A pipeline inner wall crack detection probe

Abstract

The invention discloses a pipeline inner wall crack detection probe, which includes a probe housing, a Lemo joint, an amplifying circuit, an excitation module and a TMR magnetic sensor; the Lemo joint, the amplifying circuit, the excitation module and the TMR magnetic sensor are all fixed on the probe housing. The invention has the beneficial effects of: being able to detect cracks in any direction on the inner wall of the pipeline; the array sensor design, a single scan can effectively detect the inner wall of the pipeline; strong versatility, can adapt to different pipeline diameters; simple operation, easy to use.

Description

Technical Field

[0001] The invention belongs to the field of detection probes, and in particular relates to a pipeline inner wall crack detection probe. Background Art

[0002] The Rotating Alternating Current Field Measurement (RACFM) technology is to load two sets of excitation coils that are perpendicular to each other in space with alternating current of the same frequency and amplitude and a phase difference of 90°, generating a magnetic field that rotates uniformly in the direction of the magnetic induction vector in space, and then inducing a uniform alternating current that rotates at a fixed period in the workpiece. The induced current generates disturbances at the defect location. Based on the principle that electric field disturbances cause spatial magnetic field distortion, the detection sensor is used to measure the spatial magnetic field distortion signal, thereby realizing defect detection and evaluation. This technology can detect surface cracks, fractures and other defects in conductive materials without pre-cleaning the area to be detected or removing the protective paint layer on the workpiece surface in advance.

[0003] According to the working principle of traditional ACFM, since the direction of the electric field lines is fixed, cracks that are perpendicular to the electric field lines can be well detected. However, in reality, the direction of the crack is arbitrary. When the angle between the crack direction and the electric field line direction becomes smaller, the electric field disturbance caused by the defect becomes smaller. When the crack direction is parallel to the current direction, the electric field hardly deflects. When the induced electromagnetic field distortion is small, missed detection may occur. Based on the rotating AC electromagnetic field detection technology, the present invention proposes a new pipeline inner wall crack detection probe that can meet the detection needs of cracks in any direction on the inner wall of the pipeline. Summary of the invention

[0004] The purpose of the present invention is to provide a pipeline inner wall crack detection probe, which can detect cracks in any direction on the pipeline inner wall, can simultaneously detect the BX signal and BZ signal of the crack, has high detection sensitivity, and can detect all cracks on the pipeline inner wall with a single scan.

[0005] The technical solution of the present invention is as follows: a pipeline inner wall crack detection probe, which includes a probe housing, a Lemo joint, an amplifier circuit, an excitation module and a TMR magnetic sensor; the Lemo joint, the amplifier circuit, the excitation module and the TMR magnetic sensor are all fixed on the probe housing.

[0006] The probe housing comprises a first probe housing, a second probe housing and a third probe housing.

[0007] The first probe housing comprises a first probe housing body, a Lemo joint fixing groove is formed on the first probe housing body, and the Lemo joint is fixed through the Lemo joint fixing groove.

[0008] The second probe housing comprises a second probe housing body, and an amplifying circuit is fixed on the second probe housing body, and the amplifying circuit is fixed through an amplifying circuit fixing groove.

[0009] The third probe housing comprises a third probe housing body, and a magnetic core fixing groove and a TMR magnetic sensor fixing groove are arranged on the inner wall surface of the third probe housing body. The magnetic core is fixed by the magnetic core fixing groove, and the TMR magnetic sensor is fixed by the TMR magnetic sensor fixing groove.

[0010] The excitation module comprises a magnetic core and a first coil and a second coil wound around the magnetic core. A rotating excitation magnetic field is generated by passing sinusoidal excitation signals with a phase difference of 90° into the first coil and the second coil.

[0011] There are 8 TMR magnetic sensors in total, which are evenly surrounded on the inner wall of the third probe housing body and connected to the amplification circuit.

[0012] The beneficial effects of the present invention are: it can realize the detection of cracks in any direction on the inner wall of the pipeline; the array sensor design can effectively detect the inner wall of the pipeline with a single scan; it has strong versatility and can adapt to different pipeline diameters; it is simple to operate and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an overall schematic diagram of a pipeline inner wall crack detection probe according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the explosion structure of a pipeline inner wall crack detection probe in an embodiment of the present invention;

[0015] Figure 3 Schematic diagram of the internal structure of the first probe housing in an embodiment of the present invention;

[0016] Figure 4 Schematic diagram of the internal structure of the second probe housing in an embodiment of the present invention;

[0017] Figure 5 Schematic diagram of the internal structure of the third probe housing in an embodiment of the present invention.

[0018] In the figure, 10 is a probe housing, 20 is a Lemo connector, 30 is an amplifier circuit, 40 is an excitation module, 50 is a TMR magnetic sensor, 101 is a first probe housing, 102 is a second probe housing, 103 is a third probe housing, 401 is a magnetic core, 402 is a first coil, 403 is a second coil, 1011 is a first probe housing body, 1012 is a Lemo connector fixing groove, 1021 is a second probe housing body, 1022 is an amplifier circuit fixing groove, 1031 is a third probe housing body, 1032 is a magnetic core fixing groove, and 1033 is a TMR magnetic sensor fixing groove. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0021] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a pipeline inner wall crack detection probe, including a probe housing 10, a Lemo joint 20, an amplifier circuit 30, an excitation module 40 and a TMR magnetic sensor 50. The Lemo joint 20, the amplifier circuit 30, the excitation module 40 and the TMR magnetic sensor 50 are all fixed on the probe housing 10 through a groove. The probe housing 10 includes a first probe housing 101 in the form of a disc, a second probe housing 102 in the form of a sheet and a third probe housing 103 in the form of a cylinder.

[0022] like Figure 3 As shown, the first probe housing 101 comprises a disc-shaped first probe housing body 1011, and a circular Lemo joint fixing groove 1012 is formed on the first probe housing body 1011. The Lemo joint 20 is fixed through the Lemo joint fixing groove 1012.

[0023] like Figure 4 As shown, the second probe housing 102 includes a sheet-shaped second probe housing body 1021, and a square amplifier circuit fixing groove 1022 is opened on the second probe housing body 1021. The amplifier circuit 30 is fixed through the amplifier circuit fixing groove 1022.

[0024] like Figure 5 As shown, the third probe housing 103 includes a cylindrical third probe housing body 1031, and a magnetic core fixing groove 1032 and a TMR magnetic sensor fixing groove 1033 are arranged on the inner wall surface of the third probe housing body 1031. The magnetic core 40 is fixed by the magnetic core fixing groove 1032, and the TMR magnetic sensor 50 is fixed by the TMR magnetic sensor fixing groove 1033.

[0025] Among them, the Lemo connector 20 connects the excitation signal and power supply voltage of the chassis to the pipeline inner wall crack detection probe, and transmits the detection signal of the pipeline inner wall crack detection probe back to the chassis. The excitation module 40 includes a magnetic core 401 and a first coil 402 and a second coil 403 wound on the magnetic core 401. A rotating excitation magnetic field is generated by passing a sinusoidal excitation signal with a phase difference of 90° into the first coil 402 and the second coil 403. There are 8 TMR magnetic sensors 50, which are evenly surrounded on the inner wall of the third probe housing body 1031 and connected to the amplifier circuit 30. The TMR magnetic sensor 50 picks up the BX signal and the BZ signal, and the detected signal is transmitted to the amplifier circuit 30 for further amplification and processing.

Claims

1. A pipeline inner wall crack detection probe, characterized in that: It includes a probe housing, a Lemo connector, an amplifying circuit, an excitation module and a TMR magnetic sensor; the Lemo connector, the amplifying circuit, the excitation module and the TMR magnetic sensor are all fixed on the probe housing; The probe housing comprises a first probe housing, a second probe housing and a third probe housing; The first probe housing comprises a first probe housing body, the first probe housing body is provided with a Lemo joint fixing groove, and the Lemo joint is fixed through the Lemo joint fixing groove; The second probe housing comprises a second probe housing body, and an amplifying circuit is fixed on the second probe housing body, and the amplifying circuit is fixed through an amplifying circuit fixing groove; The third probe housing comprises a third probe housing body, and a magnetic core fixing groove and a TMR magnetic sensor fixing groove are arranged on the inner wall surface of the third probe housing body. The magnetic core is fixed by the magnetic core fixing groove, and the TMR magnetic sensor is fixed by the TMR magnetic sensor fixing groove.

2. A pipeline inner wall crack detection probe as claimed in claim 1, characterized in that: The excitation module comprises a magnetic core and a first coil and a second coil wound around the magnetic core. A rotating excitation magnetic field is generated by passing sinusoidal excitation signals with a phase difference of 90° into the first coil and the second coil.

3. A pipeline inner wall crack detection probe as claimed in claim 1, characterized in that: There are 8 TMR magnetic sensors in total, which are evenly surrounded on the inner wall of the third probe housing body and connected to the amplification circuit.

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