CN114235944B - Inhaul cable magnetic flux leakage nondestructive detection device and method based on light source signals - Google Patents
Inhaul cable magnetic flux leakage nondestructive detection device and method based on light source signals Download PDFInfo
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 124
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- 230000005284 excitation Effects 0.000 claims abstract description 31
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- 239000007788 liquid Substances 0.000 claims description 18
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
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Abstract
The invention relates to the field of bridge engineering and discloses a cable magnetic leakage nondestructive detection device based on a light source signal, which comprises an excitation device arranged on a cable to be detected, wherein the excitation device is U-shaped, a magneto-optical detection assembly sleeved on the cable to be detected is arranged in the U-shape of the excitation device through a connecting piece, and the excitation device and the magneto-optical detection assembly can synchronously move and rotate along the axial direction of the cable to be detected; the light magnetic detection assembly consists of a shell, a power panel, a magnetic conduction layer, a light source emitter, a light source receiver and side plates, wherein the shell is sleeved outside the magnetic conduction layer, the power panel and the light source emitter are sequentially arranged on the inner side of the shell, and the power panel and the light source receiver which are oppositely arranged with the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer. The invention can judge the defect only by the light source signal without collecting the magnetic leakage signal, thereby avoiding the loss in the process of signal conversion. The invention further provides a inhaul cable magnetic flux leakage nondestructive detection method based on the light source signals.
Description
Technical Field
The invention relates to the fields of bridge engineering, electronic technology and sensing technology, and provides a stay cable magnetic flux leakage nondestructive testing device and method based on light source signals.
Background
In the current use process of the in-service bridge, stress fatigue and environmental corrosion of the structure often occur, and then certain health problems are generated. The inhaul cable is an important stress component of the bridge of the cable structure system, and in order to ensure the safety, reliability and stability of the bridge structure in the operation period, the inhaul cable should be monitored and detected regularly. In recent years, the inhaul cable detection method in the industry is mainly visual detection, ultrasonic detection, magnetic particle detection, magnetostriction guided wave detection and magnetic leakage detection. The magnetic flux leakage detection method has low requirements on the surface cleanliness of the inhaul cable, the detection device does not need to be contacted, the manual operation is convenient, the cost is controllable, and the technology is slightly mature in the inhaul cable nondestructive detection method.
The magnetic leakage detection is to magnetize the inhaul cable by using a magnetic source, if the surface has defects such as cracks, pitting corrosion and the like, the magnetic permeability of a defect area is reduced, the magnetic resistance is increased, and part of the energy of a magnetization field leaks out of the area to form a detectable magnetic leakage signal. When the magnetic force lines in the inhaul cable meet defects to generate ferromagnetic discontinuities, the magnetic force lines are focused or distorted, and the distortion is diffused to the surface of the material, so that a detectable magnetic field signal can be formed. The magnetic leakage detection can realize quantitative inspection, the detection range is not limited by the thickness of a detected piece, and meanwhile, certain characteristic dimensions (such as size, length and the like) of defects can be known according to signal processing. However, the detection probes of the magnetic leakage detection method are all traditional Hall elements, and the working mechanism is that the collected magnetic leakage signals are output as electric signals, and the positions and the sizes of defects are judged through the amplitude values of the electric signals. The signal accuracy can be affected by the interference of a plurality of factors in the acquisition process, such as background magnetic field, noise caused by machine vibration, low signal-to-noise ratio of the traditional Hall element probe and the like. The magnetic leakage signals are weak, the acquisition is difficult, and the signals are required to be converted into electric signals to be compared with each other to obtain a conclusion, and the loss of the signals in the conversion process is large.
Therefore, how to reduce the interference factor in detection; avoiding a traditional detection device with low signal-to-noise ratio; searching a novel detection method of the magnetic leakage signal, namely collecting a certain signal which can be directly output and obtaining a conclusion, and avoiding the step of signal conversion; and has very important engineering significance and practical value for improving the detection sensitivity and precision.
Disclosure of Invention
In view of the above, the invention aims to provide a inhaul cable magnetic leakage nondestructive detection device and method based on a light source signal, which aims to solve the problems that the traditional Hall element sensor cannot avoid interference factors and has lower sensitivity and precision in the moving process.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a cable magnetic leakage nondestructive detection device based on a light source signal, which comprises an excitation device arranged on a cable to be detected, wherein the excitation device is of a U-shaped structure, a magneto-optical detection assembly sleeved on the cable to be detected is arranged in the U-shaped part of the excitation device through a connecting piece, and the excitation device and the magneto-optical detection assembly can synchronously move and rotate along the axial direction of the cable to be detected; the light magnetic detection assembly consists of a shell, a power panel, a magnetic conduction layer, a light source emitter, a light source receiver and side plates, wherein the shell is sleeved outside the magnetic conduction layer, the power panel and the light source emitter are sequentially arranged on the inner side of the shell, and the power panel and the light source receiver which are oppositely arranged with the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer.
Further, the excitation device comprises an armature, an upper N pole magnet, an upper S pole magnet, a lower S pole magnet, an electric coil and a magnetic conduction connecting block with rollers, wherein the upper N pole magnet, the lower S pole magnet and the upper S pole magnet are respectively arranged on two sides of the length direction of the armature, the upper N pole magnet, the lower S pole magnet and the upper S pole magnet are respectively arranged on the same side, the upper N pole magnet, the lower S pole magnet and the lower N pole magnet are respectively arranged at the deviating ends of the armature, the magnetic conduction connecting block with the rollers is acted on a cable to be detected, and the upper N pole magnet, the lower S pole magnet and the upper S pole magnet are respectively wound with electric coils.
Furthermore, a connecting piece is arranged on the armature, and the connecting piece is made of non-magnetic conductive materials; the magnetic conductive connecting block with the roller adopts permalloy with higher magnetic conductivity than air, and the corresponding end of the magnetic conductive connecting block with the roller facing the cable to be detected is provided with a concave cambered surface matched with the excircle of the cable to be detected.
Further, the sizes of the upper N pole magnet, the lower S pole magnet, the upper S pole magnet and the lower N pole magnet and the number of turns of the electric wire are determined by the number of steel strands in the cable to be detected, and the cable to be detected reaches a magnetic saturation state.
Further, the power panel adopts a flexible PCD electric plate, and a wireless communication module is arranged in the power panel.
Further, the shell and the side plates are both magnetic shielding and shading plates.
Further, the shell, the magnetic conduction layer and the side plates are of an open-loop two-petal structure, and detachable fasteners are arranged on the circumferential seals corresponding to the shell.
Further, the light source emitter and the light source receiver are both in lattice type distribution structures and are arranged with respect to the axial full length of the shell and the radial 1/4-1/2 arc length.
Further, the single-point light source receiver consists of a magnetic liquid film, a cavity, and a spectrometer probe, the magnetic liquid film faces the light source emitter, and the spectrometer probe is positioned in the cavity and under the magnetic liquid film and faces the magnetic conductive layer.
Further, the thickness of the magnetic liquid film is 18-22 micrometers, one or more of ferroferric oxide, ferric oxide, co or Ni are selected as magnetic particles, and water is used as base liquid.
The invention also discloses a guy cable magnetic flux leakage nondestructive detection method based on the light source signal, which is implemented by using the detection device and comprises the following steps:
1) The detection device is sleeved on a cable to be detected and then brought to a designated position by a cable climbing robot;
2) Starting a light source emitter, acquiring the wavelength N1 of a first group of counts peak value by a spectrometer probe, outputting the wavelength N1 to be recorded at a PC end, and obtaining the light transmittance T1 at the peak value;
3) Starting an excitation device, enabling a spectrometer probe to acquire the wavelength N2 of the peak value of the second group of counts again after the inhaul cable to be detected reaches a magnetic saturation state, outputting the wavelength N2 to a PC end for recording, and obtaining the light transmittance T2 at the peak value;
4) Comparing the two groups of wavelengths with the light transmittance, and finding out the position with larger difference in the lattice, namely the defect position of the detection area;
5) After the signal of the first rectangular area is collected, the excitation device is closed, the magnetic conduction connecting block with the roller is driven by the motor to perform circumferential rotation, and the power supply of the excitation device is turned on after the signal reaches the next detection area, so that the circumferential area of the section can be detected;
6) The above process is repeated until the detection is completed after the top end of the inhaul cable to be detected.
The beneficial effects of the invention are as follows: the inhaul cable magnetic flux leakage nondestructive detection device based on the light source signals greatly solves the problems that a traditional Hall element sensor cannot avoid interference factors and has low sensitivity and precision in the moving process; the traditional magnetic leakage detection is optimized in a collection mode that magnetic leakage signals need to be collected and then converted into electric signals, so that accuracy and sensitivity can be guaranteed simultaneously, the anti-interference factor capability is high, defects can be judged without collecting the magnetic leakage signals, loss in the process of signal conversion is avoided, and the method has good application prospect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a three-dimensional schematic diagram of the structure of a nondestructive testing device of the present invention;
FIG. 2 is a schematic front view of FIG. 1;
FIG. 3 is a schematic axial cross-sectional view of FIG. 1;
FIG. 4 is a three-dimensional view of a light source emitter having a lattice structure;
FIG. 5 is a three-dimensional view of a light source receiver having a lattice structure;
FIG. 6 is a detailed view of a lattice light source receiver;
FIG. 7 is an open-loop schematic;
FIG. 8 is a schematic diagram of the working principle of the excitation device;
FIG. 9 is a schematic diagram of the detection operation principle of defect-free;
FIG. 10 is a schematic diagram of the detection of defects;
reference numerals: the device comprises an excitation device 1, a connecting piece 2, a magneto-optical detection assembly 3 and a cable to be detected 4; the magnetic conduction device comprises an armature 1-1, upper N and lower S pole magnets 1-2, upper S and lower N pole magnets 1-3, an electric coil 1-4 and a magnetic conduction connecting block 1-5 with rollers; the light source comprises a shell 3-1, a power panel 3-2, a magnetic conduction layer 3-3, a light source emitter 3-4, a light source receiver 3-5, a circumferential seal 3-6, a fastener 3-7 and a side plate 3-8; 3-51 parts of magnetic liquid film, 3-52 parts of cavity and 3-53 parts of spectrometer probe.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1-8, the stay cable magnetic leakage nondestructive detection device based on the light source signal in the embodiment is composed of an excitation device 1, a connecting piece 2 and a magneto-optical detection assembly 3. The excitation device 1 is arranged on the cable 4 to be detected and is of a U-shaped structure, the inside of the U-shaped part of the excitation device 1 is sleeved with the magneto-optical detection assembly 3 on the cable 4 to be detected through the connecting piece 2, and the excitation device 1 and the magneto-optical detection assembly 3 can synchronously move and rotate along the axial direction of the cable 4 to be detected.
The excitation device 1 includes: the magnetic field sensor comprises an armature 1-1, an upper N-lower S-pole magnet 1-2, an upper S-lower N-pole magnet 1-3, an electric coil 1-4 and a magnetic conduction connecting block 1-5 with rollers, wherein the upper N-lower S-pole magnet 1-2 and the upper S-lower N-pole magnet 1-3 which are fixedly connected with the same side are respectively arranged on two sides of the length direction of the armature 1-1 on the basis of a U-shaped magnet, the upper N-lower S-pole magnet 1-2 and the upper S-lower N-pole magnet 1-3 are arranged at the deviating end of the armature 1-1 and act on the magnetic conduction connecting block 5 with rollers on a cable 4 to be detected, the upper N-lower S-pole magnet 1-2 and the upper S-lower N-pole magnet 1-3 are wound with electric coils, and the rollers can be attached to the surface of the cable 4 to be detected and driven by a motor to rotate circumferentially.
The optomagnetic detection assembly 3 includes: the light source comprises a shell 3-1, a power panel 3-2, a magnetic conduction layer 3-3, a light source emitter 3-4, a light source receiver 3-5, a circumferential seal 3-6, a fastener 3-7 and a side plate 3-8; the shell 3-1 is sleeved outside the magnetic conduction layer 3-3, the two are connected into a whole through side plates 3-8 on two sides in the axial direction, a power panel 3-2 and a light source emitter 3-4 are sequentially arranged on the inner side of the shell 3-1, and another power panel 3-2 and a light source receiver 3-5 which is arranged opposite to the light source emitter 3-4 arranged on the shell 3-1 are sequentially arranged on the outer side of the magnetic conduction layer 3-3. Namely, the light magnetic detection assembly 3 is divided into a first interface formed by the shell 3-1 and the power panel 3-2 from outside to inside, a second interface formed by the other power panel 3-2 and the magnetic conduction layer 3-3, an a×b light source emitter 3-4 is arranged in a rectangular area on the first interface, and a a×b light source receiver 3-5 is arranged in a corresponding projection rectangular area on the second interface so as to ensure radial one-to-one correspondence between a light emitting end and a light receiving end. Thus, the light source emitters 3-4 and the light source receivers 3-5 are both in a lattice type distribution structure and are arranged with respect to the housing 3-1 in an axial full length and in a radial direction of 1/4-1/2 arc length.
In the embodiment, the casing 3-1, the magnetic conductive layer 3-3 and the side plate 3-8 are of an open-loop two-flap structure, and the circumferential seals 3-6 of the casing 3-1, which correspond to each other, are provided with detachable fasteners 3-7. Namely, the circumferential end parts of the two interfaces are fixedly connected by the circumferential seal 3-6, and the axial end parts of the two interfaces are fixedly connected by the side plate 3-8; thus, the optomagnetic detection assembly can be arranged in an open loop and locked and unlocked by the detachable fastening piece 3-7, and is sleeved on the stay rope 4 to be detected. And the shell 3-1 and the side plates 3-8 are made of magnetic shielding and shading plates. The fasteners 3-7 employ bolt-and-nut members.
The armature 1-1 of the excitation device 1 in the embodiment is provided with the connecting piece 2, and the bottom surface of the connecting piece 2 is fixedly connected with the surface of the shell 3-1 of the optomagnetic detection assembly 3, so that the excitation device 1 and the optomagnetic detection assembly 3 always maintain an integral structure when rotating circumferentially and climbing ropes. And the connecting piece 2 is made of non-magnetic conductive material.
The sizes of the upper N pole magnet 1-2, the lower S pole magnet 1-3, the upper S pole magnet 1-4 and the lower N pole magnet 1-4 and the number of turns of the electric coil are determined according to the number of steel strands in the cable 4 to be detected, so that the cable 4 to be detected can reach a magnetic saturation state.
The single-dot light source receiver 3-5 of the dot matrix type in the embodiment consists of a magnetic liquid film 3-51, a cavity 3-52 and a spectrometer probe 3-53, wherein the magnetic liquid film 3-51 faces the light source emitter 3-4, and the spectrometer probe 3-53 is positioned in the cavity 3-52, below the magnetic liquid film 3-51 and faces the magnetic conductive layer 3-3. The thickness of the magnetic liquid film 3-51 is 20 microns, one or more of ferroferric oxide, ferric oxide, co or Ni are selected as magnetic particles, and water is used as base liquid.
The power panel 3-2 in the embodiment adopts a flexible PCD electric plate, is internally provided with a wireless communication module, is connected with an external PC end, and ensures signal transmission received by a spectrometer probe.
The magnetic conductive connecting block 1-5 with the roller in the embodiment adopts permalloy with higher magnetic conductivity than air, and the size of the permalloy changes along with the outer diameter of the inhaul cable 4 to be inspected.
The side plates 3-8 in this embodiment are provided with balls in the radial direction of the corresponding surface facing the cable to be inspected 4, so as to facilitate the sliding and rotation of the optomagnetic detection assembly on the cable to be inspected. And the ball is made of magnetic shielding and shading materials.
The following working principle of the invention will be explained in detail with reference to fig. 9 to 10:
the stay cable magnetic flux leakage nondestructive detection device based on the light source signals is pre-installed in the climbing robot, and when the stay cable to be detected is detected healthily, the bolt-nut fastener is removed, and the stay cable to be detected is sleeved at the end part of the stay cable to be detected and then locked in a closed loop. The outer surface of the optomagnetic detection component is shaded, and the interior of the optomagnetic detection component always keeps a dark state. After the power supply is started, the cable climbing robot drives the detection device to rise at a fixed value, and the rising distance of each section is the axial length of the annular detection device. When the cable climbing robot reaches a designated area, the lattice light source emitter starts to work, the size of each emitted light source signal is equal and constant, after the light source signals are collected by the radially corresponding lattice light source receivers, the spectrometer probe obtains the wavelength N1 where the peak value of the first group of counts is located, and the wavelength N1 is output to be recorded at the PC end to obtain the light transmittance T1 at the peak value. At the moment, the exciting device is electrified, and the magnetic force lines excited are formed into a magnetic force line closed loop by the armature, permalloy, upper N and lower S pole magnets, a cable to be detected, upper S and lower N pole magnets, permalloy and the armature, so that the cable to be detected is ensured to be in a magnetic saturation state. Because the surfaces of the electromagnet shell and the sealing cover are coated with magnetic shielding materials, magnetic force lines can be reflected by the magnetic shielding materials, and an excitation magnetic field can not generate magnetic force on the internal magnetic liquid film. When the magnetic force lines meet the defects of the rectangular area where the lattice light source is located, focusing or distortion occurs, the distortion is diffused to the surface of the material to form a leakage magnetic field, and the magnetic force lines are guided to radially diffuse and not to diffuse by the magnetic conduction layer close to the surface of the inhaul cable. At this time, the magnetic liquid film in the lattice light source receiver near the leakage magnetic field is acted by magnetic force to guide the magnetic particles which are originally arranged in a disordered way inside to be arranged regularly along the leakage magnetic field. At this time, the light source signals are collected by the radially corresponding lattice light receivers, the spectrometer obtains the wavelength N2 where the second group of counts peak values are located, and the wavelength N2 is output to be recorded at the PC end, so that the light transmittance T2 at the peak values is obtained. And comparing the two groups of light transmittance and the two groups of wavelength of each point in the array to obtain the position and the size of the defect in the rectangular area. After the first rectangular area signal is collected, the power supply of the exciting device is turned off, and the magnetic particles are recovered to be in disordered arrangement. At the moment, the magnetic conduction connecting block with the roller is driven by the motor to perform circumferential rotation, and after reaching the next detection area, the power supply of the excitation device is turned on, so that the first section of circumferential area can be detected. The above process is repeated until the stay cable health detection is completed after the stay cable top to be detected.
The acquisition of the light source signal in the magnetic leakage detection process is not interfered by a background magnetic field and machine vibration; a detection probe with low signal-to-noise ratio is not required to be used; the signal conversion is not needed to be carried out again by detecting the size of the leakage flux; the method has the advantages of high precision, high sensitivity and signal output.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1. The cable magnetic leakage nondestructive detection device based on the light source signal comprises an excitation device (1) arranged on a cable to be detected (4), and is characterized in that the excitation device is of a U-shaped structure, a magneto-optical detection assembly (3) sleeved on the cable to be detected is arranged in the U-shaped part of the excitation device through a connecting piece (2), and the excitation device and the magneto-optical detection assembly can synchronously move and rotate along the axial direction of the cable to be detected; the optomagnetic detection assembly consists of a shell (3-1), a power panel (3-2), a magnetic conduction layer (3-3), a light source emitter (3-4), a light source receiver (3-5) and side plates (3-8), wherein the shell is sleeved outside the magnetic conduction layer and is connected into a whole through the side plates at two axial sides, the power panel and the light source emitter are sequentially arranged on the inner side of the shell, and the power panel and the light source receiver which are oppositely arranged with the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer; the single-point light source receiver consists of a magnetic liquid film (3-51), a cavity (3-52) and a spectrometer probe (3-53), wherein the magnetic liquid film faces the light source emitter, and the spectrometer probe is positioned in the cavity, below the magnetic liquid film and faces the magnetic conductive layer.
2. The inhaul cable magnetic leakage nondestructive testing device based on the light source signals according to claim 1, wherein the excitation device is composed of an armature (1-1), an upper N-lower S-pole magnet (1-2), an upper S-lower N-pole magnet (1-3), an electric coil (1-4) and a magnetic conductive connecting block with rollers (1-5), the upper N-lower S-pole magnet and the upper S-lower N-pole magnet which are arranged on the same side are respectively arranged on two sides of the length direction of the armature, the upper N-lower S-pole magnet and the upper S-lower N-pole magnet are arranged at the deviating ends of the armature and act on the magnetic conductive connecting block with rollers of the inhaul cable to be tested, and the upper N-lower S-pole magnet and the upper S-lower N-pole magnet are wound with electric coils.
3. The stay cable magnetic flux leakage nondestructive testing device based on the light source signals according to claim 2, wherein a connecting piece is arranged on the armature, and the connecting piece is made of non-magnetic conductive materials; the magnetic conductive connecting block with the roller adopts permalloy with higher magnetic conductivity than air, and the corresponding end of the magnetic conductive connecting block with the roller facing the cable to be detected is provided with a concave cambered surface matched with the excircle of the cable to be detected.
4. The device for nondestructive testing of cable leakage based on light source signals according to claim 2, wherein the sizes of the upper N pole magnet, the lower S pole magnet, the upper S pole magnet and the lower N pole magnet and the number of turns of the electric wire are determined by the number of steel strands in the cable to be tested, and the cable to be tested is in a magnetic saturation state.
5. The device for nondestructive testing of cable leakage based on light source signals according to claim 1, wherein the power panel is a flexible PCD panel and is internally provided with a wireless communication module.
6. The device for nondestructive testing of cable leakage based on light source signals according to claim 1, wherein the housing and the side plates are both magnetic shielding and shading plates.
7. The inhaul cable magnetic flux leakage nondestructive testing device based on the light source signals according to claim 1, wherein the shell, the magnetic conduction layer and the side plates are of an open-loop type two-flap structure, and detachable fasteners (3-7) are arranged on circumferential seals (3-6) corresponding to the shell.
8. The inhaul cable magnetic flux leakage nondestructive testing device based on the light source signals according to claim 1, wherein the light source emitter and the light source receiver are of dot matrix distribution structures and are arranged in a radial direction of 1/4-1/2 arc length relative to the axial full length of the shell.
9. The device for nondestructive testing of cable magnetic leakage based on light source signals according to claim 1, wherein the thickness of the magnetic liquid film is 18-22 microns, one or more of ferroferric oxide, ferric oxide, co or Ni are selected as magnetic particles, and water is selected as base liquid.
10. A method for nondestructive testing of cable leakage based on light source signals, wherein the testing device of any one of claims 1-9 is used, the method comprising:
1) The detection device is sleeved on a cable to be detected and then brought to a designated position by a cable climbing robot;
2) Starting a light source emitter, acquiring the wavelength N1 of a first group of counts peak value by a spectrometer probe, outputting the wavelength N1 to be recorded at a PC end, and obtaining the light transmittance T1 at the peak value;
3) Starting an excitation device, enabling a spectrometer probe to acquire the wavelength N2 of the peak value of the second group of counts again after the inhaul cable to be detected reaches a magnetic saturation state, outputting the wavelength N2 to a PC end for recording, and obtaining the light transmittance T2 at the peak value;
4) Comparing the two groups of wavelengths with the light transmittance, and finding out the position with larger difference in the lattice, namely the defect position of the detection area;
5) After the signal of the first rectangular area is collected, the excitation device is closed, the magnetic conduction connecting block with the roller is driven by the motor to perform circumferential rotation, and the power supply of the excitation device is turned on after the signal reaches the next detection area, so that the circumferential area of the section can be detected;
6) The above process is repeated until the detection is completed after the top end of the inhaul cable to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111580870.7A CN114235944B (en) | 2021-12-22 | 2021-12-22 | Inhaul cable magnetic flux leakage nondestructive detection device and method based on light source signals |
Applications Claiming Priority (1)
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