Multi-group safety gear control method and system for improving elevator safety

Abstract

The invention relates to the technical field of elevators, in particular to a multi-group safety tongs control method and system for improving elevator safety, and the method comprises the steps: obtaining the monitoring point weight of an elevator state monitoring point according to the occurrence frequency of the elevator state monitoring point in elevator historical data; according to the distance between the elevator state monitoring point and the fixed monitoring point, a real-time monitoring matrix of the elevator car is established, the continuous real-time monitoring matrix is obtained and differentiated, and a differential matrix is obtained; a first elevator real-time monitoring index is obtained according to the difference matrix and the monitoring point weight, a comprehensive monitoring index is obtained by combining a second elevator real-time monitoring index, and if the comprehensive monitoring index is larger than a triggering threshold value, safety tongs are triggered; the elevator car weight, the car falling speed when the safety tongs are triggered and the distance between the car and the ground are obtained and processed, and the minimum braking acceleration is obtained; and triggering the specific group number of safety tongs according to the minimum braking acceleration. By accurately monitoring the state of the lift car and reasonably triggering the safety tongs, the safety of the elevator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to a method and system for controlling multiple safety clamps to improve the safety of elevators. Background Art

[0002] The safety clamp is a safety device in the elevator, usually installed on the car frame or counterweight frame. It is used to stop the car urgently and clamp it on the guide rail when the speed of the elevator exceeds the speed limit set by the speed limiter, or the suspension rope breaks and loosens. It provides effective protection for the safe operation of the elevator.

[0003] Safety clamps can be divided into three types according to the different structures of their brake elements: wedge type, eccentric wheel type and roller type. According to the different stopping distances, they can be divided into instantaneous type and progressive type. The working principle of the safety clamp is that the safety clamp lever drives the speed limiter wire rope, and the tensioning wheel maintains the friction between the speed limiter wire rope and the speed limiter wheel, so that the speed of the speed limiter wheel is consistent with the running speed of the car. When the running speed of the car is greater than 115% of the rated speed, the safety clamp is triggered.

[0004] The function of the safety clamp is to protect the lives of passengers in dangerous moments. During the elevator falling process, the safety clamp needs to be triggered in time and the multiple sets of safety clamps on the elevator need to be controlled more accurately to prevent the elevator from falling. At the same time, it is to avoid the elevator decelerating too quickly and causing injuries to passengers in the car, ultimately improving the safety of the elevator in a falling state.

[0005] Therefore, a method and system for controlling multiple safety clamps to improve the safety of elevators are proposed. Summary of the invention

[0006] The object of the present invention is to provide a multi-group safety clamp control method and system for improving the safety of elevators. First, by setting elevator status monitoring points and performing data acquisition and processing, the status of the elevator during operation is monitored in real time, and when the elevator fluctuates violently, it can be accurately reflected; then, the running speed of the car is reflected by monitoring the status of the speed limiter, and finally, the comprehensive monitoring index is calculated to accurately trigger the safety clamp; after the safety clamp is triggered, a specific safety clamp group is called according to the calculated minimum braking acceleration and the weight of the elevator, thereby reducing elevator wear, increasing the service life of the elevator, and improving the safety of the elevator.

[0007] To achieve the above object, the present invention provides the following technical solutions: A method for controlling multiple safety clamps to improve elevator safety, comprising: Acquire elevator structure data and select elevator status monitoring points according to the elevator structure data; Furthermore, the elevator status monitoring point and the fixed monitoring point include: High-speed cameras are arranged at fixed intervals in the elevator shaft to photograph the elevator status monitoring points to obtain photographed images, and the four vertex corners of the photographed images are set as the fixed monitoring points; The monitoring points include counterweight monitoring points, safety clamp monitoring points and guide rail monitoring points.

[0008] Acquire elevator historical data and obtain the monitoring point weight of the elevator status monitoring point according to the occurrence frequency of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; Furthermore, the monitoring point weights include: The weight of the first monitoring point is obtained according to the frequency of occurrence of the elevator status monitoring point in the elevator maintenance data; the weight of the second monitoring point is obtained according to the frequency of occurrence of the elevator status monitoring point in the similar elevator accident data; The first monitoring point weight and the second monitoring point weight are obtained and processed to obtain the monitoring point weight. The calculation formula of the monitoring point weight is: ; in, Indicates The monitoring point weight of each of the elevator status monitoring points, Indicates The number of times the elevator status monitoring point appears in the maintenance data, Indicates The number of times the elevator status monitoring point appears in the maintenance data, represents the number of elevator status monitoring points, represents the number of events of maintenance data, and Represents the weight coefficient, satisfying ; Indicates The number of times the elevator status monitoring point appears in the accident data, Indicates The number of times the elevator status monitoring point appears in the accident data, represents the number of events in the accident data, and Represents the weight coefficient, satisfying ; and Represents the weight coefficient, satisfying .

[0009] Establishing a real-time monitoring matrix of the car according to the distance between the elevator status monitoring point and the fixed monitoring point, obtaining the continuous real-time monitoring matrix and performing differentiation to obtain a differential matrix; obtaining a first elevator real-time monitoring index according to the differential matrix and the monitoring point weight; Furthermore, the first elevator real-time monitoring index includes: Acquire a photographed image of the elevator state monitoring point on the elevator in the running state, and calculate the distance between the elevator state monitoring point and the four fixed monitoring points to obtain a state vector of the elevator state monitoring point; merge the state vectors of all the elevator state monitoring points to obtain the real-time monitoring matrix; Acquire the real-time monitoring matrix collected twice in succession and perform difference to obtain the difference matrix; The elements of the difference matrix and the weights of the monitoring points are obtained and processed to obtain the first elevator real-time monitoring index. The calculation formula of the first elevator real-time monitoring index is: ; in, represents the first elevator real-time monitoring indicator, represents the number of elevator status monitoring points, Indicates The monitoring point weight of each of the elevator status monitoring points, represents the first Line Elements of a column.

[0010] The speed and acceleration of the speed limiter are obtained and processed to obtain a second elevator real-time monitoring index; the first elevator real-time monitoring index and the second elevator real-time monitoring index are obtained and processed to obtain a comprehensive monitoring index; if the comprehensive monitoring index is greater than a trigger threshold, the safety clamp is triggered; Furthermore, the second elevator real-time monitoring index includes: The speed and acceleration of the speed limiter are obtained and processed to obtain the second elevator real-time monitoring index. The calculation formula of the second elevator real-time monitoring index is: ; in, represents the real-time monitoring index of the second elevator, Indicates the speed limiter operating speed The weight coefficient of Indicates the speed limiter operating acceleration The weight coefficient of .

[0011] Furthermore, the comprehensive monitoring indicators include: The calculation formula of the comprehensive monitoring index is: ; in, represents the comprehensive monitoring index, represents the weight coefficient of the first elevator real-time monitoring indicator, Represents the weight coefficient of the second elevator real-time monitoring indicator.

[0012] The weight of the elevator car, the falling speed of the car when the safety clamp is triggered, the distance between the car and the ground and the safety buffer distance are obtained and processed to obtain the minimum braking acceleration; Furthermore, the minimum braking acceleration includes: Get the distance between the car and the ground and safety buffer distance And process to get the maximum braking distance ; The car falling speed and the maximum braking distance when the safety clamp is triggered are obtained and processed to obtain the minimum braking acceleration. The calculation formula of the minimum braking acceleration is: ; in, represents the minimum braking acceleration, Indicates the car falling speed when the safety clamp is triggered.

[0013] If the minimum braking acceleration is greater than the preset braking acceleration, the safety clamp group is triggered according to the first triggering mode; Furthermore, the first triggering mode includes: If the absolute value of the minimum braking acceleration is greater than the preset braking acceleration The absolute value of is , braking is performed according to the minimum braking acceleration; The total force balance equation is: ; in, Indicates the weight of the car. Indicates the absolute value of braking acceleration, Indicates the number of safety clamp groups. Indicates the absolute value of the average braking force of a single set of safety clamps. Indicates the absolute value of gravitational acceleration; The calculation formula for the average braking force of a single set of safety clamps is: in, Indicates the average braking force of a single set of safety gear. represents the braking force coefficient, Indicates the rated load of the elevator. Indicates the car's own weight. represents the acceleration due to gravity; The braking acceleration is the minimum braking acceleration, and the calculation formula for triggering the number of safety clamp groups is: ; in, It means taking the integer part of the value and adding 1. Indicates the number of safety clamp groups in the first triggering mode.

[0014] If the minimum braking acceleration is less than or equal to the preset braking acceleration, the safety clamp assembly is triggered according to the second triggering mode.

[0015] Furthermore, the second triggering mode includes: If the absolute value of the minimum braking acceleration is less than or equal to the preset braking acceleration The absolute value of the braking acceleration is used, and braking is performed according to the preset braking acceleration. The calculation formula for the number of safety clamp groups triggered is: ; in, It means taking the integer part after calculation and adding 1. Indicates the number of safety clamp groups in the second triggering mode. Indicates the absolute value of the preset braking acceleration.

[0016] The present invention also provides a multi-group safety clamp control system for improving elevator safety, comprising: A monitoring point processing module is used to obtain elevator structure data and select elevator status monitoring points according to the elevator structure data; obtain elevator historical data and obtain the monitoring point weight of the elevator status monitoring point according to the occurrence frequency of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; The comprehensive monitoring module includes a first monitoring unit, a second monitoring unit and a comprehensive monitoring unit, wherein the first monitoring unit establishes a real-time monitoring matrix of the car according to the distance between the elevator status monitoring point and the fixed monitoring point, obtains the continuous real-time monitoring matrix and performs differential to obtain a differential matrix; obtains the first elevator real-time monitoring index according to the differential matrix and the monitoring point weight; the second monitoring unit obtains the speed and acceleration of the speed limiter and processes them to obtain the second elevator real-time monitoring index; the comprehensive monitoring unit obtains the first elevator real-time monitoring index and the second elevator real-time monitoring index and processes them to obtain a comprehensive monitoring index; if the comprehensive monitoring index is greater than a preset comprehensive monitoring index threshold, the safety clamp is triggered; The minimum braking acceleration calculation module is used to obtain and process the elevator car weight, the car falling speed when the safety clamp is triggered, the distance between the car and the ground and the safety buffer distance to obtain the minimum braking acceleration; The safety clamp trigger module includes a judgment unit, a first trigger unit and a second trigger unit, wherein the judgment unit is used to judge whether the minimum braking acceleration is greater than the preset braking acceleration. If the minimum braking acceleration is greater than the preset braking acceleration, the first trigger unit is entered and the safety clamp group is triggered according to the first trigger mode; if the minimum braking acceleration is less than or equal to the preset braking acceleration, the second trigger unit is entered and the safety clamp group is triggered according to the second trigger mode.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. By selecting key points on the elevator as monitoring points, comprehensive monitoring of the car's operating status is achieved; the weight of the monitoring point is calculated by the frequency of the monitoring point in the maintenance data and accident data to ensure greater sensitivity to changes in important monitoring points; a real-time monitoring matrix is ​​established based on the collected data, and a differential matrix is ​​further obtained. Finally, the first elevator real-time monitoring indicator is calculated to reflect the car's operating status in real time, which improves the monitoring capability of the car status and provides data support for the precise triggering of subsequent safety clamps.

[0018] 2. By monitoring and processing the speed and acceleration of the speed limiter, the second elevator real-time monitoring index is obtained, which can reflect the change in the elevator's operating speed; by combining the first elevator real-time monitoring index and the second elevator real-time monitoring index, the elevator's operating status and the speed limiter's status change are comprehensively considered to optimize the triggering of the safety clamp, thereby improving the reliability and accuracy of the safety clamp triggering decision and enhancing the sensitivity of the safety clamp triggering.

[0019] 3. When the elevator falls at a high speed, multiple sets of safety clamps are triggered according to the minimum braking acceleration in the first triggering mode to ensure rapid response and shorten the sliding distance as much as possible to prevent serious accidents caused by falling too fast; when the elevator falls at a low speed, multiple sets of safety clamps are triggered according to the preset braking acceleration in the second triggering mode to avoid impact injuries to passengers caused by excessive braking; by dynamically selecting the triggering mode and reasonably allocating the number of safety clamps, not only the risk of personal injury in accidents is reduced, but also the cost of equipment operation and maintenance is reduced, and the overall safety of the elevator is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flowchart of a method for controlling multiple safety clamps to improve elevator safety provided by an embodiment of the present invention; Figure 2 A schematic diagram of a structure for triggering a safety clamp group according to acceleration provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a multi-group safety clamp control system for improving elevator safety provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0022] Embodiment 1

[0023] A tourist attraction is planning to build a large sightseeing elevator on a cliff during project development. It not only needs to meet transportation needs, but also needs to take into account safety, landscape effects and environmental protection. The specific elevator parameters are shown in Table 1. In order to ensure the safety of the elevator, the engineering construction unit introduced a multi-group safety clamp control method for improving the safety of the elevator provided by the present invention. The specific implementation method is as follows: First, the structural data of the large sightseeing elevator is obtained and the elevator status monitoring points are selected according to the elevator structural data to obtain the elevator status monitoring point set; Table 1. Specific parameters of large sightseeing elevators

[0024] Furthermore, in order to comprehensively improve the safety and monitoring accuracy of the elevator during operation, the layout and design of the elevator status monitoring points need to cover the key components of the elevator car, and the elevator status monitoring points include: Monitoring points are set on the four sides of the elevator, including counterweight monitoring points, safety clamp monitoring points and guide rail monitoring points, among which the counterweight monitoring points are used to monitor the balance state and running trajectory of the counterweight, the safety clamp monitoring points monitor the working state of the safety clamp, and the guide rail monitoring points focus on monitoring the position deviation of the guide rail; Furthermore, traction machine monitoring points and guide wheel monitoring points may be set up to monitor the working status of components.

[0025] Furthermore, a dynamic load sensor may be provided and installed under the car floor to detect the real-time load weight and distribution in the car.

[0026] Furthermore, high-speed cameras are arranged at fixed intervals in the elevator shaft to photograph the elevator status monitoring points to obtain photographed images.

[0027] Furthermore, the four corners of the captured image are set as fixed monitoring points.

[0028] Elevator status monitoring points are set at key locations of the elevator, covering the main structure and operating components of the elevator, ensuring that the real-time status of key components can be fully monitored, improving the accuracy of monitoring, and enhancing the reliability of the system.

[0029] Acquire and process elevator historical data to obtain the monitoring point weight of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; Furthermore, the monitoring point weights include: Acquire elevator maintenance data, and obtain a first monitoring point weight according to the frequency of occurrence of the elevator status monitoring point in the elevator maintenance data; Acquire similar elevator accident data, and obtain a second monitoring point weight according to the frequency of occurrence of the elevator status monitoring point in the similar elevator accident data; The first monitoring point weight and the second monitoring point weight are obtained and processed to obtain the monitoring point weight. The calculation formula of the monitoring point weight is: ; in, Indicates The monitoring point weight of each of the elevator status monitoring points, Indicates The number of times the elevator status monitoring point appears in the maintenance data, Indicates The number of times the elevator status monitoring point appears in the maintenance data, represents the number of elevator status monitoring points, represents the number of events of maintenance data, and Represents the weight coefficient, satisfying ; Indicates The number of times the elevator status monitoring point appears in the accident data, Indicates The number of times the elevator status monitoring point appears in the accident data, represents the number of events in the accident data, and Represents the weight coefficient, satisfying ; represents the weight coefficient of the first monitoring point weight, The weight coefficient of the second monitoring point satisfies .

[0030] By obtaining the historical data of the elevator and obtaining the monitoring point weights of the elevator status monitoring points based on the elevator maintenance data and similar elevator accident data, it is possible to enhance the supervision of key parts of the elevator that are prone to failure during operation, improve the accuracy and reliability of the monitoring points, and provide data support for the subsequent calculation of the first elevator real-time monitoring indicators.

[0031] Establishing a real-time monitoring matrix of the elevator according to the distance between the elevator status monitoring point and the fixed monitoring point, performing differentiation on the real-time monitoring matrix to obtain a differential matrix; obtaining a first elevator real-time monitoring index according to the differential matrix and the monitoring point weights; Furthermore, a high-speed camera in the elevator shaft shoots the elevator status monitoring point to obtain a captured image, and the specific position of the elevator status monitoring point can be displayed on the image through a sensor arranged at the elevator status monitoring point.

[0032] Furthermore, the real-time monitoring matrix includes: Acquire a photographed image of the elevator state monitoring point of the elevator in the running state, calculate the distance between the elevator state monitoring point and the fixed monitoring points of four vertices in the image, obtain the state vector of the elevator state monitoring point, and merge the state vectors of all the elevator state monitoring points to obtain the real-time monitoring matrix; Obtain the real-time monitoring matrix collected twice in succession and And process it to get the difference matrix ; The elements of the difference matrix and the weights of the monitoring points are obtained and processed to obtain the first elevator real-time monitoring index. The calculation formula of the first elevator real-time monitoring index is: ; in, represents the first elevator real-time monitoring indicator, represents the number of elevator status monitoring points, Indicates The monitoring point weight of each of the elevator status monitoring points, represents the first Line Elements of a column.

[0033] Furthermore, as shown in Table 2, data of the first elevator real-time monitoring index of the elevator monitored within a certain period of time is shown, and no abnormality is found therein.

[0034] The first elevator real-time monitoring indicator reflects the state change of the elevator at fixed intervals of displacement when it is in operation. If the elevator runs smoothly, the value of the first elevator real-time monitoring indicator will be smaller. If the elevator shakes violently, for example, before the traction rope of the elevator breaks, the elevator will shake left and right. At this time, the first elevator real-time monitoring indicator will become larger, which can accurately reflect the state of the car before the car falls, improve the sensitivity of fault detection, and shorten the time for the safety clamp to trigger.

[0035] Table 2. Real-time monitoring indicators of the first elevator

[0036] Obtain and process the data of the speed limiter to obtain the real-time monitoring index of the second elevator; Furthermore, the second elevator real-time monitoring index includes: The speed and acceleration of the speed limiter are obtained and processed to obtain the second elevator real-time monitoring index. The calculation formula of the second elevator real-time monitoring index is: ; in, represents the real-time monitoring index of the second elevator, Indicates the speed limiter operating speed The weight coefficient of Indicates the speed limiter operating acceleration The weight coefficient of .

[0037] The function of the speed limiter is to keep consistent with the running speed of the elevator car and limit the running speed of the car. By obtaining the speed and acceleration of the speed limiter and combining it with the weight coefficient to calculate the second elevator real-time monitoring index, the running status of the elevator can be accurately monitored, safety can be improved, and the accuracy and efficiency of the safety clamp triggering can be improved.

[0038] Acquire and process the first elevator real-time monitoring index and the second elevator real-time monitoring index to obtain a comprehensive monitoring index, and trigger the safety clamp according to the comprehensive monitoring index; Furthermore, the calculation formula of the comprehensive monitoring index is: ; in, represents the comprehensive monitoring index, Indicates the first elevator real-time monitoring index The weight coefficient of Indicates the second elevator real-time monitoring index The weight coefficient of Furthermore, historical data is obtained and processed, and a trigger threshold is obtained according to the data of the elevator fall accident; if the comprehensive monitoring index is greater than the trigger threshold, the safety clamp is triggered to brake the elevator. Table 3 shows the comprehensive monitoring index within a certain period of time, from which it is found that none of them exceeds the trigger threshold 1, indicating no abnormality.

[0039] The first elevator real-time monitoring indicator reflects whether the operating status of the elevator car is stable. Before a fall occurs, the first elevator real-time monitoring indicator will suddenly increase. The second elevator real-time monitoring indicator reflects the operating speed of the elevator. If a fall occurs, the second elevator real-time monitoring indicator will suddenly increase. The comprehensive monitoring indicator obtained by the first and second elevator real-time monitoring indicators takes into account the advantages of both and improves the accuracy and reliability of the safety clamp triggering.

[0040] Table 3. Comprehensive monitoring indicators

[0041] The weight of the elevator car, the falling speed of the car when the safety clamp is triggered, the distance between the car and the ground and the safety buffer distance are obtained and processed to obtain the minimum braking acceleration; Furthermore, the minimum braking acceleration includes: Use sensors to obtain the distance between the car and the ground and safety buffer distance And process to get the maximum braking distance. The calculation formula of the maximum braking distance is: ; in, Indicates the maximum braking distance.

[0042] Furthermore, the car falling speed and the maximum braking distance when the safety clamp is triggered are obtained and processed to obtain the minimum braking acceleration, and the calculation formula of the minimum braking acceleration is: ; in, represents the minimum braking acceleration, Indicates the car falling speed when the safety clamp is triggered.

[0043] By considering the weight of the car, the falling speed and the maximum braking distance, the required minimum braking acceleration can be accurately calculated. If the braking acceleration is less than the minimum braking acceleration, the car may hit the ground, causing a serious safety accident. The minimum braking acceleration can ensure that when the safety clamp is triggered, the elevator completes braking within the maximum braking distance, thereby preventing the elevator from continuing to fall or exceeding the safety distance and protecting the safety of passengers.

[0044] If the minimum braking acceleration is greater than the preset braking acceleration, the safety clamp group is triggered according to the first triggering mode; Furthermore, the first triggering mode includes: If the absolute value of the minimum braking acceleration is greater than the preset braking acceleration If the absolute value of the minimum braking acceleration is obtained, braking is performed according to the minimum braking acceleration.

[0045] Furthermore, the calculation formula of the average braking force of the single set of safety clamps is: ; in, represents the braking force coefficient, Indicates the rated load of the elevator. Indicates the car's own weight. represents the acceleration due to gravity; Furthermore, the total force balance equation is: ; in, Indicates the weight of the car, including the weight of the car itself, passengers and other parts. Indicates the absolute value of braking acceleration, Indicates the number of safety clamp groups. Indicates the absolute value of the average braking force of a single set of safety clamps. Indicates the absolute value of gravitational acceleration; Furthermore, in this case, the absolute value of the braking acceleration is the absolute value of the minimum braking acceleration , the calculation formula for the number of triggered safety clamp groups is: ; in, It means taking the integer part of the value and adding 1. Indicates the number of safety clamp groups in the first triggering mode.

[0046] Furthermore, braking is performed according to the calculated number of safety clamp groups that need to be triggered.

[0047] Excessive use of safety clamps will cause excessive braking, resulting in injuries to passengers in the car, and may also cause excessive wear of the elevator's mechanical parts. Through optimization calculations, the minimum but sufficient number of safety clamp groups is maintained, allowing the elevator to stop effectively and smoothly in an emergency, ensuring that the impact force during braking is minimized, ensuring passenger safety, reducing the wear of the elevator's mechanical parts, extending the elevator's service life, and improving the safety of the elevator.

[0048] If the absolute value of the minimum braking acceleration is less than or equal to the absolute value of the preset braking acceleration, the safety clamp assembly is triggered according to the second triggering mode.

[0049] Furthermore, the second triggering mode includes: If the absolute value of the minimum braking acceleration is less than or equal to the absolute value of the preset braking acceleration , braking is performed according to the preset braking acceleration, and the calculation formula for the number of safety clamp groups triggered is: ; in, It means taking the integer part after calculation and adding 1. Indicates the number of safety clamp groups for the second triggering mode.

[0050] Furthermore, braking is performed according to the calculated number of safety clamp groups that need to be triggered.

[0051] When the minimum braking acceleration is less than or equal to the preset braking acceleration, the safety clamp group is triggered based on the preset braking acceleration to ensure that the braking force just meets the demand, avoiding excessive braking force caused by excessive triggering of the safety clamp, resulting in severe shaking of the elevator or damage to components, as well as injuries to passengers in the car, thereby improving the safety of the elevator.

[0052] Table 4 shows the simulation results of the elevator fall simulation experiment. The preset braking acceleration is 3m / s 2 If the minimum braking acceleration shown in the table is less than the preset braking acceleration, the first trigger mode is used, according to the acceleration of 3m / s 2 Braking is performed. From the data in the table, it can be seen that a multi-group safety clamp control method for improving elevator safety provided by the present invention can well provide braking force for the elevator.

[0053] Table 4. Multiple simulation results

[0054] An embodiment of the present invention provides a multi-group safety clamp control method for improving elevator safety. Through a first elevator real-time monitoring indicator and a second elevator real-time monitoring indicator, accurate monitoring of the car state and the speed limiter state is achieved, thereby improving the accuracy of the safety clamp triggering and shortening the safety clamp triggering time. In addition, the braking force provided by the safety clamp group is reasonably set according to the minimum braking acceleration, which can prevent the occurrence of elevator fall incidents and ensure that passengers in the car will not be accidentally injured due to excessive braking force, thereby improving the safety of the elevator.

[0055] Embodiment 2 In this embodiment, a multi-group safety clamp control system is provided to improve the safety of the elevator. The system structure is as follows: Figure 3 As shown, the specific implementation is as follows: A monitoring point processing module is used to obtain elevator structure data and select elevator status monitoring points according to the elevator structure data; obtain elevator historical data and obtain the monitoring point weight of the elevator status monitoring point according to the occurrence frequency of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; Furthermore, the calculation formula of the monitoring point weight is: ; in, Indicates The monitoring point weight of each of the elevator status monitoring points, Indicates The number of times the elevator status monitoring point appears in the maintenance data, Indicates The number of times the elevator status monitoring point appears in the maintenance data, represents the number of elevator status monitoring points, represents the number of events of maintenance data, and Represents the weight coefficient, satisfying ; Indicates The number of times the elevator status monitoring point appears in the accident data, Indicates The number of times the elevator status monitoring point appears in the accident data, represents the number of events in the accident data, and Represents the weight coefficient, satisfying ; represents the weight coefficient of the first monitoring point weight, The weight coefficient of the second monitoring point satisfies .

[0056] The comprehensive monitoring module includes a first monitoring unit, a second monitoring unit and a comprehensive monitoring unit, wherein the first monitoring unit establishes a real-time monitoring matrix of the car according to the distance between the elevator status monitoring point and the fixed monitoring point, obtains the continuous real-time monitoring matrix and performs a difference to obtain a difference matrix; obtains the first elevator real-time monitoring index according to the difference matrix and the monitoring point weight; Furthermore, the calculation formula of the first elevator real-time monitoring index is: ; in, represents the first elevator real-time monitoring indicator, represents the number of elevator status monitoring points, Indicates The monitoring point weight of each of the elevator status monitoring points, represents the first Line Elements of a column.

[0057] The second monitoring unit obtains and processes the speed and acceleration of the speed limiter to obtain a second elevator real-time monitoring index; Furthermore, the calculation formula of the second elevator real-time monitoring index is: ; in, represents the real-time monitoring index of the second elevator, Indicates the speed limiter operating speed The weight coefficient of Indicates the speed limiter operating acceleration The weight coefficient of .

[0058] Table 5 shows the real-time monitoring indicators of the second elevator collected by the second monitoring unit of a certain elevator over a period of time, and no abnormality is found therein.

[0059] Table 5. Real-time monitoring indicators of the second elevator

[0060] The comprehensive monitoring unit obtains and processes the first elevator real-time monitoring index and the second elevator real-time monitoring index to obtain a comprehensive monitoring index; if the comprehensive monitoring index is greater than a preset comprehensive monitoring index threshold, the safety clamp is triggered; Furthermore, as shown in Table 6, the comprehensive monitoring indicators collected by the comprehensive monitoring unit of a certain elevator over a period of time did not exceed the trigger threshold 2, and no abnormality was found.

[0061] The minimum braking acceleration calculation module is used to obtain and process the weight of the elevator car, the falling speed of the car when the safety clamp is triggered, the distance between the car and the ground, and the safety buffer distance to obtain the minimum braking acceleration; Table 6. Comprehensive monitoring indicators

[0062] The safety clamp triggering module includes a judgment unit, a first triggering unit and a second triggering unit, wherein the judgment unit is used to judge whether the minimum braking acceleration is greater than the preset braking acceleration, and if the minimum braking acceleration is greater than the preset braking acceleration, the first triggering unit is entered and the safety clamp group is triggered according to the first triggering mode; Furthermore, in this case, the absolute value of the braking acceleration is the absolute value of the minimum braking acceleration , the calculation formula for the number of triggering safety clamp groups is: ; in, It means taking the integer part of the value and adding 1. Indicates the number of safety clamp groups in the first triggering mode, Indicates the weight of the elevator car, represents the absolute value of gravitational acceleration, represents the braking force coefficient, Indicates the rated load of the elevator. Indicates the car's own weight. Represents the acceleration due to gravity.

[0063] If the minimum braking acceleration is less than or equal to the preset braking acceleration, the second triggering unit is entered and the safety clamp group is triggered according to the second triggering mode.

[0064] Furthermore, if the absolute value of the minimum braking acceleration is less than or equal to the absolute value of the preset braking acceleration , braking is performed according to the preset braking acceleration, and the calculation formula for the number of safety clamp groups triggered is: ; in, It means taking the integer part after calculation and adding 1. Indicates the number of safety clamp groups for the second triggering mode.

[0065] Furthermore, braking is performed according to the calculated number of safety clamp groups that need to be triggered.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling multiple safety clamps to improve elevator safety, characterized in that: include: Acquire elevator structure data and select elevator status monitoring points according to the elevator structure data; Acquire elevator historical data and obtain the monitoring point weight of the elevator status monitoring point according to the occurrence frequency of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; Establishing a real-time monitoring matrix of the car according to the distance between the elevator status monitoring point and the fixed monitoring point, obtaining the continuous real-time monitoring matrix and performing differentiation to obtain a differential matrix; Obtaining a first elevator real-time monitoring index according to the difference matrix and the monitoring point weights; The speed and acceleration of the speed limiter are obtained and processed to obtain a second elevator real-time monitoring index; the first elevator real-time monitoring index and the second elevator real-time monitoring index are obtained and processed to obtain a comprehensive monitoring index; if the comprehensive monitoring index is greater than a trigger threshold, the safety clamp is triggered; The weight of the elevator car, the falling speed of the car when the safety clamp is triggered, the distance between the car and the ground and the safety buffer distance are obtained and processed to obtain the minimum braking acceleration; If the minimum braking acceleration is greater than the preset braking acceleration, the safety clamp group is triggered according to the first triggering mode; If the minimum braking acceleration is less than or equal to the preset braking acceleration, the safety clamp assembly is triggered according to the second triggering mode.

2. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The elevator status monitoring point and the fixed monitoring point include: High-speed cameras are arranged at fixed intervals in the elevator shaft to photograph the elevator status monitoring points to obtain photographed images, and the four vertex corners of the photographed images are set as the fixed monitoring points; The monitoring points include counterweight monitoring points, safety clamp monitoring points and guide rail monitoring points.

3. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The monitoring point weights include: The weight of the first monitoring point is obtained according to the frequency of occurrence of the elevator status monitoring point in the elevator maintenance data; the weight of the second monitoring point is obtained according to the frequency of occurrence of the elevator status monitoring point in the similar elevator accident data; The first monitoring point weight and the second monitoring point weight are obtained and processed to obtain the monitoring point weight. The calculation formula of the monitoring point weight is: ； in, Indicates The monitoring point weight of each of the elevator status monitoring points, Indicates The number of times the elevator status monitoring point appears in the maintenance data, Indicates The number of times the elevator status monitoring point appears in the maintenance data, represents the number of elevator status monitoring points, represents the number of events of maintenance data, and Represents the weight coefficient, satisfying ; Indicates The number of times the elevator status monitoring point appears in the accident data, Indicates The number of times the elevator status monitoring point appears in the accident data, represents the number of events in the accident data, and Represents the weight coefficient, satisfying ; and Represents the weight coefficient, satisfying .

4. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The first elevator real-time monitoring indicator includes: Acquire a photographed image of the elevator state monitoring point on the elevator in the running state, and calculate the distance between the elevator state monitoring point and the four fixed monitoring points to obtain a state vector of the elevator state monitoring point; merge the state vectors of all the elevator state monitoring points to obtain the real-time monitoring matrix; Acquire the real-time monitoring matrix collected twice in succession and perform difference to obtain the difference matrix; The elements of the difference matrix and the weights of the monitoring points are obtained and processed to obtain the first elevator real-time monitoring index. The calculation formula of the first elevator real-time monitoring index is: ； in, represents the first elevator real-time monitoring indicator, represents the number of elevator status monitoring points, Indicates The monitoring point weight of each of the elevator status monitoring points, represents the first Line Elements of a column.

5. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The second elevator real-time monitoring indicator includes: The speed and acceleration of the speed limiter are obtained and processed to obtain the second elevator real-time monitoring index. The calculation formula of the second elevator real-time monitoring index is: ； in, represents the real-time monitoring index of the second elevator, Indicates the speed limiter operating speed The weight coefficient of Indicates the speed limiter operating acceleration The weight coefficient of .

6. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The comprehensive monitoring indicators include: The calculation formula of the comprehensive monitoring index is: ； in, represents the comprehensive monitoring index, represents the weight coefficient of the first elevator real-time monitoring indicator, Represents the weight coefficient of the second elevator real-time monitoring indicator.

7. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The minimum braking acceleration includes: Get the distance between the car and the ground and safety buffer distance And process to get the maximum braking distance ; The car falling speed and the maximum braking distance when the safety clamp is triggered are obtained and processed to obtain the minimum braking acceleration. The calculation formula of the minimum braking acceleration is: ； in, represents the minimum braking acceleration, Indicates the car falling speed when the safety clamp is triggered.

8. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The first triggering mode includes: If the absolute value of the minimum braking acceleration is greater than the preset braking acceleration The absolute value of is , braking is performed according to the minimum braking acceleration; The total force balance equation is: ； in, Indicates the weight of the car. Indicates the absolute value of braking acceleration, Indicates the number of safety clamp groups. Indicates the absolute value of the average braking force of a single set of safety clamps. Indicates the absolute value of gravitational acceleration; The calculation formula for the average braking force of a single set of safety clamps is: ； in, Indicates the average braking force of a single set of safety gear. represents the braking force coefficient, Indicates the rated load of the elevator. Indicates the car's own weight. represents the acceleration due to gravity; The braking acceleration is the minimum braking acceleration, and the calculation formula for triggering the number of safety clamp groups is: ； in, It means taking the integer part of the value and adding 1. Indicates the number of safety clamp groups in the first triggering mode.

9. A method for controlling multiple safety clamps for improving elevator safety according to claim 1, characterized in that: The second triggering mode includes: If the absolute value of the minimum braking acceleration is less than or equal to the preset braking acceleration The absolute value of the braking acceleration is used, and braking is performed according to the preset braking acceleration. The calculation formula for the number of safety clamp groups triggered is: ； in, It means taking the integer part after calculation and adding 1. Indicates the number of safety clamp groups in the second triggering mode. Indicates the absolute value of the preset braking acceleration.

10. A multi-group safety clamp control system for improving elevator safety, characterized in that: include: A monitoring point processing module, used to obtain elevator structure data and select elevator status monitoring points according to the elevator structure data; Acquire elevator historical data and obtain the monitoring point weight of the elevator status monitoring point according to the occurrence frequency of the elevator status monitoring point, wherein the elevator historical data includes elevator maintenance data and similar elevator accident data; The comprehensive monitoring module includes a first monitoring unit, a second monitoring unit and a comprehensive monitoring unit, wherein the first monitoring unit establishes a real-time monitoring matrix of the car according to the distance between the elevator status monitoring point and the fixed monitoring point, obtains the continuous real-time monitoring matrix and performs differential to obtain a differential matrix; obtains the first elevator real-time monitoring index according to the differential matrix and the monitoring point weight; the second monitoring unit obtains the speed and acceleration of the speed limiter and processes them to obtain the second elevator real-time monitoring index; the comprehensive monitoring unit obtains the first elevator real-time monitoring index and the second elevator real-time monitoring index and processes them to obtain a comprehensive monitoring index; if the comprehensive monitoring index is greater than a preset comprehensive monitoring index threshold, the safety clamp is triggered; The minimum braking acceleration calculation module is used to obtain and process the elevator car weight, the car falling speed when the safety clamp is triggered, the distance between the car and the ground and the safety buffer distance to obtain the minimum braking acceleration; The safety clamp trigger module includes a judgment unit, a first trigger unit and a second trigger unit, wherein the judgment unit is used to judge whether the minimum braking acceleration is greater than the preset braking acceleration. If the minimum braking acceleration is greater than the preset braking acceleration, the first trigger unit is entered and the safety clamp group is triggered according to the first trigger mode; if the minimum braking acceleration is less than or equal to the preset braking acceleration, the second trigger unit is entered and the safety clamp group is triggered according to the second trigger mode.

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