CN210834768U - Eddy current flaw detection device based on orthogonal detection - Google Patents
Eddy current flaw detection device based on orthogonal detection Download PDFInfo
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- CN210834768U CN210834768U CN201920667377.0U CN201920667377U CN210834768U CN 210834768 U CN210834768 U CN 210834768U CN 201920667377 U CN201920667377 U CN 201920667377U CN 210834768 U CN210834768 U CN 210834768U
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- iron core
- eddy current
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Abstract
The utility model provides an eddy current flaw detection device based on orthogonal detection, which comprises a shell, an iron core and an electromagnetic sensor array, wherein the iron core and the electromagnetic sensor array are arranged in the shell and are in orthogonal distribution; the iron cores which are distributed orthogonally comprise two same U-shaped iron cores which are orthogonally fixed in the shell respectively; the end parts of the first iron core and the second iron core are respectively wound with coils which are used as eddy current generating devices, and the coils form independent circuits through coil wires respectively, are led out of the shell and are connected with the exciting circuit; the electromagnetic sensor array is formed by arranging a plurality of magnetic sensors into an M-N combination and is used for receiving a feedback signal of eddy current detection; the utility model discloses an eddy current inspection device based on quadrature detection can form rotatory eddy current at rail surface and subsurface, realizes comprehensive detection through rotatory eddy current.
Description
Technical Field
The utility model belongs to the technical field of the eddy current testing technique and specifically relates to an eddy current inspection device based on quadrature detection to the eddy current testing of rail damage.
Background
At present, there are mainly 4 rail detection methods, each of which has advantages and disadvantages. Manual identification: the detection speed is low, the precision is poor, and the requirement on the working literacy of detection personnel is extremely high; ultrasonic flaw detection: the method is suitable for detecting the inside of the rail and is extremely easy to be influenced by environmental factors; CCD line scanning camera: the detection precision is high, the method is suitable for detecting the surface of the rail and is easily influenced by impurities on the surface of the rail; traditional eddy current flaw detection: the method is suitable for detecting the surface and the subsurface of the rail, can accurately judge the position of the defect, but still cannot realize the quantitative evaluation of the shape, the size and the damage degree of the rail defect.
At present, the eddy current generated by the probe of most eddy current rail flaw detectors can only complete the crack detection of a certain type of defects, such as: and (4) transverse cracking. Longitudinal cracks are difficult to measure, which directly results in the possibility of missed inspection and is inefficient.
In the conventional eddy current flaw detection technology, an alternating magnetic field generated by alternating current acts on a conductive material to be detected to induce eddy current. If there is a defect in the material, it will disturb the generated eddy currents, (i.e. create a disturbing signal). The condition of the defect can be known by detecting the interference signal by an eddy current flaw detector. The eddy current is influenced by a plurality of factors, namely, the eddy current is loaded with abundant signals which are related to a plurality of factors of materials, and useful signals can be separated from a plurality of signals one by one, so that the defect condition can be judged. The quantitative evaluation of the shape, size and damage degree of the defect is not sufficient.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the problem of lou examining among the prior art, provide an eddy current inspection device based on quadrature detects, form a rotatory eddy current at rail surface and subsurface, realize detecting through rotatory eddy current.
In order to realize the purpose, the utility model adopts the following technical scheme:
an eddy current flaw detection device based on orthogonal detection comprises a shell, an iron core and an electromagnetic sensor array, wherein the iron core and the electromagnetic sensor array are arranged in the shell in an orthogonal distribution mode;
the iron cores in orthogonal distribution comprise two identical U-shaped iron cores, namely a first iron core and a second iron core which are orthogonally fixed in the shell, the first iron core and the second iron core are distributed in an orthogonal position, and a gap is reserved between the first iron core and the second iron core;
the electromagnetic sensor array is formed by arranging a plurality of magnetic sensors to form an M-N combination, wherein M and N are positive integers which are more than or equal to 2, and the lower surface of the electromagnetic sensor array and the free ends of the side parts of the U-shaped iron cores which are distributed orthogonally are positioned on the same plane;
each pair of coils forms an independent circuit through coil wires respectively, is led out of the shell and is connected with an excitation circuit; one end of the coil is flush with the end part of the iron core;
the electromagnetic sensor array is led out of the shell through a lead-out wire and connected with the signal processing circuit.
Preferably, the shell includes upper housing, lower casing and extension, and the extension is fixed with upper housing, and lower casing is fixed with upper housing detachably block, wherein the iron core, coil and the electromagnetic sensor array of orthogonal distribution all install in the lower casing.
Preferably, the lead-out wire corresponding to the magnetic sensor and the coil wire corresponding to the coil are collected to the extension portion and then led out through the outlet of the extension portion.
Preferably, a PCB board is further fixed inside the lower housing on a side away from the upper housing, and the electromagnetic sensor array is disposed on the PCB board.
Preferably, the magnetic sensor is a three-axis electromagnetic sensor of AMI 306R.
Compared with the prior art, the utility model discloses an eddy current inspection device based on quadrature detects, iron core and coil through two sets of orthogonals are as eddy current generating device, make the probe can form a rotatory eddy current on rail surface and subsurface, if defect in the rail that detects, the testing result of probe will change (form interference signal promptly), detect out through the magnetic sensor array promptly, accomplish the detection of the different grade type defect on rail surface and subsurface, in order to do benefit to and to carry out visual, the categorised aassessment of quantification to the rail damage effectively.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an eddy current flaw detector based on orthogonal detection according to the present invention.
Fig. 2 is a schematic diagram of an orthogonal core of an eddy current flaw detector according to the present invention.
Fig. 3 and 4 are perspective views of the orthogonal type core of fig. 2 at different angles.
Fig. 5 and 6 are a side view and a plan view of the orthogonal type core of fig. 2.
Detailed Description
For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.
Referring to fig. 1-6, the eddy current flaw detection apparatus based on orthogonal detection according to the present invention includes a housing, an iron core, an electromagnetic sensor array, and a coil wound on an end of the iron core, wherein the iron core and the coil are orthogonally disposed in the housing, and the iron core and the coil form a detection probe. Make it produce the eddy current through applying excitation current to the coil, because the utility model discloses a dual quadrature coil produces rotatory eddy current, realizes surveying comprehensively to the damage.
As shown in fig. 1, the housing includes an upper case 10a, a lower case 10b, and an extension 10c, the extension 10c is fixed to the upper case 10a, and the extension protrudes from the upper case 10 a.
The lower case 10b is detachably engaged with the upper case 10a, and is, for example, an engaging structure with a stopper in the drawing.
Referring to fig. 1 and 2, the orthogonally distributed cores include two identical U-shaped cores, a first core 1a and a second core 1b, which are orthogonally fixed in the housing, particularly, inside the lower case 10b, respectively.
The first core 1a and the second core 1b are distributed in an orthogonal position with a gap left therebetween.
Referring to fig. 2, 3 and 4, coils 3a and 3b are wound around the opposite end portions of the first core 1a and the second core 1b, respectively, to serve as eddy current generators.
The opposite coils form independent circuits through respective coil leads, are led out of the shell and are connected with an excitation circuit, namely an alternating current excitation circuit.
As shown in connection with fig. 1, one end of the coil of each winding is flush with the end of the corresponding core.
With reference to fig. 2 to 6, the electromagnetic sensor array is formed by arranging a plurality of magnetic sensors 2 to form M × N combinations, i.e. M rows and N columns, and receives a feedback signal for eddy current detection. M and N are both positive integers greater than or equal to 2. The lower surface of the electromagnetic sensor array and the free end of the side part of the U-shaped iron core which is orthogonally distributed are positioned on the same plane.
The electromagnetic sensor array is led out of the shell through the lead-out wires and connected with the signal processing circuit.
In the foregoing embodiment, the winding base of the coil is provided by the orthogonal U-shaped iron cores, which plays a role in concentrating magnetism to reduce energy loss.
Referring to fig. 1, when a pulse signal is applied to the coil, the winding coil will generate a magnetic field, and an eddy current is formed on the surface (e.g. rail) to be detected and the sub-surface, and the probe forms a rotating eddy current on the rail surface and the sub-surface by applying the pulse input signal to the coils on two orthogonal iron cores. If the detected rail is defective, the detection result of the probe will change (i.e. a disturbing signal is formed).
The utility model discloses the preferred triaxial electromagnetic sensor who adopts AMI306R detects out its interfering signal as the magnetic sensor that the feedback detected to confirm the situation of defect.
With reference to fig. 1, the orthogonally distributed cores, coils, and electromagnetic sensor array are all mounted within the lower housing.
Preferably, the weight of the iron core, the coil and the magnetic sensor is light, which is beneficial to the miniaturization design of the whole device. The core and the PCB board are both fixed to the housing using an adhesive.
Preferably, the shell is made of a ferrous material so as to carry out electromagnetic shielding and avoid the influence of an external magnetic field on the flaw detection equipment.
Referring to fig. 1, preferably, the lead-out wires corresponding to the magnetic sensor 2 and the coil wires corresponding to the coil are gathered to the extension portion 10c and then led out through the outlet 9 of the extension portion. In the figure, the lead-out wires are collectively denoted by reference numeral 11.
As shown in fig. 1, a PCB board 5 is further fixed inside the lower casing 10b on a side away from the upper casing, and the electromagnetic sensor array is disposed on the PCB board to realize fixed installation of the sensor array.
Preferably, a wire slot (not marked) is arranged between the iron core which is distributed orthogonally and the inner wall of the shell, so that the lead-out wire can pass through the wire slot. Therefore, the lead-out channels of the wires are reasonably arranged in the partial area in the shell, are collected in the extension part together, and are led out through the extension part in a unified gathering mode.
The utility model discloses an eddy current inspection device based on quadrature detection can form rotatory eddy current on surveying the object, especially can detect the defect of rail surface and sub-surface different grade type to can avoid environmental variable to traditional detection means influence such as ultrasonic wave, flaw detection methods such as CCD line scanning camera effectively.
The device performance is as follows:
1. positioning the crack position: error is not more than 1mm
2. Crack shape reconstruction size: error less than 2mm
3. Surface damage position: error is not more than 2mm
4. Surface damage shape reconstruction size: error less than 2mm
5. Flaw detection depth of the rail surface: approximately equal to 2mm, can detect the surface cracks and fatigue damage (early defects) of the rail and subsurface
6. Rail surface detection speed: 3 km/h during portable detection; 15 km/h for detecting flaw train
7. Detection device use temperature: 40 ℃ below zero to 60 DEG C
Compared with the prior art, the utility model discloses an eddy current inspection device based on quadrature detects, iron core and coil through two sets of orthogonals are as eddy current generating device, make the probe can form a rotatory eddy current on rail surface and subsurface, if defect in the rail that detects, the testing result of probe will change (form interference signal promptly), detect out through the magnetic sensor array promptly, accomplish the detection of the different grade type defect on rail surface and subsurface, in order to do benefit to the later stage and can carry out visual, the categorised aassessment of quantification to the rail damage effectively.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (5)
1. An eddy current flaw detection device based on orthogonal detection is characterized by comprising a shell, an iron core and an electromagnetic sensor array, wherein the iron core and the electromagnetic sensor array are arranged in the shell and are distributed orthogonally;
the iron cores in orthogonal distribution comprise two identical U-shaped iron cores, namely a first iron core and a second iron core which are orthogonally fixed in the shell, the first iron core and the second iron core are distributed in an orthogonal position, and a gap is reserved between the first iron core and the second iron core;
each iron core in the iron cores which are distributed in an orthogonal mode is wound with a coil at the position of the opposite end portion of the iron core and used as an eddy current generating device, and each pair of coils form an independent circuit through coil wires, are led out of the shell and are connected with an excitation circuit; one end of each coil is flush with the end part of the corresponding iron core;
the electromagnetic sensor array is formed by arranging a plurality of magnetic sensors to form an M-N combination and used for receiving a feedback signal of eddy current detection, wherein M and N are positive integers which are more than or equal to 2, and the lower surface of the electromagnetic sensor array and the free end of the side part of the U-shaped iron core which is orthogonally distributed are positioned on the same plane;
the electromagnetic sensor array is led out of the shell through a lead-out wire and is connected with the signal processing circuit;
the shell comprises an upper shell, a lower shell and an extension part, the extension part is fixed with the upper shell, the lower shell is detachably clamped and fixed with the upper shell, and the iron core, the coil and the electromagnetic sensor array which are distributed orthogonally are all arranged in the lower shell;
a PCB is further fixed inside the lower shell and on one side far away from the upper shell, and the electromagnetic sensor array is arranged on the PCB;
the core and the PCB are both secured to the housing with an adhesive.
2. The eddy current flaw detector according to claim 1, wherein the lead-out wire corresponding to the magnetic sensor and the coil wire corresponding to the coil are collected in the extension portion and led out through an outlet of the extension portion.
3. The eddy current flaw detection device based on orthogonal detection as claimed in claim 1, wherein a wire slot is provided between the iron core distributed orthogonally and an inner wall of the housing for the lead-out wire to pass through.
4. The eddy current inspection apparatus based on orthogonal detection as claimed in claim 1, wherein the magnetic sensor is a three-axis electromagnetic sensor of AMI 306R.
5. The eddy current testing apparatus based on orthogonal detection as claimed in claim 1, wherein the housing is made of ferrous material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920667377.0U CN210834768U (en) | 2019-05-07 | 2019-05-07 | Eddy current flaw detection device based on orthogonal detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920667377.0U CN210834768U (en) | 2019-05-07 | 2019-05-07 | Eddy current flaw detection device based on orthogonal detection |
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| CN210834768U true CN210834768U (en) | 2020-06-23 |
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| CN201920667377.0U Expired - Fee Related CN210834768U (en) | 2019-05-07 | 2019-05-07 | Eddy current flaw detection device based on orthogonal detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562966A (en) * | 2022-03-15 | 2022-05-31 | 广东省特种设备检测研究院珠海检测院 | Carbon steel pipeline residual wall thickness rapid inspection device and use method thereof |
-
2019
- 2019-05-07 CN CN201920667377.0U patent/CN210834768U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562966A (en) * | 2022-03-15 | 2022-05-31 | 广东省特种设备检测研究院珠海检测院 | Carbon steel pipeline residual wall thickness rapid inspection device and use method thereof |
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Granted publication date: 20200623 |