CN116087316A

CN116087316A - Rotary alternating current electromagnetic nondestructive testing system design

Info

Publication number: CN116087316A
Application number: CN202310140617.2A
Authority: CN
Inventors: 胡严太; 郭庆; 胡鸿志; 代元涛; 周志高
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-05-09

Abstract

The invention relates to a rotary alternating current electromagnetic nondestructive testing system, which comprises: the system comprises a star-shaped excitation probe module, an excitation signal generator module and a magnetic field signal acquisition module, wherein: the star-shaped excitation probe module is loaded above the defect, and for this purpose, the defect will generate a characteristic signal related to the size thereof; the excitation signal generator module is connected with the star-shaped excitation module and provides excitation for the star-shaped excitation module; the magnetic field signal acquisition module is arranged below the star-shaped excitation module and is used for acquiring characteristic signals of defects. The invention has the advantages of simple structure, small size, high sensitivity for detecting defects in any direction and high practical value.

Description

Rotary alternating current electromagnetic nondestructive testing system design

Technical Field

The invention belongs to the technical field of nondestructive testing, and particularly relates to a rotary alternating current electromagnetic nondestructive testing system.

Background

Ferromagnetic materials are widely applied to the fields of construction, aerospace, energy, transportation and the like due to good plasticity and structural properties, but in a long-term high-strength working environment, the ferromagnetic materials can generate defects such as cracks, corrosion, gaps and the like. Therefore, periodic detection of ferromagnetic materials is necessary.

At present, common nondestructive testing technologies of ferromagnetic materials comprise ultrasonic testing, ray testing, eddy current testing, magnetic powder testing, magnetic leakage testing and the like. The alternating electromagnetic field detection technology (ACFM) is an emerging nondestructive detection technology developed on the basis of eddy current detection and magnetic leakage detection, and compared with the eddy current detection and magnetic leakage detection, the ACFM has the advantages of small influence of speed effect, small influence of lift-off effect on detection signals, high quantization precision and the like. However, the conventional ACFM detection technology has directionality, and has high sensitivity only to the cracks perpendicular to the induced current direction, and low sensitivity to the directions parallel to the induced current direction, so that the phenomena of false detection and missing detection of the defects may occur in the process of detecting the defects.

Disclosure of Invention

The invention aims to: in order to solve the problems in the prior art, the design scheme of the detection system of the rotary alternating current electromagnetic nondestructive detection system is provided, and aims to solve the problems of false detection, missing detection and the like when the existing ACFM detection technology detects defects.

The technical scheme is as follows: the technical scheme adopted by the invention is as follows:

a rotary ac electromagnetic nondestructive inspection system comprising: the excitation system comprises a star-shaped excitation probe module, an excitation signal generator module and a magnetic field signal acquisition module, wherein the excitation signal generator module is connected with the star-shaped excitation module, and the magnetic field signal acquisition module is arranged below the star-shaped excitation module.

The star-shaped excitation probe module consists of a star-shaped iron core, an excitation coil and a fixed bracket. The star-shaped iron core is star-shaped and is made of unoriented silicon steel sheets. The exciting coil is made of copper enameled wires and is wound on 6 pole shoes of the star-shaped iron core. The fixing support is formed by 3D printing, and an inner groove of the fixing support is matched with the top of the star-shaped iron core and is used for fixing the star-shaped iron core.

The excitation signal generator module comprises a power supply module, a singlechip module and a three-phase signal generator module.

The power supply module uses direct current of +/-24V as an input signal, and can output direct current signals of +/-15V, +/-5V, 3.3V, 2.5V and 1V through a series of power supply conversion to provide power supply for other modules.

The single chip microcomputer module comprises a display module, a minimum single chip microcomputer system and a matrix keyboard module. And the minimum singlechip system is used for communicating with the upper computer and controlling other modules. The display module is controlled by the minimum system module of the singlechip and is used for displaying the frequency of the current output signal. The matrix key module is used as the input of the minimum system module of the singlechip and is used for changing the frequency of the current output signal.

The three-phase signal generator module consists of an MOS tube driving chip and an MOS tube. The single chip microcomputer module controls the MOS tube driving chip to enable the MOS tube to output three SPWM waveforms, and an LC filter is used for filtering out higher harmonics, so that three-phase pure sine wave alternating current voltage can be obtained, and an excitation signal is provided for an excitation coil in the star-shaped excitation probe module.

The magnetic field signal acquisition module consists of a TMR sensor array and a filtering amplifying circuit.

Wherein the TMR sensor array consists of 3 TMR2301 chips which are transversely arranged, 3 TMR2301 chips which are longitudinally arranged and 3 TMR2505 chips. Wherein, TMR2505 chip is used for gathering Z axle magnetic field signal, and TMR2301 chip that transversely places is used for gathering X axle magnetic field signal, and TMR2301 chip that vertically places is used for gathering Y axle magnetic field signal.

The filtering amplifying circuit consists of a unit gain second-order voltage-controlled low-pass filter and a differential amplifying circuit. The cut-off frequency of the unit gain second-order voltage-controlled low-pass filter is 15KHZ, and the amplification factor of the differential amplification circuit is adjustable.

Compared with the prior art, the invention has the following beneficial technical effects: simple structure, small size, high sensitivity for detecting defects in any direction and high practical value.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of components of a rotary AC electromagnetic nondestructive testing system.

Fig. 2 is a schematic diagram of a star-shaped excitation probe module structure.

FIG. 3 is a schematic diagram of an excitation signal generator module.

Fig. 4 is a schematic circuit diagram of a three-phase signal generator module.

Fig. 5 is a schematic circuit diagram of a magnetic field signal acquisition module.

The reference numerals in the figures illustrate:

the magnetic field sensor comprises a 1-ferromagnetic material test piece, a 2-star-shaped excitation probe module, a 3-excitation signal generator module, a 4-magnetic field signal acquisition module, a 5-star-shaped iron core, a 6-excitation coil, a 7-fixed support, an 8-power supply module, a 9-singlechip module, a 10-three-phase signal generator module, an 11-display module, a 12-minimum singlechip system, a 13-matrix key module, a 14-TMR sensor array and a 15-filtering amplifying circuit.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Referring to fig. 1 to 5, fig. 1 is a schematic diagram of a component of a rotary ac electromagnetic nondestructive testing system, fig. 2 is a schematic diagram of a star-type excitation probe module, fig. 3 is a schematic diagram of an excitation signal generator module, fig. 4 is a schematic diagram of a three-phase signal generator module, and fig. 5 is a schematic diagram of a magnetic field signal acquisition module. The invention provides a rotary alternating current electromagnetic nondestructive testing system, which comprises: the device comprises a ferromagnetic material test piece 1, a star-shaped excitation probe die 2, an excitation signal generator module 3 and a magnetic field signal acquisition module 4. The excitation signal generator module 3 is connected with the star-shaped excitation module 2, and the magnetic field signal acquisition module 4 is arranged below the star-shaped excitation module 2.

Furthermore, the star-shaped excitation probe module 2 consists of a star-shaped iron core 5, an excitation coil 6 and a fixed bracket 7. The star-shaped iron core 5 is star-shaped and is made of unoriented silicon steel sheets. The exciting coil 6 comprises 6 coils, is made of 0.6mm copper enameled wires, has 300 turns, and is wound on 6 pole shoes of the star-shaped iron core 2 by taking two symmetrical coils as a pair. The fixing support 7 is formed by 3D printing, and 6 convex grooves are formed in the fixing support and meshed with the top of the star-shaped iron core 5. The star-shaped iron core 5 is fixed in the convex groove of the fixed bracket 7, and the pole shoe passes through the coil and 6 rectangular holes of the magnetic field signal acquisition module 4.

The excitation signal generator module 3 comprises a power supply module 8, a singlechip module 9 and a three-phase signal generator module 10.

Furthermore, the power module 8 uses ±24v direct current as an input signal, and can output ±15v, ±5v, 3.3v, 2.5v, and 1V direct current signals through a series of power conversion to provide power for other modules.

Further, the single-chip microcomputer module 9 comprises a display module 11, a minimum single-chip microcomputer system 12 and a matrix key module 13. A minimal single chip system 12 for communicating with the host computer and controlling other modules. The display module 11 is controlled by the singlechip minimum system module 12 and is used for displaying the frequency of the current output signal. The matrix key module 13 is used as an input of the single-chip microcomputer minimum system module 12 for changing the frequency of the current output signal.

Further, the three-phase signal generator module 10 includes 3 MOS transistor driving chips and 6 MOS transistors. The minimum singlechip module 12 controls the MOS tube driving chip to enable the MOS tube to output three SPWM waveforms, and the LC filter is used for filtering out higher harmonics, so that three-phase pure sine wave alternating current voltage can be obtained, and an excitation signal is provided for the excitation coil 6 in the star-shaped excitation probe module 2.

The magnetic field signal acquisition module 4 consists of a TMR sensor array 14 and a filtering amplifying circuit 15.

Further, the TMR sensor array 14 is composed of 3 TMR2301 chips placed laterally, 3 TMR2301 chips placed longitudinally, and 3 TMR2505 chips. Wherein, TMR2505 chip is used for gathering Z axle magnetic field signal, and TMR2301 chip that transversely places is used for gathering X axle magnetic field signal, and TMR2301 chip that vertically places is used for gathering Y axle magnetic field signal.

Further, the filtering and amplifying circuit 15 is composed of a unit gain second-order voltage-controlled low-pass filter and a differential amplifying circuit. The cut-off frequency of the unit gain second-order voltage-controlled low-pass filter is 15KHZ, and the amplification factor of the differential amplification circuit is adjustable.

In this embodiment, the singlechip module 9 is programmed by the upper computer in advance, the frequency to be used is input by the matrix keyboard module 13, and the current signal frequency is displayed by the display module 12. After being electrified, the star-shaped excitation probe module 2 generates magnetic induction lines, the magnetic induction lines are concentrated by the star-shaped iron cores 5 and then are injected into the ferromagnetic material test piece 1, a rotating magnetic field is generated inside the ferromagnetic material test piece 1, then induced currents with equal intensity and changing direction along with time are formed on the surface of the ferromagnetic material test piece 1, and the characteristic signals of defects can be obtained by detecting the magnetic field generated by the induced currents.

The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.

Claims

1. The design of the rotary alternating current electromagnetic nondestructive testing system is characterized in that: comprising the following steps: the excitation system comprises a star-shaped excitation probe module, an excitation signal generator module and a magnetic field signal acquisition module, wherein the excitation signal generator module is connected with the star-shaped excitation module, and the magnetic field signal acquisition module is arranged below the star-shaped excitation module.

2. A rotary ac electromagnetic nondestructive testing system design according to claim 1, wherein: the star-shaped excitation probe module consists of a star-shaped iron core, an excitation coil and a fixed bracket. The exciting coil is wound on a pole shoe of the star-shaped iron core, and the star-shaped iron core is arranged in the fixed support.

3. A rotary ac electromagnetic nondestructive testing system design according to claim 1, wherein: the excitation signal generator module comprises a power supply module, a singlechip module and a three-phase signal generator module.

4. A rotary ac electromagnetic nondestructive testing system design according to claim 1, wherein: the magnetic field signal acquisition module consists of a TMR sensor array and a filtering amplifying circuit.

5. A rotary ac electromagnetic nondestructive testing system design according to claim 3, wherein: the power supply module uses direct current of +/-24V as an input signal, and can output direct current signals of +/-15V, +/-5V, 3.3V, 2.5V and 1V through a series of power supply conversion.

6. A rotary ac electromagnetic nondestructive testing system design according to claim 3, wherein: the single-chip microcomputer module comprises a display module, a minimum single-chip microcomputer system and a matrix keyboard module. The minimum singlechip system is used for communicating with the upper computer and controlling other modules. The display module is controlled by the singlechip minimum system module and is used for displaying the frequency of the current output signal. The matrix key module is used as the input of the minimum system module of the singlechip and is used for changing the frequency of the current output signal.

7. A rotary ac electromagnetic nondestructive testing system design according to claim 3, wherein: the three-phase signal generator module consists of an MOS tube driving chip and an MOS tube. The single chip microcomputer module controls the MOS tube driving chip to enable the MOS tube to output three SPWM waveforms, and the LC filter is used for filtering out higher harmonics, so that three-phase pure sine wave alternating current voltage can be obtained, and an excitation signal is provided for an excitation coil in the star-shaped excitation probe module.

8. The rotary ac electromagnetic non-destructive inspection system design according to claim 4, wherein: the TMR sensor array consists of 3 TMR2301 chips which are transversely arranged, 3 TMR2301 chips which are longitudinally arranged and 3 TMR2505 chips. Wherein, TMR2505 chip is used for gathering Z axle magnetic field signal, and TMR2301 chip that transversely places is used for gathering X axle magnetic field signal, and TMR2301 chip that vertically places is used for gathering Y axle magnetic field signal.

9. The rotary ac electromagnetic non-destructive inspection system design according to claim 4, wherein: the filtering amplifying circuit consists of a unit gain second-order voltage-controlled low-pass filter and a differential amplifying circuit. The cut-off frequency of the unit gain second-order voltage-controlled low-pass filter is 15KHZ, and the amplification factor of the differential amplification circuit is adjustable.