18) is installed on the lug (28). An angle iron clip (1) with a clamping assembly is connected to the other end of the commutator (18). The angle iron clip (1) is connected to the commutator (18) through the lug (28) fixedly connected on one side.

9. A complete set of tools for live-line replacement of 220kV line insulator strings according to claim 1, characterized in that: Both the lug (28) and the insulating plate (15) are provided with connection holes. The commutator (18) is connected to the lug (28) and the insulating plate (15) through a connecting post (19) that mates with the connection hole. The lug (28) and the connecting post (19) are rotatably connected.

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