Elevator driving host brake detection system

Abstract

The invention discloses an elevator driving host brake detection system, which is characterized in that a brake action acquisition module can sense micro strain during action of a brake in real time by virtue of a strain gauge device and convert the micro strain into an electric signal, so that the working state of the brake can be monitored in real time, and the limitation of inspection intervals of traditional regular manual inspection and simple electrical monitoring is eliminated; the latest state can be mastered at any time; the force calculation module analyzes signals by using an advanced algorithm, accurately judges that the brake is in various complex states such as normal braking, insufficient braking force, braking jamming and spring failure according to detailed characteristics of the action of the brake, timely finds various potential faults, and improves the detection accuracy and reliability; the whole detection process from signal acquisition and processing to state judgment is automatically completed, manual intervention is not needed, the manual workload and time cost are greatly reduced, regular tedious operation of professionals is not needed, and a large amount of manpower and material resources are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the elevator detection technical field, especially to a kind of elevator drive host brake detection system. BACKGROUND

[0002] In modern city, elevator as indispensable vertical transport equipment of high-rise building, its safety and reliability are directly related to the life and property safety of passengers, elevator drive host brake as the key component of elevator safe operation, its main role is when elevator needs to stop, make elevator car reliably stop at specified position, prevent car accidental movement, therefore, it is crucial to detect the state of elevator drive host brake in real time, accurately.

[0003] Traditional elevator brake detection method mainly relies on periodic manual inspection and simple electrical monitoring: manual inspection needs professional technical personnel to periodically disassemble, check and test brake, this way not only time-consuming and laborious, and due to the existence of inspection interval, cannot master the working state of brake in real time, difficult to find some potential fault hidden danger. Simple electrical monitoring can only detect the on-off state of brake and other basic information, cannot accurately detect the action performance of brake in actual operation process, the change of braking force and other key parameters. SUMMARY

[0004] Therefore, the present application provides an elevator drive host brake detection system, which can effectively solve the defects of time-consuming and laborious, unable to master the working state of brake in real time and only detect the on-off state of brake and other basic information in the prior art.

[0005] The technical scheme of the present application is as follows:

[0006] An elevator drive host brake detection system, comprising:

[0007] A brake action acquisition module for collecting signals of brake action based on a strain gauge device;

[0008] A signal processing module for amplifying and sampling the collected brake action signals;

[0009] A computing power module for determining the current state of brake based on the amplified and sampled brake action signals to obtain brake detection results.

[0010] As a further optional scheme of the elevator drive host brake detection system, the strain gauge device comprises:

[0011] A bottom plate fixed on one side of the brake and perpendicular to the action direction of the brake, the movable distance of the bottom plate is greater than the action distance of the brake;

[0012] Strain gauge, fixed on the base plate;

[0013] Pushing part, used to press the base plate, and the action direction is the same as that of the brake.

[0014] As a further optional solution of the elevator drive host brake detection system, the signal collection based on the strain gauge device brake action specifically includes:

[0015] At the factory, the strain gauge is calibrated, and the relationship between the strain gauge output signal size and the base plate action distance is calculated and recorded;

[0016] When installing the strain gauge, in the brake braking state, adjust the pushing device to make the strain gauge position within the preset position range;

[0017] When collecting signals, measure the change of the resistance value of the strain gauge.

[0018] As a further optional solution of the elevator drive host brake detection system, the brake current state judgment processing based on the amplified and sampled processed brake action signal to obtain the brake detection result, specifically includes:

[0019] Based on the amplified and sampled processed brake action signal, the position when running to steady state for the first time after power on and the current position after steady state are obtained;

[0020] According to the position when running to steady state for the first time after power on and the current position after steady state, the current state of the brake is judged.

[0021] As a further optional solution of the elevator drive host brake detection system, the system further includes:

[0022] Fault judgment module, used to judge the fault condition of the brake.

[0023] As a further optional solution of the elevator drive host brake detection system, the judgment of the fault condition of the brake specifically includes:

[0024] When learning the brake action distance, if it exceeds the preset range, it is judged that the brake adjustment is abnormal;

[0025] When the elevator completes the first several times of braking and releasing cycles from cold start, the action distance is recorded and compared with the preset value, if it exceeds the threshold, it is judged that the brake wear exceeds the threshold;

[0026] The action distance of the brake from the braking steady state to the releasing steady state and from the releasing steady state to the braking steady state is recorded, if a certain action exceeds the normal range, it is judged that the brake is stuck, if multiple actions all exceed the threshold, it is judged that the host eccentricity is abnormal.

[0027] An elevator drive master brake detection method, specifically comprising:

[0028] Signal acquisition of brake action based on strain gauge device;

[0029] Amplification and sampling processing of the acquired brake action signal;

[0030] Brake current state judgment processing based on the amplified and sampled brake action signal to obtain brake detection results.

[0031] As a further optional solution of the elevator drive master brake detection method, the method further comprises:

[0032] Judging the fault condition of the brake.

[0033] A computing device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the above elevator drive master brake detection methods when executing the computer program.

[0034] A computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is executable by a processor to implement the steps of any one of the above elevator drive master brake detection methods.

[0035] The beneficial effects of the present application are: the brake action acquisition module acquires signals based on the strain gauge device, the strain gauge can sense the slight strain of the brake during the action process in real time and convert it into an electrical signal, which means that as long as the brake has action, the system can immediately obtain the relevant action information, realizing real-time monitoring of the working state of the brake. Compared with the traditional periodic manual inspection and simple electrical monitoring, it is no longer limited by the inspection interval and can grasp the latest working state of the brake at any time; the computing module analyzes the signals after amplification and sampling processing using advanced algorithms, can accurately judge the current state of the brake according to the detailed feature information of the brake action, such as normal braking, insufficient braking force, brake jam, spring failure and other complex states. This accurate state judgment capability enables the system to timely discover potential various faults of the brake, not just simple on-off problems, greatly improving the accuracy and reliability of detection; from the acquisition, processing to state judgment of the brake action signal, the whole process is automatically completed by the system without human intervention, which greatly reduces the workload and time cost of manual operation, improves the detection efficiency, and compared with the traditional manual inspection method, it no longer needs professional technicians to regularly perform tedious disassembly, inspection and testing work, saving a lot of manpower and material resources. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0037] Fig. 1 It is a schematic diagram of the composition of an elevator drive host brake detection system of the present application.

[0038] Fig. 2 It is a structural schematic diagram of a strain gauge device of the present application.

[0039] Fig. 3 It is a flow chart of a kind of elevator drive host brake detection method.

[0040] Fig. 4 It is a schematic diagram of the composition of a kind of computing device. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] Reference Figs. 1 to 4 A kind of elevator drive host brake detection system, including brake action acquisition module, signal processing module, algorithm module and fault judgment module, wherein:

[0043] Brake action acquisition module is used for signal acquisition of brake action based on strain gauge device, in some embodiments, the strain gauge device includes:

[0044] Bottom plate is fixed on one side of brake, and is perpendicular to the action direction of brake, the movable distance of bottom plate is greater than the action distance of brake;

[0045] Strain gauge is fixed on bottom plate;

[0046] Pushing part is used to compress bottom plate, and the action direction is the same as the action direction of brake.

[0047] Specifically, the bottom plate is fixed on the side of the brake and perpendicular to the action direction of the brake. This installation mode provides a stable base platform for the strain gauge. Since the bottom plate is perpendicular to the action direction of the brake, the bottom plate can directly and purely transmit the strain generated by the brake during the action of the brake, reducing the interference of forces in other directions, so that the strain gauge can more accurately perceive the strain condition of the brake, thereby collecting more accurate action signals. The movable distance of the bottom plate is greater than the action distance of the brake, which ensures that the bottom plate has sufficient activity space during the entire action process of the brake and will not affect the transmission of the strain of the brake due to its own activity limitation. This ensures that the strain gauge can work normally and collect the signals of the brake action completely in the entire action range of the brake, avoiding the problem of incomplete or distorted signal collection due to insufficient activity range of the bottom plate.

[0048] The strain gauge is fixed on the bottom plate and can change the resistance accordingly with the deformation of the bottom plate. Since the deformation of the bottom plate directly reflects the strain condition of the brake, the strain gauge can convert the mechanical strain of the brake into an electrical signal in real time and accurately. This direct conversion mode makes the collected signals truly reflect the action state of the brake. The strain gauge itself has high sensitivity and accuracy and can detect small strain changes. By fixing it on the bottom plate, its performance advantages can be fully utilized to accurately capture subtle changes in the brake action, thereby improving the recognition ability of the entire detection system to the state of the brake.

[0049] The pushing component is used to press the bottom plate and the action direction is the same as that of the brake. During the action of the brake, the pushing component can always maintain close contact between the bottom plate and the brake, avoiding the problem of inaccurate strain transmission due to the gap between the bottom plate and the brake. The close contact enables the strain of the brake to be more effectively transmitted to the bottom plate and then accurately perceived by the strain gauge. Through the pressing action of the pushing component, the shaking and displacement of the bottom plate during the action of the brake are reduced, making the deformation of the bottom plate more stable and regular. This helps the strain gauge to output stable electrical signals and improves the quality and reliability of the signals. It should be noted that the pushing device fixes and presses the bottom plate through screws, push pins or other similar structures, and the combination structure of the bottom plate and the strain gauge can adopt different forms as long as the bottom plate is perpendicular to the action direction of the brake and the pushing device can continuously press the bottom plate.

[0050] In some embodiments, the strain gauge device collects signals during the action of the brake, specifically including:

[0051] When leaving the factory, the strain gauge is calibrated, and the relationship between the output signal size of the strain gauge and the action distance of the bottom plate is calculated and recorded.

[0052] When installing the strain gauge, in the brake braking state, the pusher device is adjusted to make the strain gauge position within the preset position range;

[0053] When collecting the signal, the change of the resistance value of the strain gauge is measured.

[0054] Specifically, the strain gauge is calibrated at the factory, the relationship between the output signal size and the base plate action distance is calculated and recorded, and an accurate reference is established for subsequent signal collection and analysis. This step makes the measured strain gauge output signal accurately correspond to the base plate action distance in subsequent actual use, and further reflects the brake action. Through this calibration, the abstract electrical signal can be converted into a brake action parameter with actual physical meaning, providing a reliable basis for accurately judging the brake state. Since different strain gauges may have certain individual differences, factory calibration can be personalized according to the characteristics of each strain gauge, eliminating measurement errors caused by differences in strain gauge characteristics, which helps to improve the detection accuracy of the entire detection system on different brake individuals and ensures the consistency and reliability of the detection results.

[0055] When installing the strain gauge, in the brake braking state, the pusher device is adjusted to make the strain gauge position within the preset position range, so that the action range of the base plate can cover the action range of the brake. If the position of the pusher device is not adjusted properly, it may cause the brake action position to exceed the limit of the base plate action range, causing damage to the equipment or making it impossible to measure the brake full stroke action. This adjustment step effectively avoids such problems.

[0056] When collecting the signal, the change of the resistance value of the strain gauge is measured. Since the resistance change of the strain gauge is directly related to the strain of the base plate, and the strain of the base plate reflects the brake action, the brake action information can be obtained in real time by measuring the resistance change. This real-time signal collection method enables the detection system to timely grasp the dynamic changes of the brake, making real-time monitoring of the brake state possible.

[0057] It should be noted that the signal output by the strain gauge is represented by , and the base plate action distance (i.e. the brake action distance) is represented by . The following is calculated:

[0058] The following parameters are preset:

[0059] : deviation when braking or releasing; specifically, The following factors should be considered to cause the change of measurement results: the deviation of signal output of the strain gauge when being stretched / compressed by the same distance in different temperature environments; the change of action distance of the brake itself due to thermal expansion and cold shrink in different temperature environments; the difference of actual contact position of the brake block and the contact surface of the driving host, which may be caused by brake surface roundness of the driving host, eccentricity of the host shaft, load of the car, etc.;

[0060] At the factory, the strain gauge / detection switch is calibrated, and the relationship between the strain gauge output signal size and the base plate action distance is calculated and recorded: , wherein represents the base plate action distance, represents the base plate action , the change of the strain gauge output signal, and the signal output by the strain gauge in the free state is recorded ;

[0061] When installing the detection switch, in the brake state of the brake, the pusher is adjusted so that the position of the strain gauge is within the preset position range, specifically, a reasonable upper and lower limit , is set , and the maximum stroke of the brake cannot exceed the action limit of the base plate and the strain gauge;

[0062] In an embodiment, when the current is less than , greater than , the corresponding adjustment direction can be prompted through the human-machine interface;

[0063] The driving brake is braked and released times, and the position of the strain gauge output each time is calculated and recorded: , ;

[0064] In an embodiment, after the brake is released each time, the motor rotates by a certain angle, so that the sequence of can cover the case when the motor is at different mechanical angles;

[0065] The action distance of the brake is calculated and recorded: ; ;

[0066] The signal processing module is used for amplifying and sampling the collected brake action signals.

[0067] Specifically, the signal processing module includes an amplification circuit and an ADC circuit.

[0068] The computing power module is configured to determine the current state of the brake based on the amplified and sampled brake action signal, and obtain a brake detection result. In some embodiments, the determination of the current state of the brake based on the amplified and sampled brake action signal and the obtaining of the brake detection result specifically include:

[0069] Based on the amplified and sampled brake action signal, the position when running to a steady state for the first time after power-on and the current position after the steady state are obtained.

[0070] The current state of the brake is determined based on the position when running to a steady state for the first time after power-on and the current position after the steady state, and the specific steps include:

[0071] Step 1: Obtain the brake action distance L learned in the debugging stage.

[0072] Step 2: Obtain the brake braking / release state position learned in the debugging stage 、

[0073] Step 3: Obtain the deviation distance Pdeviation when braking or releasing.

[0074] Step 4: Obtain the current real-time position.

[0075] Step 5: Obtain the steady state position when the last time is in a steady state.

[0076] If the first steady state has not been entered after power-on, the data obtained in steps 2, 3, and 4 are used to determine the current state of the brake. If the first steady state has been entered after power-on, the data obtained in steps 1, 3, 4, and 5 are used to determine the current state of the brake.

[0077] Specifically, the position when running to a steady state for the first time after power-on and the current position after the steady state are obtained based on the amplified and sampled brake action signal, which can comprehensively cover different stages of the brake from starting to stable running and subsequent continuous work, and can more accurately reflect the actual action of the brake. Based on such signal acquisition position information, measurement errors caused by weak signals or interference can be reduced, the accuracy of the position information can be improved, accurate position information is an important basis for subsequent state determination, and helps to more accurately evaluate the working state of the brake.

[0078] ​According to the position after the first running to the steady state after power-on and the current position after the steady state, the change of the brake state can be acutely identified, and if there is a difference between the two positions, it may mean that the brake has an abnormality in the running process, such as wear, looseness or other faults of the brake causing the position to change. Through this comparison mode, potential problems of the brake can be found in time to avoid further deterioration of the fault.

[0079] It should be noted that during installation and debugging, the brake action position is recorded:

[0080] ;

[0081] ;

[0082] During normal operation, the action judgment includes the first running (to the steady state) after power-on and the state thereafter:

[0083] When the first running (to the steady state) after power-on, the current position is calculated:

[0084] ;

[0085] If , it is judged that the current brake is in the released state, otherwise it is judged that the current brake is in the braking state, if , it is judged that the current brake is in the braking state, otherwise it is judged that the current brake is in the released state;

[0086] After entering the first steady state (within a certain time, fluctuates less than a threshold value) after power-on, define as the position when entering the steady state last time;

[0087] When is the braking steady state, if , it is judged that the current brake is in the braking state, otherwise it is judged that the brake is in the released state, when is the released steady state, if , it is judged that the current brake is in the braking state, otherwise it is judged that the brake is in the released state.

[0088] The fault judgment module is used to judge the fault condition of the brake, and in some embodiments, the judgment of the fault condition of the brake specifically includes:

[0089] When learning the brake action distance, if it exceeds the preset range, it is judged that the brake adjustment is abnormal;

[0090] When the elevator completes the first several braking and releasing cycles from the cold state, the action distance is recorded and compared with the preset value, and if it exceeds the threshold value, it is judged that the wear of the brake exceeds the threshold value;

[0091] Record the action distance of the brake from the braking steady state to the release steady state and from the release steady state to the braking steady state, if a certain action exceeds the normal range, it is judged that the brake is stuck, and if multiple actions exceed the threshold, it is judged that the host is eccentrically abnormal.

[0092] Specifically, when learning the action distance of the brake, if it exceeds the preset range, it is judged that the brake is abnormally adjusted. During the initial installation or debugging stage of the brake, this judgment method can timely find that the action distance of the brake does not meet the requirements due to improper installation, incorrect debugging parameters, etc. For example, problems such as improper adjustment of the spring force of the brake and unreasonable setting of the brake block gap can be quickly detected through the abnormality of the action distance, so that timely adjustment can be made to ensure that the brake is in good working condition before being put into use; Brake adjustment abnormalities may affect its braking effect, such as excessive brake distance, which may cause the elevator to be unable to stop in time, posing a safety hazard. Through this judgment method, intervention can be made at an early stage of the problem to avoid safety accidents caused by brake adjustment problems and ensure the safety of elevator operation;

[0093] When the elevator completes the braking and releasing cycle for a certain number of times from the cold start, the action distance is recorded and compared with the preset value, and if it exceeds the threshold, it is judged that the wear of the brake exceeds the threshold. During the long-term use of the brake, the friction parts will gradually wear, causing the action distance to change. This dynamic monitoring method can track the wear of the brake in real time and timely detect problems of excessive wear. According to the judgment result of the wear condition, the maintenance and replacement plan of the brake can be reasonably arranged. When the wear is close to but does not exceed the threshold, spare parts can be prepared in advance and maintenance time can be arranged to avoid elevator downtime caused by sudden brake failure, reduce the impact on normal elevator operation, and reduce maintenance costs;

[0094] Record the action distance of the brake from the braking steady state to the release steady state and from the release steady state to the braking steady state, if a certain action exceeds the normal range, it is judged that the brake is stuck, and if multiple actions exceed the threshold, it is judged that the host is eccentrically abnormal.

[0095] An elevator drive host brake detection method, specifically comprising:

[0096] Signal acquisition of brake action based on strain gauge device;

[0097] Amplify and sample the collected brake action signal;

[0098] Judge the current state of the brake based on the amplified and sampled brake action signal to obtain a brake detection result.

[0099] In some embodiments, the method further comprises:

[0100] Judging the failure condition of the brake.

[0101] A computing device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above elevator drive host brake detection methods when executing the computer program.

[0102] A computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the above elevator drive host brake detection methods.

[0103] The above merely provides the preferred embodiments of the present application and not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A detection system for the brake of an elevator drive unit, characterized in that, include: The brake action acquisition module is used to acquire signals of brake action based on the strain gauge device. The signal processing module is used to amplify and sample the acquired brake action signal; The computing module is used to determine the current state of the brake based on the amplified and sampled brake action signal, and to obtain the brake detection result.

2. The elevator drive main unit brake detection system according to claim 1, characterized in that, The strain gauge device includes: The base plate is fixed to one side of the brake and perpendicular to the direction of the brake's movement. The movable distance of the base plate is greater than the movement distance of the brake. Strain gauges are fixed to the base plate; The jacking component is used to press the base plate, and its direction of movement is the same as that of the brake.

3. The elevator drive main unit brake detection system according to claim 2, characterized in that, The signal acquisition for brake actuation based on the strain gauge device specifically includes: At the factory, the strain gauges are calibrated, and the relationship between the output signal magnitude of the strain gauges and the movement distance of the base plate is calculated and recorded. When installing strain gauges, with the brake in the braking state, the position of the strain gauges is adjusted by adjusting the jacking device to ensure that the position of the strain gauges is within the preset range. During signal acquisition, the change in the resistance of the strain gauge is measured.

4. The elevator drive main unit brake detection system according to claim 3, characterized in that, The process of determining the current state of the brake based on the amplified and sampled brake action signal to obtain the brake detection result specifically includes: Based on the amplified and sampled brake action signal, the position when the brake first reaches steady state after power-on and the current position after reaching steady state are obtained. The current state of the brake is determined based on its position when it first reaches steady state after power-on and its current position after reaching steady state.

5. The elevator drive main unit brake detection system according to claim 4, characterized in that, The system also includes: The fault diagnosis module is used to determine the fault status of the brake.

6. The elevator drive main unit brake detection system according to claim 5, characterized in that, The determination of brake malfunction specifically includes: If the brake action distance exceeds the preset range when learning the brake action distance, the brake adjustment is judged to be abnormal. When the elevator completes the first few braking and releasing cycles from a cold start, the travel distance is recorded and compared with a preset value. If it exceeds the threshold, it is determined that the wear of the brake exceeds the threshold. Record the distance the brake travels from braking steady state to release steady state and from release steady state to braking steady state. If any action exceeds the normal range, the brake is judged to be stuck. If multiple actions exceed the threshold, the main unit is judged to be abnormally eccentric.

7. A method for detecting the brake of an elevator drive unit, characterized in that, Specifically, it includes: Signal acquisition for brake operation based on strain gauge device; The collected brake action signal is amplified and sampled. The brake's current state is determined based on the amplified and sampled brake action signal, and the brake detection result is obtained.

8. The elevator drive main unit brake detection method according to claim 7, characterized in that, The method further includes: Determine the fault condition of the brake.

9. A computing device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the elevator drive host brake detection method according to any one of claims 7-8.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the steps of the elevator drive host brake detection method according to any one of claims 7-8.

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