Magnetostrictive ultrasonic guided-wave detection sensor for pipeline with slender thin-wall structure

Abstract

The invention discloses a magnetostrictive ultrasonic guided-wave detection sensor for a long and thin-wall structure pipeline, and belongs to the technical field of ultrasonic guided-wave sensors.The magnetostrictive ultrasonic guided-wave detection sensor for the long and thin-wall structure pipeline comprises an aluminum shell for protecting a magnetization unit, and the section of the aluminum shell is of a U-shaped structure; a magnetizing assembly is embedded in the aluminum shell, a magnetic conductive sheet is fixed on the magnetizing assembly, the lower surface of the magnetic conductive sheet and the lower surface of the aluminum shell are located on the same plane, and the width of the magnetic conductive sheet and the width of the magnetizing assembly are the same as the inner width of the aluminum shell; an aluminum shell conforming to the magnetization unit is clamped and sleeved outside the aluminum shell; a connecting and positioning component which is connected with the plurality of groups of magnetizing units and assists the plurality of magnetizing units to be annularly adsorbed outside the pipeline is arranged outside the aluminum shell; according to the detection requirement of the thin and long thin-wall pipeline, a corresponding number of magnetization units can be reasonably installed outside the pipeline, the magnetic intensity of the magnetization units can be controlled, and the detection accuracy is high.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic guided wave sensors, in particular to a magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipeline. Background Art

[0002] The magnetostrictive effect is a coupling phenomenon involving magnetization engineering and the change of size or shape of ferromagnetic materials. When the ferromagnetic material is subjected to an alternating external magnetic field, the randomly oriented magnetic domains inside it turn to the direction of the external magnetic field, causing its macroscopic size and shape to change. This phenomenon is called the positive magnetostrictive effect. Generally, a permanent magnetic circuit is used to perform unidirectional static bias magnetization on the magnetostrictive strip. From the Wiedemann effect, it can be seen that the magnetostrictive strip will produce high-frequency shear deformation under the action of orthogonal dynamic and static magnetic fields, and a modal guided wave will be formed during the propagation along the pipeline.

[0003] For example, the patent with publication number CN102608207B discloses a magnetostrictive guided wave sensor, which is to fix two permanent magnets with opposite polarities at the lower ends of both sides of a supporting bracket. After the rotating bracket passes through the central hole of the supporting bracket, it is positioned in the central hole of the heat-resistant insulating layer inlaid with an excitation coil. The rotating bracket can drive the supporting bracket to rotate, and the Fe-CO-V disk is attached to the lower surface of the heat-resistant insulating layer. The heat-resistant insulating layer is located between the two permanent magnets with opposite polarities. Based on the action mechanism of magnetic-mechanical-thermal multi-field coupling, through theoretical analysis and experimental research on the comprehensive quantitative characteristic model of ultrasonic guided wave echoes, a ultrasonic guided wave sound field control theory and method with comprehensive optimization performance such as information carrying integrity and sensitivity to various defects is formed, and phased array technology and wavelet transform technology are used as strategies to realize real-time quantitative magnetostrictive ultrasonic guided wave metal pipeline defect non-destructive detection, which can be applied to online high-temperature metal pipeline detection.

[0004] For another example, the patent with publication number CN214794601U discloses a pipeline magnetostrictive waveguide sensor, which includes two groups of sensor components that can be connected to form a ring, each group of sensor components is provided with a semi-ring skeleton, and the semi-ring skeleton is provided with magnet assembly grooves with the same spacing along the circumferential direction. Each magnet in the permanent magnet array is correspondingly arranged in the magnet assembly groove, so that the spacing between two adjacent groups of magnets is the same, so that the static magnetic field generated by the sensor is evenly distributed along the circumference; a plurality of iron-cobalt alloy belt slots are respectively arranged at intervals at the bottom of the inner side of the arc-shaped strips of the semi-ring skeleton, and the spacing between adjacent iron-cobalt alloy belt slots along the circumferential direction is the same, and an excitation coil wound on the iron-cobalt alloy belt is provided at the gap position between the adjacent iron-cobalt alloy belt slots, so that the coil on the iron-cobalt alloy belt is evenly wound, so that the dynamic magnetic field is evenly distributed, which can ensure the stability of the generated ultrasonic guided waves.

[0005] Another example is the patent with publication number CN104874538A which discloses a bending mode magnetostrictive sensor, including a cylindrical shell of ferromagnetic material, a flexible printed coil, and a permanent magnetic circuit; wherein the cylindrical shell of ferromagnetic material is sleeved on the outside of a micro-circular tube and bonded to the surface of the micro-circular tube with epoxy resin, and the permanent magnetic circuit provides a specific magnetic field to magnetize the cylindrical shell of ferromagnetic material, thereby forming a static magnetic field distribution that is conducive to the excitation of the bending mode; an AC signal is introduced into the flexible printed coil to generate a dynamic magnetic field, and the cross-sectional displacement distribution of the cylindrical shell of ferromagnetic material will conform to the cross-sectional vibration form of the bending mode, and finally a bending mode ultrasonic guided wave is formed in the micro-circular tube; by adjusting the installation method of the permanent magnet in the permanent magnetic circuit, the sensor can excite bending mode ultrasonic guided waves of different orders; however, the existing part is installed in a slender thin-walled pipe. The ultrasonic guided wave sensor used for detection is not convenient to be flexibly disassembled and assembled according to the diameter of the pipeline. The ultrasonic guided wave sensor is distributed in a ring outside the pipeline. Adjacent magnetized units are easily adsorbed by surrounding magnetized units during use, affecting use. In addition, the magnetostrictive effect is a phenomenon in which ferromagnetic materials undergo mechanical deformation under the action of an external magnetic field. Its intensity is closely related to the magnetization state of the material. If there are too many magnets, the magnetic field distribution inside the material may be uneven, thereby reducing the efficiency of the magnetostrictive effect and affecting the sensitivity and detection accuracy of the sensor. If the number of magnets is too small, the magnetic field strength may be insufficient, and the deformation of the magnetostrictive material cannot be effectively stimulated, resulting in the sensor being unable to work properly. Some existing ultrasonic guided wave sensors cannot adjust the number of magnets according to detection needs, affecting the actual detection effect.

[0006] In view of the above problems, it is urgent to carry out innovative designs based on the original ultrasonic guided wave sensors. Summary of the invention

[0007] The object of the present invention is to provide a magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe structure, so as to solve the problem proposed in the above background technology that some of the existing ultrasonic guided wave sensors installed on slender thin-walled pipes for detection are not convenient to flexibly disassemble and assemble according to the diameter of the pipe, the ultrasonic guided wave sensors are distributed in a ring outside the pipe, and adjacent magnetized units are easily adsorbed by the surrounding magnetized units during use, affecting the use.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a slender thin-walled structure pipeline magnetostrictive ultrasonic guided wave detection sensor, comprising an aluminum shell protecting a magnetization unit, the aluminum shell having a U-shaped cross-section, a magnetization component embedded and installed inside the aluminum shell, a magnetic conductive sheet fixed on the magnetization component, the lower surface of the magnetic conductive sheet and the lower surface of the aluminum shell are in the same plane, the width of the magnetic conductive sheet and the magnetization component is the same as the inner width of the aluminum shell; the outer snap-fit ​​sleeve of the aluminum shell is equipped with an aluminum shell that conforms to the magnetization unit, the aluminum shell shield protects the outside of the magnetization component, and the aluminum shell has a U-shaped cross-section; the outside of the aluminum shell is provided with a connecting and positioning component that connects multiple groups of magnetization units and assists the multiple magnetization units to be annularly adsorbed on the outside of the pipeline.

[0009] Preferably, the magnetization assembly includes four NdFeB magnets, which are fixedly mounted inside the aluminum housing. The four NdFeB magnets are stacked and fitted in pairs, and the lower ends of the two lower NdFeB magnets are fixedly connected to the magnetic conductive sheet.

[0010] Preferably, the magnetization assembly includes two NdFeB magnets and two aluminum frames, the two aluminum frames are fixed to the top surface of the aluminum shell, the NdFeB magnets are fixed to the lower end of the aluminum frame, and the lower ends of the two NdFeB magnets are fixedly connected to the magnetic conductive sheet; the volume of the NdFeB magnets is the same as the volume of the aluminum frame.

[0011] Preferably, the connecting and positioning component includes an aluminum triangular connecting seat symmetrically fixed on both sides of the aluminum shell, and an external threaded column is fixedly connected to the middle position of the inner bottom surface of the aluminum triangular connecting seat; a connecting belt is connected through the aluminum triangular connecting seat, and a plurality of positioning circular holes are opened on the connecting belt at equal intervals.

[0012] Preferably, the connecting belt is sleeved on the outside of the external threaded column through a positioning circular hole, the connecting belt is connected to the aluminum triangular connecting seat of multiple groups of magnetized units, and the bottom surface of the connecting belt fits with the inner bottom surface of the aluminum triangular connecting seat.

[0013] Preferably, a plurality of grooves are formed on the connecting belt at equal intervals, and the grooves are arranged in the middle of two adjacent positioning circular holes; the connecting belt is made of an elastic bendable material, and the connecting belt is bent and wrapped around the FPC soft flat cable outside the pipe through the grooves.

[0014] Preferably, the aluminum triangular connecting seat is provided with a reinforcing member for limiting the assembly position of the connecting belt.

[0015] Preferably, the reinforcing member comprises a hollow column fixed on an aluminum triangular connecting seat, and a through groove is provided on the upper inclined surface of the aluminum triangular connecting seat; a fixing pile is connected through the hollow column, and an internal thread groove is provided on the lower end of the fixing pile.

[0016] Preferably, the through groove, the hollow column and the external thread column are positioned corresponding to each other, and the fixing pile passes through the hollow column and the through groove; the fixing pile is threadedly connected to the external thread column through the internal thread groove.

[0017] Preferably, a gasket is provided between the connecting belt and the fixing pile, the gasket is provided with a through hole, and the gasket is sleeved on the outside of the external threaded column through the through hole; the cross-sectional area of ​​the gasket is larger than the bottom area of ​​the fixing pile.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the magnetostrictive ultrasonic guided wave detection sensor for slender thin-walled pipes can autonomously combine magnetization units according to the outer diameter size of the slender pipes, and can control the number of magnetization units according to magnetization needs, and is flexible in disassembly and assembly.

[0019] Furthermore, according to the needs of the magnetization state, the number of NdFeB magnets installed in the aluminum housing can be selectively controlled. When the magnetic demand is high, four NdFeB magnets are installed in the aluminum housing, and the two lower NdFeB magnets are installed with magnetic conductive sheets, so that the magnetization unit generates stronger magnetism.

[0020] When the magnetic requirements are not high, two aluminum frames and two NdFeB magnets are installed in the aluminum shell. The NdFeB magnets are installed below the aluminum shell, and a magnetic conductive sheet is installed below the two NdFeB magnets. The magnetism generated by the magnetization unit is reduced. A corresponding number of NdFeB magnets are reasonably installed in the magnetization unit according to usage needs.

[0021] Furthermore, a connecting and positioning component is provided on the outside of the aluminum shell for connecting multiple groups of magnetized units and assisting the multiple magnetized units to be annularly adsorbed on the outside of the pipe. The connecting belt in the connecting and positioning component runs through the aluminum triangular connecting seats of the multiple magnetized units. According to the size of the diameter of the outer wall of the pipe, a corresponding number of magnetized units are selected and installed at equal angles on the outside of the pipe, which is convenient for assembly and disassembly.

[0022] The positioning circular hole on the connecting belt is sleeved on the outside of the external threaded column. The distance between two adjacent magnetized units can be limited by the connection between the connecting belt and the external threaded column, so that the magnetized unit installed outside the pipeline is not affected by the adsorption of surrounding magnetized units during use.

[0023] Furthermore, a reinforcing member for limiting the assembly position of the connecting belt is provided on the aluminum triangular connecting seat, and the fixing pile is installed through the hollow column. The fixing pile is threadedly installed on the outside of the external threaded column through the internal thread groove. The fixing pile presses the gasket down and presses it onto the surface of the connecting belt, so that the connecting belt can be quickly fixed to the aluminum triangular connecting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the connecting belt of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the aluminum shell of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the aluminum triangular connecting seat of the present invention.

[0027] Figure 4 It is a schematic diagram of the assembly structure of the aluminum shell and the aluminum housing of the present invention.

[0028] Figure 5 It is a schematic diagram of the separation structure of the aluminum shell and the aluminum outer shell of the present invention.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the aluminum housing of the present invention.

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the NdFeB magnet of the present invention.

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the magnetic conductive sheet of the present invention.

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure of the aluminum frame of the present invention.

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the fixed pile of the present invention.

[0034] Fig.11 It is a schematic diagram of the three-dimensional structure of the external thread column of the present invention.

[0035] Fig.12 It is a schematic diagram of the three-dimensional structure of the gasket of the present invention.

[0036] In the figure: 1. Aluminum shell; 2. NdFeB magnet; 3. Magnetic conductive sheet; 4. Aluminum shell; 5. Aluminum triangular connector; 6. External thread column; 7. Connecting belt; 8. Positioning round hole; 9. Hollow column; 10. Through groove; 11. Fixing pile; 12. Internal thread groove; 13. Gasket; 14. Perforation; 15. Aluminum frame; 16. Cutting groove; 17. FPC flexible cable. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1-Figure 12The present invention provides the following technical solutions: a slender thin-walled structure pipeline magnetostrictive ultrasonic guided wave detection sensor, comprising an aluminum shell 1 for protecting a magnetizing unit, the cross section of the aluminum shell 1 is a U-shaped structure, a magnetizing component is embedded and installed inside the aluminum shell 1, a magnetic conductive sheet 3 is fixed on the magnetizing component, the lower surface of the magnetic conductive sheet 3 is in the same plane as the lower surface of the aluminum shell 1, the width of the magnetic conductive sheet 3 and the magnetizing component is the same as the inner width of the aluminum shell 1; the outside of the aluminum shell 1 is covered with an aluminum shell 4 that conforms to the magnetizing unit, the aluminum shell 4 shields and protects the outside of the magnetizing component, and the cross section of the aluminum shell 4 is a U-shaped structure; the outside of the aluminum shell 1 is provided with a connecting and positioning component that connects multiple groups of magnetizing units and assists the multiple magnetizing units to be annularly adsorbed on the outside of the pipeline.

[0039] The magnetization assembly includes four NdFeB magnets 2, which are fixedly installed inside the aluminum housing 1. The four NdFeB magnets 2 are stacked and attached in pairs, and the lower ends of the two lower NdFeB magnets 2 are fixedly connected to the magnetic conductive sheet 3.

[0040] The magnetization assembly includes two NdFeB magnets 2 and two aluminum frames 15. The two aluminum frames 15 are fixed to the top surface of the aluminum shell 1. The NdFeB magnets 2 are fixed to the lower end of the aluminum frame 15, and the lower ends of the two NdFeB magnets 2 are fixedly connected to the magnetic conductive sheet 3. The volume of the NdFeB magnets 2 is the same as the volume of the aluminum frame 15.

[0041] The main body of the magnetization unit includes an aluminum shell 1, a NdFeB magnet 2, a magnetic conductive sheet 3 and an aluminum shell 4, etc. A plurality of magnetization units are evenly spaced and installed on the outside of a slender thin-walled pipe structure along the circumferential direction for detection, and the magnetic strength of the magnetization unit can be controlled and adjusted according to the detection needs of the slender thin-walled pipe structure. When the required magnetic strength is high, four NdFeB magnets 2 are installed in the aluminum shell 1, and the lower end surfaces of the two NdFeB magnets 2 in the lower part of the aluminum shell 1 are installed with magnetic conductive sheets 3. When the required magnetic strength is low, two NdFeB magnets 2 and two aluminum frames 15 are installed in the aluminum shell 1, and the two NdFeB magnets 2 are located at the lower position of the internal installation space of the aluminum shell 1, and the lower end surfaces of the two NdFeB magnets 2 are installed with magnetic conductive sheets 3. By controlling the number of NdFeB magnets 2 installed in the aluminum shell 1, the magnetic strength generated by the application of the magnetization unit can be controlled, thereby avoiding the problem of excessive or low magnetism of the sensor during detection.

[0042] Embodiment 2: Based on Embodiment 1, a connecting and positioning component is further disclosed, and its specific structure is as follows: the connecting and positioning component includes an aluminum triangular connecting seat 5 symmetrically fixed on both sides of the aluminum shell 1, and an external threaded column 6 is fixedly connected to the middle position of the inner bottom surface of the aluminum triangular connecting seat 5; a connecting belt 7 is penetrated and connected in the aluminum triangular connecting seat 5, and a plurality of positioning circular holes 8 are opened on the connecting belt 7 at equal intervals.

[0043] The connecting belt 7 is sleeved on the outside of the external threaded column 6 through the positioning circular hole 8. The connecting belt 7 is connected to the aluminum triangular connecting seat 5 of multiple groups of magnetized units, and the bottom surface of the connecting belt 7 fits with the inner bottom surface of the aluminum triangular connecting seat 5.

[0044] The connecting belt 7 is provided with a plurality of grooves 16 at equal intervals, and the grooves 16 are arranged in the middle of two adjacent positioning holes 8; the connecting belt 7 is made of elastic bendable material, and the connecting belt 7 is bent through the grooves 16 and wrapped around the FPC soft flat cable 17 outside the pipe.

[0045] A reinforcing member for limiting the assembly position of the connecting belt 7 is provided on the aluminum triangular connecting seat 5 .

[0046] The reinforcing member includes a hollow column 9 fixed on an aluminum triangular connecting seat 5, and a through groove 10 is formed on the upper inclined surface of the aluminum triangular connecting seat 5; a fixing pile 11 is penetrated and connected in the hollow column 9, and an internal thread groove 12 is formed at the lower end of the fixing pile 11.

[0047] The positions of the through groove 10 , the hollow column 9 and the external threaded column 6 correspond to each other, and the fixing pile 11 passes through the hollow column 9 and the through groove 10 ; the fixing pile 11 is threadedly connected to the external threaded column 6 through the internal thread groove 12 .

[0048] A gasket 13 is provided between the connecting belt 7 and the fixing pile 11 . The gasket 13 is provided with a through hole 14 . The gasket 13 is sleeved on the outside of the external threaded column 6 through the through hole 14 . The cross-sectional area of ​​the gasket 13 is larger than the bottom area of ​​the fixing pile 11 .

[0049] According to the outer diameter of the slender thin-walled pipe, the number of circumferentially distributed magnetized units can be controlled, and a suitable number of magnetized units can be selected to be installed on the outside of the connecting belt 7, and the connecting belt 7 is passed through the aluminum triangular connecting seat 5 on both sides of the magnetized unit. The connecting belt 7 is sleeved on the external threaded column 6 in the aluminum triangular connecting seat 5 through the positioning circular hole 8, and then the gasket 13 is sleeved on the outside of the external threaded column 6 through the perforation 14, and then the fixed pile 11 is penetrated and connected in the hollow column 9 and the through groove 10, and the fixed pile 11 is rotated downward so that the fixed pile 11 is threadedly sleeved on the outside of the external threaded column 6 through the internal thread groove 12 below, and the fixed pile 11 moves downward to push the gasket 13 to press on the surface of the connecting belt 7, so as to quickly fix the connecting belt 7 to the aluminum triangular connecting seat 5, and the aluminum triangular connecting seat 5 is stably installed on the outside of the connecting belt 7. When the magnetized unit is installed on the outside of the slender thin-walled pipe for detection, no adsorption phenomenon will occur between adjacent magnetized units.

[0050] The connecting belt 7 is provided with a variety of sizes and spacings of the positioning circular holes 8. A suitable connecting belt 7 is selected according to the use requirements. The spacing distance of the positioning circular holes 8 is related to the spacing distance of the circumferential installation of adjacent magnetized units. After the magnetized units are evenly spaced and installed on the surface of the connecting belt 7, the connecting belt 7 is arranged around the outside of the slender thin-walled pipe in the future. The intersection parts of the two ends of the connecting belt 7 are reinforced by gluing or screws, so that multiple magnetized units are installed in a closed circumference on the outside of the slender thin-walled pipe, thereby realizing the detection of the slender thin-walled pipe.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe, comprising an aluminum housing (1) for protecting a magnetization unit, characterized in that: The aluminum housing (1) has a U-shaped cross-section, a magnetizing component is embedded in the aluminum housing (1), a magnetic conductive sheet (3) is fixed on the magnetic conductive sheet, the lower surface of the magnetic conductive sheet (3) and the lower surface of the aluminum housing (1) are in the same plane, and the width of the magnetic conductive sheet (3) and the magnetizing component is the same as the inner width of the aluminum housing (1); The aluminum shell (1) is fitted with an aluminum shell (4) that matches the magnetization unit on its exterior, the aluminum shell (4) is shielded and protected on the exterior of the magnetization component, and the cross-section of the aluminum shell (4) is a U-shaped structure; The outside of the aluminum housing (1) is provided with a connection positioning component that connects multiple groups of magnetizing units and assists the multiple magnetizing units to be annularly adsorbed on the outside of the pipeline.

2. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 1, characterized in that: The magnetization assembly comprises four NdFeB magnets (2). The NdFeB magnets (2) are fixedly mounted inside the aluminum housing (1). The four NdFeB magnets (2) are stacked and bonded in pairs, and the lower ends of the two lower NdFeB magnets (2) are fixedly connected to the magnetic conductive sheet (3).

3. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 1, characterized in that: The magnetization assembly comprises two NdFeB magnets (2) and two aluminum frames (15), the two aluminum frames (15) are fixed to the inner top surface of the aluminum housing (1), the NdFeB magnets (2) are fixed to the lower ends of the aluminum frames (15), and the lower ends of the two NdFeB magnets (2) are fixedly connected to the magnetic conductive sheet (3); The volume of the NdFeB magnet (2) is the same as the volume of the aluminum frame (15).

4. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 1, characterized in that: The connection and positioning component comprises an aluminum triangular connection seat (5) symmetrically fixed on both sides of the aluminum housing (1), and an external threaded column (6) is fixedly connected to the middle position of the inner bottom surface of the aluminum triangular connection seat (5); A connecting belt (7) is passed through the aluminum triangular connecting seat (5), and a plurality of positioning circular holes (8) are formed on the connecting belt (7) at equal intervals.

5. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 4, characterized in that: The connecting belt (7) is sleeved on the outside of the external threaded column (6) through the positioning circular hole (8), and the connecting belt (7) is connected to the aluminum triangular connecting seat (5) of the plurality of magnetized units, and the bottom surface of the connecting belt (7) and the inner bottom surface of the aluminum triangular connecting seat (5) are in contact with each other.

6. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 5, characterized in that: The connecting belt (7) is provided with a plurality of grooves (16) at equal intervals, and the grooves (16) are arranged in the middle of two adjacent positioning circular holes (8); The connecting belt (7) is made of an elastic bendable material, and the connecting belt (7) is bent through the groove (16) and wound around the FPC soft flat cable (17) outside the pipeline.

7. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 4, characterized in that: The aluminum triangular connecting seat (5) is provided with a reinforcing component for limiting the assembly position of the connecting belt (7).

8. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 7, characterized in that: The reinforcing member comprises a hollow column (9) fixed on an aluminum triangular connecting seat (5), and a through groove (10) is formed on the upper inclined surface of the aluminum triangular connecting seat (5); A fixing pile (11) is connected through the hollow column (9), and an internal thread groove (12) is formed at the lower end of the fixing pile (11).

9. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 8, characterized in that: The through groove (10), the hollow column (9) and the external threaded column (6) are located in corresponding positions, and the fixing pile (11) passes through the hollow column (9) and the through groove (10); The fixing pile (11) is threadedly connected to the external thread column (6) via the internal thread groove (12).

10. The magnetostrictive ultrasonic guided wave detection sensor for a slender thin-walled pipe according to claim 9, characterized in that: A gasket (13) is provided between the connecting belt (7) and the fixing pile (11), and a through hole (14) is provided on the gasket (13). The gasket (13) is sleeved on the outside of the external threaded column (6) through the through hole (14); The cross-sectional area of ​​the gasket (13) is larger than the bottom surface area of ​​the fixing pile (11).

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