Elevator operation health status monitoring method and elevator safety system

Abstract

The present invention provides an elevator operation health status monitoring method and an elevator safety system, which belongs to the technical field of elevators. The present invention calculates the elevator speed according to the RFID tags pre-placed in the shaft; if the elevator speed exceeds the preset speed, the car position at the next moment is calculated, and if the car position at the next moment does not exceed the limit safety distance from the top and bottom of the shaft, an early warning is issued and the brake is activated; if the car position at the next moment exceeds the limit safety distance, the safety clamp is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued; after the brake is activated, if the elevator does not slow down, the brake power is cut off, and according to the different positions of the car at the next moment, the safety clamp is activated by the self-generating device to slowly stop or the safety clamp is activated by the self-generating device to stop immediately. If the elevator slows down, the elevator is stopped in different ways according to the car position at the next moment. The present invention can stop the elevator in a power-off state to avoid the danger of rushing to the top and squatting at the bottom.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevators, and in particular relates to an elevator operation health status monitoring method and an elevator safety system. Background Art

[0002] The existing health monitoring and safety systems of elevators mainly revolve around elevator brakes, safety clamps, speed limiters and door machines, especially the related monitoring technologies for serious safety accidents such as elevators hitting the top and bottom. On the one hand, they must rely on power supply control technology with a power supply. Once a power outage occurs, the elevator will inevitably lose power and be unable to operate, trapping people. If the brakes fail at this moment, it will inevitably lead to serious accidents such as hitting the top or bottom. On the other hand, the use of more advanced laser ranging technology to monitor elevators can prevent the above accidents to a certain extent, but the natural weakness of this technology is that the laser must also rely on power supply, and the light beam is easily disturbed by dust, foreign objects, oil reflection or scattering, resulting in monitoring failure. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a method for monitoring the health status of an elevator, comprising the following steps:

[0004] Calculate the elevator speed based on the RFID tags pre-placed in the hoistway;

[0005] If the elevator speed exceeds the preset speed, the car position at the next moment is calculated. If the car position at the next moment does not exceed the limit safety distance from the top and bottom of the shaft, an early warning is issued and the brake is activated; if the car position at the next moment exceeds the limit safety distance, the safety clamp is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued;

[0006] After the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car at the next moment, the self-generating device activates the safety clamp to stop slowly or the self-generating device activates the safety clamp to stop immediately; if the elevator slows down after the brake is activated, different methods are used to stop the elevator according to the position of the car at the next moment;

[0007] The self-generating device can move up and down with the car, and generate and store electricity during movement.

[0008] Preferably, after the brake is activated, if the elevator does not decelerate, the brake power supply is cut off, and according to the different positions of the car at the next moment, the self-generating device activates the safety clamp to slowly stop the elevator or the self-generating device activates the safety clamp to immediately stop the elevator, which specifically includes the following steps:

[0009] After the brake is activated, if the elevator does not slow down, cut off the brake power supply to determine whether the elevator is slowing down:

[0010] If the elevator still does not slow down, determine whether the car position exceeds the limit safety distance from the top and bottom of the shaft at the next moment. If not, the self-generating device will start the safety clamp to slowly stop the elevator. If it exceeds, the self-generating device will start the safety clamp to stop the elevator immediately.

[0011] If the elevator has slowed down, the self-generating equipment will start the safety clamp to stop the elevator while ensuring safety.

[0012] Preferably, after the brake is activated, if the elevator slows down, it is determined whether the next moment the car position is more than the limit safety distance from the top and bottom of the shaft; if not, the self-generating device is used to activate the safety clamp to slowly stop the elevator; during operation, it is determined whether the elevator is currently at a level floor; if so, the elevator is stopped and the door is opened to let people in; if not, it is repeatedly determined whether the next moment the car position is more than the limit safety distance from the top and bottom of the shaft; until the elevator is stopped to let people in when it is at a level floor or the self-generating device is used to activate the safety clamp to stop the elevator immediately when it exceeds the limit safety distance.

[0013] Preferably, calculating the elevator speed comprises the following steps:

[0014] The car passing time is obtained based on the RFID tags pre-placed in the shaft;

[0015] Calculate the car displacement through the position of the RFID tag;

[0016] The elevator speed is calculated based on the car displacement and the time between two consecutive passes through the RFID tag.

[0017] Preferably, in addition to calculating the elevator speed, the method also includes calculating the acceleration of the elevator.

[0018] Preferably, the acceleration of the elevator is calculated by two adjacent calculated elevator speeds and a time interval between the two calculated elevator speeds.

[0019] The present invention provides an elevator safety system, which uses the above-mentioned elevator operation health status monitoring method to monitor the elevator operation health status, including:

[0020] Multiple passive radio frequency RFID tags arranged along the hoistway to obtain the elevator location;

[0021] An MCU terminal is arranged on the top of the car, the MCU terminal includes an RFID tag reading and writing terminal and an emergency control module, the RFID tag reading and writing terminal wirelessly communicates with a passive wireless radio frequency RFID tag, the RFID tag reading and writing terminal is connected to the emergency control module, and the MCU terminal is powered by the mains and the self-generating guide wheel;

[0022] A plurality of self-generating guide wheels are arranged around the car, and the self-generating guide wheels include a motion-generating device and a battery;

[0023] The self-generating guide wheel is electrically connected to the MCU terminal.

[0024] Preferably, the self-generating guide wheel is connected to the MCU terminal via a guide rail.

[0025] Preferably, the emergency control module is connected to a safety clamp.

[0026] Preferably, the safety clamp holds the elevator guide rails with a preset torque to stop the car during braking.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] (1) The present invention utilizes the guide wheel to generate and store electricity when the guide wheel moves up and down with the elevator car. When the mains power supply is cut off or there is a sudden power outage, the guide wheel can still provide power for stopping the elevator, thereby providing safety protection.

[0029] (2) The present invention obtains the elevator position and calculates the elevator speed through multiple passive wireless radio frequency RFID tags arranged along the hoistway. According to whether the current position of the car exceeds the limit safety distance, the elevator is stopped using the elevator safety clamp to avoid the occurrence of hitting the top or squatting at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an elevator safety system according to an embodiment of the present invention, in which n0, n1, n2, np and nq are the numbers of passive wireless radio frequency RFID tags installed at different positions in the hoistway;

[0031] Figure 2 is a flow chart of a method for monitoring the health status of an elevator according to an embodiment of the present invention;

[0032] In the figure: 1-car, 2-self-generating guide wheel, 3-MCU terminal, 4-RFID tag, 5-guide rail, 6-hoistway, 7-safety clamp. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] The present invention provides a method for monitoring the health status of an elevator, comprising the following steps:

[0038] The elevator speed is calculated based on the RFID tags pre-placed in the shaft. The time when the car passes through different RFID tags can be obtained through the pre-placed RFID tags. If the position of the RFID tag is known, the elevator speed can be obtained.

[0039] If the elevator speed exceeds the preset speed, the position of the car 1 at the next moment is calculated. If the position of the car 1 at the next moment does not exceed the limit safety distance from the top and bottom of the shaft 6, an early warning is issued and the brake is activated; if the position of the car 1 at the next moment exceeds the limit safety distance, the safety clamp 7 is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued;

[0040] After the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car 1 at the next moment, the self-generating device activates the safety clamp 7 to slowly stop the elevator or the self-generating device activates the safety clamp 7 to stop the elevator immediately; if the elevator slows down after the brake is activated, different methods are used to stop the elevator according to the position of the car 1 at the next moment;

[0041] The self-generating device can move up and down with the car, and generate and store electricity during movement.

[0042] According to a specific embodiment of the present invention, after the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car 1 at the next moment, the safety clamp 7 is activated by the self-generating device to slowly stop the elevator or the safety clamp 7 is activated by the self-generating device to immediately stop the elevator, which specifically includes the following steps:

[0043] After the brake is activated, if the elevator does not slow down, cut off the brake power supply to determine whether the elevator is slowing down:

[0044] If the elevator still does not slow down, it is determined whether the position of the car 1 exceeds the limit safety distance from the top and bottom of the shaft 6 at the next moment. If not, the self-generating device starts the safety clamp 7 to slowly stop the elevator. If it exceeds, the self-generating device starts the safety clamp 7 to stop the elevator immediately.

[0045] If the elevator has slowed down, the safety clamp 7 is activated by the self-generating device to stop the elevator under the premise of ensuring safety.

[0046] According to a specific implementation scheme of the present invention, after the brake is activated, if the elevator slows down, it is determined whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6. If not, the self-generating device starts the safety clamp 7 to slowly stop the elevator. During the operation, it is determined whether the current floor is level. If it is level, the elevator is stopped and the door is opened to let people in. If it is not level, it is repeatedly determined whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6 until it is level and the elevator is stopped to let people in, or the self-generating device starts the safety clamp 7 to stop the elevator immediately when it exceeds the limit safety distance.

[0047] According to a specific embodiment of the present invention, calculating the elevator speed includes the following steps:

[0048] Obtaining the passage time of the car 1 according to the RFID tag 4 pre-placed in the hoistway;

[0049] Calculate the displacement of car 1 through the position of the RFID tag;

[0050] The elevator speed is calculated based on the displacement of the car 1 and the time it takes for the car to pass through the RFID tag 4 twice.

[0051] According to a specific embodiment of the present invention, in addition to calculating the elevator speed, the method also includes calculating the acceleration of the elevator.

[0052] According to a specific embodiment of the present invention, the acceleration of the elevator is calculated by two adjacent calculated elevator speeds and the time interval between the two calculated elevator speeds.

[0053] The present invention provides an elevator safety system, which uses the above-mentioned elevator operation health status monitoring method to monitor the elevator operation health status, including:

[0054] A plurality of passive radio frequency RFID tags 4 arranged along the hoistway 6 for obtaining the elevator position;

[0055] An MCU terminal 3 is arranged on the top of the car 1. The MCU terminal 3 includes an RFID tag reading and writing terminal and an emergency control module. The RFID tag reading and writing terminal wirelessly communicates with a passive wireless radio frequency RFID tag 4. The RFID tag reading and writing terminal is connected to the emergency control module. The MCU terminal 3 is powered by the mains and the self-generating guide wheel 2.

[0056] A plurality of self-generating guide wheels 2 are arranged around the car 1, and the self-generating guide wheels 2 include a motion-generating electricity device and a battery;

[0057] The self-generating guide wheel 2 is electrically connected to the MCU terminal 3 .

[0058] According to a specific embodiment of the present invention, the self-generating guide wheel 2 is connected to the MCU terminal 3 via a guide rail 5 .

[0059] According to a specific embodiment of the present invention, the emergency control module is connected to the safety clamp 7 .

[0060] Example 1

[0061] The present invention provides a method for monitoring the health status of an elevator, comprising the following steps:

[0062] Calculate the elevator speed based on the RFID tags pre-placed in the hoistway;

[0063] If the elevator speed exceeds the preset speed, the position of the car 1 at the next moment is calculated. If the position of the car 1 at the next moment does not exceed the limit safety distance from the top and bottom of the shaft 6, an early warning is issued and the brake is activated; if the position of the car 1 at the next moment exceeds the limit safety distance, the safety clamp 7 is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued;

[0064] After the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car 1 at the next moment, the self-generating device activates the safety clamp 7 to slowly stop the elevator or the self-generating device activates the safety clamp 7 to stop the elevator immediately; if the elevator slows down after the brake is activated, different methods are used to stop the elevator according to the position of the car 1 at the next moment;

[0065] The self-generating device can move up and down with the car, and generate and store electricity during movement.

[0066] Example 2

[0067] The present invention provides a method for monitoring the health status of an elevator, comprising the following steps:

[0068] Calculate the elevator speed based on the RFID tags pre-placed in the hoistway;

[0069] If the elevator speed exceeds the preset speed, the position of the car 1 at the next moment is calculated. If the position of the car 1 at the next moment does not exceed the limit safety distance from the top and bottom of the shaft 6, an early warning is issued and the brake is activated; if the position of the car 1 at the next moment exceeds the limit safety distance, the safety clamp 7 is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued;

[0070] After the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car 1 at the next moment, the self-generating device activates the safety clamp 7 to slowly stop the elevator or the self-generating device activates the safety clamp 7 to stop the elevator immediately; if the elevator slows down after the brake is activated, different methods are used to stop the elevator according to the position of the car 1 at the next moment;

[0071] The self-generating device can move up and down with the car, and generate and store electricity during movement.

[0072] After the brake is activated, if the elevator does not slow down, the brake power supply is cut off, and according to the different positions of the car 1 at the next moment, the self-generating device activates the safety clamp 7 to slowly stop the elevator or the self-generating device activates the safety clamp 7 to immediately stop the elevator, which specifically includes the following steps:

[0073] After the brake is activated, if the elevator does not slow down, cut off the brake power supply to determine whether the elevator is slowing down:

[0074] If the elevator still does not slow down, it is determined whether the position of the car 1 exceeds the limit safety distance from the top and bottom of the shaft 6 at the next moment. If not, the self-generating device starts the safety clamp 7 to slowly stop the elevator. If it exceeds, the self-generating device starts the safety clamp 7 to stop the elevator immediately.

[0075] If the elevator has slowed down, the safety clamp 7 is activated by the self-generating device to stop the elevator under the premise of ensuring safety.

[0076] Furthermore, after the brake is activated, if the elevator slows down, it is determined whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6. If not, the self-generating device activates the safety clamp 7 to slowly stop the elevator. During operation, it is determined whether the current floor is level. If it is level, the elevator is stopped and the door is opened to let people in. If it is not level, it is repeatedly determined whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6 until the elevator is stopped to let people in when it is level or the self-generating device activates the safety clamp 7 to stop the elevator immediately when it exceeds the limit safety distance.

[0077] The calculation of the elevator speed includes the following steps:

[0078] The car passing time is obtained according to the RFID tag 4 pre-placed in the hoistway;

[0079] Calculate the car displacement by the position of the RFID tag 4;

[0080] The elevator speed is calculated based on the displacement of the car 1 and the time it takes for the car to pass through the RFID tag 4 twice.

[0081] Furthermore, in addition to calculating the elevator speed, the acceleration of the elevator is also calculated.

[0082] In this embodiment, the acceleration of the elevator is calculated by using two adjacent calculated elevator speeds and the time interval between the two calculated elevator speeds.

[0083] Example 3

[0084] like Figure 1 As shown, the present invention provides an elevator safety system, which uses the above-mentioned elevator operation health status monitoring method to monitor the elevator operation health status, including:

[0085] A plurality of passive radio frequency RFID tags 4 arranged along the hoistway 6 for obtaining the elevator position;

[0086] An MCU terminal 3 is arranged on the top of the car 1. The MCU terminal 3 includes an RFID tag reading and writing terminal and an emergency control module. The RFID tag reading and writing terminal wirelessly communicates with a passive wireless radio frequency RFID tag 4. The RFID tag reading and writing terminal is connected to the emergency control module. The MCU terminal 3 is powered by the mains and the self-generating guide wheel 2.

[0087] A plurality of self-generating guide wheels 2 are arranged around the car 1, and the self-generating guide wheels 2 include a motion-generating electricity device and a battery;

[0088] The self-generating guide wheel 2 is electrically connected to the MCU terminal 3 .

[0089] Example 4

[0090] like Figure 1 As shown, the present invention provides an elevator safety system, which uses the above-mentioned elevator operation health status monitoring method to monitor the elevator operation health status, including:

[0091] A plurality of passive radio frequency RFID tags 4 arranged along the hoistway 6 for obtaining the elevator position;

[0092] An MCU terminal 3 is arranged on the top of the car 1. The MCU terminal 3 includes an RFID tag reading and writing terminal and an emergency control module. The RFID tag reading and writing terminal wirelessly communicates with a passive wireless radio frequency RFID tag 4. The RFID tag reading and writing terminal is connected to the emergency control module. The MCU terminal 3 is powered by the mains and the self-generating guide wheel 2.

[0093] A plurality of self-generating guide wheels 2 are arranged around the car 1, and the self-generating guide wheels 2 include a motion-generating electricity device and a battery;

[0094] The self-generating guide wheel 2 is electrically connected to the MCU terminal 3 via a guide rail 5;

[0095] The emergency control module is connected to the safety clamp 7 .

[0096] When the safety clamp brakes, it holds the elevator guide rail with a preset torque to stop the car. The preset torque is set according to the distance between the current car and the brake stop position.

[0097] like Figure 2 As shown, the elevator operation health status monitoring method used by the elevator safety system specifically includes the following steps:

[0098] Step S0, obtaining the current car position through the RFID tag;

[0099] Step S1, calculating the elevator speed;

[0100] Step S2, if the elevator speed exceeds the preset speed, execute step S2, if the elevator speed does not exceed the preset speed, execute step S1;

[0101] Step S3, calculating the position of car 1 at the next moment;

[0102] Step S4, determining whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6, if it does not exceed the limit safety distance, executing step S5, if it exceeds the limit safety distance, executing step S11;

[0103] Step S5, warning and activating the brake;

[0104] Step S6, determining whether the car 1 is decelerating, if the car 1 is decelerating, executing step S9, if the car 1 is not decelerating, executing step S7;

[0105] Step S7, alarm and cut off the brake power supply. The brake in the elevator will lock the guide rail when the power is off;

[0106] Step S8, determining whether the position of the car 1 at the next moment exceeds the limit safety distance from the top and bottom of the shaft 6, if it exceeds the limit safety distance, executing step S11; if it does not exceed the limit safety distance, executing step S9;

[0107] Step S9, starting the safety clamp 7 by self-generation to slowly decelerate;

[0108] Step S10: Determine whether the current floor is level. If yes, stop the elevator and open the door to let people in, alarm and wait for repair, and end the process; if no, execute step S8;

[0109] Step S11: Activate the safety clamp 7 to stop the elevator immediately. If the limit safety distance is set large enough, the elevator can also be stopped when leveling.

[0110] Step S12: Alarm, stop the elevator and wait for help, and end the process.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for monitoring the health status of an elevator, characterized in that: The steps include: Calculate the elevator speed based on the RFID tags pre-placed in the hoistway; If the elevator speed exceeds the preset speed, the car position at the next moment is calculated. If the car position at the next moment does not exceed the limit safety distance from the top and bottom of the shaft, an early warning is issued and the brake is activated; if the car position at the next moment exceeds the limit safety distance, the safety clamp is notified to stop the elevator immediately, the monitoring is ended, and an alarm is issued; After the brake is activated, if the elevator does not slow down, cut off the brake power supply to determine whether the elevator is slowing down: If the elevator still does not slow down, determine whether the car position exceeds the limit safety distance from the top and bottom of the shaft at the next moment. If not, the self-generating device will start the safety clamp to slowly stop the elevator. If it exceeds, the self-generating device will start the safety clamp to stop the elevator immediately. If the elevator has slowed down, the self-generating equipment will start the safety clamp to stop the elevator while ensuring safety; If the elevator decelerates after the brake is activated, it is determined whether the elevator car position exceeds the limit safety distance from the top and bottom of the shaft at the next moment. If not, the self-generating device activates the safety clamp to slowly stop the elevator. During operation, it is determined whether the elevator is currently level. If it is level, the elevator is stopped and the door is opened to let people in. If it is not level, it is repeatedly determined whether the elevator car position exceeds the limit safety distance from the top and bottom of the shaft at the next moment until it is level, the elevator is stopped to let people in, or the self-generating device activates the safety clamp to stop the elevator immediately if it exceeds the limit safety distance. The self-generating device can move up and down with the car, and generate and store electricity during movement.

2. The elevator operation health status monitoring method according to claim 1 is characterized in that: Calculating the elevator speed includes the following steps: The car passing time is obtained based on the RFID tags pre-placed in the shaft; Calculate the car displacement through the position of the RFID tag; The elevator speed is calculated based on the car displacement and the time between two consecutive passes through the RFID tag.

3. The elevator operation health status monitoring method according to claim 2 is characterized in that: In addition to calculating the elevator speed, it also includes calculating the acceleration of the elevator.

4. The elevator operation health status monitoring method according to claim 3 is characterized in that: The acceleration of the elevator is calculated by two adjacent calculated elevator speeds and the time interval between the two calculated elevator speeds.

5. An elevator safety system, characterized in that: The elevator operation health status monitoring method according to any one of claims 1 to 4 is used to monitor the elevator operation health status, comprising: Multiple passive radio frequency RFID tags arranged along the hoistway to obtain the elevator location; The MCU terminal is arranged on the top of the car, and the MCU terminal includes an RFID tag reading and writing terminal and an emergency control module. The RFID tag reading and writing terminal wirelessly communicates with the passive wireless radio frequency RFID tag, and the RFID tag reading and writing terminal is connected to the emergency control module. The MCU terminal is powered by the mains and the self-generating guide wheel. A plurality of self-generating guide wheels are arranged around the car, and the self-generating guide wheels include a motion-generating device and a battery; The self-generating guide wheel is electrically connected to the MCU terminal.

6. The elevator safety system according to claim 5, characterized in that: The self-generating guide wheel is connected to the MCU terminal via a guide rail.

7. The elevator safety system according to claim 5, characterized in that: The emergency control module is connected to the safety clamp.

8. The elevator safety system according to claim 5, characterized in that: When the safety clamp brakes, it grips the elevator guide rails with a preset torque to stop the car.

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