阅读说明：本技术 一种无方向性焊缝涡流检测探头及检测装置 (Non-directional welding seam eddy current detection probe and detection device ) 是由 李广凯 周庆祥 邱国云 邓鸿剑 曹峰 肖君武 傅晔 于秀娟 江华 于 2019-10-18 设计创作，主要内容包括：本发明涉及一种无方向性焊缝涡流检测探头及检测装置,检测探头包括激励单元、检测单元和外壳,所述激励单元和检测单元封装在外壳内,所述激励单元由磁轭和缠绕在磁轭上的激励线圈组成,所述检测单元由一个由绝缘材料制成的线圈骨架和至少两个安装在线圈骨架上的检测线圈组成,多个所述检测线圈沿所述线圈骨架的周向均匀排布且几何中心线重合。本发明有利于增强激励磁场,提高平面涡流场的强度与渗透深度,有效抑制提离效应及焊缝表面鱼鳞纹对检测信号的影响,对各种方向的焊缝裂纹检测具有较高的灵敏度及信噪比。(The invention relates to a non-directional welding seam eddy current detection probe and a detection device, wherein the detection probe comprises an excitation unit, a detection unit and a shell, the excitation unit and the detection unit are encapsulated in the shell, the excitation unit consists of a magnetic yoke and an excitation coil wound on the magnetic yoke, the detection unit consists of a coil framework made of insulating materials and at least two detection coils arranged on the coil framework, and the detection coils are uniformly distributed along the circumferential direction of the coil framework and are overlapped by geometric center lines. The invention is beneficial to enhancing the excitation magnetic field, improving the strength and the penetration depth of the plane eddy current field, effectively inhibiting the lift-off effect and the influence of the fish scale marks on the surface of the welding seam on the detection signal, and has higher sensitivity and signal-to-noise ratio on the detection of the welding seam cracks in various directions.)

1. A non-directional welding seam eddy current inspection probe is characterized in that: the detection device comprises an excitation unit, a detection unit and a shell, wherein the excitation unit and the detection unit are packaged in the shell, the excitation unit is composed of a magnetic yoke and excitation coils wound on the magnetic yoke, the detection unit is composed of a coil framework made of insulating materials and at least two detection coils installed on the coil framework, and the detection coils are uniformly distributed in the circumferential direction of the coil framework and coincide with the geometric center line.

2. The non-directional weld eddy current inspection probe of claim 1, wherein: the magnetic yoke is of a 'door' -shaped structure, the exciting coil is wound on a horizontal arm of the magnetic yoke, and the detection unit is installed inside the 'door' -shaped structure.

3. The non-directional weld eddy current inspection probe of claim 2, wherein: the normal of the excitation unit is collinear with the normal of the detection unit.

4. The non-directional weld eddy current inspection probe of claim 1, wherein: the two detection coils are installed on the coil framework in a mutually orthogonal mode, and the two detection coils are wound in the same direction and are connected in series and in a positive connection mode.

5. The non-directional weld eddy current inspection probe of claim 1, wherein: the coil framework is a cuboid or a sphere, and the detection coil is wound into a rectangular or circular structure.

6. The non-directional weld eddy current inspection probe according to claim 5, wherein: the detection coils are copper enameled wires, the wire diameter of each detection coil is 0.04-0.15mm, and each detection coil is wound by 50-180 turns.

7. The non-directional weld eddy current inspection probe according to claim 5, wherein: the area of the longitudinal section of the detection coil is larger than that of the longitudinal section of the coil framework.

8. The non-directional weld eddy current inspection probe of claim 7, wherein: the detection coil with a rectangular structure has a length × width × height dimension of W1mm × D1mm × H1mm, and the coil skeleton has a length × width × height dimension of W2mm × D2mm × H2mm, wherein W1 > W2, D1 ═ D2, and H1 ═ H2; or the diameter of the detection coil with a circular structure is R1mm, the diameter of the coil skeleton is R2mm, and R1 is more than R2.

9. The non-directional weld eddy current inspection probe of claim 1, wherein: the exciting coil is made of copper enameled wires, the wire diameter of the exciting coil is 0.06-0.2mm, and the exciting coil is wound by 100-360 turns.

10. The utility model provides a welding seam eddy current inspection detection device, includes test probe and signal generation and processing unit, its characterized in that: the detection probe adopts the non-directional welding seam eddy current detection probe according to any one of claims 1 to 9.

Technical Field

The invention relates to a welding seam detection device, in particular to a non-directional welding seam eddy current detection probe and a detection device.

Background

Metal welding parts are widely applied to various important fields, so that the detection of the welding seam part of a metal member is particularly important. The welding seam is an important bearing part of each key component, and fatigue cracks are easily generated near the welding seam area due to the influence of residual stress. Eddy current inspection can be used to inspect the surface and near-surface of conductive materials without removing surface coatings or paint layers, but conventional eddy current probes are susceptible to lift-off effects and are prone to generating noise signals. For workpieces with large scale pattern fluctuation and high detection sensitivity requirements on the surface of a metal welding seam, the existing welding seam eddy current detection probe is difficult to implement effective detection.

Disclosure of Invention

The invention mainly solves the technical problem of providing a non-directional welding seam eddy current detection probe which can effectively improve the detection efficiency, the detection sensitivity and the defect discovery capability, and also provides a detection device with the non-directional welding seam eddy current detection probe.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a non-directional welding seam eddy current inspection probe, includes excitation unit, detecting element and shell, excitation unit and detecting element encapsulation are in the shell, the excitation unit comprises yoke and the exciting coil of winding on the yoke, detecting element comprises a coil skeleton made by insulating material and at least two detection coils of installing on the coil skeleton, and is a plurality of detection coil is followed the circumference of coil skeleton is evenly arranged and the coincidence of geometric centre line.

Further, the magnetic yoke is of a door-shaped structure, the exciting coil is wound on a horizontal arm of the magnetic yoke, and the detection unit is installed inside the door-shaped structure.

Further, the normal of the excitation unit is collinear with the normal of the detection unit.

Furthermore, the two detection coils are installed on the coil framework in a mutually orthogonal mode, and the two detection coils are wound in the same direction and are connected in series and in a positive connection mode.

Further, the coil skeleton is a cuboid or a sphere, and the detection coil is wound into a rectangular or circular structure.

Furthermore, the detection coils are made of copper enameled wires, the wire diameter of each detection coil is 0.04-0.15mm, and each detection coil is wound by 50-180 turns.

Further, the area of the longitudinal section of the detection coil is larger than that of the longitudinal section of the coil framework.

Further, the detection coil of a rectangular structure has a length × width × height dimension of W1mm × D1mm × H1mm, and the length × width × height dimension of the bobbin is W2mm × D2mm × H2mm, where W1 > W2, D1 ═ D2, and H1 ═ H2; or the diameter of the detection coil with a circular structure is R1mm, the diameter of the coil skeleton is R2mm, and R1 is more than R2.

Furthermore, the exciting coil is made of copper enameled wires, the wire diameter of the exciting coil is 0.06-0.2mm, and the exciting coil is wound by 100 and 360 turns.

The other technical scheme of the invention is as follows:

a welding seam eddy current detection device comprises a detection probe and a signal generation and processing unit, wherein the detection probe adopts the non-directional welding seam eddy current detection probe according to any one of claims 1 to 9.

In summary, according to the non-directional weld seam eddy current detection probe and the detection device provided by the invention, the excitation magnetic field is enhanced by adding the magnetic yoke structure, the strength and the penetration depth of the planar eddy current field are improved by using the magnetic yoke structure, the lift-off effect and the influence of the weld seam surface fish scale on the detection signal are effectively inhibited, and meanwhile, the structure that the detection coils are uniformly distributed along the circumferential direction is adopted, so that the problem that the sensitivity of a single detection coil is only high in the direction of 45 degrees in the prior art is solved, and the probe and the detection device have higher sensitivity and signal-to-noise ratio for the detection of weld seam. The invention can improve the detection efficiency, the detection sensitivity and the defect discovery capability.

Drawings

FIG. 1 is a schematic structural diagram of a detecting probe according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second detection probe according to an embodiment of the present invention.

As shown in fig. 1 and 2, the excitation unit 1, the detection unit 2, the housing 3, the package port 3a, the detection portion 3b, the detection port 3c, the wire connection port 3d, the yoke 4, the excitation coil 5, the bobbin 6, and the detection coil 7.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: