Transformer bushing maintenance auxiliary tool and installation method thereof

Abstract

The invention discloses an auxiliary tool for overhauling a transformer bushing. Comprising a safety ladder, a first fixing structure arranged at the bottom of the safety ladder and used for fixing the safety ladder to a transformer base, a second fixing structure arranged in the middle of the safety ladder, tensioning the safety ladder backwards and being fixed to the transformer base, and a third fixing structure arranged on the rear side of the top of the safety ladder and used for being fixed to the top of the sleeve. And a folding operation platform is arranged on the safety ladder. According to the operation platform, the safety ladder is simple in structure, light and convenient to carry and rapid to install, an operator climbs the transformer sleeve base and reaches the sleeve through the safety ladder, the operator does not make contact with the sleeve so that the sleeve can be prevented from being damaged, the operation platform is suitable for sleeves of different manufacturers, the operation platform can be folded, transportation and carrying are convenient, the labor efficiency is improved, and personal equipment safety is guaranteed. When a transformer bushing maintenance test is carried out, the bushing does not need to be directly climbed, and the tiptoe does not need to extend into a gap of a porcelain skirt of the bushing for climbing operation, so that personal casualty safety accidents are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of power transformation equipment, and in particular to a transformer bushing maintenance auxiliary tool and an installation method thereof. Background Art

[0002] In the field of electric power, transformers are important electric power equipment, and bushings, as their main accessories, play a key role in external lead, support and insulation. With the development of technology, the creepage distance of the bushing's outer porcelain insulation continues to increase, which requires that the exposed vertical height of the bushing must also be increased accordingly to ensure its insulation and anti-pollution flashover capabilities.

[0003] In routine inspection and maintenance work, traditional methods often rely only on boom trucks or manual direct climbing of casings, but these methods have certain limitations. The use of boom trucks requires a long preparation time and low work efficiency. In some cases, it is restricted by factors such as the wiring method, terrain, and distance of the substation, resulting in the inability to use boom trucks at the work site. If manual direct climbing of the casing is used, the worker needs to put his toes into the gap of the casing porcelain skirt to achieve the high-altitude operation. At this time, the force area of ​​the sole of the foot is small and unstable, and the safety regulations clearly stipulate that the safety belt is not allowed to be hung on unstable objects such as casings. This not only poses certain safety hazards, but also causes panic to the workers and easily causes work-related accidents such as personnel slipping.

[0004] In view of this, there is an urgent need to develop an auxiliary tool specifically for transformer bushing maintenance to ensure that the maintenance work can be carried out safely and efficiently. Summary of the invention

[0005] In view of this, the present application provides a transformer bushing installation auxiliary tool and an installation method thereof, which are used to solve the technical problems of unsafe and inefficient bushing maintenance in the prior art.

[0006] In order to achieve one or part or all of the above purposes or other purposes, the present application proposes a transformer bushing maintenance auxiliary tool, including a safety ladder, a first fixing structure arranged at the bottom of the safety ladder for fixing the safety ladder to the transformer base, a second fixing structure arranged in the middle of the safety ladder and pulling the safety ladder backwards and fixing it to the transformer base, and a third fixing structure arranged at the rear side of the top of the safety ladder for fixing it to the top of the bushing, and a foldable working platform is provided on the safety ladder.

[0007] Preferably, the first fixing structure includes two seat clamps, which are respectively fixed at the two ends of the bottom of the safety ladder, each seat clamp includes a seat clamp body in a C shape, a plug-in portion provided at the top of the seat clamp body and close to the open end, a first adjustment column provided at the top of the seat clamp body and passing through, and a first adjustment bolt threadedly locked with the first adjustment column, the plug-in portion extends into the bottom of the safety ladder, the opening of the seat clamp body is provided on the transformer base, and the first adjustment bolt extends into the first adjustment column and presses the transformer base. When the plug-in portion is inserted into the bottom of the ladder beam, a fulcrum is formed with the plug-in portion, and when the first adjustment bolt threadedly cooperates with the first adjustment column to press the transformer base, downward pressure is applied to the seat clamp, and the plug-in portion at the other end is applied with an upward force based on the principle of leverage, and because the plug-in portion is inserted into the cavity at the bottom of the ladder beam, the upward force makes the plug-in connection between the two more secure, thereby firmly fixing the ladder beam.

[0008] Preferably, the second fixing structure includes two clamps, which are arranged on the back of the transformer base and tighten and fix the safety ladder from the rear end through an inclined pull rod. In this way, the safety ladder is fixed from the front through the two clamps and then fixed from the back through the two clamps, so that the safety ladder is fixed more comprehensively and firmly.

[0009] Preferably, the caliper includes a C-shaped caliper body, a lifting ring disposed at the top of the caliper body and close to the open end, a second adjustment column disposed at the top of the seat caliper body and passing through, and a second adjustment bolt threadedly locked with the second adjustment column, the opening of the caliper body is clamped on the transformer base, the second adjustment bolt extends into the second adjustment column and presses the transformer base, and the lifting ring is fixedly connected to one end of the pull rod. Similarly, when the second adjustment bolt threadedly cooperates with the second adjustment column to press the transformer base, downward pressure is applied to the caliper, and relying on the principle of leverage, an upward force is applied to the lifting ring at the other end, and because the lifting ring is fixedly connected to the pull rod, the upward force makes the connection between the two more secure, thereby firmly fixing the ladder beam of the safety ladder.

[0010] Preferably, the third fixing structure includes an insulating clamp provided at the rear side of the top of the safety ladder, the insulating clamp having a groove matching the outer wall surface of the top of the casing, and the outer wall surface of the top of the casing abuts against the groove. The insulating clamp is made of insulating material, and the outer wall surface of the top of the casing will not be damaged when it abuts against the groove.

[0011] Preferably, the third fixing structure further comprises a first safety belt sleeved on the top of the casing and opposite to the insulating clamp, and at least one end of the first safety belt is fixedly connected to the safety ladder through a first tensioner. By sleeved the first safety belt on the top of the casing, the connection between the safety ladder and the casing is strengthened, and at the same time, the first tensioner can better adjust the tightness of the connection between the first safety belt and the casing.

[0012] Preferably, two second safety belts are provided between the middle of the safety ladder and the two clamps, and at least one end of each of the second safety belts is provided with a second tensioner. By providing the second safety belt, an additional safety guarantee is provided on the basis of the connection between the two pull rods. The fixing position of the second safety belt and the safety ladder is different from that of the pull rod. Especially when the length of the safety ladder is relatively long, the provision of the second safety belt increases the fixing point between the safety ladder and the transformer base, thereby making the safety ladder more firmly fixed.

[0013] Preferably, the foldable work platform comprises a horizontal support rod group, an inclined telescopic support rod group, and a stepping platform arranged on the horizontal support rod group, one end of the horizontal support rod group is rotatably connected to the safety ladder, the other end of the horizontal support rod group is rotatably connected to the bottom end of the inclined telescopic support rod group, and the other end of the inclined telescopic support rod group is detachably fixed to the pedal above the safety ladder. After use or after use, the foldable work platform can be supported or stored by hanging the other end of the inclined telescopic support rod group on a different pedal, for example, the other end of the inclined telescopic support rod group is hung at a low position so that an angle is formed between the inclined telescopic support rod group and the horizontal support rod group, that is, the work platform is supported, and when the other end of the inclined telescopic support rod group is hung on a higher pedal or removed, the inclined telescopic support rod group and the horizontal support rod group are rotated to be in a straight line, so that the work platform can be supported and stored.

[0014] Preferably, the horizontal support rod group includes two horizontal support rods, the ends of the two horizontal support rods are rotatably connected to a crossbar of the safety ladder, and the tilt telescopic support group includes two tilt telescopic support rods, the ends of the two tilt telescopic support rods are gripped on the pedal of the safety ladder. By adjusting the length of the tilt telescopic support rods, the angle of the stepping platform can be adjusted, and the maximum adjustment angle of the stepping platform is 70°.

[0015] The embodiment of the present application also provides a method for installing a transformer bushing maintenance auxiliary tool, comprising the following steps:

[0016] S1. Place the safety ladder of the transformer bushing maintenance auxiliary tool against the bushing, so that the insulating clamp at the top of the safety ladder is against the top of the bushing, respectively sleeve the two clamps at the two ends of the bottom of the safety ladder, respectively clamp the openings of the two clamps on the bottom of the transformer base, and screw the first adjustment bolt into the first adjustment column to press the transformer base;

[0017] S2, clamp the two calipers at the rear bottom of the transformer base respectively, and fix one end of the two pull rods to the lifting rings of the two calipers, screw the second adjustment bolt into the second adjustment column and press the transformer base;

[0018] S3, grasping and fixing the two inclined telescopic support rods of the foldable working platform on the pedal of the safety ladder, and adjusting the length of the two telescopic support rods to adjust the angle of the stepping platform;

[0019] S4. Sleeve the first safety belt at the top of the safety ladder onto the top of the casing, and use the first tensioner to adjust the tightness of the first safety belt.

[0020] Implementing the embodiments of the present application has the following beneficial effects:

[0021] In the scheme of the present application, the safety ladder has a simple structure, is easy to carry, and is quick to install. The operator climbs the transformer bushing base and reaches the bushing through the safety ladder without contacting the bushing to avoid damaging the bushing. It is suitable for bushings from different manufacturers, and the working platform can be folded for easy transportation and handling, improving labor efficiency and ensuring personal and equipment safety. When conducting transformer bushing maintenance tests, there is no need to climb the bushing directly, and the toes do not need to be inserted into the gap of the bushing porcelain skirt for high-altitude operations, thereby avoiding personal injury and safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 paying creative work.

[0023] in:

[0024] Figure 1 A schematic diagram of the structure of a transformer bushing maintenance auxiliary tool in one embodiment Figure 1 ;

[0025] Figure 2 A side view of a transformer bushing maintenance auxiliary tool according to an embodiment;

[0026] Figure 3 It is a structural schematic diagram of a transformer bushing maintenance auxiliary tool in one embodiment;

[0027] 10-safety ladder; 11-ladder beam; 12-pedal; 13-crossbar;

[0028] 20-foldable working platform; 21-horizontal support rod group; 22-tilt telescopic support rod group; 23-pedal platform;

[0029] 30- Transformer base;

[0030] 40- casing;

[0031] 50-base clamp; 51-base clamp body; 52-insertion portion; 53-first adjustment column; 54-first adjustment bolt; 55-support platform;

[0032] 60-caliper; 61-caliper body; 62-lifting ring; 63-second adjustment column; 64-second adjustment bolt;

[0033] 70-tie rod;

[0034] 80-insulating clamp; 81-groove; 82-bracket; 83-first fixing plate; 84-second fixing plate; 85-first tensioner;

[0035] 90 - second safety belt; 91 - second tensioner. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] It should be understood that the term “and / or” used in the specification and appended claims of this application refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0040] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0041] Reference Figure 1 , Figure 2 , an auxiliary tool for transformer bushing maintenance provided by an embodiment of the present application includes a safety ladder 10, a foldable work platform 20 arranged on the safety ladder 10, and a first fixing structure, a second fixing structure and a third fixing structure for fixing the safety ladder 10. The first fixing structure, the second fixing structure and the third fixing structure fix the safety ladder 10 to the transformer base 30 from the bottom, the rear and the top respectively. Specifically, the first fixing structure is arranged at the bottom of the safety ladder 10 to fix the safety ladder 10 to the transformer base 30, the second fixing structure is arranged in the middle of the safety ladder 10 and tightens the safety ladder 10 backwards and fixes it to the transformer base 30, and the third fixing structure is arranged at the rear side of the top of the safety ladder 10 to fix it to the top of the transformer base 30.

[0042] In the embodiment of the present application, the safety ladder 10 has a simple structure, is easy to carry, and is quick to install. The operator climbs the transformer bushing base and reaches the bushing 40 through the safety ladder 10 without contacting the bushing 40 to avoid damaging the bushing 40. The safety ladder 10 is suitable for bushings 40 of different manufacturers, and the working platform can be folded for easy transportation and handling, improving labor efficiency and ensuring personal equipment safety. When performing a maintenance test on the transformer bushing 40, there is no need to climb the bushing 40 directly, and the toes do not need to be inserted into the gap of the porcelain skirt of the bushing 40 for climbing work, thereby avoiding personal injury and safety accidents.

[0043] In this embodiment, the first fixing structure, the second fixing structure and the third fixing structure cooperate with each other to fix the safety ladder 10. Of course, in other embodiments, each fixing structure can also cooperate with other structures to fix the safety ladder 10. As long as the safety ladder 10 is firmly and effectively fixed on the transformer base 30, it is within the protection scope of this application. The following is a detailed description of each part of the structure in conjunction with the accompanying drawings.

[0044] In this embodiment, the safety ladder 10 is made of insulating material, which provides safety for on-site operations on the one hand, and is light and easy to carry on the other hand. Specifically, the safety ladder 10 is made of epoxy resin, which has good corrosion resistance and a density of only 1 / 4 of steel, but has an absolute strength that exceeds that of steel. Moreover, the cured epoxy resin also has excellent insulation performance, and the pure porcelain bushing 40 will not be damaged when it is inspected.

[0045] In this embodiment, the safety ladder 10 includes two ladder beams 11 arranged in parallel and a plurality of pedals 12 evenly spaced between the two ladder beams 11. The ladder beam 11 has a quadrilateral cross section with a cavity inside. Similarly, the pedals 12 also have a quadrilateral cross section to increase the contact area and facilitate supporting the operator when climbing.

[0046] The transformer bushing 40 is fixed on the transformer base 30 and extends upward to a certain height. Therefore, when the safety ladder 10 is installed, it is fixed on the transformer base 30 through the first fixing structure, the second fixing structure and the third fixing structure.

[0047] In this embodiment, the first fixing structure includes two clamps 50, and the two clamps 50 are respectively fixed to the two ends of the bottom of the safety ladder 10. Specifically, the two clamps 50 are respectively fixed to the bottom ladder feet of the two ladder beams 11. Since the ladder beams 11 play a major supporting role for the entire safety ladder 10, the bottoms of the two ladder beams 11 are fixed by the two clamps 50, which also realizes the main fixation of the safety ladder 10. In this embodiment, the two clamps 50 are detachable, which is convenient for quick disassembly and installation of the safety ladder 10, and is particularly suitable for on-site operations.

[0048] Specifically, refer to Figure 3 The seat clamp 50 includes a seat clamp body 51 in a C shape, a plug-in portion 52 disposed at the top of the seat clamp body 51 and close to the open end, a first adjustment column 53 disposed at the top of the seat clamp body 51 and passing through, and a first adjustment bolt 54 threadedly locked with the first adjustment column 53. Since the ladder beam 11 has a square cross section and a cavity inside, when the safety ladder 10 is installed through the seat clamp 50, the plug-in portion 52 is inserted into the cavity in the ladder foot at the bottom of the ladder beam 11, that is, the ladder beam 11 of the safety ladder 10 is sleeved on the seat clamp 50. At the same time, the C-shaped opening of the seat clamp 50 is clamped on the transformer base 30, the first adjustment column 53 is provided with an internal thread (not shown in the figure), and the first adjustment bolt 54 has an external thread. The first adjustment bolt 54 is inserted into the first adjustment column 53 and screwed along the through hole to press the transformer base 30, thereby firmly fixing the seat clamp 50 on the transformer base 30. A handle 541 is horizontally passed through the first adjustment bolt 54 to facilitate the screwing of the first adjustment bolt 54.

[0049] In this embodiment, the plug-in portion 52 is located at one end of the top surface of the seat clamp body 51, and the first adjusting column 53 is arranged near the other end. When the plug-in portion 52 is inserted into the bottom of the ladder beam 11, a fulcrum is formed at the plug-in point. When the first adjusting bolt 54 and the first adjusting column 53 are threadedly engaged to press the transformer base 30, downward pressure is applied to the seat clamp 50. Relying on the principle of leverage, the plug-in portion 52 at the other end is applied with an upward force. Since the plug-in portion 52 is inserted into the cavity at the bottom of the ladder beam 11, the upward force makes the connection between the two more secure, thereby firmly fixing the ladder beam 11.

[0050] In this embodiment, the plug-in portion 52 is rod-shaped, so that it is convenient to insert it into the bottom of the ladder beam 11 of the safety ladder 10. Of course, the plug-in portion 52 can also be other shapes, such as also being compatible with the cross section of the ladder beam 11.

[0051] In this embodiment, the C-shaped structure of the seat clamp body 51 can be integrally formed or spliced, and a support platform 55 is also provided on its top wall. The size and shape of the support platform 55 are adapted to the cross-section of the ladder beam 11 of the safety ladder 10. When the plug-in portion 52 is inserted into the cavity of the ladder beam 11, the bottom ladder foot of the ladder beam 11 is placed on the support platform 55, which provides good support for the ladder foot.

[0052] Furthermore, in this embodiment, groove teeth (not shown in the figure) are also provided on the inner wall of the C-shaped opening of the seat clamp body 51, and the cross-sectional shape of the groove teeth is V-shaped. In this way, the inner wall of the C-shaped opening contacts the top and bottom surfaces of the transformer base 30 through the groove teeth, thereby reducing the contact area and increasing the friction between the seat clamp 50 and the transformer base 30, thereby making the safety ladder 10 more securely fixed.

[0053] In this embodiment, the second fixing structure includes two clamps 60, which are arranged on the back of the transformer base 30, that is, on the back of the bushing 40. The two clamps 60 tighten and fix the safety ladder 10 from the rear end through an inclined pull rod 70. In this way, the safety ladder 10 is fixed from the front by the two clamps 50 and then fixed from the back by the two clamps 60, so that the safety ladder 10 is fixed more comprehensively and firmly.

[0054] In the embodiment of the present application, one end of the pull rod 70 connected to the safety ladder 10 is a detachable structure, and the pull rod 70 is retractable. The tightness of the connection between the pull rod 70 and the safety ladder 10 can be adjusted by adjusting the length of the pull rod 70 and the connection position of the pull rod 70 and the safety ladder 10, thereby better fixing the safety ladder 10.

[0055] The structure of the caliper 60 is slightly different from that of the seat caliper 50. Its clamping function is the same as that of the seat caliper 50. The difference is that since the caliper 60 is connected to the pull rod 70, the plug-in portion 52 is not provided on the caliper 60, but a hanging ring 62 is provided on the top.

[0056] Specifically, the caliper 60 includes a C-shaped caliper body 61, a lifting ring 62 disposed at the top of the caliper body 61 and close to the open end, a second adjustment column 63 disposed at the top of the seat caliper body 51 and passing through, and a second adjustment bolt 64 threadedly locked with the second adjustment column 63, and the opening of the caliper body 61 is clamped on the transformer base 30 on the transformer base 30. Similarly, the second adjustment column 63 is provided with an internal thread, and the second adjustment bolt 64 has an external thread. The second adjustment bolt 64 extends into the second adjustment column 63 and is screwed along the through hole to press the transformer base 30, thereby firmly fixing the seat caliper 50 on the transformer base 30. A handle is horizontally passed through the second adjustment bolt 64 to facilitate the screwing of the second adjustment bolt 64. Similarly, when the second adjusting bolt 64 and the second adjusting column 63 are threadedly matched to press the transformer base 30, downward pressure is applied to the caliper 60. Relying on the lever principle, an upward force is applied to the lifting ring 62 at the other end. Since the lifting ring 62 is fixedly connected to the pull rod 70, the upward force makes the connection between the two more secure, thereby firmly fixing the ladder beam 11 of the safety ladder 10.

[0057] Similarly, in this embodiment, groove teeth (not shown in the figure) are also provided on the inner wall of the C-shaped opening of the caliper body 61, and the cross-sectional shape of the groove teeth is V-shaped. In this way, the inner wall of the C-shaped opening contacts the top and bottom surfaces of the transformer base 30 through the groove teeth, thereby reducing the contact area and increasing the friction between the caliper 60 and the transformer base 30, thereby making the safety ladder 10 more securely fixed.

[0058] In this embodiment, the third fixing structure includes an insulating clamp 80 disposed at the rear side of the top of the safety ladder 10. The insulating clamp 80 has a groove 81 matching the outer wall surface of the top of the sleeve 40, and the outer wall surface of the top of the sleeve 40 is close to the groove 81. The insulating clamp 80 is made of polyurethane material, which not only ensures its insulation performance, but also is relatively soft, and the outer wall surface of the top of the sleeve 40 will not be damaged when it is close to the groove 81. Of course, in other embodiments, other insulating materials can also be used.

[0059] In this embodiment, the insulating clamp 80 is in the shape of a long block as a whole, and is provided with a hollow hole, and a groove 81 is provided on a side of the insulating clamp 80 close to the sleeve 40. The hollow hole is provided to reduce the weight of the insulating clamp 80, thereby reducing the weight of the entire safety ladder 10, and facilitating transportation. On the other hand, the hollow hole also enhances the elasticity of the insulating clamp 80. When the sleeve 40 collides with the insulating clamp 80, or the insulating clamp 80 is pressed against the sleeve 40, it can play a buffering role to avoid damage to the sleeve 40. Especially when the sleeve 40 is a pure porcelain sleeve 40, this protective role is more necessary.

[0060] The insulating clamp 80 is fixedly connected to the safety ladder 10 through a bracket 82. Specifically, the bracket 82 includes a first fixing plate 83 installed on the back of the two ladder beams 11 and parallel to the pedal 12, and two second fixing plates 84 located at both ends of the first fixing plate 83 and fixed on the two ladder beams 11. The insulating clamp 80 is fixed on the first fixing plate 83 and clamped between the two second fixing plates 84. With such a structure, the insulating clamp 80 can be well fixed and supported.

[0061] In this embodiment, the third mounting structure further includes a first safety belt (not shown) sleeved on the top of the sleeve 40 and opposite to the insulating clamp 80, and at least one end of the first safety belt is fixedly connected to the safety ladder 10 through a first tensioner 85. By sleeved the first safety belt on the top of the sleeve 40, the connection between the safety ladder 10 and the sleeve 40 is strengthened. At the same time, the length of the first safety belt can be adjusted by the first tensioner 85, so that the tightness of the connection between the first safety belt and the sleeve 40 can be better adjusted.

[0062] Furthermore, in this embodiment, in order to strengthen the connection between the safety ladder 10 and the transformer base 30, two second safety belts 90 are provided between the middle of the safety ladder 10 and the two clamps 60, and at least one end of each second safety belt 90 is provided with a second tensioner 91. By providing the second safety belt 90, an additional safety guarantee is provided on the basis of the connection between the two pull rods 70. The fixing position of the second safety belt 90 and the safety ladder 10 is different from that of the pull rod 70. Especially when the length of the safety ladder 10 is relatively high, the provision of the second safety belt 90 increases the fixing point between the safety ladder 10 and the transformer base 30, thereby making the fixing of the safety ladder 10 more secure.

[0063] In this embodiment, the bottom end of the second safety belt 90 is also fixed to the lifting ring 62 of the caliper 60. Of course, it can also be fixed to other positions on the caliper body 61, or directly set a mounting position on the transformer base 30 to fix the bottom end of the second safety belt 90, and the top end of the second safety belt 90 is fixed to the ladder beam 11 of the safety ladder 10. At the same time, the length of the second safety belt 90 is adjusted by the second tensioner 91, so that the tightness of the connection between the second safety belt 90 and the transformer base 30 can be better adjusted.

[0064] In this embodiment, a foldable work platform 20 is provided on the safety ladder 10 to facilitate workers to stand and work. At the same time, the work platform can be folded to facilitate the storage and transportation of the safety ladder 10. Specifically, the foldable work platform 20 includes a horizontal support rod group 21, an inclined telescopic support rod group 22, and a stepping platform 23 provided on the horizontal support rod group 21. One end of the horizontal support rod group 21 is rotatably connected to the safety ladder 10, and the other end of the horizontal support rod group 21 is rotatably connected to the bottom end of the inclined telescopic support rod group 22. The other end of the inclined telescopic support rod group 22 is detachably fixed to the pedal 12 on the safety ladder 10. After use or completion of use, the foldable work platform 20 can be supported or stored by hanging the other end of the tiltable telescopic support rod group 22 on a different pedal 12. For example, the other end of the tiltable telescopic support rod group 22 is hung at a low position so that an angle is formed between the tiltable telescopic support rod group 22 and the horizontal support rod group 21, thereby supporting the work platform. When the other end of the tiltable telescopic support rod group 22 is hung on a higher pedal 12 or is removed, the tiltable telescopic support rod group 22 and the horizontal support rod group 21 are rotated to be in a straight line, thereby supporting and storing the work platform.

[0065] Further, the horizontal support rod group 21 includes two horizontal support rods, the ends of the two horizontal support rods are rotatably connected to a crossbar 13 of the safety ladder 10, and the crossbar 13 is horizontally and rotatably arranged between the two ladder beams 11. The tilting telescopic support group 22 includes two tilting telescopic support rods, and the ends of the two tilting telescopic support rods are gripped on the pedal 12 of the safety ladder 10. In this embodiment, the angle of the stepping platform 23 can be adjusted by adjusting the length of the tilting telescopic support rod, and the maximum adjustment angle of the stepping platform 23 is 70°.

[0066] In this embodiment, the installation method of the transformer bushing 40 maintenance auxiliary tool described above includes the following steps:

[0067] S1. Place the safety ladder 10 of the transformer bushing 40 maintenance auxiliary tool against the bushing 40, so that the insulating clamp 80 at the top of the safety ladder 10 is against the top of the bushing 40, respectively sleeve the two clamps 50 at the two ends of the bottom of the safety ladder 10, clamp the openings of the two clamps 50 on the transformer base 30, and screw the first adjustment bolt 54 into the first adjustment column 53 to press the transformer base 30;

[0068] S2, clamp the two calipers 60 at the rear bottom of the transformer base 30 respectively, and fix one end of the two pull rods 70 to the lifting rings 62 of the two calipers 60, screw the second adjustment bolt 64 into the second adjustment column 63 and press the transformer base 30;

[0069] S3, grasp and fix the two inclined telescopic support rods of the foldable working platform 20 on the pedal 12 of the safety ladder 10, and adjust the length of the two telescopic support rods to adjust the angle of the stepping platform 23;

[0070] S4. Sleeve the first safety belt at the top of the safety ladder 10 onto the top of the sleeve 40, and use the first tensioner 85 to adjust the tightness of the first safety belt.

[0071] The auxiliary tool in the embodiment of the present application is used to inspect and repair the casing 40, which is simple to operate and easy to install, greatly facilitating on-site operations.

[0072] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A transformer bushing maintenance auxiliary tool, characterized in that: The utility model comprises a safety ladder, a first fixing structure arranged at the bottom of the safety ladder for fixing the safety ladder to the transformer base, a second fixing structure arranged at the middle of the safety ladder for pulling the safety ladder backwards and fixing it to the transformer base, and a third fixing structure arranged at the rear side of the top of the safety ladder for fixing it to the top of the bushing. A foldable working platform is provided on the safety ladder.

2. The transformer bushing maintenance auxiliary tool according to claim 1, characterized in that: The first fixing structure includes two seat clamps, which are respectively fixed at the two ends of the bottom of the safety ladder, each seat clamp includes a C-shaped seat clamp body, a plug-in portion arranged at the top of the seat clamp body and close to the open end, a first adjustment column arranged at the top of the seat clamp body and passing through, and a first adjustment bolt threadedly locked with the first adjustment column, the plug-in portion extends into the bottom of the safety ladder, the opening of the seat clamp body is clamped on the transformer base, and the first adjustment bolt extends into the first adjustment column and presses the transformer base.

3. The transformer bushing maintenance auxiliary tool according to claim 2, characterized in that: The second fixing structure comprises two clamps, which are arranged on the back of the transformer base and tighten and fix the safety ladder from the rear end through an inclined pull rod.

4. The transformer bushing maintenance auxiliary tool according to claim 3, characterized in that: The caliper includes a C-shaped caliper body, a lifting ring arranged at the top of the caliper body and close to the open end, a second adjustment column arranged at the top of the caliper body and passing through, and a second adjustment bolt threadedly locked with the second adjustment column. The opening clamp of the caliper body is arranged on the transformer base, the second adjustment bolt extends into the second adjustment column and presses the transformer base, and the lifting ring is fixedly connected to one end of the pull rod.

5. The transformer bushing maintenance auxiliary tool according to claim 1, characterized in that: The third fixing structure includes an insulating clamp arranged at the rear side of the top of the safety ladder, and the insulating clamp has a groove matching the outer wall surface of the top of the sleeve, and the outer wall surface of the top of the sleeve is abutted against the groove.

6. The transformer bushing maintenance auxiliary tool according to claim 5, characterized in that: The third fixing structure also includes a first safety belt which is sleeved on the top of the sleeve and opposite to the insulating clamp, and at least one end of the first safety belt is fixedly connected to the safety ladder through a first tensioner.

7. The transformer bushing maintenance auxiliary tool according to claim 3, characterized in that: Two second safety belts are also arranged between the middle part of the safety ladder and the two clamps, and at least one end of each of the second safety belts is provided with a second tensioner.

8. The transformer bushing maintenance auxiliary tool according to any one of claims 2 to 7, characterized in that: The foldable working platform includes a horizontal support rod group, an inclined telescopic support rod group, and a stepping platform arranged on the horizontal support rod group. One end of the horizontal support rod group is rotatably connected to the safety ladder, and the other end of the horizontal support rod group is rotatably connected to the bottom end of the inclined telescopic support rod group. The other end of the inclined telescopic support rod group can be detachably fixed to the pedal above the safety ladder.

9. The transformer bushing maintenance auxiliary tool according to claim 8, characterized in that: The horizontal support rod group includes two horizontal support rods, the ends of the two horizontal support rods are rotatably connected to a crossbar of the safety ladder, and the inclined telescopic support group includes two inclined telescopic support rods, the ends of the two inclined telescopic support rods are gripped on the pedals of the safety ladder.

10. The method for installing the transformer bushing maintenance auxiliary tool according to claim 9, characterized in that: The following steps are involved: S1. Place the safety ladder of the transformer bushing maintenance auxiliary tool against the bushing, so that the insulating clamp at the top of the safety ladder is against the top of the bushing, respectively sleeve the two base clamps at the two ends of the bottom of the safety ladder, respectively clamp the openings of the two base clamps on the transformer base, and screw the first adjustment bolt into the first adjustment column to press the transformer base; S2, clamp the two calipers at the rear bottom of the transformer base respectively, and fix one end of the two pull rods to the lifting rings of the two calipers, screw the second adjustment bolt into the second adjustment column and press the transformer base; S3, grasping and fixing the two inclined telescopic support rods of the foldable working platform on the pedal of the safety ladder, and adjusting the length of the two telescopic support rods to adjust the angle of the stepping platform; S4. Sleeve the first safety belt at the top of the safety ladder onto the top of the casing, and use the first tensioner to adjust the tightness of the first safety belt.

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