Special device for replacing tubular bus connecting lead in transformer substation

Abstract

The invention relates to a special device for replacing a tubular bus connecting lead in a transformer substation, which comprises a hoisting mechanism, the hoisting mechanism comprises a mounting assembly and a hoisting rope, the mounting assembly is used for being mounted on a mother tube, and the hoisting rope is movably connected with the mounting assembly; the wire clamping mechanism is connected with the hoisting rope, and the wire clamping mechanism is used for being detachably connected with a drainage wire; the clamping mechanism comprises a fixing assembly and a fastener assembly which are connected with each other, the fixing assembly is used for being installed on the mother pipe, the fastener assembly is used for being detachably connected with the drainage plate, and the drainage plate is connected with the drainage wire. According to the scheme, high-altitude operation is not needed, an operator can finish replacement operation by standing on the ground, the labor load and intensity of the operator can be effectively relieved, potential safety hazards can be eliminated, replacement operation is convenient and labor-saving, complex and tedious special tools are not needed, and the replacement efficiency is improved. And the normal maintenance of the variable-viscosity equipment and the drainage wire replacement operation efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power maintenance auxiliary equipment, and in particular to a special device for replacing mother pipe connection leads in a substation. Background Art

[0002] Substations are the core components of power systems, and the maintenance and inspection of their equipment is particularly important. In the regular maintenance of substations, replacing the mother tube connection leads is a basic and important work content, especially in regular inspections, fault repairs and equipment upgrades, the replacement frequency of the mother tube connection leads is relatively high.

[0003] At present, the replacement method of the mother pipe connecting lead mainly relies on manual work, which has many problems such as safety hazards, high labor intensity and low operation efficiency. Specifically, the operators need to operate at high altitudes and face the risk of falling and accidental slipping of heavy objects. Safety accidents occur frequently, posing a potential threat to personnel and equipment; secondly, the mother pipe connecting lead is usually heavy, and the staff needs to cooperate with multiple people, resulting in great physical exertion. Fatigued operators are prone to operating errors, which in turn affects the safety and efficiency of the operation; thirdly, the traditional operation method has a complicated process and requires the use of a variety of tools for assistance, which leads to longer operation time and affects the normal operation of the substation. Especially in the case of emergency repairs, delays in the progress of the operation may bring more problems.

[0004] In view of the various defects existing in traditional operations, a safer and more efficient special device is urgently needed to optimize the replacement operation of the mother tube connection lead, improve the operation efficiency, ensure the safety of the operators and the normal operation of the equipment. Summary of the invention

[0005] Based on this, it is necessary to provide a special device for replacing the mother pipe connection lead in a substation to address the problems of time-consuming and labor-intensive operation, low operating efficiency and potential safety hazards.

[0006] The present application provides a special device for replacing a mother tube connection lead in a substation, which comprises:

[0007] A hanging mechanism, the hanging mechanism comprising a mounting assembly and a hanging rope, the mounting assembly is used to be mounted on the mother pipe, and the hanging rope is movably connected to the mounting assembly;

[0008] A wire clamp mechanism, the wire clamp mechanism is connected to the suspension rope, and the wire clamp mechanism is used to be detachably connected to the drainage line; and

[0009] The clamping mechanism comprises a fixing assembly and a hook assembly connected to each other, wherein the fixing assembly is used to be installed on the mother pipe, and the hook assembly is used to be detachably connected to a drainage plate, wherein the drainage plate is connected to the drainage line.

[0010] When the special device for replacing the mother tube connection lead of the substation of the present scheme is used, the clamping mechanism is first assembled into one with the wire clamping mechanism, and then the installation component is fixed to the mother tube, and the lifting rope is movably connected to the installation component, and then the lifting rope is connected to the wire clamping mechanism, and then the fixing component of the clamping mechanism is installed on the mother tube, and then the hook and buckle component is hooked and fixed to the drain plate, and the wire clamping mechanism and the drain line are clamped and fixed; after that, the connecting bolts on the mother tube clamp and the drain plate can be removed, and at this time, the drain plate and the drain line are restricted by the wire clamping mechanism and the hook and buckle component and will not fall off. After the connection bolts are removed, the hook and buckle component is released to put the drain plate in a released state. , the operator standing on the ground slowly loosens the lifting rope to lower the drainage plate and drainage line to the ground to facilitate the drainage line replacement operation. After the replacement is completed, pull the lifting rope, and then lift the new drainage plate and its drainage line, pipe mother clamp and other components to the high mother pipe position for installation; compared with the existing technology, this solution does not require high-altitude operations, and the operator can complete the replacement operation while standing on the ground, which can not only effectively reduce the labor load and intensity of the operators, but also eliminate potential safety hazards. The replacement operation is convenient and labor-saving, and no complicated and cumbersome special tools are required, which helps to improve the normal maintenance of the variable sticky belt equipment and the efficiency of drainage line replacement operations.

[0011] The technical solution of this application is further described below:

[0012] In one embodiment, the installation assembly includes a rope loop and a lifting pulley, the rope loop is used to be mounted on the mother pipe, the lifting pulley is installed on the rope loop, and the lifting rope can be slidably wrapped around the pulley of the lifting pulley.

[0013] In one embodiment, the wire clamp mechanism includes a connecting rod, a rope hook and a wire clamp fixture, the rope hook is arranged in the middle of the connecting rod and connected to one end of the hanging rope, and the wire clamp fixture is arranged at the end of the connecting rod and is used to be detachably connected to the drainage line.

[0014] In one of the embodiments, the wire clamp fixture includes a fixed clamp, a rotating shaft, a movable clamp and a fastening bolt group. The fixed clamp is installed at the end of the connecting rod, and the fixed clamp is rotatably connected to the movable clamp through the rotating shaft. The movable clamp can be opened or closed with the fixed clamp. In the closed state, the fastening bolt group locks the movable clamp and the fixed clamp.

[0015] In one embodiment, the fixing mechanism includes a fixed cross arm and a fixed seat, the fixed cross arm is used to be installed on the mother pipe, the fixed seat is connected to the end of the fixed cross arm, and the fixed seat is detachably connected to the hook assembly.

[0016] In one of the embodiments, the fixed cross arm is provided with an arc-shaped concave surface, and the arc-shaped concave surface is used to fit with the arc-shaped outer tube wall of the mother tube.

[0017] In one embodiment, the hook assembly includes a nut seat, a screw rod and a driving handle, the nut seat is arranged on the fixed seat, the screw rod is inserted into the nut seat so as to be able to be raised and lowered, the driving handle is threadedly connected to the screw rod, and the driving handle is used to drive the screw rod to be raised and lowered along its own axial direction.

[0018] In one embodiment, the fixing seat is provided with a receiving groove, the side wall of the receiving groove is provided with a clamping groove, the outer wall of the nut seat is provided with a clamping protrusion, the nut seat is arranged in the receiving groove, and the clamping protrusion is clamped in the clamping groove.

[0019] In one of the embodiments, a movable stopper is further provided on the fixing seat, and the stopper can lock or release the locking protrusion.

[0020] In one embodiment, the hook assembly also includes an extension joint and a limit hook, one end of the extension joint is rotatably connected to the lower end of the screw rod, and the other end of the extension joint is rotatably connected to the limit hook, and the limit hook is used to hook or release the drain plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a schematic structural diagram of a special device for replacing a mother tube connection lead in a substation according to an embodiment.

[0024] FIG. 2 is a partial structural schematic diagram of the hook and buckle assembly in FIG. 1 .

[0025] FIG. 3 is a schematic diagram of a partial structure of the fixing assembly in FIG. 1 .

[0026] FIG. 4 is a schematic structural diagram of a wire clamp mechanism.

[0027] Description of reference numerals:

[0028] 100. Special device for replacing mother connecting lead wire in substation; 10. Hoisting mechanism; 11. Rope loop; 12. Hoisting pulley; 13. Hoisting rope; 20. Wire clamp mechanism; 21. Connecting rod; 22. Rope hook; 23. Wire clamp fixture; 231. Fixed clamp; 232. Rotating shaft; 233. Movable clamp; 234. Fastening bolt group; 30. Clamping mechanism; 31. Fixed assembly; 311. Fixed cross arm; 311a. Arc concave surface; 312. Fixed seat; 3121. Accommodating groove; 3122. Clamping groove; 32. Hook assembly; 321. Nut seat; 3211. Clamping convex; 322. Screw rod; 323. Driving handle; 324. Stopper; 325. Extension joint; 326. Limiting hook; 200. Mother pipe; 300. Drainage plate; 400. Drainage line. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] 1 , which shows a special device 100 for replacing a mother pipe connecting lead in a substation according to an embodiment of the present application. The device 100 includes a hanging mechanism 10 , a wire clamp mechanism 20 , and a clamping mechanism 30 .

[0036] The hanging mechanism 10 includes an installation component and a hanging rope 13, the installation component is used to be installed on the mother pipe 200, and the hanging rope 13 is movably connected to the installation component; the wire clamp mechanism 20 is connected to the hanging rope 13, and the wire clamp mechanism 20 is used to be detachably connected to the drainage line 400; the clamping mechanism 30 includes a connected fixing component 31 and a hook component 32, the fixing component 31 is used to be installed on the mother pipe 200, and the hook component 32 is used to be detachably connected to the drainage plate 300, wherein the drainage plate 300 is connected to the drainage line 400.

[0037] The hanging rope 13 can be any one of hemp rope, steel wire rope, chain, etc., and can be flexibly selected according to actual needs.

[0038] The mother pipe 200 is a circular pipe and can be made of any material such as metal, non-metal, or composite material.

[0039] In summary, the implementation of the technical solution of this embodiment will achieve the following beneficial effects: when the special device 100 for replacing the mother pipe connection lead of the substation of this solution is used, the clamping mechanism 30 is first assembled into one with the wire clamping mechanism 20, and then the installation component is fixed to the mother pipe 20, and the hanging rope 13 is movably connected to the installation component, and then the hanging rope 13 is connected to the wire clamping mechanism 20, and then the fixing component 31 of the clamping mechanism 30 is installed on the mother pipe 200, and then the hook component 32 is hooked and fixed to the drainage plate 300, and the wire clamping mechanism 20 is clamped and fixed to the drainage line 400; after that, the mother pipe clamp and the lead can be The connecting bolts on the flow plate 300 are removed. At this time, the drainage plate 300 and the drainage line 400 are restricted by the wire clamp mechanism 20 and the hook assembly 32 and will not fall. After the connecting bolts are removed, the hook assembly 32 is loosened to release the drainage plate 300. The operator standing on the ground slowly loosens the lifting rope 13 to lower the drainage plate 300 and the drainage line 400 to the ground to facilitate the replacement of the drainage line 400. After the replacement is completed, the lifting rope 13 is pulled, and the new drainage plate 300 and its drainage line 400, the mother pipe clamp and other components are lifted to the high position of the mother pipe 200 for installation.

[0040] Compared with the existing technology, this solution does not require high-altitude operations. The operators can complete the replacement work while standing on the ground. It can not only effectively reduce the labor load and intensity of the operators, but also eliminate potential safety hazards. The replacement operation is convenient and labor-saving, and no complicated and cumbersome special tools are required. It helps to improve the normal maintenance of the variable sticky belt equipment and the efficiency of the drainage line 400 replacement operation.

[0041] Please continue to refer to FIG. 1 . In one embodiment, the installation assembly includes a rope loop 11 and a lifting block 12. The rope loop 11 is used to be mounted on the mother pipe 200. The lifting block 12 is mounted on the rope loop 11. The lifting rope 13 can be slidably mounted on the pulley of the lifting block 12. The rope loop 11 is mounted on the mother pipe 200. The rope loop 11 and the mother pipe 200 are reliably mounted to form a hanging foundation. Then the lifting block 12 and the rope loop 11 are installed. When the lifting rope 13 is pulled or released, the replacement parts such as the drainage plate 300 and its drainage line 400 can be lifted from the ground to a high place or lifted from a high place to the ground. Only one operator is required to operate on the ground throughout the whole process. There is no need to perform aerial work. The number of operators required is small, which greatly improves the efficiency of the replacement operation and reduces the operation cost.

[0042] It should be noted that, in order to further free up manpower, a power device may be installed on the ground, and the power device is connected to one end of the hanging rope 13, so that the hanging rope 13 can be automatically driven to move.

[0043] Please continue to refer to Figures 1 and 4. In addition, in one embodiment, the wire clamp mechanism 20 includes a connecting rod 21, a rope hook 22 and a wire clamp fixture 23. The rope hook 22 is arranged in the middle of the connecting rod 21 and connected to one end of the hanging rope 13. The wire clamp fixture 23 is arranged at the end of the connecting rod 21 and is used to be detachably connected to the drainage line 400. The connecting rod 21 is used to fix the rope hook 22 so that the rope hook 22 is connected to the hanging rope 13. The wire clamp fixture 23 is clamped and fixed to the drainage line 400, so that by driving the hanging rope 13, the wire clamp mechanism 20 and the drainage line 400 can be driven to perform lifting and lowering movements.

[0044] Preferably, in the present application, two drainage lines 400 are led out from the bottom of the drainage plate 300, so a wire clamp 23 is respectively installed at both ends of the length direction of the connecting rod 21, and each wire clamp 23 is clamped and fixed to a corresponding drainage line 400.

[0045] Please continue to refer to Figure 4. Specifically, the wire clamp fixture 23 in the above embodiment includes a fixed clamp 231, a rotating shaft 232, a movable clamp 233 and a fastening bolt group 234. The fixed clamp 231 is installed at the end of the connecting rod 21, and the fixed clamp 231 is rotatably connected to the movable clamp 233 through the rotating shaft 232. The movable clamp 233 can be opened or closed with the fixed clamp 231. In the closed state, the fastening bolt group 234 locks the movable clamp 233 and the fixed clamp 231.

[0046] During installation, loosen the fastening bolt group 234, rotate the movable clamp 233 to make it away from the fixed clamp 231, and conveniently install the drainage line 400 into the clamping cavity of the wire clamp fixture 23; then rotate and reset the movable clamp 233 to close it with the fixed clamp 231, and finally tighten the bolt group 234, and the drainage line 400 can be clamped and fixed between the movable clamp 233 and the fixed clamp 231. The structure and use of the wire clamp fixture 23 are simple, and the drainage line 400 is clamped firmly and reliably.

[0047] In order to prevent the drainage wire 400 from being damaged due to excessive clamping force, a flexible pad is installed on the inner wall of the clamping cavity formed by the fixed clamp 231 and / or the movable clamp 233. For example, the flexible pad can be but not limited to soft glue, foam, etc.

[0048] Please continue to refer to Figures 1 and 3. In addition, based on any of the above embodiments, the fixing mechanism includes a fixing cross arm 311 and a fixing seat 312. The fixing cross arm 311 is used to be installed on the mother tube 200. The fixing seat 312 is connected to the end of the fixing cross arm 311. The fixing seat 312 is detachably connected to the hook assembly 32. By assembling the fixing cross arm 311 with the mother tube 200, the fixing mechanism can be installed and fixed to the mother tube 200; the fixing seat 312 is used to be connected to the hook assembly 32. When the hook assembly 32 is hooked with the drain plate 300, the drain plate 300, the drain line 400 and other components can be clamped and fixed, ensuring that after the connecting bolts on the mother tube clamp and the drain plate 300 are removed, the drain plate 300 and other components will not fall from a high altitude and cause a safety accident.

[0049] Preferably, the fixed cross arm 311 is provided with an arc-shaped concave surface 311a, and the arc-shaped concave surface 311a is used to fit with the arc-shaped outer tube wall of the mother tube 200. The arc-shaped concave surface 311a fits with the arc-shaped outer tube wall of the mother tube 200, increases the contact support area, and realizes that the fixed cross arm 311 is more stably installed on the mother tube 200.

[0050] Please continue to refer to Figures 1 and 2. In another embodiment, the hook assembly 32 includes a nut seat 321, a screw rod 322 and a driving handle 323. The nut seat 321 is arranged on the fixed seat 312, and the screw rod 322 is arranged in the nut seat 321 so as to be able to be raised and lowered and moved. The driving handle 323 is threadedly connected to the screw rod 322, and the driving handle 323 is used to drive the screw rod 322 to be raised and lowered along its own axial direction.

[0051] During installation, the driving handle 323 is rotated clockwise, and the driving handle 323 drives the screw rod 322 to descend, causing the hook assembly 32 to descend and relax so that it can hook the lower side of the guide plate 300. Then, the driving handle 323 is rotated counterclockwise again, and the screw rod 322 drives the hook assembly 32 to rise, so that the hook assembly 32 can hook the guide plate 300. The threaded pair of the screw rod 322 and the driving handle 323 has a self-locking effect, thereby ensuring that the clamping mechanism 30 firmly fixes the guide plate 300 to prevent the guide plate 300 from falling after the connecting bolts are removed.

[0052] Please continue to refer to FIG. 3 , further, the fixing seat 312 is provided with a receiving groove 3121, the groove side wall of the receiving groove 3121 is provided with a clamping groove 3122, the outer wall of the nut seat 321 is provided with a clamping protrusion 3211, the nut seat 321 is provided in the receiving groove 3121, and the clamping protrusion 3211 is clamped in the clamping groove 3122. The nut seat 321 is clamped in the receiving groove 3121 to form a first limiting effect, and the clamping protrusion 3211 is clamped in the clamping groove 3122, which further limits the freedom of movement of the lock assembly, ensuring that the lock assembly and the fixing assembly 31 are assembled reliably and the structure is stable.

[0053] In order to prevent the locking protrusion 3211 from accidentally falling out of the locking slot 3122 , a movable stopper 324 is further provided on the fixing seat 312 , and the stopper 324 can lock or release the locking protrusion 3211 .

[0054] For example, the stopper 324 is rotatably installed on the outer side of the fixing seat 312 through a pin shaft. In the initial state, the stopper 324 rotates away from the slot 3122. When the protrusion 3211 is inserted into the slot 3122, the stopper 324 is rotated to above the part of the protrusion 3211 extending into the slot 3122, so as to press the protrusion 3211 against the slot 3122, thereby limiting the nut seat 321 from accidentally moving and loosening and falling off.

[0055] Furthermore, the hook assembly 32 further includes an extension joint 325 and a limit hook 326. One end of the extension joint 325 is rotatably connected to the lower end of the screw rod 322, and the other end of the extension joint 325 is rotatably connected to the limit hook 326. The limit hook 326 is used to hook or release the drainage plate 300. Since the extension joint 325 has a certain length and is rotatably connected to the limit hook 326 and the screw rod 322, on the one hand, the length of the limit hook 326 can be increased, so that it can be used to hook the drainage plate 300 with a longer length; on the other hand, the limit hook 326 can also form a certain angle arrangement with the extension joint 325, so as to meet the hooking needs of the drainage plate 300 with an irregular shape.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A special device for replacing the mother tube connection lead in a substation, characterized in that: include: A hanging mechanism, the hanging mechanism comprising a mounting assembly and a hanging rope, the mounting assembly is used to be mounted on the mother pipe, and the hanging rope is movably connected to the mounting assembly; A wire clamp mechanism, the wire clamp mechanism is connected to the suspension rope, and the wire clamp mechanism is used to be detachably connected to the drainage line; and The clamping mechanism comprises a fixing assembly and a hook assembly connected to each other, wherein the fixing assembly is used to be installed on the mother pipe, and the hook assembly is used to be detachably connected to a drainage plate, wherein the drainage plate is connected to the drainage line.

2. The special device for replacing the mother tube connection lead of a substation according to claim 1 is characterized in that: The installation assembly comprises a rope loop and a lifting pulley, wherein the rope loop is used to be sleeved on the mother pipe, the lifting pulley is installed on the rope loop, and the lifting rope can be slidably wound around the pulley of the lifting pulley.

3. The special device for replacing the mother tube connection lead of a substation according to claim 1 is characterized in that: The wire clamp mechanism includes a connecting rod, a rope hook and a wire clamp fixture. The rope hook is arranged at the middle part of the connecting rod and connected to one end of the hanging rope. The wire clamp fixture is arranged at the end of the connecting rod and is used to be detachably connected to the drainage line.

4. The special device for replacing the mother tube connection lead of a substation according to claim 3 is characterized in that: The wire clamp fixture includes a fixed clamp, a rotating shaft, a movable clamp and a fastening bolt group. The fixed clamp is installed at the end of the connecting rod, and the fixed clamp is rotatably connected to the movable clamp through the rotating shaft. The movable clamp can be opened or closed with the fixed clamp. In the closed state, the fastening bolt group locks the movable clamp and the fixed clamp.

5. The special device for replacing the mother tube connection lead of a substation according to claim 1 is characterized in that: The fixing mechanism comprises a fixing cross arm and a fixing seat, wherein the fixing cross arm is used to be installed on the mother pipe, the fixing seat is connected to the end of the fixing cross arm, and the fixing seat is detachably connected to the hook assembly.

6. The special device for replacing the mother tube connection lead of a substation according to claim 5 is characterized in that: The fixed cross arm is provided with an arc-shaped concave surface, and the arc-shaped concave surface is used to fit and adhere to the arc-shaped outer tube wall of the mother tube.

7. The special device for replacing the mother tube connection lead of a substation according to claim 5 is characterized in that: The hook assembly includes a nut seat, a screw rod and a driving handle. The nut seat is arranged on the fixed seat. The screw rod is inserted into the nut seat so as to be able to be raised and lowered. The driving handle is threadedly connected to the screw rod. The driving handle is used to drive the screw rod to be raised and lowered along its own axial direction.

8. The special device for replacing the mother tube connection lead of a substation according to claim 7 is characterized in that: The fixing seat is provided with a receiving groove, a groove side wall of the receiving groove is provided with a clamping groove, an outer wall of the nut seat is provided with a clamping protrusion, the nut seat is arranged in the receiving groove, and the clamping protrusion is clamped in the clamping groove.

9. The special device for replacing the mother tube connection lead of a substation according to claim 8, characterized in that: The fixing seat is also provided with a movable stopper sheet, and the stopper sheet can lock or release the clamping protrusion.

10. The special device for replacing the mother tube connection lead of a substation according to claim 7, characterized in that: The hook assembly also includes an extension joint and a limit hook, one end of the extension joint is rotatably connected to the lower end of the screw rod, and the other end of the extension joint is rotatably connected to the limit hook, and the limit hook is used to hook or release the drainage plate.

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