An asymmetrically excited proximity tube detection array probe

Abstract

The utility model discloses an asymmetric excitation proximity tube detection array probe relates to pipeline nondestructive testing technical field, including first support petal group and second support petal group, the inside of first support petal group is provided with signal processing module, the inside of second support petal group is provided with sensor module, second support petal group is connected with first support petal group through the bellows, the other end of first support petal group is provided with nylon tube, the other end of second support petal group is provided with the pilot head, realized to the high sensitivity detection of pipeline interval change, can complete full circumferential scanning without rotating, effectively overcome the traditional probe to the defect direction insensitivity, the low signal -to -noise ratio, the detection efficiency difference etc.

Description

Technical Field

[0001] This utility model relates to the field of pipeline non-destructive testing technology, and in particular to an asymmetric excitation proximity pipe detection array probe. Background Technology

[0002] In the piping system of a nuclear power plant steam generator, a large number of pipes are usually arranged in a close parallel and interlaced manner. Due to the obstruction of external insulation layers, concrete encapsulation or other pipes, the condition of the outer wall of many pipes and their distance from adjacent pipes cannot be directly observed and measured. This distance is a key indicator for assessing whether the pipes have deformed or dented due to vibration, wear or external impact, and is crucial for assessing the structural integrity and safety of the system.

[0003] In the existing technology, the method for detecting such pipes is usually to use an accessible pipe, i.e., an access pipe, to insert an eddy current probe and indirectly detect the target pipe next to it through the "proximity effect" of the electromagnetic field. Traditional proximity pipe detection probes mostly use a single coil or symmetrical coil design.

[0004] These probes have some inherent drawbacks: they are not sensitive to the direction of defects and have difficulty distinguishing between circumferential and axial defects; they have a low signal-to-noise ratio, especially when the target tube is far away, the effective signal is weak; and they have low detection efficiency, usually requiring rotational scanning to cover the entire circumference of the tube wall, which is cumbersome and time-consuming.

[0005] Therefore, an asymmetric excitation proximity tube detection array probe is provided to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide an asymmetric excitation proximity tube detection array probe that achieves high detection sensitivity, circumferential full-coverage scanning without rotation, and sensitivity to distance changes in the proximity tube, thereby meeting the detection requirements of the heat transfer tubes in nuclear power plant steam generators.

[0007] To achieve the above objectives, this utility model provides an asymmetric excitation proximity tube detection array probe, including a first support petal group and a second support petal group. The first support petal group is equipped with a signal processing module, and the second support petal group is equipped with a sensor module. The second support petal group is connected to the first support petal group through a corrugated pipe. A nylon tube is provided at the other end of the first support petal group, and a guide head is provided at the other end of the second support petal group.

[0008] Preferably, the first support petal group includes two opposing first support petals, and the second support petal group includes two opposing second support petals. Both the first and second support petals include a support tube and a plurality of petals disposed on the outer surface of the support tube. The plurality of petals are uniformly fixed circumferentially at the root of the support tube.

[0009] Preferably, the signal processing module includes a signal processing PCB package skeleton and a signal processing PCB disposed inside the signal processing PCB package skeleton, wherein both ends of the signal processing PCB package skeleton are fixedly connected to the support pipes of the two first support petals respectively.

[0010] Preferably, the sensor module includes a first sensor PCB support frame and a second sensor PCB support frame arranged opposite to each other. The first sensor PCB support frame and the second sensor PCB support frame are respectively fixedly connected to the support pipes of the two second support petals. A circular sensor PCB is provided on the first sensor PCB support frame.

[0011] Preferably, the circular sensor PCB is provided with a secondary coil and a plurality of TMR magnetoresistive sensors. The secondary coil is printed on the outer ring of the circular sensor PCB. The number of TMR magnetoresistive sensors is set to 32. The 32 TMR magnetoresistive sensors are arranged at equal intervals along the circumference on the outer ring of the circular sensor PCB, and the arrangement method is wire bonding.

[0012] Preferably, a main coil is wound on the outer wall annular groove of the second sensor PCB support frame. The main coil and the secondary coil are connected in series through a solder pad. The solder pad, the circular sensor PCB and the signal processing PCB, and the solder pad, the signal processing PCB and the data acquisition instrument are all connected through a coaxial line. The coaxial line is located inside the corrugated pipe.

[0013] Preferably, the signal processing PCB packaging skeleton, the first sensor PCB support skeleton, and the second sensor PCB support skeleton are all made of insulating material, and the petals are made of highly elastic nylon material.

[0014] Therefore, the asymmetric excitation proximity tube detection array probe of this invention, with the above-described structure, has the following beneficial effects: (1) The probe of this scheme adopts an asymmetrical arrangement of main and auxiliary coils and 32 TMR magnetoresistive sensors, which can effectively enhance the magnetic field response to the change of target pipe distance and improve the detection sensitivity. At the same time, the TMR sensor array can identify defects in different directions, solving the problem that traditional probes are not sensitive to defect directions. (2) The probe in this scheme uses 32 TMR sensors arranged at equal intervals along the circumference to form a complete detection array, which can achieve full circumferential scanning of the pipeline without rotation. This not only improves detection efficiency, but also simplifies the operation process and is suitable for the space-constrained pipeline environment of nuclear power plants; (3) The probe in this design adopts a petal support structure and an insulating skeleton design to ensure that it moves centrally within the pipe, effectively reducing the impact of the lift-off effect. The signal processing module is integrated inside the probe and transmits signals through a coaxial cable, which enhances the system's anti-interference capability and ensures signal quality and detection reliability.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an asymmetric excitation proximity tube detection array probe according to the present invention; Figure 2 This is a triaxial side view of the sensor module of this utility model; Figure 3 This is a side view of the sensor module of this utility model; Figure 4 This is a schematic diagram illustrating the working principle of the sensor module of this utility model.

[0017] The components are: 1. First supporting petal group; 2. Second supporting petal group; 3. Corrugated pipe; 4. Nylon tube; 5. Guide head; 6. First supporting petal; 7. Second supporting petal; 8. Support pipeline; 9. Petal; 10. Signal processing module; 11. Signal processing PCB package skeleton; 12. Sensor module; 13. First sensor PCB support skeleton; 14. Second sensor PCB support skeleton; 15. Circular sensor PCB; 16. Secondary coil; 17. TMR magnetoresistive sensor; 18. Main coil; 19. Pad; 20. Coaxial cable; 21. Signal processing PCB. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship will also change accordingly.

[0020] Example like Figures 1-4 As shown, this utility model provides an asymmetric excitation proximity tube detection array probe, including a first support petal group 1 and a second support petal group 2. The second support petal group 2 is connected to the first support petal group 1 through a corrugated pipe 3. A nylon tube 4 is provided at the other end of the first support petal group 1, and the length of the nylon tube 4 is set to 30m. A guide head 5 is provided at the other end of the second support petal group 2.

[0021] The first support petal group 1 includes two oppositely arranged first support petals 6, and the second support petal group 2 includes two oppositely arranged second support petals 7. Both the first support petal 6 and the second support petal 7 include a support pipe 8 and multiple petals 9 arranged on the outer surface of the support pipe 8. The multiple petals 9 are evenly fixed in the circumferential direction at the root of the support pipe 8 to ensure that the probe moves stably in the pipe and is always located in the center of the pipe, avoiding the influence of the lift-off effect. The petals 9 are made of highly elastic nylon material.

[0022] The first supporting petal group 1 is equipped with a signal processing module 10. The signal processing module 10 includes a signal processing PCB package frame 11 and a signal processing PCB 21 disposed inside the signal processing PCB package frame 11. The two ends of the signal processing PCB package frame 11 are fixedly connected to the support pipes 8 of the two first supporting petals 6 respectively.

[0023] The second support petal group 2 is equipped with a sensor module 12. The sensor module 12 includes a first sensor PCB support frame 13 and a second sensor PCB support frame 14 arranged opposite to each other. The first sensor PCB support frame 13 and the second sensor PCB support frame 14 are respectively fixedly connected to the support pipes 8 of the two second support petals 7. The signal processing PCB packaging frame 11, the first sensor PCB support frame 13 and the second sensor PCB support frame 14 are all made of insulating material.

[0024] A circular sensor PCB 15 is mounted on the first sensor PCB support frame 13. The circular sensor PCB 15 is equipped with a secondary coil 16 and multiple TMR magnetoresistive sensors 17. The TMR magnetoresistive sensor 17 is a high-sensitivity quantum tunneling effect magnetoresistive sensor. When the external magnetic field changes, its own resistance will change significantly. The magnetic field information is converted into impedance information through the resistance change of the TMR magnetoresistive sensor 17 itself. After subsequent hardware processing circuits and data acquisition instruments process the information, it is finally presented in the software.

[0025] The secondary coil 16 is printed on the outer ring of the circular sensor PCB 15. The number of TMR magnetoresistive sensors 17 is set to 32. The 32 TMR magnetoresistive sensors 17 are evenly spaced along the circumference on the outer ring of the circular sensor PCB 15 and are set by wire bonding.

[0026] The main coil 18 is wound on the outer wall annular groove of the second sensor PCB support frame 14. The main coil 18 is machine-wound to ensure that the generated magnetic field is uniform. The secondary coil 16 is closer to the TMR magnetoresistive sensor 17, while the main coil 18 is farther away from the TMR magnetoresistive sensor 17. The main coil 18 and the secondary coil 16 are asymmetrically distributed about the TMR magnetoresistive sensor 17.

[0027] The main coil 18 and the secondary coil 16 are connected in series via pad 19 to ensure that the current directions of the main coil 18 and the secondary coil 16 are consistent. When AC excitation is applied to the main coil 18 and the secondary coil 16, the magnetic field generated by the main coil 18 near the TMR magnetoresistive sensor 17 can be canceled by the magnetic field generated by the secondary coil 16, while the magnetic field at a distance is still relatively strong. The magnetic field at a distance induces eddy currents on the surface of the proximity tube. According to the lift-off effect, the distance between the proximity tube and the pipe through which the probe passes gradually changes, and the intensity of the eddy current induced in the proximity tube also changes continuously, causing the secondary magnetic field generated by the eddy current to change continuously. This process converts distance information into magnetic field information, and the distance to the proximity tube is determined by detecting the change in this magnetic field.

[0028] Pad 19, the circular sensor PCB 15, and the signal processing PCB 21 are all connected via coaxial cable 20. Coaxial cable 20 is located inside the bellows 3. The signal collected by the TMR magnetoresistive sensor 17 on the circular sensor PCB 15 is transmitted to the signal processing PCB 21. The hardware filtering and amplification circuit on the signal processing PCB 21 preprocesses the signal. The preprocessed signal is transmitted to the host computer via the data acquisition instrument for signal display, processing, and storage on the software side.

[0029] Therefore, this utility model adopts an asymmetric excitation proximity pipe detection array probe with the above-mentioned structure. Through the combination of asymmetric coil layout and high-sensitivity TMR sensor array, it realizes high-sensitivity, high-efficiency, and full-circumference non-destructive testing of pipes without rotation.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. An asymmetric excitation proximity tube detection array probe, characterized in that, It includes a first support petal group and a second support petal group. The first support petal group is equipped with a signal processing module, and the second support petal group is equipped with a sensor module. The second support petal group is connected to the first support petal group through a corrugated pipe. The other end of the first support petal group is equipped with a nylon tube, and the other end of the second support petal group is equipped with a guide head.

2. The asymmetric excitation proximity tube detection array probe according to claim 1, characterized in that, The first support petal group includes two opposing first support petals, and the second support petal group includes two opposing second support petals. Both the first and second support petals include a support tube and a plurality of petals disposed on the outer surface of the support tube. The plurality of petals are uniformly fixed circumferentially at the root of the support tube.

3. The asymmetric excitation proximity tube detection array probe according to claim 2, characterized in that, The signal processing module includes a signal processing PCB package skeleton and a signal processing PCB disposed inside the signal processing PCB package skeleton. The two ends of the signal processing PCB package skeleton are respectively fixedly connected to the support pipes of the two first support petals.

4. The asymmetric excitation proximity tube detection array probe according to claim 3, characterized in that, The sensor module includes a first sensor PCB support frame and a second sensor PCB support frame arranged opposite to each other. The first sensor PCB support frame and the second sensor PCB support frame are respectively fixedly connected to the support pipes of the two second support petals. A circular sensor PCB is provided on the first sensor PCB support frame.

5. The asymmetric excitation proximity tube detection array probe according to claim 4, characterized in that, The circular sensor PCB is provided with a secondary coil and multiple TMR magnetoresistive sensors. The secondary coil is printed on the outer ring of the circular sensor PCB. The number of TMR magnetoresistive sensors is set to 32. The 32 TMR magnetoresistive sensors are arranged at equal intervals along the circumference on the outer ring of the circular sensor PCB, and the arrangement method is wire bonding.

6. The asymmetric excitation proximity tube detection array probe according to claim 5, characterized in that, The main coil is wound on the outer wall annular groove of the second sensor PCB support frame. The main coil and the secondary coil are connected in series through a solder pad. The solder pad, the circular sensor PCB and the signal processing PCB, and the solder pad, the signal processing PCB and the data acquisition instrument are all connected by a coaxial line. The coaxial line is set inside the corrugated pipe.

7. The asymmetric excitation proximity tube detection array probe according to claim 6, characterized in that, The signal processing PCB packaging skeleton, the first sensor PCB support skeleton, and the second sensor PCB support skeleton are all made of insulating material, and the petals are made of highly elastic nylon material.

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