Safety fence for elevator shaft top maintenance and method of use thereof

Abstract

The application discloses an elevator shaft top maintenance safety fence and a use method thereof, and relates to the technical field of car top maintenance operation safety protection, which comprises the following steps: cutting off the main power supply of the elevator and executing a locking and posting procedure, confirming the power-off state of the elevator through an outgoing call test, outputting initial position information of the car, opening the hall door and pressing the car top emergency stop button, switching to a maintenance mode and verifying the point function, and outputting the car top maintenance control right; the car is moved to a level position by using the maintenance control right, the folded elevator shaft top maintenance safety fence is unfolded to a vertical state, and the elevator shaft top maintenance safety fence to be locked is output; the elevator shaft top maintenance safety fence is pressed down, the internal cam is used to trigger the horizontal telescopic clamping arm to buckle the shaft guide rail support. The application can guarantee the physical protection strength of the car top operation, accurately control the operation range, and effectively improve the safety and efficiency of the elevator shaft top maintenance operation.

Description

Technical Field

[0001] This invention relates to the field of safety protection technology for elevator car top maintenance operations, and in particular to a safety guardrail for elevator shaft top maintenance and its usage method. Background Technology

[0002] In modern elevator engineering practice, safety during maintenance work at the top of the elevator shaft is a major concern, and fall protection railings must be installed when working on the car top. Current safety railings for elevator shaft top maintenance mostly employ folding or telescopic structures, secured to the car top by manual bolts or bottom friction pads. While this design achieves basic physical isolation, its resistance to overturning moment relies primarily on static friction, making it prone to displacement under lateral impacts. Furthermore, installation reliability is heavily influenced by manual experience, making it difficult to provide absolutely rigid protection.

[0003] To address the issues of insufficient rigid coupling between guardrails and elevator shafts and the lack of hierarchical safety access control in existing technologies, this invention provides a safety guardrail for maintenance at the top of elevator shafts and its usage method. Existing technologies suffer from limitations such as a single force-bearing mode for guardrails and the inability to dynamically adjust operating permissions. This invention utilizes an internal cam to drive a horizontal telescopic locking arm to engage with the shaft guide rail bracket, leveraging the rigid components of the shaft to provide counter-thrust support. Furthermore, a dividing plate and microswitches encode the guardrail's deployment state into different operating permissions. This invention belongs to the field of elevator safety equipment technology and solves the problems of insufficient anti-overturning capacity of guardrails and the inability to hierarchically control maintenance safety domains. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a safety guardrail for maintenance at the top of elevator shaft and its usage method to solve the problems of insufficient anti-overturning capacity of guardrails and the inability to classify and control maintenance safety areas in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a safety guardrail for maintenance on the top of an elevator shaft and a method of using it, which includes cutting off the main power supply of the elevator and executing a locking and tagging procedure, confirming the power-off status of the elevator through an external call test, outputting the initial position information of the car, opening the hall door and pressing the emergency stop button on the top of the car, switching to maintenance mode and verifying the jog function, and outputting the maintenance control right on the top of the car. Using the maintenance control, move the car to the level position, unfold the folded elevator shaft top maintenance safety railing to the vertical position, and output the elevator shaft top maintenance safety railing to be locked. By pressing down the safety railing at the top of the elevator shaft, the internal cam triggers the horizontal telescopic locking arm to engage the shaft guide rail bracket, and at the same time the indexing plate engages the first position, outputting the guide rail locked. By tightening the mechanical locking nut to compact the car top, the first micro switch is closed in series with the safety circuit, and the safety guardrail for maintenance at the top of the elevator shaft with basic operating authority is output. By pressing down the safety railing at the top of the elevator shaft again, the indexing plate jumps into the second position, the second micro switch is closed to unlock the counterweight operation permission, and the fully extended safety railing at the top of the elevator shaft is output. After performing maintenance work, the indexing plate is reset, the locking arm is released, and the safety guardrail at the top of the elevator shaft is folded down to restore the elevator to normal operation.

[0007] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, the end of the horizontal telescopic locking arm is provided with an elastic wedge-shaped claw. When subjected to downward pressure, the elastic wedge-shaped claw automatically embeds into the preset slot of the shaft counterweight guide rail bracket to form a passive counter-push support force away from the center of the car.

[0008] As a preferred embodiment of the safety railing for maintenance at the top of the elevator shaft and its usage method described in this invention, the safety railing for maintenance at the top of the elevator shaft is provided with a bidirectional cam mechanism inside the column. During the downward pressing of the column, the bidirectional cam mechanism simultaneously drives the bottom adaptive friction pad to open and contact the car top surface and drives the top horizontal telescopic locking arm to extend horizontally.

[0009] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, the indexing plate is configured with at least two positions, wherein the first position corresponds to the state in which the horizontal telescopic locking arm is engaged with the shaft guide rail bracket, and the second position corresponds to the state in which the bottom of the column is further compacted against the car top and the counterweight is allowed to run throughout the entire process.

[0010] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, the first micro switch and the second micro switch are connected in series in the elevator safety circuit. The closing of the first micro switch only allows the car top maintenance inching mode, and the closing of the second micro switch further unlocks the counterweight over-the-top and top floor leveling operation permissions.

[0011] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, a wedge-shaped tensioning block is provided at the bottom of the column. When the mechanical locking nut is tightened, the wedge-shaped tensioning block generates a normal pressure perpendicular to the car top surface and a tangential frictional force parallel to the car top surface.

[0012] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, the safety guardrail for maintenance at the top of the elevator shaft further includes a retractable horizontal bar on the back side. When the indexing plate is in the second position and the counterweight is close to the buffer, the retractable horizontal bar can be rotated downward around the column axis to avoid the upper limit position of the counterweight.

[0013] As a preferred embodiment of the safety guardrail for maintenance at the top of the elevator shaft and its usage method described in this invention, the engagement action of the horizontal telescopic locking arm and the shaft guide rail bracket is mechanically linked with the unfolding action of the safety guardrail for maintenance at the top of the elevator shaft, and it remains physically locked until the indexing plate is reset to the initial position.

[0014] In a second aspect, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements any step of the safety guardrail for maintenance at the top of the elevator shaft and its method of use as described in the first aspect of the present invention.

[0015] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the safety guardrail for maintenance at the top of the elevator shaft and its method of use as described in the first aspect of the present invention.

[0016] The beneficial effects of this invention are as follows: By pressing down the safety guardrail for maintenance at the top of the elevator shaft and using an internal cam to trigger the horizontal telescopic locking arm to engage the shaft guide rail bracket, direct mechanical coupling between the guardrail and the rigid components of the shaft is achieved, improving anti-overturning stability. Through the coordination of indexing dial gear switching and microswitches, the mechanical deployment state of the guardrail is encoded into different elevator operating permissions, realizing hierarchical control of the safety domain. Combined with energy isolation, maintenance mode switching, and closed-loop reset processes, while ensuring the physical protection strength of car top operations, the operating range is precisely controlled, effectively improving the safety and efficiency of elevator shaft top maintenance operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating the safety railings for maintenance at the top of elevator shafts and their usage. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Reference Figure 1 As one embodiment of the present invention, this embodiment provides a safety guardrail for maintenance at the top of an elevator shaft and a method for using it, including the following steps: The end of the horizontal telescopic locking arm is provided with an elastic wedge-shaped claw. When subjected to downward pressure, the elastic wedge-shaped claw automatically embeds into the preset slot of the shaft counterweight guide rail bracket to form a passive counter-push support force away from the center of the car.

[0023] Furthermore, the elastic wedge-shaped claws at the end of the horizontal telescopic locking arm automatically embed into the preset slots of the shaft counterweight guide rail bracket when subjected to downward pressure, forming a passive counter-push support force away from the center of the car. Thus, without relying on an additional drive source, the anti-overturning ability of the guardrail is significantly enhanced by utilizing the existing rigid components of the shaft, effectively making up for the mechanical defects of traditional guardrails that rely solely on bottom friction for fixation.

[0024] The safety railing for maintenance at the top of the elevator shaft is equipped with a bidirectional cam mechanism inside its column. During the downward pressing of the column, the bidirectional cam mechanism simultaneously drives the bottom adaptive friction pads to open and contact the car top surface and drives the top horizontal telescopic locking arm to extend horizontally.

[0025] Furthermore, through the bidirectional cam mechanism inside the safety guardrail column for maintenance at the top of the elevator shaft, the bottom adaptive friction pads open to contact the car top surface and the top horizontal telescopic locking arm extends horizontally during the column pressing down, realizing the synchronous completion of bottom friction locking and top rigid coupling, simplifying the operation process and eliminating the risk of human error that may be caused by step-by-step operation.

[0026] The indexing plate is set to at least two positions, wherein the first position corresponds to the state in which the horizontal telescopic locking arm is engaged with the shaft guide rail bracket, and the second position corresponds to the state in which the bottom of the column is further compacted and the car top is allowed to run throughout the entire process.

[0027] Furthermore, by setting an indexing plate with at least two positions, where the first position corresponds to the state where the horizontal telescopic locking arm is engaged with the shaft guide rail support, and the second position corresponds to the state where the bottom of the column is further compacted and the car top is allowed to run the counterweight throughout the entire process, the precise coding of the mechanical deployment degree of the guardrail is realized, providing a reliable physical basis for the subsequent graded control of the safety circuit.

[0028] The first micro switch and the second micro switch are connected in series in the elevator safety circuit. The closing of the first micro switch only allows the car top inspection inching mode, while the closing of the second micro switch further unlocks the counterweight over-the-top and top floor leveling operation permissions.

[0029] Furthermore, by connecting the first microswitch and the second microswitch in series in the elevator safety circuit, the closing of the first microswitch only allows the car top maintenance inching mode, while the closing of the second microswitch further unlocks the counterweight over-the-top and top floor leveling operation permissions, thereby realizing the safety classification of the maintenance operation scope at the hardware level and preventing risks caused by excessive opening of operation permissions.

[0030] The bottom of the column is provided with a wedge-shaped tensioning block, which generates a normal pressure perpendicular to the car top surface and a tangential frictional force parallel to the car top surface when the mechanical locking nut is tightened.

[0031] Furthermore, the wedge-shaped tensioning block at the bottom of the column generates a normal pressure perpendicular to the car top surface and a tangential frictional force parallel to the car top surface when the mechanical locking nut is tightened, forming a compound locking effect. This further improves the anti-slip performance of the guardrail when subjected to lateral impact, ensuring the overall stability of the guardrail.

[0032] The safety guardrail for maintenance at the top of the elevator shaft also includes a retractable horizontal bar on the back side. When the indexing plate is in the second position and the counterweight is close to the buffer, the retractable horizontal bar can be rotated downward around the column axis to avoid the upper limit position of the counterweight.

[0033] Furthermore, by using the retractable crossbar on the back side of the safety railing for maintenance at the top of the elevator shaft, when the indexing plate is in the second position and the counterweight is close to the buffer, it can rotate downward around the column axis to avoid the upper limit position of the counterweight, thereby solving the mechanical interference problem under the critical working condition of the top floor height while ensuring that the upper protection height remains unchanged.

[0034] The engagement action of the horizontal telescopic locking arm with the shaft guide rail bracket is mechanically linked to the unfolding action of the safety guardrail for maintenance at the top of the elevator shaft, and it remains physically locked until the indexing plate is reset to the initial position.

[0035] Furthermore, the mechanical linkage between the horizontal telescopic locking arm and the shaft guide rail bracket and the unfolding action of the safety guardrail for maintenance at the top of the elevator shaft is achieved. The guardrail remains physically locked until the indexing plate is reset to its initial position, ensuring that the rigid connection between the guardrail and the shaft will not be accidentally released due to vibration or misoperation throughout the entire operation, thus greatly improving the reliability of use.

[0036] This embodiment also provides a computer device applicable to the use of a safety railing for maintenance at the top of an elevator shaft and its method of use, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the safety railing for maintenance at the top of an elevator shaft and its method of use as proposed in the above embodiment.

[0037] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0038] This embodiment also provides a storage medium storing a computer program. When executed by a processor, the program implements the safety guardrail for elevator shaft top maintenance and its usage method as described in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0039] In summary, this invention achieves direct mechanical coupling between the safety guardrail for maintenance at the top of the elevator shaft and the shaft guide rail bracket by pressing down the guardrail and using an internal cam to trigger the horizontal telescopic locking arm. This improves anti-overturning stability. Through indexing dial gear switching and microswitches, the mechanical deployment state of the guardrail is encoded into different elevator operating permissions, achieving hierarchical control of the safety domain. Combined with energy isolation, maintenance mode switching, and closed-loop reset processes, the invention precisely controls the operating range while ensuring the physical protection strength of car top operations, effectively improving the safety and efficiency of elevator shaft top maintenance work.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A safety guardrail for maintenance at the top of an elevator shaft and its method of use, characterized in that: include, Cut off the main power supply to the elevator and execute the lockout and tagging procedure. Confirm the power outage status of the elevator through an external call test. Output the initial position information of the car. Open the hall door and press the emergency stop button on the top of the car. Switch to the maintenance mode and verify the jog function. Output the maintenance control authority on the top of the car. Using the maintenance control, move the car to the level position, unfold the folded elevator shaft top maintenance safety railing to the vertical position, and output the elevator shaft top maintenance safety railing to be locked. By pressing down the safety railing at the top of the elevator shaft, the internal cam triggers the horizontal telescopic locking arm to engage the shaft guide rail bracket, and at the same time the indexing plate engages the first position, outputting the guide rail locked. By tightening the mechanical locking nut to compact the car top, the first micro switch is closed in series with the safety circuit, and the safety guardrail for maintenance at the top of the elevator shaft with basic operating authority is output. By pressing down the safety railing at the top of the elevator shaft again, the indexing plate jumps into the second position, the second micro switch is closed to unlock the counterweight operation permission, and the fully extended safety railing at the top of the elevator shaft is output. After performing maintenance work, the indexing plate is reset, the locking arm is released, and the safety guardrail at the top of the elevator shaft is folded down to restore the elevator to normal operation.

2. The safety railing for maintenance at the top of the elevator shaft as described in claim 1 and its method of use, characterized in that: The end of the horizontal telescopic locking arm is provided with an elastic wedge-shaped claw. When subjected to downward pressure, the elastic wedge-shaped claw automatically embeds into the preset slot of the shaft counterweight guide rail bracket to form a passive counter-push support force away from the center of the car.

3. The safety railing for maintenance at the top of the elevator shaft and its method of use as described in claim 2, characterized in that: The safety railing for maintenance at the top of the elevator shaft is equipped with a bidirectional cam mechanism inside its column. During the downward pressing of the column, the bidirectional cam mechanism simultaneously drives the bottom adaptive friction pads to open and contact the car top surface and drives the top horizontal telescopic locking arm to extend horizontally.

4. The safety railing for maintenance at the top of the elevator shaft and its method of use as described in claim 3, characterized in that: The indexing plate is set to at least two positions, wherein the first position corresponds to the state in which the horizontal telescopic locking arm is engaged with the shaft guide rail bracket, and the second position corresponds to the state in which the bottom of the column is further compacted and the car top is allowed to run throughout the entire process.

5. The safety railing for maintenance at the top of the elevator shaft as described in claim 4 and its method of use, characterized in that: The first micro switch and the second micro switch are connected in series in the elevator safety circuit. The closing of the first micro switch only allows the car top inspection inching mode, while the closing of the second micro switch further unlocks the counterweight over-the-top and top floor leveling operation permissions.

6. The safety railing for maintenance at the top of the elevator shaft as described in claim 5 and its method of use, characterized in that: The bottom of the column is provided with a wedge-shaped tensioning block, which generates a normal pressure perpendicular to the car top surface and a tangential frictional force parallel to the car top surface when the mechanical locking nut is tightened.

7. The safety railing for maintenance at the top of the elevator shaft as described in claim 6 and its method of use, characterized in that: The safety guardrail for maintenance at the top of the elevator shaft also includes a retractable horizontal bar on the back side. When the indexing plate is in the second position and the counterweight is close to the buffer, the retractable horizontal bar can be rotated downward around the column axis to avoid the upper limit position of the counterweight.

8. The safety railing for maintenance at the top of the elevator shaft as described in claim 7 and its method of use, characterized in that: The engagement action of the horizontal telescopic locking arm with the shaft guide rail bracket is mechanically linked to the unfolding action of the safety guardrail for maintenance at the top of the elevator shaft, and it remains physically locked until the indexing plate is reset to the initial position.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the safety guardrail for maintenance at the top of the elevator shaft and the method of using it as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the safety guardrail for maintenance at the top of the elevator shaft and the method of using it as described in any one of claims 1 to 8.

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