CN105510433B - A kind of metal tube electromagnetic nondestructive device based on dynamic raw eddy current - Google Patents
A kind of metal tube electromagnetic nondestructive device based on dynamic raw eddy current Download PDFInfo
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- CN105510433B CN105510433B CN201610084530.8A CN201610084530A CN105510433B CN 105510433 B CN105510433 B CN 105510433B CN 201610084530 A CN201610084530 A CN 201610084530A CN 105510433 B CN105510433 B CN 105510433B
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- 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
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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Abstract
The invention discloses a kind of metal tube electromagnetic nondestructive devices based on dynamic raw eddy current, dc magnetization coil, magneto-dependent sensor, signal conditioning circuit, capture card and the computer that conveyer, metal tube to be detected including transporting metal tube to be detected extend there through, magneto-dependent sensor, signal conditioning circuit, capture card and computer are sequentially connected, and the magneto-dependent sensor circumferentially by near region or/and leaves area's arrangement in dynamic raw eddy current concentration around metal tube to be detected.Metal tube to be detected transports through dc magnetization coil by conveyer, the electromagnetic field variation signal of magneto-dependent sensor pickup tube surface, electric signal is converted by electromagnetic field variation signal, electric signal amplifies through signal conditioning circuit, after filtering, A/D conversion is carried out by capture card, it is supplied to computer analysis processing, obtains the defect information of pipe fitting.The present invention can carry out the detection of accurate high speed to metal tube inside/outside portion defect, and apparatus structure is simple, and manufacturing cost is low.
Description
Technical field
The present invention relates to field of non destructive testing, and in particular to a kind of lossless inspection of metal tube electromagnetism based on dynamic raw eddy current
Device is surveyed, the high-speed lossless suitable for metal tube inside/outside portion defect detects.
Background technique
Currently, metal tube realizes the detection of its defect there are many lossless detection method, such as Magnetic testing, infiltration inspection
Survey, ultrasound detection, EDDY CURRENT, ray detection, exchange field detecting, exchange potential detection, DC potential detection and leakage field inspection
A variety of detection methods such as survey.
However, in existing metal tube lossless detection method, Magnetic testing (MPT, nineteen twenty-two U.S. Huo Ke) and infiltration
Detection (PT, 1940 Magnaflux companies of the U.S.) needs manual hand manipulation due to magnetic suck acts on or capillarity carefully shows principle,
Cause its inefficient；Ultrasound detection (UT, nineteen twenty-nine Russia Sokolov) is matched with detection frequency there is excitation and is limited
The problem of scanning speed；Inspection of the EDDY CURRENT (ECT, nineteen thirty-five Germany's Philip Hurst) due to skin effect and to inside pipe fitting defect
Dendrometry effect；Ray detection (RT, 1900 French customs) has radiativity, reduces use as far as possible in principle；Alternating-current field detection method
(ACFM, 1980 British Petroleum Companys) with exchange potential detection method (ACPD, 1980 University College Londons) and EDDY CURRENT
Method is the same, cannot detect internal flaw because of skin effect；DC potential method (DCPD, 1991Read and Pfuff) is a kind of base
In the probe electrical circuit contact measurement of fault location voltage change principle, high speed detection cannot achieve because of contact abrasion, and
There is the detection body failure of insulation attachment to surface；Magnetic Flux Leakage Inspecting method (MFL, 1923 U.S. Sperry) is only applicable to magnetic conductivity pipe
The defects detection of part, thus black to non-ferrous metal (non-magnetic electric conductor such as stainless steel, copper, aluminium and titanium alloy etc.) and high temperature
Non-ferrous metal failure (crosses curie point and loses magnetism), and in high speed detection, since magnetic lag effect leads to the magnetic of component
Change deficiency, and the magnetic flux leakage of sufficient intensity can not be generated.The metal tube lossless detection method of the above-mentioned prior art, all can not be real
High speed detection now is carried out to metal tube defect, cannot be met the needs of production.Therefore, it is urgent to provide one kind can be used for production practices
In the high speed detection method detected to metal tube inside/outside portion defect comprehensively.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of lossless inspections of metal tube electromagnetism based on dynamic raw eddy current
Device is surveyed, to realize the high speed detection requirement of metal tube inside/outside portion defect.
To achieve the above object, this invention takes following technical schemes:
Metal tube electromagnetic nondestructive device provided by the invention based on dynamic raw eddy current, constitute include transport to
Dc magnetization coil, magneto-dependent sensor, the signal tune that conveyer, the metal tube to be detected of detection metal tube extend there through
Reason circuit, capture card and computer, magneto-dependent sensor, signal conditioning circuit, capture card and computer are sequentially connected, the magnetosensitive
Sensor arranges in what dynamic raw eddy current was concentrated by near region or/and leave in area around metal tube to be detected is circumferential, detection dress
When setting operation, metal tube to be detected transports through dc magnetization coil by conveyer, and magneto-dependent sensor picks up tube surface
Electromagnetic field variation, convert electric signal for electromagnetic field variation, electric signal amplifies through signal conditioning circuit, after filtering, by acquiring
Card carries out A/D conversion, is supplied to computer and is analyzed and processed, obtains the defect information of pipe fitting.
In above-mentioned technical proposal of the invention, the magneto-dependent sensor is paid the utmost attention to be separately positioned on dc magnetization coil
What the dynamic raw eddy current in two sides was concentrated leans near region and leaves in area, and arranges along metal tube circumferential direction uniform array to be detected.Into one
The magneto-dependent sensor on step ground, the array arrangement can be arranged on dc magnetization coil by bracket.
In above-mentioned technical proposal of the invention, between the end face of the magneto-dependent sensor and metal tube surface to be detected
Distance be generally higher than 2.0mm；It is preferably controlled in 0.5mm~1.0mm range.
In above-mentioned technical proposal of the invention, the conveyer, preferably make its transport metal tube to be detected with
Dc magnetization coil coaxially passes through dc magnetization coil.
In above-mentioned technical proposal of the invention, the transmission device preferentially uses " V " type wheel conveyer, in DC magnetic
Pair " V " Xing Lun mechanism is at least respectively arranged on the both sides for changing coil.
In above-mentioned technical proposal of the invention, the movement speed that the conveyer transports metal tube to be detected is best
Not less than 3 ms/min.
In above-mentioned technical proposal of the invention, magnetic field strength can be as desired by the electrical current amplitude of magnetizing coil
It is adjusted.The radial magnetic field intensity that dc magnetization coil generates in magneto-dependent sensor layout area must not preferably be lower than
3000A/m。
The present inventor research in find, using dc magnetization coil as magnetic field sources, generated magnetic field for
The distributed magnetic field of radial component, when pipe fitting to be detected and dc magnetization coil coaxially pass through dc magnetization coil, due to metal
The direction of motion of tube material internal electron and the radial component in magnetic field are vertical, under the action of Lorentz force, in metal tube
Inside forms the eddy current closed loop being distributed uniformly and circumferentially, and when existing defects in pipe fitting, eddy current loop is being lacked
The conducting path for falling into place will be distorted, and detectable disturbance electromagnetic field is formed in tube surface, can be by metal tube
Surface layout magnetic susceptibility sensor array, picks up the electromagnetic field variation signal of tube surface, passes through tube surface electromagnetic field signal
Feature obtains the defects of pipe fitting information.The above-mentioned discovery that the present invention is based on inventor proposes technical side of the invention
Case.
Metal tube electromagnetic nondestructive device provided by the invention based on dynamic raw eddy current, wherein dc magnetization coil
The Distribution of Magnetic Field with radial component, cutting magnetic line when metal tube passes through coil, thus in metal tube are formed in space
Close dc magnetization coil is respectively formed dynamic raw eddy current, such as defective presence in metal tube, whirlpool with area is left by near region
Current conduction path will be distorted, and detectable disturbance electromagnetic field is formed in tube surface.It is leaning near region and is leaving area
The sensor array of tube surface circumferentially picks up and moves raw eddy current loop caused by defect and distort the disturbance electromagnetic field to be formed
Signal finally obtains the defects of pipe fitting information according to disturbance electromagnetic field signal feature.
Metal tube electromagnetic nondestructive device provided by the present invention based on dynamic raw eddy current, to move metal tube
The dynamic raw eddy current that cutting magnetic line generates in metal tube body eliminates high frequency alternating electromagnetic field skin effect as excitation
Influence, thus solve the problems, such as high-frequency electromagnetic detection investigation depth it is inadequate, thus can realize detection metal tube inside/outside portion
Defect.Again since the pipe fitting speed of service is faster, the intracorporal dynamic raw eddy current intensity of pipe fitting is bigger, and then flaw detection sensitivity
It is higher, the high speed detection requirement of final achievable metal tube inside/outside portion defect.
Detailed description of the invention
Fig. 1-1 is metal tube non-destructive testing device schematic view of the front view of the invention；
Fig. 1-2 is metal tube non-destructive testing device left view structural representation of the invention
Fig. 2 is the Distribution of Magnetic Field schematic diagram that dc magnetization coil generates；
Fig. 3 is that raw eddy current distribution schematic diagram is moved in metal tube；
Fig. 4 is Magnetosensitive sensor array arrangement schematic diagram；
Eddy current loop distribution schematic diagram when Fig. 5 is zero defect in metal tube；
Eddy current loop distribution schematic diagram when Fig. 6 is defective in metal tube.
Each shown by reference numeral in above-mentioned attached drawing indicates that object is respectively as follows: 1- metal tube to be measured；2- dc magnetization coil；3-
Conveyer；4,4'- Magnetosensitive sensor array；5- signal conditioning circuit；6- capture card；7- computer；8- bracket；9, the whirlpool 9'-
Circuit closed loop.
Specific embodiment
Provide a specific embodiment of the invention with reference to the accompanying drawing, and by specific embodiment to it is of the invention based on
The metal tube electromagnetic nondestructive device of dynamic raw eddy current is further described.It is important to note that of the invention
Specific embodiment is not limited to form described in embodiment.
The direction term being previously mentioned in the specific embodiment below, such as: upper and lower, left and right, front or rear etc., only
It is the direction with reference to attached drawing.Therefore, use direction term is of the invention for ease of description, is not intended to limit the invention.
The metal tube non-destructive testing device based on dynamic raw eddy current of the present embodiment, structure is as shown in Figure 1, constitute packet
It includes: transporting " V " type wheel conveyer 3 of metal tube 1 to be detected, the dc magnetization coil that metal tube to be detected extends there through
2, in the Magnetosensitive sensor array 4 and 4' of the circumferential 360 ° of arrangements in 2 two sides of dc magnetization coil, signal conditioning circuit 5, capture card 6
With computer 7.The Magnetosensitive sensor array 4 and 4' are fixed on dc magnetization coil 2 by four brackets 8, magneto-dependent sensor
End face and the distance between metal tube surface to be detected be 1.0mm.Metal tube 1 to be detected is in " V " type wheel conveyer 3
Driving under with 10 ms/min of speed make linear advancement movement, passed through from dc magnetization coil, by Magnetosensitive sensor array 4
It is picked up with 4' and disturbs electromagnetic field signal caused by the defects of metal tube, and convert electric signal for disturbance electromagnetic field signal,
After electric signal is amplified, filtered through signal conditioning circuit 5, A/D conversion is carried out into capture card 6, analog signal is converted
For digital signal, finally enters computer 7 and carry out signal processing and show.The dc magnetization coil can be in magneto-dependent sensor cloth
Set generation radial magnetic field intensity 5000A/m in region.
The Distribution of Magnetic Field that dc magnetization coil generates is as shown in Figure 2.With metal tube 1 (hereinafter referred to as pipe fitting) axis to be detected
Centered on line, cylindrical-coordinate system is established.Along the pipe fitting direction of motion, pipe fitting is divided into centered on dc magnetization coil 2 and is leaned on
It near region and leaves area, and magnetization conduction electric current in direction as shown in the figure is applied to magnetizing coil, the magnetizing field of formation is mainly characterized by comprising:
Entering pipe fitting from air by the near region magnetic line of force, is converging in the middle part of magnetizing coil, be then refracted into air leaving area.It will
Magnetizing field vector B (r, z) is decomposed into axial component Bz(r, z) and radial component Br(r,z).Radial component Br(r, z) is leaning near region
Inside pipe fitting is directed toward in direction, is changed in the middle part of magnetizing coil, is directed toward outside pipe fitting leaving area direction.It is coaxial with pipe fitting
Annulus l (r0,z0) directional velocity during advance and radial component Br(r, z) vertically, to can be generated in inside pipe fitting
Dynamic raw eddy current.
It is as shown in Figure 3 that raw eddy current distribution is moved in pipe fitting.Since pipe fitting 1 and magnetizing coil 2 are coaxial, according to the fortune of pipe fitting 1
Dynamic direction and magnetic field radial component BrThe distribution of (r, z), the free electron in pipe fitting is under the action of Lorentz force, in pipe fitting
By near region and leaving area, be respectively formed the eddy current closed loop 9 and 9' being distributed uniformly and circumferentially.Wherein, near region is leaned on
Dynamic raw eddy current closed loop 9 direction and magnetization conduction current direction on the contrary, and leaving area, move raw eddy current close ring
The direction of road 9' is identical as magnetization conduction current direction.
Magnetosensitive sensor array arrangement is as shown in Figure 4.By near region and area's arrangement is left in 2 two sides of dc magnetization coil
360 ° of complete cycles, the disturbance electromagnetic field for being respectively used to pick up near dynamic raw eddy current loop 9 and 9' was believed to sensor array 4 and 4'
Number.The variable signal of electromagnetic field is converted into electric signal by sensor array 4 and 4', then passes through signal conditioning circuit 5 and is put
Greatly, filter, later enter capture card 6 carry out A/D conversion, convert digital signal for analog signal, finally enter computer 7 into
Row signal processing is simultaneously shown.
Eddy current loop distribution in metal tube when zero defect is as shown in Figure 5.When metal tube 1 by near region and leaves area
When interior zero defect, dynamic raw eddy current 9 and 9' are uniformly distributed in pipe fitting, the electromagnetic field that sensor array 4 and 4' are picked up at this time
Signal is simultaneously without exception.
Eddy current loop distribution when defective in metal tube is as shown in Figure 6.If there are crackles etc. to lack in pipe fitting 1
It falls into, eddy current loop 9 and 9' will be distorted in the conducting path of fault location, and detectable disturbance electricity is formed in tube surface
Magnetic field.The sensor array 4 and 4' for being arranged in tube surface will pick up the variable signal for arriving the electromagnetic field, so that defect can be realized
Effective detection.
Claims (10)
1. a kind of metal tube electromagnetic nondestructive device based on dynamic raw eddy current, it is characterised in that: to be detected including transporting
Dc magnetization coil (2) that conveyer (3), the metal tube to be detected of metal tube (1) extend there through, magneto-dependent sensor,
Signal conditioning circuit (5), capture card (6) and computer (7), magneto-dependent sensor, signal conditioning circuit, capture card and computer according to
Secondary connection, the magneto-dependent sensor be separately positioned on that the dynamic raw eddy current in dc magnetization coil two sides concentrates by near region and leave area
It is interior, and arranged along metal tube circumferential direction uniform array to be detected, the end face of magneto-dependent sensor and metal tube surface to be detected it
Between distance be 0.5~1.0mm；It is described, along the pipe fitting direction of motion, to be with dc magnetization coil (2) with area is left by near region
Two regions that center divides；When detection device is run, metal tube to be detected transports through dc magnetization line by conveyer
Circle, magneto-dependent sensor pick up the electromagnetic field variation signal of tube surface, convert electric signal, electric signal for electromagnetic field variation signal
After signal conditioning circuit amplification, filtering, A/D conversion is carried out by capture card, computer is supplied to and is analyzed and processed, obtain pipe
The defect information of part.
2. the metal tube electromagnetic nondestructive device according to claim 1 based on dynamic raw eddy current, it is characterised in that:
The magneto-dependent sensor of array arrangement is arranged on dc magnetization coil by bracket (8).
3. the metal tube electromagnetic nondestructive device according to claim 1 or 2 based on dynamic raw eddy current, feature exist
In: the metal tube to be detected that the conveyer transports it is coaxially worn from dc magnetization coil with dc magnetization coil
It crosses.
4. the metal tube electromagnetic nondestructive device according to claim 1 or 2 based on dynamic raw eddy current, feature exist
In: the conveyer is " V " type wheel conveyer, and pair " V " Xing Lun mechanism is at least respectively arranged on the both sides of dc magnetization coil.
5. the metal tube electromagnetic nondestructive device according to claim 3 based on dynamic raw eddy current, it is characterised in that:
The conveyer is " V " type wheel conveyer, and pair " V " Xing Lun mechanism is at least respectively arranged on the both sides of dc magnetization coil.
6. the metal tube electromagnetic nondestructive device according to claim 1 or 2 based on dynamic raw eddy current, feature exist
In: the conveyer transports the movement speed of metal tube to be detected not less than 3 ms/min.
7. the metal tube electromagnetic nondestructive device according to claim 5 based on dynamic raw eddy current, it is characterised in that:
The conveyer transports the movement speed of metal tube to be detected not less than 3 ms/min.
8. the metal tube electromagnetic nondestructive device according to claim 1 or 2 based on dynamic raw eddy current, feature exist
In: the radial magnetic field intensity that dc magnetization coil generates in magneto-dependent sensor layout area must not be lower than 3000A/m.
9. the metal tube electromagnetic nondestructive device according to claim 6 based on dynamic raw eddy current, it is characterised in that:
The radial magnetic field intensity that dc magnetization coil generates in magneto-dependent sensor layout area must not be lower than 3000A/m.
10. the metal tube electromagnetic nondestructive device according to claim 7 based on dynamic raw eddy current, feature exist
In: the radial magnetic field intensity that dc magnetization coil generates in magneto-dependent sensor layout area must not be lower than 3000A/m.
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| CN105806935B (en) * | 2016-05-27 | 2024-03-12 | 三峡大学 | Quick detection device for weld defects of large-scale metal round pipe |
| CN106352787A (en) * | 2016-10-11 | 2017-01-25 | 武汉华宇目检测装备有限公司 | Array pulsed eddy current measurement method and device for ovality of steel pipe |
| CN106841306A (en) * | 2017-03-20 | 2017-06-13 | 四川大学 | A kind of inductive loop thermal imaging detection means based on rotating excitation field |
| JP7046720B2 (en) * | 2018-05-29 | 2022-04-04 | ナブテスコ株式会社 | Speed detection device and speed detection method |
| CN110057904B (en) * | 2019-04-29 | 2021-05-25 | 电子科技大学 | Method and device for quantitatively detecting defects of moving metal component |
| CN110108787B (en) * | 2019-05-07 | 2021-01-05 | 电子科技大学 | Rotatory metal component electromagnetism nondestructive test device based on motional vortex |
| CN112729622B (en) * | 2020-12-17 | 2022-07-22 | 上海电气集团股份有限公司 | Stress nondestructive testing method, device and equipment |
| CN112858466B (en) * | 2021-01-11 | 2024-05-14 | 无锡学院 | Quantitative evaluation method for cracks on inner surface of metal pipeline |
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