Annular variable-diameter probe based on Barkhausen principle

Abstract

The utility model discloses an annular variable diameter probe based on Barkhausen principle, which is characterized in that an annular probe main body is made of soft magnetic material with high magnetic conductivity, a wound induction coil is arranged on the inner wall of the annular probe main body and used for inducing Barkhausen signals, and an adjusting rod assembly is arranged on the outer wall of the annular probe main body and used for adjusting the outer wall of the annular probe main body. The end, connected with the annular probe body, of the adjusting rod assembly extends into the inner wall of the probe body and is connected with the induction coil, and a shell is arranged on the outer side of the annular probe body and wraps the annular probe body and the adjusting rod assembly. According to the scheme, the probe can be flexibly attached to the surfaces of workpieces with different curvatures and diameters through the variable-diameter adjusting mechanism, the device is suitable for detection of ferromagnetic materials in complex shapes, the inner diameter adjusting precision of the probe is ensured through the high-resolution adjusting rod, the magnetic field coupling uniformity is enhanced, and the Barkhausen signal acquisition reliability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of nondestructive testing, specifically relating to a ring-shaped variable diameter probe based on the Barkhausen principle. Background Technology

[0002] In the field of materials testing technology, Barkhausen's principle has been widely applied to the microstructure analysis, residual stress determination, and hardness assessment of ferromagnetic materials. It is based on the characteristic that irreversible displacement of magnetic domain walls during the magnetization process of ferromagnetic materials generates Barkhausen noise, and this noise signal is detected to obtain information about the material's internal structure.

[0003] However, traditional Barkhausen-based probes often have fixed sizes and shapes, which presents many limitations in practical industrial applications. With the rapid development of manufacturing, the shapes and sizes of ferromagnetic workpieces are becoming increasingly diverse, such as complex-shaped components in aerospace and shafts and pipes of various specifications in machinery manufacturing. Fixed-size probes are difficult to adapt well to workpiece surfaces with various curvatures and diameters, and cannot guarantee the uniformity of magnetic field coupling between the probe and the workpiece during detection, thus affecting the accuracy and reliability of Barkhausen signal acquisition.

[0004] Furthermore, for the inspection of large or batch-produced ferromagnetic components with slightly different specifications, frequently changing probes of different specifications is not only cumbersome, time-consuming, and labor-intensive, but also increases inspection costs and may introduce additional inspection uncertainties due to errors during probe replacement. Therefore, there is an urgent need for a new probe design that can flexibly adapt to different workpiece shapes and sizes to improve the versatility, accuracy, and efficiency of the Barkhausen principle in material inspection, and to meet the modern industrial demand for high-quality, high-efficiency ferromagnetic material inspection. Summary of the Invention

[0005] To address the aforementioned technical deficiencies in the existing technology, this utility model proposes a ring-shaped variable diameter probe based on the Barkhausen principle.

[0006] The technical solution to achieve the purpose of this utility model is as follows:

[0007] A ring-shaped variable diameter probe based on the Barkhausen principle includes an induction coil, a probe body, an adjustment rod assembly, and a housing;

[0008] The ring probe body is made of a soft magnetic material with high magnetic permeability, and the inner wall of the ring probe body is provided with a wound induction coil for sensing Barkhausen signals.

[0009] An adjustment rod assembly is provided on the outer wall of the annular probe body. One end of the adjustment rod assembly, which is connected to the annular probe body, extends into the inner wall of the probe body and is connected to the induction coil.

[0010] The outer shell of the annular probe body is provided, and the shell encloses the annular probe body and the adjusting rod assembly.

[0011] Furthermore, there are multiple sets of induction coils and multiple sets of adjustment rod assemblies, with the induction coils and adjustment rod assemblies being arranged correspondingly.

[0012] Furthermore, the adjusting rod assembly is connected to the motor drive device;

[0013] The motor drive device includes a lead screw and nut pair and a stepper motor. The adjusting rod assembly is connected to the lead screw and nut pair, and the lead screw and nut pair is connected to the output end of the stepper motor.

[0014] Furthermore, the variable diameter probe also includes a signal transmission and processing unit;

[0015] The signal transmission and processing unit is connected to the induction coil and includes a low-noise operational amplifier, a multi-stage active filter, and a digital signal processor to transmit, filter, and amplify the induced Barkhausen signal.

[0016] Furthermore, an elastic fixing unit is provided on the inner wall of the outer shell.

[0017] Furthermore, the inner wall of the outer shell is provided with multiple sets of support frames.

[0018] Furthermore, the induction coil is wound with high-purity copper wire and wrapped with a silver-plated copper foil electromagnetic shielding layer.

[0019] Furthermore, the outer shell is made of low magnetic permeability engineering plastic, and its surface is provided with heat dissipation holes and an antistatic coating.

[0020] Compared with the prior art, the advantages of this utility model are as follows:

[0021] The detection adaptability of this utility model is strong. Through the variable diameter adjustment mechanism, the probe can flexibly fit the surface of workpieces with different curvatures and diameters, and is suitable for the detection of ferromagnetic materials with complex shapes.

[0022] The present invention has high detection accuracy. The present invention uses a high-resolution adjustment rod to ensure the adjustment accuracy of the probe inner diameter (±0.2mm), enhance the uniformity of magnetic field coupling, and improve the reliability of Barkhausen signal acquisition.

[0023] This invention has strong anti-interference capabilities. The induction coil is covered with an electromagnetic shielding layer, and combined with a multi-stage filtering circuit, it effectively suppresses noise interference and improves the signal-to-noise ratio.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a three-dimensional view of the annular variable diameter probe based on the Barkhausen principle of this utility model.

[0026] Figure 2 This is a front view of the annular variable diameter probe based on the Barkhausen principle of this utility model.

[0027] Figure 3 This is a top view of the annular variable diameter probe based on the Barkhausen principle of this utility model. Detailed Implementation

[0028] It is readily understood that, based on the technical solution of this utility model, various embodiments of this utility model can be conceived by those skilled in the art without altering its essential spirit. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of this utility model or as a limitation or restriction on its technical solution. Rather, these embodiments are provided to enable those skilled in the art to gain a more thorough understanding of this utility model. Preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings, which constitute a part of this application and, together with the embodiments of this utility model, serve to illustrate the innovative concept of this invention.

[0029] Example 1

[0030] Combination Figure 1 The ring-shaped variable diameter probe based on the Barkhausen principle includes an induction coil 1, a probe body 2, an adjustment rod assembly 3, and a housing 4.

[0031] The annular probe body 2 is made of a soft magnetic material with high permeability, such as a permalloy sheet, which possesses both high permeability and good flexibility. The permalloy sheet is precision stamped into an initial annular shape, with the outer diameter initially set to a relatively large size to allow for subsequent inner diameter adjustments. During processing, the flatness and roundness errors of the annular shape are strictly controlled to ensure they are within ±0.2 mm.

[0032] The toroidal soft magnetic material was heat-treated to optimize its magnetic properties and improve its sensitivity to the Barkhausen signal. The heat treatment process parameters were determined through multiple experiments, including holding the material at a specific temperature for a certain time followed by slow cooling.

[0033] The inner wall of the ring probe body 2 is provided with an induction coil 1 for sensing Barkhausen signals. The induction coil 1 is wound with 0.1mm high-purity copper wire. During the winding process, the uniformity and tightness of the coil are maintained, and the spacing between adjacent turns is controlled at a specific distance. After the winding is completed, a silver-plated copper foil electromagnetic shielding layer is wrapped around the outside of the induction coil 1 and insulation treatment is performed. The insulation performance and stability of the coil can be improved by impregnation with insulating varnish.

[0034] An adjustment rod assembly 3 is provided on the outer wall of the annular probe body 2. One end of the adjustment rod assembly 3, which is connected to the annular probe body 2, extends into the inner wall of the probe body 2 and is connected to the induction coil 1.

[0035] Meanwhile, there are multiple sets of induction coil 1 and multiple sets of adjustment rod assembly 3, with induction coil 1 and adjustment rod assembly 3 being arranged correspondingly.

[0036] The adjusting rod assembly 3 is connected to the motor transmission device 7;

[0037] The high-strength alloy adjusting rod assembly 3 is connected to the annular probe body 2. To facilitate the flexible rotation of the annular probe body 2, one end of the adjusting rod can be connected to the annular probe body 2 via a high-precision hinge. The hinge's rotating shaft is made of stainless steel and finely ground to ensure flexible rotation without loosening. The other end of the adjusting rod is connected to the motor transmission device 7, and a coupling is used between the adjusting rod and the motor transmission device 7 to ensure the accuracy and stability of power transmission.

[0038] After installation, calibrate the initial position of the adjusting rods to ensure that all adjusting rods are at the same starting length, with the error controlled within 0.1mm.

[0039] The motor transmission device 7 includes a lead screw and nut pair and a stepper motor. The adjusting rod assembly 3 is connected to the lead screw and nut pair, and the lead screw and nut pair is connected to the output end of the stepper motor.

[0040] In addition, the variable diameter probe of this solution also includes a signal transmission and processing unit 5, which is connected to the induction coil 1 and includes a signal acquisition circuit, a low-noise operational amplifier (such as AD8628), a multi-stage active filter and a digital signal processor (such as TMS320F28335 chip) to transmit, filter and amplify the induced Barkhausen signal.

[0041] The outer shell 4 is made of a low-permeability engineering plastic such as polycarbonate, and its surface is provided with heat dissipation holes and an anti-static coating. In this embodiment, the outer shell 4 is designed in a cylindrical shape, with an inner diameter slightly larger than the maximum outer diameter of the annular probe body and the adjustment mechanism, so as to facilitate smooth installation. The shell thickness is designed to be 25mm, providing sufficient strength and stability. It is designed with a segmented structure for easy installation.

[0042] The inner wall of the outer shell 4 is provided with an elastic fixing unit 6, which clamps the main pipe by its own elasticity, so that the center line of the pipe coincides with the center line of the outer shell. The inner wall of the outer shell 4 is provided with multiple sets of support frames. In addition, in order to facilitate the movement of the measuring device on the pipe, the surface of the internal elastic fixing unit 6 is designed with rollers to facilitate rolling on the pipe surface.

[0043] This solution, through the cooperation of the soft magnetic probe body, the adjusting rod assembly 3, and the motor transmission device 7, enables the variable diameter probe to be applicable to the surfaces of workpieces with different curvatures and diameters, and is suitable for the detection of complex-shaped ferromagnetic materials. At the same time, the high-resolution adjusting rod ensures the accuracy of the probe's inner diameter adjustment, enhances the uniformity of magnetic field coupling, and improves the reliability of Barkhausen signal acquisition.

[0044] The above embodiments illustrate and describe the basic principles and main features of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A ring variable diameter probe based on the Barkhausen principle, characterized in that, It comprises an induction coil (1), a probe body (2), an adjusting rod assembly (3) and a shell (4); The annular probe body (2) is made of soft magnetic material with high magnetic permeability, and the inner wall of the annular probe body (2) is provided with a wound induction coil (1) for sensing the Barkhausen signal; The outer wall of the annular probe body (2) is provided with an adjusting rod assembly (3), one end of which is connected with the annular probe body (2) and extends into the inner wall of the probe body (2) and is connected with the induction coil (1); The outer side of the annular probe body (2) is provided with a shell (4), which wraps the annular probe body (2) and the adjusting rod assembly (3).

2. A ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1, characterized in that The induction coil (1) has multiple groups, and the adjusting rod assembly (3) has multiple groups, and the induction coil (1) and the adjusting rod assembly (3) are correspondingly arranged.

3. A ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1 or 2, characterized in that The adjusting rod assembly (3) is connected with the motor transmission device (7); The motor transmission device (7) comprises a screw nut pair and a stepping motor, the adjusting rod assembly (3) is connected with the screw nut pair, and the output end of the screw nut pair is connected with the stepping motor.

4. A ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1 or 2, characterized in that The variable diameter probe further comprises a signal transmission and processing unit (5); The signal transmission and processing unit (5) is connected with the induction coil (1) and comprises a low-noise operational amplifier, a multi-stage active filter and a digital signal processor, which transmits, filters and amplifies the sensed Barkhausen signal.

5. The ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1, characterized in that The inner wall of the shell (4) is provided with an elastic fixing unit (6).

6. The ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1, characterized in that The inner wall of the shell (4) is provided with multiple support skeletons.

7. The ring-shaped variable diameter probe based on the Barkhausen principle according to claim 1, characterized in that The induction coil (1) is wound with high-purity copper wire and wrapped with a silver-plated copper foil electromagnetic shielding layer outside.

8. The ring-shaped variable diameter probe based on the Barkhausen principle of claim 1, wherein, The shell (4) is made of low magnetic permeability engineering plastic, and the surface is provided with heat dissipation holes and an anti-static coating.

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