CN109506558B - Large container stainless steel lining thickness detection system and method based on eddy current detection - Google Patents
Large container stainless steel lining thickness detection system and method based on eddy current detection Download PDFInfo
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- CN109506558B CN109506558B CN201811534534.7A CN201811534534A CN109506558B CN 109506558 B CN109506558 B CN 109506558B CN 201811534534 A CN201811534534 A CN 201811534534A CN 109506558 B CN109506558 B CN 109506558B
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- 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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Abstract
A large container stainless steel lining thickness detection system and method based on eddy current detection, the detection system includes the probe of the disc coil and probe positioning auxiliary device, the disc coil can be used for exerting the exciting current and gathering and detecting the signal, the detected signal includes the thickness information of the stainless steel lining; the probe positioning auxiliary device can assist the probe in detection so as to eliminate the interference of the lifting and the deflection of the probe on a detection result; in the eddy current detection signal analysis method, firstly, a steel lining thickness-signal characteristic quantity calibration curve is determined based on different steel lining thickness standard samples, secondly, the signal characteristic quantity of a point to be measured is obtained through measurement of a detection system, and finally, a thickness value corresponding to the characteristic quantity obtained through an experiment is extracted based on the calibration curve, namely the thickness of the steel lining of the point to be measured; the detection system and the method can perform fixed-point nondestructive quantitative evaluation on the stainless steel lining of the large container, can eliminate the influence of lifting on the detection result in principle, and have the advantages of simple structure, convenient and quick operation, stable detection result, small related data amount, wide applicability and the like.
Description
Technical Field
The invention relates to the technical field of nondestructive evaluation of the thickness of a stainless steel lining of a large container, in particular to a system and a method for detecting the thickness of the stainless steel lining of the large container based on eddy current detection.
Background
Large-scale container base member is mostly steel material, because the environment of being in service is complicated changeable, in normal service process, often can receive the influence that the material corrodes (often in the container that contains chemical substance) etc., take the large-scale container that contains poison gas or liquid as the example, the destruction of the container body can lead to the inside hazardous materials of container to reveal, constitute very big threat to the security of the lives and properties, for avoiding the emergence of this type of accident, the inside stainless steel lining that adopts of container keeps apart the container base member with the environment mutually, thereby slow down or avoid the container body to take place destruction such as corruption. Although the stainless steel lining is difficult to corrode in a severe service environment compared with a steel container body, the stainless steel lining is inevitably damaged after being used for a long time, so that the influence of the environment on the container body cannot be safely isolated, and therefore, the thickness detection of the stainless steel lining of the container is critical regularly.
The most common method for evaluating the thickness of the container is ultrasonic detection, but the contact surface of the stainless steel liner of the large container and the container body is generally fixed by welding, the actual condition of the interface is relatively complex, and the ultrasonic detection technology mainly applies ultrasonic waves to evaluate the thickness of reflected wave information of the interface, thereby greatly restricting the application range of the ultrasonic detection technology. In addition, the ultrasonic detection technology must use a coupling agent, and the surface of the steel lining is directly exposed to the severe environment, so that the use of the coupling agent is inconvenient. The eddy current inspection technology can well avoid the above two problems, so that it is necessary to research a suitable eddy current inspection technology in order to more efficiently evaluate the thickness of the stainless steel lining of the large container.
Disclosure of Invention
The invention aims to provide a large container stainless steel lining thickness detection system and method based on eddy current detection, so that fixed-point quantitative evaluation is carried out on a large container stainless steel lining, the influence of lifting on a detection result can be eliminated in principle, and the large container stainless steel lining thickness detection system has the advantages of non-contact, simple structure, convenience and quickness in operation, stable detection result, small related data quantity and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a large container stainless steel lining thickness detection system based on eddy current detection comprises a disc type coil and a probe auxiliary device, wherein the disc type coil comprises a coil framework 1 and a disc type coil conducting wire wound on the coil framework 1, and the disc type coil conducting wire is led out from a coil framework conducting wire groove 2; the probe auxiliary device comprises a coil protective shell 3, a pin 5, a spring 7 and a probe protective shell 8, wherein the coil protective shell 3 is coated outside the coil framework 1, and the bottom end of the coil protective shell is fixed with the bottom end of the coil framework 1; the top end of the coil protecting shell 3 is provided with a lead positioning groove 6, and the side surface is provided with a pin hole 4; the spring 7 is arranged at the top of the coil protective shell 3, the probe protective shell 8 covers the spring 7 and the outside of the coil protective shell 3, a lead outlet 10 is formed in the top end of the probe protective shell 8, and a pin groove 9 is formed in the position, corresponding to the pin hole 4 in the side face of the coil protective shell 3, of the side face of the probe protective shell; the disc type coil lead led out from the coil framework lead groove 2 is led out from the center of the upper surface of the coil protective shell 3 through the lead positioning groove 6, passes through the axis of the spring 7 and is led out through the lead outlet hole 10; the utility model discloses a coil protection shell, including coil protection shell 3, pin 5, pin groove 9, pin hole 4, pin groove 9, the length of pin groove 9, coil protection shell 3 and coil skeleton 1 are all received the same pressure every time, in order to reach the purpose that the lift-off distance is the same in detecting at every turn, the pin 5 one end is fixed in pin hole 4, and the pin groove 9 is arranged in to coil protection shell 3 moves along the axis direction in probe protection shell 8, and the steerable coil protection shell of length of pin groove 9 moves the same distance every time, thereby guarantees that.
The disc coil wire is wound on the coil bobbin 1.
The thickness detection system of the large-scale container stainless steel lining based on eddy current detection is used for detecting the thickness of the large-scale container stainless steel lining,
1) establishing a steel lining thickness-signal characteristic quantity calibration curve: making a series of calibration pieces for establishing a steel lining thickness-signal characteristic quantity calibration curve, wherein compared with the thickness detection system, the size of a large container is very large, so that the area near a detection point can be regarded as a flat plate, and a calibration curve can be established based on the calibration pieces with a double-layer plate structure; these markers consist of two parts: the upper stainless steel layer and the lower carbon steel layer are steel linings, the carbon steel layer is a large container base body, the thickness of the carbon steel layer of each marking piece is the same, the thickness t of the stainless steel layer is different, t is more than or equal to 1mm and less than or equal to 4mm, a large container stainless steel lining thickness detection system based on eddy current detection is sequentially and vertically placed on the upper surface of one side of each marking piece steel lining, the probe protection shell 8 is pressed from top to bottom, the lower surface of the disc coil is completely contacted with the upper surface of the steel lining, the disc coil of the large container stainless steel lining thickness detection system based on eddy current detection is sequentially applied with completely same sine excitation signals, eddy currents can be induced in the stainless steel layer and the carbon steel layer, the eddy currents can excite a secondary magnetic field and influence disc coil impedance signals, and the thickness of the stainless steel lining can influence the strength and distribution of the secondary magnetic field due to the fact that the material parameters, particularly the relative permeability, of the stainless steel and the carbon steel are, further influencing impedance signals of the disc coil, detecting the thickness of the steel lining by characterizing the characteristic quantity of the impedance signals, collecting the detected impedance signals, calculating the ratio of inductance to resistance, namely corresponding characteristic quantity, and establishing a fitting curve between the thickness of the steel lining and the characteristic quantity of the signals, namely a calibration curve of the thickness of the steel lining and the characteristic quantity of the signals;
2) acquiring detection characteristic quantity of a point to be detected through an experiment: vertically placing a large container stainless steel lining thickness detection system based on eddy current detection on the upper surface of one side of a steel lining to be detected, pressing a probe protective shell 8 from top to bottom to enable the lower surface of a disc coil to be completely contacted with the upper surface of the steel lining, applying a sine excitation signal which is completely the same as that in the step 1), obtaining a detected impedance signal, and calculating a corresponding characteristic quantity;
3) calculating the thickness value of the steel lining of the point to be measured: and (3) acquiring a steel lining thickness value corresponding to the characteristic quantity obtained in the step 2) from the calibration curve obtained in the step 1), namely the thickness of the steel lining of the point to be measured.
Compared with the prior art, the invention has the following advantages:
1) the invention can carry out fixed-point quantitative detection on the thickness of the stainless steel lining of the large container, has simple detection system and convenient and quick operation, can make up the defects that the ultrasonic detection technology is greatly influenced by interfaces and needs a coupling agent, and can greatly improve the detection efficiency.
2) The invention adopts the probe auxiliary device, can enable the disc coil to be subjected to the same pressure in each detection through the auxiliary action of the internal spring and other parts, further can eliminate the influence of the lifting distance on the detection result in principle, and has the advantages of stable detection result, small related data quantity and the like.
Drawings
FIG. 1 is a schematic structural diagram of the probe auxiliary device of the present invention.
FIG. 2 is a schematic diagram of the relative position between the coil bobbin and the protective casing of the coil probe according to the present invention.
FIG. 3 is a schematic diagram of the connection between the coil protective casing and the probe protective casing according to the present invention.
FIG. 4 is a calibration curve of steel lining thickness-signal characteristic quantity established by the embodiment of the invention.
Detailed Description
The detection principle of the method is as follows: according to the eddy current detection principle, when a sinusoidal excitation signal with a certain frequency is applied to the disc coil, eddy currents can be induced in the steel lining layer and the container base body layer, the eddy currents can excite a secondary magnetic field and influence the disc coil impedance signal, and because the material parameters (particularly the relative permeability) of the stainless steel and the carbon steel are greatly different, the thickness of the steel lining can influence the strength and the distribution of the secondary magnetic field and further influence the impedance signal of the disc coil, the thickness of the steel lining can be detected by representing the characteristic quantity of the impedance signal. Through numerical simulation and experiment, the following results are found: under the same steel lining thickness, the ratio of the imaginary part and the real part of the impedance signal detected by the disc type coil and the steel lining thickness have a quadratic function relationship, so that the ratio can be used as the characteristic quantity for representing the steel lining thickness, and a steel lining thickness-signal characteristic quantity curve is established. In addition, the probe auxiliary device can ensure that the spring 7 generates the same deformation in each detection, and the pressure received by the disc coil is the same at each time according to Hooke's law, so that the lifting distance of the probe in each detection can be controlled to be the same, namely, the adverse effect of the lifting distance on the detection result is eliminated in principle.
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the present embodiment is a large container stainless steel lining thickness detection system based on eddy current detection, which includes a disc coil and a probe auxiliary device, wherein, in the disc coil, a wire wound on a coil frame 1 is led out from a coil frame wire groove 2; the probe auxiliary device comprises a coil protective shell 3, a pin 5, a spring 7 and a probe protective shell 8; the top end of the coil protecting shell 3 is provided with a lead positioning groove 6, and the side surface is provided with a pin hole 4; the top end of the probe protective shell 8 is provided with a wire outlet 10, and the side surface is provided with a pin groove 9.
As shown in fig. 2, the bottom end of the coil protecting casing 3 is fixed to the coil frame 1, so as to ensure that the coil casing 3 and the coil frame 1 can move synchronously, and when the coil protecting casing 3 is under pressure, the coil frame 1 is under the same pressure. The disc type coil wire can be led out from the coil framework wire groove 2, passes through the wire positioning groove 6 and is led out from the center of the upper surface of the coil protection shell 3.
As shown in fig. 3, the coil protection case 3 is connected to the side of the probe protection case 8 by a pin 5. One end of the pin 5 is fixed in the pin hole 4, and the other end is arranged in the pin groove 9, so that the coil protective shell 3 and the pin 5 can move relatively along the axial direction of the probe protective shell 8; the spring 7 is arranged at the top of the coil protection shell 3; the spring 7 and the coil protective shell 3 are arranged inside the probe protective shell 8; the lead led out from the lead positioning groove 6 can pass through the axis of the spring 7 and then is led out of the probe from the lead outlet hole 10.
The thickness detection method of the large container stainless steel lining thickness detection system based on eddy current detection comprises the following steps:
1) and establishing a steel lining thickness-signal characteristic quantity calibration curve. 4 calibrating pieces used for establishing a steel lining thickness-signal characteristic quantity calibration curve are manufactured, compared with the thickness detection system, the size of a large container is very large, so that the area near a detection point can be regarded as a flat plate, and the calibration curve can be established based on the calibrating pieces with a double-layer plate structure; these markers consist of two parts: the method comprises the following steps that a stainless steel layer on the upper layer and a carbon steel layer on the lower layer are respectively a steel lining, the carbon steel layer is a large container base body, a large container stainless steel lining thickness detection system based on eddy current detection is sequentially and vertically placed on the upper surface of one side of each calibration piece steel lining, a probe protective shell 8 is pressed from top to bottom, the lower surface of a disc type coil is enabled to be completely contacted with the upper surface of the steel lining, constant-current excitation signals with the frequency of 30kHz and the size of 20mA are sequentially applied to the disc type coil of each large container stainless steel lining thickness detection system based on eddy current detection, detected impedance signals are collected, the ratio of inductance and resistance is calculated to be corresponding characteristic quantity, the specific size and characteristic quantity of the calibration piece are shown in table 1, a steel lining thickness-signal characteristic quantity calibration curve is established, and the expression is shown in figure 4:
TABLE 1 structural parameters of the calibration piece
2) And acquiring detection characteristic quantity of the point to be detected through experiments. Vertically placing a large container stainless steel lining thickness detection system based on eddy current detection on the upper surface of one side of a steel lining to be detected, pressing a probe protective shell 8 from top to bottom to enable the lower surface of a disc coil to be completely contacted with the upper surface of the steel lining, applying a sine excitation signal which is completely the same as that in the step 1), obtaining a detected impedance signal, and calculating a corresponding characteristic quantity;
3) and calculating the thickness value of the steel lining of the point to be measured. In the calibration curve obtained in the step 1), the thickness value of the steel lining corresponding to the characteristic quantity obtained in the step 2) is obtained, namely the thickness of the steel lining of the point to be measured, and the real values, the detection values and the relative errors of the thicknesses of the stainless steel linings of the three points to be measured are shown in the table 2.
TABLE 2 test results of the thickness of the steel lining at the point to be tested
As can be seen from the test results in Table 2, the detection error is within the allowable range, thereby proving the feasibility of the detection system.
Claims (2)
1. A method for detecting the thickness of a stainless steel lining of a large container based on eddy current detection comprises a disc coil and a probe auxiliary device, wherein the disc coil comprises a coil framework (1) and a disc coil lead wound on the coil framework (1), and the disc coil lead is led out from a coil framework lead groove (2); the probe auxiliary device comprises a coil protective shell (3), a pin (5), a spring (7) and a probe protective shell (8), wherein the coil protective shell (3) is coated outside the coil framework (1), and the bottom end of the coil protective shell is fixed with the bottom end of the coil framework (1); the top end of the coil protective shell (3) is provided with a lead positioning groove (6), and the side surface is provided with a pin hole (4); the spring (7) is arranged at the top of the coil protective shell (3), the probe protective shell (8) is coated outside the spring (7) and the coil protective shell (3), a lead outlet hole (10) is formed in the top end of the probe protective shell (8), and a pin groove (9) is formed in the position, corresponding to the pin hole (4) in the side face of the coil protective shell (3), of the side face of the probe protective shell; the disc type coil wire led out from the coil framework wire groove (2) is led out from the center of the upper surface of the coil protective shell (3) through a wire positioning groove (6), passes through the axis of the spring (7) and is led out through a wire outlet hole (10); one end of the pin (5) is fixed in the pin hole (4), the other end of the pin is arranged in the pin groove (9), so that the coil protective shell (3) moves in the probe protective shell (8) along the axis direction, and the length of the pin groove (9) can control the coil protective shell (3) to move the same distance every time, thereby ensuring that the coil protective shell (3) and the coil framework (1) are subjected to the same pressure every time, and achieving the purpose of the same lifting distance in every detection;
the method is characterized in that: the method for detecting the thickness of the stainless steel lining of the large container comprises the following steps:
1) establishing a steel lining thickness-signal characteristic quantity calibration curve: manufacturing a series of calibration pieces for establishing a steel lining thickness-signal characteristic quantity calibration curve, wherein compared with the thickness detection system, the size of a large container is very large, so that the area near a detection point can be regarded as a flat plate, and the calibration curve is established based on the calibration pieces with a double-layer plate structure; these markers consist of two parts: the upper stainless steel layer and the lower carbon steel layer are steel linings, the stainless steel layer is a large container base body, the thickness of the carbon steel layer of each standard piece is the same, the thickness t of the stainless steel layer is different, t is more than or equal to 1mm and less than or equal to 4mm, a large container stainless steel lining thickness detection system based on eddy current detection is sequentially and vertically placed on the upper surface of one side of each standard piece steel lining, a probe protection shell (8) is pressed from top to bottom, the lower surface of a disc coil is completely contacted with the upper surface of the steel lining, and for each large container stainless steel lining based on eddy current detectionThe disc coil of the thickness detection system applies completely same sinusoidal excitation signals in sequence, eddy currents can be induced in the stainless steel layer and the carbon steel layer, the eddy currents can excite a secondary magnetic field and affect impedance signals of the disc coil, and due to the fact that material parameters, particularly relative permeability, of the stainless steel and the carbon steel have large difference, the thickness of the stainless steel lining can affect strength and distribution of the secondary magnetic field and further affect impedance signals of the disc coil, the thickness of the steel lining is detected by representing characteristic quantities of the impedance signals, the impedance signals are collected and detected, and the ratio of inductance to resistance is calculated
Establishing a fitting curve between the thickness of the steel lining and the signal characteristic quantity, namely a calibration curve of the thickness of the steel lining and the signal characteristic quantity, wherein the fitting curve is the corresponding characteristic quantity;
2) acquiring detection characteristic quantity of a point to be detected through an experiment: vertically placing a large container stainless steel lining thickness detection system based on eddy current detection on the upper surface of one side of a steel lining to be detected, pressing a probe protective shell (8) from top to bottom to enable the lower surface of a disc coil to be completely contacted with the upper surface of the steel lining, applying a sine excitation signal which is completely the same as that in the step 1), obtaining a detected impedance signal, and calculating corresponding characteristic quantity;
3) calculating the thickness value of the steel lining of the point to be measured: and (3) acquiring a steel lining thickness value corresponding to the characteristic quantity obtained in the step 2) from the calibration curve obtained in the step 1), namely the thickness of the steel lining of the point to be measured.
2. The method of claim 1, wherein: the disc type coil conducting wire is wound on the coil framework (1).
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