Visual electromagnetic composite defect detection probe and method

Abstract

The invention discloses a visual electromagnetic composite defect detection probe and method.The visual electromagnetic composite defect detection probe comprises a probe shell (1), a magnetic detection sensor (3) and a lens (8), the probe shell (1) comprises a connecting shell body (11) and a lower shell body (12), the connecting shell body (11) is connected with the lower shell body (12), the magnetic detection sensor (3) is connected to the lower shell body (12), and the lower shell body (12) is connected with the magnetic detection sensor (3). The lens (8) is connected to the connecting shell (11), the movement direction of the detection probe in the detection process serves as the first direction, the direction perpendicular to the surface to be detected and pointing to the surface to be detected serves as the second direction, and the magnetic detection sensor (3) and the lens (8) are located in a detection plane determined by the first direction and the second direction. The lower shell is in a wedge shape, the lower shell is in the shape with the sectional area gradually reduced in the second direction, and the lower shell is arranged in the first direction.

Description

Technical Field

[0001] The present invention relates to the field of nondestructive testing, and in particular to a visual electromagnetic composite defect detection probe and method. Background Art

[0002] Welding is an important construction method in the construction process of nuclear power plants. The quality of welded joints has an important impact on the reliability of the construction and installation of nuclear facilities, and directly affects the safe operation of nuclear power plants. With the gradual increase in the number of nuclear power plants under construction, the safety of nuclear power projects has received more and more attention from all parties. At present, the main non-destructive testing technologies used in nuclear power projects under construction include radiographic testing (RT), ultrasonic testing (UT), penetrant testing (PT), eddy current testing, magnetic particle testing, etc. Among them, the application proportion of radiographic testing is relatively large, and its main advantage is that it is easy to detect volume defects inside the weld. However, in actual engineering construction, for some important welded structures, it is often encountered that the design stipulates that the welds should be tested for internal volume (radiographic testing or ultrasonic testing), but due to the weld structure and material reasons (such as some corner joints, branch pipe saddle-shaped welded joints or thick stainless steel welded joints, etc.), it is impossible to implement it according to conventional radiographic testing or ultrasonic testing standards. In the nuclear power construction specification RCC-M, for full penetration fillet welds of non-pipeline types, if radiographic testing and ultrasonic testing cannot be performed after welding, they shall be carried out according to the corresponding requirements during the welding process. During the welding process, only surface inspection (three-layer penetration inspection or magnetic particle inspection) is generally carried out. However, surface inspection can only detect open defects on the weld surface and cannot detect internal defects. Therefore, if there are no other compensation measures, defects may be missed. If only electromagnetic inspection is used, the undulation problem of the surface to be inspected may be ignored.

[0003] Patent document CN114113337B discloses an electromagnetic ultrasonic flexible array probe and a detection method for curved surface structure defect detection. The probe consists of an electromagnetic ultrasonic bias magnetic field unit, an electromagnetic ultrasonic excitation unit, an electromagnetic ultrasonic detection unit, and a flexible substrate. The electromagnetic ultrasonic excitation unit and the electromagnetic ultrasonic detection unit are respectively composed of two or more coils in a certain array, which are used to enhance the excitation and receiving signals, and can effectively improve the detection capability and efficiency of curved surface structures. The flexible probe can be widely used in non-destructive testing of components with complex surface shapes and workpieces with narrow detection space, expanding the application scope of ultrasonic non-destructive testing technology, but does not solve the problem that the undulation of the surface to be detected may be ignored by electromagnetic detection alone.

[0004] In the patent document CN116429700A, a laser electromagnetic ultrasonic defect detection system for additive titanium alloy and a laser electromagnetic ultrasonic SAFT imaging detection method are disclosed. The defect detection system includes a signal excitation unit, a signal receiving unit, an optical trigger circuit and an industrial computer; the optical trigger circuit is respectively connected to the signal excitation unit and the signal receiving unit to obtain the initial signal and feed back the obtained trigger signal to the signal receiving unit. The emission of the pulsed laser is completed by the laser control system in the industrial computer, and the deflection of the light source is controlled by the scanning dot matrix program or the two-dimensional scanning translation stage to realize the laser source scanning of the predetermined path, the excitation and reception of the ultrasonic signal, and the collected data is transmitted to the host computer after the array data of the scan is passed through the synthetic aperture focusing imaging algorithm program, and finally the image reconstruction of the internal defects of the test block is completed, but the problem that the undulation of the surface to be detected may be ignored by electromagnetic detection alone is not solved. Summary of the invention

[0005] Based on the above technical problems, the present invention proposes a visual electromagnetic composite defect detection probe and method to solve the problem that the undulations of the surface to be detected may be ignored by electromagnetic detection alone.

[0006] To achieve the above objectives, the present invention proposes a visual electromagnetic composite defect detection probe.

[0007] A visual electromagnetic composite defect detection probe:

[0008] The invention comprises a probe housing, a magnetic detection sensor and a lens. The probe housing comprises a connecting shell and a lower shell. The connecting shell is connected to the lower shell. The magnetic detection sensor is connected to the lower shell. The lens is connected to the connecting shell.

[0009] The movement direction of the detection probe during the detection process is taken as the first direction, and the direction perpendicular to the surface to be detected and pointing to the surface to be detected is taken as the second direction. The magnetic detection sensor and the lens are located in a detection plane determined by the first direction and the second direction. The lower shell is wedge-shaped, and the lower shell has a shape with a gradually decreasing cross-sectional area along the second direction. The lower shell is arranged along the first direction.

[0010] Furthermore, the connection shell includes a signal amplifier module, and the signal amplifier module is fixed inside the connection shell.

[0011] Furthermore, the connecting shell includes a probe gland, and the probe gland and the connecting shell are fixed to each other.

[0012] Furthermore, the connecting shell also includes an aviation plug, and the aviation plug is vertically connected to the probe gland along the second direction.

[0013] Furthermore, the connection shell comprises a connection shell groove, and the connection shell groove is located in the detection plane determined by the first direction and the second direction and is placed on one side of the exterior of the connection shell.

[0014] Furthermore, the connection housing groove includes the lens, and the lens is arranged in the connection housing groove.

[0015] Furthermore, the connection housing groove further includes a SMD LED, and the SMD LED is arranged in the connection housing groove.

[0016] Furthermore, the connection shell comprises a connection shell slot, and the connection shell slot is disposed on one side of the exterior of the connection shell.

[0017] Furthermore, the connecting shell slot also includes a lens circuit board, and the lens circuit board is arranged in the connecting shell slot.

[0018] Furthermore, the lower shell is connected to the connecting shell via a plane with the largest wedge-shaped cross-sectional area.

[0019] Furthermore, the lower shell includes a probe detection groove and a probe excitation groove, the probe detection groove and the probe excitation groove are located in the connecting shell, and the probe excitation groove is located inside the lower shell compared to the probe detection groove.

[0020] Furthermore, the probe detection groove includes the magnetic detection sensor, and the magnetic detection sensor is arranged in the probe detection groove.

[0021] Furthermore, the probe excitation groove comprises a magnetic core, and the magnetic core is arranged in the probe excitation groove.

[0022] To achieve the above objectives, the present invention also proposes a visual electromagnetic composite defect detection method.

[0023] A visual electromagnetic composite defect detection method, characterized by comprising:

[0024] S1: Continuously collect the video, Bx channel signal and Bz channel signal of the weld seam of the test piece through the lens and magnetic detection sensor;

[0025] S2: performing noise reduction processing on the Bx channel signal and the Bz channel signal, and drawing a signal curve;

[0026] S3: judging whether it is a defect signal according to the signal curve and the video of the welding seam;

[0027] S4: Send out defect information.

[0028] Furthermore, the step S3 includes:

[0029] A threshold signal is set. If the Bz channel signal in the signal curve is greater than the threshold signal, the Bz channel signal is re-collected three times to obtain a verification Bz channel signal. If the verification Bz channel signal is consistent with the Bz channel signal in the signal curve, it is determined to be the defect signal.

[0030] Furthermore, the step S3 further includes:

[0031] If the Bz channel signal in the signal curve is less than the threshold signal and / or the verification Bz channel signal is inconsistent, the Bx channel signal in the signal curve is judged. If it is greater than the threshold signal, the surface undulation of the test piece is judged through the video at the welding seam. If the surface undulation of the test piece is less than or equal to 1 mm, it is determined to be the defect signal.

[0032] If the surface undulation of the test piece is greater than 1mm, determine whether it is a non-correlated display. If so, it is determined to be qualified. If it is not a non-correlated display, re-collect the Bx channel signal three times to obtain a verification Bx channel signal. If the verification Bx channel signal is consistent with the Bx channel signal in the signal curve, it is determined to be the defect signal.

[0033] Furthermore, the non-related display includes:

[0034] The non-correlated displays include checking for operating errors, checking for equipment noise, checking for material properties, and checking for surface conditions.

[0035] Furthermore, the step S4 includes:

[0036] The defect information includes the defect signal and the corresponding key frame of the video at the welding seam.

[0037] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0038] 1. The present invention proposes a visual electromagnetic composite defect detection probe. The probe structure and internal circuit are redesigned and optimized so that the probe can adapt to narrow spaces and achieve perfect matching with the narrow part of the layered welding seam. This design improvement significantly improves the applicability and flexibility of the detection probe in complex welding structures, ensuring the efficiency and accuracy of the detection process.

[0039] 2. The present invention combines electromagnetic detection and visual detection to achieve efficient and accurate detection of defects in narrow areas of layered welding seams. Electromagnetic detection uses the acquisition and processing of Bx and Bz channel signals, combined with signal curves and default thresholds to determine defects, while visual detection provides an intuitive defect identification method through video recording and image acquisition. This composite detection method not only improves the accuracy of detection, but also improves the detection efficiency.

[0040] 3. The present invention provides a visual electromagnetic composite defect detection method, including signal acquisition, processing, defect judgment and final acceptance process. By setting clear detection steps and standards, the standardization of the detection process is achieved, the interference of human factors is reduced, and the consistency and reliability of the detection results are improved.

[0041] 4. The technical solution of the present invention achieves a comprehensive improvement in the quality of welded joints by optimizing the probe structure, innovating the detection method, standardizing the detection process, and integrating the detection equipment. These technical improvements not only improve the detection quality of welded joints, but also indirectly improve the safety and reliability of important facilities such as nuclear power plants, and have important practical value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 A cross-sectional view of a visual electromagnetic composite defect detection probe according to an embodiment is shown;

[0044] Figure 2 A three-dimensional structure diagram of a visual electromagnetic composite defect detection probe according to an embodiment is shown;

[0045] Figure 3 A flow chart of a visual electromagnetic composite defect detection method according to an embodiment is shown.

[0046] The above-mentioned drawings include the following reference numerals:

[0047] 1. Probe housing; 2. Magnetic core; 3. Magnetic detection sensor; 4. Signal amplification module; 5. Aviation plug; 6. Probe gland; 7. Fixing screw hole; 8. Lens;

[0048] 11. Connecting shell; 12. Lower shell;

[0049] 111, connection shell groove; 112, connection shell slot; 113, lens circuit board; 114, SMD LED;

[0050] 121. The probe detects the groove; 122. The probe excites the groove. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0053] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] Example

[0055] The present invention proposes a visual electromagnetic composite defect detection probe, combined with Figure 1 and Figure 2 As shown, it includes a probe housing 1, a magnetic detection sensor 3 and a lens 8. The probe housing 1 includes a connecting shell 11 and a lower shell 12. The connecting shell 11 is connected to the lower shell 12. The magnetic detection sensor 3 is connected to the lower shell 12. The lens 8 is connected to the connecting shell 11.

[0056] The movement direction of the detection probe during the detection process is taken as the first direction, and the direction perpendicular to the surface to be detected and pointing to the surface to be detected is taken as the second direction. The magnetic detection sensor 3 and the lens 8 are located in the detection plane determined by the first direction and the second direction. The lower shell is wedge-shaped, and the lower shell has a shape with a gradually decreasing cross-sectional area along the second direction. The lower shell is arranged along the first direction.

[0057] Furthermore, the signal amplification module 4 is fixed to the inside of the probe housing 1 by hot melt adhesive, the probe cover 6 is fixed to the probe housing 1 by threaded assembly, the aviation plug 5 is installed in the inside of the probe housing 1 by interference fit with the cylindrical mounting hole and is connected to one side of the probe cover 6, the connecting shell 11 is connected to the lower shell 12 by screws, the connecting shell groove 111 is installed along the movement direction of the probe, the lens 8 and the chip LED 114 are installed inside the connecting shell groove 111, the back is a mirror connecting shell slot 112, and the lens circuit board 11 is placed in the connecting shell slot 112.

[0058] Furthermore, if Figure 3 As shown, when defects at a welding seam are detected, the aviation plug 5 is connected to a signal excitation device and a signal acquisition device. The aviation plug 5 transmits the excitation signal to the magnetic core 2, and the magnetic core 2 excites a uniform current in the probe detection groove 121 of the probe. The magnetic detection sensor 3 amplifies the magnetic signal of the tiny defect at the narrow part of the weld detected by the signal amplification module 4, and transmits it to the signal acquisition device through the aviation plug 5, so as to realize the acquisition of the defect signal at the welding seam.

[0059] Preferably, the patch LED 114 is close to the lens 8 so that the lens 8 can achieve high resolution, high frame rate, small size and close-range imaging requirements, and the collected video image information is transmitted to the PC end via USB through the lens circuit board 113.

[0060] To achieve the above object, the present invention further proposes a visual electromagnetic composite defect detection method, using the visual electromagnetic composite defect detection probe described above, comprising the following steps:

[0061] S1: The video, Bx channel signal and Bz channel signal of the weld seam of the test piece are continuously collected through the lens 8 and the magnetic detection sensor 3 respectively.

[0062] S2: performing noise reduction processing on the Bx channel signal and the Bz channel signal, and drawing a signal curve.

[0063] S3: Determine whether it is a defect signal based on the signal curve and the video of the welding seam.

[0064] S4: Send out defect information.

[0065] In a specific implementation, the lens 8 and the magnetic detection sensor 3 can simultaneously collect data on the surface to be detected, or the lens 8 can be used to collect video data and save it, and then the magnetic detection sensor 3 can be used to collect Bx and Bz channel signals.

[0066] Furthermore, the step S3 further includes:

[0067] If the Bz channel signal in the signal curve is less than the threshold signal and / or the verification Bz channel signal is inconsistent, the Bx channel signal in the signal curve is judged. If it is greater than the threshold signal, the surface undulation of the test piece is judged through the video at the welding seam. If the surface undulation of the test piece is less than or equal to 1 mm, it is determined to be the defect signal.

[0068] If the surface undulation of the test piece is greater than 1mm, determine whether it is a non-correlated display. If so, it is determined to be qualified. If it is not a non-correlated display, re-collect the Bx channel signal three times to obtain a verification Bx channel signal. If the verification Bx channel signal is consistent with the Bx channel signal in the signal curve, it is determined to be the defect signal.

[0069] Furthermore, the non-related display includes:

[0070] The non-correlated displays include checking for operating errors, checking for equipment noise, checking for material properties, and checking for surface conditions.

[0071] Furthermore, the step S4 includes:

[0072] The defect information includes the defect signal and the key of the corresponding video at the welding seam.

[0073] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0074] 1. The present invention proposes a visual electromagnetic composite defect detection probe. The probe structure and internal circuit are redesigned and optimized so that the probe can adapt to narrow spaces and achieve perfect matching with the narrow part of the layered welding seam. This design improvement significantly improves the applicability and flexibility of the detection probe in complex welding structures, ensuring the efficiency and accuracy of the detection process.

[0075] 2. The present invention combines electromagnetic detection and visual detection to achieve efficient and accurate detection of defects in narrow areas of layered welding seams. Electromagnetic detection uses the acquisition and processing of Bx and Bz channel signals, combined with signal curves and default thresholds to determine defects, while visual detection provides an intuitive defect identification method through video recording and image acquisition. This composite detection method not only improves the accuracy of detection, but also improves the detection efficiency.

[0076] 3. The present invention provides a visual electromagnetic composite defect detection method, including signal acquisition, processing, defect judgment and final acceptance process. By setting clear detection steps and standards, the standardization of the detection process is achieved, the interference of human factors is reduced, and the consistency and reliability of the detection results are improved.

[0077] 4. The technical solution of the present invention achieves a comprehensive improvement in the quality of welded joints by optimizing the probe structure, innovating the detection method, standardizing the detection process, and integrating the detection equipment. These technical improvements not only improve the detection quality of welded joints, but also indirectly improve the safety and reliability of important facilities such as nuclear power plants, and have important practical value and broad application prospects.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A visual electromagnetic composite defect detection probe, characterized in that: The invention comprises a probe housing (1), a magnetic detection sensor (3) and a lens (8), wherein the probe housing (1) comprises a connecting housing (11) and a lower housing (12), the connecting housing (11) is connected to the lower housing (12), the magnetic detection sensor (3) is connected to the lower housing (12), and the lens (8) is connected to the connecting housing (11); The movement direction of the detection probe during the detection process is taken as a first direction, and the direction perpendicular to the surface to be detected and pointing to the surface to be detected is taken as a second direction. The magnetic detection sensor (3) and the lens (8) are located in a detection plane determined by the first direction and the second direction. The lower shell is wedge-shaped, and the lower shell has an appearance with a gradually decreasing cross-sectional area along the second direction. The lower shell is arranged along the first direction.

2. The detection probe according to claim 1, characterized in that: The connecting housing (11) comprises a signal amplifier module (4), The signal amplification module (4) is fixed inside the connection housing (11).

3. The detection probe according to claim 2, characterized in that: The connecting housing (11) comprises a probe gland (6), The probe gland (6) and the connecting shell (11) are fixed to each other.

4. The detection probe according to claim 3, characterized in that: The connecting housing (11) further comprises an aviation plug (5). The aviation plug (5) is vertically connected to the probe gland (6) along the second direction.

5. The detection probe according to claim 1, characterized in that: The connecting housing (11) comprises a connecting housing groove (111), The connection housing groove (111) is located in the detection plane determined by the first direction and the second direction, and is placed on one side of the exterior of the connection housing (11).

6. The detection probe according to claim 5, characterized in that: The connecting housing groove (111) includes the lens (8), The lens (8) is arranged in the connecting housing groove (111).

7. The detection probe according to claim 5, characterized in that: The connecting housing groove (111) further includes a SMD LED (114). The SMD LED (114) is arranged in the connection housing groove (111).

8. The detection probe according to claim 1, characterized in that: The connecting housing (11) comprises a connecting housing slot (112), The connection housing slot (112) is disposed on one side of the exterior of the connection housing (11).

9. The detection probe according to claim 8, characterized in that: The connecting housing slot (112) further comprises a lens circuit board (113), The lens circuit board (113) is arranged in the connecting housing slot (112).

10. The detection probe according to claim 1, characterized in that: The lower shell (12) is connected to the connecting shell (11) via a plane with the largest wedge-shaped cross-sectional area.

11. The detection probe according to claim 10, characterized in that: The lower shell (12) comprises a probe detection groove (121) and a probe excitation groove (122). The probe detection groove (121) and the probe excitation groove (122) are located in the connection shell (11), and the probe excitation groove (122) is located inside the lower shell (12) compared to the probe detection groove (121).

12. The detection probe according to claim 11, characterized in that: The probe detection groove (121) includes the magnetic detection sensor (3), The magnetic detection sensor (3) is arranged in the probe detection groove (121).

13. The detection probe according to claim 11, characterized in that: The probe excitation groove (122) comprises a magnetic core (2), The magnetic core (2) is arranged in the probe excitation groove (122).

14. A visual electromagnetic composite defect detection method, characterized in that: include: S1: Continuously collecting the video of the welding seam, the Bx channel signal and the Bz channel signal of the test piece through the lens (8) and the magnetic detection sensor (3); S2: performing noise reduction processing on the Bx channel signal and the Bz channel signal, and drawing a signal curve; S3: judging whether it is a defect signal according to the signal curve and the video of the welding seam; S4: Send out defect information.

15. The method according to claim 14, characterized in that: The step S3 includes: A threshold signal is set. If the Bz channel signal in the signal curve is greater than the threshold signal, the Bz channel signal is re-collected three times to obtain a verification Bz channel signal. If the verification Bz channel signal is consistent with the Bz channel signal in the signal curve, it is determined to be the defect signal.

16. The method according to claim 15, characterized in that: The step S3 further includes: If the Bz channel signal in the signal curve is less than the threshold signal and / or the verification Bz channel signal is inconsistent, the Bx channel signal in the signal curve is judged. If it is greater than the threshold signal, the surface undulation of the test piece is judged through the video at the welding seam. If the surface undulation of the test piece is less than or equal to 1 mm, it is determined to be the defect signal; If the surface undulation of the test piece is greater than 1mm, determine whether it is a non-correlated display. If so, it is determined to be qualified. If it is not a non-correlated display, re-collect the Bx channel signal three times to obtain a verification Bx channel signal. If the verification Bx channel signal is consistent with the Bx channel signal in the signal curve, it is determined to be the defect signal.

17. The method according to claim 16, characterized in that: The non-related display includes: The non-correlated displays include checking for operating errors, checking for equipment noise, checking for material properties, and checking for surface conditions.

18. The method according to claim 14, characterized in that: The step S4 includes: The defect information includes the defect signal and the corresponding key frame of the video at the welding seam.

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