Telescopic transformer maintenance stair

Abstract

The utility model provides a telescopic transformer maintenance stair, and belongs to the technical field of maintenance stairs. The telescopic transformer maintenance stair comprises a control assembly, a telescopic ladder assembly is arranged on one side of the control assembly, the control assembly comprises a mounting base, a motor box is fixedly mounted at the bottom of the mounting base, a control groove is formed in one side of the motor box, and an indicator lamp and a control button are arranged in the control groove. A lock catch is fixedly mounted at the bottom of the inner side of the control groove, a protective cover is hinged to the top of the control groove, a catching groove is formed in the middle of the bottom end of the protective cover, a lock body is fixedly mounted at the bottom of the protective cover, a sliding groove is formed in one side of the mounting base, and a sliding block is slidably connected into the sliding groove. According to the climbing ladder, the situation that a non-professional person starts the climbing ladder to climb can be effectively avoided, safety accidents are avoided, and the climbing ladder has high practical value.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance stairs, in particular to a retractable transformer maintenance staircase. Background Art

[0002] Recently, the transformers in the steel plant need regular inspection and maintenance. The transformers are at a certain height from the ground. The transformer inspection stairs are important facilities to ensure the smooth maintenance and inspection of the transformers. Maintenance personnel need to climb to the transformers through the inspection stairs to inspect them.

[0003] Based on the above, the inventors have found the following problems: the current maintenance stairs are generally simple welded stairs, which are welded and fixed, and non-professionals can also climb them, which poses a safety hazard and is inconvenient to use.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a retractable transformer maintenance staircase is provided to achieve a purpose with greater practical value. Utility Model Content

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a retractable transformer maintenance staircase, which is specifically implemented through the following technical solutions:

[0006] A retractable transformer maintenance staircase comprises a control component, a telescopic ladder component is arranged on one side of the control component, the control component comprises a mounting seat, a motor box is fixedly mounted on the bottom of the mounting seat, a control slot is arranged on one side of the motor box, an indicator light and a control button are arranged inside the control slot, a lock buckle is fixedly mounted on the bottom of the inner side of the control slot, a protective cover is hinged on the top of the control slot, a buckle slot is arranged in the middle of the bottom end of the protective cover, a lock body is fixedly mounted on the bottom of the protective cover, a sliding slot is arranged on one side of the mounting seat, a sliding block is slidably connected inside the sliding slot, the top of the sliding block is fixedly connected to the bottom end of the telescopic ladder component, a top cover is fixedly mounted on the top of the mounting seat, a mounting frame is fixedly mounted on one side of the top cover, and the top of the mounting frame is fixedly connected to the top end of the telescopic ladder component.

[0007] The beneficial effect of adopting the above further scheme is that an indicator light and a control button are arranged inside the control groove, so it is convenient to use the control button to control the device to work, and the indicator light displays the working status of the device; a protective cover is hinged on the top of the control groove, and a buckle groove is opened in the middle of the bottom end of the protective cover, so that the protective cover can protect the internal control buttons and indicator lights; a lock body is fixedly installed at the bottom of the protective cover, so that the protective cover and the control groove are locked, so that the protective cover can only be opened by the staff using a special key, which can effectively prevent non-professionals from opening the device to climb and avoid safety accidents; the top of the sliding block is fixedly connected to the bottom end of the telescopic ladder assembly, so that the sliding block can slide up and down to control the expansion and contraction of the telescopic ladder assembly; a mounting frame is fixedly installed on one side of the top cover, and the top of the mounting frame is fixedly connected to the top of the telescopic ladder assembly, so that the top of the telescopic ladder assembly can be fixed to the top of the control assembly, so that when the telescopic ladder assembly is contracted, it can be fixed to the top side of the mounting seat, which can effectively prevent non-staff from touching the telescopic ladder assembly and avoid safety accidents.

[0008] Furthermore, a threaded rod is threadedly connected to the middle portion of one end of the sliding block, and the threaded rod is rotatably connected to the mounting seat.

[0009] The beneficial effect of adopting the above further solution is that a threaded rod is threadedly connected to the middle part of one end of the sliding block, and the threaded rod is rotatably connected to the mounting seat, which facilitates the rotation of the threaded rod and controls the sliding block to slide up and down along the sliding groove.

[0010] Furthermore, a lifting motor is fixedly installed inside the motor box, and a worm is fixedly installed at the output end of the lifting motor.

[0011] The beneficial effect of adopting the above further solution is that a lifting motor is fixedly installed inside the motor box, and a worm is fixedly installed at the output end of the lifting motor, so that the lifting motor can drive the worm to rotate when it works.

[0012] Furthermore, the worm is meshingly connected with a worm wheel, and the worm wheel is fixedly connected to the threaded rod.

[0013] The beneficial effect of adopting the above further solution is that the worm is meshedly connected with the worm wheel, and the worm wheel is fixedly connected to the threaded rod, so that the rotation of the worm drives the rotation of the worm wheel, thereby driving the rotation of the threaded rod.

[0014] Furthermore, a plurality of mounting ears are fixedly mounted on both sides of the mounting seat, and the mounting ears are arranged at equal distances.

[0015] The beneficial effect of adopting the above further solution is that a plurality of mounting ears are fixedly mounted on both sides of the mounting base, and the mounting ears are arranged equidistantly, so as to facilitate fixed connection between the device and the building wall at the bottom of the transformer.

[0016] Furthermore, the telescopic ladder assembly includes a plurality of lifting pedals, both ends of the lifting pedals are provided with fixing rings, a telescopic tube is fixedly installed inside the fixing ring, and a protective ring is fixedly installed on one side of the two fixing rings.

[0017] The beneficial effect of adopting the above further solution is that a protective ring is fixedly installed on one side of the two fixing rings, so as to provide a certain protection effect when the staff is climbing and reduce the risk of the staff falling.

[0018] Furthermore, the top end of the telescopic tube is sleeved on the outside of the adjacent telescopic tube, and the bottom end of the telescopic tube is inserted and arranged on the inside of the adjacent telescopic tube.

[0019] The beneficial effect of adopting the above further scheme is that the top end of the telescopic tube is sleeved on the outside of the adjacent telescopic tube, and the bottom end of the telescopic tube is inserted and arranged on the inside of the adjacent telescopic tube, so that the telescopic ladder assembly can be telescopic and the overall length of the telescopic ladder assembly can be adjusted.

[0020] Furthermore, a first limiting ring is fixedly installed on the inner side of the top end of the telescopic tube, and a second limiting ring is fixedly installed on the outer side of the top end of the telescopic tube.

[0021] The beneficial effect of adopting the above further solution is that the first limiting ring is fixedly installed on the inner side of the top end of the telescopic tube, and the second limiting ring is fixedly installed on the outer side of the top end of the telescopic tube, so as to prevent the telescopic tube from slipping out of the adjacent telescopic tube.

[0022] Furthermore, an anti-sliding block is fixedly installed in the middle of the top of the lifting pedal, the bottom of the lifting pedal arranged at the top of the telescopic ladder assembly is fixedly connected to the mounting frame, and the bottom of the lifting pedal arranged at the bottom of the telescopic ladder assembly is fixedly connected to the sliding block.

[0023] Furthermore, a support tube is fixedly installed at the bottom of the telescopic tube arranged at the lowest end of the telescopic ladder assembly, a fixed pedal is fixedly installed between the two support tubes, and a support foot is fixedly installed at the bottom of the support tube.

[0024] The beneficial effect of adopting the above further scheme is that a fixed pedal is fixedly installed between the two support tubes, and a support foot is fixedly installed at the bottom of the support tube, which makes it convenient for workers to climb up to the lifting pedal through the fixed pedal, and the support foot provides support at the bottom of the telescopic ladder assembly.

[0025] The beneficial effects of the utility model are as follows: the utility model obtains a retractable transformer maintenance staircase through the above design, the retractable transformer maintenance staircase, an indicator light and a control button are arranged inside the control slot, it is convenient to use the control button to control the device to work, the indicator light displays the working status of the device, a protective cover is hinged at the top of the control slot, a buckle slot is opened in the middle of the bottom end of the protective cover, it is convenient for the protective cover to protect the internal control button and the indicator light, a lock body is fixedly installed at the bottom of the protective cover, it is convenient to lock the closure of the protective cover and the control slot, so that the opening of the protective cover can only be opened by the staff using a special key, it can effectively prevent non-professionals from opening the device to climb, and avoid safety accidents, the top of the sliding block is fixedly connected to the bottom end of the telescopic ladder assembly, it is convenient to slide the sliding block up and down to control the expansion and contraction of the telescopic ladder assembly, a mounting frame is fixedly installed on one side of the top cover, the top of the mounting frame is fixedly connected to the top of the telescopic ladder assembly, it is convenient to fix the top of the telescopic ladder assembly with the top of the control assembly, so that when the telescopic ladder assembly is retracted, it can be fixed to one side of the top of the mounting seat, it can effectively prevent non-staff from touching the telescopic ladder assembly, and avoid safety accidents, and it has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A three-dimensional structural schematic diagram of a retractable transformer maintenance staircase provided by the utility model;

[0028] Figure 2 An exploded view of a retractable transformer maintenance staircase provided by the utility model;

[0029] Figure 3 A partial three-dimensional structural diagram of the control assembly provided by the utility model;

[0030] Figure 4 A three-dimensional structural diagram of the interior of the motor box provided by the utility model;

[0031] Figure 5 The present invention is a three-dimensional structural schematic diagram of a lifting pedal provided by the utility model.

[0032] In the figure: 101, control assembly; 10101, mounting base; 10102, motor box; 10103, control slot; 10104, lock buckle; 10105, indicator light; 10106, control button; 10107, protective cover; 10108, lock body; 10109, buckle slot; 10110, mounting ear; 10111, sliding slot; 10112, sliding block; 10113, threaded rod; 10114, top cover; 10115, locking plate; 10116, locking plate; 10117, locking plate; 10118, locking plate; 10119, locking plate; 1020, locking plate; 10210, locking plate; 10221, locking plate; 1023, locking plate; 1024, locking plate; 1025, locking plate; 1026, locking plate; 1027, locking plate; 1028, locking plate; 1029, locking plate; 1030, locking plate; 1031, locking plate; 1032, locking plate; 1033, locking plate; 1034, locking plate; 1035, locking plate; 1036, locking plate; 1037, locking plate; 1038, locking plate; 1039, locking plate; 1040, locking plate; 1041, locking plate; 1042, locking plate; 1043, locking plate; 1044, locking plate; 1045, locking plate; 1046, locking plate; 1047, locking plate; 1048, locking plate; 1049, locking plate; 1050, locking plate; 1051, locking plate; 1052, locking plate; 1053, locking 115. Mounting frame; 10116. Lifting motor; 10117. Worm; 10118. Worm wheel; 102. Telescopic ladder assembly; 10201. Lifting pedal; 10202. Fixing ring; 10203. Telescopic tube; 10204. First limiting ring; 10205. Second limiting ring; 10206. Anti-sliding block; 10207. Support foot; 10208. Protective ring; 10209. Support tube; 10210. Fixed pedal. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1 of the utility model of a retractable transformer maintenance ladder

[0036] The utility model provides the following technical solutions: Figure 1-Figure 5As shown, a retractable transformer maintenance ladder comprises a control component 101, a retractable ladder component 102 is arranged on one side of the control component 101, the control component 101 comprises a mounting seat 10101, a motor box 10102 is fixedly mounted on the bottom of the mounting seat 10101, a control slot 10103 is opened on one side of the motor box 10102, an indicator light 10105 and a control button 10106 are arranged inside the control slot 10103, the indicator light 10105 and the control button 10106 are arranged inside the control slot 10103, the control button 10106 is convenient to control the device to work, and the indicator light 10105 shows the working state of the device In the state, a lock buckle 10104 is fixedly installed at the bottom of the inner side of the control slot 10103, a protective cover 10107 is hinged at the top of the control slot 10103, and a buckle slot 10109 is opened in the middle of the bottom end of the protective cover 10107. The protective cover 10107 is hinged at the top of the control slot 10103, and a buckle slot 10109 is opened in the middle of the bottom end of the protective cover 10107, so that the protective cover 10107 can protect the internal control button 10106 and the indicator light 10105. A lock body 10108 is fixedly installed at the bottom of the protective cover 10107, and the lock body 10108 is fixedly installed at the bottom of the protective cover 10107, so that the protective cover 10107 can be easily opened. 107 is locked with the closure of the control slot 10103, so that the protective cover 10107 can only be opened by the staff using a special key, which can effectively prevent non-professionals from climbing to open the device and avoid safety accidents. A sliding slot 10111 is provided on one side of the mounting seat 10101, and a sliding block 10112 is slidably connected inside the sliding slot 10111. The top of the sliding block 10112 is fixedly connected to the bottom end of the telescopic ladder assembly 102. The top of the sliding block 10112 is fixedly connected to the bottom end of the telescopic ladder assembly 102, so that the sliding block 10112 can slide up and down to control the expansion and contraction of the telescopic ladder assembly 102. A top cover 10114 is fixedly installed on the top of the seat 10101, and a mounting frame 10115 is fixedly installed on one side of the top cover 10114. The top of the mounting frame 10115 is fixedly connected to the top of the telescopic ladder assembly 102. The mounting frame 10115 is fixedly installed on one side of the top cover 10114, and the top of the mounting frame 10115 is fixedly connected to the top of the telescopic ladder assembly 102, so that the top of the telescopic ladder assembly 102 can be fixed to the top of the control assembly 101, so that the telescopic ladder assembly 102 can be fixed to one side of the top of the mounting seat 10101 when it is retracted, which can effectively prevent non-staff from touching the telescopic ladder assembly 102 and avoid safety accidents.

[0037] Embodiment 2 of the utility model of a retractable transformer maintenance ladder

[0038] Reference Figure 1-Figure 4As shown, a threaded rod 10113 is threadedly connected to the middle part of one end of the sliding block 10112, and the threaded rod 10113 is rotatably connected to the mounting seat 10101. The threaded rod 10113 is threadedly connected to the middle part of one end of the sliding block 10112, and the threaded rod 10113 is rotatably connected to the mounting seat 10101, which is convenient for the rotation of the threaded rod 10113, and the sliding block 10112 is controlled to slide up and down along the sliding groove 10111. A lifting motor 10116 is fixedly installed inside the motor box 10102, and a worm 10117 is fixedly installed at the output end of the lifting motor 10116. The lifting motor 10116 is fixedly installed inside the motor box 10102, and a worm 10117 is fixedly installed at the output end of the lifting motor 10116, which is convenient for lifting. The motor 10116 drives the worm 10117 to rotate when it works. The worm 10117 is meshedly connected with a worm wheel 10118. The worm wheel 10118 is fixedly connected to the threaded rod 10113. The worm 10117 is meshedly connected with the worm wheel 10118. The worm wheel 10118 is fixedly connected to the threaded rod 10113, so that the rotation of the worm 10117 drives the worm wheel 10118 to rotate, thereby driving the threaded rod 10113 to rotate. A number of mounting ears 10110 are fixedly installed on both sides of the mounting seat 10101, and the mounting ears 10110 are arranged at equal distances. A number of mounting ears 10110 are fixedly installed on both sides of the mounting seat 10101, and the mounting ears 10110 are arranged at equal distances, so that the device can be fixedly connected to the building wall at the bottom of the transformer.

[0039] Embodiment 3 of the utility model of a retractable transformer maintenance ladder

[0040] Reference Figure 1-Figure 5As shown, the telescopic ladder assembly 102 includes a plurality of lifting pedals 10201, and fixed rings 10202 are provided at both ends of the lifting pedals 10201. Telescopic tubes 10203 are fixedly installed inside the fixed rings 10202. Protective rings 10208 are fixedly installed on one side of the two fixed rings 10202. The protective rings 10208 are fixedly installed on one side of the two fixed rings 10202, so as to provide a certain protection effect when the staff members are climbing and reduce the risk of falling of the staff members. The top ends of the telescopic tubes 10203 are sleeved on the outside of the adjacent telescopic tubes 10203, and the telescopic tubes 10203 are fixedly installed on the outside of the adjacent telescopic tubes 10203. The bottom end of the tube 10203 is inserted and arranged on the inner side of the adjacent telescopic tube 10203, and the top end of the telescopic tube 10203 is sleeved on the outside of the adjacent telescopic tube 10203, and the bottom end of the telescopic tube 10203 is inserted and arranged on the inner side of the adjacent telescopic tube 10203, so that the telescopic ladder assembly 102 can play a telescopic function and adjust the overall length of the telescopic ladder assembly 102. The first limiting ring 10204 is fixedly installed on the inner side of the top end of the telescopic tube 10203, and the second limiting ring 10205 is fixedly installed on the outer side of the top end of the telescopic tube 10203. A first limiting ring 10204 is fixedly installed, and a second limiting ring 10205 is fixedly installed on the outer side of the top of the telescopic tube 10203 to prevent the telescopic tube 10203 from sliding out from the inside of the adjacent telescopic tube 10203. An anti-sliding block 10206 is fixedly installed on the middle part of the top of the lifting pedal 10201. The bottom of the lifting pedal 10201 arranged at the top of the telescopic ladder assembly 102 is fixedly connected to the mounting frame 10115, and the bottom of the lifting pedal 10201 arranged at the bottom of the telescopic ladder assembly 102 is fixedly connected to the sliding block 10112, and the lifting pedal 10201 arranged at the bottom of the telescopic ladder assembly 102 is fixedly connected to the sliding block 10112. 02 A support tube 10209 is fixedly installed at the bottom of the telescopic tube 10203 at the lowest end, a fixed pedal 10210 is fixedly installed between the two support tubes 10209, and a support foot 10207 is fixedly installed at the bottom of the support tube 10209. A fixed pedal 10210 is fixedly installed between the two support tubes 10209, and a support foot 10207 is fixedly installed at the bottom of the support tube 10209, so that the staff can climb up to the lifting pedal 10201 through the fixed pedal 10210, and the support foot 10207 can provide support at the bottom of the telescopic ladder assembly 102.

[0041] Specifically, the working principle of the retractable transformer maintenance ladder is as follows: when in use, a mounting frame 10115 is fixedly installed on one side of the top cover 10114, and the top of the mounting frame 10115 is fixedly connected to the top of the telescopic ladder assembly 102, so that the top of the telescopic ladder assembly 102 can be fixed to the top of the control assembly 101, so that when the telescopic ladder assembly 102 is retracted, it can be fixed to one side of the top of the mounting seat 10101, which can effectively prevent non-staff from touching the telescopic ladder assembly 102 and avoid safety accidents. A lifting motor 10116 is fixedly installed inside the motor box 10102, and a worm 10117 is fixedly installed on the output end of the lifting motor 10116, so that the lifting motor 10116 can drive the worm 10117 to work. The worm gear 10118 is meshed with the worm 10117, and the worm gear 10118 is fixedly connected to the threaded rod 10113, so that the rotation of the worm 10117 drives the worm gear 10118 to rotate, thereby driving the threaded rod 10113 to rotate. The threaded rod 10113 is threadedly connected to the middle part of one end of the sliding block 10112, and the threaded rod 10113 is rotatably connected to the mounting seat 10101, so as to facilitate the rotation of the threaded rod 10113, and the sliding block 10112 is controlled to slide up and down along the sliding groove 10111, and the top end of the telescopic tube 10203 is sleeved on the outside of the adjacent telescopic tube 10203, and the bottom end of the telescopic tube 10203 is inserted and arranged on the inside of the adjacent telescopic tube 10203, so that the telescopic ladder assembly 102 can be used. The telescopic function can adjust the overall length of the telescopic ladder assembly 102. A first limiting ring 10204 is fixedly installed on the inner side of the top of the telescopic tube 10203, and a second limiting ring 10205 is fixedly installed on the outer side of the top of the telescopic tube 10203 to prevent the telescopic tube 10203 from slipping out of the adjacent telescopic tube 10203. A fixed pedal 10210 is fixedly installed between two supporting tubes 10209, and a support leg 10207 is fixedly installed at the bottom of the supporting tube 10209 to facilitate the staff to climb up to the lifting pedal 10201 through the fixed pedal 10210. The support leg 10207 is convenient for providing support at the bottom of the telescopic ladder assembly 102. A protective ring 10208 is fixedly installed on one side of the two fixing rings 10202 , which is convenient for providing a certain protection effect when the staff is climbing and reducing the risk of the staff falling. An indicator light 10105 and a control button 10106 are arranged inside the control slot 10103, which is convenient for using the control button 10106 to control the device to work. The indicator light 10105 displays the working status of the device. A protective cover 10107 is hinged on the top of the control slot 10103. A buckle groove 10109 is provided in the middle of the bottom end of the protective cover 10107, which is convenient for the protective cover 10107 to protect the internal control button 10106 and the indicator light 10105. A lock body 10108 is fixedly installed at the bottom of the protective cover 10107, which is convenient for locking the protective cover 10107 and the control slot 10103.The protective cover 10107 can only be opened by the staff using a special key, which can effectively prevent non-professionals from climbing to open the device and avoid safety accidents.

[0042] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A retractable transformer maintenance staircase, characterized in that: The invention comprises a control component (101), wherein a telescopic ladder component (102) is arranged on one side of the control component (101), wherein the control component (101) comprises a mounting seat (10101), wherein a motor box (10102) is fixedly mounted on the bottom of the mounting seat (10101), wherein a control slot (10103) is opened on one side of the motor box (10102), wherein an indicator light (10105) and a control button (10106) are arranged inside the control slot (10103), wherein a lock buckle (10104) is fixedly mounted on the bottom of the inner side of the control slot (10103), wherein a protective cover (10107) is hingedly connected to the top of the control slot (10103), wherein the ... 7) A buckle groove (10109) is provided in the middle of the bottom end, a lock body (10108) is fixedly installed at the bottom of the protective cover (10107), a sliding groove (10111) is provided on one side of the mounting seat (10101), a sliding block (10112) is slidably connected inside the sliding groove (10111), the top of the sliding block (10112) is fixedly connected to the bottom end of the telescopic ladder assembly (102), a top cover (10114) is fixedly installed on the top of the mounting seat (10101), a mounting frame (10115) is fixedly installed on one side of the top cover (10114), and the top of the mounting frame (10115) is fixedly connected to the top of the telescopic ladder assembly (102).

2. The retractable transformer maintenance staircase according to claim 1, characterized in that: A threaded rod (10113) is threadedly connected to the middle portion of one end of the sliding block (10112), and the threaded rod (10113) is rotatably connected to the mounting seat (10101).

3. The retractable transformer maintenance staircase according to claim 2, characterized in that: A lifting motor (10116) is fixedly installed inside the motor box (10102), and a worm gear (10117) is fixedly installed at the output end of the lifting motor (10116).

4. The retractable transformer maintenance staircase according to claim 3 is characterized in that: The worm (10117) is meshingly connected with a worm wheel (10118), and the worm wheel (10118) is fixedly connected to the threaded rod (10113).

5. The retractable transformer maintenance staircase according to claim 4, characterized in that: A plurality of mounting ears (10110) are fixedly mounted on both sides of the mounting seat (10101), and the mounting ears (10110) are arranged at equal distances.

6. The retractable transformer maintenance staircase according to claim 1, characterized in that: The telescopic ladder assembly (102) comprises a plurality of lifting pedals (10201), both ends of the lifting pedals (10201) are provided with fixing rings (10202), a telescopic tube (10203) is fixedly installed inside the fixing ring (10202), and a protective ring (10208) is fixedly installed on one side of the two fixing rings (10202).

7. The retractable transformer maintenance staircase according to claim 6, characterized in that: The top end of the telescopic tube (10203) is sleeved on the outside of the adjacent telescopic tube (10203), and the bottom end of the telescopic tube (10203) is inserted and arranged on the inside of the adjacent telescopic tube (10203).

8. The retractable transformer maintenance staircase according to claim 7, characterized in that: A first limiting ring (10204) is fixedly installed on the inner side of the top end of the telescopic tube (10203), and a second limiting ring (10205) is fixedly installed on the outer side of the top end of the telescopic tube (10203).

9. The retractable transformer maintenance staircase according to claim 8, characterized in that: An anti-sliding block (10206) is fixedly installed in the middle of the top of the lifting pedal (10201), the bottom of the lifting pedal (10201) arranged at the top of the telescopic ladder assembly (102) is fixedly connected to the mounting frame (10115), and the bottom of the lifting pedal (10201) arranged at the bottom of the telescopic ladder assembly (102) is fixedly connected to the sliding block (10112).

10. The retractable transformer maintenance staircase according to claim 1, characterized in that: A support tube (10209) is fixedly installed at the bottom of the telescopic tube (10203) arranged at the lowest end of the telescopic ladder assembly (102), a fixed pedal (10210) is fixedly installed between the two support tubes (10209), and a support foot (10207) is fixedly installed at the bottom of the support tube (10209).

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