An eddy current detection device

Abstract

The utility model relates to a kind of eddy current testing devices, the eddy current testing device includes bottom plate, detection component, slide bar and elastic piece;The detection component is provided with a plurality of detection coils on the side away from the bottom plate, a plurality of the detection coil is electrically connected with external power supply, to form detection eddy current on the rail surface;The number of the slide bar is two, one end of two the slide bar is respectively connected to the opposite sides of the bottom plate, and the end away from the bottom plate is slidably inserted with the detection component;The elastic piece is sleeved on the slide bar, between the bottom plate and the detection component;Wherein, between the slide bar and the detection component, there is gap in the direction parallel to the rail direction.The eddy current testing device can adapt to the unevenness of rail surface, always keep close contact with rail, improve the accuracy and continuity of detection.

Description

Technical Field

[0001] This utility model relates to the field of eddy current detection technology, and in particular to an eddy current detection device. Background Technology

[0002] Eddy current testing is a testing device that uses the principle of electromagnetic induction to detect surface defects in metal components. Its principle is to use an excitation coil to generate eddy currents in the metal component, and use a detection coil to measure the change in eddy currents, thereby obtaining relevant information about the defects in the metal component.

[0003] Currently, eddy current testing technology is widely used in various scenarios, such as in the rail transit field. In rail transit, as the core load-bearing component of train operation, the surface quality of the rail directly affects driving safety. To eliminate fatigue, wear, and defects on the rail surface, grinding is a common maintenance method. It is necessary to precisely control the grinding depth, removing the damaged layer without excessive grinding that weakens the rail strength.

[0004] Existing eddy current testing devices mostly employ a rigid, integral testing surface structure, which is difficult to conform to the dynamically changing, irregular surface of the rail. When the flatness of the rail surface changes during the grinding process, gap fluctuations easily occur between the testing device and the rail surface, resulting in loose contact between the testing device and the rail surface, and localized suspension. This causes distortion in the eddy current field distribution, distorting the grinding depth detection signal, making it impossible to accurately identify the amount of material removed during grinding, and failing to meet the stringent requirements for the surface quality of the rail after grinding. Utility Model Content

[0005] In view of this, the present invention provides an eddy current detection device to solve the problem that the device is not parallel to the rail during flow detection, resulting in poor surface adhesion and detection errors.

[0006] To achieve the above objectives, the technical solution of this utility model is to provide an eddy current detection device for detecting the surface of railway rails. The device includes: a base plate, a detection assembly, sliding rods, and an elastic element. Multiple detection coils are arranged on the side of the detection assembly away from the base plate. These detection coils are electrically connected to an external power source to form detection eddy currents on the rail surface. Two sliding rods are provided, with one end connected to opposite sides of the base plate and the other end slidably inserted into the detection assembly. The elastic element is sleeved on the sliding rods and located between the base plate and the detection assembly. A gap exists between the sliding rods and the detection assembly in a direction parallel to the rail.

[0007] Preferably, the detection component includes a first connecting plate and a second connecting plate that are connected to each other and form a gap. The first connecting plate is provided with a plug hole that penetrates through the first connecting plate. The end of the slide rod away from the base plate is slidably plugged into the plug hole, and there is a gap between the slide rod and the plug hole. The detection coil is disposed on the side of the second connecting plate away from the first connecting plate.

[0008] Preferably, both the first connecting plate and the base plate are provided with a first stepped groove, and the opposite sides of the elastic member are respectively located in the first stepped groove of the first connecting plate and the base plate.

[0009] Preferably, a connecting post is provided between the first connecting plate and the second connecting plate, and the two ends of the connecting post are respectively connected to the first connecting plate and the second connecting plate to realize the connection between the first connecting plate and the second connecting plate.

[0010] Preferably, both the first connecting plate and the second connecting plate are provided with a second stepped groove, and the opposite sides of the connecting column are respectively disposed in the second stepped grooves on the first connecting plate and the second connecting plate.

[0011] Preferably, there are multiple connecting posts, which are arranged sequentially and at equal intervals between the first connecting plate and the second connecting plate.

[0012] Preferably, the second connecting plate has a coil slot on the side away from the first connecting plate. The number of the coil slots is multiple and the same as the number of the detection coils. The multiple detection coils are respectively disposed in the multiple coil slots.

[0013] Preferably, the first connecting plate is provided with a plurality of wire holes, all of which penetrate the first connecting plate. The eddy current detection device further includes a plurality of connecting wires, which are respectively located in the plurality of wire holes, and there is a gap between each connecting wire and each wire hole. The plurality of detection coils are electrically connected to the plurality of connecting wires, and the plurality of connecting wires are electrically connected to an external power source.

[0014] Preferably, the base plate is further provided with a through connecting hole, one end of the slide rod is inserted into the connecting hole, and the eddy current detection device further includes a connecting piece, which is disposed between the first connecting plate and the second connecting plate and is connected to the end of the slide rod away from the base plate.

[0015] Preferably, a limiting rod is provided on the base plate, the limiting rod passes through the base plate, and its axis is perpendicular to the ground.

[0016] Compared with the prior art, the eddy current detection device provided by this utility model has the following advantages: By sliding the slide rod into the detection component, the detection component is dragged along the base plate as the device moves along the rail. The clearance fit between the slide rod and the detection component, along with the buffering effect of the elastic element, allows the detection component to adapt to the unevenness of the rail surface and maintain a tight fit with the rail, thus improving the accuracy and continuity of the detection. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of an eddy current detection device provided by this utility model; Figure 2 for Figure 1 Exploded view of the detection component; Figure 3 A schematic diagram illustrating the principle of the sliding rod rotating relative to the insertion hole; Figure 4 for Figure 1 A schematic diagram of the structure of the first connecting plate in the middle; Figure 5 for Figure 1 A schematic diagram of the structure of the second connecting plate in the middle; Explanation of reference numerals in the attached figures: 1. Base plate; 11. Limiting rod; 12. Connecting hole; 2. Detection components; 21. First connecting plate; 211. Plug-in hole; 212. Wire hole; 22. Second connecting plate; 221. Coil slot; 23. Connecting column; 24. Second step groove; 3. Slide bar; 4. Elastic components; 5. Connect the wires; 6. Connecting piece. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Please see Figures 1-5 This utility model provides an eddy current detection device for detecting the surface of railway rails, comprising: Base plate 1, detection assembly 2, slide bar 3 and elastic element 4; Multiple detection coils are provided on the side of the detection component 2 away from the base plate 1. The multiple detection coils are electrically connected to an external power source to form detection eddy currents on the surface of the rail. There are two slide rods 3. One end of each slide rod 3 is connected to the opposite sides of the base plate 1, and the end away from the base plate 1 is slidably inserted into the detection component 2. The elastic element 4 is fitted onto the slide bar 3 and is located between the base plate 1 and the detection component 2; There is a gap between the slide bar 3 and the detection component 2 in a direction parallel to the rail.

[0020] Understandably, when using an eddy current testing device to inspect rails, the side of the testing component 2 away from the base plate 1 is placed on the rail and in contact with it. The base plate 1 is used to connect an external moving mechanism (such as a testing trolley), and the base plate 1 and the testing component 2 are pre-compressed with the elastic element 4. During testing, an external power source supplies power to multiple testing coils on the testing component 2. The testing coils generate eddy currents on the rail surface. When defects such as cracks or wear exist on the rail surface, the eddy current distribution changes. By sensing these changes in eddy currents and transmitting signals through the testing coils, defects on the rail surface can be detected.

[0021] Simultaneously, during the testing process, the external moving mechanism drives the base plate 1, which, under the connection of the two sliding rods 3, causes the entire device to move along the extension direction of the rail, continuously testing different areas of the rail. When encountering uneven rail surfaces, due to the gap between the sliding rods 3 and the testing component 2 in the direction parallel to the rail, the testing component 2 can use this gap to rotate slightly relative to the base plate 1. Combined with the elastic buffer of the elastic element 4, this ensures that the testing component 2 always fits as close as possible to the rail surface, guaranteeing the continuity and accuracy of the testing and preventing the testing component 2 from detaching from the rail or being excessively squeezed due to uneven rail surfaces, thus affecting the testing results.

[0022] Understandably, the size of the gap can be set according to requirements, as long as it ensures that there is no interference between the slide bar 3 and the detection component 2 when the detection component 2 rotates slightly. Preferably, the gap is 0.5-1mm, which satisfies the rotation of the detection component 2 while preventing wobbling when the detection component 2 is moved.

[0023] It should be noted that when the base plate 1 moves along the rail under the drive of the external moving mechanism, the two sliding rods 3 will move synchronously with the base plate 1. At this time, although there is a gap H of 0.5-1mm between the sliding rods 3 and the detection component 2 in the direction parallel to the rail, since the detection component 2 is always in contact with the rail and the elastic element 4 is in a pre-compressed state, it will apply pressure towards the rail to the detection component 2, so that there is always a certain contact tendency between the detection component 2 and the sliding rods 3. When the sliding rods 3 move forward with the base plate 1, they will drive the detection component 2 to move along the rail through the contact between the side of the sliding rods 3 and the detection component 2. When the rail is uneven and the detection component 2 rotates slightly relative to the base plate 1, the gap H between the sliding rods 3 and the detection component 2 provides space for this rotation, but in the direction of movement along the rail, the sliding rods 3 can still drag the detection component 2 through contact with it, ensuring that the detection component 2 can continue to move along the rail with the base plate 1 without affecting the continuity of detection. Figure 3 As shown.

[0024] In one embodiment, a limiting rod 11 is provided on the base plate 1, the limiting rod 11 passes through the base plate 1, and its axial direction is perpendicular to the ground.

[0025] Understandably, the limiting rod 11 is used to limit the relative displacement between the detection component 2 and the base plate 1, that is, to limit the elastic deformation of the elastic element 4 and prevent the elastic element 4 from being over-compressed.

[0026] It should be noted that the limiting rod 11 can be threaded into the base plate 1. A knob is provided at the end of the limiting rod 11 away from the base plate 1. By applying external force to the knob, the limiting rod 11 can be rotated, thereby adjusting the limiting distance of the limiting rod 11.

[0027] In one embodiment, the detection component 2 includes a first connecting plate 21 and a second connecting plate 22 that are connected to each other and form a gap. The first connecting plate 21 is provided with a plug hole 211 that penetrates through the first connecting plate 21. The end of the slide rod 3 away from the bottom plate is slidably plugged into the plug hole 211, and there is a gap between the slide rod 3 and the plug hole 211. The detection coil is disposed on the side of the second connecting plate 22 away from the first connecting plate 21.

[0028] Understandably, the slide rod 3 can move within the insertion hole 211 in a direction perpendicular to the ground to adjust the distance between the base plate 1 and the first connecting plate 21, that is, to adjust the distance between the base plate 1 and the detection component 2. Simultaneously, the gap between the slide rod 3 and the insertion hole 211 prevents the first connecting plate 21 from becoming uneven, and when the first connecting plate 21 rotates under the influence of the second connecting plate 22, it does not interfere with the slide rod 3.

[0029] It should be noted that a linear bearing can also be installed between the slide rod 3 and the insertion hole 211. By forming a clearance fit of 0.5-1mm between the slide rod 3 and the linear bearing, interference between the slide rod 3 and the first connecting plate 21 when it rotates can be achieved.

[0030] Furthermore, both the first connecting plate 21 and the base plate 1 are provided with first stepped grooves, and the opposite sides of the elastic member 4 are respectively located in the first stepped grooves of the first connecting plate 21 and the base plate 1.

[0031] It is understandable that the stepped groove can guide the compression direction of the elastic element 4. The stepped groove of the first connecting plate 21 is set on the side away from the second connecting plate 22, and the stepped groove of the bottom plate 1 is set on the side close to the first connecting plate 21.

[0032] Preferably, the elastic element 4 is a spring.

[0033] Furthermore, a connecting post 23 is provided between the first connecting plate 21 and the second connecting plate 22, with the two ends of the connecting post 23 connected to the first connecting plate 21 and the second connecting plate 22 respectively, so as to realize the connection between the first connecting plate 21 and the second connecting plate 23.

[0034] It is understandable that the height of the connecting post 23 is the distance between the first connecting plate 21 and the second connecting plate 22. After the sliding rod 3 passes through the insertion hole 211, it slides between the first connecting plate 21 and the second connecting plate 22.

[0035] Furthermore, both the first connecting plate 21 and the second connecting plate 22 are provided with a second stepped groove 24, and the opposite sides of the connecting column 23 are respectively provided in the second stepped groove 24 on the first connecting plate 21 and the second connecting plate 22.

[0036] Understandably, the second step groove 24 can be used to position the connecting post 23, making it easier to disassemble and install the connecting post 23.

[0037] Furthermore, there are multiple connecting posts 23, which are arranged sequentially and at equal intervals between the first connecting plate 21 and the second connecting plate 22.

[0038] It is understandable that by setting multiple connecting posts 23, the stability of the connection between the first connecting plate 21 and the second connecting plate 22 can be increased, and the relative position between the first connecting plate 21 and the second connecting plate 22 can be prevented from shifting under pressure.

[0039] Furthermore, a coil slot 221 is provided on the side of the second connecting plate 22 away from the first connecting plate 21. There are multiple coil slots 221, which are the same as the number of detection coils. Multiple detection coils are respectively disposed in multiple coil slots 221.

[0040] It is understandable that by setting the coil groove 221, a detection surface can be formed on the side of the second connecting plate 22 away from the first connecting plate 21, so that when the detection surface is in contact with the rail, a distance is formed between the detection coil and the surface of the rail, thereby realizing eddy current detection.

[0041] Furthermore, the first connecting plate 21 is provided with a plurality of wire holes 212, all of which penetrate the first connecting plate 21. The eddy current detection device also includes a plurality of connecting wires 5, which are located in the plurality of wire holes 212 respectively, and there is a gap between each connecting wire 5 and each wire hole 212. The plurality of detection coils are electrically connected to the plurality of connecting wires 5 respectively, and the plurality of connecting wires 5 are electrically connected to an external power source.

[0042] It is understandable that the connecting wires 5 are electrically connected to an external power source, and then electrically connected to the detection coils to power multiple detection coils. At the same time, the multiple connecting wires 5 are bundled together using the wire holes 212 on the first connecting plate 21, which can prevent the multiple connecting wires from getting tangled together when the eddy current detection device moves along the rail.

[0043] It should be noted that by using the gap between the connecting wire 5 and the wire hole 212, interference between the connecting wire 5 and the first connecting plate 21 can be avoided when the second connecting plate 22 rotates due to unevenness of the rail.

[0044] Furthermore, the base plate 1 is also provided with a through connection hole 12, one end of the slide rod 3 is inserted into the connection hole 12, and the eddy current detection device also includes a connecting piece 6, which is disposed between the first connecting plate 21 and the second connecting plate 22 and is connected to the end of the slide rod 3 away from the base plate 1.

[0045] Understandably, the connecting piece 6 is used to limit the slide bar 3 and prevent the slide bar 3 from falling out of the insertion hole 211.

[0046] It should be noted that the connecting piece 6 is only used to prevent the slide bar 3 from falling out of the insertion hole 211 and from interfering with the first connecting plate 21. It can be made of flexible material or can be set in any way, such as by rotating it with the slide bar 3 through a pin. As long as the connecting piece 6 does not interfere with the side of the first connecting plate 21 that is close to the second connecting plate 22 when the detection component 2 rotates.

[0047] In this embodiment, by setting multiple detection coils, parameters can be complemented to improve accuracy, and the limitations of a single coil in the detection of rails under complex working conditions can be solved. This allows it to adapt to both low-speed fine detection (such as rails in station yards) and rapid screening of high-speed lines.

[0048] The working principle of this utility model is as follows: First, the side of the detection component 2 away from the base plate 1 is placed on the rail and attached. The base plate 1 is connected to the external moving mechanism, and the base plate 1 and the detection component 2 are pre-compressed elastic element 4. At the same time, multiple detection coils are electrically connected to the external power supply through connecting wires 5. Then, an external power supply powers multiple detection coils on detection component 2. The detection coils form detection eddy currents on the rail surface. When there are defects such as cracks or wear on the rail surface, the eddy current distribution will change. The detection coils sense the change in eddy currents and transmit signals. Driven by the external moving mechanism, the base plate 1 moves along the rail extension direction under the connection of the two sliding rods 3, continuously detecting different areas of the rail. When encountering uneven rail surfaces, the detection component 2 rotates slightly relative to the base plate due to the gap between the sliding rod 3 and the detection component 2 in the direction parallel to the rail. With the elastic buffer of the elastic element 4, it always tries to fit the rail surface as closely as possible to ensure the accuracy of the detection.

[0049] Compared with the prior art, the eddy current detection device provided by this utility model uses a sliding connection between a slide rod and a detection component. In the direction in which the device moves along the rail, the slide rod drags the detection component to follow the base plate and move continuously. Moreover, by utilizing the gap fit between the slide rod and the detection component and the buffering effect of the elastic element, the detection component can adapt to the unevenness of the rail surface and always maintain a close fit with the rail, thereby improving the accuracy and continuity of the detection.

[0050] Meanwhile, by setting up the first connecting plate and the second connecting plate, a stable double-layer structure is formed, which not only ensures the rigidity of the detection component, but also provides a reasonable spatial layout for the installation of each component. The design of the coil slot and wire hole not only realizes the reasonable arrangement of the detection coil and connecting wire, but also reduces electromagnetic interference and wire entanglement, thus ensuring the stability of the detection signal.

[0051] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An eddy current testing device for inspecting the surface of railway rails, characterized in that, include: Base plate, detection components, slide bar and elastic elements; The detection component has multiple detection coils on the side away from the base plate. The multiple detection coils are electrically connected to an external power source to form detection eddy currents on the rail surface. The number of sliding rods is two, one end of each sliding rod is connected to opposite sides of the base plate, and the end away from the base plate is slidably inserted into the detection component; The elastic element is sleeved on the slide bar and is located between the base plate and the detection component; There is a gap between the slide bar and the detection component in a direction parallel to the rail.

2. The eddy current detection device as described in claim 1, characterized in that: The detection assembly includes a first connecting plate and a second connecting plate that are connected to each other and spaced apart. The first connecting plate is provided with a plug hole that penetrates through the first connecting plate. The end of the slide rod away from the base plate is slidably plugged into the plug hole, and there is a gap between the slide rod and the plug hole. The detection coil is disposed on the side of the second connecting plate away from the first connecting plate.

3. The eddy current detection device as described in claim 2, characterized in that: Both the first connecting plate and the base plate are provided with a first stepped groove, and the opposite sides of the elastic member are respectively located in the first stepped groove of the first connecting plate and the base plate.

4. The eddy current detection device as described in claim 2, characterized in that: A connecting post is provided between the first connecting plate and the second connecting plate, and the two ends of the connecting post are respectively connected to the first connecting plate and the second connecting plate to realize the connection between the first connecting plate and the second connecting plate.

5. The eddy current detection device as described in claim 4, characterized in that: Both the first connecting plate and the second connecting plate are provided with a second stepped groove, and the opposite sides of the connecting column are respectively disposed in the second stepped grooves on the first connecting plate and the second connecting plate.

6. The eddy current detection device as described in claim 5, characterized in that: The number of connecting posts is multiple, and the multiple connecting posts are arranged sequentially and at equal intervals between the first connecting plate and the second connecting plate.

7. The eddy current detection device as described in claim 2, characterized in that: The second connecting plate has a coil slot on the side away from the first connecting plate. There are multiple coil slots, and the number of coil slots is the same as the number of detection coils. The multiple detection coils are respectively disposed in the multiple coil slots.

8. The eddy current detection device as described in claim 2, characterized in that: The first connecting plate is provided with a plurality of wire holes, all of which penetrate the first connecting plate. The eddy current detection device also includes a plurality of connecting wires, which are respectively located in the plurality of wire holes, and there is a gap between each connecting wire and each wire hole. The plurality of detection coils are electrically connected to the plurality of connecting wires, and the plurality of connecting wires are electrically connected to an external power source.

9. The eddy current detection device as described in claim 2, characterized in that: The base plate is also provided with a through connection hole, one end of the slide rod is inserted into the connection hole, and the eddy current detection device also includes a connecting piece, which is disposed between the first connecting plate and the second connecting plate and is connected to the end of the slide rod away from the base plate.

10. An eddy current detection device according to any one of claims 1-9, characterized in that: A limiting rod is provided on the base plate, the limiting rod passes through the base plate, and its axis is perpendicular to the ground.

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