WO2020119470A1 - Online prediction system and method for remaining service life of elevator traction steel wire rope - Google Patents

Abstract

An online prediction system and method for the remaining service life of an elevator traction steel wire rope (10). The system comprises: a detection module comprising an oscillator (4) and a detection device and used for monitoring in real time, by means of eddy current detection, an elevator traction steel wire rope (10) in operation; a signal conditioning module (6) connected to the detection module and used for converting monitored data into a detection signal; and an analysis and evaluation module (5) connected to the signal conditioning module (6) and used for comparing the collected detection signal with information, pre-stored in a database, of different degrees of wear and service lives of the elevator traction steel wire rope (10) so as to predict the service life of the detected elevator traction steel wire rope (10). Whether the elevator traction steel wire rope (10) in operation has a defect is monitored in real time by means of eddy current detection, and the remaining service life of the elevator traction steel wire rope (10) is predicted by means of signal comparison, thereby providing effective information for timely repair and replacement of the elevator traction steel wire rope (10). Therefore, the present invention has an important significance in safe elevator operation.

Description

Online prediction system and method for remaining life of elevator traction wire rope Technical field

The invention belongs to the technical field of non-destructive testing of elevators, and particularly relates to an online prediction system and method for the remaining life of elevator traction wire ropes.

Background technique

With the rapid development of high-rise buildings in recent years, the society's demand for the number of elevators is increasing day by day. As one of the main components to ensure the safety of elevators, elevator traction wire ropes usually have internal and external wear, wire breakage, and fatigue after a period of use. , Rust and other damage, thus threatening the stability of elevator performance and the safety of users. Therefore, real-time monitoring of the traction rope and timely detection of the damage of the wire rope, so as to predict the remaining life of the wire rope, is crucial for the timely replacement of the wire rope. However, at present, most of the detection of the traction wire rope still depends on labor, and it needs to be stopped to perform, which cannot be guaranteed in terms of detection time and accuracy.

Summary of the invention

Based on the above deficiencies of the prior art, the technical problem solved by the present invention is to provide an online prediction system and method for the remaining life of the elevator traction wire rope, which can accurately detect the wire rope defects, and combine the detection results to predict the life of the wire rope, thereby timely Take appropriate measures.

In order to solve the above technical problems, the present invention is implemented through the following technical solutions: The present invention provides an online prediction system for the remaining life of elevator traction wire ropes, including:

The detection module, including the oscillator and the detection device, is used for real-time monitoring of the elevator hoisting wire rope in the manner of eddy current detection;

A signal conditioning module, connected to the detection module, for converting the monitored data into a detection signal;

An analysis and evaluation module, connected to the signal conditioning module, is used to compare the collected detection signal with the information about the different degrees of wear and life of the elevator traction wire rope pre-stored in the database, thereby predicting the detected elevator traction Wire rope life.

Further, the detection device includes a fixing bracket, an insulating sleeve, a detection coil, a comparison coil, and a wire rope fixing wheel;

The fixing bracket is fixed at the elevator shaft steel structure frame close to the traction wheel, the insulating sleeve is fixed at the middle position of the fixing bracket, and at the same time, it is sheathed outside the elevator traction wire rope under test;

The comparison coil and the detection coil are respectively wound on the upper and lower sides of the outer wall of the insulating sleeve, and the oscillator is connected to the comparison coil and the detection coil;

The wire rope fixing wheel is fixed on the inner wall of the insulating sleeve by a spring, and is used to maintain the relative position of the detected part of the elevator traction wire rope and the insulating sleeve.

Further, the signal conditioning module includes a bridge, an amplifier, a detector, and a filter;

The input end of the bridge is connected to the output ends of the comparison coil and the detection coil, and is used to convert the resistance change rate of the comparison coil and the detection coil into a voltage output, which is then provided to the amplifier for measurement after amplification;

The input terminal of the amplifier is connected to the output terminal of the electric bridge, and is used to further amplify the current signal;

The input end of the detector is connected to the output end of the amplifier, and is used to take out the unidirectional envelope signal from the high-frequency amplitude-modulated wave;

The input end of the filter is connected to the output end of the detector, which is used to filter out high-frequency carrier components, make the low-frequency useful signal pure, and eliminate interference signals.

Further, the analysis and evaluation module includes an amplitude discriminator, a display and recording device, and a data evaluation and life prediction device;

The input terminal of the amplitude discriminator is connected to the output terminal of the filter, which is used to further filter noise to obtain the signal to be displayed and recorded;

The input terminal of the display and recording device is connected to the output terminal of the amplitude discriminator, and is used to display the processed signal and perform real-time recording;

The input end of the data evaluation and life prediction device is connected to the output end of the display and recording device, which is responsible for collecting the collected detection signal and the information of different degrees of wear and life of the elevator traction wire rope pre-stored in the database Make a comparison to predict the life of the elevator hoisting wire rope being tested.

Optionally, the middle of the insulating sleeve is a semi-hollow fence structure.

From the above, the internal structure of the detection module can be easily observed. Once some parts are damaged, they can be observed and replaced in time.

Optionally, the wire rope fixing wheel is disposed on an inner wall near the inlet and outlet inside the insulating sleeve.

From above, the wire rope fixing wheel fixed in this way can reduce the vibration of the detected elevator traction wire rope when passing the detection device, and improve the detection accuracy.

The invention also provides an online prediction method for the remaining life of the elevator traction wire rope, which includes the following steps:

S1, the fixing bracket of the detection device is fixed on the steel structure frame of the elevator shaft by bolts, and the elevator traction wire rope is passed through the inside of the insulating sleeve, and at the same time, it is brought into contact with the steel wire fixing wheel connected to the inner wall of the insulating sleeve through the spring ;

S2. During detection, the oscillator generates an alternating current and supplies it to the comparison coil and the detection coil. The comparison coil and the detection coil generate an alternating electromagnetic field. The alternating electromagnetic field acts on the elevator traction wire rope passing through the comparison coil and the detection coil. The elevator traction wire rope generates eddy current magnetic field feedback under the action of the electromagnetic field, thereby generating impedance on the detection coil and the comparison coil, and the bridge converts the resistance change rate of the detection coil and the comparison coil into a voltage output;

S3. Use an amplifier to amplify the impedance change of the coil, and use detectors and filters to eliminate the interference signal during the detection, and extract the required defect data;

S4. Use the amplitude discriminator to analyze the amplitude of the data, and display the relevant data through the display and recording device;

S5. Use the life data of the elevator traction wire ropes of different damage levels stored in the data evaluation and prediction device to compare, thereby predicting the working life of the detected elevator traction wire ropes.

From the above, the present invention adopts the method of eddy current detection, using the elevator traction wire rope to move up and down with the elevator car, so that it is close to the coil with current, and the alternating magnetic field established by the coil and the elevator traction wire rope Electromagnetic induction occurs and eddy currents are generated in the elevator traction wire rope. At this time, the corresponding induction magnetic field is also generated in the elevator traction wire rope and affects the original magnetic field, which in turn leads to changes in coil voltage and impedance. When the elevator traction wire rope wears out and other defects, it will affect the strength and distribution of the eddy current and cause changes in the coil voltage and impedance. After processing by the bridge, amplifier, detector, filter, amplitude discriminator, the signal will be displayed It comes out, and automatically compares with the life information of the steel wire ropes with different degrees of wear in the database, so as to predict the life of the tested elevator ropes. The invention adopts the method of eddy current detection to monitor real-time whether there are defects in the elevator traction wire rope in operation, and predicts the remaining life of the tested wire rope through signal comparison, so as to provide timely repair and replacement of the elevator traction wire rope Effective information is of great significance for the safe operation of elevators.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification, and in order to make the above and other objects, features and advantages of the present invention more obvious and understandable In the following, in conjunction with the preferred embodiments and the accompanying drawings, the detailed description is as follows.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

1 is a schematic diagram of the overall structure of the online prediction system for the remaining life of the elevator traction wire rope of the present invention;

2 is a partial structural schematic diagram of the detection device of the online prediction system for the remaining life of the elevator traction wire rope of the present invention;

Fig. 3 is a flowchart of the online prediction method of the remaining life of the elevator traction wire rope of the present invention.

In the picture: 1- elevator shaft steel structure frame, 2- fixed bracket, 3- bolt, 4- oscillator, 5- analysis and evaluation module, 6- signal conditioning module, 7- insulating sleeve, 8- detection coil, 9 -Comparison coil, 10-elevator traction wire rope, 11-wire rope fixed wheel, 12-spring, 13-bridge, 14-amplifier, 15-detector, 16-filter, 17-amplitude discriminator, 18-display and Recording device, 19-data evaluation and life prediction device.

detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. As a part of this specification, the principles of the present invention will be explained by examples, and other aspects, features, and advantages of the present invention will become clear from this detailed description. In the drawings referred to, the same or similar components in different drawings are denoted by the same reference numerals.

As shown in Figure 1-2, the present invention adopts the method of eddy current detection to monitor the elevator hoisting wire rope in operation in real time, and predicts the remaining life of the elevator hoisting wire rope to be tested through the comparison of signals. The online prediction system for the remaining life of the elevator traction wire rope of the present invention includes a detection module, a signal conditioning module 6 and an analysis and evaluation module 5.

Wherein, the detection module is used for real-time monitoring of the elevator hoisting wire rope by eddy current detection, including an oscillator 4, a detection device, the detection device includes a fixed bracket 2, an insulating sleeve 7, a detection coil 8 、Comparative coil 9 and wire rope fixed wheel 11. Among them, the fixed bracket 2 is fixed at the elevator shaft steel structure frame 1 close to the traction wheel, and the fixed bracket 2 is made of PVC hard plastic material, and the insulating sleeve 7 is fixed at the middle position of the fixed bracket 2 while being sleeved on the elevator to be tested The wire rope 10 is led out, and the insulating sleeve 7 is made of polyurethane. The middle of the insulating sleeve 7 is a semi-hollow fence structure, which is convenient for observing the internal structure of the detection module. Once some parts are damaged, it can be observed and carried out in time replace. The comparison coil 9 and the detection coil 8 are respectively wound on the upper and lower sides of the outer wall of the insulating sleeve 7, the oscillator 4 is connected to the comparison coil 9 and the detection coil 8, and the comparison coil 9 and the detection coil 8 are externally led to the signal conditioning module 6 . The wire rope fixing wheel 11 is fixed to the inner wall of the insulating sleeve 7 through a spring 12 and is responsible for maintaining the relative position of the detected portion of the elevator traction wire rope 10 and the insulating sleeve 7, wherein the wire rope fixing wheel 11 is made of polyurethane insulation material, specifically The wire rope fixing wheel 11 is provided on the inner wall near the entrance and exit of the insulating sleeve 7. The wire rope fixing wheel 11 fixed in this way can reduce the vibration of the detected elevator traction wire rope 10 when passing the detection device. Improve the accuracy of detection. The detection coil in the detection module adopts a self-comparing coil. According to the characteristic of the elevator traction wire rope defect passing through the coil, the opposite eddy current signal will be generated, thereby judging whether the wire rope is defective.

The signal conditioning module 6 of the present invention is used to convert the monitored data into a detection signal, including a bridge 13, an amplifier 14, a detector 15, and a filter 16. The input end of the bridge 13 is connected to the output ends of the comparison coil 9 and the detection coil 8 and is responsible for converting the resistance change rate ΔR/R of the comparison coil 9 and the detection coil 8 into a voltage output, which is then provided to the amplifier 14 for amplification After the measurement; the input end of the amplifier 14 is connected to the output end of the bridge 13 and is responsible for further amplification of the current signal; the input end of the detector 15 is connected to the output end of the amplifier 14 and is responsible for the amplitude modulation wave from the high frequency Take out the one-way envelope signal; the input end of the filter 16 is connected to the output end of the detector 15 and is responsible for filtering out the high-frequency carrier component, making the low-frequency useful signal pure and eliminating the interference signal.

The analysis and evaluation module 5 of the present invention includes an amplitude discriminator 17, a display and recording device 18, a data evaluation and life prediction device 19, wherein the input terminal of the amplitude discriminator 17 and the output terminal of the filter 16 are related by Connected, it is responsible for further filtering noise to obtain the signal to be displayed and recorded. The input terminal of the display and recording device 18 and the output terminal of the amplitude discriminator 17 are connected by a relevant line, which is responsible for displaying the processed signal and performing real-time recording, and the input terminal of the data evaluation and life prediction device 19 It is connected to the output of the display and recording device 18 by relevant lines, and is responsible for comparing the collected detection signals with the information of different wear levels and lifespan of the elevator traction wire rope pre-stored in the database, so as to predict the detected elevator traction Leading wire rope life.

As shown in FIG. 3, the present invention also provides an online prediction method for the remaining life of the elevator traction wire rope, which includes the following steps:

Before the detection, the fixing bracket 2 of the detection device is fixed to the steel structure 1 of the elevator shaft by bolts 3, and the elevator traction wire rope 10 is passed through the inside of the insulating sleeve 7, and at the same time, it is connected to the insulating sleeve with the spring 12 The steel wire fixed wheel 11 on the inner wall of the barrel 7 contacts.

During detection, the oscillator 4 generates an alternating current and supplies it to the comparison coil 9 and the detection coil 8. The comparison coil 9 and the detection coil 8 generate an alternating electromagnetic field. The alternating electromagnetic field acts on the elevator to be detected passing through the comparison coil 9 and the detection coil 8. The traction wire rope 10 causes the elevator traction wire rope 10 to generate eddy current magnetic field feedback under the action of the electromagnetic field, thereby generating an impedance on the detection coil 8 and the comparison coil 9, and the electric bridge 13 puts the resistance of the detection coil 8 and the comparison coil 9 The rate of change △R/R is converted into a voltage output. If the elevator traction wire rope through the comparison coil 9 and the detection coil 8 is abnormal, the change in impedance may be less than 1%. In order to clearly detect the change in impedance, the amplifier 14 is used to Amplify the impedance change of the coil. Since the coil impedance change is a comprehensive reflection of the influence of various parameters, the detector 15 and the filter 16 are used to eliminate the interference signal during the detection, the required defect data is taken out, and the amplitude discriminator 17 is used. Perform amplitude analysis on the data and display the relevant data through the display and recording device 18. At the same time, use the life data of the elevator traction wire rope 10 of different damage levels stored in the data evaluation and prediction device 19 to compare and predict The working life of the elevator traction wire rope 10 is detected.

The online prediction system of the remaining life of the elevator traction wire rope of the present invention mainly adopts the eddy current detection technology in the non-destructive detection, which can accurately detect the wire rope defects, and combined with the detection results, predicts the life of the wire rope, so as to take corresponding measures in time. The online prediction system and method for the remaining life of the elevator traction wire rope of the present invention can monitor the situation of the elevator traction wire rope in real time during the operation of the elevator. Once the signal is found to be abnormal, it can promptly prompt the alarm and automatically and pre-stored in advance. The data in the sample library of the traction wire rope wear level of the elevator is compared to predict the remaining life of the detected wire rope, which provides effective information for the repair and replacement of the traction wire rope.

The above is the preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, Several improvements and changes are made, and these improvements and changes are also regarded as the scope of protection of the present invention.

Claims (7)

1. An online prediction system for the remaining life of an elevator traction wire rope is characterized by comprising:

   The detection module, including the oscillator (4) and the detection device, is used for real-time monitoring of the elevator hoisting wire rope in the manner of eddy current detection;

   A signal conditioning module (6), connected to the detection module, for converting the monitored data into a detection signal;

   The analysis and evaluation module (5) is connected to the signal conditioning module (6), and is used to compare the collected detection signal with the information about the different degrees of wear and life of the elevator traction wire rope pre-stored in the database to predict The life of the elevator traction wire rope is tested.
2. The online prediction system for the remaining life of an elevator traction wire rope according to claim 1, characterized in that the detection device comprises a fixed bracket (2), an insulating sleeve (7), a detection coil (8), and a comparison coil (9) , And wire rope fixed wheels (11);

   The fixing bracket (2) is fixed at the elevator shaft steel structure frame (1) close to the traction sheave, the insulating sleeve (7) is fixed at the middle position of the fixing bracket (2), and is sleeved on the measured Of the elevator traction wire rope (10);

   The comparison coil (9) and the detection coil (8) are respectively wound on the upper and lower sides of the outer wall of the insulating sleeve (7), and the oscillator (4) is connected to the comparison coil (9) and the detection coil ( 8) On;

   The wire rope fixing wheel (11) is fixed to the inner wall of the insulating sleeve (7) by a spring (12), and is used to maintain the relative position of the detected portion of the elevator traction wire rope (10) and the insulating sleeve (7).
3. The online prediction system for the remaining life of an elevator hoisting rope according to claim 2, characterized in that the signal conditioning module (6) includes a bridge (13), an amplifier (14), a detector (15), and a filter (16);

   The input end of the electric bridge (13) is connected to the output ends of the comparison coil (9) and the detection coil (8), and is used to convert the resistance change rate of the comparison coil (9) and the detection coil (8) into The voltage output is then provided to the amplifier (14) for amplification and measurement;

   The input terminal of the amplifier (14) is connected to the output terminal of the electric bridge (13), and is used to further amplify the current signal;

   The input terminal of the detector (15) is connected to the output terminal of the amplifier (14) and is responsible for taking out the unidirectional envelope signal from the high-frequency amplitude-modulated wave;

   The input terminal of the filter (16) is connected to the output terminal of the detector (15), and is used to filter out high-frequency carrier components, make the low-frequency useful signal pure, and eliminate interference signals.
4. The online prediction system for the remaining life of an elevator traction wire rope according to claim 3, characterized in that the analysis and evaluation module (5) includes an amplitude discriminator (17), a display and recording device (18), and data evaluation and Life prediction device (19);

   The input terminal of the amplitude discriminator (17) is connected to the output terminal of the filter (16), which is responsible for further filtering noise to obtain the signal to be displayed and recorded;

   The input terminal of the display and recording device (18) is connected to the output terminal of the amplitude discriminator (17), and is used to display the processed signal and perform real-time recording;

   The input terminal of the data evaluation and life prediction device (19) is connected to the output terminal of the display and recording device (18), which is responsible for differentiating the collected detection signal from the elevator traction wire rope pre-stored in the database The wear level is compared with the life information to predict the life of the detected elevator rope.
5. The online prediction system for the remaining life of an elevator traction wire rope according to claim 1, characterized in that the middle of the insulating sleeve (7) is a semi-hollow fence structure.
6. The online prediction system for the remaining life of an elevator traction wire rope according to claim 1, characterized in that the wire rope fixing wheel (11) is provided on the inner wall near the entrance and exit inside the insulating sleeve (7).
7. An online prediction method for the remaining life of an elevator traction wire rope is characterized in that it includes the following steps:

   S1, the fixing bracket (2) of the detection device is fixed on the steel structure frame (1) of the elevator shaft by bolts (3), and the elevator traction wire rope (10) is passed through the inside of the insulating sleeve (7), and at the same time Contact with the wire rope fixed wheel (11) connected to the inner wall of the insulating sleeve (7) through a spring (12);

   S2. During detection, the oscillator (4) generates an alternating current and supplies it to the comparison coil (9) and the detection coil (8). The comparison coil (9) and the detection coil (8) generate an alternating electromagnetic field. The alternating electromagnetic field acts to pass through Compare the coil (9) and the detection coil (8) on the elevator traction wire rope (10) to be detected, so that the elevator traction wire rope (10) generates eddy current magnetic field feedback under the action of the electromagnetic field, and thus the detection coil (8) ) And the comparison coil (9) generate impedance, the bridge (13) converts the resistance change rate of the detection coil (8) and the comparison coil (9) into a voltage output;

   S3. Amplifier (14) is used to amplify the impedance change of the coil, and the detector (15) and filter (16) are used to eliminate the interference signal during the detection, and the required defect data is taken out;

   S4. Use the amplitude discriminator (17) to perform amplitude analysis on the data, and display the relevant data through the display and recording device (18);

   S5. Use the life data of the elevator traction wire rope (10) of different damage levels stored in the data evaluation and prediction device (19) to compare, so as to predict the working life of the detected elevator traction wire rope (10).

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