CN109506558A - Large container stainless steel lining thickness detecting system and method based on EDDY CURRENT - Google Patents
Large container stainless steel lining thickness detecting system and method based on EDDY CURRENT Download PDFInfo
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- CN109506558A CN109506558A CN201811534534.7A CN201811534534A CN109506558A CN 109506558 A CN109506558 A CN 109506558A CN 201811534534 A CN201811534534 A CN 201811534534A CN 109506558 A CN109506558 A CN 109506558A
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- steel lining
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- stainless steel
- protection shell
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
一种基于涡流检测的大型容器不锈钢衬厚度检测系统及方法，该检测系统包括盘式线圈探头和探头定位辅助装置，盘式线圈可用来施加激励电流和采集检出信号，该检出信号包含不锈钢衬厚度信息；探头定位辅助装置可在检测中辅助探头以消除探头提离和偏斜对检测结果的干扰；涡流检测信号分析方法中，首先基于不同钢衬厚度标样确定钢衬厚度‑信号特征量标定曲线，其次通过检测系统测量获得待测点的信号特征量，最后基于标定曲线提取实验所得特征量所对应的厚度值，即为待测点钢衬厚度；本发明检测系统和方法能够对大型容器不锈钢衬进行定点的无损定量评估，能从原理上消除提离对检测结果的影响，且具有检测系统结构简单、操作方便快捷、检测结果稳定、涉及数据量小、应用性广泛等优点。
A system and method for detecting the thickness of a stainless steel lining of a large vessel based on eddy current detection, the detection system includes a disc coil probe and a probe positioning auxiliary device, the disc coil can be used to apply excitation current and collect a detection signal, the detection signal contains stainless steel Lining thickness information; the probe positioning aid device can assist the probe during inspection to eliminate the interference of probe lift-off and deflection on the inspection results; in the eddy current inspection signal analysis method, the steel lining thickness-signal characteristics are first determined based on different steel lining thickness standards Then, the signal characteristic quantity of the point to be measured is obtained by measuring the detection system, and finally the thickness value corresponding to the characteristic quantity obtained by the experiment is extracted based on the calibration curve, which is the thickness of the steel lining of the point to be measured; the detection system and method of the present invention can The fixed-point non-destructive quantitative evaluation of the stainless steel lining of large vessels can eliminate the influence of lift-off on the test results in principle, and has the advantages of simple structure of the detection system, convenient and quick operation, stable test results, small amount of data involved, and wide application.
Description
Technical field
The present invention relates to large container stainless steel steel lining thickness Nondestructive Evaluation technical fields, and in particular to one kind is based on vortex
The large container stainless steel lining thickness detecting system and method for detection.
Background technique
Large container matrix is mostly steel material, since Service Environment is complicated and changeable, during normal service, and Chang Huishou
To the influence of the material corrosion container of chemical substance (be common in fill) etc., it is to contain the large container of toxic gas or liquid
Example, the destruction of container body will lead to dangerous substance leakage inside container, constitute to the security of the lives and property and greatly threaten, to avoid
The generation of such accident, container matrix is separated by by container inside using stainless steel lining with environment to be left, to slow down or avoid
Corrosion etc., which occurs, for container body destroys.Although stainless steel steel lining is relatively difficult in severe Service Environment compared to steel container body
It is middle to corrode, but active time is too long, can inevitably destroy, and leads to not influence of the security isolation environment to container body,
Therefore, periodically most important to container stainless steel lining progress Thickness sensitivity.
For the Thickness Evaluation of container, most common method is ultrasound examination, but large container stainless steel steel lining and
For container contact level generally using being welded and fixed, interface actual conditions are complex, and mainly application is super for ultrasonic detection technology
Sound wave carries out Thickness Evaluation to the reflected wave information at interface, therefore greatlys restrict the use scope of ultrasonic detection technology.
In addition, ultrasonic detection technology must use couplant, and steel lining surface is directly exposed in adverse circumstances, is not convenient to use coupling
Mixture.Eddy detection technology can then avoid two above problem well, therefore in order to more efficiently to large container stainless steel
Lining carries out Thickness Evaluation, and it is very necessary to study suitable eddy detection technology.
Summary of the invention
It is an object of the invention to propose a kind of large container stainless steel lining thickness detecting system based on EDDY CURRENT and
Method, so that the qualitative assessment that large container stainless steel steel lining is pinpointed can be eliminated lift-off from principle and be tied to detection
The influence of fruit, and have non-contact, detection system structure is simple, easy to operate, and testing result is stable, it is small to be related to data volume
The advantages that.
To achieve the above objectives, the present invention adopts the following technical scheme:
A kind of large container stainless steel lining thickness detecting system based on EDDY CURRENT, including sandwich wound coil and probe auxiliary
Device, the sandwich wound coil include coil rack 1 and the sandwich wound coil conducting wire that is wound on coil rack 1, sandwich wound coil conducting wire from
Coil rack metallic channel 2 is drawn；The probe assisting device includes coil protection shell 3, pin 5, spring 7 and probe protection
Shell 8, the coil protection shell 3 are coated on outside coil rack 1, and bottom end is fixed with 1 bottom end of coil rack；Coil protection is outer
There is conducting wire locating slot 6 on 3 top of shell, and there is pin hole 4 in side；The spring 7 is placed in 3 top of coil protection shell, and the probe is protected
Shield shell 8 is coated on outside spring 7 and coil protection shell 3, and probe protection 8 top of shell has conducting wire to portal 10, side and line
4 corresponding position of pin hole of circle protection 3 side of shell is provided with cotter slot 9；The disc type line that the coil rack metallic channel 2 is drawn
It encloses conducting wire and export from 3 upper surface center of shell is protected from coil by conducting wire locating slot 6, and passed through from 7 axis of spring, by leading
Line portals 10 extractions；Described 5 one end of pin is fixed in pin hole 4, and the other end is placed in cotter slot 9, so that coil protection is outer
Shell 3 moves in the axial direction in probe protection shell 8, and the length of cotter slot 9 can control coil protection shell 3 mobile phase every time
Same distance, to guarantee that coil protection shell 3 and coil rack 1 by uniform pressure, are mentioned to reach in detection every time every time
Separation is from identical purpose.
The sandwich wound coil conducting wire is wrapped on coil rack 1.
The large container stainless steel lining thickness detecting system based on EDDY CURRENT carries out large container stainless steel lining
The method of Thickness sensitivity,
1) establish steel lining thickness-signal characteristic quantity calibration curve: production is a series of for establishing steel lining thickness-signal characteristic
The calibration element of calibration curve is measured, compared to the thickness detecting system, large container size is very big, so that test point is attached
Near field can be considered plate, therefore can establish calibration curve based on the calibration element of double panel structure；These calibration elements are by two parts
Composition: the stainless steel layer on upper layer and the carbon element steel layer of lower layer, stainless steel layer are steel lining, and carbon element steel layer is large container matrix, often
The carbon element steel layer thickness of a calibration element is identical, and stainless steel layer thickness t is different, and the 1mm≤t≤4mm will be based on EDDY CURRENT
Large container stainless steel lining thickness detecting system is successively disposed vertically in each calibration element steel lining side upper surface, is pressed from top to bottom
Probe protection shell 8, completely attaches to sandwich wound coil lower surface and steel lining upper surface, holds to each large size based on EDDY CURRENT
The sandwich wound coil of device stainless steel lining thickness detecting system successively applies identical sinusoidal excitation signal, stainless steel layer and carbon
Vortex can be generated in steel layer, vortex can excite secondary magnetic field, sandwich wound coil impedance signal be influenced, due to stainless steel and carbon steel
Material parameter especially relative permeability difference it is larger, the thickness of stainless steel lining will affect the power and distribution of secondary magnetic field,
And then the impedance signal of sandwich wound coil is influenced, therefore the characteristic quantity by characterizing the impedance signal detects steel lining thickness, it acquires
Detect impedance signal, and calculate inductance and resistance ratio, as corresponding characteristic quantity, establish steel lining thickness-signal characteristic quantity it
Between matched curve, as steel lining thickness-signal characteristic quantity calibration curve；
2) tested point is obtained by experiment and detects characteristic quantity: the large container stainless steel lining thickness based on EDDY CURRENT is examined
Examining system is disposed vertically in tested point steel lining side upper surface, and pressing probe protection shell 8, makes sandwich wound coil following table from top to bottom
Face and steel lining upper surface completely attach to, and application and identical sinusoidal excitation signal in step 1) obtain detection impedance signal,
And calculate corresponding characteristic quantity；
3) it calculates tested point steel lining thickness value: in the resulting calibration curve of step 1), obtaining and feature obtained by step 2)
Measure corresponding steel lining thickness value, as tested point steel lining thickness.
Compared to the prior art compared with the present invention has following advantage:
1) present invention can be for the quantitative detection that large container stainless steel lining thickness is pinpointed, and detection system is simple,
It is easy to operate, greatly and the deficiency of couplant is needed by effect of the interface meanwhile, it is capable to make up ultrasonic detection technology, it can be very big
Improve detection efficiency in ground.
2) can be made using probe assisting device by the booster action of contained spring and other components in the present invention
Sandwich wound coil, by identical pressure, and then can eliminate lift off to the shadow of testing result in each detection from principle
It rings, has many advantages, such as that testing result is stable, it is small to be related to data volume.
Detailed description of the invention
Fig. 1 is probe assisting device structural schematic diagram of the present invention.
Fig. 2 is relative position schematic diagram between coil rack of the present invention and coil probe protection shell.
Fig. 3 is that coil of the present invention protects shell and probe protection cage connection schematic diagram.
Steel lining thickness-signal characteristic quantity calibration curve that Fig. 4 is established by the embodiment of the present invention.
Specific embodiment
The testing principle of the method for the present invention are as follows: according to EDDY CURRENT principle, when applying certain frequency just to sandwich wound coil
When string pumping signal, vortex can be generated in steel backing layer, container matrix layer, vortex can excite secondary magnetic field, influence sandwich wound coil
Impedance signal, since stainless steel differs larger with the material parameter (especially relative permeability) of carbon steel, the thickness of steel lining will
The power and distribution of secondary magnetic field are influenced, and then influences the impedance signal of sandwich wound coil, therefore can be by characterizing impedance letter
Number characteristic quantity detect steel lining thickness.Pass through numerical simulation and experiment discovery: under same steel lining thickness, sandwich wound coil detection resistance
There are quadratic function relations with steel lining thickness for the ratio between the imaginary part of antinoise signal and real part, therefore can be using the ratio as characterization steel lining thickness
Characteristic quantity, establish steel lining thickness-signal characteristic quantity curve, therefore, can by experiment obtain corresponding to tested point
Characteristic quantity, and corresponding thickness value is extracted in steel lining thickness-signal characteristic quantity calibration curve, steel lining is thick as at test point
Degree.In addition, probe assisting device can guarantee that in each detection, spring 7 generates identical deformation, according to Hooke's law, disk
The pressure that formula coil is subject to every time is all the same, so that the lift off popped one's head in controllable detection every time is identical, i.e., from principle
Eliminate the adverse effect that lift off generates testing result.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the present embodiment is a kind of large container stainless steel lining thickness detecting system based on EDDY CURRENT, packet
Include sandwich wound coil and probe assisting device, in sandwich wound coil, the conducting wire being wound on coil rack 1 draws from coil rack metallic channel 2
Out；Probe assisting device includes coil protection shell 3, pin 5, spring 7 and probe protection shell 8；Coil protects shell 3 to push up
There is conducting wire locating slot 6 at end, and there is pin hole 4 in side；Probe protection 8 top of shell has conducting wire to portal 10, and there is cotter slot 9 in side.
As shown in Fig. 2, coil protection 3 bottom end of shell and coil rack 1 are fixed, guarantee coil case 3 and 1 energy of coil rack
It enough moves synchronously, and coil protection shell 3, when being under pressure, coil rack 1 is by identical pressure.Sandwich wound coil conducting wire can
It draws from coil rack metallic channel 2, is exported by conducting wire locating slot 6, then from coil protection 3 upper surface center of shell.
As shown in figure 3, coil protects shell 3 to connect with probe protection 8 side of shell by pin 5.5 one end of pin is fixed
In pin hole 4, the other end is placed in cotter slot 9, so coil protection shell 3 and pin 5 can be outer along probe protection simultaneously
The relative movement of 8 axis direction of shell；Spring 7 is placed in 3 top of coil protection shell；Spring 7 and coil protection shell 3 are placed in probe and protect
It protects inside shell 8；7 axis of spring may pass through by the conducting wire that conducting wire locating slot 6 is drawn, then portal outside 10 extractions probe from conducting wire
Portion.
The method that large container stainless steel lining thickness detecting system described above based on EDDY CURRENT carries out Thickness sensitivity,
It is carried out by following steps:
1) steel lining thickness-signal characteristic quantity calibration curve is established.Production 4 for establishing steel lining thickness-signal characteristic quantity
The calibration element of calibration curve, compared to the thickness detecting system, large container size is very big, so that near test point
Region can be considered plate, therefore can establish calibration curve based on the calibration element of double panel structure；These calibration elements are by two parts group
At: the stainless steel layer on upper layer and the carbon element steel layer of lower layer, stainless steel layer are steel lining, and carbon element steel layer is large container matrix, by base
It is successively disposed vertically in the large container stainless steel lining thickness detecting system of EDDY CURRENT in each calibration element steel lining side upper surface,
Pressing probe protection shell 8 from top to bottom, completely attaches to sandwich wound coil lower surface and steel lining upper surface, to each based on vortex
It is 30kHz that the sandwich wound coil of the large container stainless steel lining thickness detecting system of detection, which successively applies frequency, and size is 20mA's
Constant current drive signal, acquisition detection impedance signal, and inductance and resistance ratio are calculated, and as corresponding characteristic quantity, calibration element tool
Body size and characteristic quantity are as shown in table 1, establish steel lining thickness-signal characteristic quantity calibration curve, as shown in figure 4, its expression formula are as follows:
1 calibration element structural parameters of table
2) tested point is obtained by experiment and detects characteristic quantity.By the large container stainless steel lining thickness inspection based on EDDY CURRENT
Examining system is disposed vertically in tested point steel lining side upper surface, and pressing probe protection shell 8, makes sandwich wound coil following table from top to bottom
Face and steel lining upper surface completely attach to, and application and identical sinusoidal excitation signal in step 1) obtain detection impedance signal,
And calculate corresponding characteristic quantity；
3) tested point steel lining thickness value is calculated.In the resulting calibration curve of step 1), obtain and feature obtained by step 2)
Measure corresponding steel lining thickness value, as tested point steel lining thickness, true value, the detected value of three tested point stainless steel lining thickness
And relative error is as shown in table 2.
2 tested point steel lining Thickness sensitivity result of table
By 2 testing result of table it is found that detection error in allowed limits, to prove the feasibility of the detection system.
Claims (3)
1. a kind of large container stainless steel lining thickness detecting system based on EDDY CURRENT, it is characterised in that: including sandwich wound coil
And probe assisting device, the sandwich wound coil include coil rack (1) and the sandwich wound coil conducting wire that is wound on coil rack (1),
Sandwich wound coil conducting wire is drawn from coil rack metallic channel (2)；The probe assisting device includes coil protection shell (3), pin
(5), spring (7) and probe protection shell (8), coil protection shell (3) are coated on coil rack (1) outside, bottom end
It is fixed with coil rack (1) bottom end；Coil protection shell (3) top has conducting wire locating slot (6), and side has pin hole (4)；It is described
Spring (7) is placed at the top of coil protection shell (3), and probe protection shell (8) is coated on spring (7) and coil protection shell
(3) external, probe protection shell (8) top has conducting wire to portal (10), the pin hole of side and coil protection shell (3) side
(4) corresponding position is provided with cotter slot (9)；The sandwich wound coil conducting wire that the coil rack metallic channel (2) is drawn is fixed by conducting wire
Position slot (6) exports from coil protection shell (3) upper surface center, and passes through from spring (7) axis, portals (10) by conducting wire
It draws；Described pin (5) one end is fixed in pin hole (4), and the other end is placed in cotter slot (9), so that coil protects shell
(3) it is moved in the axial direction in probe protection shell (8), the length of cotter slot (9) can control coil protection shell (3) each
Mobile same distance, to guarantee coil protection shell (3) and coil rack (1) every time by uniform pressure, to reach every
The identical purpose of lift off in secondary detection.
2. a kind of large container stainless steel lining thickness detecting system based on EDDY CURRENT according to claim 1, special
Sign is: the sandwich wound coil conducting wire is wrapped on coil rack (1).
3. the large container stainless steel lining thickness detecting system described in claim 1 based on EDDY CURRENT carries out large container not
The method of rust steel lining Thickness sensitivity, it is characterised in that:
1) establish steel lining thickness-signal characteristic quantity calibration curve: production is a series of for establishing steel lining thickness-signal characteristic quantity mark
The calibration element for determining curve, compared to thickness detecting system described in claim 1, large container size is very big, so that inspection
Measuring point near zone can be considered plate, therefore the calibration element based on double panel structure establishes calibration curve；These calibration elements are by two
Part forms: the stainless steel layer on upper layer and the carbon element steel layer of lower layer, and stainless steel layer is steel lining, and carbon element steel layer is large container base
The carbon element steel layer thickness of body, each calibration element is identical, and stainless steel layer thickness t is different, the 1mm≤t≤4mm, will be based on vortex
The large container stainless steel lining thickness detecting system of detection is successively disposed vertically in each calibration element steel lining side upper surface, on to
Lower pressing probe protection shell (8), completely attaches to sandwich wound coil lower surface and steel lining upper surface, is based on EDDY CURRENT to each
The sandwich wound coil of large container stainless steel lining thickness detecting system successively apply identical sinusoidal excitation signal, stainless steel
Vortex can be generated in layer and carbon element steel layer, vortex can excite secondary magnetic field, sandwich wound coil impedance signal be influenced, due to stainless steel
Differ larger with the material parameter of carbon steel especially relative permeability, the thickness of stainless steel lining will affect the power of secondary magnetic field
And distribution, and then the impedance signal of sandwich wound coil is influenced, therefore the characteristic quantity by characterizing the impedance signal is thick to detect steel lining
Degree, acquisition detection impedance signal, and inductance and resistance ratio are calculated, it is special to establish steel lining thickness-signal for as corresponding characteristic quantity
Matched curve between sign amount, as steel lining thickness-signal characteristic quantity calibration curve；
2) tested point is obtained by experiment and detects characteristic quantity: by the large container stainless steel lining Thickness sensitivity system based on EDDY CURRENT
System is disposed vertically in tested point steel lining side upper surface, and pressing probe protection shell (8), makes sandwich wound coil lower surface from top to bottom
It being completely attached to steel lining upper surface, application and identical sinusoidal excitation signal in step 1) obtain detection impedance signal, and
Calculate corresponding characteristic quantity；
3) it calculates tested point steel lining thickness value: in the resulting calibration curve of step 1), obtaining and characteristic quantity phase obtained by step 2)
Corresponding steel lining thickness value, as tested point steel lining thickness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811534534.7A CN109506558B (en) | 2018-12-14 | 2018-12-14 | System and method for thickness detection of stainless steel lining of large vessel based on eddy current detection |
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|---|---|---|---|
| CN201811534534.7A CN109506558B (en) | 2018-12-14 | 2018-12-14 | System and method for thickness detection of stainless steel lining of large vessel based on eddy current detection |
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| CN109506558B CN109506558B (en) | 2020-01-21 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112067689A (en) * | 2020-08-25 | 2020-12-11 | 南昌航空大学 | An interconnected differential welding seam eddy current detection sensor |
| CN112179261A (en) * | 2020-09-24 | 2021-01-05 | 桂林理工大学 | A detection method of rail decarburization layer thickness based on electromagnetic response |
| CN112946064A (en) * | 2021-02-03 | 2021-06-11 | 西安交通大学 | Passive excitation electromagnetic nondestructive detection system and detection method for high-speed train track |
| CN112946063A (en) * | 2021-02-03 | 2021-06-11 | 西安交通大学 | High-speed hub online electromagnetic detection system and detection method based on differential coil |
| CN114473843A (en) * | 2021-12-30 | 2022-05-13 | 清华大学 | A kind of metal film thickness measurement method and chemical mechanical polishing equipment |
| CN118010841A (en) * | 2024-02-23 | 2024-05-10 | 南昌航空大学 | Eddy current detection probe with self-adaptive curved surface fitting degree and adjusting method thereof |
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| CN112067689A (en) * | 2020-08-25 | 2020-12-11 | 南昌航空大学 | An interconnected differential welding seam eddy current detection sensor |
| CN112179261A (en) * | 2020-09-24 | 2021-01-05 | 桂林理工大学 | A detection method of rail decarburization layer thickness based on electromagnetic response |
| CN112179261B (en) * | 2020-09-24 | 2022-09-23 | 桂林理工大学 | A detection method of rail decarburization layer thickness based on electromagnetic response |
| CN112946064A (en) * | 2021-02-03 | 2021-06-11 | 西安交通大学 | Passive excitation electromagnetic nondestructive detection system and detection method for high-speed train track |
| CN112946063A (en) * | 2021-02-03 | 2021-06-11 | 西安交通大学 | High-speed hub online electromagnetic detection system and detection method based on differential coil |
| CN112946063B (en) * | 2021-02-03 | 2023-08-15 | 西安交通大学 | High-speed hub online electromagnetic detection system and detection method based on differential coil |
| CN112946064B (en) * | 2021-02-03 | 2024-04-02 | 西安交通大学 | Passive excitation electromagnetic nondestructive detection system and detection method for high-speed train track |
| CN114473843A (en) * | 2021-12-30 | 2022-05-13 | 清华大学 | A kind of metal film thickness measurement method and chemical mechanical polishing equipment |
| CN118010841A (en) * | 2024-02-23 | 2024-05-10 | 南昌航空大学 | Eddy current detection probe with self-adaptive curved surface fitting degree and adjusting method thereof |
| CN118010841B (en) * | 2024-02-23 | 2025-01-28 | 南昌航空大学 | A curved surface fitting adaptive eddy current detection probe and adjustment method thereof |
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