CN104062355B - Eddy current coil center calibrating installation and calibration method - Google Patents
Eddy current coil center calibrating installation and calibration method Download PDFInfo
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- CN104062355B CN104062355B CN201310086877.2A CN201310086877A CN104062355B CN 104062355 B CN104062355 B CN 104062355B CN 201310086877 A CN201310086877 A CN 201310086877A CN 104062355 B CN104062355 B CN 104062355B
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Abstract
Present invention is disclosed a kind of device calibrated for eddy current coil electric centre, it is normal verification sample pipe work for former through mode vortex in use, and a step quite crucial in this work is exactly the electrfic centre of measuring coil and examines the coincidence adjustment at steel pipe mechanical center.The device is, by a kind of method of utilization electromagnetic induction, original first looking for be looked for the two-step method of coil electrfic centre after coil machine center, makes the one-step method of present direct searching coil electrfic centre into.The measurement of electromagnetic induction is changed over by original machinery adjustment.And because employing digital display technique, digitize final result, be conducive to later statistics, reduce labor intensity, improve efficiency.
Description
Technical field
When being used for eddy current inspection verification sample pipe the present invention relates to one kind, it is ensured that coil electrfic centre is consistent with by Tan Wu centers
A kind of calibrating installation and calibration method.
Background technology
Eddy current inspection be the action of alternating magnetic field produced by alternating current in conductive material to be detected a flaw, induce electric whirlpool
Stream.If defective in material, the current vortex produced by interference is formed interference signal by it.Detected with eddy current flaw detec
Its interference signal, it is possible to know the situation of defect.Influence the factor of vortex a lot, that is, abundant signal is loaded with being vortexed, this
A little signals are relevant with the several factors of material, how to separate wherein useful signal one by one from many signals, this
It is the function place of eddy current flaw detec.
The distinguishing feature of eddy current inspection is, with regard to that can work, and to be not necessarily ferromagnetic material to conductive material.Secondly, wait to visit
Finish, flatness, side Jie of workpiece surface etc. have considerable influence to eddy current inspection, therefore eddy current inspection often is used for into shape
The brighter and cleaner workpiece flaw detection in relatively regular, surface.The factor of generally influence eddy current inspection result is a lot, material change, workpiece and inspection
The size of 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 inspection of steel pipe, mostly based on feed-through coil method.
Tube product mainly has the production of the emphasis such as petroleum pipeline, drilling rod, high-pressure boiler tube high added value to the business of eddy current inspection
Product, due to through mode be vortexed it is convenient it is rapid accurate be able on steel tube flaw detection commonly used, add to various external steel pipes lifes
Production standard through mode vortex is also generally used.Using many set through mode vortex equipments to steel pipe in the production line of steel pipe
Flaw detection is carried out to ensure the quality of product, through mode eddy current inspection steel pipe's production in serve conclusive effect.
But the verification of sample pipe every two hours must be carried out with when changing specification using through mode eddy current inspection, to ensure the reliable of flaw detection
Property.Verification sample pipe substantially or uses original based on machine center now, and machine is found by measure geometry size
The difference that disappears of the electrfic centre of tool center, machine center and coil can only be adjusted by rule of thumb, not only consume the substantial amounts of time, and
Completely without fixed pattern, this method very not science, and without repeatability.Strong, the automaticity for such a continuity
Height, the enterprise that production efficiency is directly connected with benefit is unimaginable.
Prior art substantially or uses original based on machine center to verification sample pipe, several by repeated measurement
What size finds machine center, and the difference that disappears of the electrfic centre of machine center and coil can only be adjusted by rule of thumb, individual factor exists
Suitable effect is played in adjustment, due to everyone exist sizable uncertainty to adjust sample pipe time length it is uncontrollable
System, influences rhythm of production.
The content of the invention
The purpose of the present invention aims to provide a kind of eddy current coil center calibrating installation and calibration method, to solve prior art
Present in various deficiencies.
According to the present invention, there is provided a kind of eddy current coil center calibrating installation, including metal tube to be measured and eddy current inspection detection
The detection coil of device, wherein calibrating installation are equivalent to a transformer, the magnet exciting coil of detection coil as transformer primary
Coil, the measuring coil of detection coil as transformer secondary coil, metal tube to be measured as transformer iron core.
According to one embodiment of the invention, in addition to broadband signal amplifier, it is connected with primary coil, wideband is taken a message
The changed power for the magnet exciting coil that the difference that number amplifier adjusts the external diameter of metal tube to be measured and the internal diameter of detection coil is caused.
According to one embodiment of the invention, in addition to variable ratio frequency changer signal generator, it is connected with broadband signal amplifier,
Variable ratio frequency changer signal generator adjusts the frequency of magnet exciting coil.
According to one embodiment of the invention, in addition to signal preamplifier, it is connected with secondary coil.
According to one embodiment of the invention, signal preamplifier is that linear low temperature floats amplifier.
According to one embodiment of the invention, in addition to signal shaper, it is connected with signal preamplifier, signal shaping
Device includes shaping circuit, amplitude limiter circuit and filter circuit.
According to one embodiment of the invention, in addition to display unit, it is connected with signal shaper；Display unit includes mould
Intend gauge outfit and digital watch, analog meter shows the end change of variable quantity, and digital watch shows the total value of variable quantity.
According to another aspect of the present invention, a kind of eddy current coil center calibration method is also provided, eddy current coil is equivalent to
Transformer, comprises the following steps：Step one, it regard the magnet exciting coil of the detection coil of eddy current inspection detector as the first of transformer
Level coil；Step 2, using the measuring coil of the detection coil of eddy current inspection detector as transformer secondary coil；Step
Three, using metal tube to be measured as transformer iron core；Step 4, measures the exporting change of secondary coil, adjustment measuring coil
The machine center of electrfic centre and metal tube to be measured.
According to one embodiment of the invention, in primary side, adjust metal tube to be measured external diameter and detection coil it is interior
The changed power for the magnet exciting coil that the difference in footpath is caused.
According to one embodiment of the invention, in primary side, the frequency of magnet exciting coil is adjusted.
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 amplification, amplitude limit, filter and show.
Technical scheme is employed, the calibration of eddy current coil center is changed over into electromagnetism sense by original machinery adjustment
The measurement answered, the method for adjustment changed over to the concentricity of vortex sample pipe verification, with flaw detection efficiency high, flaw detection operation side
Just, accurately, reduction labor intensity, the advantage raised labour efficiency.The present invention is connected by simple interface, goes for appointing
The center verification of what brand through mode vortex, it can also be used to the adjustment of the fixed center of ferrimagnet, to the tune at other centers
Adjusting method has certain reference function.
Brief description of the drawings
In the present invention, identical reference represents identical feature all the time, wherein：
Fig. 1 is the structure chart of eddy current coil center of the present invention calibrating installation；
Fig. 2 is the structural representation of display unit in Fig. 1.
Embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
The present invention finds machine center for original based on 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, and human factor plays suitable effect in adjustment.
To search out a kind of new more scientific method of adjustment, the present invention develop it is a kind of by detect electromagnetic intensity device with up to
To the coincidence at final hub of a spool and steel pipe center, the verification of sample pipe is quickly finished, final is to be ensured through formula eddy current inspection
Equipment can detect a flaw to normal reliable.
Be this present invention just using detection coil electromagnetic induction characteristic relative with detected steel pipe because detection coil and
Detected workpiece has actually entered to constitute an electromagnetic induction form for being equal to transformer, and detected steel pipe serves change
The iron core T of depressor effect, and the electromagnetic induction between positions and coil of the iron core T in coil plays conclusive effect.
The electromagnetic induction change that change in location of the iron core T in transformer is triggered, will produce the variation phenomenon of electromagnetic intensity,
Phenomenon of the present invention just to electromagnetic intensity change is measured, the problem of finally solving this check and correction center.
The change of electromagnetic induction caused by change in location of the iron core T in coil, causes output to become on the secondary winding
Change is measurable, is regular.Using this rule characteristic, the present invention just directly can quickly make the electrfic centre and steel of coil
The center superposition of pipe, to reach that through mode vortex verifies the concentricity adjustment work of sample pipe.Whole process heads direct for target, right
Operating personnel operate also simpler without very high technical requirements.
Reference picture 1, eddy current coil center calibrating installation of the invention mainly includes variable ratio frequency changer signal generator, wideband and taken a message
Number amplifier, through mode eddy current coil, signal preamplifier, signal shaper and display unit.Wherein, through mode vorticity line
Enclose as the detection coil of eddy current inspection detector, also include metal tube to be measured in detection process in addition, below by taking steel pipe as an example,
But it is not limited with steel pipe, eddy current inspection goes for various metal tubes.
To realize the calibration mesh of eddy current coil electric centre and steel pipe center, make one to treat school eddy current inspection detection line
Enclose the center calibrating installation for measuring coil, calibrating installation of the invention is equivalent to a transformer, wherein detection coil is encouraged
Magnetic coil is as the primary coil of transformer, and the measuring coil of detection coil is used as the secondary coil of transformer, detected steel
Pipe serves the iron core T of transformer effect.
Because the material of visited steel pipe is various in style, and characteristic frequency of every kind of ferromagnetism material in magnetic field is also differed very
Greatly, characteristic frequency influences very large in electromagnetic induction on mutual inductance, is that this present invention customized can be in the range of certain frequency
Continuously adjustable frequency of signal generator, you can frequency variation signal generator, is connected with broadband signal amplifier, variable ratio frequency changer
Signal generator adjusts the frequency of magnet exciting coil, excitation frequency is 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 inspection has the general of fill factor
Read, that is to say, that certain value is necessarily less than by the difference of the external diameter of spy steel pipe and the internal diameter of detection coil, therefore in various steel pipe
Various detection coil has been drawn under specification, and the change of magnet exciting coil size consumes several times of power difference, is this present invention
Matched the need for adapting to so, can be adjusted in the power amplifier of broadband, wide load characteristic using broadband signal amplifier
The changed power for the magnet exciting coil that the difference of the external diameter of metal tube to be measured and the internal diameter of detection coil is caused.
Signal preamplifier is connected with secondary coil, less demanding, the present invention just use of signal preamplifier
The linear low temperature drift amplifier of standard can meet requirement.
Signal shaper, is connected with signal preamplifier, and signal shaper includes shaping circuit, amplitude limiter circuit and filter
Wave circuit, signal must be carried out the processing such as shaping, amplitude limit, filtering to coordinate next stage normally to show.Shaping circuit is
Irregular for input signal carries out shaping by resistance, electric capacity, inductance.Amplitude limiter circuit is the display electricity for next stage
Road is supporting, to enable the output value changes embodied caused by inductance change of display circuit maximum capacity, after being conducive to
The observation of operating personnel, accurately determines adjustment direction, to save adjustment time.Filter circuit is the stabilization for display circuit
And design, to eliminate sign mutation caused by clutter.
Display unit is connected with signal shaper, using analog meter and digital watch and method.Analog meter
For showing that the end of variable quantity changes, make the adjustment by upper level, analog meter is shown whole variable quantity all the time most
Whether part, be conducive to the observation adjustment direction of operative employee correct afterwards.Digital watch shows the total value of whole adjustment change, embodies
Go out the change of coil internal mutual emotion condition, united due to being shown using numeral output beneficial to the foundation and numeral standardized later
Meter.
As shown in Fig. 2 the upper left quarter at display unit interface is the analog meter 1 adjusted for display centre direction, upper right
Side is the digital watch 2 shown for eddy current coil influence value, and right side central is the He of potentiometer 3 adjusted for amplifier gain
The potentiometer 4 of zero-bit adjustment is exported for amplifier, left bottom is the digital watch 5 that display is adjusted for frequency, middle bottom
Portion is the potentiometer 6 adjusted for frequency, and bottom right side is the cable socket 7 connected for eddy current coil, whole display unit
Right side sets power switch 8.
The above-mentioned eddy current coil center calibrating installation of correspondence, invention additionally discloses a kind of calibrating installation using the present invention
Eddy current coil center calibration method, comprises the following steps：
Step one, using the magnet exciting coil of the detection coil of eddy current inspection detector as transformer primary coil.
Step 2, using the measuring coil of the detection coil of eddy current inspection detector as transformer secondary coil.
Step 3, using metal tube to be measured as transformer iron core T.
Step 4, measures the exporting change of secondary coil, adjusts the electrfic centre of measuring coil and the machinery of metal tube to be measured
Center.
The present invention's is primarily present advantages below for eddy current coil electric centre calibrating installation and calibration method：
1. substitute the method that tradition machinery is measured with the principle of measurement electromagnetic induction change.
2. see that result carries out experience after original first mechanical measuring center is substituted with the method for one-shot measurement electromagnetic induction
Two methods of adjustment.
3. doing monitoring using analog meter ensure that the direction of adjustment is towards the work of result direction.
4. follow-up numerical statistic and management are conducive to using the output of digital watch.
5. due to this eddy current coil electric centre calibrate device statistics have shown it is less demanding to operative employee, it is easy to adjust,
Operating efficiency is effectively improved.
Those of ordinary skill in the art is it should be appreciated that the specification of the above is only numerous embodiments of the invention
In one or more of embodiments, and not use limitation of the invention.Any equalization for embodiment described above becomes
The technical schemes such as change, modification and equivalent substitute, as long as meeting the spirit of the present invention, will all fall the power in the present invention
In the range of sharp claim is protected.
Claims (12)
1. a kind of eddy current coil center calibrating installation, includes the detection coil of metal tube to be measured and eddy current inspection detector, it is special
Levy and be：The calibrating installation is equivalent to a transformer, the magnet exciting coil of the detection coil as transformer primary line
Circle, the measuring coil of the detection coil as transformer secondary coil, the metal tube to be measured as transformer iron core.
2. eddy current coil center as claimed in claim 1 calibrating installation, it is characterised in that also including broadband signal amplifier,
It is connected with the primary coil, the broadband signal amplifier adjusts the external diameter and the detection line of the metal tube to be measured
The changed power for the magnet exciting coil that the difference of the internal diameter of circle is caused.
3. eddy current coil center as claimed in claim 2 calibrating installation, it is characterised in that also including variable ratio frequency changer signal generator,
It is connected with the broadband signal amplifier, the variable ratio frequency changer signal generator adjusts the frequency of the magnet exciting coil.
4. eddy current coil center as claimed in claim 1 calibrating installation, it is characterised in that also including signal preamplifier, with
The secondary coil is connected.
5. eddy current coil center as claimed in claim 4 calibrating installation, it is characterised in that the signal preamplifier is line
Property Low Drift Temperature amplifier.
It is and described 6. eddy current coil center as claimed in claim 4 calibrating installation, it is characterised in that also including signal shaper
Signal preamplifier is connected, and the signal shaper includes shaping circuit, amplitude limiter circuit and filter circuit.
7. eddy current coil center as claimed in claim 6 calibrating installation, it is characterised in that also including display unit, with the letter
Number reshaper is connected；The display unit includes analog meter and digital watch, and the analog meter shows the end of variable quantity
End change, the digital watch shows the total value of variable quantity.
8. a kind of eddy current coil center calibration method, it is characterised in that the eddy current coil is equivalent to transformer, including it is following
Step：
Step one, using the magnet exciting coil of the detection coil of eddy current inspection detector as transformer primary coil；
Step 2, using the measuring coil of the detection coil of eddy current inspection detector as transformer secondary coil；
Step 3, using metal tube to be measured as transformer iron core；
Step 4, measures the exporting change of the secondary coil, adjusts the electrfic centre and the metal to be measured of the measuring coil
The machine center of pipe.
9. eddy current coil center as claimed in claim 8 calibration method, it is characterised in that in the primary side, adjustment
The changed power for the magnet exciting coil that the difference of the external diameter of the metal tube to be measured and the internal diameter of the detection coil is caused.
10. eddy current coil center as claimed in claim 8 calibration method, it is characterised in that in the primary side, adjustment
The frequency of the magnet exciting coil.
11. eddy current coil center as claimed in claim 8 calibration method, it is characterised in that in the second coil side, by institute
State the output signal amplification of secondary coil.
12. eddy current coil center as claimed in claim 11 calibration method, it is characterised in that believe the output after the amplification
Number shaping, amplitude limit, filter and show.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310086877.2A CN104062355B (en) | 2013-03-18 | 2013-03-18 | Eddy current coil center calibrating installation and calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310086877.2A CN104062355B (en) | 2013-03-18 | 2013-03-18 | Eddy current coil center calibrating installation and calibration method |
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| Publication Number | Publication Date |
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| CN104062355A CN104062355A (en) | 2014-09-24 |
| CN104062355B true CN104062355B (en) | 2017-08-25 |
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| CN201310086877.2A Active CN104062355B (en) | 2013-03-18 | 2013-03-18 | Eddy current coil center calibrating installation and calibration method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU179359U1 (en) * | 2017-11-24 | 2018-05-11 | Дмитрий Сергеевич Крюков | Eddy Current Transmitter |
| CN109975632B (en) * | 2019-03-01 | 2022-02-18 | 上海纪岩电力科技有限公司 | Device for detecting loss degree of eddy current detector |
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100838A (en) * | 1985-04-01 | 1986-07-09 | 合肥工业大学 | Off-centre detector for welding eletrode with differential transformer |
| JPH02212761A (en) * | 1989-02-13 | 1990-08-23 | Sumitomo Metal Ind Ltd | Eddy flaw detector |
| US5793205A (en) * | 1996-03-14 | 1998-08-11 | Framatome Technologies, Inc. | Coil and guide system for eddy current examination of pipe |
| CN201488978U (en) * | 2009-08-13 | 2010-05-26 | 宝山钢铁股份有限公司 | Testing system of eddy current coil electric centre |
| CN201540280U (en) * | 2009-11-25 | 2010-08-04 | 中国石油大学(华东) | Device for online detection of pumping rod of exterior penetration type eddy current sensor |
| JP2011128022A (en) * | 2009-12-17 | 2011-06-30 | Sumitomo Metal Ind Ltd | Eddy current flaw test device |
| CN102661996B (en) * | 2012-05-04 | 2014-10-29 | 中国矿业大学 | Method and device for testing parameters of metal pipe fitting with electric eddy under the eccentric state of probe |
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