Multi-directional stress measurement sensor and measurement method

Abstract

The present application relates to the technical field of stress measurement, and in particular to a multi-directional stress measurement sensor and measurement method. The stress measurement sensor comprises: a magnet yoke group, an excitation coil group and a magneto-dependent sensor group, wherein a first magnetic yoke and a second magnetic yoke in the magnet yoke group intersect with each other, and the magneto-dependent sensor group, two ends of the first magnetic yoke and two ends of the second magnetic yoke are located on a surface to be subjected to measurement of a pipeline test piece; a first coil, a second coil, a third coil and a fourth coil in the excitation coil group are connected to the two ends of the first magnetic yoke and the two ends of the second magnetic yoke; a first magneto-dependent sensor, a second magneto-dependent sensor, a third magneto-dependent sensor and a fourth magneto-dependent sensor in the magneto-dependent sensor group are each disposed at the midpoint of a connecting line between adjacent legs of the first magnetic yoke and the second magnetic yoke; and a fifth magneto-dependent sensor is disposed at the midpoint of a connecting line between diagonal legs of the first magnetic yoke and the second magnetic yoke. By changing the mode in which a current is introduced into coils, and collecting magnetic field changes by means of a magneto-dependent sensor group, the problem of being unable to accurately measure multi-directional stress is solved.

Description

Multi-directional stress detection sensor and detection method Technical Field

[0001] The present application relates to the field of stress measurement technology, and in particular to a multi-directional stress detection sensor and a detection method. Background Art

[0002] An oil pipeline is a system used to transport oil and natural gas, primarily consisting of pipelines, transfer stations, and other ancillary equipment. Compared to rail and road transportation, oil pipelines offer high capacity, excellent sealing, low cost, and a high safety factor. Oil and natural gas pipelines are made of metal, and are susceptible to stress concentration due to factors such as their own weight, internal and external loads, material aging, the external environment, and structural displacement. This can lead to pipeline ruptures, leaks, explosions, and other major safety incidents. Stress is inevitably generated during the preparation and operation of oil pipelines. In areas of high stress concentration, the pipeline's performance will be altered, making it prone to brittle fracture. Therefore, timely, effective, and rapid identification of pipeline stress concentrations and the implementation of appropriate remedial measures can effectively prevent safety incidents.

[0003] In the related art, the stress evaluation of pipeline specimens is performed in a uniaxial or orthogonal direction. When the stress direction is inconsistent with the two-axis orthogonal direction, there is an issue of inaccurate stress evaluation values, leading to incorrect evaluation of the stress distribution in the specimen.

[0004] Summary of the Invention

[0005] The present application provides a multi-directional stress detection sensor and a detection method to solve the problem of being unable to accurately measure multi-directional stress.

[0006] A first aspect of the present application provides a multi-directional stress detection sensor, comprising: a magnetic yoke group, an excitation coil group, and a magnetic sensitive sensor group;

[0007] The magnetic yoke group includes a first magnetic yoke and a second magnetic yoke, the first magnetic yoke and the second magnetic yoke cross each other, and the bottom of the magnetic sensor group and the two ends of the first magnetic yoke and the second magnetic yoke are located on the surface to be tested of the pipeline specimen; the excitation coil group includes a first coil, a second coil, a third coil and a fourth coil; the first coil, the second coil, the third coil and the fourth coil are respectively connected to the two ends of the first magnetic yoke and the second magnetic yoke; the magnetic sensor group includes a first magnetic sensor, a second magnetic sensor, a third magnetic sensor, a fourth magnetic sensor and a fifth magnetic sensor; the first magnetic sensor, the second magnetic sensor, the third magnetic sensor and the fourth magnetic sensor are respectively arranged at the midpoint of the line connecting the adjacent legs of the first magnetic yoke and the second magnetic yoke; the fifth magnetic sensor is arranged at the midpoint of the line connecting the diagonal legs of the first magnetic yoke and the second magnetic yoke.

[0008] The multi-directional stress detection sensor excites magnetic fields in multiple directions in the pipeline specimen by changing the mode of current passing through the coils on the magnetic yoke group, and collects magnetic field changes through the magnetic sensitive sensor group arranged around the magnetic yoke group, thereby realizing non-destructive detection of multi-directional stress, thereby solving the problem of being unable to accurately measure multi-directional stress.

[0009] Optionally, both the first magnetic yoke and the second magnetic yoke are U-shaped magnetic conductive yokes.

[0010] Optionally, the first yoke includes a first yoke leg, a first yoke connecting portion and a second yoke leg, and the two ends of the first yoke connecting portion are respectively connected to the first yoke leg and the second yoke leg; the second yoke includes a third yoke leg, a second yoke connecting portion and a fourth yoke leg, and the two ends of the second yoke connecting portion are respectively connected to the third yoke leg and the fourth yoke leg; the first yoke connecting portion and the second yoke connecting portion cross each other.

[0011] The first magnetic yoke connecting portion and the second magnetic yoke connecting portion intersect each other so that the magnetic fields are not affected and it is convenient to calculate stress values ​​in multiple directions.

[0012] Optionally, the first coil, the second coil, the third coil and the fourth coil are all connected to an AC power supply, and are respectively and sequentially connected to the first yoke leg, the second yoke leg, the third yoke leg and the fourth yoke leg.

[0013] The first coil, the second coil, the third coil and the fourth coil can generate an alternating magnetic field in the magnetic yoke group after an alternating current is passed through them, and form a magnetic circuit with the pipeline test piece, thereby facilitating rapid and accurate detection.

[0014] Optionally, the spacing between the first yoke leg and the third yoke leg, the spacing between the third yoke leg and the second yoke leg, the spacing between the second yoke leg and the fourth yoke leg, and the spacing between the fourth yoke leg and the first yoke leg are all equal, which makes it easier to calculate the stress value.

[0015] Optionally, the first magnetic yoke and the second magnetic yoke are not connected, and a gap is provided between the bottom surface of the first magnetic yoke connecting portion and the top surface of the second magnetic yoke connecting portion.

[0016] The gap can reduce the occurrence of magnetic field coupling between the first magnetic yoke and the second magnetic yoke.

[0017] A second aspect of the present application provides a multi-directional stress detection method, which is applied to the multi-directional stress detection sensor described in the first aspect. The method includes:

[0018] Exciting the third coil and the fourth coil in opposite directions;

[0019] obtaining a first excitation voltage and a first excitation frequency;

[0020] collecting the first magnetic field signal and the second magnetic field signal by a fifth magnetic sensor;

[0021] A first directional stress value is calculated according to the first excitation voltage, the first excitation frequency, the first magnetic field signal, and the second magnetic field signal.

[0022] The above method can enable the multi-directional stress detection sensor to detect the stress value in the first direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0023] Optionally, the method further includes:

[0024] Exciting the first coil and the second coil in opposite directions;

[0025] Acquire a second excitation voltage and a second excitation frequency;

[0026] collecting the first magnetic field signal and the second magnetic field signal by the fifth magnetic sensor;

[0027] A second directional stress value is calculated according to the second excitation voltage, the second excitation frequency, the first magnetic field signal, and the second magnetic field signal.

[0028] The above method can enable the multi-directional stress detection sensor to detect the stress value in the second direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0029] Optionally, the method further includes:

[0030] Exciting the first coil, the second coil, the third coil, and the fourth coil, and making the excitation directions of the first coil and the fourth coil opposite to those of the second coil and the third coil;

[0031] obtaining a third excitation voltage and a third excitation frequency;

[0032] collecting a third magnetic field signal and a fourth magnetic field signal by using the first magnetic sensor and the second magnetic sensor;

[0033] A stress value in a third direction is calculated according to the third excitation voltage, the third excitation frequency, the third magnetic field signal, and the fourth magnetic field signal.

[0034] The above method can enable the multi-directional stress detection sensor to detect the stress value in the third direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0035] Optionally, the method further includes:

[0036] Exciting the first coil, the second coil, the third coil, and the fourth coil, and making the second coil and the fourth coil excited in opposite directions to the first coil and the third coil;

[0037] obtaining a fourth excitation voltage and a fourth excitation frequency;

[0038] collecting a fifth magnetic field signal and a sixth magnetic field signal by using a third magnetic sensor and a fourth magnetic sensor;

[0039] A fourth direction stress value is calculated according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal, and the sixth magnetic field signal.

[0040] The above method can enable the multi-directional stress detection sensor to detect the stress value in the fourth direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0041] As can be seen from the above technical solution, the present application provides a multi-directional stress detection sensor and a detection method, wherein the multi-directional stress detection sensor includes: a magnetic yoke group, an excitation coil group and a magnetic sensor group; the magnetic yoke group includes a first magnetic yoke and a second magnetic yoke, the first magnetic yoke and the second magnetic yoke cross each other, and the bottom of the magnetic sensor group and the two ends of the first magnetic yoke and the second magnetic yoke are located on the surface to be tested of the pipe specimen; the excitation coil group includes a first coil, a second coil, a third coil and a fourth coil; the first coil, the second coil, the third coil and the fourth coil are respectively connected to the two ends of the first magnetic yoke and the second magnetic yoke; the magnetic sensor group includes a first magnetic sensor, a second magnetic sensor, a third magnetic sensor, a fourth magnetic sensor and a fifth magnetic sensor; the first magnetic sensor, the second magnetic sensor, the third magnetic sensor and the fourth magnetic sensor are respectively arranged at the midpoint of the line connecting the adjacent legs of the first magnetic yoke and the second magnetic yoke; the fifth magnetic sensor is arranged at the midpoint of the line connecting the diagonal legs of the first magnetic yoke and the second magnetic yoke. By changing the mode of passing current through the coil, a magnetic field is excited in the pipeline test piece, and the magnetic field changes are collected by the magnetic sensor group to solve the problem of being unable to accurately measure multi-directional stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] FIG1 is a schematic diagram of the three-dimensional structure of a multi-directional stress detection sensor according to an embodiment of the present application;

[0044] FIG2 is a schematic diagram of the three-dimensional structure of a magnetic yoke assembly of a multi-directional stress detection sensor according to an embodiment of the present application;

[0045] FIG3 is a schematic diagram of the stress magnetic field in the first direction in the multi-directional stress detection method according to an embodiment of the present application;

[0046] FIG4 is a schematic diagram of the direction of the stress magnetic field in the second direction in the multi-directional stress detection method according to an embodiment of the present application;

[0047] FIG5 is a schematic diagram of the direction of the stress magnetic field in the third direction in the multi-directional stress detection method according to an embodiment of the present application;

[0048] FIG6 is a schematic diagram of the fourth direction stress magnetic field trend in the multi-directional stress detection method according to an embodiment of the present application.

[0049] Illustration:

[0050] Among them, 11-first yoke; 111-first yoke leg; 112-first yoke connecting part; 113-second yoke leg; 12-second yoke; 121-third yoke leg; 122-second yoke connecting part; 123-fourth yoke leg; 21-first coil; 22-second coil; 23-third coil; 24-fourth coil; 31-first magnetic sensor; 32-second magnetic sensor; 33-third magnetic sensor; 34-fourth magnetic sensor; 35-fifth magnetic sensor. DETAILED DESCRIPTION

[0051] An oil pipeline is a system used to transport oil and natural gas, primarily consisting of pipelines, transfer stations, and other ancillary equipment. Compared to rail and road transportation, oil pipelines offer high capacity, excellent sealing, low cost, and a high safety factor. Oil and natural gas pipelines are made of metal, and are susceptible to stress concentration due to factors such as their own weight, internal and external loads, material aging, the external environment, and structural displacement. This can lead to pipeline ruptures, leaks, explosions, and other major safety incidents. Stress is inevitably generated during the preparation and operation of oil pipelines. In areas of high stress concentration, the pipeline's performance will be altered, making it prone to brittle fracture. Therefore, timely, effective, and rapid identification of pipeline stress concentrations and the implementation of appropriate remedial measures can effectively prevent safety incidents.

[0052] The stress evaluation of the pipeline specimens in the relevant embodiments is all uniaxial or orthogonal. When the stress direction is inconsistent with the two-axis orthogonal direction, there is a problem of inaccurate stress evaluation values, resulting in incorrect evaluation of the stress distribution in the specimen.

[0053] To solve the problem of being unable to accurately measure multi-directional stress, see Figure 1, which is a schematic diagram of the three-dimensional structure of a multi-directional stress detection sensor. Some embodiments of the present application provide a multi-directional stress detection sensor, including: a magnetic yoke group, an excitation coil group, and a magnetic sensor group;

[0054] The magnetic yoke group includes a first magnetic yoke 11 and a second magnetic yoke 12, which intersect each other. The bottom of the magnetic sensor group and the two ends of the first magnetic yoke 11 and the second magnetic yoke 12 are located on the surface to be tested of the pipe specimen; the excitation coil group includes a first coil 21, a second coil 22, a third coil 23 and a fourth coil 24; the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 are respectively connected to the two ends of the first magnetic yoke 11 and the second magnetic yoke 12; the magnetic sensor group includes a first magnetic sensor 31, a second magnetic sensor 32, a third magnetic sensor 33, a fourth magnetic sensor 34 and a fifth magnetic sensor 35; the first magnetic sensor 31, the second magnetic sensor 32, the third magnetic sensor 33 and the fourth magnetic sensor 34 are respectively arranged at the midpoint of the line connecting the adjacent legs of the first magnetic yoke 11 and the second magnetic yoke 12; the fifth magnetic sensor 35 is arranged at the midpoint of the line connecting the diagonal legs of the first magnetic yoke 11 and the second magnetic yoke 12.

[0055] It should be understood that the multi-directional stress detection sensor is based on electromagnetic principles. When alternating current is applied to the coils in the yoke assembly, the yokes in the assembly form a closed magnetic circuit with the pipe specimen. When stress is present in the pipe specimen, its magnetic properties change. The magnetic sensors arranged around the yokes can detect the spatial magnetic field changes and thus detect the stress in the pipe specimen. The magnetic sensors in the magnetic sensor assembly are triaxial, capable of measuring magnetic fields in three orthogonal directions.

[0056] The multi-directional stress detection sensor excites magnetic fields in multiple directions in the pipeline test piece by changing the current pattern of the coil on the magnetic yoke group, and collects the magnetic field changes through the magnetic sensitive sensor group arranged around the magnetic yoke group, thereby realizing multi-directional stress detection to solve the problem of being unable to accurately measure multi-directional stress.

[0057] In some embodiments, the crossing angle between the first magnetic yoke 11 and the second magnetic yoke 12 can be adjusted arbitrarily, thereby achieving stress measurement in more directions.

[0058] In some embodiments, the first magnetic yoke 11 and the second magnetic yoke 12 are both U-shaped magnetic conductive yokes.

[0059] It should be understood that the first magnetic yoke 11 and the second magnetic yoke 12 have different sizes, and the U-shaped magnetic yoke is more convenient for exciting multiple magnetic fields. In other embodiments, the first magnetic yoke 11 and the second magnetic yoke 12 can also be gate-shaped magnetic yokes or arc-shaped magnetic yokes.

[0060] In some embodiments, referring to FIG2 , FIG2 is a schematic diagram of a three-dimensional structure of a yoke assembly of a multi-directional stress detection sensor. The first yoke 11 includes a first yoke leg 111, a first yoke connecting portion 112, and a second yoke leg 113, with the first yoke connecting portion 112 having two ends connected to the first yoke leg 111 and the second yoke leg 113, respectively. The second yoke 12 includes a third yoke leg 121, a second yoke connecting portion 122, and a fourth yoke leg 123, with the second yoke connecting portion 122 having two ends connected to the third yoke leg 121 and the fourth yoke leg 123, respectively. The first yoke connecting portion 112 and the second yoke connecting portion 122 intersect with each other.

[0061] The first magnetic yoke connecting parts 112 and the first magnetic yoke connecting parts 112 intersect with each other so that the magnetic fields are not affected and the stress values ​​in multiple directions are easily calculated.

[0062] In some embodiments, the first coil 21 , the second coil 22 , the third coil 23 and the fourth coil 24 are all connected to an AC power source and are respectively connected to the first yoke leg 111 , the second yoke leg 113 , the third yoke leg 121 and the fourth yoke leg 123 .

[0063] The first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 can generate an alternating magnetic field in the magnetic yoke group after an alternating current is passed through them, and form a magnetic circuit with the pipeline test piece, facilitating rapid and accurate detection.

[0064] In some embodiments, the spacing between the first yoke leg 111 and the third yoke leg 121 , the spacing between the third yoke leg 121 and the second yoke leg 113 , the spacing between the second yoke leg 113 and the fourth yoke leg 123 , and the spacing between the fourth yoke leg 123 and the first yoke leg 111 are all equal, which makes it easier to calculate the stress value.

[0065] In some embodiments, the first magnetic yoke 11 and the second magnetic yoke 12 are not connected, and a gap is provided between the bottom surface of the first magnetic yoke connecting portion 112 and the top surface of the second magnetic yoke connecting portion 122 .

[0066] The gap can reduce the occurrence of magnetic field coupling between the first magnetic yoke and the second magnetic yoke.

[0067] Some embodiments of the present application further provide a multi-directional stress detection method, which is applied to the multi-directional stress detection sensor described above. The method includes:

[0068] Exciting the third coil 23 and the fourth coil 24 in opposite directions;

[0069] obtaining a first excitation voltage and a first excitation frequency;

[0070] Collecting the first magnetic field signal and the second magnetic field signal through the fifth magnetic sensor 35;

[0071] A first direction stress value is calculated according to the first excitation voltage, the first excitation frequency, the first magnetic field signal and the second magnetic field signal.

[0072] It should be understood that the acquisition of the excitation voltage and excitation frequency is related to the current excited by the AC power supply. The same excitation voltage and excitation frequency can be used to measure stress in multiple directions. The first direction can be the X direction. When it is necessary to measure stress in the X direction, the AC power supply excites the third coil 23 and the fourth coil 24 in opposite directions. The first excitation voltage V and the first excitation frequency f are obtained, and the first magnetic field signal Bx and the second magnetic field signal By of the fifth magnetic sensor 35 are collected. The magnetic field direction is shown in FIG3 , which is a schematic diagram of the stress magnetic field direction in the first direction in a multi-directional stress detection method.

[0073] The above method can enable the multi-directional stress detection sensor to detect the stress value in the first direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0074] In some embodiments, the method further comprises:

[0075] Exciting the first coil 21 and the second coil 22 in opposite directions;

[0076] Acquire a second excitation voltage and a second excitation frequency;

[0077] Collecting the first magnetic field signal and the second magnetic field signal through the fifth magnetic sensor 35;

[0078] A second direction stress value is calculated according to the second excitation voltage, the second excitation frequency, the first magnetic field signal and the second magnetic field signal.

[0079] It should be understood that the second direction can be the Y direction. When it is necessary to measure the stress in the Y direction, the first coil 21 and the second coil 22 are excited by an AC power supply, and the excitation directions of the first coil 21 and the second coil 22 are opposite. The second excitation voltage V and the second excitation frequency f are obtained, and the first magnetic field signal Bx and the second magnetic field signal By of the fifth magnetic sensor 35 are collected. The direction of the magnetic field is shown in Figure 4, which is a schematic diagram of the direction of the stress magnetic field in the second direction in a multi-directional stress detection method.

[0080] The above method can enable the multi-directional stress detection sensor to detect the stress value in the second direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0081] In some embodiments, the method further comprises:

[0082] Excite the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24, and make the excitation direction of the first coil 21 and the fourth coil 24 opposite to that of the second coil 22 and the third coil 23;

[0083] obtaining a third excitation voltage and a third excitation frequency;

[0084] Collecting the third magnetic field signal and the fourth magnetic field signal by the first magnetic sensor 31 and the second magnetic sensor 32;

[0085] A stress value in a third direction is calculated according to the third excitation voltage, the third excitation frequency, the third magnetic field signal, and the fourth magnetic field signal.

[0086] It should be understood that the third direction may be the X1 direction, and X1 may be at 45° with respect to the X axis.

[0087] When it is necessary to measure the stress in the X1 direction, excitation is applied to the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 through an AC power supply, and the excitation directions of the first coil 21 and the fourth coil 24 are opposite to those of the second coil 22 and the third coil 23. The third excitation voltage V and the third excitation frequency f are obtained, and the third magnetic field signal Bx1 and the fourth magnetic field signal By1 of the first magnetic sensor 31 and the second magnetic sensor 32 are collected. The direction of the magnetic field is shown in Figure 5, which is a schematic diagram of the direction of the stress magnetic field in the third direction in a multi-directional stress detection method.

[0088] The above method can enable the multi-directional stress detection sensor to detect the stress value in the third direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0089] In some embodiments, the method further comprises:

[0090] Excite the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24, and make the second coil 22 and the fourth coil 24 excited in opposite directions to the first coil 21 and the third coil 23;

[0091] obtaining a fourth excitation voltage and a fourth excitation frequency;

[0092] The fifth magnetic field signal and the sixth magnetic field signal are collected by the third magnetic sensor 33 and the fourth magnetic sensor 34;

[0093] A fourth direction stress value is calculated according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal, and the sixth magnetic field signal.

[0094] It should be understood that the fourth direction may be the Y1 direction, and Y1 may be at an angle of 135° to the X axis.

[0095] When it is necessary to measure the stress in the Y1 direction, excitation is applied to the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 through an AC power supply, and the excitation directions of the second coil 22 and the fourth coil 24 are opposite to the excitation directions of the first coil 21 and the third coil 23. The fourth excitation voltage V and the fourth excitation frequency f are obtained, and the fifth magnetic field signal Bx2 and the sixth magnetic field signal By2 of the third magnetic sensor 33 and the fourth magnetic sensor 34 are collected. The direction of the magnetic field is shown in Figure 6, which is a schematic diagram of the direction of the stress magnetic field in the fourth direction in a multi-directional stress detection method.

[0096] The above method can enable the multi-directional stress detection sensor to detect the stress value in the fourth direction on the pipeline test piece, which is not only faster and more accurate, but also will not damage the pipeline test piece.

[0097] It can be seen from the above technical solutions that the embodiment of the present application provides a multi-directional stress detection sensor and a detection method. The multi-directional stress detection sensor includes: a magnetic yoke group, an excitation coil group and a magnetic sensitive sensor group; the magnetic yoke group includes a first magnetic yoke 11 and a second magnetic yoke 12, the first magnetic yoke 11 and the second magnetic yoke 12 intersect each other, and the bottom of the magnetic sensitive sensor group and the two ends of the first magnetic yoke 11 and the second magnetic yoke 12 are located on the surface to be tested of the pipe specimen; the excitation coil group includes a first coil 21, a second coil 22, a third coil 23 and a fourth coil 24; the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24; The first and second magnetic yokes 11, 12 are connected to the first and second magnetic yokes 11, 12, respectively. The magnetic sensor group includes a first magnetic sensor 31, a second magnetic sensor 32, a third magnetic sensor 33, a fourth magnetic sensor 34, and a fifth magnetic sensor 35. The first, second, third, and fourth magnetic sensors 31, 32, 33, and 34 are located at the midpoint of a line connecting adjacent legs of the first and second magnetic yokes 11, 12, respectively. The fifth magnetic sensor 35 is located at the midpoint of a line connecting diagonal legs of the first and second magnetic yokes 11, 12. By changing the current flow pattern of the coils, a magnetic field is excited in the pipeline specimen, and the magnetic field changes are collected by the magnetic sensor group to solve the problem of inability to accurately measure multi-directional stress.

[0098] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A multi-directional stress detection sensor, characterized in that: include: Magnetic yoke group, excitation coil group and magnetic sensor group; The magnetic yoke group comprises a first magnetic yoke (11) and a second magnetic yoke (12), the first magnetic yoke (11) and the second magnetic yoke (12) intersecting each other, and the bottom of the magnetic sensor group and the two ends of the first magnetic yoke (11) and the second magnetic yoke (12) are located on the surface to be tested of the pipeline test piece; The excitation coil group comprises a first coil (21), a second coil (22), a third coil (23) and a fourth coil (24); the first coil (21), the second coil (22), the third coil (23) and the fourth coil (24) are respectively connected to both ends of the first magnetic yoke (11) and the second magnetic yoke (12); The magnetic sensor group comprises a first magnetic sensor (31), a second magnetic sensor (32), a third magnetic sensor (33), a fourth magnetic sensor (34) and a fifth magnetic sensor (35); the first magnetic sensor (31), the second magnetic sensor (32), the third magnetic sensor (33) and the fourth magnetic sensor (34) are respectively arranged at the midpoint of a line connecting adjacent legs of the first magnetic yoke (11) and the second magnetic yoke (12); and the fifth magnetic sensor (35) is arranged at the midpoint of a line connecting diagonal legs of the first magnetic yoke (11) and the second magnetic yoke (12).

2. The multi-directional stress detection sensor according to claim 1, characterized in that: The first magnetic yoke (11) and the second magnetic yoke (12) are both U-shaped magnetic conductive yokes.

3. The multi-directional stress detection sensor according to claim 2, characterized in that: The first yoke (11) includes a first yoke leg (111), a first yoke connecting portion (112) and a second yoke leg (113), and the two ends of the first yoke connecting portion (112) are respectively connected to the first yoke leg (111) and the second yoke leg (113); the second yoke (12) includes a third yoke leg (121), a second yoke connecting portion (122) and a fourth yoke leg (123), and the two ends of the second yoke connecting portion (122) are respectively connected to the third yoke leg (121) and the fourth yoke leg (123); the first yoke connecting portion (112) and the second yoke connecting portion (122) cross each other.

4. The multi-directional stress detection sensor according to claim 3, characterized in that: The first coil (21), the second coil (22), the third coil (23) and the fourth coil (24) are all connected to an AC power supply and are respectively sleeved with the first yoke leg (111), the second yoke leg (113), the third yoke leg (121) and the fourth yoke leg (123) in sequence.

5. The multi-directional stress detection sensor according to claim 3, characterized in that: The spacing between the first yoke leg (111) and the third yoke leg (121), the spacing between the third yoke leg (121) and the second yoke leg (113), the spacing between the second yoke leg (113) and the fourth yoke leg (123), and the spacing between the fourth yoke leg (123) and the first yoke leg (111) are all equal.

6. The multi-directional stress detection sensor according to claim 3, characterized in that: The first magnetic yoke (11) and the second magnetic yoke (12) are not connected, and a gap is provided between the bottom surface of the first magnetic yoke connecting portion (112) and the top surface of the second magnetic yoke connecting portion (122).

7. A multi-directional stress detection method, characterized in that: The multi-directional stress detection sensor according to any one of claims 1 to 6, wherein the method comprises: Exciting the third coil (23) and the fourth coil (24), and making the excitation directions of the third coil (23) and the fourth coil (24) opposite; obtaining a first excitation voltage and a first excitation frequency; collecting the first magnetic field signal and the second magnetic field signal through a fifth magnetic sensor (35); A first directional stress value is calculated according to the first excitation voltage, the first excitation frequency, the first magnetic field signal, and the second magnetic field signal.

8. The multi-directional stress detection method according to claim 7, characterized in that: The method further comprises: Exciting the first coil (21) and the second coil (22), and making the excitation directions of the first coil (21) and the second coil (22) opposite; Acquire a second excitation voltage and a second excitation frequency; collecting the first magnetic field signal and the second magnetic field signal through the fifth magnetic sensor (35); A second directional stress value is calculated according to the second excitation voltage, the second excitation frequency, the first magnetic field signal, and the second magnetic field signal.

9. The multi-directional stress detection method according to claim 8, characterized in that: The method further comprises: Exciting the first coil (21), the second coil (22), the third coil (23), and the fourth coil (24), and making the excitation directions of the first coil (21) and the fourth coil (24) opposite to those of the second coil (22) and the third coil (23); obtaining a third excitation voltage and a third excitation frequency; collecting a third magnetic field signal and a fourth magnetic field signal through a first magnetic sensor (31) and a second magnetic sensor (32); A stress value in a third direction is calculated according to the third excitation voltage, the third excitation frequency, the third magnetic field signal, and the fourth magnetic field signal.

10. The multi-directional stress detection method according to claim 8, characterized in that: The method further comprises: Exciting the first coil (21), the second coil (22), the third coil (23), and the fourth coil (24), and making the excitation directions of the second coil (22) and the fourth coil (24) opposite to those of the first coil (21) and the third coil (23); obtaining a fourth excitation voltage and a fourth excitation frequency; collecting a fifth magnetic field signal and a sixth magnetic field signal through a third magnetic sensor (33) and a fourth magnetic sensor (34); A fourth direction stress value is calculated according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal, and the sixth magnetic field signal.

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