Hidden folding type maintenance stool for electrical panel cabinet

Abstract

The invention discloses an electrical panel cabinet hidden folding type maintenance stool, and relates to the technical field of maintenance stools, the electrical panel cabinet hidden folding type maintenance stool comprises a support frame, the outer side of the support frame is provided with a folding mechanism, the bottom of the support frame is provided with a mounting mechanism, and the top of the support frame is fixedly connected with a support column; the folding mechanism comprises a fixing seat which is fixedly connected to the right side of the supporting column. According to the hidden folding type maintenance stool for the electrical panel cabinet, it is ensured that the working platform has enough rigidity and bearing capacity after being unfolded, safe and reliable standing posture working conditions are provided for workers, and the risks of slipping and falling caused by using temporary heightening objects or tiptoeing operation are fundamentally eradicated. And after the operation is finished, the telescopic rod retracts to drive the maintenance stool body to be synchronously and stably folded, so that the maintenance stool body is tightly folded to the side of the support frame, the idle volume of the device is greatly reduced, the device is convenient to move and store in a plate cabinet group, and the high space adaptability and the operation safety are embodied.

Description

Technical Field

[0001] This invention relates to the field of maintenance stool technology, and in particular to a concealed folding maintenance stool for electrical control panels. Background Technology

[0002] As a key control and protection node in the power system, electrical control panels require regular inspection, testing, and maintenance of their internal components, such as circuit breakers, relays, instruments, and terminals, to ensure the long-term stable and reliable operation of the system. When working on components in the upper or top parts of the control panel, maintenance personnel often need to be at a certain height, and currently, it is common practice to rely on carrying a separate maintenance stool (or ladder stool) to the site.

[0003] However, this type of stool, independent of the control panel, has revealed many increasingly prominent limitations, inconveniences, and safety hazards in practical applications: First, it has poor portability. Common maintenance stools have a certain size and weight to ensure stability. It is quite strenuous for maintenance personnel (especially when they need to carry tools and instruments at the same time) to move it back and forth between different control panels or work points, resulting in low work efficiency when multiple points and continuous maintenance are required. Second, it causes serious space interference problems. In substation equipment areas, power distribution rooms, and other places, safe operating passages are usually reserved in front of and behind control panels, but the space itself is relatively limited. Temporarily placed maintenance stools will crowd out the already narrow passages, not only hindering the passage of other personnel, but also making it easy for the stool legs to collide and interfere with cables, trench covers, or other equipment bases on the ground, posing a tripping hazard and potentially damaging precision cables. Third, there are significant safety risks. In situations where space is extremely limited or the ground is uneven, making it impossible to place the maintenance stools stably, maintenance personnel may be forced to risk using unstable temporary objects such as toolboxes or equipment packaging boxes to elevate themselves, or to work on tiptoe. These actions greatly increase the risk of slipping, falling, and injury, constituting a serious safety hazard for working at heights. Fourth, management and storage are inconvenient. A large number of individual stools require a dedicated warehouse for storage during non-maintenance periods, which can easily lead to confusion, loss, or damage, and also increase storage costs.

[0004] In summary, the existing model is no longer sufficient to meet the demands of efficient, safe, and standardized modern power operation and maintenance. Therefore, the industry urgently needs an innovative solution that can fundamentally change this situation: developing an embedded or attached maintenance auxiliary lifting device that can be easily integrated with the control panel, requires no additional passageway space, has a high degree of integration, is safe and reliable to use, and is easy to manage. This would improve work efficiency, eliminate safety hazards, and achieve centralized management of operation and maintenance tools. Summary of the Invention

[0005] The purpose of this invention is to provide a concealed folding maintenance stool for electrical control panels to solve the problems mentioned in the background art.

[0006] This invention is achieved through the following scheme: A concealed folding maintenance stool for electrical control panels includes a support frame, a folding mechanism on the outside of the support frame, an installation mechanism at the bottom of the support frame, and a support column fixedly connected to the top of the support frame, integrating the functions of a folding stool and installation into one unit. Its advantages lie in achieving a fixed connection between the maintenance stool and the electrical control panel, fundamentally avoiding the hassle of moving the stool separately; at the same time, the integrated design significantly reduces the space and management costs required for separate stool storage, providing a readily available and conveniently stored dedicated auxiliary access solution for control panel maintenance. The folding mechanism includes a fixed base, which is fixedly connected to the right side of the support column. A telescopic rod is provided inside the fixed base. A connecting seat is rotatably connected to one end of the telescopic rod. A support arm is fixedly connected to one end of the connecting seat. A support arm is fixedly connected to the top of the support arm. An inspection stool body is fixedly connected to the inside of the support arm. A support base is fixedly connected to the top of the support frame.

[0007] Preferably, a short shaft is fixedly connected inside the support arm, and the short shaft is rotatably connected to the inside of the support base. The short shaft enables the rotational connection between the support arm and the support base, forming the core rotating joint of the folding mechanism. Its advantages include providing a stable and reliable rotational fulcrum for the unfolding and folding of the inspection stool body, ensuring the certainty of the movement trajectory. Furthermore, the shaft connection structure is simple, has strong load-bearing capacity, and is conducive to long-term reliable use.

[0008] Preferably, a second short shaft is fixedly connected inside the second support arm, and the second short shaft is rotatably connected to the inner side of the support base. By adding the second short shaft, the second support arm and the support base are independently rotatably connected, forming an approximately parallelogram-shaped linkage mechanism together with the first short shaft. Its beneficial effect is that it ensures the maintenance bench body maintains a roughly horizontal posture throughout its unfolding and folding processes, greatly improving the stability of the unfolding process and the safety of use after positioning, thus avoiding the risk of platform tilting.

[0009] Preferably, two support arms are provided, and each support arm is fixedly connected to a handle at its bottom. The advantages of adopting a double support arm structure with handles are as follows: First, the double-arm structure significantly improves the load-bearing stability and lateral force resistance of the folding mechanism and the maintenance stool body; second, the handles provide operators with additional force points, which can be used for manual emergency operation in case of electric drive failure, and can also assist in applying force and guidance during unfolding or folding, thus improving the convenience of operation and human-machine interface.

[0010] Preferably, the installation mechanism includes a plug block, which is fixedly connected to the bottom of the support frame. A mounting seat is movably connected to the outside of the plug block. A support block is fixedly connected to the top of the support frame. A threaded rod is rotatably connected inside the support block. A threaded plate is threadedly connected to the outer wall of the threaded rod. A support frame is fixedly connected to the bottom of the threaded plate. A locking block is fixedly connected inside the support frame. A support plate is fixedly connected to the bottom of the support frame. A limit plate is fixedly connected inside the support plate. The plug block and the mounting seat cooperate to achieve initial quick connection. Then, the locking block is driven by the threaded rod to achieve final mechanical locking, forming a two-step installation method of "first positioning, then locking". The operation logic is clear. The entire mechanism structure is stable, all of which are mechanical components, with high reliability and simple maintenance. It can effectively resist vibration and load during use and ensure the absolute firmness of the connection between the device and the cabinet.

[0011] Preferably, the threaded plate has a sliding opening inside, and the threaded plate is slidably connected to the outside of the limiting plate through the sliding opening. The sliding engagement between the sliding opening and the limiting plate constitutes a guiding and limiting mechanism for the threaded plate. Its beneficial effect is that it precisely constrains the threaded plate to move only in a straight line along the limiting plate, effectively preventing the threaded plate from rotating or shifting when the threaded rod rotates. This ensures that the locking block can be accurately aligned and inserted into the target slot, improving the success rate and reliability of the locking action.

[0012] Preferably, the support frame has a movable opening at its top, through which the threaded plate passes and moves. The advantage of this is that it provides the necessary space for the threaded plate and its connecting components to move up and down. Simultaneously, the edge of the movable opening can assist in limiting the movement path of the threaded plate, further enhancing movement stability. Furthermore, it allows the entire drive locking mechanism to be compactly integrated into the support frame structure, resulting in a neat appearance and avoiding interference or safety hazards caused by protruding components.

[0013] Preferably, the threads on the outer walls of the two ends of the threaded rod are in opposite directions, and a handwheel is fixedly connected to the front end of the threaded rod. This design employs a bidirectional threaded rod with opposite thread directions at both ends and a handwheel. The advantage is that the operator only needs to rotate the handwheel in one direction to drive the two threaded plates to move synchronously in opposite directions via the bidirectional threads, thereby achieving synchronous locking or unlocking of the two locking blocks. The operation is extremely labor-saving, efficient, and symmetrical. The handwheel provides a good operating lever arm, allowing for easy operation even under high locking force requirements.

[0014] Preferably, both the support base and the support column have rotating holes inside, through which the threaded rod passes and rotates. These rotating holes serve as additional support points for the threaded rod. The advantages are that they provide multi-point support for long-span threaded rods, significantly reducing bending and deflection caused by the rod's own weight and operating force, ensuring smooth rotation, reducing friction and wear, thereby extending the service life of the entire locking mechanism, and ensuring the accuracy of the locking action after long-term use. Preferably, the mounting base has an opening on its outer side, and the support column mounting mechanism has a latch on its outer side. The latching block passes through the opening and is movably connected to the inner wall of the latch, clearly defining the cooperation relationship between the opening on the mounting base, the latch on the insert block, and the latching block. Its beneficial effect is that the latching block, as the final locking actuator, passes through both the mounting base and the insert block, structurally achieving a series lock-in of the support frame, insert block, and mounting base, forming a reliable anti-derailment mechanical interlock. This design allows the connection point to withstand forces in multiple directions, greatly enhancing the rigidity and stability of the overall connection and ensuring the safety of high-altitude operations.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This concealed folding maintenance bench for electrical control panels utilizes an optimized folding mechanism to achieve smooth and safe unfolding and folding within a limited space. Specifically, the telescopic rod drives the support arm to rotate around its short axis via a connecting seat, while the other support arm rotates around the same short axis in a coordinated manner. This allows the maintenance bench to unfold smoothly along a predetermined trajectory to a stable state suitable for working at height. This structure ensures sufficient rigidity and load-bearing capacity of the work platform after unfolding, providing workers with safe and reliable standing working conditions and fundamentally eliminating the risks of slipping and falling caused by using temporary platforming or tiptoeing. After work is completed, the extension of the telescopic rod causes the maintenance bench to fold smoothly and synchronously, tightly folding it to the side of the support frame. This significantly reduces the unused volume of the device, facilitating its movement and storage within a group of control panels, demonstrating high spatial adaptability and operational safety.

[0016] 2. This concealed folding maintenance bench for electrical control panels achieves a quick and stable connection between the bench and the control panel through an integrated mounting mechanism within the support frame. Specifically, the pre-installed mounting base works in conjunction with the support frame featuring insert blocks. Rotating the handwheel drives a bidirectional threaded rod, which in turn moves the threaded plates on both sides and the support frame synchronously, allowing the insert blocks to precisely engage with their slots, thus achieving mechanical interlocking. This design eliminates the cumbersome process of moving a separate maintenance bench, significantly improving the efficiency of maintenance preparation. Simultaneously, the device directly utilizes the control panel itself as a support foundation, without occupying additional ground safety passage space, completely avoiding the risk of interference between the bench legs and ground cables, trenches, or other equipment, ensuring a clean working environment and smooth passage. Furthermore, the mounting mechanism also supports rapid reverse disassembly, enabling convenient storage and reuse of the device, facilitating intensive tool management and reducing storage costs. Attached Figure Description

[0017] Figure 1 This is a front view of the structure of the present invention; Figure 2 This is a bottom view of the structure of the present invention; Figure 3 This is a right view of the structure of the present invention; Figure 4 This is a left view of the structure of the present invention; Figure 5 This is a structural diagram of the inspection bench body; Figure 6 This is a schematic diagram showing the positions of minor axis one and minor axis two in this invention; Figure 7 This is an enlarged structural schematic diagram of the mounting mechanism in this invention; Figure 8 This is a schematic diagram of the mounting base in this invention; Figure 9 This is a schematic diagram of the insert block in this invention; In the diagram: 1. Support frame; 2. Support column; 3. Folding mechanism; 31. Fixed seat; 32. Telescopic rod; 33. Connecting seat; 34. Support arm one; 35. Support arm two; 36. Inspection stool body; 37. Support seat; 38. Short shaft one; 39. Short shaft two; 4. Installation mechanism; 41. Mounting seat; 42. Insert block; 43. Support block; 44. Threaded rod; 45. Threaded plate; 46. Support frame; 47. Locking block; 48. Support plate; 49. Limiting plate; 410. Sliding port; 411. Moving port; 412. Handwheel; 413. Rotary hole; 414. Through port; 415. Bay. Detailed Implementation

[0018] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0021] 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 technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0022] Example 1 like Figures 1-9 As shown, the present invention provides a technical solution: A concealed folding maintenance stool for electrical control panels includes a support frame 1, a folding mechanism 3 on the outside of the support frame 1, an installation mechanism 4 at the bottom of the support frame 1, and a support column 2 fixedly connected to the top of the support frame 1, integrating the functions of a folding stool and installation into one unit. Its advantages lie in achieving a fixed connection between the maintenance stool and the electrical control panel, fundamentally avoiding the hassle of moving the stool separately; at the same time, the integrated design significantly reduces the space and management costs required for separate stool storage, providing a readily available and conveniently stored dedicated auxiliary climbing solution for control panel maintenance. The folding mechanism 3 includes a fixed base 31, which is fixedly connected to the right side of the support column 2. A telescopic rod 32 is provided inside the fixed base 31. One end of the telescopic rod 32 is rotatably connected to a connecting seat 33. One end of the connecting seat 33 is fixedly connected to a support arm 34. A support arm 35 is fixedly connected to the top of the support arm 34. The maintenance stool body 36 is fixedly connected to the inside of the support arm 35. A support seat 37 is fixedly connected to the top of the support frame 1.

[0023] Furthermore, a short shaft 38 is fixedly connected inside the support arm 34. The short shaft 38 is rotatably connected to the inside of the support base 37. The short shaft 38 realizes the rotatable connection between the support arm 34 and the support base 37, forming the core rotating joint of the folding mechanism. Its beneficial effect is that it provides a stable and reliable rotational fulcrum for the unfolding and folding of the maintenance stool body, ensuring the certainty of the movement trajectory. At the same time, the shaft connection structure is simple, has a strong load-bearing capacity, and is conducive to long-term reliable use.

[0024] Furthermore, a short shaft 39 is fixedly connected inside the second support arm 35. The short shaft 39 is rotatably connected to the inside of the support base 37. By adding the short shaft 39, the second support arm 35 and the support base 37 can be independently rotatably connected. Together with the first short shaft 38, they form an approximately parallelogram-shaped linkage mechanism. Its beneficial effect is that it allows the maintenance stool body to maintain a roughly horizontal posture throughout the unfolding and folding process, greatly improving the stability of the unfolding process and the safety of use after positioning, and avoiding the risk of platform tilting.

[0025] Furthermore, there are two support arms 34, each with a handle fixedly connected to its bottom. The advantages of using a double support arm 34 structure with handles are as follows: First, the double-arm structure significantly improves the load-bearing stability and lateral force resistance of the folding mechanism and the maintenance stool body. Second, the handles provide operators with additional force points, allowing for manual emergency operation in case of electric drive failure, as well as assisting in force application and guidance during unfolding or folding, thus improving operational convenience and human-machine interface.

[0026] Furthermore, the installation mechanism 4 includes a plug 42, which is fixedly connected to the bottom of the support frame 1. A mounting base 41 is movably connected to the outside of the plug 42. A support block 43 is fixedly connected to the top of the support frame 1. A threaded rod 44 is rotatably connected inside the support block 43. A threaded plate 45 is threadedly connected to the outer wall of the threaded rod 44. A support frame 46 is fixedly connected to the bottom of the threaded plate 45. A locking block 47 is fixedly connected inside the support frame 46. A support plate 48 is fixedly connected to the bottom of the support frame 1. A limit plate 49 is fixedly connected inside the support plate 48. The plug 42 and the mounting base 41 cooperate to achieve initial quick connection. Then, the threaded rod 44 drives the locking block 47 to achieve final mechanical locking, forming a two-step installation method of "first positioning, then locking". The operation logic is clear. The entire mechanism structure is stable, all of which are mechanical components, with high reliability and simple maintenance. It can effectively resist vibration and load during use and ensure the absolute firmness of the connection between the device and the cabinet.

[0027] Furthermore, the threaded plate 45 has a sliding opening 410 inside. The threaded plate 45 is slidably connected to the outside of the limiting plate 49 through the sliding opening 410. The sliding engagement between the sliding opening 410 and the limiting plate 49 constitutes a guiding and limiting mechanism for the threaded plate. Its beneficial effect is that it precisely constrains the threaded plate to only move in a straight line along the limiting plate, effectively preventing the threaded plate from rotating or shifting when the threaded rod rotates. This ensures that the locking block can be accurately aligned and inserted into the target locking slot 415, improving the success rate and reliability of the locking action.

[0028] Furthermore, a movable opening 411 is provided at the top of the support frame 1, through which the threaded plate 45 passes and moves. The movable opening 411 at the top of the support frame allows the threaded plate to pass through. Its advantages are that it provides the necessary space for the up-and-down movement of the threaded plate and its connecting components. Simultaneously, the edge of the movable opening 411 can assist in limiting the movement path of the threaded plate, further enhancing movement stability. Moreover, it allows the entire drive locking mechanism to be compactly integrated into the support frame structure, resulting in a neat appearance and avoiding interference or safety hazards caused by protruding components.

[0029] Furthermore, the threads on the outer walls of the threaded rod 44 are in opposite directions at both ends, and a handwheel 412 is fixedly connected to the front end of the threaded rod 44. This design utilizes a bidirectional threaded rod with opposite thread directions at both ends, coupled with the handwheel 412. The advantage is that the operator only needs to rotate the handwheel 412 in one direction to drive the two threaded plates to move synchronously towards or away from each other via the bidirectional threads, thereby achieving synchronous locking or unlocking of the two locking blocks. The operation is extremely labor-saving, efficient, and symmetrical. The handwheel 412 provides a good operating lever arm, allowing for easy operation even under conditions requiring a large locking force.

[0030] Furthermore, both the support base 37 and the support column 2 have rotating holes 413 inside, through which the threaded rod 44 passes and rotates. The rotating holes 413 inside the support base and support column serve as additional support points for the threaded rod. The beneficial effect is that it provides multi-point support for the long-span threaded rod, significantly reducing the bending and deflection that may occur due to its own weight and operating force, ensuring smooth rotation, reducing friction and wear, thereby extending the service life of the entire locking mechanism, and ensuring the accuracy of the locking action after long-term use. Furthermore, the mounting base 41 has a through-hole 414 on its outer side, and the support column 2 mounting mechanism 4 has a latch 415 on its outer side. A latching block 47 passes through the through-hole 414 and is movably connected to the inner wall of the latch 415, clearly defining the cooperative relationship between the through-hole 414 on the mounting base, the latch 415 on the insert block 42, and the latching block. Its beneficial effect is that the latching block, as the final locking actuator, passes through both the mounting base and the insert block, structurally achieving a series-locked connection between the support frame, the insert block, and the mounting base, forming a reliable anti-derailment mechanical interlock. This design allows the connection point to withstand forces in multiple directions, greatly enhancing the rigidity and stability of the overall connection and ensuring the safety of high-altitude operations.

[0031] I. Working Principle of the Installation and Fixing Mechanism The purpose of this mechanism is to achieve a quick and secure connection between the main body of the maintenance bench and the door of the electrical control panel. Its operation involves a two-step process, from initial positioning to final mechanical locking: Preliminary Positioning and Suspension: First, the mounting base 41 is pre-fixed to a predetermined position inside the cabinet door. During installation, the operator holds the support frame 1, aligns the bottom insert 42 with it, and inserts it into the guide groove or cavity of the mounting base 41. This step relies on the cooperation between the insert 42 and the inside of the mounting base 41 to achieve the initial suspension and support of the device, providing a foundation for subsequent reinforcement.

[0032] Mechanical reinforcement and locking: After initial suspension, the core locking operation is performed. Rotating the drive handwheel 412 causes the threaded rod 44, which is fixed to it, to rotate within the support block 43. Since the threads at both ends of the threaded rod 44 have opposite directions and form a threaded pair with the threaded plates 45 on both sides, and the threaded plates 45 are constrained by the limiting plate 49 and can only slide linearly, the rotational motion of the threaded rod 44 is synchronously converted into the opposing linear motion of the two threaded plates 45. The threaded plates 45 drive the lower support frame 46 and the locking block 47 fixed thereon to move horizontally. The locking block 47 passes through the through-hole 414 on the side wall of the mounting base 41 and finally precisely inserts into the pre-opened slot 415 on the side of the insert 42. This design forms a robust lateral mechanical interlock, "locking" the insert 42 in the mounting base 41, effectively resisting any shaking or disengagement forces that may occur during use, ensuring the integrity and reliability of the connection. During disassembly, rotating the handwheel 412 in the opposite direction will cause the locking block 47 to exit the bayonet 415, thereby unlocking the device. The entire disassembly and assembly process is efficient and labor-saving.

[0033] II. Working Principle of the Climbing and Folding Mechanism This organization is responsible for ensuring a smooth and safe transition of the maintenance bench body 36 from its folded state to its unfolded working state.

[0034] Power drive and motion transmission: When working at height, the telescopic boom 32 is typically activated by a controllable linear actuator such as an electric push rod or a gas spring. The piston rod of the telescopic boom 32 extends, pushing the connecting seat 33 hinged at its end. The connecting seat 33 is fixedly connected to the support arm 34, thereby transmitting the linear thrust to the support arm 34.

[0035] Linkage Deployment and Platform Positioning: Support arm 34 is hinged to support base 37 via its internal short shaft 38. Therefore, under the action of thrust, support arm 34 begins to rotate outward and downward around the axis of short shaft 38. Simultaneously, support arm 35 is also hinged to support base 37 via short shaft 39 and fixed to the maintenance bench body 36. Support arm 34, support arm 35, maintenance bench body 36, and support base 37 together form a stable linkage mechanism similar to a parallelogram or four-bar linkage. Under the continuous push of telescopic rod 32, this linkage mechanism moves in concert, causing the maintenance bench body 36 to smoothly unfold from a vertically folded state tightly against support column 2 and finally position itself in a horizontal position suitable for personnel to stand and work. The entire deployment process is controllable, smooth, and stable.

[0036] Folding and storage: After maintenance is completed, the telescopic rod 32 is retracted. Through the reverse movement of the linkage mechanism, the maintenance stool body 36 and support arm 1 34 and support arm 2 35 are pulled to rotate upward and inward simultaneously, and finally completely folded back to their original position, closely fitting the side of the support frame 1. This greatly reduces the space occupied by the device when it is not in use, and makes it easy to move or store in a compact power distribution room environment.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concealed folding maintenance stool for electrical control panels, comprising a support frame (1), characterized in that: The support frame (1) is provided with a folding structure (3), the bottom of the support frame (1) is provided with an installation mechanism (4), and the top of the support frame (1) is fixedly connected with a support column (2); the folding mechanism (3) can be unfolded into a pedal structure when driven, and the installation mechanism (4) is provided with a screw structure and a clamping structure. The clamping structure is fixed to the cabinet door to be fixed under the action of the screw structure.

2. The concealed folding maintenance stool for electrical control panels as described in claim 1, characterized in that: The folding mechanism (3) includes a fixed seat (31), which is connected to a support column (2). A telescopic rod (32) is provided on the fixed seat (31). A connecting seat (33) is rotatably connected to one end of the telescopic rod (32). A support arm (34) is connected to one end of the connecting seat (33). A support arm (35) is connected to the support arm (34). The support arm (35) is connected to the inspection stool body (36). A support seat (37) is connected to the top of the support frame (1).

3. The concealed folding maintenance stool for electrical control panels as described in claim 2, characterized in that: The first support arm (34) is fixedly connected to a short shaft (38), which is rotatably connected to the inside of the support base (37); the second support arm (35) is fixedly connected to a short shaft (39), which is rotatably connected to the inside of the support base (37).

4. The concealed folding maintenance stool for electrical control panels as described in claim 3, characterized in that: There are two support arms (34), and each of the two support arms (34) has a handle fixedly connected to its bottom.

5. A concealed folding maintenance stool for electrical control panels as described in any one of claims 1 to 4, characterized in that: The installation mechanism (4) includes a plug (42), which is connected to the bottom of the support frame (1). A mounting seat (41) is movably connected to the outside of the plug (42). A support block (43) is fixedly connected to the top of the support frame (1). A threaded rod (44) is rotatably connected inside the support block (43). A threaded plate (45) is threadedly connected to the outer wall of the threaded rod (44). A support frame (46) is connected to the bottom of the threaded plate (45). A locking block (47) is connected inside the support frame (46). A support plate (48) is connected to the bottom of the support frame (1). A limit plate (49) is fixedly connected inside the support plate (48).

6. The concealed folding maintenance stool for electrical control panels according to claim 5, characterized in that: The threaded plate (45) has a sliding opening (410) inside, and the threaded plate (45) is slidably connected to the outside of the limiting plate (49) through the sliding opening (410).

7. The concealed folding maintenance stool for electrical control panels according to claim 5, characterized in that: The support frame (1) has a movable opening (411) at the top, and the threaded plate (45) passes through the movable opening (411) and moves.

8. The concealed folding maintenance stool for electrical control panels according to claim 5, characterized in that: The threads on the outer walls of the two ends of the threaded rod (44) are in opposite directions, and a handwheel (412) is fixedly connected to the front end of the threaded rod (44).

9. The concealed folding maintenance stool for electrical control panels according to claim 5, characterized in that: Both the support base (37) and the support column (2) have a rotating hole (413) inside, through which the threaded rod (44) rotates.

10. The concealed folding maintenance stool for electrical control panels according to claim 5, characterized in that: The mounting base (41) has an opening (414) on its outer side, and the support column (2) mounting mechanism (4) has a slot (415) on its outer side. The locking block (47) passes through the opening (414) and is movably connected to the inner wall of the slot (415).

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