CN106290553B - Novel electromagnetic sensor system for detecting defects of steel wire rope - Google Patents
Novel electromagnetic sensor system for detecting defects of steel wire rope Download PDFInfo
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- 230000007547 defect Effects 0.000 title claims abstract description 87
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000001514 detection method Methods 0.000 claims abstract description 101
- 238000012545 processing Methods 0.000 claims abstract description 40
- 230000006698 induction Effects 0.000 claims description 62
- 230000003321 amplification Effects 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 16
- 230000008859 change Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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Abstract
The invention particularly discloses a novel electromagnetic sensor system for detecting defects of a steel wire rope, which comprises a sensor shell, permanent magnets, a detection circuit board and a detection circuit board support, wherein the sensor shell adopts a split structure, a through hole is formed in the bottom of the sensor shell, a detection circuit board support mounting groove is formed in the sensor shell, the detection circuit board adopts a semicircular structure which is symmetrical up and down, the permanent magnets are coaxially and concentrically arranged and embedded at two ends of the sensor shell, and threaded holes are formed in the upper edge of the detection circuit board support. The beneficial effects of the invention are as follows: the electromagnetic sensing technology is applied to the defect detection of the steel wire rope, so that the real-time processing and automatic nondestructive detection of the defect of the steel wire rope are realized, and various defect conditions can be measured at the same time.
Description
Technical Field
The invention relates to a detection device, in particular to an electromagnetic sensor system for detecting internal and external defects of a steel wire rope, which can especially realize the measurement of various defects of a sensor.
Background
The defects of the steel wire rope are generally classified into two main categories in the world: a metal sectional area Loss (LMA) type defect and a Local Flash (LF) type defect. LF type defects reflect damage conditions such as broken wires on a part of the steel wire rope, and LMA type defects reflect damage conditions such as long-distance abrasion and corrosion on the steel wire rope. However, most of the current domestic instruments for detecting the steel wire ropes only can detect one defect type, and the detection precision is not high. Some instruments can not process detection signals in place, and interference signals are easy to appear so as to influence misjudgment of defects; the traditional manual visual inspection method is easily influenced by personal subjective factors, and the false detection rate is high; the precision of the instruments used for detecting the steel wire ropes at home and abroad is uneven, most of the instruments can not effectively detect the defects in the steel wire ropes, and false detection and missing detection occur. Because accidents caused by defects of the steel wire rope frequently occur, an effective detection method for the defects of the steel wire rope is an urgent problem to be solved in the safe use of the steel wire rope.
Disclosure of Invention
The invention aims to change the traditional detection method, fully utilizes the advantages of simple structure, non-contact type detection signal easy processing and nondestructive detection of the electromagnetic sensor principle, better applies the electromagnetic sensing technology to the field of steel wire rope defect detection, and provides a stable and efficient steel wire rope defect online detection system with accurate detection.
The technical scheme adopted by the invention is as follows:
the novel electromagnetic sensor system for detecting the defects of the steel wire ropes comprises a sensor shell, wherein the sensor shell comprises an upper shell and a lower shell which are symmetrically arranged up and down, and a gap for the steel wire ropes to be detected to pass through is formed between the upper shell and the lower shell; along the direction that the wire rope that awaits measuring passed, upper and lower casing both ends upper and lower symmetry are equipped with and provide the magnetic means that the magnetic field just is used for magnetizing wire rope that awaits measuring for the casing is inside, and be equipped with the hall element that detects wire rope LF type defect and the induction coil that detects wire rope LMA type defect in the magnetic field, hall element link to each other with detection circuit board, induction coil all link to each other with data processing device.
Furthermore, the magnetic device is embedded at two ends of the sensor shell in a coaxial and concentric mode.
Further, the hall elements are provided with two groups, one group is connected with the detection circuit board I, the other group is connected with the detection circuit board II, the detection circuit board I, II is symmetrically arranged relative to the axis perpendicular to the axis direction of the wire rope to be detected, and each group of hall elements is wound along the circumferential direction of the wire rope to be detected.
Further, the detection circuit boards I, II are respectively in a semicircular structure with upper and lower symmetry, and are fixed in the sensor housing through a bracket.
Further, double rows of grooves are formed in the sensor shell, and the support is embedded in the grooves of the sensor shell.
Further, the induction coil is sleeved on the outer ring of the steel wire rope to be tested and is positioned between the detection circuit board I and the detection circuit board II.
Further, the induction coil is a split coil formed by winding enameled wires.
Further, the induction coil is connected with a detection circuit board III, and the detection circuit board III is connected with the data processing device.
Further, the data processing device is connected with a display device.
Further, the magnetic device adopts a permanent magnet.
According to the invention, two detection elements of the sensor are adopted to realize the respective detection of two defects, and the detection result is subjected to discriminant analysis by a subsequent data processing device, so that the detection precision is greatly improved. The sensor shell and the permanent magnet can form a stable magnetic loop in the steel wire rope, the leakage magnetic field and the magnetic flux change formed by defects are detected by the Hall element and the induction coil to form an analog voltage value, and then the detection circuit board is used for carrying out preliminary processing such as system zeroing, integral processing, differential processing, amplification, A/D conversion and the like and then sending the preliminary processing to the data processing device for further processing.
Since the wire rope is a strong magnetizer, the magnetic permeability of the wire rope is more than 100 times of that of air, if the wire rope is magnetized to saturation by a magnetic loop formed by the permanent magnet and the sensor shell, the magnetic permeability of the defect position of the wire rope is reduced, so that the magnetic resistance is increased, and a magnetic field leaking out of the surface of the wire rope is generated at the defect position, and the magnetic field is a leakage magnetic field for being detected by the detecting element. From software simulations and experimental analysis, it is known that: in the LF type defect, the size of the leakage magnetic field is related to the size and length of the defect, and the defect is larger or the defect length is longer, so that the density and peak value of the leakage magnetic field are both larger; for LMA type defects, the larger the damage amount of the sectional area of the steel wire rope and the longer the damage distance are, the smaller the magnetic flux passing through the inside of the steel wire rope is. The defect condition of the steel wire rope can be judged according to the signal detected by the detecting element.
The Hall element is a detection element which is made of a matrix semiconductor sheet material and works based on the Hall effect principle, when the Hall element is electrified, an external magnetic field passes through the Hall element in the vertical direction, and a Hall potential is generated by the Hall element, and the potential is proportional to current and magnetic field intensity. In the magnetic field, the output Hall voltage is
K in the formula h Is a hall constant; i c Is the input control current; b is the magnetic induction degree of the magnetic field;is the included angle between the direction of the magnetic induction intensity and the working surface of the Hall element. We put Hall element perpendicular to the surface of wire rope, can eliminate +.>Influence on the hall voltage. As can be derived from the formula, when a certain control current is used, the hall voltage is proportional to the magnetic induction. Therefore, when the Hall element is adopted to detect the leakage magnetic field, the magnitude of the leakage magnetic field can be judged according to the magnitude of the Hall voltage, and then the defect condition of the steel wire rope can be judged.
When the induction coil moves relative to the wire rope, if the internal magnetic flux of the wire rope changes, an induced electromotive force is generated in the induction coil, and the magnitude of the induced electromotive force is
e c ＝-ndΦ/dt＝-n(dΦ/ds)(ds/dt)＝-n(dΦ/ds)v
Where n is the number of turns of the induction coil, dΦ/ds is the rate of change of the internal magnetic flux of the wire rope relative to the amount of movement of the wire rope, and v is the speed of the wire rope relative to the induction coil. It can be seen from the formula that when the number of turns and the running speed of the induction coil are fixed, the electromotive force generated by the induction coil is only related to the change condition of the magnetic flux in the steel wire rope. Thus, when internal magnetic flux changes due to damage within the wire rope, an induction coil may be used to effect detection of a wire rope LMA type defect. When detecting LMA type defects with longer distance, the voltage signal detected by the induction coil is usually in mV level due to the characteristic of slow defect change, the amplitude is smaller, the duration is short, and the signal and the magnetic flux are related to the differential dphi/ds of time, so that the signal can be more visual by adopting an integration method to process the detection signal.
The beneficial effects of the invention are as follows:
the sensor judges the existence of defects and the damage degree of the defects through detecting the leakage magnetic field of the steel wire rope, specifically comprises a Hall element for detecting the leakage magnetic flux of the steel wire rope and an induction coil for detecting the main magnetic flux of the steel wire rope to judge the damage condition of LF type defects and LMA type defects of the steel wire rope, thereby realizing the quantification of the internal and external defects of the steel wire rope, and obtaining the damage degree and the damage position of the steel wire rope through the analysis of detection signals.
The sensor can magnetize the steel wire rope to a saturated state, and specifically, a complete magnetic loop is formed by using a permanent magnet, a sensor shell and the passed steel wire rope, so that the steel wire rope is magnetized completely. The sensor shell, the induction coil and the detection circuit board all adopt split structures, the structure is convenient to detach and adjust the sensor, the trouble of winding the induction coil on site is eliminated, and the on-line detection of the steel wire rope is convenient to realize.
In the defect measurement process of the steel wire rope, the accurate measurement of the defects is easily realized by the mode that different detection elements detect different types of defects, and the detection range of the Hall element is limited, so that the mode of circumferentially arranging the Hall element is adopted so as to realize the full coverage of the circumferential range of the steel wire rope. In order to filter the influence of interference signals in a detection environment on a detection result, the method of differential processing is adopted, signals detected by a single row of Hall elements are overlapped together through an addition circuit, and then the two paths of overlapped signals are subjected to differential processing. The induction coil is insensitive to the change of the magnetic field, so that the LMA signal detected by the induction coil is subjected to integral processing, and the detection signal can more intuitively reflect the defect condition.
The electromagnetic detection technology is applied to the defect detection of the steel wire rope, so that the real-time processing and automatic nondestructive detection of the damage signal of the steel wire rope are realized, and various defect parameters can be measured simultaneously.
Drawings
FIG. 1 is a block diagram of a system for detecting defects in a wire rope using electromagnetic sensors;
FIG. 2 is a block diagram of an analog signal processing circuit;
FIG. 3 is a schematic diagram of the positions of the detection circuit board and the Hall element;
FIG. 4 is a block diagram of a sensor;
the wire rope to be tested is 1, a Hall element, 3, a detection circuit board, 4, an induction coil, 5, a data processing device, 6, a display device, 7, a Hall element detection signal, 8, an induction coil detection signal, 9, a zeroing amplifying module, 10, an adding amplifying module, 11, a differential amplifying module, 12, an integrating module, 13, an A/D conversion module, 14, a permanent magnet, 15, a sensor housing, 16, a detection circuit board bracket and 17, a wire.
Detailed Description
The invention will be further described with reference to the drawings and examples.
In the prior art, a sensor is used for detecting defects, wherein when a Hall element is used for detecting LMA signals, detection signals are weak, and the detection effect is not obvious due to the influence of interference signals; the induction coil is insensitive, so that when the induction coil is used for detecting LF type defects, the detection signal time is too short, the micro defects cannot be identified, and the detection precision is low. In order to overcome the defects, the system adopts two detection elements to respectively detect the two defects, and analysis and screening are carried out on detection signals through a subsequent circuit, so that damage conditions of the defects of different types are obtained.
The novel electromagnetic sensor system for detecting the defects of the steel wire rope comprises a sensor shell 15, wherein the sensor shell 15 comprises an upper shell and a lower shell which are symmetrically arranged up and down, and a gap for the steel wire rope 1 to be detected to pass through is formed between the upper shell and the lower shell; along the direction that wire rope passed, upper and lower both ends upper and lower casing are equipped with the magnetic means that provides the magnetic field and be used for magnetizing wire rope that awaits measuring for the casing is inside, and be equipped with the hall element 2 that detects wire rope LF type defect and the induction coil 4 that detects wire rope LMA type defect in the magnetic field, hall element and induction coil all link to each other with detection circuit board, detection circuit board link to each other with data processing device.
As shown in fig. 1, 2, 3 and 4, the invention comprises 8 hall elements 2, a detection circuit board 3, an induction coil 4, a data processing device 5, a display device 6, a permanent magnet 14 and a sensor housing 15;
the four Hall elements are in a group and are placed on the detection circuit board 3 which is vertically symmetrical, the detection circuit board 3 comprises two semicircular structures, after the two semicircular structures are placed together, a steel wire rope just passes through the middle of the two semicircular structures, and the detection circuit board 3 is fixed on the detection circuit board bracket 16 through screws and is connected with the data processing device 5 through a lead 17;
the four Hall elements encircle the circumferential direction of the steel wire rope to be tested;
the induction coil 4 is connected with a detection circuit board III, and the detection circuit board III is connected with a data processing device; the detection circuit board III is omitted in the figure, and the induction coil 4 and the data processing device 5 are connected by a wire 17; the induction coil 3 adopts a split structure, and can be directly buckled around the steel wire rope during detection.
Permanent magnets 14 are disposed on opposite sides of the sensor housing 15. The bottom circle of the detection circuit board and the size of the induction coil are selected according to the diameter of the steel wire rope to be detected.
Furthermore, the magnetic device is embedded at two ends of the sensor shell in a coaxial and concentric mode.
Further, a double-row groove is formed in the sensor housing 15, and a detection circuit board bracket 16 is embedded in the groove of the sensor housing.
Further, the induction coil 4 is sleeved on the outer ring of the steel wire rope to be tested and is positioned between the two detection circuit boards 3.
Further, the induction coil 4 is a split coil formed by winding enameled wires.
Further, the data processing device 5 is connected to a display device 6, and the display device 6 displays the defect type of the steel wire rope.
As shown in fig. 2, the multi-channel hall element detection signal 7 is sent to the zeroing amplifying module 9, the zeroing amplifying module 9 is sent to the summing amplifying module 10, the summing amplifying module 10 sends the processed signal to the differential amplifying module 11, the differential amplifying module sends the processed signal to the a/D converting module 13, and the a/D converting module 13 is connected with the data processing device 5.
The induction coil detection signal 8 is directly connected to an integration module 12, the integration module 12 being connected to the data processing device 5.
Further, the zeroing amplifying module 9, the summing amplifying module 10, the differential amplifying module 11, the integrating module 12, and the a/D converting module 13 are all existing modules, and are not described herein.
Further, the data processing device 5 is a device with data processing function such as a PC or a single-chip microcomputer.
According to the invention, two detection elements of the sensor are adopted to realize the respective detection of two defects, and the detection result is subjected to discriminant analysis by a subsequent data processing device, so that the detection precision is greatly improved. The sensor shell and the permanent magnet can form a stable magnetic loop in the steel wire rope, the leakage magnetic field and the magnetic flux change formed by defects are detected by the Hall element and the induction coil to form an analog voltage value, and then the detection circuit board is used for carrying out system zeroing, integral processing, differential processing, amplification and A/D conversion acquisition data and sending the data to the data processing device for processing.
Since the wire rope is a strong magnetizer, the magnetic permeability of the wire rope is more than 100 times of that of air, if the wire rope is magnetized to saturation by a magnetic loop formed by the permanent magnet and the sensor shell, the magnetic permeability of the defect position of the wire rope is reduced, so that the magnetic resistance is increased, and a magnetic field leaking out of the surface of the wire rope is generated at the defect position, and the magnetic field is a leakage magnetic field for being detected by the detecting element. From software simulations and experimental analysis, it is known that: in the LF type defect, the size of the leakage magnetic field is related to the size and length of the defect, and the defect is larger or the defect length is longer, so that the density and peak value of the leakage magnetic field are both larger; for LMA type defects, the larger the damage amount of the sectional area of the steel wire rope and the longer the damage distance are, the smaller the magnetic flux passing through the inside of the steel wire rope is. The defect condition of the steel wire rope can be judged according to the signal detected by the detecting element.
The Hall element is a detection element which is made of a matrix semiconductor sheet material and works based on the Hall effect principle, when the Hall element is electrified, an external magnetic field passes through the Hall element in the vertical direction, and a Hall potential is generated by the Hall element, and the potential is proportional to current and magnetic field intensity. In the magnetic field, the output Hall voltage is
K in the formula h Is a hall constant; i c Is the input control current; b is the magnetic induction degree of the magnetic field;is the included angle between the direction of the magnetic induction intensity and the working surface of the Hall element. We put Hall element perpendicular to the surface of wire rope, can eliminate +.>Influence on the hall voltage. As can be derived from the formula, when a certain control current is used, the hall voltage is proportional to the magnetic induction. Therefore, when the Hall element is adopted to detect the leakage magnetic field, the magnitude of the leakage magnetic field can be judged according to the magnitude of the Hall voltage, and then the defect condition of the steel wire rope can be judged.
When the induction coil moves relative to the wire rope, if the internal magnetic flux of the wire rope changes, an induced electromotive force is generated in the induction coil, and the magnitude of the induced electromotive force is
e c ＝-ndΦ/dt＝-n(dΦ/ds)(ds/dt)＝-n(dΦ/ds)v
Where n is the number of turns of the induction coil, dΦ/ds is the rate of change of the internal magnetic flux of the wire rope relative to the amount of movement of the wire rope, and v is the speed of the wire rope relative to the induction coil. It can be seen from the formula that when the number of turns and the running speed of the induction coil are fixed, the electromotive force generated by the induction coil is only related to the change condition of the magnetic flux in the steel wire rope. Thus, when internal magnetic flux changes due to damage within the wire rope, an induction coil may be used to effect detection of a wire rope LMA type defect. When detecting LMA type defects with longer distance, the voltage signal detected by the induction coil is usually in mV level due to the characteristic of slow defect change, the amplitude is smaller, the duration is short, and the signal and the magnetic flux are related to the differential dphi/ds of time, so that the signal can be more visual by adopting an integration method to process the detection signal.
When the sensor is used, the sensor shell and the permanent magnet magnetize the steel wire rope to saturation, so that the steel wire rope passes through the detection circuit board and the induction coil, if the steel wire rope is defective, a leakage magnetic field is generated on the surface of the steel wire rope, when the steel wire rope passes through the detection circuit board and the induction coil, the leakage magnetic field can be detected by the induction coil and the Hall element arranged on the detection circuit board, and correspondingly, voltage signals are generated on the two detection elements, and the generated voltage signals are related to the defect condition of the steel wire rope. The voltage signal generated by the Hall element is subjected to addition amplification and differential amplification to eliminate interference signals, then A/D conversion is carried out, the voltage signal generated by the induction coil is subjected to integral processing, then amplification and A/D conversion are carried out, the received digital signal is processed, signal extraction is carried out by a PC, and the internal and external defect condition of the steel wire rope is obtained through comparison analysis with a standard value.
Claims (8)
1. Novel electromagnetic sensor system for detecting defects of steel wire ropes, which is characterized in that: the sensor comprises a sensor shell, wherein the sensor shell comprises an upper shell and a lower shell which are arranged in an upper-lower symmetrical way, and a gap for a wire rope to be tested to pass through is formed between the upper shell and the lower shell; along the passing direction of the steel wire rope to be tested, magnetic devices which provide magnetic fields for the inside of the shell and are used for magnetizing the steel wire rope to be tested are symmetrically arranged at the upper end and the lower end of the upper shell and the lower end of the lower shell, a Hall element for detecting LF type defects of the steel wire rope and an induction coil for detecting LMA type defects of the steel wire rope are arranged in the magnetic fields, the Hall element is circumferentially arranged in a manner so as to realize full coverage of the circumferential range of the steel wire rope and differential processing of the Hall element in a double row manner, signals detected by a single row of Hall elements are firstly overlapped together through an addition circuit, and then the two paths of signals which are overlapped together are subjected to differential processing;
integrating the LMA signal detected by the induction coil, wherein the Hall element and the induction coil are connected with a detection circuit board, and the detection circuit board is connected with a data processing device;
the magnetic devices are embedded at two ends of the sensor shell in a coaxial and concentric mode;
the Hall elements are provided with two groups, one group is connected with the detection circuit board I, the other group is connected with the detection circuit board II, the detection circuit board I, II is symmetrically arranged relative to an axis perpendicular to the axis direction of the steel wire rope to be detected, and each group of Hall elements surrounds the steel wire rope to be detected along the circumferential direction of the steel wire rope to be detected;
when the sensor is in operation, the sensor shell and the permanent magnet magnetize the steel wire rope to be saturated, so that the steel wire rope passes through the detection circuit board and the induction coil, if the steel wire rope is defective, a leakage magnetic field is generated on the surface of the steel wire rope, when the steel wire rope passes through the detection circuit board and the induction coil, the leakage magnetic field is detected by the induction coil and the Hall element arranged on the detection circuit board, and correspondingly, voltage signals are generated on the two detection elements, and the generated voltage signals are related to the defect condition of the steel wire rope; the voltage signal generated by the Hall element is subjected to addition amplification and differential amplification to eliminate interference signals, then A/D conversion is carried out, the voltage signal generated by the induction coil is subjected to integral processing, then amplification and A/D conversion are carried out, the received digital signal is processed, signal extraction is carried out by a PC, and the internal and external defect condition of the steel wire rope is obtained through comparison analysis with a standard value.
2. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the detection circuit boards I, II respectively adopt semicircular structures which are symmetrical up and down and are fixed in the sensor shell through a bracket.
3.A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 2, wherein: the sensor shell is internally provided with double rows of grooves, and the bracket is embedded in the grooves of the sensor shell.
4. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the induction coil is sleeved on the outer ring of the steel wire rope to be tested and is positioned between the detection circuit board I and the detection circuit board II.
5. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the induction coil is a split coil formed by winding enamelled wires.
6. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the induction coil is connected with the detection circuit board III, and the detection circuit board III is connected with the data processing device.
7. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the data processing device is connected with a display device.
8. A novel electromagnetic sensor system for detecting wire rope defects as recited in claim 1, wherein: the magnetic device adopts a permanent magnet.
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| CN201610624201.8A CN106290553B (en) | 2016-08-02 | 2016-08-02 | Novel electromagnetic sensor system for detecting defects of steel wire rope |
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| CN111024807B (en) * | 2019-12-18 | 2022-04-29 | 哈尔滨工业大学（深圳） | Steel wire rope magnetic flux damage detection and quantification method |
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|---|---|---|---|---|
| CN2157517Y (en) * | 1993-07-09 | 1994-02-23 | 韩文彬 | Wire rope flaw detector |
| CN202372474U (en) * | 2011-12-15 | 2012-08-08 | 洛阳泰斯特探伤技术有限公司 | Intrinsic safety carried type steel wire rope inspection device |
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