CN104062355A - Eddy current coil center calibrating device and calibrating method - Google Patents
Eddy current coil center calibrating device and calibrating method Download PDFInfo
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- CN104062355A CN104062355A CN201310086877.2A CN201310086877A CN104062355A CN 104062355 A CN104062355 A CN 104062355A CN 201310086877 A CN201310086877 A CN 201310086877A CN 104062355 A CN104062355 A CN 104062355A
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Abstract
The invention provides an eddy current coil center calibrating device. The eddy current coil center calibrating device is directed at normal sample pipe verification of traditional feed-through eddy currents in use, and during normal sample pipe verification, a key step is superposition and adjusting of the electric centre of a measuring coil and a mechanical center for steel pipe examination. The device employs an electromagnetic induction method and changes a traditional two-step method of finding the mechanical center of a coil at first and the electric centre of the coil next into a one-step method of directly finding the electric centre of the coil, so original mechanical adjustment is changed into electromagnetic induction measurement. According to the invention, since digital display technology is employed, final results are digitalized, which is beneficial for subsequent statistics; and thus, labor intensity is mitigated and labor efficiency is improved.
Description
Technical field
While the present invention relates to one for eddy current test verification sample pipe, guarantee a kind of calibrating installation and calibration steps that coil electrfic centre Yu Beitanwu center is consistent.
Background technology
Eddy current test be the action of alternating magnetic field that produced by alternating current in conductive material to be detected a flaw, induce current vortex.If defectiveness in material, it,, by disturbing the current vortex producing, forms undesired signal.Detect its undesired signal with eddy current flaw detec, just can know the situation of defect.The factor that affects eddy current is a lot, in eddy current, is loaded with abundant signal, and these signals are relevant with the several factors of material, how wherein useful signal is separated one by one from many signals, and this is the function place of eddy current flaw detec.
The distinguishing feature of eddy current test is just can work to conductive material, and ferromagnetic material not necessarily.Secondly, the smooth finish of surface of the work to be visited, flatness, Bian Jie etc. have considerable influence to eddy current test, and therefore often workpiece eddy current test is more regular for shape, that surface is brighter and cleaner is detected a flaw.Conventionally the factor that affects eddy current test result is a lot, and the size of material variation, workpiece and magnetic test coil, the shape of defect and present position, flaw detection condition etc., all affect the correct evaluation to result of detection.In the eddy current test of steel pipe, be main mainly with feed-through coil method greatly.
Tube product mainly contains the emphasis high value added products such as petroleum pipeline, drilling rod, high-pressure boiler tube to the business of eddy current test, because the convenient of through mode eddy current accurately generally applied rapidly on steel tube flaw detection, add to various external steel pipe's production standard through mode eddy current and also generally adopted.In the production line of steel pipe, adopted many cover through mode vortex equipments to carry out flaw detection to guarantee the quality of product to steel pipe, through mode eddy current test steel pipe's production in played conclusive effect.But while using through mode eddy current test every two hours with replacing specification, must carry out the verification of sample pipe, to guarantee the reliability of flaw detection.Verification sample pipe still adopts now original taking machine center as basis substantially, find machine center by measure geometry size, the difference that disappears of the electrfic centre of machine center and coil can only be adjusted by rule of thumb, not only to consume a large amount of time, and there is no fixed pattern completely, very science not of this method, and do not there is repeatability.Strong for such continuity, automaticity is high, and the enterprise that production efficiency is directly connected with benefit is unimaginable.
Prior art still adopts original taking machine center as basis substantially to verification sample pipe, find machine center by repeated measurement physical dimension, the difference that disappears of the electrfic centre of machine center and coil can only be adjusted by rule of thumb, individual factor plays suitable effect in adjustment, because everyone exists sizable uncertainty uncontrollable to the time length of adjustment sample pipe, affect rhythm of production.
Summary of the invention
Object of the present invention aims to provide a kind of eddy current coil calibrate device and calibration steps, solves the various deficiencies that exist in prior art.
According to the present invention, a kind of eddy current coil calibrate device is provided, comprise the magnetic test coil of metal tube to be measured and eddy current test detecting device, wherein calibrating installation is equivalent to a transformer, the field coil of magnetic test coil is as the primary coil of transformer, the measuring coil of magnetic test coil is as the secondary coil of transformer, and metal tube to be measured is as the iron core of transformer.
According to one embodiment of the invention, also comprise broadband signal amplifier, be connected with primary coil, the power that broadband signal amplifier is adjusted the field coil that the difference of the external diameter of metal tube to be measured and the internal diameter of magnetic test coil causes changes.
According to one embodiment of the invention, also comprise variable ratio frequency changer signal generator, be connected with broadband signal amplifier, variable ratio frequency changer signal generator is adjusted the frequency of field coil.
According to one embodiment of the invention, also comprise signal preamplifier, be connected with secondary coil.
According to one embodiment of the invention, signal preamplifier is linear Low Drift Temperature amplifier.
According to one embodiment of the invention, also comprise signal shaper, be connected with signal preamplifier, signal shaper comprises shaping circuit, amplitude limiter circuit and filtering circuit.
According to one embodiment of the invention, also comprise display unit, be connected with signal shaper; Display unit comprises analog meter and digital watch, and analog meter shows that the end of variable quantity changes, and digital watch shows the total value of variable quantity.
According to a further aspect in the invention, also provide a kind of eddy current coil calibrate method, eddy current coil is equivalent to transformer, comprise the following steps: step 1, the primary coil using the field coil of the magnetic test coil of eddy current test detecting device as transformer; Step 2, the secondary coil using the measuring coil of the magnetic test coil of eddy current test detecting device as transformer; Step 3, the iron core using metal tube to be measured as transformer; Step 4, the exporting change of measurement secondary coil, adjusts the electrfic centre of measuring coil and the machine center of metal tube to be measured.
According to one embodiment of the invention, in primary side, the power of adjusting the field coil that the difference of the external diameter of metal tube to be measured and the internal diameter of magnetic test coil causes changes.
According to one embodiment of the invention, in primary side, adjust the frequency of field coil.
According to one embodiment of the invention, in second coil side, the output signal of secondary coil is amplified.
According to one embodiment of the invention, by the output signal shaping after amplifying, amplitude limit, filtering demonstration.
Adopt technical scheme of the present invention, eddy current coil calibrate is changed over to the measurement of electromagnetic induction by original machinery adjustment, change the method for adjustment of the concentricity of past to the verification of eddy current sample pipe, have flaw detection efficiency high, detect a flaw easy to operate, accurate, reduce labour intensity, the advantage of raising labour efficiency.The present invention connects by simple interface, goes for the center verification of any brand through mode eddy current, also can be used for the adjustment of the dead center of ferrimagnet, and the method for adjustment at other centers is had to certain reference function.
Brief description of the drawings
In the present invention, identical Reference numeral represents identical feature all the time, wherein:
Fig. 1 is the structural drawing of eddy current coil calibrate device of the present invention;
Fig. 2 is the structural representation of display unit in Fig. 1.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with drawings and Examples.
The present invention is directed to and original find machine center taking machine center as basis by repeated measurement physical dimension, the difference that disappears of the electrfic centre of machine center and coil can only be adjusted by rule of thumb, and human factor plays suitable effect in adjustment.For searching out a kind of new more scientific method of adjustment, the present invention has developed a kind of by detecting electromagnetic intensity device to reach the coincidence at final hub of a spool and steel pipe center, complete fast the verification of sample pipe, finally for guaranteeing that through mode eddy current inspection equipment can detect a flaw to normal reliable.
The present invention just utilizes the electromagnetic induction characteristic that magnetic test coil is relative with detected steel pipe for this reason, because magnetic test coil and detected workpiece have entered to form an electromagnetic induction form that is equal to transformer in fact, detected steel pipe has played the effect of the iron core T of transformer, and electromagnetic induction between position and the coil of iron core T in coil plays conclusive effect.The electromagnetic induction that the change in location of iron core T in transformer causes changes, and will produce the variation phenomenon of electromagnetic intensity, and the phenomenon that the present invention just changes electromagnetic intensity is measured, and finally solves the problem at this check and correction center.
The variation of the change in location caused electromagnetic induction of iron core T in coil, causes that on secondary coil exporting change is measurable, is regular.Utilize the present invention of this rule characteristic just can directly make fast the electrfic centre of coil and the center superposition of steel pipe, to reach the concentricity adjustment work of through mode eddy current verification sample pipe.Whole process is headed direct for target, and operating personnel are not had to very high technical requirement, operates also simpler.
With reference to Fig. 1, eddy current coil calibrate device of the present invention mainly comprises variable ratio frequency changer signal generator, broadband signal amplifier, through mode eddy current coil, signal preamplifier, signal shaper and display unit.Wherein, through mode eddy current coil is the magnetic test coil of eddy current test detecting device, also comprises in addition and metal tube to be measured below taking steel pipe as example, but be not limited with steel pipe in testing process, and eddy current test goes for various metal tubes.
For realizing the calibration order ground at eddy current coil electric centre and steel pipe center, make one to treat the calibrate device of eddy current test magnetic test coil in school as measuring coil, calibrating installation of the present invention is equivalent to a transformer, wherein the field coil of magnetic test coil is as the primary coil of transformer, the measuring coil of magnetic test coil is as the secondary coil of transformer, and detected steel pipe has played the effect of the iron core T of transformer.
Because the material of the steel pipe of visiting is various in style, and every kind of ferromagnetism material characteristic frequency in magnetic field also differs greatly, characteristic frequency is very big on mutual inductance impact in electromagnetic induction, for this reason the present invention customized can be within the scope of certain frequency continuous adjustable frequency of signal generator, get final product frequency variation signal generator, be connected with broadband signal amplifier, variable ratio frequency changer signal generator is adjusted the frequency of field coil, excitation frequency can be operated in the characteristic frequency of certain material, to obtain maximum mutual inductance effect.
Broadband signal amplifier is connected with primary coil, because through mode eddy current test has the concept of an activity coefficient, that is to say that the difference of being visited the external diameter of steel pipe and the internal diameter of magnetic test coil must be less than certain value, therefore under various steel pipe specification, drawn various magnetic test coil, and the variation consumed power of field coil size differs several times, matched can be in broadband in the present invention for this reason, the power amplifier of wide load characteristic adapts to such needs, the power of the field coil that the difference of utilizing broadband signal amplifier to adjust the external diameter of metal tube to be measured and the internal diameter of magnetic test coil causes changes.
Signal preamplifier is connected with secondary coil, signal preamplifier less demanding, and the present invention has just adopted the linear Low Drift Temperature amplifier of standard can meet the demands.
Signal shaper, is connected with signal preamplifier, and signal shaper comprises shaping circuit, amplitude limiter circuit and filtering circuit, signal must be carried out to the processing such as shaping, amplitude limit, filtering in order to coordinate next stage normally to show.Shaping circuit is irregular by the shaping of carrying out of resistance, electric capacity, inductance for input signal.Amplitude limiter circuit is supporting for the display circuit of next stage, and for the inductance that embodies that makes display circuit energy maximum capacity changes caused output valve variation, operating personnel's observation after being conducive to, determines and adjust direction accurately, to save the adjustment time.Filtering circuit is to design for the stable of display circuit the sign mutation causing to eliminate clutter.
Display unit is connected with signal shaper, adopts the method for analog meter and digital watch use.Analog meter changes for the end that shows variable quantity, makes the adjustment by upper level, makes analog meter show all the time the decline of whole variable quantity, and whether the observation adjustment direction that is conducive to operative employee is correct.Digital watch shows the total value that whole adjustment changes, and embodies the variation of coil inside mutual inductance situation, due to standardized foundation and statistics after adopting digital output display to be conducive to.
As shown in Figure 2, the upper left quarter at display unit interface is the analog meter 1 of adjusting for display centre direction, upper right side is the digital watch 2 showing for eddy current coil influence value, right side central is the potentiometer 3 of adjusting for amplifier gain and the potentiometer 4 of adjusting for amplifier output zero-bit, left bottom is the digital watch 5 showing for frequency adjustment, central bottom is the potentiometer 6 of adjusting for frequency, bottom, right side is the cable socket 7 connecting for eddy current coil, and whole display unit right side arranges power switch 8.
Corresponding above-mentioned eddy current coil calibrate device, the present invention also discloses a kind of eddy current coil calibrate method of utilizing calibrating installation of the present invention, comprises the following steps:
Step 1, the primary coil using the field coil of the magnetic test coil of eddy current test detecting device as transformer.
Step 2, the secondary coil using the measuring coil of the magnetic test coil of eddy current test detecting device as transformer.
Step 3, the iron core T using metal tube to be measured as transformer.
Step 4, the exporting change of measurement secondary coil, adjusts the electrfic centre of measuring coil and the machine center of metal tube to be measured.
Of the present inventionly mainly there is following advantage for eddy current coil electric centre calibrating installation and calibration steps:
1. substitute the method for traditional mechanical measurement by the principle of measuring electromagnetic induction variation.
2. substitute and see that result carries out two methods of experience adjustments after the mechanical measuring center of original elder generation by the method for one-shot measurement electromagnetic induction.
3. adopt analog meter to do supervision and ensured that the direction of adjusting is towards the work of result direction.
4. adopt the output of digital watch to be conducive to follow-up numerical statistic and management.
5. the device of calibrating due to this eddy current coil electric centre statistics have shown to operative employee less demanding, easy to adjust, and work efficiency effectively improves.
Those of ordinary skill in the art will be appreciated that, above instructions is only one or more embodiments in the numerous embodiment of the present invention, and not uses limitation of the invention.Any equalization variation, modification for the above embodiment and be equal to the technical schemes such as alternative, as long as connotation scope according to the invention, all will drop in the scope that claims of the present invention protect.
Claims (12)
1. an eddy current coil calibrate device, comprise the magnetic test coil of metal tube to be measured and eddy current test detecting device, it is characterized in that: described calibrating installation is equivalent to a transformer, the field coil of described magnetic test coil is as the primary coil of transformer, the measuring coil of described magnetic test coil is as the secondary coil of transformer, and described metal tube to be measured is as the iron core of transformer.
2. eddy current coil calibrate device as claimed in claim 1, characterized by further comprising broadband signal amplifier, be connected with described primary coil, the power of the field coil that the difference of the described broadband signal amplifier adjustment external diameter of described metal tube to be measured and the internal diameter of described magnetic test coil causes changes.
3. eddy current coil calibrate device as claimed in claim 2, characterized by further comprising variable ratio frequency changer signal generator, is connected with described broadband signal amplifier, and described variable ratio frequency changer signal generator is adjusted the frequency of described field coil.
4. eddy current coil calibrate device as claimed in claim 1, characterized by further comprising signal preamplifier, is connected with described secondary coil.
5. eddy current coil calibrate device as claimed in claim 4, is characterized in that described signal preamplifier is linear Low Drift Temperature amplifier.
6. eddy current coil calibrate device as claimed in claim 4, characterized by further comprising signal shaper, is connected with described signal preamplifier, and described signal shaper comprises shaping circuit, amplitude limiter circuit and filtering circuit.
7. eddy current coil calibrate device as claimed in claim 6, characterized by further comprising display unit, is connected with described signal shaper; Described display unit comprises analog meter and digital watch, and described analog meter shows that the end of variable quantity changes, and described digital watch shows the total value of variable quantity.
8. an eddy current coil calibrate method, is characterized in that, described eddy current coil is equivalent to transformer, comprises the following steps:
Step 1, the primary coil using the field coil of the magnetic test coil of eddy current test detecting device as transformer;
Step 2, the secondary coil using the measuring coil of the magnetic test coil of eddy current test detecting device as transformer;
Step 3, the iron core using metal tube to be measured as transformer;
Step 4, measures the exporting change of described secondary coil, adjusts the electrfic centre of described measuring coil and the machine center of described metal tube to be measured.
9. eddy current coil calibrate method as claimed in claim 8, is characterized in that, in described primary side, the power of adjusting the field coil that the difference of the external diameter of described metal tube to be measured and the internal diameter of described magnetic test coil causes changes.
10. eddy current coil calibrate method as claimed in claim 8, is characterized in that, in described primary side, adjusts the frequency of described field coil.
11. eddy current coil calibrate methods as claimed in claim 8, is characterized in that, in described second coil side, the output signal of described secondary coil are amplified.
12. eddy current coil calibrate methods as claimed in claim 11, is characterized in that, by the output signal shaping after described amplification, amplitude limit, filtering demonstration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310086877.2A CN104062355B (en) | 2013-03-18 | 2013-03-18 | Eddy current coil center calibrating installation and calibration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310086877.2A CN104062355B (en) | 2013-03-18 | 2013-03-18 | Eddy current coil center calibrating installation and calibration method |
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| CN104062355A true CN104062355A (en) | 2014-09-24 |
| CN104062355B CN104062355B (en) | 2017-08-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU179359U1 (en) * | 2017-11-24 | 2018-05-11 | Дмитрий Сергеевич Крюков | Eddy Current Transmitter |
| CN109975632A (en) * | 2019-03-01 | 2019-07-05 | 南京维格无损检测有限公司 | A kind of device detecting eddy current testing instrument extent of deterioration |
| CN111693185A (en) * | 2020-07-27 | 2020-09-22 | 广州特种机电设备检测研究院 | Crane wheel pressure testing device and method based on coercive force |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU179359U1 (en) * | 2017-11-24 | 2018-05-11 | Дмитрий Сергеевич Крюков | Eddy Current Transmitter |
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| CN111693185A (en) * | 2020-07-27 | 2020-09-22 | 广州特种机电设备检测研究院 | Crane wheel pressure testing device and method based on coercive force |
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| Publication number | Publication date |
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| CN104062355B (en) | 2017-08-25 |
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