Folding ladder for overhauling hydro-generator
By designing a folding ladder for maintenance of water turbine generators, the problem of difficulty in ladder transfer and storage is solved, and convenient storage and safe maintenance process is achieved.
Patent Information
- Application Number
- CN202421579956.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-04
AI Technical Summary
In the prior art, after maintenance of the water turbine generator, the ladder is large in size and heavy in weight, which makes it inconvenient to transfer and storage when the space inside the turbine is limited.
A folding ladder for maintenance of water turbine generators is designed, including an inner plate, an outer plate, a pedal and a drive mechanism. The pedal and outer plates are expanded and folded through articulated connections and drive mechanisms to reduce space occupation.
After the maintenance of the water turbine generator, the folding ladder is realized, reducing the occupation of wind tunnel passage space, and improving the safety and convenience of the maintenance process.
Smart Images
Figure CN223048740U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of the overhaul of hydro-generators, and particularly to a folding ladder for the overhaul of hydro-generators. Background Art
[0002] A hydro-generator refers to a generator that converts hydraulic energy into electrical energy with a water turbine as the prime mover. In order to ensure the stable operation of the generator, the generator needs to be overhauled regularly. And entering the inner air duct to overhaul many items such as the flexible connection and fixed parts of the generator is an essential link in the overhaul of the generator. In the related art, maintenance personnel generally enter the overhaul platform of the hydro-generator from the air duct by erecting a climbing ladder. However, after the overhaul of the generator is completed, due to the large volume and weight of the climbing ladder and the limited space inside the water turbine, there is a problem that it is inconvenient to transfer and store the climbing ladder after the overhaul of the generator. Content of the Utility Model
[0003] The purpose of the present disclosure is to provide a folding ladder for the overhaul of hydro-generators to solve the technical problems existing in the related art.
[0004] To achieve the above object, the present disclosure provides a folding ladder for the overhaul of hydro-generators, including:
[0005] Inner side plates, which are used for connecting with the side walls of the air duct of the hydro-generator;
[0006] Outer side plates;
[0007] A plurality of pedals, the first end of each pedal is hinged to the inner side plate, and the other end of each pedal is hinged to the outer side plate;
[0008] A driving mechanism, which is used for driving the plurality of pedals to rotate around the inner side plate, and for driving the outer side plate to rotate around the pedals;
[0009] A plurality of identification members, at least one of the identification members is arranged on each side surface of the pedal.
[0010] Optionally, the driving mechanism includes a plurality of first telescopic rods, the plurality of first telescopic rods are arranged at intervals along the length direction of the folding ladder, the first end of each first telescopic rod is connected to the inner side plate, and the second end of each first telescopic rod is connected to a pedal.
[0011] Optionally, the driving mechanism also includes two connecting parts and fasteners, the fasteners are used to fasten one of the connecting parts to the inner plate, and the fasteners are used to fasten the other connecting part to the pedal, the connecting part includes a connecting plate, a first hinge axis and two supporting ears, the two supporting ears are arranged opposite to each other on the connecting plate, the first hinge axis is connected between the two supporting ears, the first end of the first telescopic rod is hinged to one of the first hinge axis, and the second end of the first telescopic rod is hinged to the other first hinge axis.
[0012] Optionally, the driving mechanism further comprises a plurality of second telescopic rods, which are arranged at intervals along the length direction of the folding ladder, one end of each second telescopic rod is connected to the outer plate, and the second end of the second telescopic rod is connected to one of the pedals.
[0013] Optionally, a first end of each of the pedals is hinged to the top of the inner plate, and the other end of each of the pedals is hinged to the bottom of the outer plate.
[0014] Optionally, the folding ladder further comprises a second hinge shaft and a third hinge shaft, a first notch groove is formed on the top end surface of the inner side plate, a first protrusion block is formed on the first end of each of the pedals, the second hinge shaft is connected to two opposite side walls of the first notch groove, the first protrusion block is embedded in the first notch groove and hinged to the inner side plate through the second hinge shaft;
[0015] A second notch is formed on the bottom end surface of the outer plate, a second protrusion is formed at the second end of each pedal, the third hinge shaft is connected to two opposite side walls of the second notch, the second protrusion is embedded in the second notch and is hinged to the outer plate through the third hinge shaft.
[0016] Optionally, the folding ladder further comprises a railing, wherein the railing is connected to the outer side panel and is located on a side of the outer side panel facing away from the inner side panel.
[0017] Optionally, the railing is detachably connected to the outer panel.
[0018] Optionally, the railing includes a main body and a protruding section protruding from below the outer plate, so that when the driving mechanism drives the pedal to rotate to the unfolded state, the lowest point of the protruding section is at the same height as the lowest point of the inner plate.
[0019] With the above technical solution, since multiple pedals are all connected between the inner side plate and the outer side plate in a hinged manner, and the folding ladder further includes a driving mechanism, when the above water turbine generator needs to be overhauled, the driving mechanism connected between the pedal and the inner side plate can drive the pedal to rotate around the inner side plate and the outer side plate to rotate around the pedal, so that the inner side plate and the outer side plate are both perpendicular to the pedal, and the outer side plate can play a role in protecting the maintenance personnel to facilitate the maintenance personnel to climb; after the maintenance personnel have completed the maintenance, the driving mechanism can be used to drive the multiple pedals again, so that the pedal rotates around the inner side plate and the outer side plate rotates around the pedal. During the rotation of the pedal, the pedal gradually approaches the inner side plate, thereby reducing the space occupied by the pedal in its own length direction, and finally making the pedal and the outer side plate fit against the side wall of the wind tunnel passage, realizing the storage of the folding ladder, and reducing or avoiding the occupation of the space in the wind tunnel passage by the folding ladder, and facilitating the next maintenance use.
[0020] That is to say, through the driving of the pedal by the above driving mechanism, the pedal can be in an open state and a folded state. When the pedal is in the open state, the maintenance personnel can overhaul the water turbine generator by climbing the pedal. After the overhaul is completed, the folding operation of the pedal can be realized through the driving mechanism, and the storage of the pedal can be realized.
[0021] In addition, identification parts are respectively arranged on the two side surfaces of the pedal. In this way, no matter whether the pedal is in the folded state or the open state, at least one identification part can always be exposed outside the pedal, so as to facilitate the prompt and warning of the maintenance personnel and further reduce the safety hazards of the maintenance personnel during the maintenance process.
[0022] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings
[0023] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:
[0024] Figure 1 is a side view of a folding ladder provided by an exemplary embodiment of the present disclosure, wherein the folding ladder is in a folded state;
[0025] Figure 2 is a perspective view of a folding ladder provided by an exemplary embodiment of the present disclosure, wherein the folding ladder is in an unfolded state.
[0026] Description of the Reference Numerals
[0027] 1-folding ladder; 10-inner plate; 11-first notch; 20-outer plate; 21-second notch; 30-pedal; 31-first raised block; 32-second raised block; 40-driving mechanism; 41-first telescopic rod; 42-second telescopic rod; 50-connecting part; 70-rail; 71-main body; 72-protruding section; 80-installing hole; 90-identification part; 100-second hinge axis; 200-third hinge axis. DETAILED DESCRIPTION
[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0029] In the present disclosure, unless otherwise stated, the directional words such as "up", "down", "left", "right", etc. used to indicate directions or positional relationships are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation. Therefore, it cannot be understood as a limitation on the present disclosure. The terms "inside and outside" refer to the inside and outside of the corresponding structural contour.
[0030] In addition, "length direction" and "thickness direction" can be found in Figure 2 In the length direction and thickness direction shown. In addition, it should be noted that the terms used, such as "first", "second", etc., are used to distinguish one element from another element and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.
[0031] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0032] refer to Figures 1 to 2As shown in the figure, the present disclosure provides a folding ladder 1 for the maintenance of a hydrogenerator, which includes an inner side plate 10, an outer side plate 20, a driving mechanism 40, and a plurality of pedals 30. The inner side plate 10 is used to connect to the side wall of the air duct passage of the hydrogenerator. The first end of each pedal 30 is hinged to the inner side plate 10, and the other end of each pedal 30 is hinged to the outer side plate 20. The driving mechanism 40 is used to drive the plurality of pedals 30 to rotate around the inner side plate 10, and to drive the outer side plate 20 to rotate around the pedal 30, so as to drive the pedal 30, the inner side plate 10, and the outer side plate 20 to the unfolded state or drive the pedal 30, the inner side plate 10, and the outer side plate 20 to the folded state.
[0033] Through the above technical solution, since the plurality of pedals 30 are all connected between the inner side plate 10 and the outer side plate 20 in a hinged manner, and the folding ladder 1 further includes a driving mechanism 40. In this way, when it is necessary to maintain the above hydrogenerator, the driving mechanism 40 connected between the pedal 30 and the inner side plate 10 can drive the pedal 30 to rotate around the inner side plate 10 and the outer side plate 20 to rotate around the pedal 30, so that the inner side plate 10 and the outer side plate 20 are both perpendicular to the pedal 30 (that is, the inner side plate 10 and the outer side plate 20 are both in the unfolded state with the pedal 30), and the operator can climb, and the outer side plate 20 can play a role in protecting the maintenance personnel; when the maintenance personnel have completed the maintenance, the driving mechanism 40 can be used to drive the plurality of pedals 30 again, so that the pedal 30 rotates around the inner side plate 10 and the outer side plate 20 rotates around the pedal 30. During the rotation of the pedal 30, the pedal 30 gradually approaches the inner side plate 10, thereby reducing the space occupied by the pedal 30 in its own length direction, and finally making the pedal 30 and the outer side plate 20 fit against the side wall of the air duct passage (that is, the inner side plate 10 and the outer side plate 20 are both in the folded state with the pedal 30), realizing the storage of the folding ladder 1, and being able to reduce or avoid the occupation of the space in the air duct passage by the folding ladder 1, and being convenient for the next maintenance use.
[0034] That is to say, through the driving of the pedal 30 by the above driving mechanism 40, the pedal 30 can be in an open state and a folded state. When the pedal 30 is in the open state, the maintenance personnel can climb the pedal 30 to maintain the hydrogenerator. After the maintenance is completed, the folding operation of the pedal 30 can be realized through the driving mechanism 40, and the storage of the pedal 30 can be realized.
[0035] In addition, identification portions 90 are respectively provided on two side surfaces of the pedal 30. In this way, no matter whether the pedal 30 is in a folded state or an open state, at least one identification portion 90 can always be exposed outside the pedal 30, so as to facilitate prompting, guiding, and alerting maintenance personnel, thereby improving the concentration of maintenance personnel during the process of climbing the folding ladder 1 or walking in the wind tunnel passage, and further reducing the potential safety hazards of maintenance personnel during the maintenance process.
[0036] The above-mentioned identification portion 90 can be an arrow, a line, a character or an image, or can also be a specific structure such as a light or a buzzer. In short, as long as it can play a role in prompting and alerting the operating personnel, the present disclosure does not limit this.
[0037] It should be noted that the present disclosure does not limit the specific driving method and driving structure of the above-mentioned driving mechanism 40, as long as it can drive the pedal 30 and the outer plate 20. For example, as Figure 1 , Figure 2 shown, in an exemplary embodiment provided by the present disclosure, the driving mechanism 40 may include a plurality of first telescopic rods 41. The plurality of first telescopic rods 41 are arranged at intervals along the length direction of the folding ladder 1. The first end of each first telescopic rod 41 is connected to the inner plate 10, and the second end of each first telescopic rod 41 is connected to a pedal 30. In this way, when the first telescopic rod 41 extends, it can push the end of the pedal 30 away from the inner plate 10 to rotate in a direction away from the inner plate 10, thereby realizing the unfolding of the pedal 30. When the first telescopic rod 41 contracts, it can pull the end of the pedal 30 away from the inner plate 10 to rotate in a direction close to the inner plate 10, and finally fit on the side wall of the wind tunnel passage to realize the storage of the pedal 30.
[0038] Alternatively, in another embodiment provided by the present disclosure, the above-mentioned driving mechanism 40 can also be a structure of a cylinder or a linear motor.
[0039] To facilitate the connection between the first telescopic rod 41, the pedal 30, and the inner side plate 10, the driving mechanism 40 may further include two connecting parts 50 and fasteners (not shown). The fasteners are used to fasten one connecting part 50 to the inner side plate 10, and the fasteners are used to fasten the other connecting part 50 to the pedal 30. The connecting part 50 includes a connecting plate, a first hinge shaft, and two support ears. The two support ears are arranged opposite to each other on the connecting plate, and the first hinge shaft is connected between the two support ears. The first end of the first telescopic rod 41 is hinged to one first hinge shaft, and the second end of the first telescopic rod 41 is hinged to the other first hinge shaft. Since the two ends of the first telescopic rod 41 are respectively hinged to the first hinge shaft and the second hinge shaft 100, in this way, during the telescopic process of the first telescopic rod 41, the two ends of the first telescopic rod 41 can rotate around the first hinge shaft and the second hinge shaft 100 respectively, thereby avoiding interference and pulling at the connection between the first telescopic rod 41, the pedal 30, and the inner side plate 10 during the telescopic process of the first telescopic rod 41, reducing the torsional force during the telescopic process of the first telescopic rod 41, and facilitating the telescopic operation of the first telescopic rod 41.
[0040] Similarly, as Figure 1 shown, the driving mechanism 40 may further include a plurality of second telescopic rods 42. The plurality of second telescopic rods 42 are arranged at intervals along the length direction of the folding ladder 1. One end of each second telescopic rod 42 is connected to the outer side plate 20, and the second end of the second telescopic rod 42 is connected to a pedal 30. In this way, when the second telescopic rod 42 extends, it can push the end of the outer side plate 20 away from the inner side plate 10 to rotate in a direction away from the inner side plate 10, thereby realizing the unfolding of the pedal 30 and playing a protective role for the maintenance personnel climbing on the pedal 30. When the second telescopic rod 42 contracts, it can pull the end of the outer side plate 20 away from the pedal 30 to rotate in a direction close to the inner side plate 10 and finally fit on the side wall of the wind tunnel channel, realizing the storage of the outer side plate 20.
[0041] It should be noted that, as Figure 1 shown, the second end of the second telescopic rod 42 connected to the pedal 30 and the second end of the first telescopic rod 41 connected to the pedal 30 are respectively located on two sides of the pedal 30. In this way, when the first telescopic rod 41 and the second telescopic rod 42 are telescoped synchronously, the folding ladder 1 can have an unfolded state and a folded state.
[0042] Similarly, the two ends of the above-mentioned second telescopic rod 42 can also be connected to the pedal 30 and the outer side plate 20 by means of hinges, which will not be elaborated in this disclosure.
[0043] Optionally, as Figure 1 、 Figure 2As shown, the first end of each pedal 30 is hinged to the top of the inner plate 10, and the other end of each pedal 30 is hinged to the bottom of the outer plate 20. That is to say, the inner plate 10, the pedal 30 and the outer plate 20 can be jointly formed into a Z-shape, so that the connection between the inner plate 10 and the side wall of the wind tunnel passage is located below the pedal 30, so it will not affect the up and down operation of the maintenance personnel, and the outer plate 20 is connected above the pedal 30, that is, the outer plate 20 can be jointly surrounded with the side wall of the wind tunnel passage to form an enclosure for the maintenance personnel to walk, further improving the safety of the maintenance personnel in the up and down process.
[0044] Optionally, in order to further facilitate the unfolding and folding operations of the folding ladder 1, in an exemplary embodiment provided in the present disclosure, as Figure 2 As shown, the folding ladder 1 can also include a second hinge axis 100 and a third hinge axis 200, a first notch groove 11 is formed on the top end surface of the inner side plate 10, a first protrusion block 31 is formed at the first end of each pedal 30, the second hinge axis 100 is connected to two opposite side walls of the first notch groove 11, the first protrusion block 31 is embedded in the first notch groove 11 and is hinged to the inner side plate 10 through the second hinge axis 100; similarly, a second notch groove 21 is formed on the bottom end surface of the outer side plate 20, a second protrusion block 32 is formed at the second end of each pedal 30, the third hinge axis 200 is connected to two opposite side walls of the second notch groove 21, the second protrusion block 32 is embedded in the second notch groove 21 and is hinged to the outer side plate 20 through the third hinge axis 200. In this way, when the above-mentioned driving mechanism 40 drives the pedal 30 to rotate around the inner plate 10, the first protrusion block 31 formed at the first end of the pedal 30 can rotate around the second hinge shaft 100 connected to the first notch groove 11, and, as the pedal 30 rotates, the first protrusion block 31 can gradually embed into the first notch groove 11 or gradually escape from the first notch groove 11 until the pedal 30 is in a fully open state or a stored state. It should be noted that when the pedal 30 is in the stored state, the pedal 30 is in contact with the side wall of the wind tunnel channel, and the first protrusion block 31 is completely embedded in the first notch groove 11. At this time, the side surface of the pedal 30 is coplanar with the side surface of the inner plate 10, and together they form a plane.
[0045] Similarly, when the outer plate 20 rotates around the pedal 30, the second protrusion block 32 can be embedded in the second notch groove 21 or removed from the second notch groove 21 until the outer plate 20 is in a fully open state or a retracted state. When the outer plate 20 is in the retracted state, the second protrusion block 32 is completely embedded in the second notch groove, and the outer plate 20 is in contact with the side wall of the wind tunnel channel. At this time, the side surface of the outer plate 20 is coplanar with the side surface of the pedal 30, and together they form a plane.
[0046] Alternatively, if Figure 1 , Figure 2As shown, the inner plate 10 also has a plurality of mounting holes 80, which are arranged at intervals along the length direction of the inner plate 10 and penetrate the inner plate 10 along the thickness direction of the inner plate 10. In this way, the inner plate 10 can be directly fastened to the side wall of the wind tunnel passage by means of fastening structures such as screws and expansion screws. On the one hand, there is no need to set other related structures for supporting and fixing the folding ladder 1 in the wind tunnel passage. On the other hand, this fastening method can also improve the firmness and stability of the folding ladder 1 and the wind tunnel passage, and prevent the operator from falling due to the shaking or sliding of the folding ladder 1 when climbing the folding ladder 1.
[0047] Alternatively, if Figure 1 , Figure 2 As shown, the folding ladder 1 may further include a railing 70, which is connected to the outer plate 20 and is located on the side of the outer plate 20 away from the inner plate 10. The railing 70 disposed on the outer side of the outer plate 20 can further protect the maintenance personnel and reduce the safety hazards of the maintenance personnel during the climbing process.
[0048] In an exemplary embodiment provided by the present disclosure, the handrail 70 and the outer plate 20 can be connected in a detachable manner, such as by snap connection, fastener connection, etc., and the handrail 70 can be connected in a detachable manner, which is also convenient for the hoisting (disassembly and subsequent hoisting), replacement and maintenance of the folding ladder 1.
[0049] Alternatively, the railing 70 and the outer panel 20 may also be connected by a non-detachable method such as welding, riveting, or integral molding. This method can make the connection between the railing 70 and the outer panel 20 have a higher strength.
[0050] Alternatively, if Figure 1 , Figure 2 As shown, the handrail 70 includes a body 71 and a protruding section 72 protruding from the bottom of the outer plate 20, so that when the driving mechanism 40 drives the pedal 30 to rotate to the unfolded state, the lowest point of the protruding section 72 is at the same height as the lowest point of the inner plate 10. In this way, when the driving mechanism 40 drives the inner plate 10, the pedal 30 and the outer plate 20 to the unfolded state, since the lowest point of the protruding section 72 is at the same height as the lowest point of the inner plate 10, the protruding section 72 (equivalent to the supporting leg) and the inner plate 10 can support the pedal 30 from both sides of the pedal 30 at the same time, thereby sharing the pressure of the inner plate 10, and further improving the stability and firmness of the folding ladder 1 during use.
[0051] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0052] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.
[0053] Furthermore, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.
Claims
1. A folding ladder for maintenance of a hydro-generator, characterized in that: include: An inner plate, used for connecting with the side wall of the wind tunnel passage of the hydro-generator; Outer side panels; A plurality of pedals, wherein a first end of each of the pedals is hinged to the inner plate, and another end of each of the pedals is hinged to the outer plate; A driving mechanism, the driving mechanism is used to drive the plurality of pedals to rotate around the inner plate, and is used to drive the outer plate to rotate around the pedals; A plurality of identification members, at least one of which is disposed on each side of the pedal.
2. The folding ladder for repairing a hydro-generator according to claim 1 is characterized in that: The driving mechanism comprises a plurality of first telescopic rods, which are arranged at intervals along the length direction of the folding ladder, a first end of each of the first telescopic rods is connected to the inner side plate, and a second end of each of the first telescopic rods is connected to one of the pedals.
3. The folding ladder for repairing a hydro-generator according to claim 2 is characterized in that: The driving mechanism also includes two connecting parts and fasteners, the fasteners are used to fasten one of the connecting parts to the inner plate, and the fasteners are used to fasten the other connecting part to the pedal, the connecting part includes a connecting plate, a first hinge shaft and two supporting ears, the two supporting ears are arranged opposite to each other on the connecting plate, the first hinge shaft is connected between the two supporting ears, the first end of the first telescopic rod is hinged to one of the first hinge shafts, and the second end of the first telescopic rod is hinged to the other of the first hinge shafts.
4. The folding ladder for repairing a hydro-generator according to claim 1 is characterized in that: The driving mechanism also includes a plurality of second telescopic rods, which are arranged at intervals along the length direction of the folding ladder, one end of each second telescopic rod is connected to the outer plate, and the second end of the second telescopic rod is connected to one of the pedals.
5. The folding ladder for repairing a hydro-generator according to any one of claims 1 to 4, characterized in that: A first end of each of the pedals is hinged to the top of the inner plate, and another end of each of the pedals is hinged to the bottom of the outer plate.
6. The folding ladder for repairing a hydro-generator according to any one of claims 1 to 4, characterized in that: The folding ladder further comprises a second hinge shaft and a third hinge shaft, a first notch groove is formed on the top end surface of the inner side plate, a first protrusion block is formed on the first end of each of the steps, the second hinge shaft is connected to two opposite side walls of the first notch groove, the first protrusion block is embedded in the first notch groove and is hinged to the inner side plate through the second hinge shaft; A second notch is formed on the bottom end surface of the outer plate, a second protrusion is formed at the second end of each pedal, the third hinge shaft is connected to two opposite side walls of the second notch, the second protrusion is embedded in the second notch and is hinged to the outer plate through the third hinge shaft.
7. The folding ladder for repairing a hydro-generator according to any one of claims 1 to 4, characterized in that: The inner plate also has a plurality of mounting holes, which are arranged at intervals along the length direction of the inner plate and penetrate the inner plate along the thickness direction of the inner plate itself.
8. The folding ladder for repairing a hydro-generator according to any one of claims 1 to 4, characterized in that: The folding ladder further comprises a handrail, which is connected to the outer side plate and is located at a side of the outer side plate facing away from the inner side plate.
9. The folding ladder for repairing a hydro-generator according to claim 8, characterized in that: The railing is detachably connected to the outer side plate.
10. The folding ladder for repairing a hydro-generator according to claim 8, characterized in that: The railing includes a main body and a protruding section protruding from the bottom of the outer plate, so that when the driving mechanism drives the pedal to rotate to the unfolded state, the lowest point of the protruding section is at the same height as the lowest point of the inner plate.