Special-shaped alternating current electromagnetic field detection probe

Abstract

The invention belongs to the technical field of nondestructive testing, and discloses a special-shaped alternating current electromagnetic field detection probe, which comprises a 16-core plug connecting signal amplification circuit module, an excitation module and a tunnel magnetic resistance (TMR) sensor, the signal amplification circuit module is connected with the TMR sensor; the excitation module is connected with the signal amplification circuit module; the excitation module sends an excitation signal to a to-be-tested workpiece, the to-be-tested workpiece provides a feedback signal to the TMR sensor, the TMR sensor sends the feedback signal to the amplification circuit module for amplification, and the amplified feedback signal is transmitted to the computer through the 16-core plug. According to the invention, the sensitivity and precision of electromagnetic field detection are improved, the applicability and flexibility of the probe are enhanced, and the heat insulation medium arranged in the probe shell can effectively protect the working environment of electronic components. According to the invention, powerful technical support is provided for accurate detection in a complex electromagnetic environment.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing and relates to a special-shaped alternating current electromagnetic field detection probe. Background Art

[0002] AC electromagnetic field detection is a non-destructive testing technology that has emerged in recent years. It is mainly used to detect cracks or defects on the surface of magnetic conductive materials. The working principle of AC electromagnetic field detection follows the principle of electromagnetic induction. An alternating magnetic field is induced on the surface of the component being tested. Cracks and other defects on the surface of the component will affect the magnetic field distribution, causing the magnetic field distribution to be distorted. The magnetic field distortion signal is measured to obtain defect information.

[0003] With the continuous improvement of safety awareness and testing requirements, when conducting online testing of thick-walled welds, the shape of conventional AC electromagnetic field detection probes is affected by the weld groove and cannot enter the narrow testing space. At the same time, during the online testing process, since the welding process requires that a high interlayer temperature be maintained during the welding process, the use of traditional probes will have an adverse effect on the test results due to excessively high temperatures. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the detection result may be affected by the over-high temperature of the traditional probe, and to provide a special-shaped AC electromagnetic field detection probe.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A special-shaped AC electromagnetic field detection probe, comprising: a probe housing, a 16-core plug, a signal amplification circuit module, an excitation module and a tunnel magnetoresistance TMR sensor;

[0007] The 16-pin plug connects the signal amplifying circuit module, the excitation module and the tunnel magnetoresistance TMR sensor; the signal amplifying circuit module is connected to the tunnel magnetoresistance TMR sensor; the 16-pin plug is externally connected to a computer; the excitation module is connected to the signal amplifying circuit module; the excitation module sends an excitation signal to the workpiece to be measured, the workpiece to be measured provides a feedback signal to the tunnel magnetoresistance TMR sensor, the tunnel magnetoresistance TMR sensor sends the feedback signal to the amplifying circuit module for amplification, and the amplified feedback signal is transmitted to the computer through the 16-pin plug; the 16-pin plug, the signal amplifying circuit module, the excitation module and the tunnel magnetoresistance TMR sensor are all fixed on the probe housing.

[0008] A further improvement of the present invention is:

[0009] Furthermore, the probe housing includes an upper cover plate, an intermediate shell and a side cover plate; the upper cover plate is arranged on the intermediate shell; a groove plate is arranged below the intermediate shell; the groove plate is used to place the excitation module and the tunnel magnetoresistance TMR sensor; and the side cover plate is covered on the groove plate.

[0010] Furthermore, the upper cover plate includes a through hole and a first bolt hole, and the intermediate shell is provided with a second bolt hole; the upper cover plate is arranged on the intermediate shell by bolts passing through the first bolt hole and the second bolt hole; and the 16-core plug is arranged at the through hole.

[0011] Furthermore, the middle shell is externally connected to a mechanical arm; driven by the mechanical arm, the special-shaped AC electromagnetic field detection probe moves.

[0012] Furthermore, the intermediate shell is provided with a main positioning hole and a sub-positioning hole; the intermediate shell is connected to the mechanical arm through a positioning connection device passing through the main positioning hole and the sub-positioning hole.

[0013] Furthermore, a heat-insulating medium is provided inside the probe housing to protect the 16-core plug, the signal amplification circuit module, the excitation module and the tunnel magnetoresistance TMR sensor from being damaged.

[0014] Furthermore, the signal amplifying circuit module is arranged in the bottom groove of the intermediate shell; the bottom groove is located at one end of the groove plate.

[0015] Furthermore, the tunnel magnetoresistive TMR sensor is arranged in the magnetic sensor array fixing groove, the magnetic sensor array fixing groove is located at the other end of the groove plate, and the groove plate is connected to the side cover plate through the bolt hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention sends an excitation signal to the workpiece to be measured through an excitation module, and the workpiece to be measured provides a feedback signal to the tunnel magnetoresistance TMR sensor, and the tunnel magnetoresistance TMR sensor sends the feedback signal to the amplification circuit module for amplification, and the amplified feedback signal is transmitted to the computer through a 16-core plug. The present invention improves the sensitivity and accuracy of electromagnetic field detection, enhances the applicability and flexibility of the probe, and at the same time, the heat-insulating medium arranged inside the probe housing can effectively protect the working environment of electronic components. The present invention provides strong technical support for accurate detection in complex electromagnetic environments and meets the needs of diversified application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a working diagram of a special-shaped AC electromagnetic field detection probe;

[0020] Figure 2 This is a schematic diagram of the structure of a special-shaped AC electromagnetic field detection probe;

[0021] Figure 3 This is a schematic diagram of the internal circuit of the special-shaped AC electromagnetic field detection probe;

[0022] Figure 4 It is a schematic diagram of the upper cover structure;

[0023] Figure 5 It is a schematic diagram of the structure of the intermediate shell;

[0024] Figure 6 It is a schematic diagram of the side cover structure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0032] See also Figures 1 to 6 The present invention discloses a special-shaped AC electromagnetic field detection probe, comprising: a probe housing 10, a 16-core plug 20, a signal amplification circuit module 30, an excitation module 40 and a tunnel magnetoresistance TMR sensor 50;

[0033] The 16-core plug 20 connects the signal amplifying circuit module 30, the excitation module 40 and the tunnel magnetoresistance TMR sensor 50; the signal amplifying circuit module 30 is connected to the tunnel magnetoresistance TMR sensor 50; the 16-core plug 20 is externally connected to a computer; the excitation module 40 is connected to the signal amplifying circuit module 30; the excitation module 40 sends an excitation signal to the workpiece to be measured, the workpiece to be measured provides a feedback signal to the tunnel magnetoresistance TMR sensor 50, the tunnel magnetoresistance TMR sensor 50 sends the feedback signal to the amplifying circuit module 30 for amplification, and the amplified feedback signal is transmitted to the computer through the 16-core plug 20.

[0034] The 16-core plug 20 , the signal amplifying circuit module 30 , the excitation module 40 and the tunnel magnetoresistive TMR sensor 50 are all fixed on the probe housing 10 .

[0035] The probe housing 10 includes an upper cover plate 101, an intermediate housing 102 and a side cover plate 103; the upper cover plate 101 is arranged on the intermediate housing 20; a groove plate 1027 is arranged below the intermediate housing 102; the groove plate 1027 is used to place the excitation module 40 and the tunnel magnetoresistance TMR sensor 50; the side cover plate 103 covers the groove plate 1027. A through hole 1031 is arranged on the side cover plate 103, and a through hole 1025 is arranged on the groove plate 1027. When the bolt passes through the through hole 1031 and the through hole 1025, the side cover plate 103 is connected to the groove plate 1027.

[0036] The upper cover plate 101 includes a through hole 1012 and a first bolt hole 1011 , and the intermediate housing 102 is provided with a second bolt hole 1021 ; the upper cover plate 101 is arranged on the intermediate housing 102 by bolts passing through the first bolt hole 1011 and the second bolt hole 1021 ; the 16-pin plug 20 passes through the through hole 1012 .

[0037] The intermediate housing 102 is connected to a mechanical arm; driven by the mechanical arm, the special-shaped AC electromagnetic field detection probe moves. The intermediate housing 102 is provided with a main positioning hole 1022 and a sub-positioning hole 1023; the intermediate housing 102 is connected to the mechanical arm through a positioning connection device passing through the main positioning hole 1022 and the sub-positioning hole 1023.

[0038] A heat insulating medium 60 is disposed inside the probe housing 10 to protect the 16-core plug 20 , the signal amplifying circuit module 30 , the excitation module 40 and the tunnel magnetoresistive TMR sensor 50 from being damaged.

[0039] The signal amplification circuit module 30 is arranged in the bottom groove 1024 of the intermediate shell 102; the bottom groove 1024 is located at one end of the groove 1027; the tunnel magnetoresistive TMR sensor 50 is arranged in the magnetic sensor array fixing groove 1026, and the magnetic sensor array fixing groove 1026 is located at the other end of the groove plate 1027, and the groove plate 1027 is connected to the side cover plate 103 through the bolt hole 1025.

[0040] In order to prevent the internal coil and sensor from being seriously heated, aerogel is selected as the internal heat insulation medium. Polyetheretherketone resin material is selected as the probe shell material to complete the production of high-temperature probes, meet the requirements of interlayer high-temperature detection, overcome the influence of general probes on internal components under high temperature conditions, and ensure the stability of detection.

[0041] The working principle of a special-shaped AC electromagnetic field detection probe is:

[0042] Driven by the mechanical arm, the tunnel magnetoresistance TMR sensor 50 is in motion, the excitation module 40 sends an excitation signal to the workpiece to be measured, the workpiece to be measured provides a feedback signal to the tunnel magnetoresistance TMR sensor 50, the tunnel magnetoresistance TMR sensor 50 sends the feedback signal to the amplification circuit module 30 for amplification, and the amplified feedback signal is transmitted to the computer through the 16-core plug 20. At the same time, aerogel is used as the internal insulation medium, and polyetheretherketone resin material is selected as the probe shell material to complete the production of the high-temperature probe.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special-shaped AC electromagnetic field detection probe, characterized in that: include: A probe housing (10), a 16-core plug (20), a signal amplification circuit module (30), an excitation module (40) and a tunnel magnetoresistance (TMR) sensor (50); The 16-core plug (20) is connected to a signal amplifying circuit module (30), an excitation module (40) and a tunnel magnetoresistance TMR sensor (50); the signal amplifying circuit module (30) is connected to the tunnel magnetoresistance TMR sensor (50); the 16-core plug (20) is externally connected to a computer; the excitation module (40) is connected to the signal amplifying circuit module (30); the excitation module (40) sends an excitation signal to a workpiece to be tested, the workpiece to be tested provides a feedback signal to the tunnel magnetoresistance TMR sensor (50), the tunnel magnetoresistance TMR sensor (50) sends the feedback signal to the amplifying circuit module (30) for amplification, and the amplified feedback signal is transmitted to the computer via the 16-core plug (20); The 16-core plug (20), the signal amplification circuit module (30), the excitation module (40) and the tunnel magnetoresistive TMR sensor (50) are all fixed on the probe housing (10).

2. The special-shaped AC electromagnetic field detection probe according to claim 1, characterized in that: The probe housing (10) comprises an upper cover plate (101), an intermediate shell (102) and a side cover plate (103); the upper cover plate (101) is arranged on the intermediate shell (20); a groove plate (1027) is arranged below the intermediate shell (102); the groove plate (1027) is used to place an excitation module (40) and a tunnel magnetoresistive TMR sensor (50); and the side cover plate (103) covers the groove plate (1027).

3. The special-shaped AC electromagnetic field detection probe according to claim 2, characterized in that: The upper cover plate (101) comprises a through hole (1012) and a first bolt hole (1011), and the intermediate housing (102) is provided with a second bolt hole (1021); the upper cover plate (101) is arranged on the intermediate housing (102) by means of bolts passing through the first bolt hole (1011) and the second bolt hole (1021); and the 16-core plug (20) is arranged at the through hole (1012).

4. The special-shaped AC electromagnetic field detection probe according to claim 3, characterized in that: The intermediate housing (102) is externally connected to a mechanical arm; driven by the mechanical arm, the special-shaped AC electromagnetic field detection probe moves.

5. The special-shaped AC electromagnetic field detection probe according to claim 4, characterized in that: The intermediate housing (102) is provided with a main positioning hole (1022) and a sub-positioning hole (1023); the intermediate housing (102) is connected to the mechanical arm through a positioning connection device passing through the main positioning hole (1022) and the sub-positioning hole (1023).

6. The special-shaped AC electromagnetic field detection probe according to claim 5, characterized in that: A heat insulating medium (60) is arranged inside the probe housing (10) to protect the 16-core plug (20), the signal amplification circuit module (30), the excitation module (40) and the tunnel magnetoresistance TMR sensor (50) from damage.

7. The special-shaped AC electromagnetic field detection probe according to claim 6, characterized in that: The signal amplifying circuit module (30) is arranged in a bottom groove (1024) of the intermediate housing (102); the bottom groove (1024) is located at one end of the groove plate (1027).

8. The special-shaped AC electromagnetic field detection probe according to claim 7, characterized in that: The tunnel magnetoresistive (TMR) sensor (50) is arranged in a magnetic sensor array fixing groove (1026), the magnetic sensor array fixing groove (1026) is located at the other end of a groove plate (1027), and the groove plate (1027) is connected to the side cover plate (103) through a bolt hole (1025).

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