CN-121994912-A - Pipeline defect identification sensor, device and method

CN121994912ACN 121994912 ACN121994912 ACN 121994912ACN-121994912-A

Abstract

The invention provides a pipeline defect identification sensor, a device and a method, wherein the pipeline defect identification sensor comprises a magnetic yoke, a high-frequency alternating-current coil, a direct-current coil and an induction coil, the magnetic yoke comprises a cross beam and side arms, the cross beam is arranged on the side arms to form an open end, the high-frequency alternating-current coil is sleeved on the cross beam of the magnetic yoke to apply sinusoidal alternating-current excitation to generate a detection magnetic field, the direct-current coil is sleeved on the side arms of the magnetic yoke to apply direct-current excitation to saturate or nearly saturate the detection magnetic field, the open end of the magnetic yoke is arranged above a pipeline to enable the pipeline to generate a vortex field based on the saturated or nearly saturated detection magnetic field, and the induction coil is arranged between the magnetic yoke and the pipeline to induce the vortex field generated by the pipeline to obtain an induction signal to detect the pipeline defect.

Inventors

WANG QIANG
WANG ANQUAN
HAN QING
LIU JIN
SHI XIAN
LI QIANG
YANG CHAO
HAN WEI
LIU YANFENG

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. The pipeline defect identification sensor is characterized by comprising a magnetic yoke (1), a high-frequency alternating current coil (2), a direct current coil (3) and an induction coil (4); the magnetic yoke (1) comprises a cross beam and a side arm, wherein the cross beam is arranged on the side arm to form an opening end; The high-frequency alternating current coil (2) is sleeved on the cross beam of the magnetic yoke (1) so that the central axis of the high-frequency alternating current coil (2) is consistent with the central axis of the cross beam to apply sinusoidal alternating current excitation to generate a detection magnetic field; The direct current coil (3) is sleeved on the side arm of the magnetic yoke (1) so that the central axis of the direct current coil (3) is consistent with the central axis of the side arm to apply direct current excitation to saturate or nearly saturate the detection magnetic field; The open end of the magnetic yoke (1) is positioned above the pipeline so that the pipeline generates a vortex field based on the saturated or nearly saturated detection magnetic field; The induction coil (4) is arranged between the magnetic yoke (1) and the pipeline to induce a vortex field generated by the pipeline to obtain an induction signal so as to detect pipeline defects.
2. A pipeline defect recognition device, which is characterized by comprising a scanning module (5), the pipeline defect recognition sensor according to claim 1, a signal excitation module (6) and a storage module (7): The scanning module (5) is used for controlling the pipeline defect recognition sensor to scan the pipeline; the signal excitation module (6) is connected with the high-frequency alternating current coil (2) to provide sinusoidal alternating current excitation for the high-frequency alternating current coil (2) and is connected with the direct current coil (3) to provide direct current excitation for the direct current coil (3); the storage module (7) converts the induction signals into voltage digital signals and stores the voltage digital signals so as to detect pipeline defects.
3. The pipeline defect recognition device according to claim 2, wherein the signal excitation module (6) comprises a direct current voltage stabilizing source (61) and an alternating current excitation source (62), the direct current voltage stabilizing source (61) is connected with the direct current coil (3) to provide direct current excitation for the direct current coil (3) so as to saturate or nearly saturate the detection magnetic field, the alternating current excitation source (62) is connected with the high-frequency alternating current coil (2) to provide sinusoidal alternating current excitation for the high-frequency alternating current coil (2), and the high-frequency alternating current coil (2) generates a detection magnetic field based on the sinusoidal alternating current excitation.
4. A pipe defect identification device according to claim 2, characterized in that the memory module (7) comprises a signal collector (71), an commander (72); the signal collector (71) is used for performing analog-to-digital conversion processing on the induction signal to obtain a voltage digital signal; the commander (72) is connected with the collector for analyzing defects of the pipe based on the voltage digital signal.
5. The pipe defect identifying device according to claim 4, wherein the signal collector (71) comprises a signal conditioning module (711), a data acquisition module (712): The signal conditioning module (711) is used for filtering and amplifying the induction signal to obtain a processed voltage analog signal; the data acquisition module (712) is connected with the signal conditioning module (711) and is used for performing analog-to-digital conversion processing on the processed voltage analog signals to obtain voltage digital signals and storing the voltage digital signals.
6. The pipe defect recognition apparatus of claim 5, wherein said signal conditioning module (711) comprises a band pass filter: The band-pass filter is used for filtering and amplifying the voltage analog signals in the induction signals.
7. The pipe defect identifying apparatus of claim 6, wherein the band pass filter comprises a high pass filter, a low pass filter, an amplifier: the high-pass filter is used for filtering low-frequency noise in the induction signal; the low-pass filter is used for filtering high-frequency noise in the induction signal; the amplifier is used for amplifying the voltage analog signal in the sensing signal.
8. The pipe defect identifying apparatus as set forth in claim 4, wherein said commander (72) comprises a calculator (721), a triaxial stage (722): -the calculator (721) sending a scanning instruction to the triaxial workstation (722); The triaxial bench (722) controls the pipeline defect recognition sensor to scan the pipeline based on the scanning instruction.
9. The pipeline defect recognition device according to claim 8, wherein the data acquisition module (712) comprises an a/D conversion module, a data connection line: The A/D conversion module is connected with the signal conditioning module (711) and is used for carrying out analog-to-digital conversion processing on the processed voltage analog signal to obtain the voltage digital signal; one end of the data connecting wire is connected with the A/D conversion module, and the other end of the data connecting wire is connected with the commander (72) so as to transmit the voltage digital signal to a memory for storage.
10. A method of identifying a pipe defect, comprising: Controlling the pipeline defect recognition sensor to scan the pipeline based on a scanning module (5); A signal excitation module (6) is connected with a high-frequency alternating current coil (2) in the pipeline defect recognition sensor so as to provide sinusoidal alternating current excitation for the high-frequency alternating current coil (2) and connected with the direct current coil (3) so as to provide direct current excitation for the direct current coil (3); detecting based on a pipeline defect recognition sensor to sense a vortex field generated by the pipeline to obtain a sensing signal; the induction signals are converted into voltage digital signals based on the storage module (7) and stored so as to detect pipeline defects.

Description

Pipeline defect identification sensor, device and method Technical Field The invention belongs to the technical field of nondestructive testing, and particularly relates to a pipeline defect identification sensor, a device and a method. Background The electromagnetic nondestructive detection technology is a non-invasive detection method, has the characteristics of non-contact, rapidness, accuracy and the like, can detect under the condition of not damaging a target object, is widely applied to the fields of pipeline engineering, aerospace, electric power and the like, and provides important support for safety and reliability of industrial facilities. In-pipe inspection, electromagnetic nondestructive inspection technology detects problems such as changes in pipe wall thickness, corrosion, defects or other defects inside pipes by utilizing the principle of electromagnetic field interaction to determine the health and reliability of the pipes. The prior art discloses a method and a device for identifying cracks on the inner wall and the outer wall of a focusing magnetic flux leakage composite detection, wherein the method is applied to the field of pipeline detection, and the device comprises a magnetic focusing iron yoke, a pole shoe or a steel brush, a permanent magnet and an iron yoke; the magnetic focusing iron yoke is positioned at an eccentric position and is used for forming an end magnetic field focusing effect, the permanent magnets are symmetrically distributed and positioned above the pole shoe or the steel brush and used for saturation magnetization of the tested sample, the iron yoke is positioned above the magnetic focusing iron yoke and the permanent magnets and used for forming a saturation magnetization loop, and the pole shoe or the steel brush is symmetrically distributed and positioned below the two permanent magnets with opposite magnetization directions. The existing method has insufficient internal detection capability for defects with different angles on the inner wall of the pipeline and defects with different depths on the inner wall and the outer wall of the pipeline, has insufficient detection capability for defects with smaller included angles with magnetic lines, is difficult to identify defect-like defects, is suitable for detecting near-surface defects of ferromagnetic materials, is influenced by skin effect, and is difficult to characterize defect depth information. Disclosure of Invention Based on the above problems, the embodiments of the present application provide a sensor, a device and a method for identifying a pipe defect, so as to solve the problems in the prior art. The embodiment of the application discloses a pipeline defect identification sensor which comprises a magnetic yoke 1, a high-frequency alternating-current coil 2, a direct-current coil 3 and an induction coil 4, wherein the magnetic yoke 1 comprises a cross beam and side arms, the cross beam is arranged on the side arms to form an opening end, the high-frequency alternating-current coil 2 is sleeved on the cross beam of the magnetic yoke 1, so that the central axis of the high-frequency alternating-current coil 2 is consistent with the central axis of the cross beam to apply sinusoidal alternating-current excitation to generate a detection magnetic field, the direct-current coil 3 is sleeved on the side arms of the magnetic yoke 1, so that the central axis of the direct-current coil 3 is consistent with the central axis of the side arms to apply direct-current excitation to enable the detection magnetic field to be saturated or nearly saturated, the opening end of the magnetic yoke 1 is arranged above a pipeline to enable the pipeline to generate a vortex field based on the saturated or nearly saturated detection magnetic field, and the induction coil 4 is arranged between the magnetic yoke 1 and the pipeline to induce the vortex field generated by the pipeline to obtain an induction signal to detect pipeline defects. The application also provides a pipeline defect identification device which comprises a scanning module 5, the pipeline defect identification sensor as claimed in claim 1, a signal excitation module 6 and a storage module 7, wherein the scanning module 5 is used for controlling the pipeline defect identification sensor to scan the pipeline, the signal excitation module 6 is connected with the high-frequency alternating-current coil 2 to provide sine alternating-current excitation for the high-frequency alternating-current coil 2 and is connected with the direct-current coil 3 to provide direct-current excitation for the direct-current coil 3, and the storage module 7 is used for converting the induction signal into a voltage digital signal and storing the voltage digital signal to detect the pipeline defect. Optionally, the alternating current excitation source 62 comprises a signal generator 621 and a power amplifier 622, wherein the signal generator 621 is connected with the power amplifie