Eddy current sensor

Abstract

The utility model discloses an eddy current sensor, which relates to the technical field of eddy current sensors and comprises a front-end device body, a connector is mounted on the inner wall of the front-end device body, a high-frequency connector matched with the connector is arranged outside the front-end device body, and a high-frequency cable is electrically connected to the inner wall of the high-frequency connector. The outer surface of the high-frequency cable is fixedly connected with a screw rod, the inner wall of the screw rod is provided with a detection probe electrically connected with the high-frequency cable, and the outer surface of the high-frequency cable is fixedly connected with an armor layer and a steel belt which are used for protecting the high-frequency cable from being damaged by external mechanical force. According to the utility model, the front-end device of the eddy current sensor is connected with the detection probe by using the high-frequency cable in a threaded connection manner, so that the connection between the front-end device and the detection probe is prevented from loosening, and meanwhile, the high-frequency cable is armored and protected, so that the high-frequency cable is prevented from being damaged by external mechanical force; and thus, normal transmission of detection data is ensured.

Description

Technical Field

[0001] This utility model relates to the field of eddy current sensor technology, specifically an eddy current sensor. Background Technology

[0002] Eddy current sensors are electrical sensors based on the principle of eddy current effect. Eddy current sensors can measure various physical quantities of objects with metal conductors on their surfaces in a non-contact manner, such as displacement, vibration, thickness, rotational speed, stress, and hardness. These sensors can also be used for non-destructive testing.

[0003] Existing eddy current sensors connect the preamplifier and probe via wires, mostly using a plug-in connection. However, plug-in connections are prone to loosening, and the wires may break due to bending under harsh environmental conditions, thus affecting the normal transmission of detection data. To address these issues, we provide an eddy current sensor. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an eddy current sensor.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an eddy current sensor, comprising a preamplifier body, a connector installed on the inner wall of the preamplifier body, a high-frequency connector adapted to the connector on the outer side of the preamplifier body, a high-frequency cable electrically connected to the inner wall of the high-frequency connector, a screw fixedly connected to the outer surface of the high-frequency cable, a detection probe electrically connected to the high-frequency cable installed on the inner wall of the screw, and an armor layer and steel strip fixedly connected to the outer surface of the high-frequency cable to protect the high-frequency cable from damage by external mechanical forces.

[0006] Furthermore, the outer surface of the screw is threaded with two nuts, and a limiting block is sleeved on the outer surface of the screw, with the limiting block located between the two nuts. The limiting block can be clamped and fixed by the two nuts threaded to the outer surface of the screw, thereby limiting and fixing the position of the detection probe and allowing for fine adjustment of the position.

[0007] Furthermore, the outer surface of the screw is provided with a square wrench plane for easy adjustment of the position of the limiting block. By using the square wrench plane on the outer surface of the screw, the nut can be rotated using a wrench, thereby adjusting the position of the limiting block.

[0008] Furthermore, a nameplate for recording the manufacturer of the eddy current sensor and its technical data under rated operating conditions is fixedly connected to one side of the preamplifier body. By setting the nameplate, the manufacturer of the eddy current sensor and its technical data under rated operating conditions can be recorded.

[0009] Furthermore, the inner wall of the preamplifier body is slidably connected with a guide rail for adjusting the installation position of the preamplifier body. By setting the guide rail, the preamplifier body can be supported, fixed and guided to move, thereby improving the convenience and practicality of use.

[0010] Furthermore, the high-frequency cable is sealed with rubber caps at both ends of the connection points with the high-frequency connector and the detection probe. By sealing both ends of the high-frequency cable with rubber caps, external moisture can be prevented from affecting the normal transmission of detection data.

[0011] Compared with existing technologies, this eddy current sensor has the following advantages:

[0012] 1. This utility model uses a high-frequency cable to connect the preamplifier of the eddy current sensor to the detection probe, and uses a threaded connection to avoid loosening of the connection between the two. At the same time, the high-frequency cable is armored to protect it from damage by external mechanical forces, thereby ensuring the normal transmission of detection data.

[0013] 2. This utility model can install and fix the detection probe by setting a nut and a limiting block, and the installation position can be finely adjusted. By setting a wrench plane, the user can be assisted in rotating the nut to adjust the position of the limiting block. By setting a nameplate, the manufacturer of the eddy current sensor and the technical data under rated working conditions can be recorded. By setting a guide rail, the preamplifier body can be supported, fixed and guided to move. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of a partial structure of the present invention. Figure 1 ;

[0016] Figure 3 This is a schematic diagram of a partial structure of the present invention. Figure 2 ;

[0017] Figure 4 This is a partial structural cross-sectional view of the present invention;

[0018] Figure 5 This is a schematic diagram of the connection between the high-frequency cable and the steel strip structure of this utility model.

[0019] In the diagram: 1. Preamplifier body; 2. Connector; 3. High-frequency connector; 4. High-frequency cable; 5. Screw; 6. Detection probe; 7. Armor layer; 8. Steel strip; 9. Nut; 10. Limit block; 11. Wrench plane; 12. Nameplate; 13. Guide rail. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] As described in the background section, the preamplifier and probe of existing eddy current sensors are connected by wires, and the connection method is mostly plug-in. However, plug-in connection is prone to loosening, and the wires may break due to bending when used in harsh environmental conditions, thus affecting the normal transmission of detection data. Therefore, this embodiment provides an eddy current sensor.

[0022] See Figures 1 to 5 This embodiment proposes an eddy current sensor, including a preamplifier body 1. A connector 2 is installed on the inner wall of the preamplifier body 1. A high-frequency connector 3 adapted to the connector 2 is provided on the outside of the preamplifier body 1. A high-frequency cable 4 is electrically connected to the inner wall of the high-frequency connector 3. A screw 5 is fixedly connected to the outer surface of the high-frequency cable 4. A detection probe 6 electrically connected to the high-frequency cable 4 is installed on the inner wall of the screw 5.

[0023] The high-frequency connector 3 can be screwed onto the connector head 2 to connect the preamplifier body 1 and the detection probe 6, thereby enabling non-contact measurement of various physical quantities of objects whose surfaces are metallic conductors, such as displacement, vibration, thickness, rotational speed, stress, and hardness. Furthermore, the screw 5 can improve the stability of the connection between the high-frequency cable 4 and the detection probe 6, thus preventing the connection from loosening when subjected to minor external force.

[0024] Rubber caps are used at the connection points of the high-frequency cable 4 with the high-frequency connector 3 and the detection probe 6. By sealing both ends of the high-frequency cable 4 with rubber caps, external moisture can be prevented from affecting the normal transmission of detection data.

[0025] The inner wall of the preamplifier body 1 is slidably connected to a guide rail 13 for adjusting the installation position of the preamplifier body 1. By setting the guide rail 13, the preamplifier body 1 can be supported, fixed and guided to move, thereby improving the convenience and practicality of use.

[0026] The outer surface of the screw 5 is threaded with two nuts 9. A limiting block 10 is fitted on the outer surface of the screw 5 and is located between the two nuts 9. The limiting block 10 can be clamped and fixed by the two nuts 9 threaded to the outer surface of the screw 5, thereby limiting and fixing the position of the detection probe 6 and allowing for fine adjustment of the position.

[0027] The outer surface of the screw 5 is provided with a square wrench plane 11 for easy adjustment of the position of the limit block 10. By using the square wrench plane 11 on the outer surface of the screw 5, the nut 9 can be rotated by the wrench, thereby adjusting the position of the limit block 10.

[0028] The outer surface of the high-frequency cable 4 is fixedly connected with an armor layer 7 and a steel strip 8 to protect the high-frequency cable 4 from damage by external mechanical forces. By fixing the armor layer 7 and the steel strip 8 to the outer surface of the high-frequency cable 4, the high-frequency cable 4 can be armored and protected, thereby preventing the high-frequency cable 4 from damage by external mechanical forces and ensuring the normal transmission of detection data.

[0029] A nameplate 12 for recording the manufacturer of the eddy current sensor and its technical data under rated operating conditions is fixedly connected to one side of the preamplifier body 1. By setting the nameplate 12, the manufacturer of the eddy current sensor and its technical data under rated operating conditions can be recorded.

[0030] Eddy current sensors are characterized by high reliability, high sensitivity, strong anti-interference ability, non-contact measurement, fast response speed, and immunity to media such as oil and water. They are widely used in industries such as power, petroleum, chemical, and metallurgy, as well as some research institutions. They can be used for online monitoring and protection of radial vibration, axial displacement, key phase, shaft speed, expansion difference, eccentricity, rotor dynamics research, and part dimension inspection of large rotating machinery shafts such as steam turbines, water turbines, blowers, compressors, air separation units, gearboxes, and large cooling pumps.

[0031] The components in the accompanying drawings of this utility model are for styling reference only and are not specific dimensional standards. The specific dimensions are determined according to the actual production requirements, and the materials of each component can be replaced accordingly based on actual needs.

[0032] All electrical components in this invention are commercially available, conventional equipment known to those skilled in the art. Models can be selected or customized according to actual needs. The setting method, installation method, and electrical connection method can be easily understood by those skilled in the art by following the instructions for use, and will not be described in detail here.

[0033] Working principle: When using the eddy current sensor, the high-frequency connector 3 can be screwed onto the outer surface of the connector 2 to connect the preamplifier body 1 and the detection probe 6. The preamplifier body 1 can generate a medium-to-high frequency oscillating current, which flows into the detection probe 6 through the high-frequency cable 4, thereby generating an alternating magnetic field in the coil at the head of the detection probe 6. When a metal specimen approaches this magnetic field, an induced current, i.e., an eddy current, is generated on the metal surface. The alternating magnetic field generated by this eddy current changes the amplitude and phase of the high-frequency current in the coil at the head of the detection probe 6. After the high-frequency current is received and processed by the preamplifier body 1, an electrical signal reflecting the distance between the eddy current sensor and the specimen can be output. The screw 5 can improve the stability of the connection between the high-frequency cable 4 and the detection probe 6, thereby preventing the connection from loosening when subjected to small external forces. At the same time, the armor layer 7 and steel strip 8 fixed to the outer surface of the high-frequency cable 4 can armor and protect the high-frequency cable 4, thereby preventing damage from external mechanical forces and ensuring the normal transmission of detection data.

Claims

1. An eddy current sensor comprising a preamplifier body (1), characterized in that: The inner wall of the preamplifier body (1) is equipped with a connector (2), and the outside of the preamplifier body (1) is provided with a high-frequency connector (3) that is compatible with the connector (2). The inner wall of the high-frequency connector (3) is electrically connected to a high-frequency cable (4). The outer surface of the high-frequency cable (4) is fixedly connected to a screw (5). The inner wall of the screw (5) is equipped with a detection probe (6) that is electrically connected to the high-frequency cable (4). The outer surface of the high-frequency cable (4) is fixedly connected to an armor layer (7) and a steel strip (8) for protecting the high-frequency cable (4) from damage by external mechanical forces.

2. An eddy current sensor according to claim 1, characterised in that: The outer surface of the screw (5) is threaded with two nuts (9), and a limiting block (10) is sleeved on the outer surface of the screw (5), with the limiting block (10) located between the two nuts (9).

3. An eddy current sensor according to claim 2, characterised in that: The outer surface of the screw (5) is provided with a square wrench plane (11) for easy adjustment of the position of the limiting block (10).

4. An eddy current sensor according to claim 1, wherein: A nameplate (12) for recording the manufacturer of the eddy current sensor and its technical data under rated operating conditions is fixedly connected to one side of the preamplifier body (1).

5. An eddy current sensor according to claim 1, wherein: The inner wall of the preamplifier body (1) is slidably connected to a guide rail (13) for adjusting the installation position of the preamplifier body (1).

6. An eddy current sensor according to claim 1, wherein: The high-frequency cable (4) is sealed with rubber caps at the connection points with the high-frequency connector (3) and the detection probe (6).

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