A smart elevator pit entry and exit device

Abstract

This invention relates to an intelligent elevator pit entry and exit device. The intelligent elevator pit entry and exit device includes a foot guard, a ladder, a drive assembly, a position sensing assembly, a controller, a buzzer, and a ladder knob. The ladder includes a fixed part, an inclined part, and multiple steps. The fixed part is disposed within a receiving groove and slidably connected to the bottom surface of the pit. The fixed part can slide out of the receiving groove. A horizontal rotation axis is shared between the top of the inclined part and the top of the fixed part, and the inclined part is rotatably configured along the rotation axis. This invention transforms the ladder into a more convenient stepped staircase form, allowing workers to easily and conveniently step onto the steps to enter the pit, thus replacing the safety hazards of traditional ladders. This significantly reduces the safety risks associated with personnel entering the pit via a pit ladder for work and inspection, and has broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and in particular to an intelligent elevator pit entry and exit device. Background Technology

[0002] Elevator operators and related personnel frequently need to enter the elevator pit for work and inspection. Ladders are a crucial device for these personnel to access the pit. Traditional pit ladders are vertically installed on the side wall of the pit shaft using expansion bolts, typically located below the landing door's foot guard or on either side of the landing door, with a certain distance between them and the landing sill. Due to the limited space in the elevator pit, this setup occupies a significant amount of side space in the shaft, making it difficult to guarantee the safety of the pit ladder. Furthermore, when entering the pit via the ladder, personnel must hold onto the landing door with one hand, reach for the handrail at the top of the ladder with the other, place one foot on the landing sill, and extend the other foot towards the ladder's rungs to test the stability. During the ascent and descent, extra caution must be taken to ensure a firm grip on the rungs. The risk of misstepping is particularly high when personnel are crossing the landing sill and ladder rungs. In deeper pits, accidents can easily result in injuries or fatalities. Therefore, the safety of the elevator pit entry and exit device is an important guarantee for elevator operators to carry out elevator operations and inspections. Summary of the Invention

[0003] Therefore, it is necessary to provide an intelligent elevator pit entry and exit device to address the technical problem of poor safety for elevator operators entering the pit through the elevator landing door in the existing technology.

[0004] An intelligent elevator pit entry and exit device is provided, wherein the shaft wall of the pit is provided with a receiving groove, and the entry and exit device includes a ladder, a drive component, a position sensing component and a controller;

[0005] The ladder includes:

[0006] A fixing part is disposed in the receiving groove and slidably connected to the bottom surface of the pit; the fixing part can slide out of the receiving groove.

[0007] An inclined portion, the top of which shares a horizontal rotation axis with the top of the fixed portion, is rotatably disposed along the rotation axis; and

[0008] Multiple pedals, each of which is hinged between the fixed part and the inclined part; when the inclined part rotates near the fixed part, each pedal tends to be vertical; when the inclined part rotates along the rotation axis to a preset angle, each pedal is horizontal, and the length of each pedal increases sequentially from top to bottom, with the multiple pedals distributed in a stepped manner;

[0009] The driving assembly includes a first driving unit and a second driving unit; the first driving unit is used to drive the fixed part to slide; the second driving unit is used to drive the inclined part to rotate along the rotation axis.

[0010] The position sensing component includes a first sensing unit, a second sensing unit, and a third sensing unit; the first sensing unit is used to generate a first trigger signal when the fixed part slides to a preset distance; the second sensing unit is used to generate a second trigger signal when the inclined part rotates to a preset angle; the third sensing unit is used to generate a third trigger signal when the bottom of the inclined part contacts the fixed part; and the fourth sensing unit is used to generate a fourth trigger signal when the fixed part is in the initial position.

[0011] The controller, upon receiving a ladder opening signal, sequentially executes the following actions: Action a: controlling the first drive unit to drive the fixed part to slide out of the receiving groove until the first trigger signal is received and then stopping the drive; Action b: controlling the second drive unit to drive the tilting part to rotate away from the fixed part until the second trigger signal is received and then stopping the drive; The controller is also configured to, upon receiving a ladder closing signal, sequentially execute the following actions: Action c: controlling the second drive unit to drive the tilting part to rotate towards the fixed part until the third trigger signal is received and then stopping the drive; Action d: controlling the first drive unit to drive the fixed part to reset until the fourth trigger signal is received and then stopping the drive.

[0012] As a preferred embodiment, the first drive unit includes an electric cylinder, one end of which is fixedly connected to the inner wall of the receiving groove, and the other end is fixedly connected to the fixing part.

[0013] As a preferred example, the second drive unit includes a motor, which is fixedly connected to the fixed part, and the output shaft of the motor is connected to the rotating shaft to drive the inclined part to rotate along the rotating shaft.

[0014] As a preferred example, the first sensing unit includes a first limit switch, which is installed on the sliding path of the fixed part. When the first limit switch is touched and changes from an open state to a closed state, the first trigger signal is generated.

[0015] The second sensing unit includes a second limit switch, which is mounted on a fixed part or an inclined part. When the second limit switch is touched and changes from an open state to a closed state, the second trigger signal is generated.

[0016] The third sensing unit includes a third limit switch, which is mounted on a fixed part or an inclined part. When the third limit switch is touched and changes from an open state to a closed state, the third trigger signal is generated.

[0017] The fourth sensing unit includes a fourth limit switch, which is installed on the path of the fixed part located in the initial position within the receiving groove. When the fourth limit switch is touched and changes from an open state to a closed state, the fourth trigger signal is generated.

[0018] As a preferred example, the entry / exit device further includes a foot guard plate located on one side of the receiving slot. The foot guard plate includes a movable part that is hinged to the sill of the elevator landing door, and the hinge axis is parallel to the rotation axis. The movable part rotates along the hinge axis. A pedal is also hinged to the movable part. When the movable part rotates to a preset angle, the pedal is in a horizontal state.

[0019] As a preferred embodiment, the drive assembly further includes a third drive unit for driving the movable part to rotate along its hinge axis.

[0020] As a preferred embodiment, the position sensing component further includes a fifth sensing unit, which is used to generate a fifth trigger signal when the movable part rotates to a preset angle; the controller is also used to perform action e: control the third driving unit to drive the movable part to rotate until the fifth trigger signal is obtained and then stop driving.

[0021] As a preferred example, after receiving the instruction of the ladder opening signal, the controller executes action e before action a according to the ladder opening signal; after receiving the instruction of the ladder closing signal, the controller executes action e after action d according to the ladder closing signal.

[0022] As a preferred example, the entry / exit device further includes a buzzer for emitting a prompting sound; the controller controls the buzzer to emit a prompting sound when it receives a second trigger signal and a third trigger signal.

[0023] As a preferred example, the access device further includes a ladder knob, which generates instructions to open the ladder and close the ladder respectively when rotated in different directions.

[0024] The beneficial effects of this invention are as follows: This invention provides a ladder that can transform its form, converting it into a more convenient step-like staircase. The transformation process is fully automated, safe, and reliable. When unfolded, the ladder forms an angle with the ground, allowing workers to easily and conveniently step onto the footboards to enter the pit. These footboards are easier to place on than the steps of traditional ladders, reducing the risk of slipping. This replaces the safety hazards of traditional ladders, significantly reducing the safety risks for personnel entering the pit for work and inspections, and has broad application prospects. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the initial state in Example 1;

[0026] Figure 2 This is a three-dimensional structural diagram of the ladder when it is unfolded in Example 1;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the ladder;

[0028] Figure 4 This is a schematic diagram showing the positions of the foot guards and ladder in the initial state of Embodiment 1;

[0029] Figure 5 This is a schematic diagram showing the position of the movable part when it is rotated 90° to a horizontal state in Embodiment 1;

[0030] Figure 6 This is a schematic diagram showing the position of the movable part when it is rotated 180° to a vertical state in Embodiment 1;

[0031] Figure 7 This is a schematic diagram showing the position of the ladder when it is fully extended in Example 1;

[0032] Figure 8 This is a flowchart of the controller control logic in Example 1.

[0033] In the diagram: 1. Shaft wall, 11. Receiving tank, 2. Ladder, 21. Fixing part, 22. Inclined part, 23. Rotating shaft, 24. Step, 3. Sill, 4. Electric cylinder, 5. Third limit switch, 6. Foot guard, 61. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] Example 1

[0039] Please see Figure 1 and Figure 2This embodiment provides an intelligent elevator pit entry and exit device, which includes a foot guard 6, a ladder 2, a drive assembly, a position sensing assembly, a controller (not shown in the figure), a buzzer (not shown in the figure), and a ladder knob (not shown in the figure). A receiving groove 11 is provided on the shaft wall 1 inside the foot guard 6 at the bottom of the elevator. The foot guard 6 is installed on the landing sill 3, and a portion of the foot guard 6 is a movable part 61. This movable part 61 is located outside the receiving groove 11 and corresponds to it, and is hinged to the sill 3. A pedal 24 is hinged to the movable part 61. A connecting rod is hinged to the pedal 24. The end of the connecting rod away from the pedal 24 is slidably connected to the movable part 61, and a limiting block is provided on the pedal 24 to limit the sliding position of the connecting rod. In the initial state, the movable part 61 is in a downward flipped state, located on the same plane as the other parts of the foot guard 6. When a worker enters the pit, the movable part 61 flips upward under the drive of the drive assembly. During the flipping process, because the pedal 24 is located on the back of the movable part 61, it rotates around its hinge axis under the influence of gravity. Until the movable part 61 rotates to a horizontal position, the pedal 24 is perpendicular to it, at which point the connecting rod abuts against the limiting block, preventing the angle between the pedal 24 and the movable part 61 from changing due to gravity. As the movable part 61 continues to flip, the angle between the pedal 24 and the movable part 61 remains at ninety degrees due to the blocking effect of the limiting block. Finally, when the movable part 61 flips to a vertical position, the pedal 24 is horizontal, serving as the first step for workers to enter the pit.

[0040] In its initial state (determined to be in the initial state upon receiving the fourth trigger signal), ladder 2 is stored in the receiving slot 11. In this embodiment, as... Figure 3As shown (only the third limit switch 5 is shown in the figure), the ladder 2 includes a fixed part 21, an inclined part 22, and multiple steps 24. Both the fixed part 21 and the inclined part 22 are designed as rectangular support structures, ensuring strength while reducing material usage and volume. The fixed part 21 is always vertically oriented. To ensure connection strength and stability, a sliding rail is provided at the bottom of the fixed part 21, which slides into and out of the receiving groove 11 via the sliding rail. The top of the inclined part 22 and the top of the fixed part 21 are connected by a horizontally arranged rotating shaft 23, meaning the inclined part 22 rotates around this rotating shaft 23 in the direction of rotation unobstructed by the receiving groove 11. Depending on the specific situation, several handrails can be added to the inclined part 22. Multiple steps 24 are hinged sequentially between the fixed part 21 and the inclined part 22 from top to bottom. Specifically, one end of each step 24 is rotatably connected to the fixed part 21, and the other end is rotatably connected to the inclined part 22 while also being able to slide. A guide rod mechanism is formed between the fixed part 21, the pedal 24, and the inclined part 22. In another embodiment, the pedal 24 can be configured as a telescopic plate structure, in which case the other end of the pedal 24 only needs to be rotatably connected to the inclined part 22, without the need for sliding. When the inclined part 22 rotates, the pedal 24 itself compensates by extending and retracting. Regardless of the implementation, when the inclined part 22 rotates toward the fixed part 21, each pedal 24 tends to be in a vertical state. When the inclined part 22 rotates away from the fixed part 21, each pedal 24 tends to be in a horizontal state. Until the inclined part 22 rotates to a preset angle (relative to the horizontal plane, which can be set between 65° and 75°), each pedal 24 is in a horizontal state. At this point, from top to bottom, since the length of each pedal 24 increases sequentially, plus the pedal 24 on the movable part 61, all the pedals 24 are distributed in a stepped manner. The operator can directly step on the pedal 24 to safely enter the pit.

[0041] The drive assembly includes a first drive unit, a second drive unit, and a third drive unit. In this embodiment, the first drive unit includes an electric cylinder 4, one end of which is fixedly connected to the inner wall of the receiving groove 11, and the other end is fixedly connected to the fixing part 21. The extension and retraction of the electric cylinder 4 drives the ladder 2 to move in and out of the receiving groove 11. The second drive unit includes a motor, the fixed end of which is fixed to the fixing part 21, and the output end is connected to a portion of the inclined part 22 on the rotating shaft 23, for driving the inclined part 22 to rotate along the rotating shaft 23. The third drive unit may also include a motor, which is fixed to the shaft 1 of the shaft, and the output end of which is connected to the hinge shaft of the movable part 61, for driving the movable part 61 to rotate.

[0042] The position sensing assembly includes a first sensing unit, a second sensing unit, a third sensing unit, a fourth sensing unit, and a fifth sensing unit. Specifically, all of the above sensing units can be limit switches. The first sensing unit is installed on the sliding path of the fixed part 21 located outside the receiving groove 11, and its specific fixed position is set according to a preset distance. When the first and fourth sensing units are touched by the fixed part 21 and change from an open state to a closed state, corresponding first and fourth trigger signals are generated. The second sensing unit is installed on the fixed part 21 or the inclined part 22. When the second sensing unit is pressed and touched by the fixed part 21 or the inclined part 22 and changes from an open state to a closed state, a second trigger signal is generated. The third sensing unit is also installed on the fixed part 21 or the inclined part 22, but unlike the second sensing unit, the triggering directions are opposite. When the third sensing unit is pressed and touched by the fixed part 21 or the inclined part 22 and changes from an open state to a closed state, a third trigger signal is generated. Similarly, the fifth sensing units are arranged on both sides of the rotating part 61. When the moving part 61 flips up and down to a preset angle, it touches the fifth sensing unit, and a fifth trigger signal is generated.

[0043] In another embodiment, the aforementioned sensing unit can also be an encoder. For example, the movable part 61 can be triggered by an encoder. The encoder is mounted on the motor shaft that drives the movable part 61 to rotate. The angular displacement of the motor rotation is set by software, and a fifth trigger signal is generated when the angular displacement matches that of the encoder. Alternatively, the encoder can directly replace the second and third sensing units to directly control the rotation angle of the tilting part 22, thereby achieving the purpose of controlling the opening and closing angle. The encoder determines the position of the drive component before and after performing the action and generates a corresponding trigger signal.

[0044] The ladder knob is located on the shaft wall 1 near the bottom floor door. Rotating it in different directions generates ladder open and ladder close signals respectively (the ladder knob can also be a button, functioning as a switch). Upon receiving the ladder open signal (the fifth sensing unit uses an encoder, and the other sensing units use limit switches), the controller executes the following actions in sequence: Action e: Controls the third drive unit to drive the movable part 61 to rotate upwards until it receives the fifth trigger signal and then stops driving; Action a: Controls the first drive unit to drive the fixed part 21 to slide out of the receiving groove 11 until it receives the first trigger signal and then stops driving; Action b: Controls the second drive unit to drive the tilting part 22 to rotate away from the fixed part 21 until it receives the second trigger signal and then stops driving, while simultaneously controlling the buzzer to emit a "Ladder ready" prompt, informing the operator that ladder 2 is ready. Upon receiving the ladder closing signal, the controller executes the following actions sequentially: Action c: Control the second drive unit to rotate the tilting part 22 towards the fixed part 21 until a third trigger signal is received, at which point the drive stops, and simultaneously the buzzer sounds a warning tone "Ladder retracted," informing the operator that ladder function 2 is canceled; Action d: Control the first drive unit to reset the fixed part 21 until a fourth trigger signal is received, at which point the drive stops; Action e: Control the third drive unit to rotate the moving part 61 downwards until a fifth trigger signal is received, at which point the drive stops. It should be noted that each action requires a trigger signal from the previous action to begin. Furthermore, when the elevator is in maintenance mode, the controller must receive a maintenance signal from the elevator before executing the above actions. Only after the controller receives the fourth and fifth trigger signals and confirms that the entry / exit device has fully retracted and reset can the elevator operate normally or in maintenance mode, thus ensuring elevator operation and operator safety.

[0045] The working principle of this invention is as follows: In the initial state (i.e., when the entry / exit device is not activated), such as Figure 4 The movable part 61 of the foot guard 6 flips down to below the sill 3, and is on the same plane as the other fixed parts of the foot guard 6. The ladder 2 is located in the receiving slot 11 and triggers the fourth sensing unit. Before the operator enters the elevator pit, to ensure safety, the operator opens the bottom floor door through the emergency unlocking device. First, rotate the ladder knob at the entrance of that floor door to put it in the open position. Figure 5 and Figure 6 As shown, when the ladder knob is in the open position, the movable part 61 of the foot guard 6 rotates upward around the lower edge of the landing sill 3 under the drive of the motor. During the rotation, the pedal 24 of the movable part 61 unfolds, and after the movable part 61 has finished rotating, the pedal 24 has also unfolded and is in a horizontal position. After the movable part 61 has finished rotating, the fixing part 21 slides out from the receiving groove 11 to a preset distance. Figure 7As shown, the inclined section 22 then begins to tilt away from the shaft wall 1. During the tilting process, multiple footplates 24 on the inclined section 22 unfold. After the inclined section 22 rotates to a preset angle, the footplates 24 also unfold and become horizontal. The buzzer then sounds to inform the workers that the ladder 2 is ready, and the relevant personnel can safely enter the pit to carry out the work via the ladder 2. After exiting the pit, the ladder knob at the entrance of that floor is rotated again to close it. The movement of the ladder 2 and the foot guard 6 is exactly the reverse of the above movements.

[0046] The controller for this access device can be a microcontroller. The aforementioned control logic is translated into software or a program. The software initializes once the elevator starts operating. The software continuously monitors the status of the ladder knobs. This access device utilizes the powerful data processing capabilities of a microcontroller. Through software programming, the microcontroller controls the motor and buzzer, and sets encoder parameters, thereby enabling the flipping of the landing door's foot guard, as well as the sliding, tilting, and retraction of the ladder. The software uses the Keiluvision2 programming environment, and the program is burned into the microcontroller via a serial port (RS232). The software processing flow is as follows: Figure 8 As shown.

[0047] Example 2

[0048] In this embodiment, compared with the above embodiment, the moving part 61, the third drive unit, and the fifth sensing unit are reduced, while other structures remain unchanged. When the controller receives the ladder-opening signal, it executes the following actions in sequence: Action a: Controlling the first drive unit to drive the fixed part 21 to slide out of the receiving slot 11 until a first trigger signal is received, then stopping the drive; Action b: Controlling the second drive unit to drive the tilting part 22 to rotate away from the fixed part 21 until a second trigger signal is received, then stopping the drive, while simultaneously controlling the buzzer to sound an alarm to inform the operator that the ladder 2 is ready. When the controller receives the ladder-closing signal, it executes the following actions in sequence: Action c: Controlling the second drive unit to drive the tilting part 22 to rotate closer to the fixed part 21 until a third trigger signal is received, then stopping the drive, while simultaneously controlling the buzzer to sound an alarm to inform the operator that the ladder 2 function is canceled; Action d: Controlling the first drive unit to drive the fixed part 21 to reset. Compared to Embodiment 1, in Embodiment 2, the uppermost step 24 on the ladder 2 is not far from the sill 3, allowing workers to directly step onto the step 24 on the ladder 2 to enter the pit. This reduces the impact of the step 24 on the movable part 61 on the safety of the access device. Furthermore, the design of some structures has been simplified, making the access device more compact and advantageous for use in confined spaces within the shaft.

[0049] In summary, this invention provides an intelligent elevator pit entry and exit device that integrates intelligence, safety, and convenience. It transforms the form of the ladder 2 into a more convenient stepped staircase, with a fully automated and reliable transformation process. When unfolded, the ladder 2 forms an angle of 65° to 75° with the ground, allowing workers to easily and conveniently step onto the footplate 24 to enter the pit. The footplate 24 is easier to place on and less prone to slipping compared to the steps of traditional ladders, thus replacing the safety hazards of traditional ladders. This significantly reduces the safety risks for personnel entering the pit via the ladder for work and inspection, and has broad application prospects.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A smart elevator pit access device, characterized in that, The shaft wall (1) of the pit is provided with a receiving groove (11), and the access device comprises a ladder (2), a driving assembly, a position sensing assembly and a controller. The ladder (2) comprises: a fixed part (21) arranged in the receiving groove (11) and slidably connected to the bottom surface of the pit, the fixed part (21) being capable of sliding out of the receiving groove (11); an inclined part (22) having a horizontal rotating shaft (23) between the top of the fixed part (21) and the top of the inclined part (22), the inclined part (22) being rotationally arranged along the rotating shaft (23); and a plurality of steps (24), each of which is hingedly connected between the fixed part (21) and the inclined part (22), each of the steps (24) tending to be in a vertical state when the inclined part (22) is rotated close to the fixed part (21), and each of the steps (24) being in a horizontal state when the inclined part (22) is rotated to a preset angle along the rotating shaft (23), and the length of each step (24) gradually increasing from top to bottom, and the plurality of steps (24) being distributed in a stepped manner; the driving assembly comprises a first driving unit and a second driving unit, the first driving unit being used to drive the fixed part (21) to slide, and the second driving unit being used to drive the inclined part (22) to rotate along the rotating shaft (23); the position sensing assembly comprises a first sensing unit, a second sensing unit, a third sensing unit and a fourth sensing unit, the first sensing unit being used to generate a first trigger signal when the fixed part (21) slides to a preset distance, the second sensing unit being used to generate a second trigger signal when the inclined part (22) rotates to a preset angle, the third sensing unit being used to generate a third trigger signal when the bottom of the inclined part (22) contacts the fixed part (21), and the fourth sensing unit being used to generate a fourth trigger signal when the fixed part (21) is in an initial position; the controller is used to sequentially perform the following actions after receiving an instruction of a ladder opening signal: action a, controlling the first driving unit to drive the fixed part (21) to slide out of the receiving groove (11) until the driving is stopped after the first trigger signal is obtained; action b, controlling the second driving unit to drive the inclined part (22) to rotate away from the fixed part (21) until the driving is stopped after the second trigger signal is obtained; and the controller is also used to sequentially perform the following actions after receiving an instruction of a ladder closing signal: action c, controlling the second driving unit to drive the inclined part (22) to rotate close to the fixed part (21) until the driving is stopped after the third trigger signal is obtained; and action d, controlling the first driving unit to drive the fixed part (21) to reset until the driving is stopped after the fourth trigger signal is obtained. The access device further comprises a foot guard (6) located at one side of the accommodating groove (11), the foot guard (6) comprising a movable part (61) hinged to the threshold (3) of the elevator landing door, the hinging axis being parallel to the rotating shaft (23), the movable part (61) rotating along the hinging axis; a pedal (24) is also hinged to the movable part (61), the pedal (24) being in a horizontal state when the movable part (61) rotates to a preset angle.

2. The intelligent elevator pit access device of claim 1, wherein, The first driving unit comprises an electric cylinder (4), one end of the electric cylinder (4) being fixedly connected to the inner wall of the accommodating groove (11), the other end being fixedly connected to the fixed part (21).

3. The intelligent elevator pit access device of claim 1, wherein, The second driving unit comprises an electric motor, the electric motor being fixedly connected to the fixed part (21), the output shaft of the electric motor being connected to the rotating shaft (23) for driving the inclined part (22) to rotate along the rotating shaft (23).

4. The intelligent elevator pit access device of claim 1, wherein, The first sensing unit comprises a first travel switch, the first travel switch being installed on the sliding path of the fixed part (21), the first travel switch generating the first trigger signal when being touched and changing from an open state to a closed state; The second sensing unit comprises a second travel switch, the second travel switch being installed on the fixed part (21) or the inclined part (22), the second travel switch generating the second trigger signal when being touched and changing from an open state to a closed state; The third sensing unit comprises a third travel switch (5), the third travel switch (5) being installed on the fixed part (21) or the inclined part (22), the third travel switch (5) generating the third trigger signal when being touched and changing from an open state to a closed state; The fourth sensing unit comprises a fourth travel switch, the fourth travel switch being installed on the path of the fixed part (21) at the initial position in the accommodating groove, the fourth travel switch generating the fourth trigger signal when being touched and changing from an open state to a closed state.

5. The intelligent elevator pit access device of claim 1, wherein, The driving assembly further comprises a third driving unit for driving the movable part (61) to rotate along the hinging axis thereof.

6. The intelligent elevator pit access device of claim 5, wherein, The position sensing assembly further comprises a fifth sensing unit for generating a fifth trigger signal when the movable part (61) rotates to a preset angle; the controller is further configured to perform action e: controlling the third driving unit to drive the movable part (61) to rotate until the fifth trigger signal is acquired.

7. The intelligent elevator pit access device of claim 6, wherein, The controller executes the action e before the action a according to the ladder opening signal after receiving the instruction of the ladder opening signal; the controller executes the action e after the action d according to the ladder closing signal after receiving the instruction of the ladder closing signal.

8. The intelligent elevator pit access device of claim 1, wherein, The access device further comprises a buzzer for emitting a prompt sound; the controller controls the buzzer to emit the prompt sound when the second trigger signal and the third trigger signal are received.

9. The intelligent elevator pit access device of claim 1, wherein, The access device further comprises a ladder knob for generating the instruction of the ladder opening signal and the instruction of the ladder closing signal when being rotated in different directions, respectively.

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