CN102967256B - Pulse eddy current probe for pipeline - Google Patents
Pulse eddy current probe for pipeline Download PDFInfo
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- CN102967256B CN102967256B CN201210472563.1A CN201210472563A CN102967256B CN 102967256 B CN102967256 B CN 102967256B CN 201210472563 A CN201210472563 A CN 201210472563A CN 102967256 B CN102967256 B CN 102967256B
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- pipeline
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- eddy current
- end cap
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Abstract
The invention discloses a kind of pulse eddy current probe for pipeline, comprising: base, it is the cylindrical shell of upper end open lower end closed, and openend is provided with end cap, and base is coaxially arranged on the bottom of shell; Guidepost, is arranged on end cap, guidepost is socketed with spring, and spring one end is connected on end cap, and the other end abuts with shell upper end; Drive coil and receiving coil, be nested inside and outside it bottom be arranged on coaxially in base, and the internal diameter of receiving coil is greater than the external diameter of drive coil; During detection, outer casing bottom is placed on pipeline outer wall, and base contacts with pipeline outer wall, and drive coil produces the Primary field of transition, makes tested region respond to transition eddy current thus produces secondary magnetic field, and being received by receiving coil, can record the wall thickness in tested region.The present invention can realize probe and the automatic centering of pipeline in testing process, effectively can improve detection efficiency, overcomes existing pulse eddy current probe in testing process because of signal fluctuation that is eccentric and that rock and cause.
Description
Technical field
The invention belongs to electromagnetic nondestructive device, particularly a kind of pick-up unit thinning for pipeline wall thickness.
Background technology
Pipeline is widely used in the industry such as petrochemical industry, electric power, by corroding or corroding the wall thickness reduction caused, serious threat is constituted to its reliability and security, need periodic detection, and take appropriate measures, to ensure pipe safety and reliably to run according to the wall thickness reduction amount detecting gained.Pulsed eddy current testing technology is fast with its speed, security good, low cost and other advantages becomes one of one preferred technique of testing pipes wall thickness reduction in recent years.
Square wave current is loaded on drive coil by Pulsed eddy current testing technology, the Primary field produced acts on the tested region of test specimen, when electric current generation transition, Primary field is transition thereupon also, according to the law of electromagnetic induction, transition eddy current will be induced in tested region, its rate of decay is relevant with the wall thickness in tested region, because the eddy current difficulty in direct-detection test specimen is very large, generally calculate the wall thickness in tested region by detecting the secondary magnetic field produced by eddy current, thus realize the quantitative detection to test specimen wall thickness reduction.By drive coil together with being used for detecting the component encapsulation of secondary magnetic field, just define pulse eddy current probe.
The typical structure of existing pulse eddy current probe as shown in Figure 3, form primarily of drive coil 12 and receiving coil 10, wherein drive coil 12 is for generation of Primary field, the rate of change of secondary magnetic field is converted into voltage signal by receiving coil 10, this signal is analyzed, just can obtain the wall thickness in tested region.Pop one's head in because drive coil 12 is different with the parameter of receiving coil 10, its wall thickness range that can detect is also different.During detection, suitable probe placement need be chosen on tested region according to the wall thickness range of test specimen, then in drive coil 12, load square wave current, be obtained the wall thickness in tested region by the voltage signal analyzed on receiving coil 10.This probe is applicable to detecting flat test piece, but is not suitable for the detection to pipeline 8 wall thickness.Because pipeline 8 outer wall is the face of cylinder, compare flat test piece and pop one's head in easily to produce in testing process and rock, consequent undesired signal can not be ignored.When drive coil 12 and receiving coil 10 eccentric relative to pipeline 8, when namely popping one's head in eccentric relative to pipeline 8, because in tested region, the distribution of inductive loop there occurs change, signal also can change thereupon.In addition, the change of drive coil 12, distance between receiving coil 10 and pipeline 8 outer wall, the change of lift-off of namely popping one's head in, also can have an impact to signal.Fig. 4 detects by existing pulse eddy current probe the signal waveform obtained for three times to pipeline 8 the same area, as can be seen from Figure 4, owing to being subject to impact that is eccentric and that rock, fluctuate very large between the signal that three times are detected.
Chinese patent ZL200910061369.2 discloses a kind of corrosion of component detection method and device to having permeability magnetic material protective layer; improve the corrosion of component detection sensitivity to band permeability magnetic material protective layer, but signal fluctuation when the method and device cannot avoid testing pipes.Chinese patent ZL200810047686.4 discloses a kind of method, mainly improves Signal-to-Noise from signal transacting angle, but the method cannot overcome the signal fluctuation because probe rocks and causes relative to pipeline bias.
Summary of the invention
For the shortcoming of existing pulse eddy current probe, the invention provides a kind of pulse eddy current probe for pipeline, object is overcome eccentric and rock the signal fluctuation caused.
The technical scheme realizing the object of the invention is specific as follows:
A kind of pulse eddy current probe for pipeline, comprising:
Base, it is the cylindrical shell of upper end open lower end closed, and its openend is provided with end cap, and this base is coaxially arranged on the bottom that is the shell of tubular;
Guidepost, it is arranged on end cap, and this guidepost is socketed with spring, and this spring one end is connected on end cap, and the other end abuts with shell upper end internal face, makes described base be against outer casing bottom;
Drive coil and receiving coil, be nested inside and outside it bottom be arranged on coaxially in base, and the internal diameter of this receiving coil is greater than the external diameter of drive coil;
During detection, described outer casing bottom is placed on described pipeline outer wall, described base is contacted with pipeline outer wall, the Primary field of transition is produced by described drive coil, make tested region respond to transition eddy current thus produce secondary magnetic field, and received by described receiving coil, the wall thickness in tested region can be recorded according to the signal of this reception.
As further preferably, described outer casing bottom end face caves inward, and forms inverted V-type face, for contacting with the outer wall of pipe under test is tangent, to make described shell and pipeline clamping and automatic centering.
As further preferably, described guidepost and described end cap removably connect.
As further preferably, described shell is provided with air plug plug, described end cap has through wires hole, by this air plug plug and through wires hole, realize drive coil, receiving coil and outside electrical connection.
As further preferably, described shell upper is equipped with handle.
As further preferably, described base, end cap and adopt clearance fit between guidepost and shell, under the action of the spring, it can move axially in portion in the enclosure, to adapt to the pipeline of different tube diameters.
As further preferably, cylinder of the base outer wall offers stopper slot, and multiple stop screw stretches in stopper slot through after shell wall, for limiting the position of base etc., comes off when preventing base, end cap and guidepost from moving axially in the enclosure from shell.
As further preferably, described drive coil and the equal coiling of receiving coil are annular, adopt the non-magnetic material of conduction to make.
As further preferably, described handle, shell, base, end cap and guidepost are all made with insulating material.
Technique effect of the present invention is embodied in: the present invention realizes the automatic centering of probe and pipeline by V-type face, convenient and swift, effectively can improve detection efficiency, overcomes existing pulse eddy current probe in testing process because of signal fluctuation that is eccentric and that rock and cause.In addition, under the action of the spring, drive coil and receiving coil can move axially in portion in the enclosure with base, and the distance of itself and pipeline outer wall is remained unchanged when detecting, and prevent the change because of lift-off of popping one's head in have an impact to signal.
Accompanying drawing explanation
Fig. 1 is the radial cross-section of pulse eddy current probe for pipeline when testing pipes of the embodiment of the present invention;
Fig. 2 is the axial cut-open view of pulse eddy current probe for pipeline when testing pipes of the embodiment of the present invention;
Fig. 3 is the radial cross-section of existing pulse eddy current probe when testing pipes;
The oscillogram that Fig. 4 is existing pulse eddy current probe when testing pipes point 3 times;
Fig. 5 is the oscillogram of pulse eddy current probe for pipeline when testing pipes point 3 times of the embodiment of the present invention.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing, following example is only illustrative, does not form limitation of the invention.
Fig. 1 and Fig. 2 is the cut-open view of pulse eddy current probe for pipeline when testing pipes wall thickness of the present embodiment.As depicted in figs. 1 and 2, the pulse eddy current probe for pipeline of the present embodiment comprises drive coil 12, receiving coil 10, base 11, end cap 13, guidepost 2, spring 1, shell 15, screw 3, screw 4, stop screw 5, air plug socket 16 and handle 17.
The tubular of base 11 in upper end open lower end closed, drive coil 12 and receiving coil 10 are contained in base 11.Drive coil 12 and receiving coil 10 all coiling are annular, and the internal diameter of receiving coil 10 is greater than the external diameter of drive coil 12, and drive coil 12 and receiving coil 10 are fixed on bottom base 11, and two coils are coaxial with base 11.Two coil methods preferably adopt enamel covered wire.
Base 11 upper end is closed by end cap 13, and in the present embodiment, end cap 13 is fixed on base 11 upper end by four uniform screws 4 of circumference, and other connected modes also can be adopted to be connected and fixed.
End cap 13 upper surface is fixedly installed the guidepost 2 of column, and in the present embodiment, guidepost 2 is fixed on end cap 13 by four uniform screws 3 of circumference, realizes removably connecting, other dismountable connected modes also can be adopted to be connected and fixed.
Guidepost 2 is set with spring 1.
Above-mentioned base 11, end cap 13 and guidepost 2 entirety are contained in shell 15, and spring 1 one end is connected to the lower end surface of guidepost 2, and the other end is connected on the inwall of shell 15 upper end.
Shell 15 bottom end face, in caving inward, forms inverted V-type face 9, and this V-type face 9 is tangent with pipeline 8 outer wall, and this V-type face 9 is blocked pipeline 8 outer wall and made base 11 and pipeline 8 wall contacts, thus can realize stablizing uninfluenced detection.
Base 11 cylinder body outer wall offers stopper slot 6, and multiple stop screw 5 stretches in stopper slot 6 through after shell 15 wall, for limiting the position of base 11 grade, comes off when preventing base 11, end cap 13 and guidepost 2 from moving axially in shell 15 from shell 15.
Shell 15 top is provided with air plug plug 16, end cap 13 has through wires hole 14, by this air plug plug 16 and through wires hole 14, realizes drive coil 12, receiving coil 10 and outside electrical connection.
For ease of operation, on shell 15 top, handle 17 is housed.
During detection, square wave current is loaded on drive coil 12, the Primary field produced acts on the tested region of pipeline, when electric current generation transition, Primary field is transition thereupon also, according to the law of electromagnetic induction, transition eddy current will be induced in tested region, its rate of decay is relevant with the average thickness in tested region, because the eddy current difficulty in direct-detection test specimen is very large, generally calculate the wall thickness in tested region by detecting the secondary magnetic field produced by eddy current, thus realize the thinning quantitative detection of pipeline wall thickness.The present embodiment receiving coil 10 will be produced by eddy current and the secondary magnetic field of change is converted into voltage signal with its decay, analyzes, just can obtain the wall thickness in tested region to this signal.
The drive coil 12 of different parameters and receiving coil 10, its wall thickness range that can detect is also different.End cap 13 in the present embodiment and adopt screw 3 to realize removably connecting between guidepost 2, is convenient to the integral replacing of drive coil 12, receiving coil 10, base 11 and end cap 13, expands the sensing range of probe.Guidepost 2 one end adopts tubular structure effectively can alleviate probe weight, makes it carry and operates light.
In the present embodiment, handle 17, shell 15, base 11, end cap 13, screw 3, screw 4, stop screw 5 and guidepost 2 are all made with insulating material, can not produce eddy current, thus can not have an impact to signal.Base 11, end cap 13 and what adopt between guidepost 2 and shell 15 is clearance fit, under the effect of spring 1, base 11, end cap 13 and guidepost 2 can move axially in shell 15 inside, screw 3, screw 4, the circumferential distribution character of stop screw 5 and stopper slot 6 makes base 11, end cap 13, guidepost 2 and shell 15 coaxial, prevent in the process moved axially stuck, ensure that base 11 lower surface contacts with pipeline 8 outer wall is tangent all the time, drive coil 12 and receiving coil 10 are remained unchanged when detecting with the distance of pipeline 8 outer wall, the change because of lift-off of popping one's head in is prevented to have an impact to signal.Shell 15 bottom is processed with V-type face 9, and this V-type face 9 is tangent with pipeline 8 outer wall, on the one hand, eliminates the undesired signal caused because rocking; On the other hand, achieve the automatic centering of shell 15 and pipeline 8, because drive coil 12, receiving coil 10 and base 11 are coaxial, and base 11 is coaxial with shell 15, therefore achieve the automatic centering of drive coil 12, receiving coil 10 and pipeline 8, thus reduce signal fluctuation.This is convenient and swift to heart process, effectively can improve detection efficiency.Below V-type face 9, the end face 7 of processing can avoid probe to be destroyed bottom its shell 15 in the process of placing.
Detect three times with pulse eddy current probe for pipeline the same area to pipeline 8 of the present embodiment, its signal waveform as shown in Figure 5.As can be seen from Figure 5, the pulse eddy current probe for pipeline due to the present embodiment not easily occurs eccentric and rocks, and fluctuates very little between the signal that three times are detected.
Claims (6)
1. a pulse eddy current probe for pipeline, comprising:
Base (11), it is the cylindrical shell of upper end open lower end closed, its openend is provided with end cap (13), this base (11) is coaxially arranged on the bottom that is the shell (15) of tubular, this shell (15) bottom end face caves inward, form inverted V-type face, for contacting with the outer wall of pipe under test (8) is tangent, to make described shell (15) and pipeline (8) clamping and automatic centering, described base (11) cylinder body outer wall offers stopper slot (6), multiple stop screw (5) is through stretching in this stopper slot (6) after shell wall, for limiting base (11), the position of end cap (13) and guidepost (2), from wherein coming off when preventing them from moving axially in shell (15),
Guidepost (2), it is arranged on described end cap (13), this guidepost (2) is socketed with spring (1), this spring (1) one end is connected on end cap (13), the other end abuts with described shell (15) upper end internal face, makes described base (11) be against shell (15) bottom;
Drive coil (12) and receiving coil (10), its equal coiling is annular, and inside and outside to be nested the bottom be arranged on coaxially in base (11), and the internal diameter of this receiving coil (10) is greater than the external diameter of drive coil (12);
During detection, described shell (15) bottom is placed on described pipeline (8) outer wall, make described base (11) and pipeline (8) wall contacts, the Primary field of transition is produced by described drive coil (12), make tested region respond to transition eddy current thus produce secondary magnetic field, and received by described receiving coil (10), the wall thickness in tested region can be recorded according to the signal of this reception.
2. a kind of pulse eddy current probe for pipeline according to claim 1, is characterized in that, described guidepost (2) and described end cap (13) removably connect.
3. a kind of pulse eddy current probe for pipeline according to claim 1 and 2, it is characterized in that, described shell (15) is provided with air plug plug (16), described end cap (13) has through wires hole (14), by this air plug plug (16) and through wires hole (14), realize drive coil (12), receiving coil (10) and outside electrical connection.
4. a kind of pulse eddy current probe for pipeline according to claim 1 and 2, is characterized in that, handle (17) is equipped with on described shell (15) top.
5. a kind of pulse eddy current probe for pipeline according to claim 1 and 2, it is characterized in that, described base (11), end cap (13) and be clearance fit between guidepost (2) and shell (15), under the effect of spring (1), they can move axially in shell (15) inside, to adapt to the pipeline (8) of different tube diameters.
6. a kind of pulse eddy current probe for pipeline according to claim 4, it is characterized in that, described handle (17), shell (15), base (11), end cap (13) and guidepost (2) are all made with non-magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210472563.1A CN102967256B (en) | 2012-11-20 | 2012-11-20 | Pulse eddy current probe for pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210472563.1A CN102967256B (en) | 2012-11-20 | 2012-11-20 | Pulse eddy current probe for pipeline |
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| Publication Number | Publication Date |
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| CN102967256A CN102967256A (en) | 2013-03-13 |
| CN102967256B true CN102967256B (en) | 2015-09-23 |
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| CN201210472563.1A Expired - Fee Related CN102967256B (en) | 2012-11-20 | 2012-11-20 | Pulse eddy current probe for pipeline |
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