CN106290558A - A kind of inner and outer walls of pipeline defect detecting device and detection method - Google Patents

Abstract

The open a kind of inner and outer walls of pipeline defect detecting device of the present invention and method, described detection device includes pipeline magnetized module, magnetic field required during for providing pipe detection, and the detection zone of pipeline is divided into pipeline saturated magnetization district and pipeline unsaturation magnetized area；EDDY CURRENT module, for gathering standard specimen pipeline saturated magnetization district and the eddy current signal of telecommunication of pipeline unsaturation magnetized area, resultant impedance figure also obtains the adjustment factor of eddy current signal；And gather pipeline saturated magnetization district and the eddy current signal of telecommunication of pipeline unsaturation magnetized area of pipe under test；Processing module, for judging in described pipe under test whether existing defects according to the eddy current signal of telecommunication of described adjustment factor and described pipeline saturated magnetization district and pipeline unsaturation magnetized area, and when determining existing defects, it is judged that the position of defect, is inner-walls of duct or outer wall.The present invention detects device can accurately judge in pipe under test whether existing defects judge that defect is inwall or outer wall, and easy to detect, accuracy is high.

Description

A kind of inner and outer walls of pipeline defect detecting device and detection method

Technical field

The present invention relates to pipeline inspection technology field, particularly relate to a kind of inner and outer walls of pipeline defect detecting device and detection Method.

Background technology

Ferromagnetic pipeline particularly steel pipe has extremely wide in the industry such as machine-building, petrochemical industry, bridge boats and ships Application, its quality be directly connected to its commercial production live in application, be related to the safety of national economy.EDDY CURRENT Being a kind of lossless detection method that metal class A of geometric unitA is conventional, it utilizes electromagnetic induction principle that test specimen is carried out defects detection, material Inspection and the test etc. of geomery, speed is fast, flaw detection sensitivity is high to have detection, it is not necessary to additional couplant, it is easy to accomplish The advantages such as Aulomatizeted Detect.

But ferromagnetic pipeline is in process of manufacture, exist not owing to the change of neticdomain wall is easily caused its outer surface Uniform pcrmeability, and these uneven pcrmeabilities produce more noise when using EDDY CURRENT, even flood normal defects The eddy current signal produced, causes erroneous judgement.Therefore in engineering when ferromagnetic pipeline is detected in order to reduce permeability Fluctuate the interference to detection signal, and then the signal to noise ratio of raising flaw indication, and detected pipeline is carried out by many employing magnetizing assemblys Locally saturated magnetization, but the method can not accurately determine the defect on pipeline, also cannot effectively distinguish inner and outer walls of pipeline simultaneously and lack Fall into.

Summary of the invention

It is an object of the invention to provide a kind of inner and outer walls of pipeline defect detecting device, can accurately determine the defect on pipeline.

For achieving the above object, the invention provides following scheme:

A kind of inner and outer walls of pipeline defect detecting device, described detection device includes:

Pipeline magnetized module, is arranged around described pipeline, magnetic field required during for providing pipe detection, and described pipeline Detection zone be divided into pipeline saturated magnetization district and pipeline unsaturation magnetized area；

EDDY CURRENT module, for gathering the standard specimen pipeline saturated magnetization district with inner wall defect and pipeline unsaturation magnetization The eddy current signal of telecommunication in district, resultant impedance figure also obtains the adjustment factor of eddy current signal；And the pipeline of collection pipe under test is saturated Magnetized area and the eddy current signal of telecommunication of pipeline unsaturation magnetized area；

Processing module, for according to described adjustment factor and described pipeline saturated magnetization district and pipeline unsaturation magnetized area The eddy current signal of telecommunication judge in described pipe under test whether existing defects, and when determining existing defects, it is judged that the position of defect, It is inner-walls of duct or outer wall.

Optionally, described pipeline magnetized module includes:

First magnetizator, is coaxially disposed with described pipeline, is positioned at pipeline saturated magnetization district, by described pipeline saturated magnetization district Pipeline be magnetized to saturation；

Second magnetizator, is coaxially disposed with described pipeline, is positioned at pipeline unsaturation magnetized area, by described pipeline unsaturation magnetic The pipeline changing district is magnetized to unsaturated state.

Optionally, described EDDY CURRENT module includes:

First sensor, is arranged on described pipeline saturated magnetization district, and is coaxially disposed with described pipeline, be used for gathering pipeline The real part voltage signal in saturated magnetization district and imaginary part voltage signal；

Second sensor, is arranged on described pipeline unsaturation magnetized area, and is coaxially disposed with described pipeline, for collection tube The real part voltage signal of road unsaturation magnetized area and imaginary part voltage signal.

Optionally, described processing module includes:

Signal conditioning circuit, is connected with described EDDY CURRENT module, for the telecommunications to the detection of described EDDY CURRENT module Number it is amplified, filters and phase sensitive detection processes；

Analog to digital conversion circuit, is connected with described signal conditioning circuit, for the simulation exported by described signal conditioning circuit The signal of telecommunication is converted to digital electric signal；

Control circuit, is connected with analog-digital conversion circuit as described, for sentencing according to adjustment factor and described digital electric signal Whether existing defects in disconnected pipeline, and in determining described pipeline during existing defects, it is judged that described defect be outer wall defect still Inner wall defect.

Optionally, described detection device also includes:

Encoder, fixes with described pipeline magnetized module and is connected, determine the axle of defect of pipeline during pipe detection To position.

The specific embodiment provided according to the present invention, the invention discloses techniques below effect:

Inventive pipeline inside and outside wall defect detecting device passes through magnetic field required during pipeline magnetized module offer pipe detection, And make the detection zone of described pipeline is divided into pipeline saturated magnetization district and pipeline unsaturation magnetized area, divided by EDDY CURRENT module Not Cai Ji pipeline saturated magnetization district and the eddy current signal of telecommunication of pipeline unsaturation magnetized area, and then make processing module according to described pipe The eddy current signal of telecommunication of saturated magnetization district, road and pipeline unsaturation magnetized area can accurately judge in pipeline whether existing defects and defect Location, easy to detect, accuracy is high.

It is an object of the invention to provide a kind of inner and outer walls of pipeline defect inspection method, can accurately determine the fault location on pipeline In inner-walls of duct or outer wall.

For achieving the above object, the invention provides following scheme:

A kind of inner and outer walls of pipeline defect inspection method, described detection method includes:

Required magnetic field when pipe detection is provided, and the detection zone of described pipeline is divided into pipeline saturated magnetization district and pipeline non- Saturated magnetization district；

Gather the standard specimen pipeline saturated magnetization district containing inner wall defect and the eddy current signal of telecommunication of pipeline unsaturation magnetized area, close Become impedance diagram and obtain the adjustment factor of eddy current signal；And gather pipeline saturated magnetization district and pipeline unsaturation magnetized area respectively The eddy current signal of telecommunication；

Described detected pipeline whether existing defects is judged according to described adjustment factor and the described eddy current signal of telecommunication, and When determining existing defects, it is judged that the position of defect, it is inner-walls of duct or outer wall.

Optionally, the determination method of described adjustment factor includes:

The eddy current signal of telecommunication according to described standard specimen pipeline saturated magnetization district determines real part voltage signal F_{Mark real1}With imaginary part voltage Signal F_{Mark img1}, and with real part voltage signal as X-axis, imaginary part voltage signal is that Y-axis obtains about the first standard resistance gathering signal Anti-figure；The eddy current signal of telecommunication according to described standard specimen pipeline unsaturation magnetized area determines real part voltage signal F_{Mark real2}With imaginary part voltage Signal F_{Mark img2}, and obtain the second normal impedance figure；

Impedance signal amplitude A of saturated magnetized area defect in standard specimen inner-walls of duct is calculated respectively according to formula (1)_{Mark 1}With non- Impedance signal amplitude A of saturated magnetization district defect_{Mark 2}:

Choose defect impedance signal amplitude A in standard specimen inner-walls of duct saturated magnetization district_{Mark 1}Maximum A_{Mark 1max}, choose standard specimen Defect impedance signal amplitude A of inner-walls of duct unsaturation magnetized area_{Mark 2}Maximum A_{Mark 2max}；

According to formula K=A_{Mark 2max}/A_{Mark 1max}Determine adjustment factor K.

Optionally, judge whether described detected pipeline exists scarce according to described adjustment factor and the described eddy current signal of telecommunication Fall into, and when determining existing defects, it is judged that the position of defect, be inner-walls of duct or the method for outer wall includes:

The eddy current signal of telecommunication according to described tested pipeline saturated magnetization district determines real part voltage signal F_real1With imaginary part voltage Signal F_img1, and obtain the first impedance diagram amplitude F according to below equation₁；Eddy current according to described tested pipeline unsaturation magnetized area The signal of telecommunication determines real part voltage signal F_real2With imaginary part voltage signal F_img2, and obtain the second impedance diagram amplitude according to below equation F₂；

$\left\{\begin{array}{c}{F}_1=\sqrt{{F_{real1}}^2+{F_{img1}}^2}\\ F_2=\sqrt{{F_{real2}}^2+{F_{img2}}^2}\end{array}\right.---\left(2\right)$

After the first and second impedance diagram center superpositions, process the eddy current signal of telecommunication according to formula (3), to obtain real part voltage Signal F_real3With imaginary part voltage signal F_img3:

$\left\{\begin{array}{c}{F}_{real3}=F_{real1}-\frac{F_{real2}}{K}\\ F_{img3}=F_{img1}-\frac{F_{img2}}{K}\end{array}\right.---\left(3\right);$

The 3rd impedance diagram amplitude F is obtained according to below equation₃；

$F_3=\sqrt{{F_{real3}}^2+{F_{img3}}^2}---\left(4\right);$

It is respectively compared described first impedance diagram amplitude F₁Threshold value A is set with first₁Size, and the 3rd impedance diagram amplitude F₃Threshold value A is set with second₃Size:

If F₁<A₁, then zero defect is judged；

If F₁≥A₁And F₃<A₃, then judge that this defect is as inner wall defect；

If F₁≥A₁And F₃≥A₃, then judge that this defect is as outer wall defect.

Relative to prior art, inventive pipeline inside and outside wall defect inspection method fills with above-mentioned inner and outer walls of pipeline defects detection The beneficial effect put is identical, is not repeating at this.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these accompanying drawings Obtain other accompanying drawing.

Fig. 1 is the modular structure schematic diagram of inventive pipeline inside and outside wall defect detecting device；

Fig. 2 is the frame for movement schematic diagram of inventive pipeline inside and outside wall defect detecting device；

Fig. 3 is sensor scheme of installation；

Fig. 4 is that sensor signal processes displaying principle schematic diagram；

Fig. 5 is the flow chart of inventive pipeline inside and outside wall defect inspection method；

Fig. 6 is the 3rd impedance diagram detection inner wall defect situation；

Fig. 7 is the 3rd impedance diagram detection outer wall defect situation.

Symbol description:

Pipeline magnetized module 100 EDDY CURRENT module 200

Processing module 300 signal conditioning circuit 310

Analog to digital conversion circuit 320 control circuit 330

Magnetizing coil 1 magnetizing coil containment vessel 2

Air vent 3 screw 4

First baffle plate 5 second baffle 6

First sensor 7 second sensor 8

Sensor protection shell 9 pipeline saturated magnetization district 10

Pipeline unsaturation magnetized area 11 pipeline 12

Eddy current coil fixed mount 13 fixed block 14

Aviation plug 15.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.

It is an object of the invention to provide a kind of inner and outer walls of pipeline defect detecting device and detection method, by pipeline magnetization Magnetic field required during block offer pipe detection, and make the detection zone of described pipeline is divided into pipeline saturated magnetization district and pipeline non-full And magnetized area, gather pipeline saturated magnetization district and the eddy current telecommunications of pipeline unsaturation magnetized area respectively by EDDY CURRENT module Number, and then make the processing module can be accurate according to the eddy current signal of telecommunication in described pipeline saturated magnetization district and pipeline unsaturation magnetized area Judging in pipeline whether existing defects judge that defect is inwall or outer wall, easy to detect, accuracy is high.

Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, real with concrete below in conjunction with the accompanying drawings The present invention is further detailed explanation to execute mode.

As depicted in figs. 1 and 2, inventive pipeline inside and outside wall defect detecting device includes that pipeline magnetized module 100, eddy current are examined Survey module 200 and processing module 300.Wherein, described pipeline magnetized module 100 is arranged around described pipeline 12, is used for providing pipe Required magnetic field during road detection, and the detection zone of described pipeline is divided into pipeline saturated magnetization district 10 and pipeline unsaturation magnetized area 11；EDDY CURRENT module 200, for gathering the standard specimen pipeline saturated magnetization district 10 with inner wall defect and pipeline unsaturation magnetization The eddy current signal of telecommunication in district 11, resultant impedance figure also obtains the adjustment factor of eddy current signal；And the pipeline of collection pipe under test is full With magnetized area and the eddy current signal of telecommunication of pipeline unsaturation magnetized area；Processing module 300, for according to described adjustment factor and institute State the eddy current signal of telecommunication of pipeline saturated magnetization district and pipeline unsaturation magnetized area and judge in described pipe under test whether existing defects, And when determining existing defects, it is judged that the position of defect, is inner-walls of duct or outer wall.

Specifically, described pipeline magnetized module 100 includes the first magnetizator and the second magnetizator.Wherein, described first magnetic Change device to be coaxially disposed with described pipeline, be positioned at pipeline saturated magnetization district, be magnetized to satisfy by the pipeline in described pipeline saturated magnetization district And state；Described second magnetizator is coaxially disposed with described pipeline, is positioned at pipeline unsaturation magnetized area, by described pipeline unsaturation The pipeline of magnetized area is magnetized to unsaturated state.

As in figure 2 it is shown, described EDDY CURRENT module 200 includes first sensor 7 and the second sensor 8.Wherein, described One sensor 7 is arranged on described pipeline saturated magnetization district 10, and is coaxially disposed with described pipeline 12, is used for gathering the saturated magnetic of pipeline Change real part voltage signal and the imaginary part voltage signal of the eddy current signal of telecommunication in district 10；It is non-full that second sensor 8 is arranged on described pipeline With magnetized area 11, and it is coaxially disposed with described pipeline 12, for gathering the real part of the eddy current signal of telecommunication of pipeline unsaturation magnetized area Voltage signal and imaginary part voltage signal.

Described EDDY CURRENT module 200 resultant impedance figure also obtains the adjustment factor method of eddy current signal:

The eddy current signal of telecommunication according to described standard specimen pipeline saturated magnetization district determines real part voltage signal F_{Mark real1}With imaginary part voltage Signal F_{Mark img1}, and with real part voltage signal as X-axis, imaginary part voltage signal is that Y-axis obtains about the first standard resistance gathering signal Anti-figure；The eddy current signal of telecommunication according to described standard specimen pipeline unsaturation magnetized area determines real part voltage signal F_{Mark real2}With imaginary part voltage Signal F_{Mark img2}, and obtain the second normal impedance figure；

Impedance signal amplitude A of saturated magnetized area defect in standard specimen inner-walls of duct is calculated respectively according to formula (1)_{Mark 1}With non- Impedance signal amplitude A of saturated magnetization district defect_{Mark 2}:

Choose defect impedance signal amplitude A in standard specimen inner-walls of duct saturated magnetization district_{Mark 1}Maximum A_{Mark 1max}, choose standard specimen Defect impedance signal amplitude A of inner-walls of duct unsaturation magnetized area_{Mark 2}Maximum A_{Mark 2max}；

According to formula K=A_{Mark 2max}/A_{Mark 1max}Determine adjustment factor K.

Described detected pipeline whether existing defects is judged according to described adjustment factor and the described eddy current signal of telecommunication, and When determining existing defects, it is judged that the position of defect, it is inner-walls of duct or the method for outer wall includes:

The eddy current signal of telecommunication according to described tested pipeline saturated magnetization district determines real part voltage signal F_real1With imaginary part voltage Signal F_img1, and obtain the first impedance diagram amplitude F according to below equation₁；Eddy current according to described tested pipeline unsaturation magnetized area The signal of telecommunication determines real part voltage signal F_real2With imaginary part voltage signal F_img2, and obtain the second impedance diagram amplitude according to below equation F₂；

$\left\{\begin{array}{c}{F}_1=\sqrt{{F_{real1}}^2+{F_{img1}}^2}\\ F_2=\sqrt{{F_{real2}}^2+{F_{img2}}^2}\end{array}\right.---\left(2\right)$

After the first and second impedance diagram center superpositions, process the eddy current signal of telecommunication according to formula (3), to obtain real part voltage Signal F_real3With imaginary part voltage signal F_img3:

$\left\{\begin{array}{c}{F}_{real3}=F_{real1}-\frac{F_{real2}}{K}\\ F_{img3}=F_{img1}-\frac{F_{img2}}{K}\end{array}\right.---\left(3\right);$

The 3rd impedance diagram amplitude F is obtained according to below equation₃；

$F_3=\sqrt{{F_{real3}}^2+{F_{img3}}^2}---\left(4\right);$

It is respectively compared described first impedance diagram amplitude F₁Threshold value A is set with first₁Size, and the 3rd impedance diagram amplitude F₃Threshold value A is set with second₃Size:

If F₁<A₁, then zero defect is judged；

If F₁≥A₁And F₃<A₃, then judge that this defect is as inner wall defect；

If F₁≥A₁And F₃≥A₃, then judge that this defect is as outer wall defect.

Specifically, described processing module 300 includes signal conditioning circuit 310, analog to digital conversion circuit 320 and control circuit 330.Wherein, described signal conditioning circuit 310 is connected with described EDDY CURRENT module 200, for described EDDY CURRENT module The signal of telecommunication Chen of 200 detections is always amplified, filters and phase sensitive detection process；Analog digital conversion electricity 320 and described signal condition electricity Road 310 connects, for the analog electrical signal that described signal conditioning circuit 310 exports is converted to digital electric signal；Control circuit 330 are connected with analog-digital conversion circuit as described 320, for judging in pipeline according to described adjustment factor and described digital electric signal Whether existing defects and in determining described pipeline during existing defects, it is judged that described defect is outer wall defect or inwall lacks Fall into.

As shown in figs 2-4, in the present embodiment, described pipeline magnetized module 100 comprises the first magnetizator and the second magnetic Changing device, first, second magnetizator all contains magnetizing coil 1 and magnetizing coil containment vessel 2, by magnetizing coil 1 and magnetizing coil The setting of containment vessel 2, pipeline saturated magnetization district 10 is magnetized to saturated by the first magnetizator, and the second magnetizator is by pipeline unsaturation magnetic Change district 11 and be magnetized to unsaturation.Described magnetizing coil containment vessel 2 is made up of permeability magnetic material, is used for protecting magnetizing coil and optimizing magnetic ?.Four faces of described magnetizing coil containment vessel 2 are provided with air vent 3, are used for making magnetizing coil dispel the heat；Described coil is protected The both sides of shell 2 are respectively arranged with 4 screws 4, are used for fixing sensor the first baffle plate 5 and second baffle 6.Described magnetizing coil 1 Formed by the enamel-covered wire coiling of N (N >=300) circle, for providing the magnetic field needed for pipe detection.First sensor 7 and the second sensing Device 8 is connected on aviation plug 15 by coaxial wire respectively.Described aviation plug 15 is fixed on the first baffle plate 5.

The power supply provided for magnetizing coil 1 typically uses DC source, and for providing exciting current for magnetizing coil, it carries Detected ferromagnetic conduit detection region can be magnetized to saturated by the electric current of confession by magnetizing coil.

Described EDDY CURRENT module 200 is additionally operable to accommodating described first sensor 7 or the sensor protection of the second sensor 8 Shell 9.Described first sensor 7 and the second sensor 8 are all for the coil by enameled wire loop coiling, and described sensor protection shell 9 is adopted It is made from an insulative material.The present invention by being arranged at pipeline saturated magnetization district 10 by first sensor 7, and the second sensor 8 is arranged In pipeline unsaturation magnetized area 11, the eddy current signal of inside and outside wall defect difference magnetization degree can be obtained.

Further, described first sensor 7 and the second sensor 8 are fixing all at a step-like eddy current coil fixed mount On 13, eddy current coil fixed mount 13 offsets with the first baffle plate 5, and eddy current sensor offsets with eddy current sensor fixed mount 13, fixing In the axial centre position of magnetizing coil.Four screwed holes are preset, for by whirlpool on eddy current coil fixed mount 13 and fixed block 14 Stream coil fixing support and fixed block are separately fixed on eddy current coil the first and second baffle plate.Contain on described first, second baffle plate Having four screwed holes, be fixed on magnetizing coil containment vessel 2, wherein, described eddy current coil fixed mount and fixed block all use absolutely Edge material is made.

Additionally, inventive pipeline inside and outside wall defect detecting device also includes encoder (not shown), with described pipeline Magnetized module 100 is fixing to be connected, and determines the axial location of defect of pipeline during pipe detection.Further, described volume Code device is fixed on the coil brace of the coil 1 in described pipeline magnetized module 100.

The present invention also provides for a kind of inner and outer walls of pipeline defect inspection method.As it is shown in figure 5, inventive pipeline inside and outside wall defect Detection method includes:

Step 100: required magnetic field when pipe detection is provided, and the detection zone of described pipeline is divided into pipeline saturated magnetization district With pipeline unsaturation magnetized area；

Step 200: gather the standard specimen pipeline saturated magnetization district containing inner wall defect and the eddy current of pipeline unsaturation magnetized area The signal of telecommunication, resultant impedance figure also obtains the adjustment factor of eddy current signal；And collection pipeline saturated magnetization district and pipeline are non-respectively The eddy current signal of telecommunication in saturated magnetization district；

Step 300: judge whether described detected pipeline exists according to described adjustment factor and the described eddy current signal of telecommunication Defect, and when determining existing defects, it is judged that the position of defect, is inner-walls of duct or outer wall.

The determination method of described adjustment factor includes:

The eddy current signal of telecommunication according to described standard specimen pipeline saturated magnetization district determines real part voltage signal F_{Mark real1}With imaginary part voltage Signal F_{Mark img1}, and with real part voltage signal as X-axis, imaginary part voltage signal is that Y-axis obtains about the first standard resistance gathering signal Anti-figure；The eddy current signal of telecommunication according to described standard specimen pipeline unsaturation magnetized area determines real part voltage signal F_{Mark real2}With imaginary part voltage Signal F_{Mark img2}, and obtain the second normal impedance figure；

Impedance signal amplitude A of saturated magnetized area defect in standard specimen inner-walls of duct is calculated respectively according to formula (1)_{Mark 1}With non- Impedance signal amplitude A of saturated magnetization district defect_{Mark 2}:

Choose defect impedance signal amplitude A in standard specimen inner-walls of duct saturated magnetization district_{Mark 1}Maximum A_{Mark 1max}, choose standard specimen Defect impedance signal amplitude A of inner-walls of duct unsaturation magnetized area_{Mark 2}Maximum A_{Mark 2max}；

According to formula K=A_{Mark 2max}/A_{Mark 1max}Determine adjustment factor K.

Described detected pipeline whether existing defects is judged according to described adjustment factor and the described eddy current signal of telecommunication, and When determining existing defects, it is judged that the position of defect, it is inner-walls of duct or the method for outer wall includes:

The eddy current signal of telecommunication according to described tested pipeline saturated magnetization district determines real part voltage signal F_real1With imaginary part voltage Signal F_img1, and obtain the first impedance diagram amplitude F according to below equation₁；Eddy current according to described tested pipeline unsaturation magnetized area The signal of telecommunication determines real part voltage signal F_real2With imaginary part voltage signal F_img2, and obtain the second impedance diagram amplitude according to below equation F₂；

$\left\{\begin{array}{c}{F}_1=\sqrt{{F_{real1}}^2+{F_{img1}}^2}\\ F_2=\sqrt{{F_{real2}}^2+{F_{img2}}^2}\end{array}\right.---\left(2\right)$

After the first and second impedance diagram center superpositions, process the eddy current signal of telecommunication according to formula (3), to obtain real part voltage Signal F_real3With imaginary part voltage signal F_img3:

$\left\{\begin{array}{c}{F}_{real3}=F_{real1}-\frac{F_{real2}}{K}\\ F_{img3}=F_{img1}-\frac{F_{img2}}{K}\end{array}\right.---\left(3\right);$

The 3rd impedance diagram amplitude F is obtained according to below equation₃；

$F_3=\sqrt{{F_{real3}}^2+{F_{img3}}^2}---\left(4\right);$

It is respectively compared described first impedance diagram amplitude F₁Threshold value A is set with first₁Size, and the 3rd impedance diagram amplitude F₃Threshold value A is set with second₃Size:

If F₁<A₁, then zero defect is judged；

If F₁≥A₁And F₃<A₃, then judge that this defect is as inner wall defect；

If F₁≥A₁And F₃≥A₃, then judge that this defect is as outer wall defect.

Additionally, inventive pipeline inside and outside wall defect inspection method also includes arranging encoder, with during pipe detection Determine the axial location of defect of pipeline.

Inventive pipeline inside and outside wall defect detecting device and detection method, utilize inner wall defect under magnetization condition, impedance The feature that in figure, phase place does not changes, is processed by data and separates inner wall defect and outer wall defect area (such as Fig. 6 and Fig. 7 Shown in).For from result, inventive pipeline inside and outside wall defect inspection method achieves eddy current detection method ferromagnetic conduit and distinguishes The purpose of defect inside and outside wall.The side that detected ducting side magnetization limit is carried out EDDY CURRENT is still used due to described detection method Formula, does not exist and only believes by the defect of flooding of surface pcrmeability uneven generation during eddy current detection method detection ferromagnetic pipeline defect Number phenomenon, thus during effectively prevent detection, produce the phenomenon of erroneous judgement.The most described detection method is not required to before detection Repeatedly to regulate excitation supply electric current, it is only necessary to simple operations just can realize detection, operates simpler during examinations Single.The method uses and sets the inner and outer wall of threshold determination defect and position defect axial location simultaneously, it is easy to accomplish On-line automaticization detects, and detects speed.The method still can use the saturated magnetization EDDY CURRENT of maturation to lacking simultaneously Being trapped into row quantitative assessment, therefore reliability is higher.Mode described in this patent can also be on the basis of original EDDY CURRENT Using two groups of conventional vortex coils, versatility is preferable.

In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other The difference of embodiment, between each embodiment, identical similar portion sees mutually.

Principle and the embodiment of the present invention are set forth by specific case used herein, saying of above example Bright method and the core concept thereof being only intended to help to understand the present invention；Simultaneously for one of ordinary skill in the art, foundation The thought of the present invention, the most all will change.In sum, this specification content is not It is interpreted as limitation of the present invention.

Claims (8)

1. an inner and outer walls of pipeline defect detecting device, it is characterised in that described detection device includes:

Pipeline magnetized module, is arranged around described pipeline, magnetic field required during for providing pipe detection, and the inspection of described pipeline Pipeline saturated magnetization district and pipeline unsaturation magnetized area are divided in survey；

EDDY CURRENT module, has the standard specimen pipeline saturated magnetization district of inner wall defect and pipeline unsaturation magnetized area for gathering The eddy current signal of telecommunication, resultant impedance figure also obtains the adjustment factor of eddy current signal；And gather the pipeline saturated magnetization of pipe under test District and the eddy current signal of telecommunication of pipeline unsaturation magnetized area；

Processing module, for according to described adjustment factor and described pipeline saturated magnetization district and the whirlpool of pipeline unsaturation magnetized area The stream signal of telecommunication judges in described pipe under test whether existing defects, and when determining existing defects, it is judged that the position of defect, is to manage Road inwall or outer wall.

Inner and outer walls of pipeline defects detection the most according to claim 1 also distinguishes the device of defective locations, it is characterised in that institute State pipeline magnetized module to include:

First magnetizator, is coaxially disposed with described pipeline, is positioned at pipeline saturated magnetization district, by the pipe in described pipeline saturated magnetization district Road is magnetized to saturation；

Second magnetizator, is coaxially disposed with described pipeline, is positioned at pipeline unsaturation magnetized area, by described pipeline unsaturation magnetized area Pipeline be magnetized to unsaturated state.

Inner and outer walls of pipeline defect detecting device the most according to claim 1, it is characterised in that described EDDY CURRENT module bag Include:

First sensor, is arranged on described pipeline saturated magnetization district, and is coaxially disposed with described pipeline, be used for gathering pipeline saturated The real part voltage signal of magnetized area and imaginary part voltage signal；

Second sensor, is arranged on described pipeline unsaturation magnetized area, and is coaxially disposed with described pipeline, be used for gathering pipeline non- The real part voltage signal in saturated magnetization district and imaginary part voltage signal.

Inner and outer walls of pipeline defect detecting device the most according to claim 1, it is characterised in that described processing module includes:

Signal conditioning circuit, is connected with described EDDY CURRENT module, for entering the signal of telecommunication of described EDDY CURRENT module detection Row amplifies, filters and phase sensitive detection process；

Analog to digital conversion circuit, is connected with described signal conditioning circuit, for the analog telecommunications exported by described signal conditioning circuit Number be converted to digital electric signal；

Control circuit, is connected with analog-digital conversion circuit as described, for sentencing according to described adjustment factor and described digital electric signal Whether existing defects in disconnected pipeline, and in determining described pipeline during existing defects, it is judged that described defect be outer wall defect still Inner wall defect.

5. according to the inner and outer walls of pipeline defect detecting device according to any one of claim 1-4, it is characterised in that described detection Device also includes:

Encoder, fixes with described pipeline magnetized module and is connected, determine the axial position of defect of pipeline during pipe detection Put.

6. one kind uses the inner and outer walls of pipeline according to the inner and outer walls of pipeline defect detecting device according to any one of claim 1-5 Defect inspection method, it is characterised in that described detection method includes:

Required magnetic field when pipe detection is provided, and the detection zone of described pipeline is divided into pipeline saturated magnetization district and pipeline unsaturation Magnetized area；

Gather the standard specimen pipeline saturated magnetization district containing inner wall defect and the eddy current signal of telecommunication of pipeline unsaturation magnetized area, synthesis resistance Anti-figure also obtains the adjustment factor of eddy current signal；And gather pipeline saturated magnetization district and the whirlpool of pipeline unsaturation magnetized area respectively The stream signal of telecommunication；

Described detected pipeline whether existing defects is judged according to described adjustment factor and the described eddy current signal of telecommunication, and really When determining existing defects, it is judged that the position of defect, it is inner-walls of duct or outer wall.

Inner and outer walls of pipeline defect inspection method the most according to claim 6, it is characterised in that described adjustment factor is really The method of determining includes:

The eddy current signal of telecommunication according to described standard specimen pipeline saturated magnetization district determines real part voltage signal F_{Mark real1}With imaginary part voltage signal F_{Mark img1}, and with real part voltage signal as X-axis, imaginary part voltage signal is that Y-axis obtains about the first normal impedance gathering signal Figure；The eddy current signal of telecommunication according to described standard specimen pipeline unsaturation magnetized area determines real part voltage signal F_{Mark real2}Believe with imaginary part voltage Number F_{Mark img2}, and obtain the second normal impedance figure；

Impedance signal amplitude A of saturated magnetized area defect in standard specimen inner-walls of duct is calculated respectively according to formula (1)_{Mark 1}With unsaturation magnetic Change impedance signal amplitude A of district's defect_{Mark 2}:

Choose defect impedance signal amplitude A in standard specimen inner-walls of duct saturated magnetization district_{Mark 1}Maximum A_{Mark 1max}, choose standard specimen pipeline Defect impedance signal amplitude A of inwall unsaturation magnetized area_{Mark 2}Maximum A_{Mark 2max}；

According to formula K=A_{Mark 2max}/A_{Mark 1max}Determine adjustment factor K.

Inner and outer walls of pipeline defect inspection method the most according to claim 7, it is characterised in that according to described adjustment factor with And the described eddy current signal of telecommunication judges described detected pipeline whether existing defects, and when determining existing defects, it is judged that defect Position, be inner-walls of duct or the method for outer wall include:

The eddy current signal of telecommunication according to described tested pipeline saturated magnetization district determines real part voltage signal F_real1With imaginary part voltage signal F_img1, and obtain the first impedance diagram amplitude F according to below equation₁；Eddy current telecommunications according to described tested pipeline unsaturation magnetized area Number determine real part voltage signal F_real2With imaginary part voltage signal F_img2, and obtain the second impedance diagram amplitude F according to below equation₂；

$\left\{\begin{array}{c}{F}_1=\sqrt{{F_{real1}}^2+{F_{img1}}^2}\\ F_2=\sqrt{{F_{real2}}^2+{F_{img2}}^2}\end{array}\right.---\left(2\right)$

After the first and second impedance diagram center superpositions, process the eddy current signal of telecommunication according to formula (3), to obtain real part voltage signal F_real3With imaginary part voltage signal F_img3:

$\left\{\begin{array}{c}{F}_{real3}=F_{real1}-\frac{F_{real2}}{K}\\ F_{img3}=F_{img1}-\frac{F_{img2}}{K}\end{array}\right.---\left(3\right);$

The 3rd impedance diagram amplitude F is obtained according to below equation₃；

$F_3=\sqrt{{F_{real3}}^2+{F_{img3}}^2}---\left(4\right);$

It is respectively compared described first impedance diagram amplitude F₁Threshold value A is set with first₁Size, and the 3rd impedance diagram amplitude F₃With Second sets threshold value A₃Size:

If F₁<A₁, then zero defect is judged；

If F₁≥A₁And F₃<A₃, then judge that this defect is as inner wall defect；

If F₁≥A₁And F₃≥A₃, then judge that this defect is as outer wall defect.