A three-dimensional orthogonal magnetization electromagnetic thermal imaging detection device for pipeline full-morphology defects
Through three-way orthogonal magnetization and high-frequency excitation technology, the problem of insufficient defect direction sensitivity in the existing pipeline defect detection methods is solved, and efficient and accurate detection of arbitrary direction defects is achieved, which is suitable for automated detection of all-form defects in pipelines.
Patent Information
- Application Number
- CN202411206496.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2044-08-30
AI Technical Summary
The existing pipeline defect detection methods are difficult to achieve high sensitivity detection of arbitrary defects, and are complex in operation, difficult to accurately locate, and cannot guarantee detection efficiency and accuracy.
Design a three-way orthogonal magnetization full-form defect electromagnetic thermal imaging detection device, adopting three sets of orthogonal magnetization coils and AC excitation coils, and forming a full-directional magnetization field through vector superposition of magnetization fields and high-frequency excitation, combined with infrared thermal imaging The instrument realizes contactless detection.
It realizes high sensitivity and rapid detection of arbitrary direction defects, avoids the skin depth and direction limitations in traditional methods, improves detection efficiency and accuracy, is simple in structure and low in cost, and is suitable for automated large-area inspection of all-form defects in pipelines.
Smart Images
Figure CN118706936B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of pipeline defect detection, and specifically relates to the design of a pipeline full-morphology defect electromagnetic thermal imaging detection device with three-way orthogonal magnetization. Background Art
[0002] In recent years, ferromagnetic pipelines have often been used as pressure-bearing devices for transporting fluid products such as oil and natural gas. Safety accidents are common, so it is particularly important to ensure their safe service during use. If pipeline defects are not effectively detected before leaving the factory, after the damaged pipeline is put into service, it is very easy to cause safety accidents such as pipeline rupture or even explosion under the action of complex loads and corrosive media, causing casualties and economic losses. In this regard, non-destructive testing technology can be used to conduct quality inspections on pipelines to ensure pipeline quality and service safety.
[0003] Eddy current thermal imaging detection method has the characteristics of direct imaging visualization, non-contact, and large lift-off, and is widely used in the quality inspection process of pipelines. The traditional eddy current thermal imaging method detects pipeline defects through the non-uniform temperature distribution caused by the induced eddy current disturbance caused by the defect. Due to the skin effect of the induced eddy current, the traditional eddy current thermal imaging method cannot detect and quantitatively evaluate deeply buried defects. At present, there is a magnetized eddy current thermal imaging detection method that uses a set of DC magnetizers to generate a magnetic field parallel to the pipeline axis to magnetize the pipeline, thereby causing the magnetic permeability distribution at the defect location to be distorted, causing non-uniform surface temperature distribution, thereby realizing the detection and quantitative evaluation of surface defects on the pipeline. However, according to the perpendicular magnetization theory, when the defect direction is perpendicular to the DC magnetic field direction, the magnetic field distortion at the defect is the largest, the magnetic permeability distortion is the largest, and the defect detection sensitivity is also the highest. With the deviation of the defect direction, the DC magnetic field distortion gradually decreases. When the defect is parallel to the DC magnetic field, the DC magnetic field distortion is close to zero. Therefore, the magnetized eddy current thermal imaging detection device with a single DC magnetization direction can only change the magnetization direction through the relative movement of the pipeline and the magnetic field, such as the pipeline through spiral motion to achieve high-sensitivity detection of defects in any direction. The actual operation is difficult, and it is difficult to accurately locate the defects, and it cannot guarantee that the detection sensitivity of defects in any direction is the same. Summary of the invention
[0004] The purpose of the present invention is to solve the problems that the existing methods are difficult to operate in practice, it is difficult to accurately locate defects, and it is impossible to ensure that the detection sensitivity of defects in any direction is the same. A three-way orthogonal magnetization pipeline full-morphology defect electromagnetic thermal imaging detection device is proposed.
[0005] The technical solution of the present invention is: a three-way orthogonal magnetization pipeline full-morphology defect electromagnetic thermal imaging detection device, comprising two conveying wheels, an infrared thermal imager, a computer, an AC excitation coil and a three-way orthogonal magnetization coil; the three-way orthogonal magnetization coil comprises a first orthogonal magnetization coil, a second orthogonal magnetization coil and a third orthogonal magnetization coil; the two conveying wheels are respectively located on both sides of the first orthogonal magnetization coil; the infrared thermal imager is communicatively connected to the computer; the central axis of the AC excitation coil coincides with the central axis of the pipeline to be tested; the first orthogonal magnetization coil, the second orthogonal magnetization coil and the third orthogonal magnetization coil are orthogonal to each other, the central axis of the first orthogonal magnetization coil and the central axis of the third orthogonal magnetization coil are both perpendicular to the central axis of the pipeline to be tested, and the central axis of the second orthogonal magnetization coil coincides with the central axis of the pipeline to be tested; the AC excitation coil is located in the middle of the first orthogonal magnetization coil and is coaxial with the first orthogonal magnetization coil.
[0006] The beneficial effects of the present invention are:
[0007] 1. Through the vector superposition of the magnetic fields generated by the three-way orthogonal magnetizer, a full-strike magnetic field can be formed inside the pipeline, so that any defect in the pipeline can stimulate the maximum thermal response distortion temperature distribution signal and be picked up by the thermal imager array, thereby realizing high-sensitivity and rapid detection of defects in any direction, with stable performance, simple structure and low cost.
[0008] 2. During the detection process, the three-way orthogonal magnetizer forms a magnetizing loop through the air and the pipeline to generate DC magnetic fields in different directions, uses the induced eddy current generated by the high-frequency excitation coil close to the pipeline to form thermal excitation, and uses the thermal imager array to pick up the uniform temperature distribution information. The device does not need to contact the pipeline surface, and will not cause friction and scratches to the pipeline during the detection process. At the same time, the non-contact detection method can improve the detection efficiency and realize the rapid detection of pipeline defects.
[0009] 3. The present invention breaks through the limitations of traditional eddy current thermal imaging on the skin depth of defects and the limitations of ordinary magnetized eddy current thermal imaging methods on the direction of defects. It can realize automated large-area rapid detection of all-morphological defects in pipelines, playing an important role in the safe operation and quality control of pipelines.
[0010] Preferably, the first orthogonal magnetizing coil, the second orthogonal magnetizing coil and the third orthogonal magnetizing coil are respectively composed of two groups of Helmholtz ring coils with the same radius and the same central axis.
[0011] The beneficial effects of the above preferred solution are:
[0012] Each set of orthogonal magnetizing coils consists of two sets of Helmholtz ring coils with the same radius and the same central axis, ensuring that the pipeline to be tested is magnetized in all directions, so that any defect in the pipeline can stimulate the maximum thermal response distortion temperature distribution signal.
[0013] Preferably, direct currents of the same direction and amplitude flow through the two groups of Helmholtz ring coils in each orthogonal magnetization coil.
[0014] The beneficial effects of the above preferred solution are:
[0015] The two groups of Helmholtz ring coils in each orthogonal magnetizing coil are passed through a DC current with the same direction and amplitude, ensuring that each orthogonal magnetizing coil generates the most uniform magnetic field and the maximum magnetic induction intensity, so that the pipeline to be tested can be magnetized in all directions.
[0016] Preferably, direct currents of different directions and amplitudes flow through the first orthogonal magnetizing coil, the second orthogonal magnetizing coil and the third orthogonal magnetizing coil respectively.
[0017] The beneficial effects of the above preferred solution are:
[0018] Through the vector superposition of the magnetic fields generated by the three-way orthogonal magnetizers, a full-strike magnetic field can be formed inside the pipeline, so that any defect in the pipeline can stimulate the maximum thermal response distortion temperature distribution signal and be picked up by the thermal imager array, thereby achieving high-sensitivity and rapid detection of defects in any direction.
[0019] Preferably, the diameter of the AC excitation coil is 2 larger than the diameter of the pipeline to be tested. mm -4 mm , that is, the lift-off value of the AC excitation coil is 1 mm -2 mm within the range.
[0020] The beneficial effects of the above preferred solution are:
[0021] Ensure that the lift-off value of the AC excitation coil is 1 mm -2 mm Within the range, it can not only form thermal excitation by utilizing the induced eddy current generated by the high-frequency excitation coil close to the pipeline, but also realize non-contact detection and improve the detection efficiency.
[0022] Preferably, the AC excitation coil is electrically connected to an AC excitation source, and the AC excitation source is used as a thermal excitation source, and the excitation current is set to 380 A .
[0023] The beneficial effects of the above preferred solution are:
[0024] By passing a high-frequency AC current through the AC excitation coil, an uneven surface temperature distribution of the pipeline to be tested is caused, thereby achieving high-sensitivity and rapid detection of defects in any direction, with stable performance, simple structure and low cost.
[0025] Preferably, the infrared thermal imager comprises at least two array infrared cameras; the resolution of the array infrared camera is greater than or equal to 640*480, the temperature measurement range is [-40℃, 650℃], and the thermal sensitivity is less than 0.1 K .
[0026] The beneficial effects of the above preferred solution are:
[0027] Select a resolution greater than or equal to 640*480, a temperature measurement range of [-40℃, 650℃], and a thermal sensitivity less than 0.1 K The infrared camera can accurately identify and extract the infrared data information of the pipeline to be tested, realize the location identification and depth quantification of defects to obtain the defect status of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 Shown is a schematic structural diagram of a three-way orthogonal magnetization pipeline full-morphology defect electromagnetic thermal imaging detection device.
[0029] Figure 2 The figure shows a schematic diagram of the principle of an automatic detection device for electromagnetic thermal imaging of full-morphology defects in pipelines using three-way orthogonal magnetization.
[0030] Figure 3 Shown is a schematic diagram of magnetic field vector superposition to form magnetization fields with different directions.
[0031] Explanation of the accompanying reference numerals: 1—pipeline to be tested, 2—conveying wheel, 3—infrared thermal imager, 4—computer, 5—first orthogonal magnetizing coil, 6—second orthogonal magnetizing coil, 7—third orthogonal magnetizing coil, 8—AC excitation coil. DETAILED DESCRIPTION
[0032] Now, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown and described in the accompanying drawings are only exemplary and are intended to explain the principles and spirit of the present invention, rather than to limit the scope of the present invention.
[0033] like Figure 1The device is a three-way orthogonal magnetization pipeline full-morphology defect electromagnetic thermal imaging detection device, comprising two conveying wheels 2, an infrared thermal imager 3, a computer 4, an AC excitation coil 8 and a three-way orthogonal magnetization coil; the three-way orthogonal magnetization coil comprises a first orthogonal magnetization coil 5, a second orthogonal magnetization coil 6 and a third orthogonal magnetization coil 7; the two conveying wheels 2 are respectively located on both sides of the first orthogonal magnetization coil 5; the infrared thermal imager 3 is communicatively connected with the computer 4; the central axis of the AC excitation coil 8 coincides with the central axis of the pipeline to be tested 1; the first orthogonal magnetization coil 5, the second orthogonal magnetization coil 6 and the third orthogonal magnetization coil 7 are orthogonal to each other, the central axis of the first orthogonal magnetization coil 5 and the central axis of the third orthogonal magnetization coil 7 are both perpendicular to the central axis of the pipeline to be tested 1, and the central axis of the second orthogonal magnetization coil 6 coincides with the central axis of the pipeline to be tested 1; the AC excitation coil 8 is located in the middle of the first orthogonal magnetization coil 5 and is coaxial with the first orthogonal magnetization coil 5.
[0034] In this embodiment, the first orthogonal magnetizing coil 5 , the second orthogonal magnetizing coil 6 and the third orthogonal magnetizing coil 7 are respectively composed of two groups of Helmholtz ring coils with the same radius and the same central axis.
[0035] In this embodiment, direct currents of the same direction and amplitude flow through the two groups of Helmholtz ring coils in each orthogonal magnetization coil.
[0036] In this embodiment, direct currents with different directions and amplitudes flow through the first orthogonal magnetizing coil 5 , the second orthogonal magnetizing coil 6 and the third orthogonal magnetizing coil 7 , respectively.
[0037] In this embodiment, the diameter of the AC excitation coil 8 is 2 larger than the diameter of the pipeline 1 to be tested. mm -4 mm , that is, the lift-off value of the AC excitation coil 8 is 1 mm -2 mm within the range.
[0038] In this embodiment, the AC excitation coil 8 is electrically connected to the AC excitation source, and the AC excitation source is used as a thermal excitation source. The excitation current is set to 380 A .
[0039] In this embodiment, the infrared thermal imager 3 includes at least two array infrared cameras; the resolution of the array infrared camera is greater than or equal to 640*480, the temperature measurement range is [-40℃, 650℃], and the thermal sensitivity is less than 0.1 K .
[0040] The specific working principle and process of the present invention are:
[0041] like Figure 1As shown, the pipeline 1 to be tested is sent into the detection device, and the central axis of the pipeline 1 to be tested coincides with the central axis of the second orthogonal magnetization coil 6 and the AC excitation coil 8. When direct currents of different amplitudes and directions are passed through the three-way orthogonal magnetization coils, according to the vector superposition principle, a spatial rotating magnetization field will be formed inside the pipeline 1 to be tested. When the direction of the magnetization field is perpendicular to the defect direction, a distorted magnetic field distribution with the maximum intensity will be excited inside the pipeline, thereby forming a maximum distorted magnetic permeability distribution. Under the action of the AC excitation coil 8 with high-frequency AC current, an uneven surface temperature distribution is caused, which is transmitted to the infrared thermal imager 3 array position by the conveying wheel 2. The infrared thermal imager 3 array transmits the picked-up temperature distribution information to the computer 4 for signal processing and display.
[0042] like Figure 2 As shown, the first orthogonal magnetizing coil 5, the second orthogonal magnetizing coil 6 and the third orthogonal magnetizing coil 7 are all connected to a power supply, and currents are respectively passed through them. , and , is the current amplitude. The opposing magnetizing coils form a set of Helmholtz coils, which generate three-directional magnetizing fields inside the pipe: , , , , and are the amplitudes of the three magnetizing fields respectively.
[0043] By adjusting the number of turns of the three groups of Helmholtz coils, the amplitudes of the magnetizing fields in the three directions are made the same, that is, Through the principle of magnetic field superposition, a rotating magnetic field is formed inside the pipeline, such as Figure 3 As shown, during the operation of the detection device, the direction of the magnetizing magnetic field changes continuously. When the direction of the rotating magnetizing field turns to H 1. H 2 or H When the rotating magnetization field is in the 3 direction, it is perpendicular to the defects in different directions. At this time, the maximum magnetic field distortion will be generated at the defect position, thereby causing the maximum permeability distortion distribution. In this way, the superimposed magnetization magnetic field can be used to perpendicularly magnetize defects in any direction.
[0044] At the same time, a high-frequency AC current flows through the high-frequency AC excitation coil 8, generating induced eddy currents inside the pipeline. When passing through the defect position, due to the existence of distorted magnetic permeability, non-uniform induced eddy current distribution will be generated at the defect, thereby forming a distorted thermal response temperature distribution. The temperature field distribution is obtained by the array's infrared thermal imager 3 and transmitted to the computer 4 for data processing to obtain defect information.
[0045] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.
Claims
1. A three-way orthogonal magnetization electromagnetic thermal imaging detection device for pipeline full-morphology defects, Features: The invention comprises two conveying wheels (2), an infrared thermal imager (3), a computer (4), an AC excitation coil (8) and a three-way orthogonal magnetization coil; the three-way orthogonal magnetization coil comprises a first orthogonal magnetization coil (5), a second orthogonal magnetization coil (6) and a third orthogonal magnetization coil (7); the two conveying wheels (2) are respectively located on both sides of the first orthogonal magnetization coil (5); the infrared thermal imager (3) is communicatively connected to the computer (4); the central axis of the AC excitation coil (8) is aligned with the axis of the pipeline to be measured (1); The central axes coincide with each other; the first orthogonal magnetizing coil (5), the second orthogonal magnetizing coil (6) and the third orthogonal magnetizing coil (7) are orthogonal to each other; the central axes of the first orthogonal magnetizing coil (5) and the third orthogonal magnetizing coil (7) are both perpendicular to the central axis of the pipeline to be tested (1); the central axis of the second orthogonal magnetizing coil (6) coincides with the central axis of the pipeline to be tested (1); the AC excitation coil (8) is located in the middle of the first orthogonal magnetizing coil (5) and is coaxial with the first orthogonal magnetizing coil (5); Current is passed through the first orthogonal magnetizing coil (5), the second orthogonal magnetizing coil (6) and the third orthogonal magnetizing coil (7) respectively, so as to generate magnetizing fields in three directions inside the pipeline. Based on the principle of magnetic field superposition, a rotating magnetizing field is formed inside the pipeline. During the operation of the detection device, the direction of the magnetizing magnetic field changes continuously. When the direction of the rotating magnetizing field is respectively turned to H 1 、H2 or H3 When the direction is the same, the rotating magnetization field is perpendicular to the defects in different directions, and the maximum magnetic field distortion is generated at the defect position, causing the maximum permeability distortion distribution, and realizing perpendicular magnetization for defects in any direction; The current calculation formula is: in, represents the current flowing into the first orthogonal magnetizing coil (5), represents the current flowing into the second orthogonal magnetizing coil (6), represents the current flowing into the third orthogonal magnetizing coil (7), represents the current amplitude, represents the sine function, represents the cosine function, It represents the total time of current flow. and represents the angular frequency; The calculation formulas for the magnetization fields in the three directions are: in, express Direction of the magnetic field, express The direction of the magnetic field, express The direction of the magnetic field, , and are the amplitudes of the three magnetizing fields respectively. The number of turns of the coil is adjusted to make the amplitudes of the magnetizing fields in the three directions the same, that is, ; The diameter of the AC excitation coil (8) is larger than the diameter of the pipeline (1) to be tested by 2 mm -4 mm , that is, the lift-off value of the AC excitation coil (8) is 1 mm -2 mm within the scope; The infrared thermal imager (3) comprises at least two array infrared cameras; the resolution of the array infrared camera is greater than or equal to 640*480, the temperature measurement range is [-40°C, 650°C], and the thermal sensitivity is less than 0.1 K .
2. According to the three-way orthogonal magnetization electromagnetic thermal imaging detection device for pipeline full-morphology defects according to claim 1, Features: The first orthogonal magnetizing coil (5), the second orthogonal magnetizing coil (6) and the third orthogonal magnetizing coil (7) are respectively composed of two groups of Helmholtz ring coils with the same radius and the same central axis.
3. According to the three-way orthogonal magnetization electromagnetic thermal imaging detection device for pipeline full-morphology defects in claim 2, Features: Direct currents with the same direction and amplitude flow through the two groups of Helmholtz ring coils in each orthogonal magnetization coil.
4. According to the three-way orthogonal magnetization pipeline full-morphology defect electromagnetic thermal imaging detection device of claim 1, Features: Direct currents of different directions and amplitudes flow through the first orthogonal magnetizing coil (5), the second orthogonal magnetizing coil (6) and the third orthogonal magnetizing coil (7).
5. According to the three-way orthogonal magnetization electromagnetic thermal imaging detection device for pipeline full-morphology defects according to claim 1, Features: The AC excitation coil (8) is electrically connected to an AC excitation source, and the AC excitation source is used as a thermal excitation source. The excitation current is set to 380 A .