Inclined excitation double-array probe for nuclear power station neutron flux tube defect detection

Abstract

The utility model discloses an inclined excitation double-array probe for detecting the defect of a neutron flux tube in a nuclear power station. A first inclined excitation array and a second inclined excitation array of the inclined excitation double-array probe are inclined along the axial direction of a framework and are arranged in a relatively rotating manner; the relatively insensitive direction of one inclined excitation array is detected and complemented by the sensitive direction of the other inclined excitation array, and meanwhile, the signals of the two inclined excitation arrays can be mutually verified. Therefore, the inclined excitation double-array probe can detect defects in all directions of the nuclear power station neutron-flux tube in one-time nuclear power station neutron-flux tube scanning, has higher reliability, remarkably improves the eddy current detection process, improves the qualitative and quantitative level of abrasion of the nuclear power station neutron-flux tube, and improves the detection accuracy of the nuclear power station neutron-flux tube. The device is of great significance to maintenance of the nuclear power station neutron flux tube, some unnecessary tube cutting displacement or tube sealing and blocking can be effectively avoided, and the service life of the nuclear power station neutron flux tube is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to an inclined excitation double-array probe for detecting defects in neutron flux tubes of nuclear power plants. Background Art

[0002] To promptly detect abnormalities and ensure the safe operation of nuclear reactors, nuclear power plants use neutron flux sensors to monitor the neutron flux in the reactor core in real time. By monitoring the neutron flux, operators can adjust the position of control rods or change the coolant flow rate to maintain the reactor's power level. Neutron flux tubes are critical components placed in the core, providing a measurement channel for the core neutron flux detector. They are named "finger tubes" because of their finger-like shape. During unit operation, the finger tubes are subjected to long-term impact from the water flow, causing sudden changes in the cross-section of the guide channel, which can easily lead to micro-vibration wear. This can affect the stable operation of the unit and require inspection during overhaul. To prevent excessive wear defects from causing perforation of the finger tubes and resulting in reactor coolant leaks, it is crucial to detect the depth of the wear defects. Currently, there is relatively little research on defect detection in finger sleeves. The most commonly used detection probe for in-service inspections is the internal eddy current test, and amplitude analysis is usually used to evaluate its wear depth. Because internal eddy current testing uses a bobbin probe, there is only one signal at the same axial position, making it difficult for inspectors to parse information related to the defect shape, and even more difficult to conduct quantitative research on the defect depth. Due to the significant morphological differences between actual wear defects and artificial defects, and the circumferential width, axial length, and shape of the wear all affect the extraction of depth information from the defect signal, the use of amplitude analysis to evaluate the bobbin probe signal is prone to large measurement depth deviations, which can lead to unnecessary pipe cutting, displacement, or pipe sealing, shortening the service life of the finger sleeve. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an inclined excitation dual array probe for detecting defects in neutron flux tubes of nuclear power plants.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: constructing an inclined excitation dual-array probe for neutron flux tube defect detection in a nuclear power plant, comprising a frame, and a first inclined excitation array and a second inclined excitation array arranged on the frame, wherein the frame is columnar, the first inclined excitation array and the second inclined excitation array are arranged at an angle of 45° along the axial direction of the frame, and the first inclined excitation array and the second inclined excitation array are arranged relative to each other by 180° along the axial direction of the frame;

[0005] The first tilted excitation array includes a first circuit board and a plurality of first tunnel magnetoresistive sensors arranged on the first circuit board, and the first tilted excitation array also includes a first excitation coil wound around the frame;

[0006] The second tilted excitation array includes a second circuit board and a plurality of second tunnel magnetoresistive sensors arranged on the second circuit board. The second tilted excitation array also includes a second excitation coil wound around the skeleton. The number of the second tunnel magnetoresistive sensors is the same as the number of the first tunnel magnetoresistive sensors.

[0007] In some embodiments, the skeleton is a resin skeleton, and the skeleton has a hollow structure.

[0008] In some embodiments, a portion of the skeleton located between the first tilted excitation array and the second tilted excitation array is provided with groove patterns on its periphery.

[0009] In some embodiments, the groove pattern is a mesh pattern.

[0010] In some embodiments, the first circuit board and the second circuit board are both flexible printed circuit boards;

[0011] The first circuit board and the second circuit board are attached to or embedded in the frame.

[0012] In some embodiments, epoxy resin glue is applied on the peripheries of the first circuit board and the second circuit board.

[0013] In some embodiments, the first excitation coil and the second excitation coil both have 30 turns.

[0014] In some embodiments, the first excitation coil includes a first sub-excitation coil and a second sub-excitation coil that are connected to each other, and the first sub-excitation coil and the second sub-excitation coil are respectively arranged on both sides of the first circuit board along the axial direction of the skeleton;

[0015] The second excitation coil includes a third sub-excitation coil and a fourth sub-excitation coil that are connected to each other. The third sub-excitation coil and the fourth sub-excitation coil are respectively arranged on both sides of the second circuit board along the axial direction of the skeleton.

[0016] In some embodiments, the number of the first tunnel magnetoresistive sensors and the number of the second tunnel magnetoresistive sensors are both eight.

[0017] In some embodiments, a plurality of first U-shaped portions are provided at the end of the first end of the skeleton, the openings of the plurality of first U-shaped portions are arranged toward the skeleton, and the plurality of first U-shaped portions are evenly spaced along the central circumference direction of the end of the first end of the skeleton;

[0018] The second end of the frame is provided with a plurality of second U-shaped portions, the openings of the plurality of second U-shaped portions are arranged toward the frame, and the plurality of second U-shaped portions are evenly spaced along the central circumference direction of the second end of the frame.

[0019] The implementation of the utility model has the following beneficial effects: the first tilted excitation array and the second tilted excitation array of the tilted excitation dual array probe for detecting defects in nuclear power plant neutron flux tubes are tilted along the axial direction of the skeleton and are relatively rotated, and the relatively insensitive direction of one tilted excitation array is complemented by the sensitive direction detection of the other tilted excitation array, and the signals of the two tilted excitation arrays can also verify each other. Therefore, the tilted excitation dual array probe for detecting defects in nuclear power plant neutron flux tubes can detect defects in all directions of nuclear power plant neutron flux tubes in a single nuclear power plant neutron flux tube scan, has higher reliability, significantly improves the eddy current detection process, and improves the qualitative and quantitative level of nuclear power plant neutron flux tube wear. It is of great significance to the maintenance of nuclear power plant neutron flux tubes, and also fills the gap in eddy current detection of domestic nuclear power plant neutron flux tube arrays. It can effectively avoid some unnecessary cutting and displacement of pipes or sealing and blocking of pipes, ensuring the service life of nuclear power plant neutron flux tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0021] Figure 1 This is one of the structural schematic diagrams of an inclined excitation dual array probe for neutron flux tube defect detection in a nuclear power plant in some embodiments of the present invention;

[0022] Figure 2 This is the second structural schematic diagram of the tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants in some embodiments of the present invention;

[0023] Figure 3 This is the third structural schematic diagram of the tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants in some embodiments of the present invention;

[0024] Figure 4 Schematic diagram of the structure of an inclined excitation dual array probe for neutron flux tube defect detection in a nuclear power plant in other embodiments of the present invention;

[0025] Figure 5This is a schematic diagram of circuits on the first circuit board and the second circuit board in some embodiments of the present invention. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0027] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be internal connections between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only used to facilitate the description of the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and "third" can explicitly or implicitly include one or more of these features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0029] See also Figures 1 to 3The present invention shows an inclined excitation dual array probe for detecting neutron flux tube defects in nuclear power plants, including a skeleton 10, and a first inclined excitation array 20 and a second inclined excitation array 30 arranged on the skeleton 10. The skeleton 10 is roughly columnar, for example, the skeleton 10 can be roughly cylindrical, and the skeleton 10 serves as the supporting structure of the entire inclined excitation dual array probe for detecting neutron flux tube defects in nuclear power plants. The skeleton 10 is a resin skeleton, for example, it can be a resin skeleton printed using 3D printing technology, and the skeleton 10 can be roughly white cylindrical. In some embodiments, the entire skeleton 10 can be replaced by a metal material with lower magnetic permeability to obtain higher structural strength. The metal material includes but is not limited to titanium metal. The skeleton 10 is a hollow structure, and the two ends of the skeleton 10 can be axially through-set, so that the structure of the skeleton 10 itself has a certain flexibility, and the hollow inner cavity of the skeleton 10 can be used for cable routing of the first inclined excitation array 20 and the second inclined excitation array 30. As Figure 4 As shown, in other embodiments, the outer periphery of the portion of the skeleton 10 located between the first tilted excitation array 20 and the second tilted excitation array 30 is provided with grooves 11. Preferably, the grooves 11 are mesh-like. It is understood that the flexible bending structure in the middle portion of the skeleton 10 is made of an annular material with elongated threads cut out, which facilitates bending while providing a certain degree of strength to protect the components (such as cables) within the inner cavity of the skeleton 10.

[0030] like Figure 3 As shown, the first tilted excitation array 20 and the second tilted excitation array 30 are arranged at an angle of 45° along the axial direction of the skeleton 10, and the first tilted excitation array 20 and the second tilted excitation array 30 are arranged to be rotated 180° relative to the axial direction of the skeleton 10. It can be understood that in order to detect defects in all directions of the neutron flux tube (referring to the sleeve) of the nuclear power plant and avoid missed detection, the tilted first tilted excitation array 20 and the second tilted excitation array 30 are used. The first tilted excitation array 20 and the second tilted excitation array 30 are rotated 45° along the axial direction and arranged at 180° relative to each other. The direction in which the first tilted excitation array 20 (or the second tilted excitation array 30) has a weaker sensitivity can be compensated by the second tilted excitation array 30 (or the first tilted excitation array 20) detecting a more sensitive direction detection signal. The signals of the first tilted excitation array 20 and the second tilted excitation array 30 can verify each other, thereby enhancing the reliability and stability of the tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants.

[0031] The first tilted excitation array 20 includes a first circuit board 21 and a plurality of first tunnel magnetoresistive sensors (not shown) provided on the first circuit board 21. The first tilted excitation array 20 also includes a first excitation coil 22 wound around the skeleton 10. The tunnel magnetoresistive sensor is a TMR sensor (Tunnel Magneto Resistance). The first tunnel magnetoresistive sensor is used to convert the resistance change caused by the change of the external magnetic field into a voltage signal. It can be understood that electromagnetic detection has the advantages of non-contact, high sensitivity, and fast detection speed. Due to the small size of the tunnel magnetoresistive sensor, more sensors can be integrated in a limited space, and the adjacent distance can be as small as 0.5 mm, so it has a higher spatial resolution. At the same time, the tunnel magnetoresistive sensor has the advantages of high sensitivity and small mutual inductance.

[0032] Similarly, the second tilted excitation array 30 includes a second circuit board 31 and a plurality of second tunnel magnetoresistive sensors (not shown) provided on the second circuit board 31. The second tilted excitation array 30 also includes a second excitation coil 32 wound around the skeleton 10. The tunnel magnetoresistive sensor is a TMR sensor (Tunnel Magneto Resistance). The second tunnel magnetoresistive sensor is used to convert the resistance change caused by the change in the external magnetic field into a voltage signal. It can be understood that electromagnetic detection has the advantages of non-contact, high sensitivity, and fast detection speed. Due to the small size of the tunnel magnetoresistive sensor, more sensors can be integrated in a limited space, and the distance between adjacent sensors can be as small as 0.5 mm, so it has a higher spatial resolution. At the same time, the tunnel magnetoresistive sensor has the advantages of high sensitivity and low mutual inductance. Furthermore, the number of the second tunnel magnetoresistive sensors is the same as the number of the first tunnel magnetoresistive sensors. In some embodiments, the number of the first tunnel magnetoresistive sensors and the second tunnel magnetoresistive sensors is eight. Of course, the number of the first tunnel magnetoresistive sensors and the second tunnel magnetoresistive sensors can be selected and set according to actual needs and is not specifically limited here.

[0033] In some embodiments, the first circuit board 21 and the second circuit board 31 are arranged at a 45° tilt along the axial direction of the frame 10, and the first circuit board 21 and the second circuit board 31 are arranged 180° rotated relative to each other along the axial direction of the frame 10. The first circuit board 21 and the second circuit board 31 are both flexible printed circuit boards. The first circuit board 21 and the second circuit board 31 are attached to or embedded in the frame 10. The frame 10 may be provided with a plurality of through holes to facilitate the cables of the first circuit board 21 and the second circuit board 31 to enter the inner cavity of the frame 10 through the through holes.

[0034] In some embodiments, epoxy resin glue 40 is provided on the periphery of the first circuit board 21 and the second circuit board 31 to partially protect the structures of the first circuit board 21 and the second circuit board 31.

[0035] Of course, in other embodiments, when the first circuit board 21 and the second circuit board 31 have good structural packaging and protection, the epoxy resin glue 40 may not be provided.

[0036] In some embodiments, the first excitation coil 22 and the second excitation coil 32 are arranged at a 45° angle along the axial direction of the frame 10, and the first excitation coil 22 and the second excitation coil 32 are arranged 180° relative to each other along the axial direction of the frame 10. The first excitation coil 22 and the second excitation coil 32 can be connected to an external signal generator. The number of turns of the first excitation coil 22 and the second excitation coil 32 is 30. Of course, the number of turns of the first excitation coil 22 and the second excitation coil 32 can be adjusted according to actual needs and is not specifically limited here.

[0037] In some embodiments, the first excitation coil 22 includes a first sub-excitation coil 221 and a second sub-excitation coil 222 connected to each other. The first sub-excitation coil 221 and the second sub-excitation coil 222 are respectively arranged on both sides of the first circuit board 21 along the axial direction of the skeleton 10.

[0038] Similarly, the second excitation coil 32 includes a third sub-excitation coil 321 and a fourth sub-excitation coil 322 connected to each other. The third sub-excitation coil 321 and the fourth sub-excitation coil 322 are respectively arranged on both sides of the second circuit board 31 along the axial direction of the skeleton 10 .

[0039] like Figures 1 to 4 As shown, in some embodiments, the first end of the skeleton 10 is provided with a plurality of first U-shaped portions 50. The openings of the plurality of first U-shaped portions 50 are disposed toward the skeleton 10, and the plurality of first U-shaped portions 50 are evenly spaced along the central circumference of the first end of the skeleton 10, forming a generally petal-like structure. One end of each first U-shaped portion 50 is connected to the first end of the skeleton 10, while the other end of the first U-shaped portion 50 is suspended, i.e., a certain distance is provided between the other end of the first U-shaped portion 50 and the first end of the skeleton 10. Preferably, there are six first U-shaped portions 50.

[0040] Similarly, the end of the second end of the skeleton 10 is provided with a plurality of second U-shaped portions 60, the openings of the plurality of second U-shaped portions 60 are arranged toward the skeleton 10, and the plurality of second U-shaped portions 60 are evenly spaced along the central circumferential direction of the end of the second end of the skeleton 10, roughly forming a petal-shaped structure. One end of the second U-shaped portion 60 is connected to the end of the second end of the skeleton 10, and the other end of the second U-shaped portion 60 is suspended, that is, there is a certain distance between the other end of the second U-shaped portion 60 and the end of the second end of the skeleton 10. Preferably, the number of the second U-shaped portions 60 can be six. The number of the first U-shaped portion 50 and the second U-shaped portion 60 can be selected and set according to actual needs, and is not specifically limited here.

[0041] It can be understood that the first U-shaped portion 50 and the second U-shaped portion 60 are respectively provided at both ends of the skeleton 10, which can fix the lifting distance of the inclined excitation dual-array probe used for neutron flux tube defect detection in nuclear power plants, thereby reducing the impact of the tilted excitation dual-array probe used for neutron flux tube defect detection in nuclear power plants on the detection signal due to shaking in the pipeline of the neutron flux tube of the nuclear power plant.

[0042] like Figure 5 As shown, in some embodiments, the first circuit board 21 and the second circuit board 31 are provided with processing circuits. The processing circuits are identical. Taking the processing circuit on the first circuit board 21 as an example, the processing circuit includes a multiplexer D1, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a capacitor C1. The multiplexer D1 is connected to a plurality of first tunnel magnetoresistive sensors. When there are eight tunnel magnetoresistive sensors, the multiplexer D1 can be an 8-to-1 multiplexer, such as the MAX4508ESE+. Of course, other multiplexer models can also be selected based on actual needs, and this is not specifically limited here.

[0043] The output end (D end) of the multiplexer D1 is connected to the non-inverting input end of the first operational amplifier U1. One end of the first resistor R1 is connected to the input voltage, and the other end of the first resistor R1 is connected to the non-inverting input end of the first operational amplifier U1. One end of the second resistor R2 is connected to the input voltage, and the other end of the second resistor R2 is connected to the inverting input end of the first operational amplifier U1. One end of the third resistor R3 is connected to the inverting input end of the first operational amplifier U1, and the other end of the third resistor R3 is connected to the output end of the first operational amplifier U1. The resistance value of the first resistor R1, the second resistor R2, and the third resistor R3 is 8.66 kΩ. The first operational amplifier U1 can be used for signal bias voltage adjustment.

[0044] Furthermore, the output end of the first operational amplifier U1 is connected to the non-inverting input end of the second operational amplifier U2. Furthermore, the capacitor C1 is connected to the output end of the first operational amplifier U1 and the non-inverting input end of the second operational amplifier U2. The value of the capacitor C1 can be 1uF.

[0045] Furthermore, one end of the fourth resistor R4 is connected to the non-inverting input terminal of the second operational amplifier U2, and the other end of the fourth resistor R4 is grounded. The resistance value of the fourth resistor R4 is 1kΩ. The fourth resistor R4 and the capacitor C1 jointly implement a high-pass filtering function. One end of the fifth resistor R5 is connected to the inverting input terminal of the second operational amplifier U2, and the other end of the fifth resistor R5 is grounded. The resistance value of the fifth resistor R5 is 1kΩ. One end of the sixth resistor R6 is connected to the output terminal of the second operational amplifier U2, and the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5. The resistance value of the sixth resistor R6 is 100kΩ. The output terminal of the second operational amplifier U2 can be connected to an eddy current meter to transmit the detection signal to the eddy current meter.

[0046] The second operational amplifier U2 can play a role in signal amplification. Furthermore, the first operational amplifier U1 and the second operational amplifier U2 can both use the model LM258. Of course, other operational amplifiers can also be selected according to actual needs. No specific limitation is made here. It is understandable that technicians can follow Figure 5 As for the processing circuit implemented in this application, of course, technicians can also make appropriate adjustments based on actual needs, and no specific limitations are made here.

[0047] The first tilted excitation array 20 and the second tilted excitation array 30 of the tilted excitation dual array probe for detecting defects in neutron flux tubes in nuclear power plants are tilted 45° along the axis of the skeleton 10 and rotated 180° relative to each other. The relatively insensitive direction of one tilted excitation array is complemented by the sensitive direction detection of the other tilted excitation array. At the same time, the signals of the two tilted excitation arrays can also verify each other. Therefore, the tilted excitation dual array probe for detecting defects in neutron flux tubes in nuclear power plants can detect defects in all directions of neutron flux tubes in a single scan of the neutron flux tubes in a nuclear power plant. It has higher reliability, significantly improves the eddy current detection process, and improves the qualitative and quantitative level of wear of neutron flux tubes in nuclear power plants. It is of great significance to the maintenance of neutron flux tubes in nuclear power plants, and also fills the gap in eddy current detection of neutron flux tube arrays in domestic nuclear power plants.

[0048] In addition, compared with existing detection methods (bobbin probe detection), the tilted excitation dual-array probe used for nuclear power plant neutron flux tube defect detection can perform detection more effectively and can more intuitively display the shape and size of defects on the outside of the finger sleeve, making it easier for maintenance personnel to accurately locate defects in different positions and different defects at the same scanning position, and more accurately assess whether the tube needs to be cut, shifted, or sealed or blocked. This can effectively avoid some unnecessary cutting, shifting, or sealing and blocking, ensuring the service life of the nuclear power plant neutron flux tube (finger sleeve).

[0049] It can be understood that the tilted excitation dual-array probe used for nuclear power plant neutron flux tube defect detection is based on the basic principle of electromagnetic detection. It uses a tunnel magnetoresistive sensor to convert the magnetic field signal into an electrical signal and performs array scanning imaging, which helps to qualitatively and quantitatively analyze the various parameters of the nuclear power plant neutron flux tube (referring to the casing) defects.

[0050] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants, characterized in that: The invention comprises a frame (10), and a first tilted excitation array (20) and a second tilted excitation array (30) arranged on the frame (10), wherein the frame (10) is columnar, the first tilted excitation array (20) and the second tilted excitation array (30) are arranged at an angle of 45° along the axial direction of the frame (10), and the first tilted excitation array (20) and the second tilted excitation array (30) are arranged to be rotated 180° relative to the axial direction of the frame (10); The first tilted excitation array (20) comprises a first circuit board (21) and a plurality of first tunnel magnetoresistive sensors arranged on the first circuit board (21); the first tilted excitation array (20) further comprises a first excitation coil (22) wound around the frame (10); The second tilted excitation array (30) comprises a second circuit board (31) and a plurality of second tunnel magnetoresistive sensors arranged on the second circuit board (31); the second tilted excitation array (30) further comprises a second excitation coil (32) wound around the skeleton (10); the number of the second tunnel magnetoresistive sensors is the same as the number of the first tunnel magnetoresistive sensors.

2. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The skeleton (10) is a resin skeleton, and the skeleton (10) is a hollow structure.

3. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The outer periphery of the portion of the skeleton (10) located between the first tilted excitation array (20) and the second tilted excitation array (30) is provided with groove patterns (11).

4. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 3, characterized in that: The groove pattern (11) is a mesh pattern.

5. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The first circuit board (21) and the second circuit board (31) are both flexible printed circuit boards; The first circuit board (21) and the second circuit board (31) are attached to or embedded in the frame (10).

6. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: Epoxy resin glue (40) is provided on the peripheries of the first circuit board (21) and the second circuit board (31).

7. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The number of turns of the first excitation coil (22) and the second excitation coil (32) are both 30 turns.

8. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The first excitation coil (22) comprises a first sub-excitation coil (221) and a second sub-excitation coil (222) connected to each other, and the first sub-excitation coil (221) and the second sub-excitation coil (222) are respectively arranged on both sides of the first circuit board (21) along the axial direction of the skeleton (10); The second excitation coil (32) comprises a third sub-excitation coil (321) and a fourth sub-excitation coil (322) connected to each other, and the third sub-excitation coil (321) and the fourth sub-excitation coil (322) are respectively arranged on both sides of the second circuit board (31) along the axial direction of the skeleton (10).

9. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The number of the first tunnel magnetoresistive sensors and the number of the second tunnel magnetoresistive sensors are both eight.

10. The tilted excitation dual array probe for neutron flux tube defect detection in nuclear power plants according to claim 1, characterized in that: The end portion of the first end of the skeleton (10) is provided with a plurality of first U-shaped portions (50), the openings of the plurality of first U-shaped portions (50) are arranged toward the skeleton (10), and the plurality of first U-shaped portions (50) are evenly spaced along the central circumferential direction of the end portion of the first end of the skeleton (10); The end portion of the second end of the skeleton (10) is provided with a plurality of second U-shaped portions (60), the openings of the plurality of second U-shaped portions (60) are arranged toward the skeleton (10), and the plurality of second U-shaped portions (60) are evenly spaced along the central circumferential direction of the end portion of the second end of the skeleton (10).

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