CN219777558U - Passive magnetic identification device for internal and external defects - Google Patents
Passive magnetic identification device for internal and external defects Download PDFInfo
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- CN219777558U CN219777558U CN202320358356.7U CN202320358356U CN219777558U CN 219777558 U CN219777558 U CN 219777558U CN 202320358356 U CN202320358356 U CN 202320358356U CN 219777558 U CN219777558 U CN 219777558U
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 93
- 230000007547 defect Effects 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 72
- 230000005284 excitation Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 230000005415 magnetization Effects 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000004907 flux Effects 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000003302 ferromagnetic material Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model relates to the field of electromagnetic nondestructive detection, and provides a passive magnetic identification device for internal and external defects, which comprises: the device comprises a member to be detected, a loop-type magnetizing device, an eddy current detection sensor and a magnetic leakage detection sensor; the loop-type magnetizing device is in contact with the member to be detected and communicated with the magnetizing loop, and when the loop-type magnetizing device and the member to be detected perform relative motion parallel to the contact surface, the loop-type magnetizing device induces a dynamic eddy current near the contact surface; the eddy current detection sensor mainly comprises an eddy current detection coil, is arranged on the inner wall side of the member to be detected, is close to the contact surface of the member to be detected and the magnetizing device, and receives a dynamic eddy current signal; the magnetic flux leakage detection sensor receives the magnetic flux leakage signal. The utility model can be effectively used for distinguishing inner wall defects and outer wall defects in magnetic leakage detection, simplifies the structure and the circuit of the existing magnetic leakage detection equipment, and reduces the noise source of pollution magnetic leakage detection signals.
Description
Technical Field
The utility model relates to the field of electromagnetic nondestructive detection, in particular to a passive magnetic identification device for internal and external defects.
Background
The oil gas energy is an important support for national economy development, and pipelines, storage tanks and the like for transporting and storing oil gas products are mainly made of ferromagnetic materials. The ferromagnetic material has long service life, regular maintenance is a necessary means for ensuring safety, and the magnetic leakage detection technology is the most commonly used ferromagnetic material detection method. According to the detection result, the detected component is evaluated, and the component is replaced or repaired according to the evaluation result, so that the operation safety of the component is ensured, and the service life of the component is prolonged. Defect positioning in a detection report is an important mark for repairing, and because the waveforms of magnetic leakage detection signals of inner and outer wall defects are similar, the defects can not be distinguished into inner and outer walls, so that other detection systems are generally needed to identify and distinguish the inner and outer wall defects.
The existing magnetic leakage detection inner and outer wall defect detection and identification method mainly utilizes the excitation of some electric fields or magnetic fields to induce eddy currents on the inner wall of a detection object, utilizes the characteristic that the eddy currents of the inner wall are greatly disturbed by the inner wall defects, and receives eddy current abnormal signals of the inner wall through an eddy current detection coil, so that the inner wall defects are identified by utilizing the abnormality of the eddy current signals of the inner wall, and the inner wall defects are distinguished from the outer wall defects. Meanwhile, in order to avoid the pollution of the magnetic leakage detection signal caused by the excitation of an external electric field or a magnetic field, an eddy current detection structure is added outside a certain distance of the magnetic leakage detection structure. In the eddy current detecting structure, alternating current excitation is applied by using a coil, so that eddy current is induced on the inner wall of the detected object, and the defects of the inner wall and the outer wall are detected and identified. This approach results in a large and complex structure of the leakage detection equipment, increasing manufacturing and operating costs. In recent years, there is also a patent for simplifying the structure of the magnetic flux leakage detection device, and it has been proposed to identify an inner wall defect by applying a magnetic field excitation to the magnetic flux leakage detection module and inducing a kinetic eddy current in the inner wall of the detection object. However, the method is additionally provided with magnetic field excitation and is influenced by the change of the operation conditions such as detection lift-off, the distance from the magnetic leakage detection sensor is relatively short and unstable, and induced vortex is also unstable, so that the induced vortex pollutes a magnetic leakage detection signal relatively much, and the accuracy of magnetic leakage detection is weakened.
Disclosure of Invention
In order to solve the technical problems, the present utility model provides a passive magnetic identification device for internal and external defects, comprising: the device comprises a member to be detected, a loop-type magnetizing device, an eddy current detection sensor and a magnetic leakage detection sensor; wherein:
the loop type magnetizing device is characterized in that a main magnetizer of a loop is manufactured by a permanent magnet or a direct current magnet and is used for providing magnetization excitation, and N, S two magnetic poles are formed at two ends of the magnetizing device;
the loop type magnetizing device is arranged on one wall surface of the member to be detected, and the wall surface is the inner wall of the member to be detected;
the N, S magnetic poles of the loop-type magnetizing device are in contact with the member to be detected on the inner wall, and a communicated and closed main magnetizing loop is formed between the loop-type magnetizing device and the member to be detected; the contact surface between the inner wall of the member to be detected and the N, S magnetic poles of the loop-type magnetizing device is a contact surface;
the loop-type magnetizing device is in contact with the member to be detected, and when relative movement parallel to the contact surface occurs, the loop-type magnetizing device induces a dynamic eddy current near the contact surface of the loop-type magnetizing device and the member to be detected;
the eddy current detection sensor and the loop type magnetizing device are arranged on the same side and close to the contact surface of the member to be detected and the magnetizing device, and the eddy current detection sensor and the loop type magnetizing device receive a kinetic eddy current signal induced by the loop type magnetizing device near the contact surface of the inner wall of the member to be detected;
the eddy current detection sensor does not need to be externally connected with any current or voltage excitation for exciting a magnetic field, and does not need to be additionally provided with any magnetization excitation except for a main magnetizer of the loop-type magnetizing device;
the magnetic leakage detection sensor is arranged on the inner wall side of the member to be detected, is close to the inner wall of the member to be detected, is close to the symmetrical center position of the two magnetic poles of the loop-type magnetizing device, and keeps fixed relative positions with the loop-type magnetizing device and the eddy current detection sensor.
Preferably, the system further comprises a signal analysis unit;
the signal analysis unit analyzes and processes the eddy current signal of the member to be detected, identifies internal defects and distinguishes the internal defects from the external defects.
The utility model has the following beneficial effects:
1. the device for identifying the inner wall defects and distinguishing the inner wall defects from the outer wall defects by utilizing the dynamic eddy current signals induced by the magnetic leakage detection main magnetizer on the inner wall surface of the detected object can simply and effectively identify and distinguish the inner wall defects and the outer wall defects of the detected object;
2. the magnetic leakage detection main magnetizer has the advantages that the dynamic eddy current effect of the magnetic leakage detection main magnetizer is utilized, no current or voltage excitation for exciting a magnetic field is needed to be externally added, and magnetization excitation is also needed to be additionally arranged, so that the magnetic leakage detection main magnetizer can be effectively used for distinguishing inner wall defects and outer wall defects in the magnetic leakage detection, the structure and the circuit of the existing magnetic leakage detection equipment are simplified, and the light weight and the miniaturization of related equipment are facilitated;
3. besides the main magnetizer, no magnetic field excitation or electric field excitation for exciting a magnetic field is needed, so that disturbance of the external excitation to a magnetic leakage detection signal in the prior art is obviously reduced, noise sources are reduced, and signal-to-noise ratio of the magnetic leakage detection is improved.
Drawings
FIG. 1 is a block diagram of an internal and external defect passive magnetic identification device;
1000-loop magnetizing device;
FIG. 2 is a first embodiment of a loop type magnetization device;
100-first magnetic conduction steel brush, 200-first permanent magnet, 300-magnetic conduction yoke iron, 400-magnetic leakage detection sensor, 500-eddy current detection sensor, 600-pipe wall of component to be detected, 700-magnetization loop, 800-second permanent magnet and 900-second magnetic conduction steel brush;
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1, the present utility model provides a passive magnetic identification device for internal and external defects, comprising: the device comprises a member to be detected, a loop-type magnetizing device, an eddy current detection sensor and a magnetic leakage detection sensor; wherein:
the loop type magnetizing device is characterized in that a main magnetizer of a loop is manufactured by a permanent magnet or a direct current magnet and is used for providing magnetization excitation, and N, S two magnetic poles are formed at two ends of the magnetizing device;
the loop type magnetizing device is arranged on one wall surface of the member to be detected, and the wall surface is the inner wall of the member to be detected;
the N, S magnetic poles of the loop-type magnetizing device are in contact with the member to be detected on the inner wall, and a communicated and closed main magnetizing loop is formed between the loop-type magnetizing device and the member to be detected; the contact surface between the inner wall of the member to be detected and the N, S magnetic poles of the loop-type magnetizing device is a contact surface;
the loop-type magnetizing device is in contact with the member to be detected, and when relative movement parallel to the contact surface occurs, the loop-type magnetizing device induces a dynamic eddy current near the contact surface of the loop-type magnetizing device and the member to be detected;
the eddy current detection sensor and the loop type magnetizing device are arranged on the same side and close to the contact surface of the member to be detected and the magnetizing device, and the eddy current detection sensor and the loop type magnetizing device receive a kinetic eddy current signal induced by the loop type magnetizing device near the contact surface of the inner wall of the member to be detected;
the eddy current detection sensor does not need to be externally connected with any current or voltage excitation for exciting a magnetic field, and does not need to be additionally provided with any magnetization excitation except for a main magnetizer of the loop-type magnetizing device;
the magnetic leakage detection sensor is arranged on the inner wall side of the member to be detected, is close to the inner wall of the member to be detected, is close to the symmetrical center position of the two magnetic poles of the loop-type magnetizing device, and keeps fixed relative positions with the loop-type magnetizing device and the eddy current detection sensor.
Specifically, the passive magnetic identification device for internal and external defects utilizes the dynamic eddy current effect on the basis of a conventional magnetic leakage detection method, and an eddy current detection sensor is arranged near the contact surface of the loop-type main magnetizer and a member to be detected and is used for picking up dynamic eddy current signals induced on the inner wall surface of the member to be detected by the loop-type main magnetizer and judging the types of the defects of the internal wall and the external wall;
the eddy current detection sensor does not need to apply any current or voltage excitation for exciting a magnetic field; no magnetic field excitation is applied in addition to the main magnetizer.
The loop type main magnetizer is in a U-shaped or C-shaped loop type structure, the installation position can be specifically placed according to the application scene, and if the component to be detected is tubular, the loop type magnetizing device can be installed on the inner wall of the tubular shape or the outer wall of the tubular shape; if the member to be detected is a plate-like member, a loop-type magnetizing device is mounted on the surface thereof. The installation side of the magnetizing device is the inner wall of the utility model, and the distance between the eddy current detection sensor and the contact surface of the member to be detected and the magnetizing device is between 10 and 20 mm.
The loop-type magnetizing apparatus may be specifically designed according to an application scenario, referring to fig. 2, the loop-type magnetizing apparatus in the first embodiment of the present utility model includes: the magnetic conductive steel brush comprises a first magnetic conductive steel brush 100, a first permanent magnet 200, a magnetic conductive yoke 300, a second permanent magnet 800 and a second magnetic conductive steel brush 900;
one end of the first magnetic conduction steel brush and one end of the second magnetic conduction steel brush are movably arranged on the inner surface of the member to be detected;
the other end of the first magnetic conduction steel brush is fixedly connected with one end of the first permanent magnet, and the other end of the second magnetic conduction steel brush is fixedly connected with one end of the second permanent magnet;
one end of the magnetic yoke is fixedly connected with the other end of the first permanent magnet, and the other end of the magnetic yoke is fixedly connected with the other end of the second permanent magnet;
the first magnetic conduction steel brush, the second magnetic conduction steel brush, the first permanent magnet, the second permanent magnet and the magnetic conduction yoke iron form an inverted U-shaped structure, wherein the magnetic poles of the first permanent magnet and the magnetic poles of the second permanent magnet N, S are connected in series to form a main magnetizer of the loop-type magnetizing device.
In practical application, the magnetic steel brushes (100, 900) and the magnetic yoke iron are not necessary constituent items, and can be or not, or can be contained; in fig. 2, the magnetic circuit formed by the first magnetic conductive steel brush 100, the first permanent magnet 200, the magnetic conductive yoke 300, the second permanent magnet 800, the second magnetic conductive steel brush 900 and the pipe wall 600 of the member to be detected can be simplified to be formed by taking one permanent magnet as the main magnetizer and the pipe wall 600 of the member to be detected.
The strength of the eddy current detection sensor for picking up eddy current signals can be effectively enhanced by installing the eddy current detection sensor at a position close to one side of the first permanent magnet and close to the surface of the member to be detected, and the number of turns of the eddy current detection sensor is 100;
the moving eddy current detection sensor senses eddy current caused by a pipe wall magnetic field signal of a member to be detected, and at a defect-free position, the magnetic field on the surface of the ferromagnetic material is not leaked, and the magnetic flux phi of the eddy current detection sensor only changes slightly; at the defect, turbulence is generated by the dynamic eddy current, the magnetic field strength is suddenly increased, and the magnetic flux phi in the eddy current detection sensor is changed; based on faraday's law of electromagnetic induction, the eddy current sensor generates induced electromotive force.
Further, the device also comprises a signal analysis unit;
the signal analysis unit analyzes and processes the eddy current signal of the member to be detected, identifies internal defects and distinguishes the internal defects from the external defects.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present utility model are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third, etc. do not denote any order, but rather the terms first, second, third, etc. are used to interpret the terms as labels.
The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (2)
1. A passive magnetic identification device for internal and external defects, comprising: the device comprises a member to be detected, a loop-type magnetizing device, an eddy current detection sensor and a magnetic leakage detection sensor; wherein:
the loop type magnetizing device is characterized in that a main magnetizer of a loop is manufactured by a permanent magnet or a direct current magnet and is used for providing magnetization excitation, and N, S two magnetic poles are formed at two ends of the magnetizing device;
the loop type magnetizing device is arranged on one wall surface of the member to be detected, and the wall surface is the inner wall of the member to be detected;
the N, S magnetic poles of the loop-type magnetizing device are in contact with the member to be detected on the inner wall, and a communicated and closed main magnetizing loop is formed between the loop-type magnetizing device and the member to be detected; the contact surface between the inner wall of the member to be detected and the N, S magnetic poles of the loop-type magnetizing device is a contact surface;
the loop-type magnetizing device is in contact with the member to be detected, and when relative movement parallel to the contact surface occurs, the loop-type magnetizing device induces a dynamic eddy current near the contact surface of the loop-type magnetizing device and the member to be detected;
the eddy current detection sensor and the loop type magnetizing device are arranged on the same side and close to the contact surface of the member to be detected and the magnetizing device, and the eddy current detection sensor and the loop type magnetizing device receive a kinetic eddy current signal induced by the loop type magnetizing device near the contact surface of the inner wall of the member to be detected;
the eddy current detection sensor does not need to be externally connected with any current or voltage excitation for exciting a magnetic field, and does not need to be additionally provided with any magnetization excitation except for a main magnetizer of the loop-type magnetizing device;
the magnetic leakage detection sensor is arranged on the inner wall side of the member to be detected, is close to the inner wall of the member to be detected, is close to the symmetrical center position of the two magnetic poles of the loop-type magnetizing device, and keeps fixed relative positions with the loop-type magnetizing device and the eddy current detection sensor.
2. The passive magnetic identification device for internal and external defects according to claim 1, further comprising a signal analysis unit;
the signal analysis unit analyzes and processes the eddy current signal of the member to be detected, identifies internal defects and distinguishes the internal defects from the external defects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320358356.7U CN219777558U (en) | 2023-03-01 | 2023-03-01 | Passive magnetic identification device for internal and external defects |
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| CN202320358356.7U CN219777558U (en) | 2023-03-01 | 2023-03-01 | Passive magnetic identification device for internal and external defects |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110423A (en) * | 2023-10-23 | 2023-11-24 | 沈阳仪表科学研究院有限公司 | Wireless nondestructive testing sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110423A (en) * | 2023-10-23 | 2023-11-24 | 沈阳仪表科学研究院有限公司 | Wireless nondestructive testing sensor |
| CN117110423B (en) * | 2023-10-23 | 2024-01-30 | 沈阳仪表科学研究院有限公司 | Wireless nondestructive testing sensor |
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