A nondestructive testing system and method for steel wire rope wear based on photosensitive effect

Abstract

The application discloses a kind of based on photosensitive effect's steel wire rope wear nondestructive testing system and detection method, belong to nondestructive testing field.System includes laser light source module, it is used to project light;To be detected steel wire rope, it is vertically arranged in the light projection direction of laser light source module, to be detected steel wire rope can do vertical lifting movement;Photosensitive module, it is arranged in the light projection direction of laser light source module, received optical signal is converted into electrical signal;Signal pre-processing module, it is connected with photosensitive module signal, for receiving the electrical signal data that photosensitive module issues, and electrical signal data is handled, and the data transmission after processing;Online analysis monitoring module, it is connected with signal pre-processing module signal, receives the data transmission of signal pre-processing module, and realizes the evaluation of steel wire rope health state.The based on photosensitive effect's steel wire rope wear nondestructive testing system and detection method of the application, can realize real-time, reliable automatic nondestructive testing to steel wire rope.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nondestructive testing, and more particularly relates to a steel wire rope wear nondestructive testing system and method based on photosensitive effect. BACKGROUND

[0002] In today's society, all industries in the industrial field are pursuing high-quality development, therefore, the wear and tear problem of the parts of the mechanical and electrical equipment has been paid more and more attention, when the wear and tear of some parts exceeds the predetermined standard, it will seriously affect the working performance of the equipment, and even may cause great harm, for the mine hoist equipment, the steel wire rope, as a part, is often worn and torn, and it is particularly important to detect the steel wire rope periodically or in real time, however, under normal circumstances, the general enterprise adopts the traditional manual visual inspection method to detect the wear and tear, which has the problems of low detection efficiency, insufficient detection, and unreliable detection results, therefore, it is necessary to propose an efficient, convenient, reliable and automatic nondestructive testing method.

[0003] At present, nondestructive testing technology is diversifying and developing rapidly, and the representative detection methods include electromagnetic detection method, eddy current detection method, acoustic detection method, ray detection method, optical detection method, mechanical detection method and magnetostrictive detection method, etc. The methods commonly used for steel wire rope wear are electromagnetic detection method and optical detection method.

[0004] According to the search, the Chinese patent publication No. CN 111855748 A, published on October 30, 2020, discloses a steel wire rope damage detection device and method based on electromagnetic mutual inductance, the device adopts a direct current power supply excitation coil, an alternating current power supply excitation coil and a detection signal coil which are superimposed and wound on a non-magnetic plastic tube, the steel wire rope to be detected moves in the non-magnetic plastic tube for damage detection; the excitation source adopts a dual power excitation mode of direct current power supply plus alternating current excitation power supply, which can improve the detection sensitivity of the steel wire rope damage; the direct current power supply excitation coil, the alternating current power supply excitation coil and the detection signal coil are independent of each other; the application can realize the detection of the wear and tear of the steel wire rope, but the electromagnetic detection method has problems of real-time, stability, good environmental adaptability, etc. which are difficult to solve.

[0005] The optical detection method has made great progress in recent years, mainly because the image processing technology based on machine vision has been applied to nondestructive testing, thereby greatly promoting the real-time performance of nondestructive testing, and under stable environmental conditions, the detection based on machine vision has high reliability and accuracy.

[0006] For example, Chinese Patent Publication No. CN 109859170 A; Application Publication Date: June 7, 2019; discloses a steel wire rope surface damage intelligent monitoring method and system based on LBP feature. First, an image dataset of healthy, broken wire, and worn steel wire rope surface is established. The filter, LBP operator parameters, PCA dimension reduction dimension, machine learning algorithm and its parameters are determined to obtain an integrated algorithm model. The system includes: an offline training and testing module for obtaining a trained integrated algorithm model; a field image acquisition module for real-time acquisition of field images and acquisition of image position information; and an online monitoring module for carrying the integrated algorithm model to perform real-time processing on the collected field images, thereby making real-time diagnosis of the steel wire rope surface state. Although the machine vision-based steel wire rope nondestructive testing method has achieved good results, the detection effect cannot meet the requirements in the quantitative analysis of the lack of light imaging, small surface wear target, and steel wire rope wear condition, and even cannot complete the task.

[0007] There have been many studies on optical detection methods based on photosensitive effect in the field of surface defects, but there are few studies on steel wire rope wear detection. Moreover, the quantitative analysis method of these detection methods is not clear, is easily disturbed by environmental light, and has low reliability. Therefore, there is an urgent need for a way to effectively solve these problems and realize real-time and reliable automatic detection of steel wire ropes SUMMARY

[0008] To solve at least one of the above technical problems, according to an aspect of the present application, a steel wire rope wear nondestructive detection system based on photosensitive effect is provided, comprising:

[0009] A laser light source module for projecting light;

[0010] A steel wire rope to be inspected is arranged vertically in the light projection direction of the laser light source module, and the steel wire rope to be inspected can make vertical lifting motion under the action of external force;

[0011] A photosensitive module is arranged in the light projection direction of the laser light source module, and the laser light source module and the photosensitive module are symmetrically arranged on both sides of the steel wire rope to be inspected. The photosensitive module is provided with a light transmission window at one end facing the laser light source module. The line connecting the light source of the laser light source module and the center of the light transmission window intersects with the axis of the steel wire rope to be inspected. The photosensitive module converts the received optical signal into an electrical signal;

[0012] A signal preprocessing module is connected with the photosensitive module for receiving the electrical signal data emitted by the photosensitive module and processing the electrical signal data. The processed data is transmitted;

[0013] An online analysis monitoring module is in signal connection with the signal preprocessing module, receives and stores the data transmitted by the signal preprocessing module, and calculates the radial size d of the steel wire rope to be detected at the time t in real time according to the data t and the radial wear amount Δd t and generates a work log according to the time sequence, records the wear time Δt and the corresponding wear length x, and realizes the evaluation of the health state of the steel wire rope.

[0014] According to the steel wire rope wear nondestructive detection system based on the photosensitive effect, optionally, the laser light source module can project transverse light and longitudinal light.

[0015] According to the steel wire rope wear nondestructive detection system based on the photosensitive effect, optionally, the light transmission window of the photosensitive module is covered with a light transmission glass cover plate, and the light transmission glass cover plate only allows light with a wavelength equal to the wavelength of the light projected by the laser light source module to pass through.

[0016] According to the steel wire rope wear nondestructive detection system based on the photosensitive effect, optionally, the photosensitive module further comprises:

[0017] The photosensitive resistor is arranged opposite to the light transmission window;

[0018] The independent power supply is in communication with the photosensitive resistor through a working circuit;

[0019] The output circuit is in communication with the photosensitive resistor at one end and in communication with the signal preprocessing module at the other end;

[0020] The photosensitive explosion-proof shell encapsulates the photosensitive resistor, the independent power supply and the working circuit, and the light transmission window is arranged at one end of the photosensitive explosion-proof shell close to the laser light source module.

[0021] According to the steel wire rope wear nondestructive detection system based on the photosensitive effect, optionally, the photosensitive resistor is in a strip shape, and the length L1 of the long side is 2 to 3 times the normal cross-sectional diameter d0 of the steel wire rope to be detected.

[0022] The working circuit is a constant voltage bias circuit, and the working voltage is a constant voltage.

[0023] According to the steel wire rope wear nondestructive detection system based on the photosensitive effect, optionally, the signal preprocessing module comprises:

[0024] The electric signal data acquisition unit is connected with the output circuit of the photosensitive module, acquires the electric signal data transmitted by the photosensitive module in time sequence, and transmits;

[0025] The signal amplification unit is connected with the electric signal data acquisition unit, is used for amplifying the electric signal collected by the electric signal data acquisition unit, and transmits;

[0026] a filter processing unit connected with the signal amplification unit, for filtering out the low-frequency noise part in the electrical signal transmitted by the signal amplification unit, retaining the high-frequency effective part, and transmitting the filtered electrical signal;

[0027] an analog-to-digital conversion unit connected with the filter processing unit, receiving the filtered electrical signal and converting it into a digital signal and transmitting;

[0028] a wireless data communication sending unit connected with the analog-to-digital conversion unit, receiving the digital signal and transmitting wirelessly to the online analysis and detection module;

[0029] a pre-treatment explosion-proof housing encapsulating each unit of the signal pre-processing module.

[0030] According to another aspect of the present application, a non-destructive testing method for steel wire rope wear based on photosensitive effect is provided, comprising the following steps:

[0031] I. Constructing a steel wire rope radial wear amount Δd calculation model:

[0032]

[0033]

[0034] wherein, K L is the proportionality coefficient of photosensitive resistance light flux and photosensitive current, E is the illumination of photosensitive resistance, B is the width of projected light, ΔI P is the change amount of photosensitive resistance current caused by light, I is the light intensity of the laser light source of the laser light source module, θ is the light plane angle of the laser light source in the direction, L0 is the length of the transverse light projected by the laser light source module;

[0035] II. Measuring the current I P0 of the photosensitive module under the condition of no wear of the steel wire rope;

[0036] III. Constructing a steel wire rope diameter d t calculation model at time t:

[0037]

[0038] constructing a radial wear amount Δd t calculation model at time t:

[0039]

[0040] wherein, d0 is the diameter of the steel wire rope under the condition of no wear, ΔI Pt is the change amount of photosensitive resistance current at time t;

[0041] Four, build the steel wire rope wear length x calculation model to be detected:

[0042] x=v·Δt

[0043] Δt=t i+1 -t i ;

[0044] Wherein, v is the motion speed of the steel wire rope to be detected, Δt is the wear time, t i is the time when the diameter d t ≤0.98d0 in the detection process;

[0045] Five, start the detection system, make the steel wire rope to be detected move up / down at the speed of v, record the radial size d t of the steel wire rope to be detected at t time and the radial wear amount Δd t , and generate a work log according to the time sequence, record the wear time Δt and the corresponding wear length x.

[0046] According to the steel wire rope wear nondestructive detection method based on the photosensitive effect of the embodiment of the application, optionally, further comprising:

[0047] Six, multiple times of obtaining the wear condition of the same position of the steel wire rope to be detected, and calculating the average value.

[0048] According to the steel wire rope wear nondestructive detection method based on the photosensitive effect of the embodiment of the application, optionally, the step six specifically comprises:

[0049] Obtain the radial wear amount of the steel wire rope detected by the first to Nth light rays from top to bottom at t time, and respectively record them as

[0050] The average wear amount is:

[0051]

[0052]

[0053] Wherein, t0 is the time interval of the adjacent light rays detecting the same position, and S is the distance between the adjacent light rays.

[0054] According to the steel wire rope wear nondestructive detection method based on the photosensitive effect of the embodiment of the application, optionally, further comprising:

[0055] Seven, generate a work log about according to the time sequence, record the wear time Δt and the corresponding wear length x, and realize the evaluation of the health state of the steel wire rope to be detected.

[0056] Beneficial effects

[0057] Compared with the prior art, the application has at least the following beneficial effects:

[0058] (1) Compared with the traditional light-sensitive principle detection method, the steel wire rope wear non-destructive detection system and detection method based on the light-sensitive effect of the application can detect the radial wear amount of multiple sections of the steel wire rope at one time by projecting multiple line light sources, the line light source has a narrow irradiation width, the resolution of the wear detection is higher, the line light source has more controllable and uniform illumination compared with the uneven illumination of the area light source, thereby realizing multiple detection of the moving steel wire rope section by section, and improving the detection accuracy of the same position;

[0059] (2) Compared with the traditional machine vision principle detection method, the steel wire rope wear non-destructive detection system and detection method based on the light-sensitive effect of the application does not need to be trained in advance, is not easily disturbed by the ambient light, and is not limited by the running speed of the steel wire rope hoist, and has a fast detection speed;

[0060] (3) Compared with the traditional optical detection method, the steel wire rope wear non-destructive detection system and detection method based on the light-sensitive effect of the application is an end-to-end non-destructive detection method, the on-line analysis and monitoring module can obtain the radial wear length of the steel wire rope in real time, capture the dangerous section of the steel wire rope, evaluate the health state of the steel wire rope, and intuitively display the detection situation through the equipment, which is more convenient;

[0061] (4) Compared with the traditional electromagnetic detection method, the steel wire rope wear non-destructive detection system and detection method based on the light-sensitive effect of the application adopts photoelectric principle detection, has a convenient structure and system arrangement, is not disturbed by the electromagnetic field, and can stably detect the wear under the complex working conditions of the steel wire rope. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the application, and are not a limitation on the application.

[0063] Figure 1 A schematic diagram of the steel wire rope wear non-destructive detection system based on the light-sensitive effect of the application is shown;

[0064] Figure 2 A schematic diagram of the internal structure of the steel wire rope wear non-destructive detection system based on the light-sensitive effect of the application is shown;

[0065] Figure 3 A schematic diagram of the internal structure of the signal preprocessing module of the application is shown;

[0066] Figure 4 A flowchart of the detection method of the application is shown;

[0067] Reference signs:

[0068] 1, laser light source module; 2, steel wire rope to be detected; 3, photosensitive module; 4, photosensitive resistor; 5, photosensitive explosion-proof shell; 6, photosensitive module working circuit board; 7, electric signal data acquisition unit; 8, signal amplification unit; 9, wireless data communication sending unit; 10, analog-to-digital conversion unit; 11, filtering processing unit; 12, signal preprocessing module working circuit board; 13, pre-processing explosion-proof shell; 14, detection wear projection light segment; 15, independent power supply; 16, upper computer; 17, wireless data communication receiving unit. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0070] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings understood by those skilled in the art to which the present application belongs.

[0071] Embodiment 1

[0072] The steel wire rope wear non-destructive detection system based on photosensitive effect of the present embodiment, as shown in Figure 1 and Figure 2 , includes a laser light source module 1, a steel wire rope to be detected 2, a photosensitive module 3, a signal preprocessing module and an online analysis monitoring module.

[0073] Among them, the laser light source module 1 is used to project light, and the laser light source module 1 of the present embodiment specifically includes a laser light source generator, a power supply, a working circuit, an explosion-proof shell and a support frame. The laser light source generator is connected to the working circuit under the power supply, and the laser light source generator, the power supply and the working circuit are jointly packaged inside the explosion-proof shell. Further, the laser light source generator includes a light-emitting semiconductor and a light ray diffraction lens. The light ray can be projected through the light ray diffraction lens to N channels of transverse light rays with a spacing S, and to longitudinal light rays, wherein S should be less than the pitch of the steel wire rope to be detected 2; the explosion-proof shell is in the shape of a cuboid, a through hole is formed on the upper bottom surface thereof, the light ray diffraction lens of the laser light source generator is embedded into the through hole, the support frame includes a gimbal and a bottom support, the gimbal can rotate in multiple degrees of freedom, the gimbal is connected to the explosion-proof shell, and the bottom support can be telescoped up and down to provide a certain working height for the laser light source generator.

[0074] The steel wire rope to be detected 2 is a steel wire rope that needs to be detected for wear, which is vertically arranged in the light projection direction of the laser light source module 1 in the present embodiment, and can move vertically at a certain speed under the action of external force.

[0075] In this embodiment, the photosensitive module 3 is arranged along the light projection direction of the laser source module 1. The laser source module 1 and the photosensitive module are symmetrically arranged on both sides of the steel wire rope 2 to be inspected. A light-transmitting window is provided on the end of the photosensitive module facing the laser source module 1. The line connecting the light source of the laser source module 1 and the center of the light-transmitting window intersects the axis of the steel wire rope 2 to be inspected. The photosensitive module 3 converts the received light signal into an electrical signal. More specifically, the photosensitive module 3 in this embodiment includes a photoresistor 4, an independent power supply 15, an output circuit, and a photosensitive explosion-proof housing 5, such as... Figure 2 As shown, the photoresistor 4 is positioned directly opposite the light-transmitting window. The independent power supply 15 is connected to the photoresistor 4 through a working circuit. One end of the output circuit is connected to the photoresistor 4, and the other end is connected to the signal preprocessing module. The photosensitive explosion-proof housing 5 is rectangular and encapsulates the photoresistor 4, the independent power supply 15, and the working circuit. The light-transmitting window is located at the end of the photosensitive explosion-proof housing 5 near the laser source module 1. The photoresistor 4 is positioned at the corresponding position of the light-transmitting window, and the light contact surface of the photoresistor 4 corresponds to the light-transmitting window. The photoresistor 4, the independent power supply 15, and the working circuit are all mounted on a photosensitive module working circuit board 6.

[0076] Furthermore, in this embodiment, a light-transmitting glass cover is placed on the outside of the light-transmitting window of the photosensitive module 3. In this embodiment, it is a red explosion-proof light-transmitting glass panel. The light-transmitting glass cover only allows light with a wavelength of the wavelength of the light projected by the laser light source module to pass through. In this embodiment, the laser light source module 1 emits a wavelength of λ0, and the red explosion-proof light-transmitting glass panel also only allows light with a wavelength of λ0 to pass through, thereby reducing the incidence of other colors of light in the environment, and thus reducing the influence of non-λ0 wavelength light on the photoresistor.

[0077] Furthermore, in this embodiment, the photoresistor 4 is elongated, and its long side length L1 is 2 to 3 times the normal cross-sectional diameter d0 of the steel wire rope to be tested. Since the steel wire rope 2 to be tested is moving during the testing process, it may sway. Therefore, the horizontal length of the photoresistor 4 must be able to cover the projected area of ​​the steel wire rope 2 to be tested. Hence, this setting is made in this embodiment.

[0078] Furthermore, in this embodiment, there are N photoresistors 4, corresponding to the N transverse rays projected by the laser light source module 1. The spacing between adjacent photoresistors 4 is also S. Each photoresistor 4 corresponds to one transverse ray, and each resistor corresponds to a working circuit and an independent power supply 15. The working circuit in this embodiment is a constant voltage bias circuit, and the working voltage is a constant voltage U0. Therefore, changes in the incident light flux will only cause changes in the current I in the circuit. P The wear of the wire rope can be detected by using a component calculation model based on the changes in current.

[0079] The signal preprocessing module in this embodiment is as follows:Figure 2 and Figure 3 As shown in the figure, it comprises an electric signal data acquisition unit 7, a signal amplification unit 8, a filtering processing unit 11, an analog-digital conversion unit 10, a wireless data communication sending unit 9 and a pre-processing explosion-proof shell 13. The electric signal data acquisition unit 7 is connected with the output circuit of the photosensitive module 3, acquires the electric signal data transmitted by the photosensitive module 3 in time sequence and transmits it. The signal amplification unit 8 is connected with the electric signal data acquisition unit 7, amplifies the electric signal acquired by the electric signal data acquisition unit 7 and transmits it. The filtering processing unit 11 is connected with the signal amplification unit 8, filters out the low-frequency noise part in the electric signal transmitted by the signal amplification unit 8, retains the high-frequency effective part and transmits the filtered electric signal. The analog-digital conversion unit 10 is connected with the filtering processing unit 11, receives the filtered electric signal and converts it into a digital signal and transmits it. The wireless data communication sending unit 9 is connected with the analog-digital conversion unit 10, receives the digital signal and transmits it wirelessly to the online analysis and detection module. The electric signal data acquisition unit 7, the signal amplification unit 8, the filtering processing unit 11, the analog-digital conversion unit 10 and the wireless data communication sending unit 9 are integrated on the signal pre-processing module working circuit board 12, and the pre-processing explosion-proof shell 13 encapsulates each unit of the signal pre-processing module.

[0080] Further, in the light signal acquisition stage of the photosensitive module 3, once noise reduction is performed through the light-transmitting glass panel, the light of non-λ0 wavelength is filtered out, and in the signal pre-processing module, noise reduction is performed again through the filtering unit, the low-frequency invalid component in the signal is filtered out, the invalid signal generated by the light of non-λ0 wavelength is further weakened, the high-frequency effective signal generated by the projected light of λ0 wavelength is retained, so that the final detection result is more objective and reliable.

[0081] The online analysis and monitoring module of the embodiment is connected with the signal pre-processing module, receives and stores the data transmitted by the signal pre-processing module, comprises an upper computer 16 and a wireless data communication receiving unit 17, the wireless data communication receiving unit 17 receives the signal data sent by the signal pre-processing module, and the upper computer 16 analyzes and demodulates the signal, calculates the radial size d t and the radial wear amount Δd t of the steel wire rope 2 at t time according to the data in real time, generates a work log in time sequence, records the wear time Δt and the corresponding wear length x, realizes the evaluation of the health state of the steel wire rope and presents the final result to the user through an interactive interface such as a display.

[0082] The laser light source module 1 and the photosensitive module 3 are symmetrically arranged on the two sides of the same horizontal plane of the steel wire rope 2 to be detected, the transverse light projected by the laser light source module 1 is perpendicular to the transparent glass panel of the photosensitive module 3 and the steel wire rope 2 to be detected, the longitudinal light projected by the laser light source module 1 coincides with the axis of the steel wire rope 2 to be detected, the horizontal distance between the laser light source module 1 and the photosensitive module 3 is a constant value r, in the embodiment, the laser light source module 1 is arranged on the left side of the steel wire rope 2 to be detected, the photosensitive module 3 is arranged on the right side of the steel wire rope 2 to be detected, and the distance between the laser light source module 1 and the photosensitive module 3 is 50cm, as shown in the arrangement shown in Figure 1 The multiple transverse light projected by the laser light source module 1 is perpendicular to the transparent glass panel of the photosensitive module 3 and the steel wire rope 2 to be detected, the distance between the adjacent light is S, S is less than the pitch of the steel wire rope 2 to be detected, and the value of S ensures the sensitivity of the detection system, and the multiple transverse light is used for simultaneously detecting the radial wear of the multiple cross sections with a distance of S.

[0083] Embodiment 2

[0084] The photosensitive effect-based steel wire rope wear nondestructive detection method of the embodiment is based on the detection system of embodiment 1, as shown in Figure 4 , and specifically includes the following steps:

[0085] I. Construct a steel wire rope radial wear amount Δd calculation model:

[0086]

[0087]

[0088] Wherein, K L is the proportion coefficient of the photosensitive resistance 4 light flux and the photosensitive current, E is the illumination of the photosensitive resistance 4, B is the width of the projected light, ΔI P is the photosensitive resistance current change amount caused by light, I is the light intensity of the laser light source of the laser light source module 1, θ is the light plane angle of the laser light source in the direction, and L0 is the length of the transverse light projected by the laser light source module 1.

[0089] II. Measure the current I P0 of the photosensitive module 3 under the condition of no wear of the steel wire rope.

[0090] III. Construct a steel wire rope diameter d t calculation model at time t:

[0091]

[0092] Construct a radial wear amount Δd t calculation model at time t:

[0093]

[0094] Wherein, d0 is the diameter of the steel wire rope without wear, and Δd is the radial wear of the steel wire rope. Pt is the change of the photoresistor current at time t;

[0095] Four, the construction of the steel wire rope 2 wear length x calculation model:

[0096] x = v · Δt;

[0097] Δt = t i+1 -t i ;

[0098] Wherein, v is the speed of the steel wire rope 2, Δt is the wear time, t i is the time when the diameter d t ≤0.98d0 in the detection process;

[0099] Five, start the detection system, make the steel wire rope 2 to move at the speed of v, record the radial size d t of the steel wire rope 2 at time t and the radial wear amount Δd t , and generate a work log according to the time sequence, record the wear time Δt and the corresponding wear length x;

[0100] Six, multiple acquisition of the wear condition of the steel wire rope 2 at the same position, and calculate the average value;

[0101] Get the radial wear of the steel wire rope detected by the first to N light from top to bottom at time t, respectively recorded as

[0102] The average wear amount is:

[0103]

[0104]

[0105] Wherein, t0 is the time interval of adjacent light detection at the same position, and S is the distance between adjacent lights.

[0106] Seven, generate a work log about according to the time sequence, record the wear time Δt and the corresponding wear length x, and realize the evaluation of the health status of the steel wire rope 2.

[0107] Further, in step one, the specific construction method of the steel wire rope radial wear amount Δd calculation model is as follows:

[0108] S10, construct the light flux optimization calculation model:

[0109]

[0110] Wherein, I is the light intensity of the laser light source generator in the laser light source module; θ is the light plane angle of the laser light source in the direction, which is the simplification of the light-emitting solid angle Ω of the linear light source; θ is the product factor of the luminous flux for calculating the corresponding light length;

[0111] When the steel wire rope is not worn,

[0112] The luminous flux on the photoresistor

[0113] When the steel wire rope is worn radially by Δd,

[0114] The luminous flux on the photoresistor

[0115] The luminous flux change amount

[0116] In the formula, Δd is the radial wear amount of the steel wire rope, d0 is the radial diameter size of the steel wire rope, L1 is the light length sensed by the photoresistor 4, and L0 is the length of the transverse light projected by the laser light source module 1;

[0117] S11, build the illumination relationship of the photoresistor 4:

[0118] The illumination formula

[0119] Since the light intensity of the laser light source module is stable, and the light receiving surface of the photoresistor is a plane, therefore

[0120] Therefore, the illumination

[0121] In the formula, B is the width of the projected light;

[0122] It can be seen that I, θ, L0 and B are all unchanging hardware parameters of the laser light source module 1, so the illumination of the photoresistor 4 is a constant value;

[0123] According to the light illumination characteristics of the photoresistor 4, and combining the volt-ampere characteristics, the luminous flux of the photoresistor is analyzed. Since the illumination E of the photoresistor 4 is a constant value, the luminous flux sensed by the photoresistor is

[0124] The luminous flux Is only proportional to the light length sensed by the photoresistor 4;

[0125] S12, build the Δd calculation model:

[0126] When the photoresistor is in the case of voltage U0 and incident light λ0, within a certain light intensity range, the luminous flux is proportional to the photosensitive current I P , that is

[0127] In the formula, K L is a proportional coefficient;

[0128] According to the light flux sensed by the photosensitive resistance The radial wear amount Δd of the steel wire rope is analyzed,

[0129]

[0130]

[0131] Then

[0132] In step four, t i The diameter d t ≤0.98d0 for a time, ±0.02d0 is the error allowable range, t i is automatically identified and recorded in real time by the system.

[0133] The nondestructive testing method for the radial wear of the steel wire rope based on the photosensitive effect in the embodiment can detect the radial wear amount of multiple sections of the steel wire rope at the same time by projecting multiple line light sources, the width of the line light source is narrow, the resolution of the wear detection is higher, compared with the uneven illumination of the traditional area light source, the illumination of the line light source is more controllable and more uniform, so that the motion steel wire rope is detected multiple times section by section, the detection precision of the same position is improved; further, the method does not need time training in the early stage, is not easily disturbed by the ambient light, and is not limited by the running speed of the steel wire rope hoist, and the detection speed is fast.

[0134] The examples described in the present application only describe the preferred embodiments of the present application, and do not limit the concept and scope of the present application, and various deformations and improvements of the technical solutions of the present application made by the engineering and technical personnel in the field without departing from the design idea of the present application shall fall within the protection scope of the present application.

Claims

1. A non-destructive testing system for wire rope wear based on photosensitive effect, characterized in that, include: Laser source module (1), which is used to project N channels with a spacing of Horizontal light rays, among which <Pitch of the steel wire rope to be inspected; The steel wire rope (2) to be inspected is vertically arranged in the direction of light projection from the laser light source module (1). The steel wire rope (2) to be inspected can move vertically up and down under the action of external force. The speed of movement of the steel wire rope (2) to be inspected is ; A photosensitive module (3) is arranged in the light projection direction of the laser source module (1). The laser source module (1) and the photosensitive module are symmetrically arranged on both sides of the steel wire rope (2) to be inspected. The end of the photosensitive module facing the laser source module (1) is provided with a light-transmitting window. The outside of the light-transmitting window is covered with a layer that only allows the wavelength of the laser source to pass through. Through the transparent glass cover, the line connecting the laser light source module (1) and the center of the transparent window intersects with the axis of the steel wire rope (2) to be inspected; the photosensitive module (3) includes a long side length The long strip photoresistor (4). This is the normal cross-sectional diameter of the wire rope, used to convert the received optical signal into an electrical signal; The signal preprocessing module is connected to the photosensitive module (3) and is used to receive the electrical signal data emitted by the photosensitive module (3) and process the electrical signal data by amplification and filtering. Low-frequency noise caused by wavelength, analog-to-digital conversion, and transmission of processed data; The online analysis and monitoring module is connected to the signal preprocessing module, receives and stores the data transmitted by the signal preprocessing module, and calculates the results in real time based on the data. The radial dimension of the steel wire rope (2) under inspection at any given time and radial wear The wear condition of the steel wire rope under inspection (2) at the same location was obtained multiple times to calculate the average value, and a work log was generated according to the time series to record the wear time. and corresponding wear length Record the length of wear. , The wear time is used to assess the health status of the wire rope. Among them, the wear condition of the same position of the steel wire rope (2) under inspection was obtained multiple times and the average value was calculated, specifically including: Obtain the radial wear of the wire rope detected by the first to Nth rays from top to bottom at time t, and record them as follows: , … ; Average wear for: in, The time interval for adjacent light rays to detect the same position. This represents the distance between adjacent light rays.

2. The non-destructive testing system for wire rope wear based on photosensitive effect according to claim 1, characterized in that, The photosensitive module (3) also includes: A photoresistor (4) is positioned directly opposite the light-transmitting window; an independent power supply (15) is connected to the photoresistor (4) via a working circuit; an output circuit is connected at one end to the photoresistor (4) and at the other end to the signal preprocessing module; a photosensitive explosion-proof housing (5) encapsulates the photoresistor (4), the independent power supply (15), and the working circuit, with the light-transmitting window located at the end of the photosensitive explosion-proof housing (5) near the laser source module (1).

3. The non-destructive testing system for wire rope wear based on photosensitive effect according to claim 2, characterized in that: The working circuit is a constant voltage bias circuit, and the working voltage is constant.

4. The non-destructive testing system for wire rope wear based on photosensitive effect according to claim 3, characterized in that, The signal preprocessing module includes: an electrical signal data acquisition unit (7), which is connected to the output circuit of the photosensitive module (3), acquires electrical signal data transmitted by the photosensitive module (3) in a time sequence, and transmits it; a signal amplification unit (8), which is connected to the electrical signal data acquisition unit (7), amplifies the electrical signal acquired by the electrical signal data acquisition unit (7), and transmits it; a filtering unit (11), which is connected to the signal amplification unit (8), filters out the low-frequency noise part in the electrical signal transmitted by the signal amplification unit (8), retains the high-frequency effective part, and transmits the filtered electrical signal; an analog-to-digital conversion unit (10), which is connected to the filtering unit (11), receives the filtered electrical signal, converts it into a digital signal, and transmits it; and a wireless data communication transmission unit (9), which is connected to the analog-to-digital conversion unit (10), receives the digital signal and wirelessly transmits it to the online analysis and monitoring module. The pre-processed explosion-proof housing (13) encapsulates the various units of the signal pre-processing module.

5. A non-destructive testing method for wire rope wear based on photosensitive effect, based on the testing system described in any one of claims 1 to 4, characterized in that, Includes the following steps: I. Constructing the radial wear of the wire rope Computational model: ; in, The ratio of luminous flux to photocurrent of the photoresistor (4) is given. The illuminance of the photoresistor (4) is... The width of the projected light beam. This represents the change in photoresistor current caused by light exposure. The laser light intensity of the laser light source module (1) is... The angle of the laser light source's emission plane in this direction. The length of the transverse light beam projected by the laser light source module (1); II. Measuring the current of the photosensitive module (3) of the steel wire rope under no-wear conditions. ; III. Construction The diameter of the steel wire rope to be inspected at any time (2) Computational model: ; Build Radial wear at time Computational model: in, The diameter of the wire rope under no-wear conditions. for The change in the photoresistor current at any given time; IV. Constructing the wear length of the steel wire rope to be inspected (2) Computational model: ; in, The speed of the steel wire rope (2) to be measured is... For wear time, For the first Diameter during the second detection process Time; 5. Start the detection system so that the steel wire rope (2) to be inspected is... Perform upward / downward movements at a certain speed and record the speed. The radial dimension of the steel wire rope (2) under inspection at any given time and radial wear It also generates a work log based on time series, recording wear and tear time. and corresponding wear length .

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