CN105510433A - Metal pipe electromagnetic nondestructive testing device based on motional eddy current - Google Patents
Metal pipe electromagnetic nondestructive testing device based on motional eddy current Download PDFInfo
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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 metal pipe electromagnetic nondestructive testing device based on motional eddy current. The metal pipe electromagnetic nondestructive testing device comprises a conveying device for conveying a to-be-detected metal pipe, a direct-current magnetizing coil through which the to-be-detected metal pipe penetrates, magneto-dependent sensors, a signal conditioning circuit, an acquisition card and a computer, the magneto-dependent sensors, the signal conditioning circuit, the acquisition card and the computer are sequentially connected, and the magneto-dependent sensors are arranged in the closing region and/or leaving region where motional eddy current is concentrated in the peripheral direction of the to-be-detected metal pipe. The to-be-detected metal pipe is conveyed through the conveying device to penetrate through the direct-current magnetizing coil, the magneto-dependent sensors pick up an electromagnetic field changing signal on the surface of the pipe, the electromagnetic field changing signal is converted into an electric signal, the electric signal is subjected to A/D conversion through the acquisition card after being amplified and filtered through the conditioning circuit and is provided for the computer to be processed, and defect information of the pipe is acquired. The metal pipe electromagnetic nondestructive testing device can accurately and fast detect defects inside/outside the metal pipe, and is simple in structure and low in manufacturing cost.
Description
Technical field
The present invention relates to field of non destructive testing, be specifically related to a kind of metal tube electromagnetic nondestructive device based on dynamic raw vortex flow, the high-speed lossless being applicable to metal tube inside/outside portion defect detects.
Background technology
At present, metal tube has multiple lossless detection method to realize the detection of its defect, as Magnetic testing, Liquid penetrant testing, Ultrasonic Detection, EDDY CURRENT, ray detection, alternating-current field detect, exchange the multiple detection methods such as potentiometry, DC potential detection and Magnetic Flux Leakage Inspecting.
But, in existing metal tube lossless detection method, Magnetic testing (MPT, nineteen twenty-two U.S. Huo Ke) and Liquid penetrant testing (PT, 1940 Magnaflux companies of the U.S.) need manual hand manipulation because magnetic suck effect or capillary action carefully show principle, cause its efficiency not high; Ultrasonic Detection (UT, nineteen twenty-nine Russia Sokolov) also exists excitation and limits the problem of sweep velocity with detecting frequency matching; EDDY CURRENT (ECT, nineteen thirty-five Germany Philip Hurst) lost efficacy to the detection of inside pipe fitting defect due to skin 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 Company p.l.c.s), with to exchange electromotive force detection method (ACPD, 1980 University College Londons) the same with detection method of eddy, can not detect inherent vice because of skin effect; DC potential method (DCPD, 1991Read and Pfuff) is a kind of probe based on fault location change in voltage principle electricity loop contact measurement, cannot realize high speed detection, and effects on surface has the detection bodies of insulation attachment to lose efficacy because of contact wearing and tearing; Magnetic Flux Leakage Inspecting method (MFL, 1923 U.S. Sperry) be only applicable to the defects detection of magnetic conductivity pipe fitting, thus to non-ferrous metal (non-magnetic electric conductor is as stainless steel, copper, aluminium and titanium alloy etc.) and high temperature black metal failure (crossing Curie point and lose magnetism), and when high speed detection, because magnetic lag effect causes the magnetization of component not enough, and the stray field of sufficient intensity cannot be produced.The metal tube lossless detection method of above-mentioned prior art, all cannot realize carrying out high speed detection to metal tube defect, can not meet the needs of production.Therefore, production practices are needed badly provides a kind of high speed detection method that can be used for comprehensively detecting metal tube inside/outside portion defect.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of metal tube electromagnetic nondestructive device based on dynamic raw vortex flow, to realize the high speed detection requirement of metal tube inside/outside portion defect.
For achieving the above object, this invention takes following technical scheme:
Metal tube electromagnetic nondestructive device based on dynamic raw vortex flow provided by the invention, its formation comprises the conveyer transporting metal tube to be detected, the DC magnetization coil that metal tube to be detected extends there through, magneto-dependent sensor, signal conditioning circuit, capture card and computing machine, magneto-dependent sensor, signal conditioning circuit, capture card is connected successively with computing machine, described magneto-dependent sensor is around metal tube to be detected circumference in the close district that dynamic raw vortex flow is concentrated or/and leave in district and arrange, when pick-up unit runs, metal tube to be detected transports through DC magnetization coil by conveyer, the electromagnetic field change of magneto-dependent sensor pickup tube surface, electromagnetic field change is converted into electric signal, electric signal amplifies through signal conditioning circuit, after filtering, A/D conversion is carried out by capture card, be supplied to computing machine and carry out analyzing and processing, obtain the defect information of pipe fitting.
In technique scheme of the present invention, described magneto-dependent sensor is paid the utmost attention to and is separately positioned on DC magnetization coil both sides and moves close district that raw vortex flow concentrates and leave in district, and along metal tube to be detected circumference uniform array layout.Further, the magneto-dependent sensor of described arranged in arrays by Bracket setting on DC magnetization coil.
In technique scheme of the present invention, the distance between the end face of described magneto-dependent sensor and metal tube surface to be detected is generally greater than 2.0mm; Preferably control in 0.5mm ~ 1.0mm scope.
In technique scheme of the present invention, described conveyer, the metal tube to be detected preferably making it transport and DC magnetization coil are coaxially through DC magnetization coil.
In technique scheme of the present invention, described conveyer preferentially adopts " V " type to take turns conveyer, at least respectively arranges a pair " V " type wheel mechanism on the both sides of DC magnetization coil.
In technique scheme of the present invention, the translational speed that described conveyer transports metal tube to be detected is preferably not less than 3 ms/min.
In technique scheme of the present invention, magnetic field intensity can be regulated by the electrical current amplitude of magnetizing coil as required.The radial magnetic field intensity that DC magnetization coil produces in magneto-dependent sensor layout area preferably must not lower than 3000A/m.
Find in the present inventor's research, using DC magnetization coil as Magnetic Field Source, the magnetic field produced is the distributed magnetic field with radial component, when pipe fitting to be detected and DC magnetization coil are coaxially through DC magnetization coil, because the direction of motion of metal tube material internal electronics is vertical with the radial component in magnetic field, under the effect of Lorentz force, along the circumferential direction equally distributed vortex flow closed circuit is formed in metal tube inside, when in pipe fitting during existing defects, vortex flow loop will distort at the conducting path of fault location, and form detectable disturbance electromagnetic field at tube surface, by arranging magnetic susceptibility sensor array on metal tube surface, the electromagnetic field variation signal of pickup tube surface, the defect information in pipe fitting is obtained by tube surface electromagnetic field signal feature.The present invention proposes technical scheme of the present invention based on the above-mentioned discovery of inventor just.
Metal tube electromagnetic nondestructive device based on dynamic raw vortex flow provided by the invention, wherein DC magnetization coil forms the Distribution of Magnetic Field with radial component in space, metal tube is by cutting magnetic line during coil, thus at metal tube near the close district of DC magnetization coil with leave district and form dynamic raw vortex flow respectively, as defectiveness exists in metal tube, vortex flow conducting path will distort, and forms detectable disturbance electromagnetic field at tube surface.Near district and the tube surface sensor array circumferentially leaving district, pick up the disturbance electromagnetic field signal of the dynamic raw vortex flow loop distortion formation that defect causes, finally obtain the defect information in pipe fitting according to disturbance electromagnetic field signal feature.
Metal tube electromagnetic nondestructive device based on dynamic raw vortex flow provided by the present invention, the dynamic raw vortex flow produced in metal tube body using motion metal tube cutting magnetic line is as excitation, eliminate the impact of high-frequency alternating electromagnetic field skin effect, thus solve the inadequate problem of high-frequency electromagnetic detection investigation depth, thus detection metal tube inside/outside portion defect can be realized.Again because pipe fitting travelling speed is faster, the dynamic raw vortex flow intensity in pipe fitting is larger, and then flaw detection sensitivity is also higher, finally can realize the high speed detection requirement of metal tube inside/outside portion defect.
Accompanying drawing explanation
Fig. 1-1 is the main TV structure schematic diagram of metal tube the cannot-harm-detection device of the present invention;
Fig. 1-2 is the left TV structure schematic diagram of metal tube the cannot-harm-detection device of the present invention
Fig. 2 is the Distribution of Magnetic Field schematic diagram that DC magnetization coil produces;
Fig. 3 is dynamic raw eddy current distribution schematic diagram in metal tube;
Fig. 4 is that Magnetosensitive sensor array arranges schematic diagram;
Vortex flow loop distribution schematic diagram when Fig. 5 is zero defect in metal tube;
Vortex flow loop distribution schematic diagram when Fig. 6 is defectiveness in metal tube.
Each shown by reference numeral in above-mentioned accompanying drawing represents that object is respectively: 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-computing machine; 8-support; 9,9'-vortex flow closed circuit.
Embodiment
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing, and by embodiment, the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow of the present invention is further described.It is important to note that the specific embodiment of the present invention is not limited to the form described by embodiment.
The direction term mentioned in described embodiment below such as: upper and lower, left and right, front or rear etc., is only the direction with reference to accompanying drawing.Therefore, user is the present invention for convenience of explanation to term, is not used for limiting the present invention.
Metal tube the cannot-harm-detection device based on dynamic raw vortex flow of the present embodiment, its structure as shown in Figure 1, formation comprises: " V " type wheel conveyer 3 transporting metal tube 1 to be detected, the DC magnetization coil 2 that metal tube to be detected extends there through, at Magnetosensitive sensor array 4 and 4' that DC magnetization coil 2 both sides circumference 360 ° is arranged, signal conditioning circuit 5, capture card 6 and computing machine 7.Described Magnetosensitive sensor array 4 is fixed on DC magnetization coil 2 with 4' by four supports 8, and the distance between the end face of magneto-dependent sensor and metal tube surface to be detected is 1.0mm.Metal tube 1 to be detected does linear advancement motion with 10 ms/min of speed under the driving of " V " type wheel conveyer 3, pass from DC magnetization coil, the disturbance electromagnetic field signal that the defect in metal tube causes is picked up by Magnetosensitive sensor array 4 and 4', and disturbance electromagnetic field signal is converted into electric signal, electric signal carries out amplifying through signal conditioning circuit 5, after filtering, enter capture card 6 and carry out A/D conversion, simulating signal is converted into digital signal, finally enters computing machine 7 and carry out signal transacting and show.Described DC magnetization coil can produce radial magnetic field intensity 5000A/m in magneto-dependent sensor layout area.
The Distribution of Magnetic Field that DC magnetization coil produces as shown in Figure 2.Centered by metal tube 1 (hereinafter referred to as pipe fitting) axis to be detected, set up cylindrical-coordinate system.Along pipe fitting direction of motion, pipe fitting be divided near district centered by DC magnetization coil 2 and leave district, and direction magnetization conduction current is as shown in the figure applied to magnetizing coil, the magnetizing field principal character formed is: from air, entering pipe fitting near district's magnetic line of force, converge in the middle part of magnetizing coil, be then refracted in air leaving district.Magnetizing field vector B (r, z) is decomposed into axial component B
z(r, z) and radial component B
r(r, z).Radial component B
r(r, z), pointing to inside pipe fitting near direction, district, for changing in the middle part of magnetizing coil, leaving, direction, district sensing pipe fitting is outside.Annulus l (the r coaxial with pipe fitting
0, z
0) velocity reversal in advance process and radial component B
r(r, z) is vertical, thus can produce dynamic raw vortex flow at inside pipe fitting.
In pipe fitting, dynamic raw eddy current distribution as shown in Figure 3.Because pipe fitting 1 is coaxial with magnetizing coil 2, according to direction of motion and the magnetic field radial component B of pipe fitting 1
rthe distribution of (r, z), the free electron in pipe fitting under the effect of Lorentz force, the close district of pipe fitting with leave district, form along the circumferential direction equally distributed vortex flow closed circuit 9 and 9' respectively.Wherein, the direction of the dynamic raw vortex flow closed circuit 9 near district is contrary with magnetization conduction current direction, and is leaving district, and the direction of dynamic raw vortex flow closed circuit 9' is identical with magnetization conduction current direction.
Magnetosensitive sensor array is arranged as shown in Figure 4.DC magnetization coil 2 both sides close district with leave district arrange 360 ° all-round to sensor array 4 and 4', be respectively used to pick up the disturbance electromagnetic field signal near dynamic raw vortex flow loop 9 and 9'.The variable signal of electromagnetic field is converted into electric signal by sensor array 4 with 4', carry out amplifying through signal conditioning circuit 5 subsequently, filtering, enter capture card 6 afterwards and carry out A/D conversion, simulating signal is converted into digital signal, finally enter computing machine 7 and carry out signal transacting and show.
Vortex flow loop distribution in metal tube during zero defect as shown in Figure 5.When metal tube 1 is near district with when leaving zero defect in district, dynamic raw vortex flow 9 is uniformly distributed in pipe fitting with 9', now the electromagnetic field signal that picks up of sensor array 4 and 4' without exception.
Vortex flow loop distribution in metal tube during defectiveness as shown in Figure 6.If there is the defects such as crackle in pipe fitting 1, vortex flow loop 9 and 9' will distort at the conducting path of fault location, and form detectable disturbance electromagnetic field at tube surface.The sensor array 4 being arranged in tube surface will pick up the variable signal of this electromagnetic field with 4', thus can realize effective detection of defect.
Claims (10)
1. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow, it is characterized in that: comprise the conveyer (3) transporting metal tube to be detected (1), the DC magnetization coil (2) that metal tube to be detected extends there through, magneto-dependent sensor, signal conditioning circuit (5), capture card (6) and computing machine (7), magneto-dependent sensor, signal conditioning circuit, capture card is connected successively with computing machine, described magneto-dependent sensor is around metal tube to be detected circumference in the close district that dynamic raw vortex flow is concentrated or/and leave in district and arrange, when pick-up unit runs, metal tube to be detected transports through DC magnetization coil by conveyer, the electromagnetic field variation signal of magneto-dependent sensor pickup tube surface, electromagnetic field variation signal is converted into electric signal, electric signal amplifies through signal conditioning circuit, after filtering, A/D conversion is carried out by capture card, be supplied to computing machine and carry out analyzing and processing, obtain the defect information of pipe fitting.
2. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1, it is characterized in that: described magneto-dependent sensor is separately positioned on DC magnetization coil both sides and moves the concentrated close district of raw vortex flow and leave in district, and arrange along metal tube circumference uniform array to be detected.
3. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 2, is characterized in that: the magneto-dependent sensor of arranged in arrays is arranged on DC magnetization coil by support (8).
4. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1 or 2 or 3, is characterized in that: the distance between the end face of described magneto-dependent sensor and metal tube surface to be detected is not more than 2.0mm.
5. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 4, is characterized in that: the distance between the end face of described magneto-dependent sensor and metal tube surface to be detected is 0.5 ~ 1.0mm.
6. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1 or 2 or 3, is characterized in that: the metal tube to be detected that described conveyer makes it transport and DC magnetization coil pass coaxially from DC magnetization coil.
7. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1 or 2 or 3, is characterized in that: described conveyer is " V " type wheel conveyer, and a pair " V " type wheel mechanism is at least respectively arranged on the both sides of DC magnetization coil.
8. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1 or 2 or 3, is characterized in that: the translational speed that described conveyer transports metal tube to be detected is not less than 3 ms/min.
9. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 1 or 2 or 3, is characterized in that: the radial magnetic field intensity that DC magnetization coil produces in magneto-dependent sensor layout area must not lower than 3000A/m.
10. the metal tube electromagnetic nondestructive device based on dynamic raw vortex flow according to claim 8, is characterized in that: the radial magnetic field intensity that DC magnetization coil produces in magneto-dependent sensor layout area must not lower than 3000A/m.
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Cited By (8)
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| CN105806935A (en) * | 2016-05-27 | 2016-07-27 | 三峡大学 | Device for quickly detecting welding seam defects of large metal circular pipelines |
| 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 |
| CN110057904A (en) * | 2019-04-29 | 2019-07-26 | 电子科技大学 | A kind of defect quantitative detection method and device moving metal component |
| CN110108787A (en) * | 2019-05-07 | 2019-08-09 | 电子科技大学 | A kind of rotating metallic component electromagnetic nondestructive device based on dynamic raw vortex |
| CN110542765A (en) * | 2018-05-29 | 2019-12-06 | 纳博特斯克有限公司 | Speed detection device and speed detection method |
| CN112729622A (en) * | 2020-12-17 | 2021-04-30 | 上海电气集团股份有限公司 | Stress nondestructive testing method, device and equipment |
| CN112858466A (en) * | 2021-01-11 | 2021-05-28 | 蒋峰 | Quantitative evaluation method for inner surface cracks of metal pipeline |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110542765A (en) * | 2018-05-29 | 2019-12-06 | 纳博特斯克有限公司 | Speed detection device and speed detection method |
| CN110057904A (en) * | 2019-04-29 | 2019-07-26 | 电子科技大学 | A kind of defect quantitative detection method and device moving metal component |
| 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 |
| CN110108787A (en) * | 2019-05-07 | 2019-08-09 | 电子科技大学 | A kind of rotating metallic component electromagnetic nondestructive device based on dynamic raw vortex |
| CN112729622A (en) * | 2020-12-17 | 2021-04-30 | 上海电气集团股份有限公司 | Stress nondestructive testing method, device and equipment |
| CN112858466A (en) * | 2021-01-11 | 2021-05-28 | 蒋峰 | Quantitative evaluation method for inner surface cracks of metal pipeline |
| 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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