CN104165923A - Nondestructive flaw detection device for metal wire/pipe - Google Patents
Nondestructive flaw detection device for metal wire/pipe Download PDFInfo
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- CN104165923A CN104165923A CN201310180493.7A CN201310180493A CN104165923A CN 104165923 A CN104165923 A CN 104165923A CN 201310180493 A CN201310180493 A CN 201310180493A CN 104165923 A CN104165923 A CN 104165923A
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Abstract
The invention discloses a nondestructive flaw detection device for a metal wire/pipe. The device comprises a measurement coil and a magnetic field coil that are mutually nested. The magnetic field coil is connected to a power source, and an amplifier is connected to the measurement coil and transmits the measurement signal to a frequency analyzer and a current/voltage converter respectively. The nondestructive flaw detection method includes the steps of: (1) energizing the magnetic field coil by the power source to form an electromagnetic field; (2) establishing measurement standards, passing the to-be-measured metal wire/pipe through the magnetic field coil and the measurement coil to do longitudinal motion, performing real-time measurement and induction of the frequency information and current/voltage information of a coil measurement signal, and selecting a most stable frequency value and current/voltage value as standard values; and (3) repeating the longitudinal motion of the to-be-measured metal wire/pipe along the coils, conducting real-time measurement of frequency information and current/voltage information and performing comparison with the standard values, when the difference between the measured frequency or current/voltage value and the standard values is more than +/-10%, emitting alarm information by an alarm prompt module. According to the invention, by measuring the magnetic field change signals when different positions of the to-be-measured member stretch into a high frequency magnetic field, whether a position has a flaw can be determined, thus realizing relative measurement of the quality defect of the whole to-be-measured member. The measurement method is simple, and the result is reliable.
Description
Technical field
The invention belongs to material technical field of nondestructive testing, what be specifically related to is the devices and methods therefor that carries out nondestructive examination for metal wire rod/tubing.
Background technology
Metal pipe material or wire rod are in commercial production material, to use very general starting material.Metal pipe material or wire rod are made normally metal are melted to rear cast molding by high-temperature smelting pot, for metallic crystal in the process that is cast into wire rod, wire rod quality is along its length not perfect, total defect existing more or less, lossless detection how to realize wire rod External Defect and inherent vice is the key that judges wire quality height.
Conventionally adopt five large class methods to detect a flaw at field of non destructive testing at present: ray, ultrasound wave, eddy current, magnetic (leakage field, magnetic memory) and infiltration technology.Ray: can only carry out respectively inside and outside defects detection to workpiece in specific plumbous room, ray detection will produce radiation, causes human body infringement, and testing cost is high and dangerous, and can not be used for online detection; Ultrasound wave: can only carry out part to inside workpiece and detect, need according to parts customization special module to be detected and probe simultaneously, efficiency is low, can not be used for online detection; Eddy current: the shallow surface that can only treat test material is detected, and can not detect inside, and require measured material surface cleaning smooth, the center that measured material is positioned probe could be used for online detection; Magnetic: the huge utility appliance of equipment is many, need to magnetize workpiece, applies magnetic and detects, and can only locally detect, and can not be used for online detection; Infiltration: can only detect the open crackle of surface of the work, can not detect inside workpiece, more can not be used for online detection.All synchronous inside and outside defects of test material of above five large class methods, more can not be for the production of the online comprehensive detection of line.
There is various fractures, inconsistent phenomenon in metal lattice itself in the defect source of metal material, lattice imperfection is how much arranging and distinguish in lattice by it, mainly contains three classes: point defect, line defect and planar defect ".The crackle, trachoma, the bubble that in metal material, exist, be mingled with, the hardness of the physical imperfection such as material is loose and the chemical imperfection such as burn into material is unbalanced and material and toughness is unbalanced etc. that mechanics defect is all due to the performance of the crystalline network origination point defect of metal material, line defect, planar defect.In the magnetic field that the metal wire rod of different defects changes at high frequency, can cause the variation of magnetic field sensor signal parameter.Utilize and measure the information change comprising in magnetic field sensor signal, can realize determining of defective locations.The present invention is exactly according to this principle, has designed a set of metal lattice relative measurement apparatus and method to the nondestructive examination of metal wire rod/tubing
Summary of the invention
When object of the present invention utilizes metal lattice defect to exist exactly, frequency, current/voltage that inductive electromagnetic field signal comprises change the lossless detection of realizing metal wire rod relatively.
The present invention realizes foregoing invention object technical scheme: metal wire rod non-destructive detection device, comprise mutually nested measuring coil and field coil, field coil connects power supply, formation and modification electromagnetic field therein, amplifier connects measuring coil and measuring-signal is sent to respectively to frequency analyzer and current/voltage converter.In use, metal wire rod to be measured is along measuring coil and field coil lengthwise movement for said apparatus.In field coil, form high-frequency current signal as the high-frequency current signal source of power supply and produce high-frequency electromagnetic field signal, measuring coil produces electric signal in the induction field changing, because the wire quality going deep in measuring coil changes, frequency, the induction current/voltage of electric signal all will change, and can judge the position that occurs defect according to the size of changing value.
Measuring-signal in above-mentioned measuring coil is ac current signal, thereby this AC signal is regulated and realized frequency analyzer and current/voltage converter sensitive measurement by amplifier.
After measuring-signal and standard value are compared, by being installed on frequency analyzer and current/voltage converter, alarm module shows.
Utilize above-mentioned metal wire rod non-destructive detection device to carry out the method for nondestructive examination, step is as follows: (1) is that field coil energising forms electromagnetic field by power supply; (2) set up measurement standard, metal wire rod to be measured, through field coil and measuring coil lengthwise movement, is measured frequency information and the current/voltage information of inductive coil measuring-signal in real time, and selecting the most stable frequency values and current/voltage value is standard value; (3) repeat to be measured along longitudinal the moving of coil, in real time survey frequency information and current/voltage information and with standard value comparison, exceed when the frequency measuring or current/voltage value and standard value differ ± 10% time, the alarm module on frequency analyzer or current/voltage converter is sent warning message.
The present invention is in the time of work, first in coil portion produces high-frequency induction magnetic field, to be measured is longitudinally moved in magnetic field, measure the most stable frequency values and current/voltage value as standard value, magnetic field variation signal while stretching into by measuring to be measured of diverse location determines whether this position exists defect, thereby realizes the relative measurement of whole to be measured mass defect.Measuring method is simple, reliable results, measures cost far below traditional method of detection.
Brief description of the drawings
Fig. 1 is invention non-destructive detection device structure principle chart;
In figure, 1, measuring coil; 2, field coil; 3, metal wire rod to be measured.
Embodiment
Below in conjunction with accompanying drawing, structure and the method for invention are explained in detail to explanation, if Fig. 1 is invention non-destructive detection device structure principle chart, as shown in the figure, metal wire rod/tubing non-destructive detection device of the present invention, comprise mutually nested measuring coil 1 and field coil 2, field coil connects power supply, formation and modification electromagnetic field therein, and amplifier connects measuring coil and measuring-signal is sent to respectively to frequency analyzer and current/voltage converter.
In measuring process, metal wire rod 3 to be measured is along measuring coil and field coil lengthwise movement, and the signal parameter when measuring respectively defectiveness and zero defect position and entering measuring coil changes, and by the difference of comparison signal parameter, determines defective locations.Above-mentioned metal wire rod can be also metal pipe material.
In apparatus of the present invention, the power supply being connected with field coil is high-frequency current signal source, and it forms high-frequency current and produces high frequency magnetic field in field coil.
The measuring-signal of surveying in above-mentioned high frequency magnetic field in measuring coil is ac current signal, and ac signal amplifies to improve sensitivity by amplifier.
When detecting after defective locations, the alarm module of installing on frequency analyzer and current/voltage converter starts the instruction of reporting to the police.
The method step that utilizes above-mentioned metal wire rod/tubing non-destructive detection device to carry out nondestructive examination is as follows: (1) is that field coil energising forms electromagnetic field by power supply; (2) set up measurement standard, metal wire rod to be measured, through field coil and measuring coil lengthwise movement, is measured frequency information and the current/voltage information of inductive coil measuring-signal in real time, and selecting the most stable frequency values and current/voltage value is standard value; (3) repeat to be measured along longitudinal the moving of coil, in real time survey frequency information and current/voltage information and with standard value comparison, exceed when the frequency measuring or current/voltage value and standard value differ ± 10% time, the alarm module on frequency analyzer or current/voltage converter is sent warning message.
Technique scheme has only embodied the optimal technical scheme of technical solution of the present invention, and those skilled in the art have all embodied principle of the present invention to some variations that wherein some part may be made, within belonging to protection scope of the present invention.
Claims (6)
1. metal wire rod/tubing non-destructive detection device, comprise mutually nested measuring coil (1) and field coil (2), it is characterized in that, field coil connects power supply, formation and modification electromagnetic field therein, amplifier connects measuring coil and measuring-signal is sent to respectively to frequency analyzer and current/voltage converter.
2. metal wire rod non-destructive detection device according to claim 1, is characterized in that, metal wire rod to be measured (3) is along measuring coil and field coil lengthwise movement.
3. metal wire rod non-destructive detection device according to claim 1, is characterized in that, the power supply being connected with field coil is high-frequency current signal source.
4. metal wire rod non-destructive detection device according to claim 1, is characterized in that, the measuring-signal in measuring coil is ac current signal.
5. metal wire rod non-destructive detection device according to claim 1, is characterized in that, alarm module is installed on frequency analyzer and current/voltage converter.
6. utilize the method that metal wire rod non-destructive detection device carries out nondestructive examination described in the arbitrary claim of 1-5, it is characterized in that, this method of detection step is as follows: (1) is that field coil energising forms electromagnetic field by power supply; (2) set up measurement standard, metal wire rod to be measured, through field coil and measuring coil lengthwise movement, is measured frequency information and the current/voltage information of inductive coil measuring-signal in real time, and selecting the most stable frequency values and current/voltage value is standard value; (3) repeat to be measured along longitudinal the moving of coil, in real time survey frequency information and current/voltage information and with standard value comparison, exceed when the frequency measuring or current/voltage value and standard value differ ± 10% time, the alarm module on frequency analyzer or current/voltage converter is sent warning message.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180493.7A CN104165923A (en) | 2013-05-16 | 2013-05-16 | Nondestructive flaw detection device for metal wire/pipe |
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| CN201310180493.7A CN104165923A (en) | 2013-05-16 | 2013-05-16 | Nondestructive flaw detection device for metal wire/pipe |
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| CN201310180493.7A Pending CN104165923A (en) | 2013-05-16 | 2013-05-16 | Nondestructive flaw detection device for metal wire/pipe |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407043A (en) * | 2014-12-03 | 2015-03-11 | 江苏大学 | On-line defect detection device for steel cords based on electromagnetic induction and detection method thereof |
| CN106198722A (en) * | 2016-06-28 | 2016-12-07 | 天津因科新创科技有限公司 | The method and apparatus of Pulsed eddy current testing weld seam |
| CN106442706A (en) * | 2016-08-26 | 2017-02-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Underground dynamic steel wire detector |
| CN108051500A (en) * | 2018-02-24 | 2018-05-18 | 才楠 | A kind of vehicle carrying out flaw detection device and its detection method |
| CN108459073A (en) * | 2018-04-17 | 2018-08-28 | 东莞市慧眼数字技术有限公司 | Damaged metal detector based on electromagnetic conductive |
| CN109612537A (en) * | 2019-02-14 | 2019-04-12 | 欧传景 | A kind of the non-damage drive device and non-damage drive method of pearl type and pearl thickness degree |
| WO2019196081A1 (en) * | 2018-04-13 | 2019-10-17 | 丁炎 | Portable metal material nondestructive tester for textile enterprises |
| CN113579202A (en) * | 2021-09-06 | 2021-11-02 | 深圳市宝田精工科技有限公司 | Pure copper die-casting equipment and process |
| CN115219857A (en) * | 2022-07-14 | 2022-10-21 | 山西大学 | Coil micro-damage detection method based on pulse waveform comparison |
-
2013
- 2013-05-16 CN CN201310180493.7A patent/CN104165923A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 中国机械工程学会无损检测学会: "《涡流检测》", 30 November 1986 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407043A (en) * | 2014-12-03 | 2015-03-11 | 江苏大学 | On-line defect detection device for steel cords based on electromagnetic induction and detection method thereof |
| CN106198722A (en) * | 2016-06-28 | 2016-12-07 | 天津因科新创科技有限公司 | The method and apparatus of Pulsed eddy current testing weld seam |
| CN106198722B (en) * | 2016-06-28 | 2021-11-19 | 天津因科新创科技有限公司 | Method and device for detecting welding seam by pulse eddy current |
| CN106442706A (en) * | 2016-08-26 | 2017-02-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Underground dynamic steel wire detector |
| CN106442706B (en) * | 2016-08-26 | 2024-03-01 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Underground steel wire dynamic detector |
| CN108051500A (en) * | 2018-02-24 | 2018-05-18 | 才楠 | A kind of vehicle carrying out flaw detection device and its detection method |
| WO2019196081A1 (en) * | 2018-04-13 | 2019-10-17 | 丁炎 | Portable metal material nondestructive tester for textile enterprises |
| CN108459073A (en) * | 2018-04-17 | 2018-08-28 | 东莞市慧眼数字技术有限公司 | Damaged metal detector based on electromagnetic conductive |
| CN109612537A (en) * | 2019-02-14 | 2019-04-12 | 欧传景 | A kind of the non-damage drive device and non-damage drive method of pearl type and pearl thickness degree |
| CN109612537B (en) * | 2019-02-14 | 2024-04-19 | 广西诸宝科技开发有限公司 | Nondestructive identification device and nondestructive identification method for pearl type and thickness of pearl layer |
| CN113579202A (en) * | 2021-09-06 | 2021-11-02 | 深圳市宝田精工科技有限公司 | Pure copper die-casting equipment and process |
| CN115219857A (en) * | 2022-07-14 | 2022-10-21 | 山西大学 | Coil micro-damage detection method based on pulse waveform comparison |
| CN115219857B (en) * | 2022-07-14 | 2024-05-24 | 山西大学 | Coil micro-wound detection method based on pulse waveform comparison |
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