Foldable maintenance ladder for electric power facilities

Abstract

This application relates to a foldable maintenance ladder for power facilities, belonging to the technical field of power facility maintenance. It includes a maintenance ladder assembly, one end of which is hinged to a base assembly. Telescopic components are hinged to both sides of the base assembly. The maintenance ladder assembly includes a main ladder frame and a telescopic ladder frame. The telescopic ends of the telescopic components are hinged to the main ladder frame. The main ladder frame includes two main support frames, with several first footrests arranged between the two main support frames. Guide rails are provided within the main support frames, and sliding grooves for the telescopic ladder frame to slide are provided on opposite sides of the two main support frames. The guide rails communicate with the sliding grooves, and the telescopic ladder frame slides within the guide rails and sliding grooves. Several connecting members are provided on the side of the main ladder frame to fix the telescopic ladder frame to the main ladder frame. This application features foldable and telescopic functions to facilitate transportation and adapt to maintenance needs at different heights, while enhancing its stability and ensuring the safety and efficiency of maintenance operations.

Description

Technical Field

[0001] This application relates to the technical field of power facility maintenance, and in particular to a foldable maintenance ladder for power facilities. Background Technology

[0002] The maintenance of power facilities often requires maintenance personnel to climb to a certain height, making maintenance ladders an indispensable tool in power maintenance operations. Currently, most power maintenance ladders on the market are fixed structures, unable to be folded or extended, and are large and heavy, making them inconvenient for maintenance personnel to move and store, especially in scenarios requiring frequent relocation of work sites, thus placing a significant burden on maintenance personnel. Furthermore, due to the varying heights of different power facilities and the different maintenance locations, fixed-length ladders often cannot meet diverse maintenance needs, requiring workers to carry multiple ladders of different specifications, increasing operating costs and difficulty. Utility Model Content

[0003] To address the issue that most power maintenance ladders are fixed structures with large size and weight, making them inconvenient for maintenance personnel to move and store, and that fixed-length ladders cannot meet the diverse maintenance needs of different power facilities with varying heights and maintenance locations, this application provides a foldable maintenance ladder for power facilities.

[0004] This application provides a foldable maintenance ladder for power facilities, which adopts the following technical solution:

[0005] A foldable maintenance ladder for power facilities includes a base assembly and a maintenance ladder assembly. One end of the maintenance ladder assembly is hinged to the base assembly, and telescopic members are hinged to both sides of the base assembly. The telescopic ends of the telescopic members are hinged to the maintenance ladder assembly.

[0006] The maintenance ladder assembly includes a main ladder frame and a telescopic ladder frame. The telescopic end of the telescopic component is hinged to the main ladder frame. The main ladder frame includes two main support frames, and a plurality of first foot pedals are arranged between the two main support frames. A guide rail is provided inside the main support frame. Sliding grooves for the telescopic ladder frame to slide are provided on opposite sides of the two main support frames. The guide rails are connected to the sliding grooves. The telescopic ladder frame is slidably arranged in the guide rails and sliding grooves. A plurality of connecting members are provided on the side of the main ladder frame to fix the telescopic ladder frame to the main ladder frame.

[0007] By adopting the above technical solution, the base assembly provides stable support for the overall ladder, and the maintenance ladder assembly achieves folding functionality through hinged connection with the base assembly, reducing storage space when not in use. The telescopic component is adjustable in length to support the maintenance ladder assembly at different unfolding angles, enhancing structural stability during use. The first footrest of the main ladder frame provides foot support for maintenance personnel, and the telescopic ladder frame can slide along guide rails and sliding grooves to achieve length adjustment. Combined with connecting parts to fix different telescopic positions, it meets the maintenance needs of power facilities at different heights, solving the problem of poor applicability of fixed-length ladders.

[0008] Optionally, the telescopic ladder frame includes two telescopic support frames, and a plurality of second foot pedals are arranged between the two telescopic support frames. The telescopic support frames are provided with guide members that slide with the guide rail. The first foot pedal is located on one side of the second foot pedal, and a gap is provided between the first foot pedal and the second foot pedal.

[0009] By adopting the above technical solution, the telescopic support frame and the main support frame's guide rails and sliding grooves cooperate to achieve the telescopic function. The guide components reduce friction and offset during the sliding process, ensuring smooth and stable telescopic operation. The second foot pedal is staggered with the first foot pedal and a gap is reserved to avoid mutual interference between the two during telescopic operation. At the same time, it provides maintenance personnel with a continuous foot support surface, ensuring the safety and comfort of the climbing process.

[0010] Optionally, a plurality of first connecting holes are arranged along the length of the main support frame on one side, and a plurality of second connecting holes are arranged along the length of the telescopic support frame. The connector passes through the first connecting holes and the second connecting holes in sequence, and extends out of the second connecting hole. The extended end is connected to a locking member to fix the telescopic support frame to the main support frame.

[0011] By adopting the above technical solution, the corresponding cooperation between the first connecting hole and the second connecting hole provides multiple fixed options for the telescopic ladder frame. After the connecting piece passes through the corresponding hole, it is fastened by the locking piece to lock the telescopic length. The total length of the ladder can be flexibly adjusted according to the actual maintenance height. The operation is simple and convenient, meeting the needs of diverse work scenarios.

[0012] Optionally, a tool box is rotatably mounted on the upper part of the telescopic ladder frame, the tool box being located between two second foot pedals. A first limiting member and a second limiting member are installed on the side of the telescopic ladder frame near the tool box. The first limiting member and the second limiting member are used to limit the rotation angle of the tool box. The first limiting member is located on one side of the tool box, and the second limiting member is located on the other side of the tool box.

[0013] By adopting the above technical solution, the toolbox can be raised and lowered synchronously with the telescopic ladder, making it convenient for maintenance personnel to retrieve and place tools during climbing, avoiding the inconvenience of carrying tools with them. The first and second limiting components together restrict the rotation range of the toolbox, preventing it from overturning and causing tools to fall, ensuring the stability of tool storage. At the same time, when not in use, the toolbox can be folded and fitted to the ladder, reducing storage volume.

[0014] Optionally, limit hooks are provided on both sides of the top of the telescopic ladder frame.

[0015] By adopting the above technical solution, the limiting hook can be attached to the fixed structure of the power facility, enhancing the connection stability between the top of the ladder and the maintenance target, and preventing the ladder from swaying or tipping over during climbing. The double-sided hook configuration further improves the fixing effect, is suitable for the edges of facilities of different shapes, and enhances the safety of the operation process.

[0016] Optionally, the base assembly includes a base plate and casters, with each corner of the bottom of the base plate equipped with a caster, and handles installed at both ends of the base plate.

[0017] By adopting the above technical solution, the base plate provides a stable bottom support for the ladder, the casters allow the ladder to move flexibly in the folded state, and the handles at both ends make it easy for maintenance personnel to push or drag it, greatly reducing the difficulty of handling. In scenarios where frequent changes of work location are required, it can improve mobility and reduce the burden on staff.

[0018] Optionally, several fixing units are installed on both sides of the base plate. Each fixing unit includes an extension plate, on which a fastening rod is threadedly connected. A handwheel is installed at one end of the fastening rod, and a fixing plate is connected at the other end. An anti-slip component is provided at the bottom of the fixing plate.

[0019] By adopting the above technical solution, the extension plate expands the support range of the base, and turning the handwheel drives the fastening rod to lower the fixed plate, ensuring the anti-slip components are tightly pressed against the ground, enhancing the stability of the ladder during use and preventing slippage. The threaded drive structure allows for adjustment of the fixed plate height, adapting to ground environments with varying flatness and improving the ladder's applicability in complex environments.

[0020] Optionally, the extension plate is provided with a plurality of positioning pins, which are connected to the extension plate by threaded transmission, and the bottom of the positioning pins is tapered.

[0021] By adopting the above technical solution, when working on soft ground, rotating the positioning pin allows its conical bottom to insert into the ground, further strengthening the stability of the base and preventing the ladder from tilting due to ground subsidence or uneven stress. The positioning pin, together with the fastening rod, forms multiple layers of fixation, further improving the safety of the ladder in complex outdoor terrain.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This maintenance ladder achieves folding and unfolding support by hinged connection between the base assembly and the maintenance ladder assembly, combined with the length adjustment of the telescopic component, thus solving the problems of large size and difficult transportation of traditional fixed ladders; through the sliding connection between the main ladder frame and the telescopic ladder frame and the positioning structure of the connecting component, the ladder length can be adjusted in multiple positions to adapt to maintenance needs at different heights. The size can be flexibly adjusted according to the maintenance height, eliminating the need to carry multiple specifications of ladders, reducing operating costs and difficulty;

[0024] 2. The universal wheels and handles on the base assembly enhance mobility, while the fastening rods, positioning pins, and top limit hooks of the fixing unit form a multi-stabilizing structure to ensure the safety of the ladder under different ground conditions and working conditions, adapting to diverse power facility maintenance scenarios. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the base assembly in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the fixed unit in the embodiments of this application;

[0028] Figure 4 This is a schematic diagram of the structure of the maintenance ladder assembly in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the main ladder frame in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the toolbox structure in an embodiment of this application;

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Base assembly; 11. Base plate; 12. Casters; 13. Handle; 14. Fixing unit; 141. Extension plate; 142. Fastening rod; 1421. Handwheel; 1422. Fixing plate; 143. Positioning pin; 2. Maintenance ladder assembly; 21. Main ladder frame; 211. Main support frame; 2111. First connecting hole; 2112. Guide rail; 2113. Sliding groove; 212. First foot pedal; 22. Telescopic ladder frame; 221. Telescopic support frame; 2211. Second connecting hole; 2212. Guide component; 222. Second foot pedal; 23. Connecting component; 24. Locking component; 25. Tool box; 26. Limit hook; 3. Telescopic component. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0037] This application discloses a foldable maintenance ladder for power facilities, referring to... Figures 1-4 The foldable maintenance ladder for power facilities includes a base assembly 1 and a maintenance ladder assembly 2. One end of the maintenance ladder assembly 2 is hinged to the base assembly 1. Both sides of the base assembly 1 are hinged to telescopic members 3, and the telescopic ends of the telescopic members 3 are hinged to the maintenance ladder assembly 2.

[0038] The maintenance ladder assembly 2 includes a main ladder frame 21 and a telescopic ladder frame 22. The telescopic end of the telescopic component 3 is hinged to the main ladder frame 21. The main ladder frame 21 includes two main support frames 211. Several first foot pedals 212 are arranged between the two main support frames 211. Guide rails 2112 are provided inside the main support frames 211. Sliding grooves 2113 for sliding of the telescopic ladder frame 22 are provided on opposite sides of the two main support frames 211. The guide rails 2112 are connected to the sliding grooves 2113. The telescopic ladder frame 22 is slidably arranged in the guide rails 2112 and the sliding grooves 2113. Several connecting parts 23 are provided on the side of the main ladder frame 21 to fix the telescopic ladder frame 22 to the main ladder frame 21.

[0039] In this foldable maintenance ladder for power facilities, the base assembly 1 provides an installation platform and stable support for the maintenance ladder assembly 2, ensuring the overall stability of the ladder when unfolded. The hinged connection between the base assembly 1 and the maintenance ladder assembly 2 enables the ladder to fold, significantly reducing its size and solving the problems of traditional fixed ladders being space-consuming and inconvenient to store. The telescopic component 3, through its own telescopic adjustment of length, supports the structural stability of the maintenance ladder assembly 2 at different unfolding angles, enhancing the ladder's anti-overturning ability under different tilting conditions. Its hinged ends can adapt to changes in the angle of the maintenance ladder assembly 2, transmitting support force.

[0040] The main ladder frame 21 forms the main framework of the maintenance ladder assembly 2. Two main support frames 211 provide a sliding guide structure for the telescopic ladder frame 22, and the first footrest 212 provides a foothold for maintenance personnel during climbing. Simultaneously, the main ladder frame 21 serves as the installation foundation for the telescopic ladder frame 22, which is fixed in place via connectors 23. The telescopic ladder frame 22 slides along the guide rails 2112 and sliding grooves 2113 of the main ladder frame 21, allowing for the adjustment of the overall length of the ladder to accommodate maintenance needs of power facilities at different heights. The telescopic ladder frame 22, in conjunction with the main ladder frame 21, forms an adjustable-length climbing channel, expanding the ladder's applicability. Maintenance personnel no longer need to carry multiple sizes of ladders, reducing operating costs and personnel burden.

[0041] The connector 23 passes through the connection hole between the main ladder frame 21 and the telescopic ladder frame 22, fixing the telescopic ladder frame 22 at a specific position on the main ladder frame 21, locking the length after extension, preventing the telescopic ladder frame 22 from sliding during climbing, and avoiding safety hazards caused by accidental sliding; the multi-position connection setting supports flexible length adjustment to adapt to different work scenarios and improve the practicality of the ladder.

[0042] This foldable maintenance ladder for power facilities achieves folding and storage through a hinged structure between the base assembly 1 and the maintenance ladder assembly 2, significantly reducing the ladder's volume and space occupation when idle, facilitating transportation and storage, and alleviating the burden of transportation during frequent relocation operations. The ladder's unfolding angle is supported by the telescopic component 3, and its length is adjusted through the sliding cooperation between the main ladder frame 21 and the telescopic ladder frame 22, adapting to power facilities of different heights, avoiding the inconvenience of carrying multiple ladders, and reducing operating costs. The telescopic length is locked by the connecting component 23, ensuring structural stability during climbing and reducing safety hazards. This maintenance ladder as a whole forms a foldable and telescopic multi-functional maintenance tool, meeting the needs of power facility maintenance for movement, storage, and diverse heights. Simultaneously, the folding and telescopic operations are convenient and labor-saving, improving work efficiency and the operator's experience.

[0043] The base assembly 1 includes a base plate 11 and casters 12. Casters 12 are installed at each corner of the bottom of the base plate 11, and handles 13 are installed at both ends of the base plate 11. The base plate 11 provides a stable installation foundation for the entire ladder, bearing the overall weight of the ladder, the load of maintenance personnel, and the installation and fixing of various components. Simultaneously, the base plate 11 distributes the force through its rigid structure, ensuring the bottom stability of the ladder when unfolded. The casters 12 convert the sliding friction between the ladder and the ground into rolling friction, allowing the ladder to move flexibly in its folded state, adapting to movement needs in different directions, facilitating adjustments to the transport path, and solving the problem of traditional fixed ladders being difficult to transport due to their weight and size. This is especially beneficial when frequently changing work locations, reducing the physical exertion of maintenance personnel.

[0044] Handles 13 provide a gripping point for maintenance personnel, making it easy to apply pushing or pulling force to move the ladder. Handles 13, together with casters 12, enable easy movement of the ladder, avoiding operational difficulties caused by the lack of gripping points during transport. The handles 13 at both ends facilitate single or double-person collaborative transport, adapting to the movement needs in different scenarios and further improving transport efficiency.

[0045] Several fixing units 14 are installed on both sides of the base plate 11. Each fixing unit 14 includes an extension plate 141, on which a fastening rod 142 is threadedly connected. A handwheel 1421 is installed at one end of the fastening rod 142, and a fixing plate 1422 is connected at the other end. The bottom of the fixing plate 1422 is provided with an anti-slip component. The extension plate 141 expands the support range of the fixing unit 14 and provides a mounting carrier for the fastening rod 142. The handwheel 1421 increases the force radius during operation, allowing the operator to easily rotate the fastening rod 142. The fastening rod 142, as a force transmission component, converts the rotational force of the handwheel 1421 into the pressure of the fixing plate 1422. That is, when the handwheel 1421 is rotated, the fastening rod 142 can move axially, driving the fixing plate 1422 to rise and fall, thereby achieving a tight fixation to the ground. The fastening rod 142 achieves precise height adjustment of the fixing plate 1422 through threaded transmission, adapting to ground with different flatness; the threaded structure has a self-locking function, which can maintain the pressure stability of the fixing plate 1422 after adjustment and prevent loosening.

[0046] The fixing plate 1422 evenly distributes the pressure transmitted by the fastening rod 142 to the ground, increasing the contact area with the ground. The anti-slip component increases the coefficient of friction between the fixing plate 1422 and the ground, preventing the ladder from slipping under pressure. The anti-slip component is usually made of rubber or has a textured surface to improve grip. The fixing plate 1422, together with the anti-slip component, further enhances the fixing effect, providing stable support on ground with varying flatness, ensuring safety during power maintenance work, and overcoming the limitation of traditional ladders that require high ground conditions. The elastic anti-slip component also acts as a buffer, reducing noise during ladder use.

[0047] The extension plate 141 is equipped with several positioning pins 143, which are connected to the extension plate 141 via threaded transmission. The bottom of each positioning pin 143 is tapered, allowing it to move axially up and down during rotation. This enables precise control of the insertion depth, adapting to varying ground hardness. The tapered bottom of the positioning pins allows them to easily penetrate surface soil or soft layers, reaching deep underground to form a stable support point and enhancing the ladder's resistance to overturning in complex terrain. As an auxiliary fixing component, the positioning pins 143 also enhance the ladder's anchoring effect on soft or slippery surfaces.

[0048] In this application, references Figure 1 , Figure 4 and Figure 5The telescopic ladder frame 22 includes two telescopic support frames 221, with several second foot pedals 222 arranged between the two telescopic support frames 221. Each telescopic support frame 221 has a guide member 2212 that slides with a guide rail 2112. A first foot pedal 212 is located on one side of the second foot pedals 222, and a gap is provided between the first foot pedal 212 and the second foot pedal 222. The telescopic support frame 221 serves as the main frame of the telescopic ladder frame 22, cooperating with the guide rail 2112 and sliding groove 2113 of the main ladder frame 21 to achieve sliding extension and retraction, thereby changing the overall length of the ladder to adapt to maintenance needs at different heights. This solves the problem of traditional fixed ladders having an invariable length and being difficult to adapt to facilities of different heights. Simultaneously, the telescopic support frame 221 also bears part of the load from the second foot pedals 222 and maintenance personnel.

[0049] The guide member 2212 slides in conjunction with the guide rail 2112 of the main ladder frame 21, restricting the movement trajectory of the telescopic ladder frame 22 and ensuring that the guide member 2212 slides smoothly along the direction of the guide rail 2112. This reduces friction and offset during the extension and retraction process, making the length adjustment operation easier and smoother. The telescopic ladder frame 22 can be freely extended and retracted according to the maintenance height. When extended, it increases the total length of the ladder to accommodate facilities at heights, and when shortened, it reduces the storage volume for easy handling and storage. It eliminates the need to carry multiple sizes of ladders, reducing operating costs and burden.

[0050] The second footrest 222 provides a foothold for maintenance personnel to climb, forming a continuous climbing path together with the first footrest 212 of the main ladder 21. This expands the effective foothold range of the ladder and provides reliable support for work at height after the telescopic ladder 22 is extended. The evenly arranged structure ensures safety and comfort during climbing and improves work efficiency. The second footrest 222 and the first footrest 212 are staggered to avoid interference during extension and retraction.

[0051] A plurality of first connecting holes 2111 are arranged along the length of the main support frame 211 on one side. A plurality of second connecting holes 2211 are arranged along the length of the telescopic support frame 221. The connector 23 passes through the first connecting hole 2111 and the second connecting hole 2211 in sequence and extends out of the second connecting hole 2211. The extended end is connected to a locking member 24 to fix the telescopic support frame 221 to the main support frame 211.

[0052] The first connecting hole 2111 provides multiple fixing points for the connector 23. As the telescopic support frame 221 slides, the second connecting hole 2211 aligns with the first connecting hole 2111 at different positions. Through combinations of different hole positions, multiple lengths of the telescopic ladder frame 22 can be fixed. That is, the telescopic ladder frame 22 can be fixed at different extension lengths according to maintenance needs, solving the problem of traditional fixed ladders having a single length and being unable to adapt to various heights. The connector 23 mechanically connects the main support frame 211 and the telescopic support frame 221, transmitting the force between them and preventing relative sliding of the telescopic ladder frame 22 during use.

[0053] The locking element 24 enhances the fixing effect of the connector 23 by tightening or clamping, preventing the connector 23 from falling off under vibration or stress, and further reinforcing the connection between the main support frame 211 and the telescopic support frame 221. The detachable design of the connector 23 and the locking element 24 facilitates subsequent readjustment of the ladder length as needed, balancing fixing reliability and operational flexibility. In this application, the connector 23 is a bolt and the locking element 24 is a nut, making installation and disassembly convenient and quick.

[0054] refer to Figure 1 , Figure 4 and Figure 6 A toolbox 25 is rotatably mounted on the upper part of the telescopic ladder frame 22, located between two second foot pedals 222. A first limiting member and a second limiting member are installed on the side of the telescopic ladder frame 22 near the toolbox 25. The first and second limiting members limit the rotation angle of the toolbox 25; the first limiting member is located on one side of the toolbox 25, and the second limiting member is located on the other side. A handle 13 is provided on the toolbox 25 near the maintenance personnel.

[0055] The tool box 25 is used to store maintenance tools and rises and falls synchronously with the telescopic ladder 22, making it convenient for maintenance personnel to retrieve and put away tools when working at different heights. This solves the problem that traditional maintenance ladders have no tool storage space and maintenance personnel have to carry tools with them, reducing the risk of tools falling and improving the convenience of operation.

[0056] The first limiting member restricts the rotation angle of the tool box 25 to that side, preventing the tool box 25 from overturning and causing the internal tools to fall out. The first limiting member and the second limiting member work together to form a two-way angle restriction, ensuring that the tool box 25 can only rotate within a preset range. This facilitates the use of tools while preventing tools from slipping due to excessive rotation angle, thus ensuring the safety of tool storage. The first and second limiting members on both sides allow the tool box 25 to stably fit against the ladder rack when not in use, reducing storage volume; when in use, the tool box 25 can be fixed at an angle that is easy to access, improving operational convenience.

[0057] The handle 13 provides a force point for the rotation of the tool box 25, making it convenient for maintenance personnel to pull the tool box 25 to open or close, making the operation of opening and closing the tool box 25 more labor-saving and convenient, especially when working at height, it can quickly complete the loading and unloading of tools and improve work efficiency.

[0058] refer to Figure 1 The telescopic ladder frame 22 is equipped with limit hooks 26 on both sides of its top. These limit hooks 26 are used to hook onto fixed structures of electrical facilities, such as beams or supports, connecting and securing the top of the ladder to the target being inspected. This limits lateral and longitudinal displacement of the ladder top and, together with the base assembly 1, enhances the connection stability between the ladder and the electrical facilities, providing a stable operating platform for maintenance personnel. The symmetrical arrangement of the limit hooks 26 on both sides ensures even force distribution, preventing unilateral deviation of the ladder and improving safety during high-altitude operations.

[0059] The implementation process of a foldable maintenance ladder for power facilities according to an embodiment of this application is as follows:

[0060] When not in use, the ladder can be rotated at the hinge point between the maintenance ladder assembly 2 and the base assembly 1, causing the maintenance ladder assembly 2 to fold towards the base assembly 1. At the same time, the telescopic component 3 is retracted to its shortest length, reducing the overall volume. During transport, the operator pulls the ladder using the handles 13 at both ends of the base plate 11 and uses the bottom casters 12 to move the ladder flexibly to the power facility maintenance site.

[0061] Upon reaching the work site, rotate the maintenance ladder assembly 2 to a suitable tilt angle and adjust the length of the telescopic component 3 to ensure the ladder remains stable. Operate the fixing unit 14 according to the ground conditions: On hard ground, rotate the handwheel 1421 to lower the fixing plate 1422, which then makes close contact with the ground through the anti-slip component; on soft ground, simultaneously rotate the positioning nail 143 so that its conical bottom inserts into the ground, forming multiple anchors to ensure the base is stable.

[0062] Depending on the height of the power facility, loosen the locking pieces 24 of the main support frame 211 and the telescopic support frame 221, pull out the telescopic ladder frame 22 to the required length, align the first connecting hole 2111 with the second connecting hole 2211 at the corresponding positions, insert the connector 23 and secure it with the locking pieces 24. Then hook the limit hook 26 at the top of the telescopic ladder frame 22 onto the crossbeam or bracket of the facility.

[0063] Before climbing, rotate the toolbox 25 using the handle 13 to open it within the angle range limited by the first and second limiting members, and take out the necessary maintenance tools. Maintenance personnel climb to the work position using the first foot pedal 212 and the second foot pedal 222, and carry out maintenance work with the help of the stable ladder structure. Tools can be taken out or stored from the toolbox 25 at any time during the operation.

[0064] After maintenance, put the tools back into the toolbox 25 and fold them to fit the ladder frame. Loosen the top limit hook 26, lower the telescopic ladder frame 22 and lock it. Then loosen the fastening rod 142 and positioning pin 143 of the bottom fixing unit 14, retract the telescopic component 3, fold the maintenance ladder assembly 2 above the base assembly 1, and after resetting, move the ladder to the storage position using the casters 12.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A foldable maintenance ladder for power facilities, characterized in that: It includes a base assembly (1) and a maintenance ladder assembly (2). One end of the maintenance ladder assembly (2) is hinged to the base assembly (1). Both sides of the base assembly (1) are hinged to telescopic members (3). The telescopic ends of the telescopic members (3) are hinged to the maintenance ladder assembly (2). The maintenance ladder assembly (2) includes a main ladder frame (21) and a telescopic ladder frame (22). The telescopic end of the telescopic component (3) is hinged to the main ladder frame (21). The main ladder frame (21) includes two main support frames (211). A plurality of first foot pedals (212) are arranged between the two main support frames (211). A guide rail (2112) is provided in the main support frame (211). A sliding groove (2113) for sliding of the telescopic ladder frame (22) is provided on the opposite side of the two main support frames (211). The guide rail (2112) is connected to the sliding groove (2113). The telescopic ladder frame (22) is slidably arranged in the guide rail (2112) and the sliding groove (2113). A plurality of connectors (23) are provided on the side of the main ladder frame (21) to fix the telescopic ladder frame (22) on the main ladder frame (21).

2. The foldable maintenance ladder for power facilities according to claim 1, characterized in that: The telescopic ladder frame (22) includes two telescopic support frames (221), and a plurality of second foot pedals (222) are arranged between the two telescopic support frames (221). The telescopic support frame (221) is provided with a guide member (2212) that slides with the guide rail (2112). The first foot pedal (212) is located on one side of the second foot pedal (222), and a gap is provided between the first foot pedal (212) and the second foot pedal (222).

3. The foldable maintenance ladder for power facilities according to claim 2, characterized in that: The main support frame (211) has a plurality of first connecting holes (2111) arranged along the length of the main support frame (211) on one side. The telescopic support frame (221) has a plurality of second connecting holes (2211) arranged along the length of the telescopic support frame (221). The connector (23) passes through the first connecting hole (2111) and the second connecting hole (2211) in sequence, and extends out of the second connecting hole (2211). The extended end is connected to a locking member (24) to fix the telescopic support frame (221) on the main support frame (211).

4. The foldable maintenance ladder for power facilities according to claim 1, characterized in that: A toolbox (25) is rotatably mounted on the upper part of the telescopic ladder (22). The toolbox (25) is located between two second foot pedals (222). A first limiting member and a second limiting member are installed on the side of the telescopic ladder (22) near the toolbox (25). The first limiting member and the second limiting member are used to limit the rotation angle of the toolbox (25). The first limiting member is located on one side of the toolbox (25), and the second limiting member is located on the other side of the toolbox (25).

5. The foldable maintenance ladder for power facilities according to claim 1, characterized in that: Limit hooks (26) are provided on both sides of the top of the telescopic ladder (22).

6. The foldable maintenance ladder for power facilities according to claim 1, characterized in that: The base assembly (1) includes a base plate (11) and casters (12). Each corner of the bottom of the base plate (11) is provided with a caster (12), and handles (13) are provided at both ends of the base plate (11).

7. The foldable maintenance ladder for power facilities according to claim 6, characterized in that: Several fixing units (14) are installed on both sides of the base plate (11). Each fixing unit (14) includes an extension plate (141). A fastening rod (142) is threaded onto the extension plate (141). A handwheel (1421) is installed at one end of the fastening rod (142), and a fixing plate (1422) is connected to the other end. An anti-slip component is provided at the bottom of the fixing plate (1422).

8. The foldable maintenance ladder for power facilities according to claim 7, characterized in that: The extension plate (141) is provided with a plurality of positioning pins (143), which are connected to the extension plate (141) by threaded transmission, and the bottom of the positioning pins (143) is tapered.

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