A safety climbing ladder with adjustable wall hanging width for power shaft

Abstract

The application discloses a safety climbing ladder with adjustable hanging width for power shaft wall, and relates to the field of climbing ladders for power construction and maintenance. With the increase of underground power facilities, the existing wall-mounted climbing ladders cannot meet the construction and operation requirements due to the fixed opening, the need to damage the shaft wall during installation and the inability to adapt to depth changes. The application comprises an upper segment, a lower segment, an optional intermediate segment and a grounding assembly. The vertical hanging part of the upper segment and the vertical segment part are adjusted in spacing by an adjustable hanging mechanism to adapt to the wall thickness, and are fixed by the friction of the anti-skid pad on the vertical hanging part and the supporting arm. The grounding system is located at the bottom of the ladder segment and is connected to the ground net through the grounding terminal to realize equipotential protection. The application can adapt to shaft walls of different thicknesses by adjusting the width of the upper segment, realize non-damage fast hanging, and the grounding assembly provides standard and reliable active grounding protection for the entire conductive climbing ladder, fundamentally preventing the risk of electric shock of the operator.

Description

Technical Field

[0001] This invention relates to the field of ladders for power construction and maintenance, and more particularly to a safety ladder with adjustable hanging width for use on the wall of a power shaft. Background Technology

[0002] With the acceleration of urbanization and the intensive development of underground space resources, the number of deeply buried or extremely deep structures such as large power shafts, ultra-deep cable caissons, integrated utility tunnels, and traffic tunnels is increasing. During the construction and subsequent operation and maintenance of these structures, workers often need to move up and down, making safe and convenient climbing equipment an essential tool. Currently, traditional wall-mounted fixed ladders or temporary ladders requiring on-site welding and bolt anchoring are commonly used in such environments. These existing technologies have significant drawbacks: First, their support structure opening size is fixed, making them unsuitable for shaft walls or lining surfaces of varying thicknesses or with protrusions, resulting in poor versatility. Second, installation using bolt anchoring or welding is not only cumbersome and inefficient but can also cause irreversible damage to the shaft wall structure, limiting their use in existing building structures or situations requiring structural integrity. Third, in dynamic construction scenarios such as tunnel excavation and shaft excavation, the working face depth continuously changes, and fixed-length ladders cannot be adjusted accordingly, leading to frequent disassembly, assembly, and extension, posing safety hazards and severely impacting construction efficiency. Furthermore, environments such as power shafts pose a risk of electric shock, and ordinary climbing ladders lack effective equipotential grounding protection. Therefore, there is an urgent need for a climbing device that is quick to install, requires no damage to the shaft structure, can flexibly adapt to changes in structural dimensions and working depth, and has grounding safety protection. Summary of the Invention

[0003] The technical problem to be solved and the technical task proposed by this invention is to improve and refine existing technical solutions, and to provide a safety ladder with adjustable width for hanging on the walls of power shafts, so as to facilitate hanging on shaft walls of different thicknesses and depths, and to provide reliable electrical safety protection for workers. To this end, this invention adopts the following technical solution.

[0004] An adjustable-width safety ladder for hanging on the wall of a power shaft is disclosed. The main body of the safety ladder is conductive and includes an upper section, a lower section, and a grounding component. The upper section has an adjustable hanging mechanism to match the thickness of the upper shaft wall. The upper end of the lower section and the lower end of the upper section are connected and fixed by a matching positioning structure. The grounding component includes a grounding terminal located at the bottom of the lower section, which can be detachably connected to a grounding component pre-installed at the bottom of the power shaft. When the upper and lower sections of the ladder are connected in place and the grounding terminal is connected to the grounding component, a continuous electrical conduction path covering the entire safety ladder is formed. The adjustable hanging mechanism of the upper section allows it to adapt to shaft walls of different thicknesses, achieving rapid and damage-free hanging. The segmented design facilitates transportation and adaptability to shafts of different depths. The grounding component provides reliable active grounding protection for the entire conductive ladder, providing reliable electrical safety protection for workers and fundamentally eliminating the risk of electric shock.

[0005] As a preferred technical means: the upper segment includes a vertical segment portion located above the lower segment, a vertically mounted abutment portion arranged parallel to the vertical segment portion, and an adjustable abutment mechanism horizontally connected between the upper ends of the vertical segment portion and the vertically mounted abutment portion. The adjustable abutment mechanism adopts a push-button type adjustment structure or a screw type adjustment structure. The push-button type adjustment structure or the screw type adjustment structure is convenient to operate, has good reliability, and is easy to implement.

[0006] As a preferred technical approach: the vertical segments are arranged at vertical intervals, and multiple retractable and fixed support arms are evenly distributed in pairs horizontally towards the vertical abutment. The support arms are threadedly adjusted, including a screw, an adjusting nut, and a locking nut. The screw is extended or retracted by rotating the adjusting nut, and locked in place by the locking nut. The end of the screw has a top plate for abutting against the shaft wall. The support arms and the vertical abutment can clamp from both sides of the shaft wall, distributing the climbing load over a larger contact surface, greatly enhancing the lateral stability and torsional resistance of the ladder after it is attached. The combination of the screw, adjusting nut, and locking nut achieves both adjustment and reliable locking, ensuring a secure fixation.

[0007] As a preferred technical means: a rubber anti-slip pad is provided on the side of the top plate that contacts the shaft wall; a rubber anti-slip pad corresponding to the position of the top plate of the support arm is provided on the side of the vertical hanging part facing the shaft wall. Utilizing the high coefficient of friction of rubber, a large static friction force is generated between the ladder and the shaft wall surface, effectively achieving frictional fixation. The soft rubber pad protects the shaft wall finish from scratches by metal parts, while also adapting to minor unevenness in the wall surface, ensuring tight contact and uniform force distribution.

[0008] As a preferred technical approach, this also includes the option to add intermediate segments connecting the upper and lower segments, depending on the actual height requirements. By adding standardized intermediate segments, ladder lengths can be flexibly combined to adapt to different well depths, significantly improving the product's versatility and economy, eliminating the need to customize the entire ladder for each depth.

[0009] As a preferred technical approach: the upper ends of the intermediate and lower segments are provided with locking heads, and the lower ends of the upper and intermediate segments are provided with locking holes that mate with the locking heads. The locking heads are inserted into the locking holes to position and fix adjacent segments. This structure can guide and initially limit the movement during assembly, enabling rapid and accurate alignment and pre-fixation between segments, facilitating subsequent final tightening, and simplifying assembly operations at heights or in confined spaces.

[0010] As a preferred technical approach: the clamp head is provided with two sets of bolt holes, one upper and one lower. The lower ends of the upper and middle segments are provided with two sets of bolt holes corresponding to the positions of the bolt holes on the clamp head. After the clamp head is inserted into the clamp holes to position and mate the adjacent segments, the upper and lower sets of snap-fit ​​bolts are inserted into the bolt holes for connection and fixation. Based on the clamping and positioning, the upper and lower sets of snap-fit ​​bolts are further used for final fixation. This ensures the rigidity and strength of the connection node while taking into account the convenience of assembly and disassembly. The double bolt arrangement can effectively prevent rotation at the connection point, provide a stable connection, and allow for quick tightening or disassembly.

[0011] As a preferred technical means: a spring is connected to the bottom of the locking head at the upper end of the lower section, and the lower end of the spring is connected to a spring seat. The spring seat is fixed to the inner wall of the ladder tube of the lower section. The lower end of the lower section is provided with a pull rope that can be pulled by foot. The pull rope extends into the ladder tube of the lower section to the left and right sides and extends upward until it is connected and fixed to the bottom of the locking head at the upper end of the lower section. A sliding gap is provided between the locking head at the upper end of the lower section and the inner wall of the locking hole of the ladder tube at the lower end of the corresponding upper section and / or intermediate section. By pulling the pull rope at the bottom of the lower section, the spring force can be overcome and the locking head can be pulled downward to unlock, avoiding the operational risks and inconvenience of workers climbing to manually unlock, and significantly improving the safety and efficiency of the installation or disassembly process.

[0012] As a preferred technical means: the grounding terminal is a grounding bolt, which is detachably connected to the bottom of the two sides of the lower section of the ladder tube. The grounding component includes a grounding flat iron, which is provided with a grounding limiting connection hole that matches the grounding bolt. This allows for convenient and reliable grounding connection between the grounding terminal and the grounding flat iron.

[0013] As a preferred technical approach, the intermediate segment adopts a telescopic ladder section. This provides flexibility for stepless or stepped adjustment of the ladder length, allowing the ladder to more accurately match the well depth, reducing redundant length, and making the structure more compact, especially suitable for occasions with frequent depth changes or limited space.

[0014] As a preferred technical approach, the retractable ladder section adopts either a nested sleeve telescopic structure or a sliding segment telescopic structure. The nested sleeve telescopic structure is locked by a built-in spring locking pin and positioning holes, while the sliding segment telescopic structure uses an outer frame slide rail combined with an inner frame slide groove structure, fixed by a latch or pin. These two types of retractable ladder structures can be used in different power engineering scenarios and are easy to operate.

[0015] As a preferred technical means, the system also includes a roller assembly, which comprises a clamp, a vertical connecting frame, and rollers. The clamp is fixed to an adjustable attachment mechanism, and the vertical connecting frame has a lifting and adjusting structure to adjust the distance between the rollers and the clamp. By detachably fixing the roller assembly to the adjustable attachment mechanism using the clamp, the entire ladder can move flexibly on the ground or well platform using the rollers in the non-attached state, eliminating the need for multiple people to carry it or the use of lifting equipment, significantly reducing the difficulty of transportation and relocation.

[0016] As a preferred technical approach, the upper, middle, and lower segments are all made of high-strength aluminum alloy. High-strength aluminum alloy achieves overall lightweighting while ensuring sufficient structural strength, greatly facilitating manual handling and installation. The excellent corrosion resistance of aluminum alloy allows it to adapt to harsh environments such as dampness and even corrosive media in shafts and tunnels, extending its service life. Simultaneously, its good conductivity is the foundation for working in conjunction with grounding components to achieve equipotential grounding protection.

[0017] Beneficial effects: 1. It adopts an adjustable-width friction fixing design, which can adapt to well walls of different thicknesses without drilling holes or pre-embedding bolts in the well wall, and realizes rapid and non-destructive installation, making it particularly suitable for temporary or emergency repair operations.

[0018] 2. The main body of the ladder adopts a height-adjustable structure, and its length can be flexibly adjusted and locked according to the actual working depth of the shaft or tunnel, avoiding frequent replacement or customization of the ladder due to changes in depth, and significantly improving the working efficiency in dynamic construction scenarios.

[0019] 3. By integrating grounding components and setting grounding connection points on the conductive ladder, it can be reliably connected to the on-site grounding grid to form a low-impedance discharge channel, effectively preventing workers from being electrocuted. This transforms the ladder, which could have become a conductive carrier, into a safety device with active electric shock protection capabilities. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the installation state of the present invention.

[0021] Figure 2 This is a schematic diagram illustrating the separation of the upper and lower segments of the present invention.

[0022] Figure 3 This is a schematic diagram of the upper segment structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the clip connection structure of the lower segment of the present invention.

[0024] Figure 5 This is a schematic diagram of the intermediate segment structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the upper segment structure of another structure of the present invention.

[0026] In the diagram: 1. Upper segment; 2. Lower segment; 3. Clip bolt; 4. Grounding terminal; 5. Intermediate segment; 6. Well wall; 101. Adjustable hanging mechanism; 10101. Outer pipe; 10102. Inner rod; 10103. Spring pin; 102. Vertical hanging part; 103. Vertical segment part; 104. Support arm; 10401. Screw; 10402. Adjusting nut; 10403. Locking nut; 105. Rubber anti-slip pad; 106. Top plate; 201. Clamp; 202. Spring; 203. Spring seat; 204. Pull rope; 7. Roller assembly; 701. Clamp; 702. Vertical connecting frame; 703. Roller. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1 like Figures 1-3As shown, this embodiment provides a safety ladder with adjustable hanging width for use in power shafts. It includes an upper section 1, a lower section 2, and a grounding assembly. The upper section 1 serves as the hanging and fixing part, and its main body is a generally inverted "J"-shaped frame. Specifically, it includes a vertical section 103, a vertical hanging part 102 parallel to the vertical section 103, and an adjustable hanging mechanism 101 horizontally connected between the upper ends of the vertical section 103 and the vertical hanging part 102. The adjustable hanging mechanism 101 can adjust its horizontal span, thereby changing the distance between the vertical hanging part 102 and the vertical section 103 to adjust the hanging width of the upper section 1, adapting to shaft walls or linings of different thicknesses. The lower section 2 is connected to the lower end of the vertical section 103. The grounding assembly includes a grounding terminal 4 disposed at the bottom of the lower section 2, specifically a grounding bolt disposed at the bottom of the lower section 2 as a grounding terminal. During installation, the grounding bolt at the bottom of the lower section 2 can be inserted downwards into the pre-drilled grounding limit connection hole on the grounding flat iron to achieve a quick limit connection. This grounding bolt forms a continuous electrical conduction path with the entire ladder through the internal metal structure. The upper end of the lower section 2 is positioned and fixed by inserting its clamp 201 upwards into the clamp hole at the lower end of the upper section 1.

[0029] To simplify operation, the adjustable attachment mechanism 101 adopts a push-button spring-loaded adjustment structure. This structure includes an outer tube 10101 horizontally connected to the upper end of the vertical section 103 and an inner rod 10102 horizontally connected to the upper end of the vertical attachment part 102. The inner rod 10102 is slidably disposed within the outer tube 10101. The inner rod 10102 is equipped with a spring-loaded pin 10103, which has a spherical pin head. The outer tube 10101 has multiple pin holes arranged on its wall. The attachment width is adjusted by pushing and pulling the vertical attachment part 102 and the vertical section 103 in opposite or opposite directions to match the well wall thickness. When the spherical pin head of the spring-loaded pin 10103 engages with the corresponding pin hole, the relative position of the vertical attachment part 102 and the vertical section 103 is fixed. This design is convenient to operate, reliable, and easy to implement.

[0030] To enhance stability after attachment, four retractable and fixed support arms 104, two vertically and two horizontally, are horizontally oriented towards the vertical attachment part 102 on the side of the vertical segment 103. In this embodiment, the support arms 104 adopt a threaded adjustment method, including a screw 10401, an adjusting nut 10402, and a locking nut 10403. The screw 10401 is extended and retracted by rotating the adjusting nut 10402, and locked and fixed by the locking nut 10403. The end of the screw 10401 is provided with a top plate 106 for pressing against the shaft wall. These support arms 104 form four support and fixing points between the upper segment 1 and the shaft wall, which makes the attachment of the ladder more secure and stable, and can distribute the lateral force generated by climbing to a larger contact surface with the shaft wall. This effectively prevents the ladder from swaying or overturning due to the long cantilever structure in deep wells, improves the safety redundancy of the overall structure, and significantly enhances the lateral stability and anti-torsional performance of the ladder after attachment.

[0031] To more reliably ensure the stability of the ladder attachment, such as Figure 3 As shown, a rubber anti-slip pad 105 is provided on the side of the top plate 106 at the end of the support arm 104 that contacts the well wall; a rubber anti-slip pad 105 corresponding to the position of the top plate 106 of the support arm 104 is provided on the side of the vertical hanging part 102 facing the well wall. This design increases the effective frictional contact area between the ladder and the well wall, so that both inner sides of the "inverted J-shaped" opening of the upper section 1 can tightly adhere to and "bite" the well wall, which not only enhances the vertical anti-slip ability, but also greatly improves the ability to resist the torsion of the ladder around the vertical axis, making the hanging state more stable and reliable. At the same time, the high friction coefficient of the rubber anti-slip pad 105 generates a large static friction force with the surface of the well wall, which is the key to the ladder's stable hanging; in addition, the soft rubber pad can adapt to the slight unevenness of the well wall surface, while preventing the hard metal support arm 104 from directly scratching or damaging the well wall, thus playing a protective role.

[0032] To achieve rapid positioning and fixation, such as Figure 4As shown, a spring 202 is connected to the bottom of the clamp 201 at the upper end of the lower section 2. The lower end of the spring 202 is fixed to the spring seat 203. The spring seat 203 is fixed to the inner wall of the ladder tube of the lower section 2. A pull rope 204 is provided at the lower end of the lower section 2 for stepping and pulling. The pull rope 204 extends into the ladder tube of the lower section 2 on both sides and extends upward until it is connected and fixed to the bottom of the clamp 201 at the upper end of the lower section 2. A sliding gap is provided between the clamp 201 at the upper end of the lower section 2 and the inner wall of the ladder tube clamp hole at the lower end of the upper section 1. When the ladder consists only of an upper section 1 and a lower section 2, the initial position of the locking head 201 at the upper end of the lower section 2 is higher than the upper surface of the ladder tube. By stepping on and pulling the rope 204 at the bottom of the lower section 2, the elastic force of the spring 202 can be overcome, pulling the locking head 201 downwards. Then, the locking head 201 at the upper end of the lower section 2 is aligned with the locking hole at the lower end of the upper section 1. Finally, the rope 204 is released, allowing the locking head 201 to enter the lower end of the upper section 1, achieving a locking connection. This avoids the risks and inconvenience of workers climbing to manually unlock the ladder, significantly improving the safety and efficiency of the installation or disassembly process. In this embodiment, the rope 204 is made of steel wire rope.

[0033] To achieve a more stable and reliable connection, the clamp head 201 is provided with two sets of bolt holes, one upper and one lower. The lower ends of the upper segment 1 and the middle segment 5 have two sets of bolt holes corresponding to the positions of the bolt holes on the clamp head 201. After the clamp head 201 is inserted into the clamp holes to position and mate the adjacent segments, the upper and lower sets of snap-fit ​​bolts 3 are inserted into the bolt holes for connection and fixation. Based on the clamping and positioning, the upper and lower sets of snap-fit ​​bolts 3 are further used for final fixation. This ensures the rigidity and strength of the connection node while also taking into account the convenience of assembly and disassembly. The double bolt arrangement effectively prevents rotation at the connection point, provides a stable connection, and allows for quick tightening or disassembly.

[0034] In this embodiment, both the upper segment 1 and the lower segment 2 are made of high-strength aluminum alloy. The high-strength aluminum alloy achieves overall lightweighting while ensuring sufficient structural strength, greatly facilitating manual handling and installation. The excellent corrosion resistance of aluminum alloy allows it to adapt to harsh environments such as dampness and even corrosive media in shafts and tunnels, extending its service life. Simultaneously, its good conductivity is the foundation for working in conjunction with grounding components to achieve equipotential grounding protection.

[0035] The installation and use process of this safety ladder is as follows: S1. Based on the measured thickness of the target well wall, the vertical hanging part 102 and the vertical segment part 103 are pushed and pulled in opposite directions to activate the pressing spring-type adjustment structure, thereby increasing the distance between the vertical segment part 103 and the vertical hanging part 102, so that the width of the inverted "J" shaped opening of the upper segment 1 is greater than the thickness of the vertical well wall.

[0036] S2. Place the upper section 1 horizontally, so that its inverted "J"-shaped opening fits into the top of the well wall. Adjust the position so that the vertical hanging part 102 is located on the inside of the well wall and the vertical section part 103 is located on the outside of the well wall, with the entire upper section 1 straddling the upper edge of the well wall. Then, adjust the adjusting nuts 10402 of each support arm 104 in sequence so that the rubber anti-slip pads 105 at the ends of the support arms 104 are tightly pressed against the outer side of the well wall, while the rubber anti-slip pads 105 on the inside of the vertical hanging part 102 are also tightly pressed against the inner side of the well wall. By tightening symmetrically, the ladder is firmly suspended on the well wall by friction.

[0037] S3. Erect the lower section 2 vertically inside the well and position it below the upper section 1, aligning the grounding bolt at the lower end of the lower section 2 with the reserved grounding limit connection hole of the lower grounding flat iron. Step on the pull rope 204 at the lower end of the lower section 2 to retract the clamp 201 at the upper end of the lower section 2. After aligning the upper end of the lower section 2 with the lower end of the upper section 1, release the pull rope 204. The clamp 201 will pop out under the action of the spring 202 and insert into the clamp hole at the lower end of the upper section 1.

[0038] S4. After aligning the clips 201 and clip holes on each side of the ladder tube, connect and tighten them using the upper and lower sets of clip bolts 3.

[0039] Example 2 Unlike Embodiment 1, the adjustable mounting mechanism 101 adopts a screw-type adjustment structure. The screw-type adjustment structure includes an outer tube 10101 horizontally connected to the upper end of the vertical mounting part 102 and an inner rod 10102 horizontally connected to the upper end of the vertical segment part 103. The outer tube 10101 has an internal thread, and one end of the inner rod 10102 has an external thread that matches the internal thread of the outer tube 10101. The other end of the inner rod 10102 has an adjustment knob. The outer tube 10101 is fixedly connected to the vertical mounting part 102, and the inner rod 10102 is rotatably connected to the upper end of the vertical segment part 103, allowing only rotation around its own axis and preventing axial movement. By rotating the adjustment knob, the inner rod 10102 can be screwed into or out of the outer tube 10101, thereby adjusting the distance between the vertical mounting part 102 and the vertical segment part 103. It is convenient to operate, has good reliability, and is easy to implement.

[0040] Example 3 Unlike Embodiment 1 or Embodiment 2, as Figure 5 As shown, it also includes an intermediate section 5 that can be optionally added between the upper section 1 and the lower section 2, depending on the actual shaft height requirements. By adding standardized intermediate sections 5, ladder lengths can be flexibly combined to adapt to different shaft depths, significantly improving the product's versatility and economy, eliminating the need to customize the entire ladder for each depth.

[0041] To facilitate well depth matching operations, intermediate segment 5 employs a telescopic ladder section. This design provides flexibility for stepless or stepped length adjustment, allowing the ladder to more accurately match the well depth, reducing redundant length, and resulting in a more compact structure, making it particularly suitable for applications with frequent depth changes or limited space.

[0042] In this embodiment, the telescopic ladder section adopts a nested sleeve telescopic structure, consisting of inner and outer sleeves. The length is quickly adjusted and locked through a built-in spring locking pin that engages with positioning holes at different heights. Alternatively, a sliding segmented telescopic structure can be used, employing an outer frame slide rail combined with an inner frame slide groove structure, secured by latches or pins. Both of these telescopic ladder structures are widely used in various power engineering applications, are technologically mature, and are easy to operate.

[0043] The middle segment 5 is positioned with the upper segment 1 and the lower segment 2 is positioned with the middle segment 5 by the locking head 201 engaging with the locking hole and is fixed by the locking bolt 3.

[0044] Example 4 Unlike the embodiments described above, when the grounding flat iron or grounding busbar is too far from the grounding bolt at the bottom of the ladder to be directly inserted, a standard grounding wire can be used for connection. One end of the grounding wire is securely connected to the grounding bolt at the grounding terminal 4 at the bottom of the lower section 2 via a terminal block, and the other end is similarly connected to the grounding flat iron or grounding busbar pre-installed in the shaft via a bolt. This connection method ensures reliable connection between the entire conductive aluminum alloy ladder and the earth's potential, forming continuous equipotential grounding protection.

[0045] Example 5 like Figure 6 As shown, the similarities with Embodiment 1 will not be repeated here. The difference is that this embodiment adds a roller assembly 7.

[0046] The roller assembly 7 is detachably mounted on the outside of the adjustable hanging mechanism 101. The roller assembly 7 includes a clamp 701, a vertical connecting frame 702, and rollers 703. The clamp 701 is semi-circular or U-shaped, and its inner contour is adapted to the outer contour of the outer tube of the adjustable hanging mechanism. The two ends of the clamp 701 are tightened together by bolts or quick-release buckles, thereby clamping and fixing it to the outer tube 10101 without drilling or welding the original outer tube 10101.

[0047] The upper end of the vertical connecting frame 702 is fixedly connected to the clamp 701 or integrally formed, and the lower end is equipped with a roller 703. The axis of the roller 703 is arranged horizontally. After the clamp 701 is fixed to the horizontal bar, the roller 703 can directly contact the upper edge of the shaft wall or the track preset on the upper edge of the shaft wall.

[0048] Preferably, the vertical connecting frame 702 is equipped with a lifting adjustment structure, which uses a threaded sleeve and a screw, or a slotted hole and a locking bolt, to adjust the vertical height of the roller 703 relative to the clamp 701. When the ladder needs to be moved, the rubber anti-slip pad 105 is disengaged from the well wall, and the roller 703 is adjusted downwards to lift the entire ladder. After moving it into place, the grounding terminal 4 is aligned with the grounding flat iron, and the roller 703 is adjusted upwards to retract it. At the same time, the grounding terminal 4 is inserted downwards into the grounding flat iron. Then, the hanging width of the adjustable hanging mechanism 101 and the support arm 104 are adjusted so that the rubber anti-slip pad 105 presses against the well wall.

[0049] Preferably, the roller 703 is a universal wheel or a fixed wheel with a brake structure, and has a linkage brake handle on one side.

[0050] The above are specific embodiments of the present invention, which demonstrate the outstanding substantive features and significant progress of the present invention. Based on the actual needs of use, equivalent modifications in shape, structure, etc., can be made to it according to the teachings of the present invention, and all such modifications are within the scope of protection of this solution.

Claims

1. A safety ladder with adjustable hanging width for use on the wall of an electric shaft, characterized in that: The main body of the safety ladder is a conductor, comprising an upper section, a lower section, and a grounding assembly. The upper section is equipped with an adjustable hook-up mechanism to match the thickness of the upper shaft wall. The upper end of the lower section and the lower end of the upper section are connected and fixed by a matching positioning structure. The grounding assembly includes a grounding terminal located at the bottom of the lower section, which can be detachably connected to a grounding component pre-installed at the bottom of the power shaft. When the upper and lower sections of the ladder are connected in place and the grounding terminal is connected to the grounding component, a continuous electrical conduction path covering the entire safety ladder is formed.

2. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 1, characterized in that: The upper segment includes a vertical segment portion located above the lower segment, a vertical hanging portion arranged parallel to the vertical segment portion, and an adjustable hanging mechanism horizontally connected between the upper ends of the vertical segment portion and the vertical hanging portion. The adjustable hanging mechanism adopts a press-and-release type adjustment structure or a screw type adjustment structure.

3. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 2, characterized in that: The vertical segments are arranged at intervals along the vertical direction, and multiple retractable and fixed support arms are evenly distributed in pairs in the horizontal direction, facing the vertical abutment. The support arms adopt a threaded adjustment method and include a screw, an adjusting nut and a locking nut. The screw is extended and retracted by rotating the adjusting nut and locked by the locking nut. The end of the screw is provided with a top plate for pressing against the vertical shaft wall.

4. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 3, characterized in that: A rubber anti-slip pad is provided on the side of the top plate that contacts the shaft wall; a rubber anti-slip pad corresponding to the position of the top plate of the support arm is provided on the side of the vertical hanging part facing the shaft wall.

5. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 4, characterized in that: It also includes the option to add an intermediate segment connecting the upper and lower segments, depending on the actual height requirements.

6. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 5, characterized in that: The upper ends of the middle segment and the lower segment are provided with locking heads, and the lower ends of the upper segment and the middle segment are provided with locking holes that match the locking heads. The locking heads are inserted into the locking holes to position and fix the adjacent segments.

7. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 6, characterized in that: The clamp head is provided with two sets of bolt holes, one above the other. The lower ends of the upper segment and the middle segment are provided with two sets of bolt holes corresponding to the positions of the bolt holes on the clamp head. After the clamp head is inserted into the clamp holes to position and fit the adjacent segments, the upper and lower clamp bolts are inserted into the bolt holes to connect and fix them.

8. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 6, characterized in that: A spring is connected to the bottom of the clamp at the upper end of the lower section. The lower end of the spring is connected to a spring seat, which is fixed to the inner wall of the ladder tube of the lower section. The lower end of the lower section is provided with a pull rope that can be pulled by foot. The pull rope extends into the ladder tube of the lower section to the left and right sides and extends upward until it is connected and fixed to the bottom of the clamp at the upper end of the lower section. There is a sliding gap between the clamp at the upper end of the lower section and the inner wall of the clamp hole of the ladder tube at the lower end of the corresponding upper section and / or intermediate section.

9. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 1, characterized in that: The grounding terminal is a grounding bolt, which is detachably connected to the bottom of the two sides of the lower section of the ladder tube. The grounding component includes a grounding flat iron, which is provided with a grounding limit connection hole that matches the grounding bolt.

10. A safety ladder with adjustable hanging width for use on the wall of a power shaft, as described in claim 2, characterized in that: It also includes a roller assembly, which includes a clamp, a vertical connecting frame, and rollers; the clamp is fixed to an adjustable hanging mechanism, and the vertical connecting frame is provided with a lifting adjustment structure to adjust the distance between the rollers and the clamp.

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