CN215218671U - External-through type elastic array coil eddy current detection probe - Google Patents
External-through type elastic array coil eddy current detection probe Download PDFInfo
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- CN215218671U CN215218671U CN202023115463.2U CN202023115463U CN215218671U CN 215218671 U CN215218671 U CN 215218671U CN 202023115463 U CN202023115463 U CN 202023115463U CN 215218671 U CN215218671 U CN 215218671U
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Abstract
The utility model discloses an outer formula elasticity array coil eddy current testing probe of wearing, including elasticity array coil eddy current probe and the elasticity axle around formula coil eddy current probe that links together. The elastic array coil eddy current probe is of a columnar through hole structure. The elastic axis-wound coil eddy current probe is of a cylindrical through hole structure. The beneficial effects are that: the qualitative and three-dimensional shape reappearance of the defects discovered by the eddy current probe which externally passes through the elastic shaft-wound coil is carried out, so that a basis is better provided for the reason analysis of the defects.
Description
Technical Field
The utility model belongs to the nondestructive test field of small pipe diameter tubular product or rod, concretely relates to outer formula elasticity array coil eddy current testing probe that passes.
Background
At present, a small-caliber pipe or bar generally uses an externally-penetrating type axial-winding probe to implement eddy current detection due to the structural characteristics of the pipe or bar, the method can only detect the size and the position of a defect, the property and the three-dimensional appearance of the defect cannot be determined, meanwhile, due to the influence of the end effect of the pipe (bar), an end blind area can occur, the risk of missed detection near the end exists, and the detection probe has certain limitation. Taking a nuclear power plant fuel rod as an example, the nuclear power plant fuel rod is formed by wrapping nuclear fuel in a zirconium alloy cladding with the wall thickness of about 0.5 mm, and welding and sealing are respectively carried out by adding a plug at each end, so that the nuclear power plant fuel rod is a first safety barrier for preventing nuclear leakage, and the inspection of an outer cladding is particularly important. Because the fuel rod can only be detected from the outside, the eddy current detection is mainly carried out at home and abroad by adopting an externally-penetrated axial-wound coil probe at present, the position and the size of the defect can be found by the technology, but the found defect cannot be qualitatively (such as crack, abrasion and the like). With the gradual maturity of the eddy current array technology, an external-through elastic array coil eddy current detection probe is developed on the basis of the array technology, qualitative analysis can be carried out on defects generated by a fuel rod, corresponding measures are made to avoid secondary damage of a fuel assembly due to the same reason, and safety and reliability of the fuel assembly during operation are guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an outer formula of passing elasticity array coil eddy current testing probe to the defect that externally passes elasticity axle winding coil eddy current probe and discover carries out qualitative and three-dimensional appearance reappearance, thereby better provides the foundation for the reason analysis of defect.
The technical scheme of the utility model as follows: an external penetration type elastic array coil eddy current detection probe comprises an elastic array coil eddy current probe and an elastic axial winding type coil eddy current probe which are connected together.
The elastic array coil eddy current probe is of a columnar through hole structure.
The elastic axis-wound coil eddy current probe is of a cylindrical through hole structure.
The elastic array coil eddy current probe comprises a shell, an array framework and an array sliding block are arranged in the shell and fixedly connected, a through hole is formed in the middle of the array sliding block, a coil is arranged in the middle of the array sliding block, a ferrite magnetic core is fixed in the middle of the coil, and an annular spring is sleeved on the periphery of the array sliding block.
The shell is of a hollow cylindrical structure.
The middle parts of the array frameworks are all provided with through holes.
The array framework is fixedly connected with the array sliding blocks.
The beneficial effects of the utility model reside in that: the ferrite magnetic core is arranged in the center of the small-diameter flat coil and then is arranged in the array sliding block together to form a detection unit, and the detection unit has high detection sensitivity on the surface and the inner surface of a detected pipe (or bar) and can effectively reduce the influence of an end effect. A plurality of detecting element install in the spout of array slider, the spout of array slider adopts the arrangement structure of two-layer dislocation, and every layer is arranged 6 detecting element, and two-layer totally 12 can densely cover in the circumference position of examined tubular product (or rod). Annular spring installs in the recess of array skeleton, and annular spring produces pressure and makes the array slider pop out and laminate with examined tubular product (or rod) surface, makes the filling rate of array coil reach 100%, guarantees the stability that the array coil detected, if there is deformation or swelling deformation such as examined tubular product (or rod), the array slider can be along with deformation or swelling shrink freely and laminate with the surface all the time, effectively prevents the risk that the probe blocked.
Drawings
Fig. 1 is a schematic view of an external penetration type elastic array coil eddy current inspection probe provided by the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a side sectional view of FIG. 1;
FIG. 4 is a partial cross-sectional view of FIG. 1;
fig. 5 is a partial cross-sectional view of fig. 1.
In the figure: the device comprises a tested pipe 1, an elastic array coil eddy current probe 2, an elastic axial winding type coil eddy current probe 3, a shell 21, an array framework 22, a ring spring 23, an array sliding block 24, a coil 25 and a ferrite magnetic core 26.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses an outer formula elastic array coil eddy current probe of wearing, it detects fastly, and sensitivity is high, can carry out qualitative to the defect type, and the array coil that also can equally divide according to each circumference forms the three-dimensional appearance of defect. The probe adopts an innovative structural design, improves the filling coefficient of the probe, and avoids the blocking risk caused by structural changes such as deformation or swelling and the like in the inspection process. The structural principle of the externally-worn elastic array coil eddy current probe is that a plurality of flat coils simultaneously detect the outer surface of a pipe (or a bar), the flat coils are distributed in an array mode at the circumferential position of the pipe (or the bar) and are tangent to the outer surface of the pipe (or the bar), and the filling rate at the tangent position can reach 100%. The flat coil adopts a flat structure with a very small diameter, the influence of the internal structure of a pipe (or a bar) on an eddy current signal can be eliminated, and the ferrite magnetic core is added in the center of the flat coil to focus the eddy current signal, so that the influence of the end effect of the coil is reduced. The utility model discloses can implement simultaneously with outer wear formula elasticity axle around formula coil eddy current probe, carry out the full coverage to tubular product (or rod) and detect, compensate the tradition and passed the weak point of axle around formula coil probe outward.
As shown in fig. 1, an external penetration type elastic array coil eddy current testing probe comprises an elastic array coil eddy current probe 2 and an elastic axis winding type coil eddy current probe 3, wherein the elastic array coil eddy current probe 2 and the elastic axis winding type coil eddy current probe 3 are connected together and are of a cylindrical through hole structure, and a pipe 1 to be tested penetrates through a through hole in the middle of the elastic array coil eddy current probe 2 and the elastic axis winding type coil eddy current probe 3.
As shown in fig. 2-4, the elastic array coil eddy current probe 2 includes a hollow cylindrical housing 21, an array skeleton 22 and array sliders 24 are installed in the housing 21, through holes are formed in the middle of the array skeleton 22, the array skeleton 22 is fixedly connected with the array sliders 24, the number of the array sliders 24 in this embodiment is 12, a coil 25 is provided in the middle of the array slider 24, a ferrite core 26 is fixed in the middle of the coil 25, and a ring-shaped spring 23 is sleeved on the periphery of the array slider 24.
The utility model has the characteristics of as follows:
the detection sensitivity of the pipe (or the bar) is improved by adopting the small-diameter flat coil and the ferrite magnetic core, the influence of an eddy edge signal at the end part is reduced, and the full coverage of an eddy current detection area of the pipe (or the bar) is realized by combining an external-penetrating elastic coil eddy current probe.
The arrangement mode of small-diameter coils and multilayer dislocation is adopted, the number of layers is different according to the outer diameter of a pipe (or a bar), the flat coil array needs to be densely distributed at the circumferential position of a detected object, the detection sensitivity is improved, and the diameter of the coil is smaller than 2 mm.
The elastic structure is adopted to ensure that the filling rate of the array coil reaches 100 percent, and the blocking risk caused by the structural deformation of the pipe (or bar) can be effectively avoided.
The external-through type elastic array coil eddy current probe is fixed on a specific inspection device and is connected to an eddy current instrument through an extension cable, one end of a pipe (or bar) to be inspected penetrates through the axial position of a central hole of the external-through type elastic array coil eddy current probe at a constant speed, at the moment, the array framework drives the flat coil to expand along the radial direction and is tightly attached to the outer surface of the pipe (or bar) to be inspected under the action of the annular spring, and therefore the defect of the pipe (or bar) to be inspected is inspected.
Claims (6)
1. The utility model provides an outer formula elasticity array coil eddy current testing probe that wears which characterized in that: the device comprises an elastic array coil eddy current probe and an elastic axial winding coil eddy current probe which are connected together; the elastic array coil eddy current probe comprises a shell, an array framework and an array sliding block are arranged in the shell and fixedly connected, a through hole is formed in the middle of the array sliding block, a coil is arranged in the middle of the array sliding block, a ferrite magnetic core is fixed in the middle of the coil, and an annular spring is sleeved on the periphery of the array sliding block.
2. An externally worn spring array coil eddy current test probe, as claimed in claim 1, wherein: the elastic array coil eddy current probe is of a columnar through hole structure.
3. An externally worn spring array coil eddy current test probe, as claimed in claim 1, wherein: the elastic axis-wound coil eddy current probe is of a cylindrical through hole structure.
4. An externally worn spring array coil eddy current test probe, as claimed in claim 1, wherein: the shell is of a hollow cylindrical structure.
5. An externally worn spring array coil eddy current test probe, as claimed in claim 1, wherein: the middle parts of the array frameworks are all provided with through holes.
6. An externally worn spring array coil eddy current test probe, as claimed in claim 1, wherein: the array framework is fixedly connected with the array sliding blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023115463.2U CN215218671U (en) | 2020-12-22 | 2020-12-22 | External-through type elastic array coil eddy current detection probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023115463.2U CN215218671U (en) | 2020-12-22 | 2020-12-22 | External-through type elastic array coil eddy current detection probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215218671U true CN215218671U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023115463.2U Active CN215218671U (en) | 2020-12-22 | 2020-12-22 | External-through type elastic array coil eddy current detection probe |
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| Country | Link |
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| CN (1) | CN215218671U (en) |
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2020
- 2020-12-22 CN CN202023115463.2U patent/CN215218671U/en active Active
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