CN215179889U - Whole sensor correcting device of triaxial magnetic leakage internal detector - Google Patents
Whole sensor correcting device of triaxial magnetic leakage internal detector Download PDFInfo
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- CN215179889U CN215179889U CN202120315626.7U CN202120315626U CN215179889U CN 215179889 U CN215179889 U CN 215179889U CN 202120315626 U CN202120315626 U CN 202120315626U CN 215179889 U CN215179889 U CN 215179889U
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- 238000012937 correction Methods 0.000 claims abstract description 15
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- 230000004907 flux Effects 0.000 description 10
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- 238000012360 testing method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
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- 238000004364 calculation method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model discloses a detector complete machine sensor correcting unit in triaxial magnetic leakage, include: the device comprises a magnet, a magnet positioning tool for fixing the magnet and a pipeline tool for installing the magnet positioning tool; the pipeline tool is used for simulating a pipeline and comprises a cylindrical body; magnet location frock includes: the height adjusting bracket is connected with the mounting seat in a sliding manner and is vertical to the outer surface of the cylindrical body; the magnet is fixed on the height adjusting bracket, and the height adjustment of the magnet from the outer surface of the cylinder changes during correction. The utility model discloses a place the magnet and carry out the reinforcing of magnetic signal in magnetic leakage sensor top certain distance department for every magnetic leakage sensor signal difference is obvious, through the different positions of adjusting the magnet, obtains more magnetic leakage sensor signal data, thereby the magnetic sensor calibration of detector complete machine in can accurate triaxial high definition magnetic leakage.
Description
Technical Field
The utility model relates to a pipeline magnetic leakage detection area, in particular to detector complete machine sensor correcting unit in triaxial magnetic leakage.
Background
At present, to detector in the magnetic leakage, the magnetic leakage sensor is the key of measuring the inside and outside defect of pipeline, and the magnetic leakage sensor is because the error that exists during production technology and assembly for there is the difference in the signal between each sensor, and prior art is when rectifying to detector in the small-bore, just corrects to single sensor, and the signal that adopts each sensor of direct measurement compares, because magnetic signal is weak, and the signal difference that leads to each sensor is not obvious, and the correction accuracy is low.
Disclosure of Invention
The utility model provides a triaxial magnetic leakage internal detector complete machine sensor correcting unit for solving the technical problem existing in the prior art.
The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: the utility model provides a detector complete machine sensor correcting unit in triaxial magnetic leakage, includes: the device comprises a magnet, a magnet positioning tool for fixing the magnet and a pipeline tool for installing the magnet positioning tool; the pipeline tool is used for simulating a pipeline and comprises a cylindrical body, and an annular guide rail is sleeved on the outer side of the cylindrical body; the magnet positioning tool comprises a height adjusting bracket which is connected with the annular guide rail in a sliding way and is vertical to the outer surface of the cylindrical body; the magnet is fixed on the height adjusting bracket, and the height adjustment of the magnet from the outer surface of the cylinder changes during correction.
Further, the height adjusting bracket includes: the magnetic field generator comprises a base, a height adjusting rod vertically fixed on the base and a magnet seat fixedly connected with the height adjusting rod; the magnet is fixed on the magnet seat, and the base is connected with the annular guide rail in a sliding manner.
Further, the height adjusting rod is a telescopic rod.
Furthermore, a plurality of mounting holes with different heights from the base are formed in the height adjusting rod; the magnet seat passes through the mounting hole through a bolt and is fixedly connected with the height adjusting rod.
Further, the magnet is a magnet.
Further, the magnet is an electromagnet.
The utility model has the advantages and positive effects that: the prior art is based on single sensor element's correction work more, can calibrate zero offset error, sensitivity error, non-orthogonal error, but can not rectify sensor element and install the measuring error that the complete machine was caused because the difference of magnetic circuit manufacturing process and sensor mounted position, be not suitable for the magnetic sensor calibration of detector complete machine in the triaxial high definition magnetic leakage, the utility model discloses a pipeline frock simulation pipeline operating mode, install all triaxial magnetic sensors of complete machine in the simulation pipeline of pipeline frock structure, through in magnetic leakage sensor top certain distance department, place the magnet and carry out the magnetic signal reinforcing for every magnetic leakage sensor signal difference is obvious, through the different positions of adjusting the magnet, comes more magnetic leakage sensor signal data, thereby can accurately rectify all triaxial magnetic sensors of complete machine.
The utility model discloses an adjustment magnet location frock and pipeline frock's size makes with the triaxial high definition magnetic leakage internal detector phase-match of different bores, can be applied to the correction of the triaxial high definition magnetic leakage internal detector complete machine of different bore sizes.
Drawings
Fig. 1 is the utility model discloses a detector complete machine sensor correcting unit structure sketch map in triaxial magnetic leakage.
Fig. 2 is the utility model discloses a three-dimensional structure schematic diagram of detector complete machine sensor correcting unit behind built-in magnetic leakage sensor in triaxial magnetic leakage.
Fig. 3 is a flowchart of the working process of the whole sensor calibration method of the triaxial magnetic leakage internal detector of the present invention.
In the figure: 1. a height adjustment lever; 2. a magnet holder; 3. a magnet; 4. a base; 5. a slider; 6. an annular guide rail; 7. a pipeline tool; 8. connecting lugs; 9. a boss; 10. three-axis magnetic leakage internal detector.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are listed and will be described in detail with reference to the accompanying drawings:
referring to fig. 1 to 3, a calibration device for a three-axis magnetic flux leakage internal detector complete machine sensor includes: the device comprises a magnet 3, a magnet 3 positioning tool for fixing the magnet 3, and a pipeline tool 7 for installing the magnet 3 positioning tool; the pipeline tool 7 is used for simulating a pipeline and comprises a cylindrical body, and an annular guide rail 6 is sleeved on the outer side of the cylindrical body; the magnet 3 positioning tool comprises a height adjusting bracket which is connected with the annular guide rail 6 in a sliding way and is vertical to the outer surface of the cylindrical body; the magnet 3 is fixed on the height adjusting bracket, and the height adjustment of the magnet 3 from the outer surface of the cylinder changes during correction.
The magnet 3 may be a magnet or an electromagnet. In order to avoid magnetization, the magnet 3 positioning tool is made of a non-magnetic material. The material of the pipeline tool 7 is the same as that of an actual oil pipeline.
The electromagnet can be used for adjusting the current of the coil so as to adjust the magnetic force.
Preferably, the height-adjusting bracket may include: the magnetic field generator comprises a base 4, a height adjusting rod 1 vertically fixed on the base 4, and a magnet base 2 fixedly connected with the height adjusting rod 1; the magnet 3 is fixed on the magnet seat 2, and the base 4 is connected with the annular guide rail 6 in a sliding way.
The height adjusting rod 1 can adopt various structures in the prior art, so that the magnet seat 2 and the height adjusting rod 1 are fixedly connected at different height positions, and the height of the magnet seat 2 relative to the base 4 is adjustable.
For example, the height adjustment rod 1 may be a telescopic rod.
The magnet seat 2 can also be sleeved on the height adjusting rod 1, and then the magnet seat 2 is fixed on the height adjusting rod 1 through jackscrew fixation.
The height adjusting rod 1 can also be provided with a plurality of clamping grooves with different heights from the base 4; the magnet seat 2 is clamped on the clamping groove of the height adjusting rod 1. The magnet seat 2 is clamped on the clamping grooves with different heights, so that the height of the magnet seat 2 relative to the base 4 can be adjusted and changed.
The height adjusting rod 1 can also be provided with a plurality of mounting holes with different heights from the base 4; the magnet seat 2 passes through the mounting hole through a bolt and is fixedly connected with the height adjusting rod 1. The mounting hole on the height adjusting rod 1 can be set into a threaded hole, the magnet base 2 can be L-shaped, a through hole matched with the mounting hole on the height adjusting rod 1 can be arranged on the side surface parallel to the height adjusting rod 1, and the magnet base 2 is fixed on the height adjusting rod 1 by screwing the bolt through the through hole and the mounting hole on the height adjusting rod 1.
The magnet seat 2 can also be provided with a jack; the bolt is inserted into the inserting hole of the magnet seat 2 through the mounting hole on the height adjusting rod 1, and the magnet seat 2 is fixed on the height adjusting rod 1. The magnet seat 2 passes through the mounting holes with different heights through bolts or bolts to be fixedly connected with the height adjusting rod 1, so that the height of the magnet seat 2 relative to the base 4 can be adjusted and changed.
The pipeline tool 7 can adopt a pipeline, can also adopt a pair of semicircular arc plates for butt joint to form a simulation pipeline, and can adopt various butt joint methods in the prior art to butt joint the pair of semicircular arc plates into a cylindrical body for simulating the pipeline. The left side and the right side of each semicircular arc-shaped plate can be provided with connecting lugs 8 with through holes; the bolt is locked after penetrating through the through hole, and the pair of semi-circular arc plates are butted to form a simulation pipeline. The cylindrical body may be provided on its outer surface with a boss 9 for fixing the annular guide rail 6.
The utility model also provides a triaxial magnetic leakage internal detector complete machine sensor correction method, this method sets up following device: the device comprises a magnet 3, a magnet 3 positioning tool for fixing the magnet 3, and a pipeline tool 7 for installing the magnet 3 positioning tool; the pipeline tool 7 is used for simulating a pipeline and comprises a cylindrical body, and an annular guide rail 6 is sleeved on the outer side of the cylindrical body; the magnet 3 positioning tool comprises a height adjusting bracket which is connected with the annular guide rail 6 in a sliding way and is vertical to the outer surface of the cylindrical body; the magnet 3 is fixed on the height adjusting bracket; during the correction, the height of magnet 3 to cylinder surface is adjusted, gathers magnet 3 to the not co-altitude of cylinder surface under, the detection signal of magnetic leakage sensor when magnet 3 moves along cylinder body circumference.
Further, the method can comprise the following specific steps:
and 3, adjusting the height from the magnet 3 to the outer surface of the cylinder, and repeating the step 2 until the signal acquisition is completed at all the heights.
Further, the method can also comprise the step 4: step 1 to step 3 are repeated with the NS of magnet 3 being reversed.
Further, when the initial calibration is set, the bottom of the height adjusting support is located at a certain point of the annular guide rail, the distance from the position of the magnet to the surface of the cylinder is a, the bottom of the height adjusting support moves along the annular guide rail by a central angle of 90 degrees, and the three-axis magnetic field intensity measured by the magnetic flux leakage sensor is obtained and calculated as follows:
wherein
For the n-th test of the triaxial magnetic leakage data of the jth sampling point of the ith channel,
for the x-axis leakage data of the jth sampling point of the ith channel of the nth test,
for the y-axis leakage data of the jth sampling point of the ith channel in the nth test,
the z-axis magnetic flux leakage data of the jth sampling point of the ith channel in the nth test is shown, wherein i is 1,2 … k, j is 1,2 … t, k is the number of sampling channels, and t is the number of sampling points;
keeping the height a of the magnet from the surface of the cylinder unchanged, enabling the bottom of the height adjusting support to move along the surface of the cylinder in a clockwise or anticlockwise circumferential direction, collecting detection signals of the magnetic leakage sensors after moving a central angle of 90 degrees each time, enabling the bottom of the height adjusting support to move three times along the surface of the cylinder in the circumferential direction, sequentially collecting detection signals of four groups of three-axis magnetic leakage sensors, obtaining detection data of the magnetic leakage sensors of 360 degrees corresponding to the magnet under the working condition of height a, and recording the detection data as Da，DaThe expression of (a) is as follows:
Da＝[D(1),D(2),D(3),D(4)]；
d (1), D (2), D (3) and D (4) correspond to triaxial magnetic flux leakage data acquired by circumferentially moving the bottom of the height adjusting bracket four times along the surface of the cylinder and moving the central angle of 90 degrees each time in sequence;
adjusting the position of the magnet to b and c, and Db、DcCorrespondingly acquiring the three-axis magnetic flux leakage data of the magnetic flux leakage sensor at 360 degrees under the working conditions of the heights b and c of the magnet;
the operation was repeated by changing the N, S order of the magnets, and D was seta′、Db'、Dc'After NS level is exchanged correspondingly, acquiring triaxial magnetic flux leakage data of the magnetic flux leakage sensor at 360 degrees under working conditions that the corresponding magnet is positioned at the heights a, b and c;
correcting the data, and solving the magnetic field value of the maximum magnetic field value channel of the triaxial data of all the magnetic leakage sensor channels of each sampling point, wherein
mxi(n) represents the x-axis magnetic field value of the ith channel for the maximum magnetic field value of the nth test; myi(n) represents the y-axis magnetic field value for the ith channel maximum magnetic field value channel of the nth trial; mz (m)i(n) represents the z-axis magnetic field value of the ith channel for the maximum magnetic field value of the nth test;
let Da、Db、Dc、Da′、Db′、Dc′The magnetic field value of the maximum magnetic field value channel in the triaxial data of all the magnetic leakage sensor channels of each sampling point corresponds to B in sequencea、Bb、Bc、Ba′、Bb′、Bc′Wherein:
by the same way, obtain Bb、Bc、Ba′、Bb′、Bc′And recording the channel T of the maximum magnetic field value at each sampling point, wherein,
T＝[w1,w1,...w1,w2,...,wn]1*4k，w1,w2,...,wn＝1,2,...,t；
at this time BaOf (1) [ mx ]k(n),myk(n),mzk(n)]TRepresented by the maximum magnetic field channel three-axis data of the kth sampling point between the nth 90 degreesaTo convert to:
wherein [ mx (w), my (w), mz (w)]TThree-axis data on the w-th channel;
obtaining T by the same methodb、Tc、Ta′、Tb′、Tc′；
For TaEach column vector [ mx (w), my (w), mz (w)]TAnd w is 1, 2.. and t is used for solving a similarity matrix to obtain:
the calculation formula of the similarity between the vectors in the ith column and the jth column is as follows:
where C (i, j) ═ C (j, i), C is obtained in the same wayb、Cc、Ca′、Cb′、Cc′；
Setting a similarity threshold s, if c (i, j), i and j are 1,2,. t is less than the threshold s, t is the number of sampling channels, and defining the i and j channels as invalid channels; if c (i, j) is larger than the threshold value s, defining the i channel and the j channel as effective channels; this results in an effective channel set h, h ═ 1,. 1,2,. k],
Wherein k is 1,2,. and t,set effective channel data as
Wherein
w' belongs to h and is obtained by the same way
In that
In the data collected by the effective channel, the mean value is calculated for each row vector as follows:
wherein,
represents the average of the data collected for the x-axis active channel,
represents the average of the data collected for the y-axis active channel,
means representing data collected by the z-axis active channel;
is provided with
Corresponds to DaEffective standard data under the working condition of (1);
denote by N the correspondence Da、Db、Dc、Da′、Db′、Dc′Effective standard data of six working conditions, the expression of N is as follows:
calculating correction parameters for each channel by using effective standard data, and setting the correction parameter of j channel of x axis as Hxj，HxjThe calculation formula of (a) is as follows:
wherein
Acquiring the maximum value of data of all jth channels under the ith working condition of the x axis; let l ═ la, lb, lc, la ', lb ', lc '; la, lb, lc, la ', lb ' and lc ' are sequentially corresponding to Da、Db、Dc、Da′、Db′、Dc′Six working conditions; j is 1,2,. t, t is the number of sampling channels;
obtaining Hy by the same methodj、Hzj；
Further obtaining the following triaxial magnetic flux leakage sensor output correction model:
wherein mxj、myj、mzjIn order to correct the magnetic field data acquired before,
is the corrected data.
The following is to further explain the working principle of the utility model by the correction work flow:
the sensor of the whole triaxial high-definition magnetic leakage internal detector is placed in the pipeline tool 7, so that a magnetic circuit in a magnetic leakage joint of the magnetic leakage internal detector is tightly attached to the inner wall of a pipeline. Install 3 location frocks of magnet on pipeline frock 7, magnet is fixed on the altitude mixture control support, and the base 4 of altitude mixture control support is installed on ring rail 6, and the position is directly over the magnetic leakage sensor, and 3 location frocks of magnet are equipped with three high fender position of a, b, c, can be through the high distance of adjusting 3 bottom surfaces of magnet and base 43. The strength of the magnetic signal can be changed by adjusting the height distance between the bottom surface of the magnet 3 and the base 4, and different sensor signals can be obtained by moving the position of the base 4 of the height adjusting bracket on the guide rail.
The annular guide rail 6 can comprise two parallel guide rails A and B, through holes are formed in the side edges of the guide rails, and threaded holes for fixing the annular guide rail 6 are formed in the outer surface of the cylindrical body. The ring rail 6 is mounted on the cylindrical body by screws. Firstly, the slide block 5 is arranged in the guide rails, and then the two guide rails are connected through the connecting piece and integrally arranged on the pipeline tool 7. The magnet for correction is arranged on the magnet seat 2, and then the magnet seat 2 is arranged on the height adjusting support which is provided with three mounting positions, and the heights of the three mounting positions are different from the height of the base 4, so that the height of the magnet can be adjusted. After the installation is finished, the magnet can start to move from one end of the annular guide rail 6 for testing, the walking stroke angle can be a central angle of 90 degrees, after the test is finished, the height of the magnet seat 2 is kept unchanged, the magnet continues to move along the annular guide rail 6 for testing by the movement of the central angle of 90 degrees, and a sensor signal is acquired; the signal of the leakage sensor is measured 4 times in this way over a 360 deg. range.
Wherein, the guide rail A, the guide rail B, the height adjusting bracket, the magnet base 2 and the sliding block 510 are all made of non-magnetic materials. If the parts are made of magnetic conductive materials, the magnets magnetize the parts, the magnetic field distribution is influenced, the measuring signals of the sensor are inaccurate, and therefore the magnetic non-conductive materials are selected.
The following further describes the components of the above-described apparatus:
1. the correcting magnet is used as the magnet 3 to increase the intensity of the magnetic field signal.
2. The pipeline tool 7 is made of the same material as the oil and gas pipelines, the two pipeline tools 77 are connected together through holes on two sides by bolts and nuts, the inner detector is placed in the pipeline tool, and the working condition of the detector in the actual pipeline is simulated.
3. The height adjusting bracket is made of non-magnetic materials and comprises a base 4, a height adjusting rod 1 vertically fixed on the base 4, a magnet seat 2 vertically connected with the height adjusting rod 1, and a magnet 3 fixed on the magnet seat 2.
Magnet seat 21 passes through the screw and is connected with altitude mixture control pole 1, and altitude mixture control pole 1 is equipped with three altitude mixture control mounting hole, can adjust the height of magnet distance magnetic leakage sensor for the correction, can gather the signal of magnetic leakage sensor respectively under the not co-altitude condition simultaneously.
The base 4 of the height adjusting support is provided with a sliding block 5 in sliding fit with the annular guide rail 6, and the sliding block 5 is used for driving the height adjusting support to slide relative to the annular guide rail 6.
And a magnet holder 2 for fixing the magnet for calibration, which is made of a non-magnetic material and is connected to the magnet for calibration by a screw.
4. The annular guide rail 6 comprises a guide rail A and a guide rail B, and the guide rail A and the guide rail B are made of non-magnetic conductive materials. The guide rail A is matched with the guide rail B to form a sliding groove in sliding fit with the sliding block 5, the bottom of the sliding block 5 is embedded into the sliding groove and slides along the sliding groove to form a working stroke track of the sliding block 5. The guide rail A, B is connected with the pipeline tool 7 through a screw and is installed on the pipeline tool 7.
6. The guide rail connecting piece is connected with the two ends of the guide rail A and the guide rail B and used for positioning the moving initial stroke of the sliding block 5, the guide rail connecting piece is made of non-magnetic conductive materials, the sliding block 5 is firstly installed in the guide rail A during assembly, and then the guide rail connecting piece and the guide rail B are connected with the two ends of the guide rail A.
The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, the scope of the present invention should not be limited by the embodiment, that is, all equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.
Claims (6)
1. The utility model provides a detector complete machine sensor correcting unit in triaxial magnetic leakage which characterized in that includes: the device comprises a magnet, a magnet positioning tool for fixing the magnet and a pipeline tool for installing the magnet positioning tool; the pipeline tool is used for simulating a pipeline and comprises a cylindrical body, and an annular guide rail is sleeved on the outer side of the cylindrical body; the magnet positioning tool comprises a height adjusting bracket which is connected with the annular guide rail in a sliding way and is vertical to the outer surface of the cylindrical body; the magnet is fixed on the height adjusting bracket, and the height adjustment of the magnet from the outer surface of the cylinder changes during correction.
2. The correcting device for the whole sensor of the triaxial leakage internal detector according to claim 1, wherein the height adjusting bracket comprises: the magnetic field generator comprises a base, a height adjusting rod vertically fixed on the base and a magnet seat fixedly connected with the height adjusting rod; the magnet is fixed on the magnet seat, and the base is connected with the annular guide rail in a sliding manner.
3. The complete machine sensor correcting device of the triaxial magnetic leakage internal detector as claimed in claim 2, wherein the height adjusting rod is a telescopic rod.
4. The correcting device of the whole sensor of the triaxial magnetic leakage internal detector according to claim 2, wherein the height adjusting rod is provided with a plurality of mounting holes with different heights from the base; the magnet seat passes through the mounting hole through a bolt and is fixedly connected with the height adjusting rod.
5. The device for correcting the sensor of the whole triaxial internal leakage detector according to claim 1, wherein the magnet is a magnet.
6. The device for calibrating the whole sensor of the triaxial leakage internal detector according to claim 5, wherein the magnet is an electromagnet.
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| CN202120315626.7U CN215179889U (en) | 2021-02-03 | 2021-02-03 | Whole sensor correcting device of triaxial magnetic leakage internal detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816546A (en) * | 2021-02-03 | 2021-05-18 | 中海石油(中国)有限公司 | Device and method for correcting sensor of complete machine of triaxial magnetic leakage internal detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816546A (en) * | 2021-02-03 | 2021-05-18 | 中海石油(中国)有限公司 | Device and method for correcting sensor of complete machine of triaxial magnetic leakage internal detector |
| CN112816546B (en) * | 2021-02-03 | 2024-04-30 | 中海石油(中国)有限公司 | Device and method for correcting complete machine sensor of triaxial magnetic flux leakage internal detector |
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