CN213903409U - Magnetic flux leakage detection sensor excited by rotating magnetic field - Google Patents
Magnetic flux leakage detection sensor excited by rotating magnetic field Download PDFInfo
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- CN213903409U CN213903409U CN202022202972.2U CN202022202972U CN213903409U CN 213903409 U CN213903409 U CN 213903409U CN 202022202972 U CN202022202972 U CN 202022202972U CN 213903409 U CN213903409 U CN 213903409U
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 52
- 230000004907 flux Effects 0.000 title claims description 7
- 230000005284 excitation Effects 0.000 claims abstract description 77
- 230000007547 defect Effects 0.000 abstract description 17
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 101001053395 Arabidopsis thaliana Acid beta-fructofuranosidase 4, vacuolar Proteins 0.000 description 1
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- 230000005672 electromagnetic field Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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Abstract
The utility model relates to a magnetic leakage detection sensor of rotating magnetic field excitation, including excitation device first half, excitation device the latter half, excitation coil skeleton, detection device, through wires hole, excitation device first half and excitation device the latter half evenly twine respectively on excitation coil skeleton, constitute excitation device jointly, detection device arranges the excitation device center in. The excitation device comprises an excitation coil I, an excitation coil II, an excitation coil III, an excitation coil IV, an excitation coil V and an excitation coil VI. The detection device comprises a detection coil framework and a detection coil, wherein the detection coil is uniformly wound in a groove in the detection coil framework and is led out through a threading hole. The invention has the beneficial effects that: the exciting device can generate two pairs of opposite rotating magnetic fields, the leakage magnetic field is sensitive to defects in all directions, mechanical rotation is avoided, the detection coil can pick up all axial disturbance signals generated by the defects, the axial disturbance signals are not influenced by lifting, and the detection coil is suitable for pipelines with different outer diameters.
Description
Technical Field
The utility model belongs to magnetic leakage nondestructive test field relates to a sensor, in particular to rotating magnetic field excitation's magnetic leakage detection sensor.
Background
The traditional magnetic leakage detection technology is based on the principle of magnetic leakage flux, the strong magnetic field of a permanent magnet is used for magnetizing the pipe wall of a ferromagnetic metal pipeline to the saturation degree through a magnetic conduction medium, a magnetic loop field is generated on the circumference of the pipe wall, and when the pipe wall has defects, magnetic lines of force penetrate out of the pipe wall to form the magnetic leakage field. The leakage flux detection is a detection method that magnetic flux signals leaked to the outside from the magnetized pipeline defect are picked up and then electric signals related to the shape of the defect are obtained through a signal processing device, and the purpose of quantitative analysis of the defect can be achieved by calculating with the help of various mathematical and physical tools.
The design of magnetic leakage sensor is the key of magnetic leakage detection technique, and rotating magnetic field magnetic leakage detection technique is the application magnetic interference principle, is magnetized ferromagnetic or non-ferromagnetic metal material by rotating magnetic field, produces the electromagnetic circuit of rotatory change in pipe wall department, if the pipe wall appears unusually, then can produce the disturbance to the former rotating magnetic field of nearly pipe wall department, utilizes detecting element can detect the disturbance signal to through certain analysis processes, can discover pipeline inner wall defect.
The traditional magnetic leakage detection theory system considers that the detection performance of the defect on the tested piece is related to the magnetization direction, and when the included angle between the magnetization direction and the direction of the defect is less than 20 degrees, the magnetic leakage field of the defect is almost zero, and only when the magnetization direction is vertical or nearly vertical to the direction of the defect, the diffusion magnetic leakage field can be well formed. The rotating electromagnetic field magnetic leakage detection technology is excited by a rotating magnetic field, the formed magnetic field has components in different axial, tangential and radial directions, and the magnetic field excitation changes in a circumferential direction continuously in a rotating mode, so that the defect that a traditional magnetic leakage detection device rotates mechanically is avoided, the defects in all directions can be detected, and the problem that the traditional magnetic leakage detection device can only detect the defects in the specific direction is avoided.
Disclosure of Invention
The utility model aims at solving the above problem, provide a magnetic leakage detection sensor of rotating magnetic field excitation, the technical scheme of its adoption as follows:
the utility model provides a magnetic leakage detection sensor of rotating magnetic field excitation, includes excitation device upper half, excitation device the latter half, excitation coil skeleton, detection device, through wires hole, and excitation device upper half, excitation device the latter half evenly twine respectively in the both sides of excitation coil skeleton, constitute excitation device jointly, and detection device arranges the center of excitation upper half and excitation coil the latter half in.
The upper half part of the excitation device comprises an excitation coil I, an excitation coil II and an excitation coil III which are wound on one side of the excitation coil framework.
The lower half part of the exciting coil comprises an exciting coil IV, an exciting coil V and an exciting coil VI which are wound on the other side of the exciting coil framework.
The detection device comprises a detection coil framework and a detection coil, wherein the detection coil is uniformly wound in a groove in the detection coil framework and is led out through a threading hole.
The utility model has the advantages that: under the influence of the interaction of a single rotating magnetic field and two rotating magnetic fields, the detection magnetic field has magnetic fields with components in different directions, so that the detection magnetic field is sensitive to defects in all directions.
The utility model discloses a rotating magnetic field excitation because rotating magnetic field's periodic rotation changes, consequently can both detect the defect anomaly of each position of pipeline circumference, and avoided mechanical rotation.
The utility model discloses exciting coil's frequency can be adjusted, and the regulation through frequency can improve depth of detection.
The utility model discloses a detection coil can pick up all axial disturbing signal that produce by the defect, does not receive the influence of carrying away, adapts to the pipeline of different external diameters.
Drawings
FIG. 1: the utility model has a structural section view;
FIG. 2: the utility model discloses an oblique view;
FIG. 3: the utility model discloses a front view;
FIG. 4: a structural section view of the detection device;
description of the figures: 1. the device comprises an upper excitation coil part 2, a detection device 3, a lower excitation coil part 11, an excitation coil I12, an excitation coil II 13, an excitation coil III 31, an excitation coil IV 32, an excitation coil V33, an excitation coil VI 4, an excitation coil skeleton 21, a detection coil skeleton 5, a threading hole 22, a detection coil
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples:
a magnetic flux leakage detection sensor excited by a rotating magnetic field is shown in figures 1, 2 and 3 and comprises an upper half part (1) of an excitation device, a lower half part (3) of the excitation device, an excitation coil framework (4), a detection device (2) and a threading hole (5), wherein the upper half part (1) of the excitation device and the lower half part (3) of the excitation device are uniformly wound on two sides of the excitation coil framework (7) respectively to form the excitation device together, and the detection device (2) is arranged in the centers of the excitation coil (1) and the excitation coil (3).
The excitation device (1) comprises an excitation coil I (11), an excitation coil II (12) and an excitation coil III (13) which are wound on one side of the excitation coil framework (4).
The exciting coil (3) comprises an exciting coil IV (31), an exciting coil V (32) and an exciting coil VI (33) and is wound on the other side of the exciting coil framework (4).
The detection device (2) comprises a detection coil framework (21) and a detection coil (22) as shown in fig. 4, wherein the detection coil (22) is uniformly wound on a groove on the detection coil framework (21) and is led out through a threading hole (5).
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (4)
1. A rotating field excited magnetic flux leakage detection sensor, characterized in that: the structure includes excitation device first half (1), excitation device latter half (3), excitation coil skeleton (4), detection device (2), through wires hole (5), and excitation device first half (1), excitation device latter half (3) evenly twine respectively in the both sides of excitation coil skeleton (4), constitute excitation device jointly, and the center of excitation device first half (1) and excitation device latter half (3) is arranged in to detection device (2).
2. The rotating-field-excited leakage magnetic detection sensor according to claim 1, characterized in that: the upper half part (1) of the excitation device comprises an excitation coil I (11), an excitation coil II (12) and an excitation coil III (13) which are wound on one side of an excitation coil framework (4).
3. The rotating-field-excited leakage magnetic detection sensor according to claim 1, characterized in that: the lower half part (3) of the excitation device comprises an excitation coil IV (31), an excitation coil V (32) and an excitation coil VI (33) which are wound on the other side of the excitation coil framework (4).
4. The rotating-field-excited leakage magnetic detection sensor according to claim 1, characterized in that: the detection device (2) comprises a detection coil framework (21) and a detection coil (22), wherein the detection coil (22) is uniformly wound in a groove in the detection coil framework (21) and is led out through the threading hole (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022202972.2U CN213903409U (en) | 2020-09-30 | 2020-09-30 | Magnetic flux leakage detection sensor excited by rotating magnetic field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022202972.2U CN213903409U (en) | 2020-09-30 | 2020-09-30 | Magnetic flux leakage detection sensor excited by rotating magnetic field |
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| CN213903409U true CN213903409U (en) | 2021-08-06 |
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| CN202022202972.2U Expired - Fee Related CN213903409U (en) | 2020-09-30 | 2020-09-30 | Magnetic flux leakage detection sensor excited by rotating magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049675A (en) * | 2021-04-09 | 2021-06-29 | 中国石油大学(华东) | Rotating electromagnetic field pipeline defect layered detection probe and method |
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2020
- 2020-09-30 CN CN202022202972.2U patent/CN213903409U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049675A (en) * | 2021-04-09 | 2021-06-29 | 中国石油大学(华东) | Rotating electromagnetic field pipeline defect layered detection probe and method |
| CN113049675B (en) * | 2021-04-09 | 2022-07-29 | 中国石油大学(华东) | Rotating electromagnetic field pipeline defect layered detection probe and method |
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Granted publication date: 20210806 |