CN202018442U - Nondestructive detecting system for pulsed magnetic flux leakage defect and stress - Google Patents
Nondestructive detecting system for pulsed magnetic flux leakage defect and stress Download PDFInfo
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- CN202018442U CN202018442U CN2011200767890U CN201120076789U CN202018442U CN 202018442 U CN202018442 U CN 202018442U CN 2011200767890 U CN2011200767890 U CN 2011200767890U CN 201120076789 U CN201120076789 U CN 201120076789U CN 202018442 U CN202018442 U CN 202018442U
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Abstract
The utility model relates to a nondestructive detecting system for pulsed magnetic flux leakage defect and stress and belongs to the field of nondestructive detection. The system comprises a signal generator, a power amplifier, an excitation coil, a Hall sensor, a signal amplifier circuit, a data acquisition card and a computer. In the utility mode, based on pulsed magnetic flux leakage detection, staged signal treatment of a ferro magnetic material is performed in two stages, namely pulsed excitation instant rise stage and an after-rise constant high-level stage, so that a stress signal is separated from a defect signal; then signal characteristic extraction and data fusion are performed respectively; and thus, the synchronous online detection of the surface and sub-surface defects and stress and micro structure conditions of the ferro magnetic material are realized, and the hidden defect identification and estimation of unformed defects of the ferro magnetic material can be realized. The system can work reliably for a long time, has high sensitivity, high interference resistance, high response speed and insusceptibility to pollution by oil, water and other media.
Description
Technical field
The utility model relates to the Non-Destructive Testing field, relates in particular to according to pulse excitation signal realization defective to separate with stress signal, realizes the nondestructive detection system of ferrimagnet defective and stress.
Background technology
The Magnetic Flux Leakage Inspecting technology is a kind of important method of ferrimagnet nondestructive evaluations such as pipeline.The growth that increases, manages age along with pipeline, the pipeline leakage pipeline incident that causes owing to reasons such as burn into wearing and tearing, accidental injuries takes place frequently, and be on the rise since the danger and the contaminative of defeated medium, can cause huge life and property loss and environmental pollution in case have an accident.The pipeline online measuring technique is that to be most widely used at present also be the most effective method for detecting pipeline, it utilizes flaw detection principles such as leakage field, ultrasound wave, ray, under the situation that does not influence ordinary production, walk in pipeline by intelligent detector, to the tube wall of oil and gas pipes or the defective of coating: as distortion, damage, burn into perforation, tube wall weightlessness and variation in thickness etc., carry out online detection and analysis, to obtain to detect accurately and reliably data.The Magnetic Flux Leakage Inspecting technology is compared with the X ray detection technique, to the radiationless harm of human body, can work under rugged surroundings, and equipment price is more cheap, and the technical merit of test operation requires also lower; Compare with ultrasonic detection technology, need not to use couplant.The pulse leakage detection technique is a kind of novel Magnetic Flux Leakage Inspecting technology, can be used for detection by quantitative is carried out on surface and nearly surface crack.Because it adopts pulse as pumping signal, contains very wide frequency spectrum in the pumping signal, therefore only need single pass just can detect the crackle of different depth on the test specimen.
In order to obtain the complete pipeline configuration health detection and the information needed of life estimation, except need the defective that have in the structure being detected and assess, another important parameter that need obtain is suffered stress state of structure and microstructure state.Traditional Magnetic Flux Leakage Inspecting theoretical foundation is to be magnetized under the ferrimagnet outside magnetic field inductive action, at the fault in material place,, cause the magnetic line of force to bend because magnetic permeability changes, the part magnetic line of force leaks out material surface and forms leakage field, generally is used for the detection of defective.Adopt the pulse leakage detection technique, because pulse can form alternating magnetic fields in pipeline, therefore, the pulse leakage detection technique can form eddy current in pipeline.By the wide variety of materials stretching experiment, the relation during loading between ess-strain and eddy current signal shows that in the elastic range, eddy current signal and ess-strain have the better linearity relation.Therefore adopt the pulse leakage detection technique can effectively detect defect of pipeline and stress,, adopt signal separation techniques, magnetic leakage signal is separated with eddy current signal, realize the recessive defective and the life appraisal of pipeline according to the ascent stage and the high level stage of pulse signal.
The utility model content
At the existing method of utilizing the Magnetic Flux Leakage Inspecting technology test signal to be adopted steady-state analysis, make signal be left in the basket at some important informations of time domain, and can only detect defect of pipeline, can not detect pipe stress, can not realize problem that the life-span of pipeline is assessed, the applicant has carried out improving research, provides a kind of pulse leakage technology of utilizing to carry out Non-Destructive Testing, reaches defect of pipeline is carried out quantitatively and the pulse leakage defective of life appraisal and the nondestructive detection system of stress.
The technical solution of the utility model is as follows:
The nondestructive detection system of a kind of pulse leakage defective and stress comprises signal generator, power amplifier, drive coil, Hall element, signal amplification circuit, data collecting card and computing machine; Wherein the output terminal of signal generator is divided into two-way, wherein one tunnel output connects the input end of power amplifier, the output of power amplifier connects the drive coil that is wound on the iron core, Hall element places in the middle of the drive coil, Hall element and drive coil and iron core are formed probe and are placed on the test specimen, the output of Hall element connects data collecting card through signal amplification circuit, and another road output of signal generator directly connects data collecting card, and the output of data collecting card connects computing machine.
Useful technique effect of the present utility model is:
The utility model is at ferrimagnet (as pipeline etc.), utilize the characteristics of excitation pulse signal, it is two stages of pulse ascent stage and high level, merged the advantage of eddy-current technique and leakage field technology, eddy-current technique is combined with the leakage field technology, two different phases by pulse signal, eddy current signal is separated with magnetic leakage signal, wherein, eddy current signal can effectively be assessed the stress state of pipeline, magnetic leakage signal can realize the qualitative assessment of defective, thereby apply pulse Magnetic Flux Leakage Inspecting technology not only can detect the size of pipeline crack, can also detect the stress state of pipeline.Therefore this system can detection by quantitative goes out the crackle of pipeline configuration different depth, can detect the stress and the unrelieved stress of pipeline simultaneously, can predict pipeline early.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is the power amplification circuit schematic diagram.
Fig. 3 is the signal amplification circuit schematic diagram.
Description of reference numerals among Fig. 1: 1, signal generator; 2, power amplification circuit; 3, drive coil; 4, Hall element; 5, signal amplification circuit; 6, data collecting card; 7, computing machine.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
As shown in Figure 1, the utility model comprises signal generator 1, power amplification circuit 2, drive coil 3, Hall element 4, signal amplification circuit 5, data collecting card 6 and computing machine 7, wherein the output of signal generator 1 divides two-way to link to each other, one the road is connected in the input of power amplification circuit 2, the output of power amplification circuit 2 is connected in the drive coil 3 that is wound on the iron core, and the output of Hall element 4 is connected in the input of data collecting card through signal amplification circuit 5; Another road directly links to each other with data collecting card 6.Two paths of signals enters computing machine 7 by data collecting card 6, utilizes the powerful data-handling capacities of computing machine 7 to realize separating of eddy current signal and magnetic leakage signal, reaches the recessive defective of pipeline and the purpose of life appraisal.
The concrete course of work of the present utility model is: (a) signal generator 1 produces the adjustable pulse voltage of pulsewidth of certain frequency, and this voltage drives drive coil 3 through power amplifier 2; (b) according to the characteristics of pulse signal, signal is divided into ascent stage and two stages of high level; (c) in the ascent stage, utilize the detection principle of eddy current, the instantaneous upward up voltage that is applied to drive coil 3 two ends can generate eddy current and propagate in tested pipeline, because eddy current signal and ess-strain have the better linearity relation, just comprises the stress state information of pipeline in this eddy current signal of inducting; Hall element 4 picks up this signal, by signal amplification circuit 5 this signal is amplified; The signal that data collecting card 6 is gathered after amplifying enters computing machine 7; (d) pulse excitation signal enters the high level stage after the ascent stage, this high level is a stable voltage, and constant thus high level signal produces permanent magnetic field at drive coil 3 two ends, if there is defective in the pipeline, this perseverance magnetic field will spill from fault location, and Hall element 4 picks up this magnetic leakage signal; This magnetic leakage signal enters computing machine 7 after by signal amplification circuit 5 and data collecting card 6.(e) pulse signal that produces by signal generator 1 directly enters data collecting card 6 on the other hand, and this signal carries out signal subsection as the benchmark of block signal in order to give the signal after amplifying.(f) utilizing the powerful data-handling capacity of computing machine 7, is eddy current signal and magnetic leakage signal by the second road signal subsection signal with first via Signal Separation, extracts by signal characteristic respectively; (g) computing machine 7 shows stress and unrelieved stress size, defect size with graphic form, realizes the recessive defective of pipeline and the assessment in life-span.
The frequency of signal generator 1 can be in the scope of 2 ~ 100MHz among Fig. 1, power amplifier 2 as shown in Figure 2, power amplifier chip LM1875 has five pins, No. one, No. two pin is a signal input part, No. three pins connect negative voltage, No. five pins connect positive voltage, the signal after No. four the pin output power is amplified.Two input ends of signal after the power amplification and drive coil 3 join, and are used to drive drive coil 3.Hall element 4 receives the voltage signal that changes, and this signal is through signal amplification circuit 5 outputs, and signal amplification circuit 5 as shown in Figure 3.Data collecting card 6 is gathered this signal, enters computing machine 7 at last.Computing machine 7 record data also deposit in the form of file, then data are handled, at last with shape and size, the stress of test specimen and the size of unrelieved stress of the form display defect of figure.
The circuit working principle is as follows: after energising, computer run aims at the native system written program, and behind the click computer program start button, system starts working.Signal generator 1 produces the square-wave voltage of certain frequency, drives drive coil 3 through power amplification circuit 2, because the pulse voltage signal that produces is divided into 0 to the instantaneous voltage between high level and two sections voltage signals of high level.In the instantaneous voltage stage, on test specimen, generate instantaneous eddy current by the momentary current that produces in the drive coil 3, and in pipeline material, propagate in the lump with the magnetic-pulse of quick decay, form the induction field of a decay, 4 of Hall elements detect a series of voltage-time signals, this signal amplifies output by signal amplification circuit 5, and data collecting card 6 is gathered this signal, sends computing machine 7 to; Pulse voltage enters the constant high level stage after the instantaneous ascent stage, this high level stage produces constant magnetic field in drive coil 3, if defectiveness exists in the pipeline test specimen, field signal will spill by fault location, Hall element 4 will detect this field signal, this signal enters computing machine 7 through behind the amplifying circuit 5 by data collecting card 6 collections.The square-wave voltage on another road that signal generator 1 produces directly enters computing machine 7 by data collecting card 6, as the benchmark of block signal.Computing machine 7 record data also deposit in the form of file, then data are handled, at last with the stress and the unrelieved stress size of the shape of the form display defect of figure and size, tested pipeline test specimen.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present utility model and design, all should think to be included within the protection domain of the present utility model.
Claims (1)
1. the nondestructive detection system of pulse leakage defective and stress is characterized in that: comprise signal generator (1), power amplifier (2), drive coil (3), Hall element (4), signal amplification circuit (5), data collecting card (6) and computing machine (7); Wherein the output terminal of signal generator (1) is divided into two-way, wherein one tunnel output connects the input end of power amplifier (2), the output of power amplifier (2) connects the drive coil (3) that is wound on the iron core, Hall element (4) places in the middle of the drive coil (3), Hall element (4) is formed probe with drive coil (3) and iron core and is placed on the test specimen, the output of Hall element (4) connects data collecting card (6) through signal amplification circuit (5), another road output of signal generator (1) directly connects data collecting card (6), and the output of data collecting card (6) connects computing machine (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200767890U CN202018442U (en) | 2011-03-22 | 2011-03-22 | Nondestructive detecting system for pulsed magnetic flux leakage defect and stress |
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| CN2011200767890U CN202018442U (en) | 2011-03-22 | 2011-03-22 | Nondestructive detecting system for pulsed magnetic flux leakage defect and stress |
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| CN202018442U true CN202018442U (en) | 2011-10-26 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182933A (en) * | 2011-03-22 | 2011-09-14 | 江南大学 | Nondestructive detection system and method for pulsed magnetic flux leakage defects and stresses |
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN105021693A (en) * | 2015-07-07 | 2015-11-04 | 中国石油大学(华东) | Whole-circumferential electromagnetic field based system for on-line quantitative detection of steel pipe crack |
| CN106124612A (en) * | 2016-06-28 | 2016-11-16 | 中国计量大学 | A kind of Portable ferromagnetic fault in material based on low frequency electromagnetic detection device |
| CN109856242A (en) * | 2019-01-23 | 2019-06-07 | 中国计量大学 | Combination of ultrasound leakage field ferrimagnet defect detecting system |
| CN111458400A (en) * | 2020-04-09 | 2020-07-28 | 中北大学 | Metal material defect detection system based on electromagnetic induction |
| CN112903162A (en) * | 2021-01-20 | 2021-06-04 | 中国石油大学(华东) | Method for evaluating residual stress distribution characteristics of natural gas pipeline circumferential weld by using coercive force |
-
2011
- 2011-03-22 CN CN2011200767890U patent/CN202018442U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182933A (en) * | 2011-03-22 | 2011-09-14 | 江南大学 | Nondestructive detection system and method for pulsed magnetic flux leakage defects and stresses |
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN105021693A (en) * | 2015-07-07 | 2015-11-04 | 中国石油大学(华东) | Whole-circumferential electromagnetic field based system for on-line quantitative detection of steel pipe crack |
| CN105021693B (en) * | 2015-07-07 | 2017-02-15 | 中国石油大学(华东) | Whole-circumferential electromagnetic field based system for on-line quantitative detection of steel pipe crack |
| CN106124612A (en) * | 2016-06-28 | 2016-11-16 | 中国计量大学 | A kind of Portable ferromagnetic fault in material based on low frequency electromagnetic detection device |
| CN109856242A (en) * | 2019-01-23 | 2019-06-07 | 中国计量大学 | Combination of ultrasound leakage field ferrimagnet defect detecting system |
| CN109856242B (en) * | 2019-01-23 | 2023-10-20 | 中国计量大学 | Ultrasonic combined leakage magnet magnetic material defect detection system |
| CN111458400A (en) * | 2020-04-09 | 2020-07-28 | 中北大学 | Metal material defect detection system based on electromagnetic induction |
| CN112903162A (en) * | 2021-01-20 | 2021-06-04 | 中国石油大学(华东) | Method for evaluating residual stress distribution characteristics of natural gas pipeline circumferential weld by using coercive force |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20120322 |