CN112834611A - Variable-diameter differential eddy current sensor detection method and device - Google Patents
Variable-diameter differential eddy current sensor detection method and device Download PDFInfo
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- CN112834611A CN112834611A CN202110090150.6A CN202110090150A CN112834611A CN 112834611 A CN112834611 A CN 112834611A CN 202110090150 A CN202110090150 A CN 202110090150A CN 112834611 A CN112834611 A CN 112834611A
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- 238000001514 detection method Methods 0.000 title claims abstract description 118
- 230000005489 elastic deformation Effects 0.000 claims abstract description 41
- 239000002184 metal Substances 0.000 claims abstract description 41
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 5
- 238000009659 non-destructive testing Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 39
- 238000007689 inspection Methods 0.000 description 9
- 239000000523 sample Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
Abstract
The invention relates to a detection method and a device of a variable-diameter differential eddy current sensor, which are used for nondestructive detection of a metal pipeline (1), are connected to a detection instrument (12) through a lead (11), and comprise an elastic deformation support frame (2) and an eddy current detection coil (3), and are characterized in that the elastic deformation support frame (2) is arranged into an expandable and contractible cylinder structure, and the eddy current detection coil (3) is wound on the cylinder-shaped outer surface of the elastic deformation support frame (2); the eddy current detection coil (3) is a pair of differential in-penetration type eddy current sensor coils formed by winding an elastic stretchable flexible lead (31). The problem that metal pipes with different shapes, different diameters and different sizes cannot be effectively detected at one time in eddy current detection is well solved.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to a sensor device and a detection method technology for eddy current testing of a metal pipeline, and particularly relates to a variable-diameter differential eddy current sensor detection method and a variable-diameter differential eddy current sensor detection device.
Background
In modern industrial production, various in-service metal pipelines are applied in various fields. Especially, heat exchanger pipelines in the fields of nuclear power, electric power, petrochemical industry, special equipment and the like have important safety requirements. Therefore, at intervals, or in the event of an abnormal situation, nondestructive testing is necessary to investigate the potential safety hazard. For most thin-wall and nonferrous metal pipes, the discontinuity detection by the eddy current method is the best choice. The eddy current method does not need a coupling agent, and has high efficiency and high sensitivity.
However, in reality, some pipes need to be bent and expanded to some extent during design and installation, which results in deformation of the cross section. Therefore, the inside-outside penetration type, differential probe (or sector probe dedicated to external inspection, etc.) used for the conventional eddy current cannot perform effective inspection at the changed cross section of the pipe. In general, the probe (sensor) of the corresponding size and specification must be replaced, so that the convenience of operation and application in engineering is affected. And if the array eddy current sensor is used for manufacturing a flexible probe, the cost is high, and the use is not ideal.
Aiming at the problems of the defects, the invention adopts the following technical scheme to improve.
Disclosure of Invention
The invention aims to provide a detection method and a device for a variable-diameter eddy current detection sensor, and the technical scheme is as follows:
a diameter-variable differential eddy current sensor detection device is used for nondestructive detection of a metal pipeline (1), is connected to a detection instrument (12) through a lead (11), and comprises an elastic deformation support frame (2) and an eddy current detection coil (3), and is characterized in that the elastic deformation support frame (2) is arranged into an expandable and contractible cylinder structure, and the eddy current detection coil (3) is wound on the cylinder-shaped outer surface of the elastic deformation support frame (2); the eddy current detection coil (3) is a pair of differential in-penetration type eddy current sensor coils formed by winding an elastic stretchable flexible lead (31).
And the flexible lead (31) is provided with nano conductive powder (312) wrapped by an elastic flexible layer (311) on the outside.
And the elastic deformation support frame (2) is arranged in a manner that a flexible soft magnetic layer (21) is internally wrapped with a deformable filling layer (22), and the deformable filling layer (22) is arranged in a manner of liquid, sponge or air bag. The elastic deformation support frame (2) is also provided with a nano permanent magnet particle layer (23) attached to the surface of the flexible soft magnetic layer (21).
The variable-diameter differential eddy current sensor detection device is characterized in that an elastic deformation support frame (2) and an eddy current detection coil (3) are matched and are formed by sleeving two or more same body structures with different sizes inside and outside.
Wherein, the device also comprises a selection switch for selecting the eddy current detection coils (3) with different sizes as detection results. The elastic deformation of the elastic deformation support frame (2) has limit, the extension of the eddy current detection coil (3) also has limit, the expansion volume range value of the elastic deformation support frame (2) is designed in the elastic extension limit value range of the elastic deformation support frame (2) and the eddy current detection coil (3), and the detection device can be suitable for detecting more metal pipelines with different pipe diameters by selecting multiple layers of volumes and coil diameters with different sizes.
When the deformable filling layer (22) is arranged into an air bag type structure, an air pressure adjusting device (5) can be further arranged, and the expansion and contraction of the air bag type deformable filling layer (22) can be adjusted by increasing or decreasing air through an air pipe (51). When two or more than two air bag type deformable filling layers (22) with the same body structure body with different sizes are sleeved inside and outside, each air bag is provided with an independent air pipe (51) for adjusting air pressure, and the volume of each deformable filling layer (22) is adjusted independently.
In another structure mode, more than two layers of sleeved elastic deformation support frames (2) are structurally matched with a pair of eddy current detection coils (3) arranged on the outermost layer of elastic deformation support frame (2).
The invention also discloses a variable-diameter differential eddy current sensor detection method, which uses the detection sensor device and comprises the following specific steps:
a. elastic expansion and stretching adjustment: according to metal pipeline detection objects with different shapes and diameters, an elastic deformation support frame and an eddy current detection coil of the eddy current sensor device are expanded and stretched to be proper in diameter by adjusting a deformable filling layer;
b. nondestructive testing of the metal tube: carrying out movement detection on the wall of the metal pipeline by using the eddy current detection sensor device with the well adjusted expansion and stretching;
c. differential analysis of detection data: and analyzing the detection results of the pair of differential eddy current detection coils, comparing the impedance values of the two coils, and analyzing the defect parameters of the metal pipeline.
Before the elastic expansion and stretching adjustment in the step a, the selection of an elastic deformation support frame layer is further included, according to metal pipe detection objects with different sizes and shapes, a layer of elastic deformation support frame and an eddy current detection coil, the elastic deformation support frame and the eddy current detection coil, the elastic limit range value of which is suitable for the metal pipe diameter, are selected from the eddy current detection sensor devices of a plurality of identical body structural bodies with different sizes and shapes for detection, the body is expanded and stretched to the maximum limit diameter by being smaller than the selected layer of elastic deformation support frame and the selected eddy current detection coil, and the elastic deformation support frame and the eddy current detection coil, the body of which is larger than the selected layer.
And in the detection data differential analysis, selecting an eddy current detection coil of the eddy current sensor detection device, and selecting corresponding data detected by a pair of differential eddy current detection coils according to the selected elastic deformation support frame for analysis.
According to the technical scheme, the invention has the following beneficial effects:
the invention adopts the elastic conductive wire and utilizes the materials of sponge or air bag and the like to manufacture the deformable vortex internal and external through type or fan-shaped special deformable sensor, thereby better solving the problem that the metal pipes with different shapes and diameters can not be effectively detected at one time in the vortex detection.
The key point of the invention is that nano metal (or conductive) powder is wrapped by colloidal outside to be made into a stretchable wire, and an eddy current coil is wound, thereby realizing the purpose expected by the invention.
The invention is generally used for differential eddy current in-service detection because the diameter of the coil is increased or decreased along with the constraint condition of the internal space of the pipeline. The high-pass filter in the instrument is utilized to remove gradual noise generated by deformation of the coil body, so that the purpose of detecting defects such as tube wall holes and holes is achieved.
The invention applies the method for analyzing the detection coil of the differential internal penetration type eddy current flexible sensor, is more suitable for the method for detecting and analyzing the tensile change of the coil diameter, and realizes the accurate detection data analysis.
Drawings
FIG. 1a is a schematic view of the inspection of the metal pipe according to the preferred embodiment of the present invention;
FIG. 1b is a schematic view of the inspection apparatus according to the preferred embodiment of the present invention;
FIG. 1c is a schematic view of the inspection state of the fan-shaped metal tube according to the preferred embodiment of the present invention;
FIG. 2 is a schematic view of the inspection of the probe inserted into the metal tube according to the preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a dual layer eddy current test sensor assembly in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a three-layer eddy current test sensor assembly in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of an eddy current test sensor assembly with a pair of eddy current test coils in a three-layer deformable filler layer in accordance with a preferred embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of the flexible lead according to the preferred embodiment of the present invention;
FIG. 7 is a schematic sectional view of the elastically deformable supporting frame according to the preferred embodiment of the present invention;
FIG. 8 is a schematic view of the inspection tool set outside the metal tube according to the preferred embodiment of the present invention;
FIG. 9 is a perspective view of the inspection apparatus of the present invention mounted outside the metal tube;
FIG. 10 is a schematic view of a double-layered structure for detecting the outer surface of a metal tube according to the preferred embodiment of the present invention;
FIG. 11 is a schematic view of a three-layer structure of the inspection tool set outside a metal tube according to the preferred embodiment of the present invention; (ii) a
FIG. 12 is a schematic view of a detection device with permanent magnet layer sleeved outside a metal tube according to the preferred embodiment of the present invention;
FIG. 13 is a perspective view of a fan-shaped eddy current test sensor assembly in accordance with a preferred embodiment of the present invention;
FIG. 14 is a flow chart of a detection method according to the preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
The detection device of the invention, as shown in the using state diagrams of fig. 1a to fig. 1c, is a variable-diameter differential eddy current sensor detection device, is used for nondestructive detection of a metal pipeline 1, is connected to a detection instrument 12 through a lead 11, and comprises three detection device structures, namely, an inner inserted metal pipe detection device, an outer penetrated metal pipe detection device and a fan-shaped wrapped metal pipe detection device.
As shown in fig. 2 to 5, the eddy current sensor detecting device includes an elastically deformable supporting frame 2 and an eddy current detecting coil 3, and is characterized in that the elastically deformable supporting frame 2 is configured as an expandable and contractible cylinder structure, and the eddy current detecting coil 3 is wound on the cylinder outer surface of the elastically deformable supporting frame 2; the eddy current detecting coil 3 is a pair of differential in-passing eddy current sensor coils formed by winding an elastically stretchable flexible wire 31.
And as shown in fig. 6, the flexible conductor 31 is configured as a nano conductive powder 312 with an elastic flexible layer 311 wrapped outside.
And as shown in fig. 7, 9, 12 and 13, the elastically deformable support frame 2 is configured such that a deformable filling layer 22 is wrapped inside a flexible soft magnetic layer 21, and the deformable filling layer 22 is configured as one of a liquid, a sponge or an air bag. The elastically deformable support frame 2 is further provided with a layer 23 of nano-permanent magnet particles attached to the surface of the flexible soft-magnetic layer 21.
As shown in the multilayer ellipsoidal structure shown in fig. 3, fig. 4 and fig. 5 and the multilayer annular cylindrical structure shown in fig. 9, fig. 10 and fig. 11, a diameter-variable differential eddy current sensor detection device is formed by sleeving two or more identical ellipsoidal structures with different sizes inside and outside in a matched manner, wherein an elastically deformable support frame 2 and an eddy current detection coil 3 are arranged in a matched manner. The eddy current detection coils 3 may be provided in pairs with the elastically deformable support frames 2, or as shown in fig. 5, a pair of differential eddy current detection coils 3 may be shared by all the elastically deformable support frames 2.
Wherein, the device also comprises a selector switch for selecting the eddy current detection coils 3 with different sizes as the detection result. The elastic deformation of the elastic deformation support frame 2 has limit, the extension of the eddy current detection coil (3) also has limit, the expansion volume range value of the elastic deformation support frame 2 is designed in the elastic extension limit value range of the elastic deformation support frame 2 and the eddy current detection coil 3, and the detection device can be suitable for detecting more metal pipelines with different pipe diameters by selecting multiple layers of volumes and coil diameters with different sizes.
As shown in fig. 3, 4, 10 and 11, when the deformable filling layer 22 is provided as an air bag structure, an air pressure adjusting device 5 may be further provided to increase or decrease the expansion and contraction of the air bag type deformable filling layer 22 through an air tube 51. When two or more than two air bags of the same body structure body with different sizes are sleeved inside and outside the deformable filling layer 22, each air bag is provided with an independent air pipe 51 for adjusting air pressure, and the volume of each deformable filling layer 22 is adjusted independently.
In another structure, more than two layers of elastic deformation support frames 2 which are sleeved with each other are structurally matched with a pair of eddy current detection coils 3 arranged on the outermost layer of elastic deformation support frame 2.
As shown in the flowchart of fig. 14, the present invention further discloses a variable diameter differential eddy current sensor detection method, which uses the detection sensor device described above, and the specific method steps are as follows:
a. elastic expansion and stretching adjustment: according to metal pipeline detection objects with different shapes and diameters, an elastic deformation support frame and an eddy current detection coil of the eddy current sensor device are expanded and stretched to be proper in diameter by adjusting a deformable filling layer;
b. nondestructive testing of the metal tube: carrying out movement detection on the wall of the metal pipeline by using the eddy current detection sensor device with the well adjusted expansion and stretching;
c. differential analysis of detection data: and analyzing the detection results of the pair of differential eddy current detection coils, comparing the impedance values of the two coils, and analyzing the defect parameters of the metal pipeline.
Before the elastic expansion and stretching adjustment in the step a, the selection of an elastic deformation support frame layer is further included, according to metal pipe detection objects with different sizes and shapes, a layer of elastic deformation support frame and an eddy current detection coil, the elastic deformation support frame and the eddy current detection coil, the elastic limit range value of which is suitable for the metal pipe diameter, are selected from the eddy current detection sensor devices of a plurality of identical body structural bodies with different sizes and shapes for detection, the body is expanded and stretched to the maximum limit diameter by being smaller than the selected layer of elastic deformation support frame and the selected eddy current detection coil, and the elastic deformation support frame and the eddy current detection coil, the body of which is larger than the selected layer.
And in the detection data differential analysis, selecting an eddy current detection coil of the eddy current sensor detection device, and selecting corresponding data detected by a pair of differential eddy current detection coils according to the selected elastic deformation support frame for analysis.
The above is one embodiment of the present invention. Furthermore, it is to be understood that all equivalent or simple changes in the structure, features and principles described in the present patent concepts are included in the scope of the present patent.
Claims (10)
1. A diameter-variable differential eddy current sensor detection device is used for nondestructive detection of a metal pipeline (1), is connected to a detection instrument (12) through a lead (11), and comprises an elastic deformation support frame (2) and an eddy current detection coil (3), and is characterized in that the elastic deformation support frame (2) is arranged into an expandable and contractible cylinder structure, and the eddy current detection coil (3) is wound on the cylinder-shaped outer surface of the elastic deformation support frame (2);
the eddy current detection coil (3) is a pair of differential in-penetration type eddy current sensor coils formed by winding an elastic stretchable flexible lead (31).
2. The variable diameter differential eddy current sensor testing device as claimed in claim 1, wherein the flexible conductive wire (31) is configured as nano conductive powder (312) with an outer elastic flexible layer (311) wrapping.
3. A variable diameter differential eddy current sensor testing device as claimed in claim 1, wherein the elastically deformable support frame (2) is configured to encapsulate a deformable filler layer (22) within a flexible soft magnetic layer (21), the deformable filler layer (22) being configured as one of a liquid, a sponge or a balloon.
4. A variable diameter differential eddy current sensor testing device as claimed in claim 3, characterized in that the elastically deformable support frame (2) is further provided with a layer of nano permanent magnet particles (23) attached to the surface of the flexible soft magnetic layer (21).
5. The variable-diameter differential eddy current sensor detection device according to claim 1, 2, 3 or 4, wherein the elastically-deformable support frame (2) and the eddy current detection coil (3) are configured to be formed by sleeving two or more same body structures with different sizes inside and outside.
6. A variable diameter differential eddy current sensor testing device according to claim 5, characterized by further comprising a selection switch for selecting different sizes of eddy current detection coils (3) as the testing result.
7. The variable-diameter differential eddy current sensor detection device according to claim 5, wherein more than two layers of sleeved elastic deformation support frames (2) are structurally matched with a pair of eddy current detection coils (3) arranged on the outermost layer of elastic deformation support frame (2).
8. A method for testing a variable-diameter differential eddy current sensor, which uses the testing sensor device as claimed in any one of claims 1 to 6, and comprises the following steps:
a. elastic expansion and stretching adjustment: according to metal pipeline detection objects with different shapes and diameters, an elastic deformation support frame and an eddy current detection coil of the eddy current sensor device are expanded and stretched to be proper in diameter by adjusting a deformable filling layer;
b. nondestructive testing of the metal tube: carrying out movement detection on the wall of the metal pipeline by using the eddy current detection sensor device with the well adjusted expansion and stretching;
c. differential analysis of detection data: and analyzing the detection results of the pair of differential eddy current detection coils, comparing the impedance values of the two coils, and analyzing the defect parameters of the metal pipeline.
9. The method according to claim 8, wherein before the elastic expansion and stretching adjustment in step a, the method further comprises selecting a layer of elastically deformable support frames, and selecting a layer of elastically deformable support frames and eddy current detection coils having elastic limit ranges suitable for the metal pipe diameter from among a plurality of eddy current detection sensor devices of the same body structure of different sizes according to the metal pipe detection objects of different sizes and shapes, wherein the body is smaller than the selected layer of elastically deformable support frames and eddy current detection coils and is stretched to the maximum limit diameter, and the body is larger than the selected layer of elastically deformable support frames and eddy current detection coils and is reduced to the minimum diameter.
10. The method according to claim 9, further comprising selecting the eddy current detection coils of the eddy current sensor testing apparatus, and selecting a corresponding pair of differential eddy current detection coils for analysis according to the selected elastically deformable support frame.
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