Eddy current sensor

Abstract

The utility model provides an eddy current sensor, which comprises an eddy current sensor, the eddy current sensor comprises a mounting seat and a sensor probe, the sensor probe is mounted on the mounting seat, the sensor probe is positioned in a protective cover, the bottom end of the protective cover is mounted on the mounting seat, and a top seat is mounted at the top end of the protective cover. And the through hole in the center of the top seat is opposite to the through hole in the top end of the protective cover.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor devices, in particular to an eddy current sensor. Background Art

[0002] Eddy-current sensors are based on an extension of electromagnetic induction, namely the eddy current effect. When the sensor system is powered on, a high-frequency signal or current is generated in the preamplifier. This signal is transmitted via a cable to the probe's head coil, generating an alternating magnetic field around the probe. When a metal conductor approaches this alternating magnetic field, eddy currents are generated on the conductor's surface, simultaneously generating an alternating magnetic field opposite to the original magnetic field. Due to the influence of the reaction magnetic field, the amplitude and phase of the high-frequency current in the probe's head coil are changed, thereby changing the coil's effective impedance.

[0003] Patent number CN105823493A discloses a sensitivity-enhanced eddy-current sensor, comprising a coil assembly, a circuit board, a transmission cable, and a connector connected in sequence. This invention utilizes a T-shaped magnetic core with high resistivity. The large end of the T-shaped core enhances the reflection of the alternating electromagnetic field, increasing the coupling between the sensor and the object being measured, thereby achieving higher sensitivity and a longer sensing distance. When implementing this solution, the protective shield cannot meet the testing requirements of the eddy-current sensor simply by compression and extension. Therefore, an eddy-current sensor is proposed to address this issue. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the utility model provides an eddy current sensor, which has the advantages of a protective cover and can effectively meet the testing requirements of the eddy current sensor.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: an eddy current sensor, comprising a mounting base and a sensor probe, the sensor probe being mounted on the mounting base, the sensor probe being located in a protective cover, the bottom end of the protective cover being mounted on the mounting base, and a top base being mounted on the top end, the through hole in the center of the top base being arranged opposite to the through hole at the top end of the protective cover.

[0006] Furthermore, it includes a shield, wherein the top and bottom ends of the shield are respectively provided with through holes, and the shield is a flexible shield.

[0007] Furthermore, the protective cover is a natural rubber cover.

[0008] Furthermore, a stainless steel gasket is embedded in the top through hole of the shield.

[0009] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0010] 1. The eddy current sensor is equipped with a natural rubber cover, which can effectively isolate the interference of metal dust or metal chips without affecting the accuracy test requirements of the eddy current sensor.

[0011] 2. The protective cover of the eddy current sensor is designed to be spherical. The distance between the top seat and the eddy current sensor can be compressed downward or stretched upward, which can effectively meet the test of the eddy current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the structure of the utility model;

[0013] Figure 2 is a cross-sectional view of the natural rubber cover of the present invention;

[0014] FIG3 is an exploded view of the structure assembly of the present invention.

[0015] In the figure: 2, sensor probe; 1, mounting base; 4, fastener a; 3, shield; 7, mounting base cover; 8, fastener b; 5, top base; 6, fastener c; 31, stainless steel ring gasket a; 32, stainless steel ring gasket b. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] Please refer to Figures 1-3. An eddy current sensor in this embodiment includes a mounting base and a sensor probe. The sensor probe is installed on the mounting base, the sensor probe is located in the protective cover, the bottom end of the protective cover is installed on the mounting base, and a top base is installed on the top end. The through hole in the center of the top base is arranged opposite to the through hole at the top end of the protective cover.

[0018] In this application, the sensor probe 2 is installed in the central groove of the mounting base 1. The mounting base 1 is used to fix and support the sensor probe 2. The mounting base 1 is a fixing part. The mounting base 1 includes a mounting base cover 7. The mounting base cover 7 is fixed to the mounting base 1 by a fastener b8. The mounting base cover 7 supports the mounting base 1. At the same time, a through hole is provided on the mounting base cover 7 for connecting with other components.

[0019] The shield 3 is secured to the mounting base 1 via fasteners a4. A movable top base 5 is provided above the shield, which has through-holes for connecting to other components. The eddy current sensor and its shield have a simple structure, with components connected by fasteners. This facilitates fabrication and assembly, and the sensor is easily disassembled, repaired, and installed.

[0020] Furthermore, through holes are respectively provided at the top and bottom ends of the shield 3 , and the shield 3 is a flexible shield.

[0021] In this application, shield 3 is positioned outside sensor probe 2, providing the advantages of a protective shield. It effectively isolates metal dust or shavings from interfering with the eddy current sensor's distance measurement, thereby improving test accuracy. Shield 3 also features a through-hole at its bottom to facilitate insertion of sensor probe 2, and a through-hole at its top to facilitate measurement of displacement data, such as other metal objects. Shield 3 is flexible, allowing distance to be varied through stretching and compression to complete product testing.

[0022] Furthermore, the protective cover 3 is a natural rubber cover, and the protective cover 3 is configured to be spherical.

[0023] In this application, the shield 3 is made of natural rubber and is set to a spherical shape. When the product needs to be tested, the distance between the top seat 5 and the eddy current sensor can be changed by compressing or stretching the shield 3 downward, thereby effectively meeting the test requirements of the eddy current sensor for distance.

[0024] Furthermore, a stainless steel gasket is embedded in the top through hole of the shield 3 .

[0025] In this application, the shield 3 is embedded with stainless steel annular gaskets a31 and b32. In this embodiment, the stainless steel annular gaskets on both sides are 3 mm thick and 1 mm thick, respectively. The top seat 5 is fixed to the embedded stainless steel annular gaskets on the shield 3 via fasteners c6, thereby connecting to the shield 3 and ensuring a tight and secure installation.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An eddy current sensor, comprising a mounting base (1) and a sensor probe (2), characterized in that: The sensor probe (2) is mounted on the mounting seat (1), a protective cover (3) is provided outside the sensor probe (2), the bottom end of the protective cover (3) is mounted on the mounting seat (1), and a top seat (5) with a detection component is installed on the top end, a through hole in the center of the top seat (5) is arranged opposite to the through hole at the top end of the protective cover (3), the protective cover (3) is a natural rubber cover, and the protective cover (3) is arranged in a spherical shape.

2. The eddy current sensor according to claim 1, wherein: The top and bottom ends of the shield (3) are respectively provided with through holes, and the shield (3) is a flexible shield.

3. The eddy current sensor according to claim 1, wherein: A stainless steel gasket is embedded in the top through hole of the shield (3).

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