A control method and control system for an escalator

Abstract

The present application provides a control method and control system for an escalator, which performs multi-scale decomposition on the collected gear meshing vibration signal to obtain multiple empirical mode signal components, and determines the polarization vector of the gear meshing from the polarization characteristics of the gear meshing of each empirical mode signal component; determines the abnormal meshing vibration intensity under different vibration modes based on the abnormal vibration data of the reduction box, and determines the abnormal cost of the gear meshing by the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box; and adjusts the running speed of the escalator based on the polarization vector of the gear meshing and the abnormal cost of the gear meshing. The above scheme can be used to extract the abnormal vibration characteristics of the gears in the escalator reduction box based on the meshing vibration energy of the gears, and accurately judge the threat level of the abnormal vibration of the gears in the escalator reduction box, so as to improve the safety and reliability of the escalator operation control.

Description

Technical Field

[0001] The present application relates to the technical field of escalator control, and more specifically, to a control method and a control system for an escalator. Background Art

[0002] An escalator is a type of transportation equipment that uses an electric mechanical device to continuously cycle people along a fixed route with inclined steps. It is commonly found in crowded places such as subway stations, shopping malls, airports, and railway stations. Escalators can not only improve traffic efficiency, but also reduce people's fatigue when going up and down stairs. Its operation control involves many aspects, including starting and stopping, speed control, direction control, safety monitoring, etc.

[0003] The frequency of use and the flow of people on escalators fluctuate greatly, especially during peak hours. The sharp increase in the flow of people may cause the escalator to be overloaded, increasing the risk of wear and failure of the escalator. The gearbox of the escalator is a key component, and its main function is to convert the high-speed rotation of the motor into the low-speed and high-torque output required by the escalator. The gears of the escalator gearbox are key components, and their wear and damage directly affect the safe operation of the escalator. When the gears are not worn or damaged to a high degree, they can be maintained in normal operation by strengthening lubrication and regular inspection without immediate shutdown for maintenance, which can not only save maintenance costs, but also reduce the impact on the normal use of the escalator. However, in the prior art, the traditional abnormal vibration diagnosis depends on the experience of the maintenance personnel, and there may be a risk of subjective misjudgment. In addition, the causes of abnormal vibration of the gears of the escalator gearbox are complex and diverse, and the escalator control system cannot accurately diagnose the abnormal vibration and deal with it in time. Therefore, how to extract the abnormal vibration characteristics of the gears in the escalator gearbox based on the meshing vibration energy of the gears, and accurately judge the threat level of the abnormal vibration of the gears in the escalator gearbox, so as to improve the safety and reliability of the escalator operation control, has become a difficult problem faced by the industry. Summary of the invention

[0004] The present application provides a control method and control system for an escalator, which can extract the abnormal vibration characteristics of gears in the escalator reduction box based on the meshing vibration energy of the gears, and accurately determine the threat level of the abnormal vibration of the gears in the escalator reduction box, so as to improve the safety and reliability of the escalator operation control.

[0005] In a first aspect, the present application provides a method for controlling an escalator, comprising the following steps:

[0006] Collect the gear meshing vibration signal of the reduction box in the escalator;

[0007] Performing multi-scale decomposition on the gear meshing vibration signal to obtain multiple empirical mode signal components of the reduction box gear, respectively determining the polarization characteristics of the gear meshing corresponding to each empirical mode signal component, and determining the polarization vector of the gear meshing in the escalator reduction box from the polarization characteristics of all gear meshings;

[0008] Acquire abnormal vibration data of the reduction box of the escalator, determine the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box, and determine the abnormal cost of the meshing of the gears in the reduction box of the escalator through the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box;

[0009] The running speed of the escalator is adjusted according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

[0010] In some embodiments, respectively determining the polarization characteristics of the gear meshing corresponding to each empirical mode signal component specifically includes:

[0011] For each empirical mode signal component, performing a discrete transformation on the empirical mode signal component to obtain a transformation component corresponding to the empirical mode signal component;

[0012] Determining modal polarization characteristic information corresponding to the transformed component;

[0013] The polarization characteristics of the gear meshing corresponding to the empirical modal signal components are determined according to the modal polarization characteristic information corresponding to the transformed components, and then the polarization characteristics of the gear meshing corresponding to each empirical modal signal component are obtained.

[0014] In some embodiments, a gear meshing vibration signal of a reduction box in an escalator is collected by a monitoring sensor.

[0015] In some embodiments, the gear meshing vibration signal is decomposed at multiple scales using empirical wavelet decomposition.

[0016] In some embodiments, determining the polarization vector of the gear meshing in the escalator reduction box from the polarization characteristics of all gear meshings is to use the characteristic vector composed of the polarization characteristics of all gear meshings as the polarization vector of the gear meshing in the escalator reduction box.

[0017] In some embodiments, determining the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the reduction box abnormal vibration data specifically includes:

[0018] Determining abnormal vibration characteristics of gears in the reduction box according to the abnormal vibration data of the reduction box;

[0019] For different vibration modes, extract the abnormal vibration data of the gears under the vibration mode from the abnormal vibration data of the reduction box;

[0020] Determine the abnormal vibration characteristics of the gear in the reduction box under the vibration mode through the abnormal vibration data of the gear;

[0021] Based on the abnormal vibration characteristics of the gear and the abnormal vibration characteristics of the mode, the abnormal meshing vibration intensity of the gear in the reduction box under the vibration mode is determined, and then the abnormal meshing vibration intensity of the gear in the reduction box under different vibration modes is obtained.

[0022] In some embodiments, adjusting the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing specifically includes:

[0023] Determining the meshing threat degree of the reduction box in the escalator according to the gear meshing polarization vector and the gear meshing abnormality cost;

[0024] The running speed of the escalator is adjusted based on the engagement threat level.

[0025] In a second aspect, the present application provides a control system for an escalator, including an operation control unit, wherein the operation control unit includes:

[0026] A collection module is used to collect the gear meshing vibration signal of the reduction box in the escalator;

[0027] A processing module is used to perform multi-scale decomposition on the gear meshing vibration signal to obtain multiple empirical mode signal components of the gear of the reduction box, respectively determine the polarization characteristics of the gear meshing corresponding to each empirical mode signal component, and determine the polarization vector of the gear meshing in the escalator reduction box from the polarization characteristics of all gear meshings;

[0028] The processing module is further used to obtain abnormal vibration data of the reduction box of the escalator, determine the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box, and determine the abnormal cost of the meshing of the gears in the reduction box of the escalator through the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box;

[0029] The execution module is used for adjusting the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

[0030] In a third aspect, the present application provides a computer device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned escalator control method.

[0031] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions or codes, and when the instructions or codes are run on a computer, the computer implements the above-mentioned escalator control method when executing.

[0032] The technical solution provided by the embodiments disclosed in this application has the following beneficial effects:

[0033] In a control method and control system for an escalator provided by the present application, a gear meshing vibration signal of a reduction box in the escalator is collected; the gear meshing vibration signal is multi-scale decomposed to obtain multiple empirical mode signal components of the reduction box gears, and the polarization characteristics of the gear meshing corresponding to each empirical mode signal component are determined respectively, and the polarization vector of the gear meshing in the escalator reduction box is determined from the polarization characteristics of all gear meshings; abnormal vibration data of the escalator reduction box is obtained, and the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes is determined based on the abnormal vibration data of the reduction box, and the abnormal cost of the gear meshing in the escalator reduction box is determined by the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box; the running speed of the escalator is adjusted according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

[0034] It can be seen that in the present application, the abnormal vibration characteristics of the gears in the escalator reducer can be extracted based on the meshing vibration energy of the gears, and the threat level of the abnormal vibration of the gears in the escalator reducer can be accurately determined; wherein, the different scale characteristics of the gear meshing vibration signal can be captured through multi-scale decomposition, and those hidden faults that are not obvious in the overall gear meshing vibration signal but are significant in a specific frequency band or scale can be identified, so that the subtle changes and potential vibration modes in the gear meshing can be revealed based on the polarization vector of the gear meshing, which is convenient for more accurate gear fault diagnosis; then, by analyzing the abnormal meshing vibration intensity under different vibration modes, the specific effects of various faults on the gears of the reducer can be understood in detail, so that new vibration modes and change trends can be discovered in time, and the abnormal cost of gear meshing can be calculated, so that the impact of each vibration mode on the escalator can be quantified, and based on the abnormal cost evaluation results of the gear meshing, the escalator can be repaired in a targeted manner, reducing unnecessary maintenance time and improving maintenance efficiency; finally, the running speed of the escalator is adjusted in real time based on the polarization vector of the gear meshing and the abnormal cost of the gear meshing to ensure the safety of the escalator equipment and passengers. To sum up, the technical solution adopted in this application can extract the abnormal vibration characteristics of gears in the escalator reducer based on the meshing vibration energy of the gears, and accurately judge the threat level of abnormal vibration of gears in the escalator reducer, so as to improve the safety and reliability of escalator operation control. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 is an exemplary flow chart of a method for controlling an escalator according to some embodiments of the present application;

[0037] Figure 2 is an exemplary flow chart of determining polarization characteristics of gear meshing according to some embodiments of the present application;

[0038] Figure 3 is an exemplary flow chart of determining abnormal meshing vibration intensity according to some embodiments of the present application;

[0039] Figure 4 is a schematic diagram of exemplary hardware and / or software for operating a control unit according to some embodiments of the present application;

[0040] Figure 5 It is a structural schematic diagram of a computer device for implementing an escalator control method according to some embodiments of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] The embodiment of the present application provides a control method and control system for an escalator, the core of which is to collect the gear meshing vibration signal of the gearbox in the escalator; perform multi-scale decomposition on the gear meshing vibration signal to obtain multiple empirical mode signal components of the gears of the gearbox, respectively determine the polarization characteristics of the gear meshing corresponding to each empirical mode signal component, and determine the polarization vector of the gear meshing in the escalator gearbox from the polarization characteristics of all gear meshing; obtain the abnormal vibration data of the escalator gearbox, determine the abnormal meshing vibration intensity of the gears in the gearbox under different vibration modes according to the abnormal vibration data of the gearbox, and determine the abnormal cost of the gear meshing in the escalator gearbox according to the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the gearbox; adjust the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing. The above scheme can be used to extract the abnormal vibration characteristics of the gears in the escalator gearbox according to the meshing vibration energy of the gears, and accurately judge the threat degree of the abnormal vibration of the gears in the escalator gearbox, so as to improve the safety and reliability of the escalator operation control.

[0043] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Figure 1 , which is an exemplary flow chart of an escalator control method according to some embodiments of the present application, and the escalator control method 100 mainly includes the following steps:

[0044] In step 101, a gear meshing vibration signal of a reduction box in an escalator is collected.

[0045] In specific implementation, the gear meshing vibration signal of the reduction box in the escalator can be collected by monitoring sensors; in actual implementation, first, the monitoring sensors can be installed at key parts of the reduction box of the escalator, such as the input shaft, output shaft, gear box body, etc., and the monitoring sensors should be as close to the gear meshing area as possible; the monitoring sensor in this application is a comprehensive sensor that can monitor the acceleration, running speed and displacement of the escalator; then, the gear meshing vibration signal of the reduction box in the escalator is collected by the installed monitoring sensor; it should be noted that in this application, the gear meshing vibration signal refers to the energy signal of the gear meshing vibration in the reduction box in the escalator.

[0046] It should be noted that the basic change followed by the gear meshing energy characteristic distribution of the reduction gear is periodicity, that is, within a fixed period (the time for one circular motion of the gear), the energy of the meshing vibration changes periodically, and the frequency of energy change is the reduction gear meshing frequency. When the reduction gear vibrates abnormally, it will cause the surface load or torque of the gear to change, and the gear will vibrate abnormally or change in frequency during the meshing process, which will cause the vibration energy signal of the reduction gear to jump and the phase to shift within a fixed period on the gear meshing vibration signal spectrum diagram, which is the signal amplitude modulation and frequency modulation phenomenon on the spectrum diagram; therefore, the spectrum diagram features corresponding to different gear meshing vibration signals can be comprehensively compared, so as to realize the characteristic identification of different abnormal vibrations and identify gear faults.

[0047] In step 102, the gear meshing vibration signal is subjected to multi-scale decomposition to obtain multiple empirical mode signal components of the reduction box gear, and the polarization characteristics of the gear meshing corresponding to each empirical mode signal component are determined respectively. The polarization vector of the gear meshing in the escalator reduction box is determined from the polarization characteristics of all gear meshings.

[0048] Optionally, in some embodiments, the gear meshing vibration signal is decomposed at multiple scales using empirical wavelet decomposition to obtain multiple empirical modal signal components of the reduction gearbox gear, which may be specifically obtained in the following manner, namely;

[0049] Select the empirical wavelet function;

[0050] Setting multiple frequency bands according to the frequency spectrum characteristics of the gear meshing vibration signal;

[0051] Determine a multi-scale wavelet filter through all frequency bands and the empirical wavelet function;

[0052] The gear meshing vibration signal is filtered through the multi-scale wavelet filter to obtain multiple empirical mode signal components of the reduction box gear.

[0053] In the specific implementation, first, a suitable empirical wavelet function is selected. In this application, a Gaussian wavelet function is selected. In actual implementation, other empirical wavelet functions can also be selected, which is not limited here; then, according to the spectral characteristics of the gear meshing vibration signal, multiple frequency bands are set, and each frequency band corresponds to different frequency domain characteristics, which are used to extract gear meshing vibration signal information of different scales; secondly, according to the set frequency band and empirical wavelet function, a multi-scale wavelet filter is designed, such as a bandpass filter. The multi-scale wavelet filter is used to decompose the gear meshing vibration signal. The bandwidth of the multi-scale wavelet filter should cover the set frequency band range, so that the gear meshing vibration signal can be filtered through the multi-scale wavelet filter to extract the signal components in each frequency band, that is, multiple empirical mode signal components of the reduction gear, and the empirical mode signal components represent the gear meshing vibration signal characteristics at the corresponding scale.

[0054] Preferably, in some embodiments, reference Figure 2 As shown in FIG. 1 , this figure is an exemplary flow chart for determining the polarization characteristics of gear meshing in some embodiments of the present application. In this embodiment, respectively determining the polarization characteristics of gear meshing corresponding to each empirical mode signal component can be implemented by the following steps:

[0055] First, in step 1021, for each empirical mode signal component, a discrete transformation is performed on the empirical mode signal component to obtain a transformation component corresponding to the empirical mode signal component;

[0056] Then, in step 1022, the modal polarization characteristic information corresponding to the transformed component is determined;

[0057] Finally, in step 1023, the polarization characteristics of the gear meshing corresponding to the empirical modal signal components are determined according to the modal polarization characteristic information corresponding to the transformed components, and then the polarization characteristics of the gear meshing corresponding to each empirical modal signal component are obtained.

[0058] It should be noted that, in the present application, the polarization characteristics of gear meshing are the gear meshing energy characteristics after discrete transformation when the gear of the reduction gear fails. By analyzing the polarization characteristics of the gear meshing, the gear failure type and failure risk degree of the escalator reduction gearbox can be obtained.

[0059] In a specific implementation, first, for each empirical mode signal component, the empirical mode signal component can be discretely transformed, that is, the empirical mode signal component is discretely transformed, and the transformed empirical mode signal component is calculated, so that the transformed empirical mode signal component can be used as the transformed component corresponding to the empirical mode signal component; then, the modal polarization feature information corresponding to the transformed component is determined, and the modal polarization feature information refers to the distribution of polarization energy of the transformed component in the frequency domain. For each transformed component, the polarization feature of the signal in different modes is described by calculating its energy, frequency, amplitude and other characteristics, so that the set of all polarization features is used as the modal polarization feature information corresponding to the transformed component; finally, according to the modal polarization feature information corresponding to the transformed component, the polarization feature of the gear meshing corresponding to the empirical mode signal component is determined by feature fusion of all polarization features in the modal polarization feature information corresponding to the transformed component, so as to obtain a fused feature, and the fused feature is used as the polarization feature of the gear meshing corresponding to the empirical mode signal component. The polarization feature of the gear meshing corresponding to each empirical mode signal component can be obtained in the above manner.

[0060] Optionally, in some embodiments, determining the polarization vector of the gear meshing in the escalator reducer from the polarization characteristics of all gear meshings is to use a characteristic vector composed of the polarization characteristics of all gear meshings as the polarization vector of the gear meshing in the escalator reducer; in specific implementation, the polarization characteristics of all gear meshings can be combined according to the time sequence of the corresponding empirical mode signal components to obtain a characteristic vector, and the characteristic vector can be used as the polarization vector of the gear meshing in the escalator reducer, that is, the polarization vector of the gear meshing is a characteristic vector composed of the polarization characteristics of multiple gear meshings.

[0061] It should be noted that multi-scale decomposition can capture the different scale characteristics of the gear meshing vibration signal and identify those hidden faults that are not obvious in the overall gear meshing vibration signal but are significant in a specific frequency band or scale. Therefore, the polarization vector based on the gear meshing can reveal subtle changes and potential vibration modes in the gear meshing, facilitating more accurate gear fault diagnosis.

[0062] In step 103, the abnormal vibration data of the escalator's reduction box is obtained, and the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes is determined based on the abnormal vibration data of the reduction box. The abnormal cost of gear meshing in the escalator's reduction box is determined by the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box.

[0063] In specific implementation, the abnormal vibration data of the escalator's reducer can be obtained in the database of the escalator control system; the abnormal vibration data of the reducer is descriptive data used to indicate the abnormal vibration of each part in the reducer when a reducer failure occurs, including the abnormal vibration data of the gears in the reducer.

[0064] Preferably, in some embodiments, reference Figure 3 As shown in FIG. 1 , this figure is an exemplary flow chart for determining the abnormal meshing vibration intensity in some embodiments of the present application. In this embodiment, the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes can be determined based on the abnormal vibration data of the reduction box by using the following steps:

[0065] First, in step 1031, the abnormal vibration characteristics of the gears in the reduction box are determined according to the abnormal vibration data of the reduction box;

[0066] Then, in step 1032, for different vibration modes, the abnormal vibration data of the gears in the vibration mode is extracted from the abnormal vibration data of the reduction box;

[0067] Secondly, in step 1033, the abnormal vibration characteristics of the gear in the reduction box under the vibration mode are determined through the abnormal vibration data of the gear;

[0068] Finally, in step 1034, the abnormal meshing vibration intensity of the gear in the reduction box under the vibration mode is determined based on the abnormal vibration characteristics of the gear and the abnormal vibration characteristics of the mode, and then the abnormal meshing vibration intensity of the gear in the reduction box under different vibration modes is obtained.

[0069] It should be noted that, in the present application, the abnormal meshing vibration intensity refers to the abnormal vibration intensity when the reduction gear is meshing under the corresponding vibration mode; the gear abnormal vibration characteristic is used to indicate the abnormal vibration characteristic generated by the reduction gear within a specified time period; and the mode abnormal vibration characteristic is used to indicate the abnormal vibration characteristic generated by the reduction gear under the corresponding vibration mode.

[0070] In specific implementation, first, the total number of abnormal vibrations of the gear of the reducer within a specified time period can be counted in the abnormal vibration data of the reducer, so that the ratio of the total number of abnormal vibrations to the duration of the specified time period is used as the abnormal vibration feature of the gear in the reducer; then, for different vibration modes, the abnormal vibration data of the gear in the vibration mode is extracted from the abnormal vibration data of the reducer, and the abnormal vibration data of the gear includes the number of abnormal vibrations of the gear in the vibration mode; secondly, the mode abnormal vibration feature of the gear in the reducer in the vibration mode can be determined through the abnormal vibration data of the gear, that is, the ratio of the number of abnormal vibrations of the gear of the reducer in the vibration mode to the number of abnormal vibrations of the gear of the reducer in all vibration modes can be used as the mode abnormal vibration feature of the gear in the reducer in the vibration mode; finally, the product of the abnormal vibration feature of the gear and the mode abnormal vibration feature can be used as the abnormal meshing vibration intensity of the gear in the reducer in the vibration mode, and the abnormal meshing vibration intensity of the gear in the reducer in different vibration modes can be obtained by the above method.

[0071] Preferably, in some embodiments, the abnormal cost of gear meshing in the escalator reduction box is determined by the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box, which can be specifically implemented as follows, namely:

[0072] For each vibration mode, the gear meshing hazard value in the vibration mode is determined according to the abnormal meshing vibration intensity of the vibration mode and the severity of the abnormal vibration of the reduction box, thereby obtaining the gear meshing hazard value in each vibration mode;

[0073] The abnormal cost of gear meshing in the escalator reduction box is determined by the gear mesh hazard values ​​in all vibration modes.

[0074] It should be noted that, in the present application, the abnormal cost of gear meshing is an indicator used to measure the degree of hazard caused by abnormal vibration when the reduction gear meshes; the gear meshing hazard value indicates the degree of hazard caused by abnormal gear vibration in the corresponding vibration mode; the severity indicates the probability of damage to the parts of the reduction gear caused by abnormal vibration of the reduction gear.

[0075] In the specific implementation, first, the severity table of abnormal vibration of the reducer can be set according to historical experiments and data analysis. For each vibration mode, the product of the abnormal meshing vibration intensity of the vibration mode and the severity of the abnormal vibration of the reducer can be used as the gear meshing hazard value in the vibration mode. The gear meshing hazard value in each vibration mode can be obtained in the above manner; then, the abnormal cost of gear meshing in the escalator reducer can be determined by the gear meshing hazard values ​​in all vibration modes, that is, the sum of the gear meshing hazard values ​​in all vibration modes can be used as the abnormal cost of gear meshing in the escalator reducer.

[0076] It should be noted that by analyzing the abnormal meshing vibration intensity under different vibration modes, we can understand in detail the specific impact of various abnormal vibrations on the reduction box gears, so as to timely discover new vibration modes and changing trends, and calculate the abnormal cost of gear meshing. The impact of each vibration mode on the escalator can be quantified. Based on the evaluation results of the abnormal cost of gear meshing, the escalator can be repaired in a targeted manner to reduce unnecessary maintenance time and improve maintenance efficiency.

[0077] In step 104, the running speed of the escalator is adjusted according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

[0078] Preferably, in some embodiments, the running speed of the escalator can be adjusted according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing in the following manner, namely:

[0079] Determining the meshing threat degree of the reduction box in the escalator according to the gear meshing polarization vector and the gear meshing abnormality cost;

[0080] The running speed of the escalator is adjusted based on the engagement threat level.

[0081] Optionally, in the above implementation, the meshing threat degree of the reduction gear box in the escalator is determined according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing, and the polarization vector of the gear meshing and the abnormal cost of the gear meshing are input into a pre-trained bidirectional long short-term memory network for evaluation to obtain the meshing threat degree of the reduction gear box in the escalator; it should be noted that, in the present application, the meshing threat degree is a measure for quantifying the degree of risk that will occur when the gears of the reduction gear box in the escalator vibrate abnormally, and the running speed of the escalator can be controlled based on the meshing threat degree.

[0082] Optionally, in the above embodiment, the polarization vector of the gear meshing and the abnormal cost of the gear meshing are input into a pre-trained bidirectional long short-term memory network for evaluation, and the meshing threat degree of the reduction box in the escalator can be obtained in the following manner, namely:

[0083] Get a pre-trained bidirectional LSTM network;

[0084] Taking the polarization vector of the gear meshing as input data;

[0085] Taking the abnormal cost of the gear meshing as a weight parameter;

[0086] The input data and the weight parameters are input into a pre-trained bidirectional long short-term memory network for evaluation, and the evaluation result is used as the meshing threat degree of the reduction box in the escalator.

[0087] In the specific implementation, first, a bidirectional long short-term memory network and a training set can be obtained, and then the bidirectional long short-term memory network can be trained using the training set to optimize the network parameters so that the bidirectional long short-term memory network can accurately predict the meshing threat degree; then, the polarization vector of the gear meshing can be used as input data, and the abnormal cost of the gear meshing can be used as a weight parameter to input into the pre-trained bidirectional long short-term memory network for evaluation, thereby obtaining an evaluation result, which can be used as the meshing threat degree of the reduction box in the escalator.

[0088] Optionally, in some embodiments, the running speed of the escalator can be adjusted based on the engagement threat degree in the following manner, namely:

[0089] Obtain the preset risk operation range;

[0090] When the meshing threat degree is higher than the upper limit of the risk operation range, the operation of the escalator is immediately stopped;

[0091] When the meshing threat degree is within the risk operation interval, adjusting the current operation speed of the escalator;

[0092] When the meshing threat level is lower than the lower limit of the risk operation range, the current operation speed of the escalator is maintained.

[0093] In specific implementation, first, a risk operation interval can be set according to historical experiments and data analysis. In this application, the upper limit of the risk operation interval is 0.35, and the lower limit of the risk operation interval is 0.12. Other values ​​can also be taken in real time, which are not limited here. The risk operation interval can divide the current escalator into risky operating levels; then, when the meshing threat level is higher than the upper limit of the risk operation interval, the escalator control system automatically triggers a stop command to immediately stop the escalator operation to prevent the abnormal vibration from further deteriorating and causing greater damage to passengers and escalator equipment, and records the abnormal vibration information and notifies maintenance personnel for rapid maintenance and abnormal vibration troubleshooting; when the meshing threat level is in the risk operation zone Occasionally, according to the specific meshing threat degree, the running speed of the escalator is appropriately reduced. For example, when the meshing threat degree is between 0.15 and 0.3, the running speed of the escalator is reduced by 20% to 30%. By adjusting the running speed, the load and wear of the escalator can be reduced, and the probability of failure can be reduced. While adjusting the speed, the monitoring frequency of the escalator is increased to track the changes in the meshing threat degree in real time. When the meshing threat degree is lower than the lower limit of the preset risk operating range, the control system can continue to run at the current running speed, indicating that the risk is low and no additional intervention is required. It should be noted that although the meshing threat degree is low, regular maintenance inspections should still be carried out to ensure the long-term stability and performance of the escalator equipment.

[0094] It can be seen that in the present application, the abnormal vibration characteristics of the gears in the escalator reducer can be extracted based on the meshing vibration energy of the gears, and the threat level of the abnormal vibration of the gears in the escalator reducer can be accurately determined; wherein, the different scale characteristics of the gear meshing vibration signal can be captured through multi-scale decomposition, and those hidden faults that are not obvious in the overall gear meshing vibration signal but are significant in a specific frequency band or scale can be identified, so that the subtle changes and potential vibration modes in the gear meshing can be revealed based on the polarization vector of the gear meshing, which is convenient for more accurate gear fault diagnosis; then, by analyzing the abnormal meshing vibration intensity under different vibration modes, the specific effects of various faults on the gears of the reducer can be understood in detail, so that new vibration modes and change trends can be discovered in time, and the abnormal cost of gear meshing can be calculated, so that the impact of each vibration mode on the escalator can be quantified, and based on the abnormal cost evaluation results of the gear meshing, the escalator can be repaired in a targeted manner, reducing unnecessary maintenance time and improving maintenance efficiency; finally, the running speed of the escalator is adjusted in real time based on the polarization vector of the gear meshing and the abnormal cost of the gear meshing to ensure the safety of the escalator equipment and passengers. To sum up, the technical solution adopted in this application can extract the abnormal vibration characteristics of gears in the escalator reducer based on the meshing vibration energy of the gears, and accurately judge the threat level of abnormal vibration of gears in the escalator reducer, so as to improve the safety and reliability of escalator operation control.

[0095] In addition, in another aspect of the present application, in some embodiments, the present application provides a control system for an escalator, the control system for the escalator includes an operation control unit, referring to Figure 4 , which is a schematic diagram of exemplary hardware and / or software of an operation control unit according to some embodiments of the present application, the operation control unit 400 includes: a collection module 401, a processing module 402 and an execution module 403, which are described as follows:

[0096] The acquisition module 401 in this application is mainly used to collect the gear meshing vibration signal of the reduction box in the escalator;

[0097] Processing module 402, in the present application, the processing module 402 is used to perform multi-scale decomposition on the gear meshing vibration signal to obtain multiple empirical modal signal components of the gear of the reduction box, respectively determine the polarization characteristics of the gear meshing corresponding to each empirical modal signal component, and determine the polarization vector of the gear meshing in the escalator reduction box from the polarization characteristics of all gear meshings;

[0098] It should be noted that the processing module 402 in the present application is also used to obtain the abnormal vibration data of the reduction box of the escalator, determine the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box, and determine the abnormal cost of the meshing of the gears in the reduction box of the escalator through the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box;

[0099] The execution module 403 in the present application is mainly used to adjust the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

[0100] The above describes in detail the control method and control system examples of the escalator provided by the embodiments of the present application. It can be understood that the corresponding device includes hardware structures and / or software modules corresponding to the execution of each function in order to realize the above functions. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0101] In some embodiments, the present application also provides a computer device, which includes a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned escalator control method.

[0102] In some embodiments, reference Figure 5 , the dotted line in the figure indicates that the unit or the module is optional, and the figure is a schematic diagram of the structure of a computer device according to an escalator control method provided in an embodiment of the present application. The escalator control method described in the above embodiment can be Figure 5 The computer device 500 shown in the figure is implemented, and the computer device 500 includes at least one processor 501, a memory 502 and at least one communication unit 505. The computer device 500 can be a terminal device, a server or a chip.

[0103] The processor 501 may be a general-purpose processor or a special-purpose processor. For example, the processor 501 may be a central processing unit (CPU), which may be used to control the computer device 500, execute software programs, and process data of the software programs. The computer device 500 may also include a communication unit 505 to implement signal input (reception) and output (transmission).

[0104] For example, the computer device 500 may be a chip, the communication unit 505 may be an input and / or output circuit of the chip, or the communication unit 505 may be a communication interface of the chip, and the chip may be a component of a terminal device, a network device, or other devices.

[0105] For another example, the computer device 500 may be a terminal device or a server, and the communication unit 505 may be a transceiver of the terminal device or the server, or the communication unit 505 may be a transceiver circuit of the terminal device or the server.

[0106] The computer device 500 may include one or more memories 502, on which a program 504 is stored. The program 504 can be executed by the processor 501 to generate instructions 503, so that the processor 501 performs the method described in the above method embodiment according to the instructions 503. Optionally, data (such as a target audit model) can also be stored in the memory 502. Optionally, the processor 501 can also read the data stored in the memory 502, and the data can be stored at the same storage address as the program 504, or the data can be stored at a different storage address from the program 504.

[0107] The processor 501 and the memory 502 may be provided separately or integrated together, for example, integrated on a system on chip (SOC) of the terminal device.

[0108] It should be understood that each step of the above method embodiment can be completed by a hardware-based logic circuit or software-based instructions in the processor 501. The processor 501 can be a central processing unit, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, such as discrete gates, transistor logic devices or discrete hardware components.

[0109] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0110] For example, in some embodiments, the present application also provides a computer-readable storage medium, in which instructions or codes are stored. When the instructions or codes are run on a computer, the computer implements the above-mentioned escalator control method when executing.

[0111] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0112] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A control method for an escalator, characterized in that: The steps include: Collect the gear meshing vibration signal of the reduction box in the escalator. The gear meshing vibration signal refers to the energy signal of the gear meshing vibration in the reduction box in the escalator; The gear meshing vibration signal is subjected to multi-scale decomposition to obtain multiple empirical mode signal components of the reduction box gear, and the polarization characteristics of the gear meshing corresponding to each empirical mode signal component are determined respectively, and the polarization vector of the gear meshing in the escalator reduction box is determined from the polarization characteristics of all the gear meshings; wherein a characteristic vector composed of the polarization characteristics of all the gear meshings is used as the polarization vector of the gear meshing in the escalator reduction box, and the polarization characteristics of the gear meshing are the gear meshing energy characteristics after discrete transformation when the reduction box gear fails; Acquire the abnormal vibration data of the gearbox of the escalator, determine the abnormal meshing vibration intensity of the gears in the gearbox under different vibration modes according to the abnormal vibration data of the gearbox, and determine the abnormal cost of the gear meshing in the escalator gearbox through the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the gearbox; wherein the severity indicates the probability that the abnormal vibration of the gearbox causes damage to its parts, and the abnormal cost is an indicator used to measure the degree of harm caused by abnormal vibration when the gearbox is meshing; Among them, determining the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box specifically includes: counting the total number of abnormal vibrations of the reduction box gears in a specified time period in the abnormal vibration data of the reduction box, so as to take the ratio of the total number of abnormal vibrations to the duration of the specified time period as the abnormal vibration feature of the gears in the reduction box; then, for different vibration modes, extracting the abnormal vibration data of the gears in the vibration mode from the abnormal vibration data of the reduction box, and the abnormal vibration data of the gears includes the number of abnormal vibrations of the gears in the vibration mode; secondly, determining the mode abnormal vibration feature of the gears in the reduction box under the vibration mode through the abnormal vibration data of the gears, and taking the ratio of the number of abnormal vibrations of the gears in the reduction box under the vibration mode to the number of abnormal vibrations of the gears in the reduction box under all vibration modes as the mode abnormal vibration feature of the gears in the reduction box under the vibration mode; finally, taking the product of the abnormal vibration feature of the gears and the mode abnormal vibration feature as the abnormal meshing vibration intensity of the gears in the reduction box under the vibration mode; The running speed of the escalator is adjusted according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

2. The method according to claim 1, characterized in that Determining the polarization characteristics of the gear meshing corresponding to each empirical mode signal component specifically includes: For each empirical mode signal component, performing a discrete transformation on the empirical mode signal component to obtain a transformation component corresponding to the empirical mode signal component; Determining modal polarization characteristic information corresponding to the transformed component; The polarization characteristics of the gear meshing corresponding to the empirical modal signal components are determined according to the modal polarization characteristic information corresponding to the transformed components, and then the polarization characteristics of the gear meshing corresponding to each empirical modal signal component are obtained.

3. The method according to claim 1, characterized in that The gear meshing vibration signal of the reduction box in the escalator is collected by monitoring sensors.

4. The method according to claim 1, characterized in that The gear meshing vibration signal is decomposed at multiple scales using empirical wavelet decomposition.

5. The method according to claim 1, characterized in that Adjusting the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing specifically includes: Determining the meshing threat degree of the reduction box in the escalator according to the gear meshing polarization vector and the gear meshing abnormality cost, wherein the meshing threat degree is a metric used to quantify the risk degree that will occur when the gear of the reduction box in the escalator vibrates abnormally; The running speed of the escalator is adjusted based on the engagement threat level.

6. An escalator control system, the escalator control system comprising an operation control unit, characterized in that: The operation control unit comprises: An acquisition module is used to acquire a gear meshing vibration signal of a reduction box in an escalator, wherein the gear meshing vibration signal refers to an energy signal of the gear meshing vibration in the reduction box in the escalator; A processing module is used to perform multi-scale decomposition on the gear meshing vibration signal to obtain multiple empirical mode signal components of the gear of the reduction box, respectively determine the polarization characteristics of the gear meshing corresponding to each empirical mode signal component, and determine the polarization vector of the gear meshing in the escalator reduction box from the polarization characteristics of all gear meshing; wherein a feature vector composed of the polarization characteristics of all gear meshing is used as the polarization vector of the gear meshing in the escalator reduction box, and the polarization characteristics of the gear meshing are the gear meshing energy characteristics after discrete transformation when the gear of the reduction box fails; The processing module is further used to obtain abnormal vibration data of the reduction box of the escalator, determine the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box, and determine the abnormal cost of the meshing of the gears in the reduction box of the escalator through the abnormal meshing vibration intensity under all vibration modes and the severity of the abnormal vibration of the reduction box; wherein the severity indicates the probability that the abnormal vibration of the reduction box gear causes damage to its parts, and the abnormal cost is an indicator used to measure the degree of harm caused by abnormal vibration when the reduction box gear is meshed; Among them, determining the abnormal meshing vibration intensity of the gears in the reduction box under different vibration modes according to the abnormal vibration data of the reduction box specifically includes: counting the total number of abnormal vibrations of the reduction box gears in a specified time period in the abnormal vibration data of the reduction box, so as to take the ratio of the total number of abnormal vibrations to the duration of the specified time period as the abnormal vibration feature of the gears in the reduction box; then, for different vibration modes, extracting the abnormal vibration data of the gears in the vibration mode from the abnormal vibration data of the reduction box, and the abnormal vibration data of the gears includes the number of abnormal vibrations of the gears in the vibration mode; secondly, determining the mode abnormal vibration feature of the gears in the reduction box under the vibration mode through the abnormal vibration data of the gears, and taking the ratio of the number of abnormal vibrations of the gears in the reduction box under the vibration mode to the number of abnormal vibrations of the gears in the reduction box under all vibration modes as the mode abnormal vibration feature of the gears in the reduction box under the vibration mode; finally, taking the product of the abnormal vibration feature of the gears and the mode abnormal vibration feature as the abnormal meshing vibration intensity of the gears in the reduction box under the vibration mode; The execution module is used for adjusting the running speed of the escalator according to the polarization vector of the gear meshing and the abnormal cost of the gear meshing.

7. A computer device, characterized in that: The computer device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the escalator control method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed on a computer, the computer implements the escalator control method according to any one of claims 1 to 5.

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