Elevator car accidental movement protection method and protection system

Abstract

The present invention relates to a method and system for protecting an elevator car from accidental movement, the method comprising: an accidental movement monitoring device monitors the car running speed and the elevator running instructions of the elevator running control system to determine whether the elevator car has accidental movement; if the accidental movement monitoring device determines that the elevator car has accidental movement, a reverse braking indication signal is sent to a control device; the control device sends an enable signal to a drive device after receiving the reverse braking indication signal; and the drive device outputs a reverse braking torque to brake the elevator car after receiving the enable signal.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, in particular to the technical field of elevator safety protection, and more specifically to a method for protecting an elevator car from accidental movement and a system for protecting an elevator car from accidental movement. Background Art

[0002] With the development of my country's social economy, high-rise buildings continue to emerge, and elevators have gradually become popular. While elevators bring convenience to users, their potential safety hazards are gradually being paid attention to. Among various elevator safety issues, the harm of unexpected movement of the car due to system failure is particularly serious.

[0003] At present, the protection against accidental movement of elevator cars in the elevator field is mainly focused on the low-speed car slipping, and the action position is limited to the door area. Generally, the slipping speed of the elevator is limited by adding a star-sealing contactor to short-circuit the motor input terminal when the low-speed car moves unexpectedly. However, the star-sealing contactor can only work when the elevator is running at a low speed. For general host machines, the star-sealing is often limited when the host is running at a high speed, and may even damage the host machine. This leads to serious consequences if the brake system fails when the elevator moves unexpectedly at a high speed.

[0004] Therefore, there is an urgent need in the art for an elevator safety protection system that can realize reliable protection against accidental movement of the elevator car at various operating speeds.

[0005] It should be noted that the information disclosed in the background technology section of the invention is only intended to deepen the understanding of the general background technology of the invention, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to address the above-mentioned technical defects existing in the existing elevator system and to provide an improved method and system for protecting the elevator car from accidental movement, which can greatly improve the safety and reliability of the elevator system. The method and system can timely and reliably monitor the accidental movement of the elevator car, and can output a reverse torque to stop the car through the drive system when the accidental movement of the elevator car is detected, thereby providing reliable protection against accidental movement of the car.

[0007] In addition, the present invention can also perform differentiated star-sealing operations at different elevator running speeds to short-circuit the host input terminal at an appropriate time to limit the sliding speed of the elevator and avoid the star-sealing current damaging the host and / or the controllable switch tube when the elevator stops at high speed.

[0008] In addition, the present invention also realizes uninterrupted protection by adding an emergency power supply, thereby further improving the safety and reliability of the elevator system.

[0009] According to one aspect of the present invention, there is provided a method for protecting an elevator car from unexpected movement, comprising:

[0010] The unexpected movement monitoring device monitors the elevator car running speed and the elevator running command of the elevator running control system to determine whether the elevator car has unexpected movement;

[0011] If the unexpected movement monitoring device determines that the elevator car has unexpectedly moved, a reverse braking indication signal is sent to the control device;

[0012] The control device sends an enable signal to the drive device after receiving the reverse braking instruction signal; and

[0013] After receiving the enable signal, the drive device outputs a reverse braking torque to brake the elevator car.

[0014] Preferably, when it is monitored that the elevator operation control system has no command information output and the speed signal of the elevator car can still be monitored after a predetermined braking time, the unexpected movement monitoring device (3) sends a reverse braking instruction signal to the control device.

[0015] Preferably, the control device closes the hall car door and calls for rescue after sending the enable signal, and then controls the car to run to the top floor or the bottom floor in the light load direction; or the control device closes the hall car door and calls for rescue after sending the enable signal, and then cuts off the output to the host to immediately shut down the star.

[0016] Preferably, the control device also delays outputting the star-sealing signal when an emergency stop of the elevator occurs when it is detected that the running speed of the elevator is greater than a predetermined threshold speed, and outputs the star-sealing signal to the star-sealing module only after the brake stops the host.

[0017] Preferably, the control device also directly outputs a star-sealing signal to the star-sealing module without delay when the elevator stops when it is detected that the running speed of the elevator is less than or equal to a predetermined threshold speed.

[0018] According to another aspect of the present invention, there is provided an elevator car accidental movement protection system, the system comprising a driving device, a control device and an accidental movement monitoring device, wherein:

[0019] The unexpected movement monitoring device includes a speed monitoring device and an elevator operation command monitoring device, wherein the speed monitoring device is used to monitor the car operation speed, and the elevator operation command monitoring device is used to monitor the command information of the elevator operation control system;

[0020] The unexpected movement monitoring device is used to send a reverse braking indication signal to the control device when unexpected movement of the elevator car is detected;

[0021] The control device is used to send an enable signal to the drive device after receiving the reverse braking instruction signal; and

[0022] The driving device is used to output a reverse braking torque to brake the elevator car after receiving the enabling signal.

[0023] Preferably, the unexpected movement monitoring device is used to send a reverse braking instruction signal to the control device when the elevator operation command monitoring device monitors that the elevator operation control system has no command information output and the speed monitoring device can still monitor the speed signal of the elevator car after a predetermined braking time.

[0024] Preferably, the control device is also used to close the hall car door and call for rescue after sending the enable signal, and then control the car to run in the light load direction to the top floor or the bottom floor.

[0025] Preferably, the system also includes a star-sealing module, and the control device is also used to delay the output of a star-sealing signal when an emergency stop of the elevator occurs when it is detected that the running speed of the elevator is greater than a predetermined threshold speed, and the star-sealing signal is not output to the star-sealing module until the brake stops the host.

[0026] Preferably, the control device is also used to directly output a star-sealing signal to the star-sealing module without delay when the elevator stops when it is detected that the running speed of the elevator is less than or equal to a predetermined threshold speed.

[0027] Preferably, the system further comprises a contactor coupled to the control device, the contactor being used for short-circuiting contactor contacts when the elevator car moves unexpectedly so that the reverse braking torque output by the drive device is transmitted to the main machine.

[0028] Preferably, the driving device comprises a switch tube module, and the switch tube module is controlled by the control device to shut down the output of the driving device.

[0029] Preferably, the control device is also used to close the hall car door and call for help after sending the enable signal, and then cut off the output to the host to immediately shut down the star.

[0030] Preferably, the system further comprises an emergency power supply for providing electrical energy to the system when power is cut off from the system.

[0031] According to yet another aspect of the present invention, an elevator is provided, comprising the elevator car accidental movement protection system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following will describe the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings. For clarity, the same components in different drawings are indicated by the same reference numerals. In addition, it is understood by those skilled in the art that the specific embodiments shown in the drawings are only exemplary and are not intended to limit the scope of the present invention, and the drawings of the present invention are not necessarily drawn to scale.

[0033] Figure 1 A schematic diagram showing an elevator car accidental movement protection system according to a first preferred embodiment of the present invention;

[0034] Figure 2 A schematic diagram showing an elevator car accidental movement protection system according to a second preferred embodiment of the present invention;

[0035] Figure 3 A schematic diagram showing an elevator car accidental movement protection system according to a third preferred embodiment of the present invention; and

[0036] Figure 4 A schematic structural diagram of an unexpected movement monitoring device according to another preferred embodiment of the present invention is shown. DETAILED DESCRIPTION

[0037] The following is a detailed description of an exemplary embodiment of the present invention in conjunction with the accompanying drawings. For the sake of clarity and brevity, the actual embodiments are not limited to the technical features described in the specification. It should be noted that in the process of improving and modifying any actual embodiment, in order to achieve a specific goal, the process of improvement and modification may be very complicated and time-consuming, but this is still a conventional technical means for those skilled in the art who know the benefits of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the protection scope of the present invention includes but is not limited to the following embodiments.

[0038] Certain terms are used throughout this application to refer to specific system components. As will be appreciated by those skilled in the art, different names may often be used to refer to the same component, and thus this application is not intended to distinguish between components that differ only in name and not in function. In this application, the terms "include," "comprises," and "have" are used in an open format and should therefore be interpreted to mean "including, but not limited to ..."

[0039] The technical problem solved by the present invention can be achieved by adopting the following preferred implementation modes.

[0040] Figure 1 FIG. 2 shows a schematic diagram of an elevator car accidental movement protection system according to a first preferred embodiment of the present invention. Figure 1As shown, the elevator car accidental movement protection system according to a preferred embodiment of the present invention comprises a driving device 1, a control device 4 and an accidental movement monitoring device 3. The driving device 1 is coupled to the host 6, and the control device 4 is coupled to the driving device 1 and the accidental movement monitoring device 3 respectively.

[0041] The unexpected movement monitoring device 3 preferably receives the elevator car running speed signal from the elevator car speed sensor (not shown in the figure), and also preferably receives the running instruction information of the elevator running control system from the elevator running control system (not shown in the figure) to determine whether the elevator car has unexpected movement.

[0042] According to a preferred embodiment of the present invention, Figure 4 As shown, the unexpected movement monitoring device 3 includes a speed monitoring device 31 and an elevator operation command monitoring device 32. The speed monitoring device 31 is used to monitor the car operation speed, and the elevator operation command monitoring device 32 is used to monitor the operation command information of the elevator operation control system.

[0043] If the unexpected movement monitoring device 3 determines that the elevator car has unexpectedly moved, a reverse braking instruction signal is sent to the control device 4. After receiving the reverse braking instruction signal, the control device 4 sends an enable signal to the drive device 1. After receiving the enable signal, the drive device 1 outputs a reverse braking torque to brake the elevator car.

[0044] Preferably, the magnitude of the reverse braking torque can be determined according to the current of the traction machine or the car load provided by the weighing device. Of course, the determination method is not limited to these two methods, and those skilled in the art can select other feasible determination methods according to actual design requirements.

[0045] In addition, when a frequency converter is used to drive the host 6 , the drive device 1 may also have a safe torque off (STO) function, that is, the drive device 1 directly controls the switch tube module 9 to shut down the output of the drive device 1 .

[0046] Preferably, when the elevator operation command monitoring device 32 monitors that the elevator operation control system has no command information output and the speed monitoring device 31 can still monitor the speed signal of the elevator car after the predetermined braking time, the unexpected movement monitoring device 3 determines that the elevator car has unexpectedly moved, and at this time the unexpected movement monitoring device 3 will send a reverse braking indication signal to the control device 4. Then the control device 4 will send an enable signal to the drive device 1 to enable the drive device 1 to output a reverse braking torque to brake the elevator car.

[0047] In addition, after sending the enable signal, the control device 4 preferably closes the hall door and calls for help, and then controls the car to run in the light load direction to the top floor or the bottom floor.

[0048] Figure 2 FIG. 2 shows a schematic diagram of an elevator car accidental movement protection system according to a second preferred embodiment of the present invention. Figure 2 As shown, the driving device 1 and the accidental movement monitoring device 3 of this embodiment are the same as those of the first embodiment, and thus will not be described in detail herein.

[0049] Different from the first embodiment, the elevator car accidental movement protection system of the second embodiment further includes a star-sealing module 5 , which is coupled to the driving device 1 and the host 6 respectively.

[0050] When the elevator car stops suddenly while running at high speed (i.e., the running speed of the elevator car is greater than the predetermined threshold speed), the control device 4 will delay outputting the star-blocking signal until the brake stops the host 6, and then the control device 4 will output the star-blocking signal to the star-blocking module to block the star. Because when the safety circuit is suddenly disconnected during the high-speed operation of the elevator, causing the elevator to stop at high speed, if the star-blocking is immediately performed to short-circuit the input end of the host 6, a large current will be generated, which will easily damage the host 6 and / or the controllable switch tube 9 of the drive device 1, thereby not only increasing the maintenance cost but also causing greater safety problems.

[0051] When the elevator car stops while running at a low speed (i.e., the running speed of the elevator car is less than or equal to the predetermined threshold speed), the control device 4 directly outputs the star-sealing signal to the star-sealing module 5 without delay, because the possibility of damaging the host or the controllable switch tube is relatively small at this time.

[0052] It can be seen that according to the second preferred embodiment of the present invention, not only can the reverse torque be output by the drive system to stop the elevator car when an unexpected movement of the elevator car is detected, but also different star-locking operations can be performed according to different running speeds of the elevator to short-circuit the host input terminal at an appropriate time, thereby limiting the sliding speed of the elevator and avoiding the star-locking current from damaging the host and / or the controllable switch tube when the elevator stops at a high speed. It can be said that the second preferred embodiment provides double safety protection for the elevator system, so as to further enhance the reliability and safety of the elevator system.

[0053] In addition, if Figure 2 As shown, the elevator car accidental movement protection system according to the second preferred embodiment may also include an emergency power supply 2, which is used to provide power to the system when the system is powered off, so that uninterrupted protection can still be provided when the elevator is powered off, thereby further improving the safety and reliability of the elevator system.

[0054] Figure 3 FIG. 2 shows a schematic diagram of an elevator car accidental movement protection system according to a third preferred embodiment of the present invention. Figure 3As shown, the driving device 1, the emergency power supply 2, the accidental movement monitoring device 3 and the star-sealing module 5 of this embodiment are the same as those of the second embodiment, and thus will not be described in detail herein.

[0055] Different from the second embodiment, the elevator car accidental movement protection system of the third embodiment also includes a contactor 7, which is coupled to the control device 4. The contactor 7 is used to be controlled by the control device 4 to short-circuit the contactor contacts 8 when the elevator car moves unexpectedly, so that the reverse braking torque output by the drive device 1 is transmitted to the main machine 6 to stop the main machine 6.

[0056] In addition, preferably, when the elevator car moves unexpectedly, the control device 4 closes the hall car door and calls for rescue after sending the enable signal to the drive device 1, and then cuts off the output to the host 6 to shut down the star.

[0057] According to another preferred embodiment of the present invention, an elevator is provided, the elevator comprising the elevator car accidental movement protection system as described above. Since its core components and structure have been described in detail above, they will not be repeated here.

[0058] The elevator car accidental movement protection system provided by the present invention has a practical and simple structure, obvious cost advantages, and can effectively and reliably provide safety protection for accidental movement of the car. In addition, the present invention can not only limit the sliding speed of the elevator but also avoid the damage of the main unit and / or the controllable switch tube by the star-locking current when the elevator stops at high speed, and can also achieve uninterrupted protection by adding an emergency power supply, thereby further improving the safety and reliability of the elevator system.

[0059] The foregoing disclosure of the embodiments of the present disclosure has been proposed for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present disclosure to the precise form disclosed. In light of the above disclosure, many changes and modifications of the embodiments described herein will be apparent to those of ordinary skill in the art. Please note that the above examples are not intended to be restrictive. Additional embodiments of the devices, systems, and equipment that may include many of the above features may also be contemplated. After studying the accompanying drawings and detailed description, other devices, equipment, features, and advantages of the present disclosure will become more apparent to those of ordinary skill in the art. It is intended that all such other devices, equipment, features, and advantages be included within the scope of protection of the present invention.

[0060] Unless otherwise specifically stated or understood otherwise within the context of use, conditional language such as "can," "may," "might," or "could" is generally intended to convey that certain embodiments may include, but are not required to include, certain features and / or elements. Thus, such conditional language is generally not intended to imply that one or more embodiments must in any way include the features and / or elements.

Claims

1. An elevator car accidental movement protection system, characterized in that: The system comprises a driving device (1), a control device (4), a star-sealing module (5) and an unexpected movement monitoring device (3), wherein: The unexpected movement monitoring device (3) comprises a speed monitoring device (31) and an elevator operation command monitoring device (32), wherein the speed monitoring device (31) is used to monitor the elevator car operation speed, and the elevator operation command monitoring device (32) is used to monitor the command information of the elevator operation control system; The unexpected movement monitoring device (3) is used to send a reverse braking indication signal to the control device (4) when unexpected movement of the elevator car is detected; The control device (4) is used for sending an enable signal to the drive device (1) after receiving the reverse braking instruction signal; and The driving device (1) is used to output a reverse braking torque to brake the elevator car after receiving the enabling signal. The invention is characterized in that the unexpected movement monitoring device (3) is used to send a reverse braking instruction signal to the control device (4) when the elevator operation command monitoring device (32) monitors that the elevator operation control system has no command information output and the speed monitoring device (31) can still monitor the speed signal of the elevator car after a predetermined braking time. The control device (4) is also used for delaying the output of the star-blocking signal when the elevator stops suddenly when it is detected that the running speed of the elevator is greater than a predetermined threshold speed, and outputting the star-blocking signal to the star-blocking module (5) only after the brake stops the host. The control device (4) is also used for directly outputting a star-blocking signal to the star-blocking module (5) without delay when the elevator stops when it is detected that the running speed of the elevator is less than or equal to a predetermined threshold speed.

2. The elevator car accidental movement protection system according to claim 1, characterized in that: The control device (4) is also used to close the hall car door and call for help after sending the enable signal, and then control the car to run in the light load direction to the top floor or the bottom floor.

3. The elevator car accidental movement protection system according to claim 1, characterized in that: The system further comprises a contactor (7) coupled to the control device (4), wherein the contactor (7) is used to short-circuit contactor contacts (8) when the elevator car moves unexpectedly so that the reverse braking torque output by the drive device (1) is transmitted to the main machine (6).

4. The elevator car accidental movement protection system according to claim 1, characterized in that: The driving device (1) comprises a switch tube module (9), and the switch tube module (9) is controlled by the control device (4) to shut down the output of the driving device (1).

5. The elevator car accidental movement protection system according to claim 1, characterized in that: The control device (4) is also used to close the hall car door and call for help after sending the enable signal, and then cut off the output to the host (6) to immediately shut down the star.

6. The elevator car accidental movement protection system according to any one of claims 1 and 3, characterized in that: The system also includes an emergency power supply (2) for providing electrical energy to the system when the system is powered off.

7. A method for protecting an elevator car from accidental movement, using the elevator car accidental movement protection system according to claims 1 to 6, characterized in that: The unexpected movement monitoring device (3) monitors the elevator car running speed and the elevator running command of the elevator running control system to determine whether the elevator car has unexpected movement; If the unexpected movement monitoring device (3) determines that the elevator car has unexpectedly moved, a reverse braking indication signal is sent to the control device (4); The control device (4) sends an enable signal to the drive device (1) after receiving the reverse braking instruction signal; and After receiving the enabling signal, the driving device (1) outputs a reverse braking torque to brake the elevator car. The invention is characterized in that when it is monitored that the elevator operation control system has no command information output and the speed signal of the elevator car can still be monitored after a predetermined braking time, the unexpected movement monitoring device (3) sends a reverse braking instruction signal to the control device (4). The control device (4) also delays outputting a star-blocking signal when an elevator emergency stops when it is detected that the elevator running speed is greater than a predetermined threshold speed, and does not output the star-blocking signal to the star-blocking module (5) until the brake stops the host. The control device (4) also directly outputs a star-blocking signal to the star-blocking module (5) without delay when the elevator stops when it is detected that the running speed of the elevator is less than or equal to a predetermined threshold speed.

8. The elevator car accidental movement protection method according to claim 7, characterized in that: After sending the enable signal, the control device (4) closes the hall car door and calls for help, and then controls the car to run in the light load direction to the top floor or the bottom floor; or after sending the enable signal, the control device (4) closes the hall car door and calls for help, and then cuts off the output to the host (6) to immediately shut down the star.

9. An elevator, characterized in that: The elevator comprises an elevator car accidental movement protection system as claimed in claims 1-6.

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