Elevator weighing method based on vibration signal, elevator weighing system and elevator

Abstract

The present disclosure relates to the field of elevator technology, and more specifically to an elevator weighing method based on vibration signals, an elevator weighing system, and an elevator. An elevator weighing method based on vibration signals includes: obtaining the elastic tensile stiffness K of the elevator traction rope and the empty mass G of the elevator car. K ; Determine the vertical vibration signal of the car and perform signal processing on the vertical vibration signal; Determine the length H of the traction rope at the current height of the car; Based on the elastic tensile stiffness K and the car no-load mass G K The elevator car load G is calculated by processing the vertical vibration signal. In this disclosure, the vertical vibration signal generated by the elevator car during the lifting process is collected and analyzed. According to the elastic tensile stiffness K, the car empty mass G K The load of the car can be calculated by processing the results of the traction rope length H and the vertical vibration signal, which makes it easier to determine whether the elevator is overloaded based on the load of the car.

Description

Technical Field

[0001] The present disclosure relates to the technical field of elevators, and more particularly to an elevator weighing method based on a vibration signal, an elevator weighing system, and an elevator. Background Art

[0002] In the elevator industry, real-time detection of the car load is required to determine the appropriate starting compensation for the elevator based on the car load data and to determine whether the elevator is overloaded. Summary of the Invention

[0003] In view of the above problems, the present disclosure provides an elevator weighing method based on vibration signals, an elevator weighing system, and an elevator.

[0004] According to a first aspect of the present disclosure, a method for weighing an elevator based on a vibration signal is provided, comprising: obtaining the elastic tensile stiffness K of the elevator traction rope and the no-load mass G of the elevator car; K Determine the vertical vibration signal of the car and perform signal processing on the vertical vibration signal; determine the traction rope length H at the current height of the car; according to the elastic tensile stiffness K, the no-load mass G of the car K The elevator car load G is calculated based on the processing results of the traction rope length H and the vertical vibration signal.

[0005] According to an embodiment of the present disclosure, the signal processing of the vertical vibration signal includes: performing signal processing on the vertical vibration signal to calculate the main frequency W of the undamped system n ; The calculation of the elevator car load G includes: G=K / (H*W n 2 )- G K .

[0006] According to an embodiment of the present disclosure, the vertical vibration signal is processed to calculate the main frequency W of the undamped system. n The method comprises: performing filtering processing on the vertical vibration signal;

[0007] Based on the filtered vertical vibration signal, Fourier decomposition is performed to obtain the main frequency W of the damping system d Based on the filtered vertical vibration signal envelope processing, obtain the damping coefficient ε; calculate the W n =W d / .

[0008] According to an embodiment of the present disclosure, performing envelope processing on the filtered vertical vibration signal to obtain the damping coefficient ε includes: performing Hilbert transform on the filtered vertical vibration signal to obtain an envelope line; and performing curve fitting on the envelope line to obtain the damping coefficient.

[0009] According to an embodiment of the present disclosure, determining the vertical vibration signal of the car includes:

[0010] Receive the initial vertical vibration signal of the current car; according to the initial main frequency W of the elevator n0 Confirming a signal interception time t; and performing segmented processing on the initial vertical vibration signal according to the signal interception time t to obtain the vertical vibration signal.

[0011] According to an embodiment of the present disclosure, the vertical vibration signal of the elevator is determined as follows: receiving the initial vertical vibration signal of the car; determining the vertical vibration signal of the elevator according to the main frequency W of the damping system; d Confirming a signal interception time t; and performing segmented processing on the initial vertical vibration signal according to the signal interception time t to obtain the vertical vibration signal.

[0012] According to an embodiment of the present disclosure, the elastic tensile stiffness K of the elevator traction rope and the no-load mass G of the car are obtained. K The process includes: obtaining the current parameter configuration table of the elevator, reading the elastic tensile stiffness K and the car no-load mass G in the parameter configuration table. K ; Or the elastic tensile stiffness K and the car no-load mass G K Perform calibration.

[0013] According to an embodiment of the present disclosure, the calibration of the elastic tensile stiffness K includes: controlling the car to travel to any floor; determining the length H of the traction rope at the current height of the car; placing a standard weight with a mass of m into the elevator of the car, and obtaining the sinking amount ΔL of the car; calculating the elastic tensile stiffness K = *H.

[0014] According to an embodiment of the present disclosure, determining the length H of the traction rope at the current height of the car includes: obtaining the total lifting height H of the car Q ; Get the current height information H of the car QT ; Get the distance H0 from the traction wheel to the top wheel or bottom wheel of the elevator; calculate H=H Q -H QT +H0.

[0015] According to an embodiment of the present disclosure, the method further includes: obtaining the linear density p of the compensation system; obtaining the current height information H of the car; QTCalculate the elevator car load G as follows: G=K / (H*W n 2 )- G K -p*H QT .

[0016] According to an embodiment of the present disclosure, in the process of processing the vertical vibration signal to calculate the main frequency W of the undamped system n Also includes:

[0017] Get multiple main frequencies W n , calculate the main frequency W in two adjacent operating cycles n rate of change;

[0018] The operating state of the elevator is determined according to the change rate.

[0019] A second aspect of the present disclosure provides an elevator weighing system, comprising a car; a vibration signal acquisition device for acquiring the vertical vibration signal generated by the car; a processor for analyzing and processing the vertical vibration signal; and a controller configured to execute any one of the above-mentioned elevator weighing methods based on vibration signals.

[0020] A third aspect of the present disclosure provides an elevator, comprising the elevator weighing system described above.

[0021] The elevator weighing method based on vibration signal disclosed in the present invention collects the vertical vibration signal generated by the elevator car during the lifting process, analyzes and processes the vertical vibration signal, and calculates the vertical vibration signal according to the elastic tensile stiffness K, the car no-load mass G, and the vertical vibration signal generated by the elevator car during the lifting process. K The load of the car can be calculated by processing the traction rope length H and the vertical vibration signal, which makes it easier to determine whether the elevator is overloaded based on the load of the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0023] Figure 1 The flowchart of the elevator weighing method based on the vibration signal according to the embodiment of the present disclosure is schematically shown;

[0024] Figure 2 The following schematically shows a flow chart of an embodiment of an elevator weighing method based on a vibration signal according to an embodiment of the present disclosure;

[0025] Figure 3 Schematic diagram showing the calculation of the main frequency W of the undamped system by processing the vertical vibration signal according to an embodiment of the present disclosure. nFlowchart of the specific implementation process;

[0026] Figure 4 A flowchart schematically illustrates an implementation of determining a vertical vibration signal of a car according to an embodiment of the present disclosure;

[0027] Figure 5 A flowchart schematically illustrates another embodiment of determining a vertical vibration signal of a car according to an embodiment of the present disclosure;

[0028] Figure 6 Schematically shows the main frequency W of the damping system according to an embodiment of the present disclosure. d Spectrum diagram of

[0029] Figure 7 Schematically shows a flow chart of another embodiment of an elevator weighing method based on a vibration signal according to an embodiment of the present disclosure;

[0030] Figure 8 The following schematically shows a flow chart of another embodiment of an elevator weighing method based on a vibration signal according to an embodiment of the present disclosure;

[0031] Figure 9 schematically illustrates a plot of an envelope according to an embodiment of the present disclosure;

[0032] Figure 10 Schematically shows a fitting result diagram of an envelope according to an embodiment of the present disclosure;

[0033] Figure 11 The structure diagram of the elevator weighing system according to the embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0035] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0036] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0037] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0038] Detailed background technology may include other technical issues besides the technical issues solved by the patent. Figure 1 As shown in FIG, an embodiment of the present disclosure provides an elevator weighing method based on a vibration signal, comprising steps S10 to S40: obtaining the elastic tensile stiffness K of the elevator traction rope and the no-load mass G of the car K Determine the vertical vibration signal of the car and perform signal processing on the vertical vibration signal; determine the traction rope length H at the current height of the car; according to the elastic tensile stiffness K, the no-load mass G of the car K The elevator car load G is calculated based on the processing results of the traction rope length H and the vertical vibration signal.

[0039] The method disclosed in this technology is primarily applicable to the field of elevator technology, where it is used to measure the load of an elevator car. It is understood that the application of this technology is not limited to this field. The method disclosed in this technology can be used in any scenario where the traction mass needs to be measured in a flexible traction system using a steel wire rope as an intermediate component. For example, in the field of prefabricated construction, the hoist used to lift formwork can calculate the mass of the lifted formwork using the method of this technology.

[0040] In combination with the explanation of the background technology in this disclosure, it can be understood that the method of the present disclosure has the following advantages:

[0041] The elevator weighing method based on vibration signal disclosed in the present invention collects the vertical vibration signal generated by the elevator car during the lifting process, analyzes and processes the vertical vibration signal, and calculates the vertical vibration signal based on the elastic tensile stiffness K, the car no-load mass G, and the vertical vibration signal generated by the elevator car during the lifting process. K The load of the car can be calculated by processing the results of the traction rope length H and the vertical vibration signal, which makes it easier to determine whether the elevator is overloaded based on the load of the car.

[0042] Furthermore, the inventors of this technology have discovered in production practice that existing elevator systems also have a car weighing function, which is mainly implemented in the following ways:

[0043] The contact sensor is placed on the shock-absorbing pad at the bottom of the car. This method requires that a contact sensor be installed under each shock-absorbing pad. The assembly is complicated, and the use of multiple sensors increases the cost.

[0044] Alternatively, a non-contact sensor can be installed on the lower beam at the bottom of the car. In this method, the non-contact sensor is easily affected by the overload of the car. When the car is overloaded, it is easy to cause the car position to deviate, which in turn causes inaccurate measurement of the non-contact sensor and affects the weighing results.

[0045] Alternatively, a weighing device may be installed on the guide wheel shaft of the car. However, this method makes it difficult to install the weighing device on the guide wheel shaft, and is inconvenient to assemble and maintain.

[0046] Alternatively, a weighing device may be installed at the spring of the rope end of the traction rope. In this method, a related air-avoiding structure needs to be designed for the sensing device at the rope end to achieve installation.

[0047] The acquisition of vertical vibration signals in the method disclosed herein can be achieved using a commonly used vibration sensor, which can detect vibrations during car operation and has essentially no requirements for the installation location. This effectively resolves the interference problem between the sensor installation location and the car structural components in the aforementioned elevator weighing methods, reducing the design difficulty of the elevator weighing structure. Furthermore, vertical vibration signals during car operation are mostly low-frequency vibration signals, so a low-precision vibration sensor can be used to acquire these vibration signals. Low-precision vibration sensors are relatively low in cost, thus reducing the cost of elevator weighing devices. Furthermore, because the detection principle is based on the calculation of the vertical vibration signal generated by the car, the vertical vibration signal will not be affected by the elevator's overload, and therefore the weighing detection accuracy will not be affected by the elevator's overload.

[0048] It is understandable that in the embodiments of the present disclosure, when calculating the load of the car based on the processing result of the vertical vibration signal, the processing result of the vertical vibration signal may include a variety of calculation parameters, such as:

[0049] The main frequency of the damped system obtained after processing the vertical vibration signal can be calculated based on it;

[0050] Or the main frequency of the undamped system can be further processed and calculated based on it.

[0051] It is understandable that in order to more clearly illustrate the method disclosed herein, the present embodiment mainly calculates the car load by substituting the main frequency of the undamped system. Figures 2 to 10 This implementation method is described in detail in the following. Figure 2 The flowchart of the elevator weighing method based on vibration signals according to an embodiment of the present disclosure is schematically shown.

[0052] like Figure 2 As shown, the elevator weighing method based on vibration signals of this embodiment includes operations S110 to S140.

[0053] In operation S110, the elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the car are obtained. K .

[0054] In the embodiment of the present disclosure, the elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the car are K This step is used to obtain the necessary parameters for subsequent calculation of the car load, K and G. K To facilitate subsequent calculations.

[0055] It should be noted that the elastic tensile stiffness K of the elevator traction rope in the embodiments of the present disclosure is a stiffness characteristic determined by the elastic modulus E and cross-sectional area A of the material when the traction rope is axially stretched, which directly reflects the tensile stiffness and cross-sectional geometric characteristics of the material. In some embodiments, , elastic modulus E reflects the elastic modulus of the material, the unit is , cross-sectional area A reflects the cross-sectional area of ​​the wire rope, in units of The elastic tensile stiffness K of the traction rope is the sum of the elastic tensile stiffnesses of all the steel wire ropes contained in the traction rope. The number of steel wire ropes can be one or more according to actual use needs.

[0056] In the embodiment of the present disclosure, the elastic tensile stiffness K of the elevator traction rope and the empty mass G of the car are K There are two ways to obtain:

[0057] Method 1: The elastic tensile stiffness K of the traction rope and the no-load mass G of the car can be effectively confirmed based on the supplier grade, processing manual, drawings, etc. K If the accuracy reaches the calculation requirements of this technology, the parameter configuration table of the current elevator can be directly called. If the parameter configuration table records the elastic tensile stiffness K of the elevator in the factory state and the no-load mass G of the car in advance, K , directly read the elastic tensile stiffness K and the no-load mass G of the car in the parameter configuration table K It can be used for subsequent calculations, or based on the elastic tensile stiffness K and the unloaded mass G of the car recorded in the parameter configuration table K The relevant parameters can be used to directly calculate the elastic tensile stiffness K, the empty mass G of the car K The numerical value of is also acceptable.

[0058] Method 2: The elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the car K Calibrate to reconfirm the elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the car K The value is used as input to facilitate subsequent calculations.

[0059] The calibration process of the elastic tensile stiffness K of the elevator traction rope is as follows:

[0060] In the embodiment of the present disclosure, the elevator car is controlled to travel to the ground floor; this step can be controlled by the elevator's background program, or by a person entering the elevator and pressing a button leading to the ground floor. After the elevator reaches the ground floor, the corresponding operator exits the elevator. In other embodiments, the elevator car can be controlled to stay at the required floor based on the calculated convenience.

[0061] Place a standard weight with a mass of m into the elevator car and obtain the amount of car sinking △L;

[0062] In the embodiment of the present disclosure, the mass of the standard weight placed is 75 kg. The distance from the same position on the car before and after the standard weight is placed to a selected reference surface is measured using a vernier caliper or a digital distance measuring device to calculate the car sinkage ΔL. The selected reference surface can be a floor, etc., as long as it is convenient for measurement.

[0063] Determine the length H of the traction rope at the current height of the car, and use the elastic tensile stiffness K= *H, input the above measured parameters m and △L into the above formula to calculate the elastic tensile stiffness K of the traction rope.

[0064] It should be noted that determining the length H of the traction rope at the current height of the car includes: obtaining the total lifting height H of the car Q ; Get the current height information H of the car QT , the current height information H of the car when calibrating the elastic tensile stiffness K QT It is directly related to the number of floors the car stops at during measurement and can be directly read from the elevator control system. Then obtain the distance H0 from the traction wheel to the car top wheel or car bottom wheel in the elevator. The value of H0 is fixed when the elevator is designed and can be directly obtained from the elevator system for calculation. Therefore, it can be concluded that H=H Q -H QT +H0.

[0065] Elevator no-load mass G K The calibration process is as follows:

[0066] It should be noted that the calibration process of the elevator no-load mass is carried out after the calibration of the elastic tensile stiffness K of the traction rope is completed.

[0067] It can be understood that the elevator no-load mass G K The calculation method of the elevator car load G is the same as that of this technology, so the two can use basically the same calculation steps. The difference lies in whether there is a load on the car. The basic process is as follows:

[0068] Control the elevator to travel to the bottom floor, ensure that the car is in an unloaded state, obtain the vertical vibration signal of the car in this operating state, and process the vertical vibration signal to calculate the main frequency W of the undamped system. k ; Get the current height information H of the car and calculate the elevator car load G as: G K =K / (H*W k 2 The specific implementation details of the above steps are basically the same as those in the calculation of the car load, so they will be explained in detail in the steps of the car load calculation. k It is the dominant frequency of the undamped system calculated from the vertical vibration signal when the car is unloaded.

[0069] It should be noted that the elastic tensile stiffness K and the no-load mass G mentioned above are K The calibration can be recalibrated regularly to update the above parameter status in real time to ensure the accuracy of the calculation.

[0070] In operation S120, a vertical vibration signal of the car is determined.

[0071] The vertical vibration signal in the embodiments of the present disclosure can be obtained by installing a vibration sensor, such as an accelerometer, in the car or at a location where car vibration can be detected. Because the car generates vertical vibration and lateral swing during its ascent and descent, a single-axis vibration sensor can be used to directly acquire the vertical vibration signal. Alternatively, when using a multi-axis vibration sensor, the vertical vibration signal can be selectively output by controlling the output type of the vibration sensor signal.

[0072] During the operation of the elevator, there is a period of time, such as the time from the customer entering the elevator to the time the elevator door closes. During this period of time, the vibration sensor will continuously detect the vibration state of the car. However, the most accurate time period of the car vibration signal is the vibration signal interval caused by the customer continuously entering the elevator. Therefore, it is necessary to segment the vibration signal of the car within this time period in order to more accurately measure the actual load of the car.

[0073] Figure 4 A flowchart of an implementation method for determining a vertical vibration signal of a car according to an embodiment of the present disclosure is schematically shown.

[0074] like Figure 4As shown, determining the vertical vibration signal of the car includes the following steps:

[0075] In operation S121, an initial vertical vibration signal of the current car is received.

[0076] The initial vertical vibration signal is a vibration signal collected by the vibration sensor during one operation cycle of the elevator. An operation cycle may be, for example, the time period from when a customer enters the elevator to when the elevator door closes.

[0077] In operation S122-1, according to the initial main frequency W of the elevator n0 Confirm signal interception time t.

[0078] When designing an elevator, the initial main frequency W is corresponding to the empty load of the car. n0 , based on the initial main frequency W n0 The vibration period can be calculated based on the period being the inverse of the frequency. According to the actual occurrence interval of the vertical vibration signal, the signal interception time t of the vertical vibration signal collected within a period of time can be confirmed with six to eight times the vibration period.

[0079] In operation S123-1, the initial vertical vibration signal is segmented according to the signal capture time t to obtain a vertical vibration signal. Within one operating cycle of the vertical vibration signal, the vertical vibration signal is captured at the signal capture time t. Based on previous experimental data, vibration signals within appropriate segments are selected as the vertical vibration signal for subsequent analysis and calculation.

[0080] Figure 5 A flowchart of another implementation of determining the vertical vibration signal of a car according to an embodiment of the present disclosure is schematically shown.

[0081] like Figure 5 As shown, determining the vertical vibration signal of the car includes the following steps:

[0082] In operation S121, an initial vertical vibration signal of the current car is received.

[0083] The initial vertical vibration signal is a vibration signal collected by the vibration sensor during one operation cycle of the elevator. An operation cycle may be, for example, the time period from when a customer enters the elevator to when the elevator door closes.

[0084] In operation S122-2, according to the main frequency W of the damping system of the elevator d Confirm signal interception time t.

[0085] The load of the elevator car directly affects the main frequency W d In order to obtain a more accurate vertical vibration signal, the main frequency W calculated in the previous operation cycle is used in the embodiment of the present disclosure. dAs the input in this operation cycle, the following operation describes the main frequency W of the damping system. d Specifically, the vibration period can be calculated based on the reciprocal of the frequency. Based on the actual occurrence interval of the vertical vibration signal, the signal interception time t of the vertical vibration signal collected within a period of time can be confirmed using six to eight times the vibration period.

[0086] In operation S123-2, the initial vertical vibration signal is segmented according to the signal capture time t to obtain a vertical vibration signal. Within one operating cycle of the vertical vibration signal, the vertical vibration signal is captured at the signal capture time t. Based on previous experimental data, vibration signals within appropriate segments are selected as the vertical vibration signal for subsequent analysis and calculation.

[0087] It is understandable that in the embodiment of the present disclosure, when performing the initial confirmation of the vertical vibration signal, the Figure 4 The vertical vibration signal confirmation method shown in the example, or an initial signal interception time is preset based on experience to facilitate the calculation and acquisition of the main frequency in the embodiment of the present disclosure.

[0088] At operation 130, the vertical vibration signal is processed to calculate the dominant frequency W of the undamped system. n ;

[0089] In this step, the vertical vibration signal obtained above is processed by signal analysis to calculate the main frequency W of the undamped system. n .

[0090] Figure 3 Schematic diagram showing the vertical vibration signal processing to calculate the main frequency W of the undamped system n The flowchart of the specific implementation process includes steps S131 to S134.

[0091] In operation S131, filtering is performed on the vertical vibration signal.

[0092] The obtained vertical vibration signal is input into a low-pass filter. Based on ISO 8041-2005, the filtering of the vertical vibration signal can be implemented by Matlab code.

[0093] In operation S132, Fourier decomposition is performed based on the filtered vertical vibration signal to obtain the main frequency W of the damped system. d ;

[0094] See also Figure 6 As shown in the figure, after the vertical vibration signal is filtered and Fourier decomposition is performed, we can get Figure 5The smooth spectrum curve shown in the figure, the frequency corresponding to the convex part in the middle of the spectrum curve is the main frequency W of the damped system d .

[0095] In operation S133, envelope processing is performed based on the filtered vertical vibration signal to obtain a damping coefficient ε;

[0096] The envelope processing in the embodiment of the present disclosure includes the following process:

[0097] See also Figure 9 As shown in the figure, the filtered vertical vibration signal is subjected to Hilber transform to obtain the envelope line. Specifically, the real signal can be transformed into a complex signal by constructing an analytical signal, and the original signal is used as the real part and the signal after Hilber transform is used as the imaginary part. The original signal is substituted into the formula of the analytical signal, and the absolute value of the analytical signal is the required envelope signal. The envelope line can be drawn according to the envelope signal.

[0098] See also Figure 9 As shown, the envelope obtained above is subjected to curve fitting to obtain the damping coefficient.

[0099] In operation S134, W is calculated. n =W d / , the main frequency W of the damped system obtained in the above steps d Substituting the damping system ε into the above formula, we can get the main frequency W of the undamped system. n .

[0100] In operation 140, the length H of the traction rope at the current height of the elevator car is determined, and the elevator car load G is calculated as: G = K / (H * W n 2 )- GK.

[0101] It should be noted that determining the length H of the traction rope at the current height of the car includes: obtaining the total lifting height H of the car Q ; Get the current height information H of the car QT , the current height information H of the car when measuring and calculating the car load QT It is directly related to the number of floors the car stops when the vertical vibration signal is detected and can be directly read from the elevator control system. Then, the distance H0 from the traction wheel to the car top wheel or car bottom wheel in the elevator is obtained. The value of H0 is fixed when the elevator is designed and can be directly obtained from the elevator system for calculation. Therefore, it can be concluded that H=H Q -H QT +H0.

[0102] Figure 7The flowchart of another embodiment of the elevator weighing method based on vibration signals according to an embodiment of the present disclosure is schematically shown.

[0103] In this embodiment, steps 150 and 160 are added after operation 130 to calculate the main frequency W. n The data information can be used to monitor the elevator operation status, specifically:

[0104] In operation 150, the main frequency W in a plurality of elevator operation cycles is obtained. n , calculate the main frequency W in two adjacent operating cycles n rate of change;

[0105] It can be understood that the operation cycle of the elevator can be the interval time from the elevator stopping at one floor to the next floor, or it can be directly obtained in unit time, such as once every three hours, the main frequency W generated during the operation of the elevator n In the embodiment of the present disclosure, the main frequency W n The information is processed by calculating the main frequency W obtained twice adjacently n The rate of change.

[0106] In operation 160, the operating status of the elevator is determined based on the change rate. If the change rate suddenly increases or decreases, it indicates that the status of the traction rope has changed significantly. This may be because the traction rope has aged after long-term use, resulting in a significant change in its elastic tensile stiffness K. At this time, an alarm signal can be issued to notify the elevator maintenance personnel to inspect the elevator.

[0107] Figure 8 The flowchart of another embodiment of the elevator weighing method based on vibration signals according to an embodiment of the present disclosure is schematically shown.

[0108] like Figure 8 As shown, in Figure 1 Based on the embodiment of the present invention, operation S170 is added.

[0109] It should be noted that the embodiments of the present disclosure are applicable to elevators used in high-rise buildings, which have a compensation system. Therefore, when calculating the car load, it is necessary to consider the impact of the mass of the compensation system on the car load.

[0110] In operations 110 to 130, Figure 2 The implementation method of the embodiment disclosed in is the same as that of the embodiment disclosed in, and will not be repeated in this embodiment.

[0111] In operation 170, the linear density p of the compensation system is obtained; the current height information H of the car is obtained. QT .

[0112] It should be noted that a common elevator compensation system uses a compensating wire rope installed on the car. As the car's altitude changes, the length of the compensating wire rope increases, so the length of the compensating wire rope is consistent with the current car height. When calculating the car's load, the weight of the compensating wire rope is simply subtracted.

[0113] It can be understood that the linear density of the compensation system can be the density of the compensation wire rope, which can be directly read by calling the parameter configuration table of the elevator.

[0114] In operation 140-1, the elevator car load G is calculated as: G = K / (H * Wn2) - GK - p * HQT. Substituting the above parameters into the formula, the load of the car with the compensation system can be calculated.

[0115] Figure 11 The structure diagram of the elevator weighing system according to the embodiment of the present disclosure is schematically shown.

[0116] The elevator weighing system 1 in the embodiment of the present disclosure includes a controller 11 for executing the above-mentioned elevator weighing method based on vibration signals. A car 12, a vibration signal acquisition device 13 for detecting vibration signals during the operation of the car; and a processor for analyzing and processing vertical vibration signals. The vibration signal acquisition device 13 of the present disclosure can be an acceleration sensor, and its specific implementation location can be the bottom, top, outer wall, inner wall of the box body, etc. of the car, or on the traction device outside the car, which can detect the vibration of the car.

[0117] The elevator weighing system of the disclosed embodiments can be used simultaneously on multiple elevators, such as multiple elevator systems in a building. The controller 11 can simultaneously receive vertical vibration signals generated by the vibration signal acquisition devices 13 in multiple elevators and process them separately, thereby simplifying the system complexity of the elevator system.

[0118] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0119] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or couplings are intended to fall within the scope of this disclosure.

[0120] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. An elevator weighing method based on vibration signals, characterized in that: include: Obtain the elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the car K , where the elastic tensile stiffness K is determined by the material elastic modulus and cross-sectional area of ​​the elevator traction rope; determining a vertical vibration signal of the car, and performing signal processing on the vertical vibration signal; Determine the length H of the traction rope at the current height of the car; According to the elastic tensile stiffness K, the no-load mass G of the car K , the traction rope length H and the processing result of the vertical vibration signal are used to calculate the elevator car load G; The performing signal processing on the vertical vibration signal includes: The vertical vibration signal is processed to calculate the main frequency W of the undamped system. n ; The calculation of the elevator car load G includes: G=K / (H*W n 2 )- G K ; The vertical vibration signal is processed to calculate the main frequency W of the undamped system. n include: performing filtering processing on the vertical vibration signal; Based on the filtered vertical vibration signal, Fourier decomposition is performed to obtain the main frequency W of the damping system d ; performing envelope processing based on the filtered vertical vibration signal to obtain a damping coefficient ε; Calculate W n =W d / .

2. The elevator weighing method based on vibration signal according to claim 1, characterized in that: The performing envelope processing on the filtered vertical vibration signal to obtain a damping coefficient ε includes: performing a Hilbert transform on the filtered vertical vibration signal to obtain an envelope; Curve fitting is performed on the envelope to obtain the damping coefficient ε.

3. The elevator weighing method based on vibration signal according to claim 1, characterized in that: Determining the vertical vibration signal of the car includes: receiving an initial vertical vibration signal of the current car; According to the initial main frequency W of the elevator n0 Confirm signal interception time t; The initial vertical vibration signal is segmented and processed according to the signal interception time t to obtain the vertical vibration signal.

4. The elevator weighing method based on vibration signals according to claim 1, characterized in that: Determining the vertical vibration signal of the current elevator includes: receiving an initial vertical vibration signal of the current car; According to the main frequency W of the damping system d Confirmation signal interception time t; The initial vertical vibration signal is segmented and processed according to the signal interception time t to obtain the vertical vibration signal.

5. The elevator weighing method based on vibration signal according to claim 1, characterized in that: The elastic tensile stiffness K of the elevator traction rope and the unloaded mass G of the elevator car are obtained. K include: Obtain the current parameter configuration table of the elevator, and read the elastic tensile stiffness K and the car no-load mass G in the parameter configuration table. K ;or The elastic tensile stiffness K and the unloaded mass G of the car K Perform calibration.

6. The elevator weighing method based on vibration signals according to claim 5, characterized in that: The calibration of the elastic tensile stiffness K comprises: Control the car to travel to any floor; Determine the length H of the traction rope at the current height of the car; Placing a standard weight with a mass of m into the elevator of the car and obtaining the sinking amount ΔL of the car; Calculate the elastic tensile stiffness K= *H.

7. The elevator weighing method based on vibration signals according to claim 5, characterized in that: Determining the length H of the traction rope at the current height of the car includes: Get the total lifting height H of the car Q ; Get the current height information H of the car QT ; Obtaining the distance H0 from the traction wheel to the car top wheel or the car bottom wheel in the elevator; Calculate H=H Q -H QT +H0.

8. The elevator weighing method based on vibration signals according to claim 1, characterized in that: Also includes: Get the linear density p of the compensation system; Get the current height information H of the car QT ; The elevator car load G is calculated as: G=K / (H*W n 2 )- G K -p*H QT .

9. The elevator weighing method based on vibration signals according to any one of claims 1 to 8, characterized in that: In the process of processing the vertical vibration signal to calculate the main frequency W of the undamped system n Also includes: Get multiple main frequencies W n , calculate the main frequency W in two adjacent operating cycles n rate of change; The operating state of the elevator is determined according to the change rate.

10. An elevator weighing system, characterized in that: include: Car; a vibration signal collecting device for collecting the vertical vibration signal generated by the car; a processor, configured to analyze and process the vertical vibration signal; A controller is configured to execute the elevator weighing method based on vibration signals according to any one of claims 1 to 9.

11. An elevator, characterized in that: The invention comprises the elevator weighing system described in claim 10.

Images