High-precision coating thickness gauge based on phase-sensitive eddy current principle

Abstract

The utility model discloses a high-precision coating thickness gauge based on a phase-sensitive eddy current principle, which comprises a detection main body, a connecting line is arranged on the outer side of the detection main body, a detection probe is arranged at the end part of the connecting line, a support cover is sleeved on the connecting line outside the detection probe, a partition plate is arranged between the support cover and the detection probe, and the partition plate is arranged on the outer side of the detection main body. A fitting sleeve is arranged outside the supporting cover, the fitting sleeve is connected with the detection probe, a plurality of supporting adjusting pieces are arranged between the fitting sleeve and the partition plate and used for adjusting the position of the detection surface of the detection probe, each supporting adjusting piece comprises a base arranged on the partition plate, a supporting spring is arranged at the end of each base, and each supporting spring is connected with the corresponding supporting cover. A base plate abutting against the attaching sleeve is arranged at the top of the supporting spring, and the same limiting rod is arranged between the base plate and the base in a sliding mode. The coating thickness gauge is provided with a probe adjusting structure, so that the flatness of a detection surface is ensured, and the thickness detection accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a thickness detection equipment, especially high accuracy coating thickness gauge based on phase sensitive eddy current principle. BACKGROUND

[0002] The application of phase sensitive eddy current far-off measurement thickness is a kind of non-destructive testing technique based on electromagnetic induction, and it is suitable for measuring the thickness of conductive coating on various substrate materials, such as copper layer on printed circuit board or plating layer on metal surface. The phase sensitive eddy current probe is composed of ferrite core and two coils. The excitation coil generates high-frequency magnetic field, which induces eddy current in the sample. The measuring coil detects the alternating current impedance of the probe, and its change is related to the intensity of eddy current. The coating thickness gauge can infer the thickness of the coating by analyzing the phase angle change of impedance.

[0003] At present, the high-precision coating thickness gauge uses a probe as a detection end, the front end of the probe is protected by wear-resistant insulating material, the detection data is transmitted to the signal processing module through the probe, the detection data can be analyzed, and finally the detection data is displayed on the display screen of the thickness gauge. The surface of the article detected by the high-precision coating thickness gauge is uneven, which can cause poor contact between the probe and the coating, and there is a large error between the detected data and the actual thickness of the coating, which affects the detection accuracy. Based on the above reasons, it is necessary to design a high-precision coating thickness gauge with probe adjusting structure to ensure the flatness of the detection surface and improve the accuracy of thickness detection. UTILITY MODEL CONTENT

[0004] In view of the above problems existing in the prior art, the utility model aims at providing a high-precision coating thickness gauge based on phase sensitive eddy current principle, which realizes that the coating thickness gauge has a probe adjusting structure, ensures the flatness of the detection surface and improves the accuracy of thickness detection.

[0005] To achieve the above purpose, the utility model technical scheme is as follows:

[0006] The high-precision coating thickness gauge based on phase sensitive eddy current principle comprises a detection main body, a connecting line is arranged on the outer side of the detection main body, a detection probe is arranged at the end of the connecting line, a support cover is arranged on the connecting line outside the detection probe, a partition plate is arranged between the support cover and the detection probe, a matching sleeve is arranged on the outer side of the support cover, the matching sleeve is connected with the detection probe, a plurality of support adjusting members are arranged between the matching sleeve and the partition plate for adjusting the position of the detection surface of the detection probe.

[0007] As a preferred, the support adjusting member comprises a base arranged on the partition plate, a support spring is arranged at the end of the base, a pad plate abutting against the matching sleeve is arranged at the top of the support spring, a same limiting rod is slidably arranged between the pad plate and the base, and the limiting rod penetrates the partition plate for stable support of the detection probe.

[0008] Preferably, the base and the partition plate are provided with through holes for the limiting rods to pass through, and the lower end of the limiting rod is provided with a reference plate, and the reference plate is provided with a distance measuring sensor for detecting the stable detection of the probe and the detection surface.

[0009] Preferably, the gasket is provided on the gasket, and the base is made of elastic material for supporting the stable support of the spring on the gasket.

[0010] Preferably, the detection probe is located in the middle of the gasket, the height of the gasket is higher than the height of the detection probe, and the surface of the gasket is provided with a frosted layer.

[0011] Preferably, the support cover expands outward at one end close to the detection probe, and the outer side of the narrow end of the support cover is provided with a plurality of indicator lights for intuitive display of the state of the detection surface.

[0012] Preferably, the detection main body is provided with a clamping limiting groove for the support cover, and the clamping block is arranged on the inner side of the groove for protection of the detection probe.

[0013] Compared with the prior art, the coating thickness gauge based on the phase-sensitive eddy current principle has a probe adjusting structure, which ensures the flatness of the detected surface and improves the accuracy of thickness detection. Specifically, the support cover and the gasket are arranged on the detection probe, which facilitates the full adhesion of the probe to the detected surface in different states. Then, a plurality of support adjusting members are arranged between the gasket and the partition plate, which increases the support and buffer structure between the gasket and the partition plate. The distance measuring sensor is arranged in the plurality of support adjusting members, which facilitates the monitoring of the deformation length of the support spring and the judgment of the pressure size in different directions of the detection probe, thereby providing convenience for the position adjustment of the detection probe, ensuring the flat adhesion of the detection probe and the detection surface, thereby increasing the stability of the thickness gauge detection process and improving the accuracy of the detection data of the thickness gauge.

[0014] It should be understood that the general description and the details herein are only exemplary and illustrative, but not for limiting the disclosure.

[0015] The present application file provides a variety of implementations or exemplary summaries of the technology described in the disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure of the high-precision coating thickness gauge based on the phase-sensitive eddy current principle of the utility model is shown in the figure.

[0017] Figure 2The utility model discloses a high precision coating thickness gauge based on phase sensitive eddy current principle's detection probe and the structure explosion map of support cover in it.

[0018] Figure 3 The utility model discloses a high precision coating thickness gauge based on phase sensitive eddy current principle's connecting line and the local structure schematic view of support cover in it.

[0019] Figure 4 The utility model discloses a high precision coating thickness gauge based on phase sensitive eddy current principle's support adjusting spare and the structure schematic view of fitting cover and baffle in it.

[0020] Figure 5 The utility model discloses a high precision coating thickness gauge based on phase sensitive eddy current principle's support adjusting spare and the structure schematic view of fitting cover and baffle in it.

[0021] Figure 6 The utility model discloses a high precision coating thickness gauge based on phase sensitive eddy current principle's support adjusting spare and the structure schematic view of fitting cover and baffle in it.

[0022] Main drawing mark:

[0023] 1, detection main body;2, connecting line;3, detection probe;4, support cover;5, baffle;6, support adjusting spare;7, base;8, support spring;9, pad;10, limit rod;11, reference plate;12, through -opening;13, distance measuring sensor;14, elastic pad;15, fitting cover;16, frosted layer;17, pilot lamp;19, clamping block;20, limit slot. Specific implementation

[0024] In order to make the purpose, technical scheme and advantage of the embodiment of the present disclosure more clear, the embodiment of the present disclosure is more clearly and detailedly described below in combination with the drawings of the embodiment. Note: the described embodiment is a part of the embodiment of the present disclosure, not all the embodiment. All other embodiments obtained by the person skilled in the art on the basis of the described embodiment of the present disclosure without the premise of creative labor all belong to the protection scope of the present disclosure.

[0025] As the drawing Figure 1 To the drawing Figure 6As shown, the embodiment of the utility model provides the high accuracy coating thickness gauge based on phase sensitive eddy current principle, and the phase sensitive eddy current principle is based on electromagnetic induction phenomenon, and its core lies in distinguishing electromagnetic response of different materials by using phase analysis technology, and realizes accurate measurement of coating thickness. When thickness is measured, the thickness gauge probe generates high-frequency alternating electromagnetic field, when contacting the measured object (such as the coating on the surface of metal matrix), electromagnetic field can induce eddy current in the metal matrix; the size and phase of eddy current are closely related to the conductivity, magnetic permeability of metal matrix and coating thickness; the instrument analyzes the phase change of eddy current signal through high-precision phase detection circuit, combines calibration parameters (such as matrix material properties, coating type), and reverses the coating thickness through algorithm. The thickness gauge currently includes detection main body 1 and detection probe 3, and the detection main body 1 is connected with the detection probe 3 through the connecting line 2, and the detection data is transmitted to the detection main body 1 through the detection probe 3, and the coating thickness is displayed on the display screen after the data is processed and analyzed by the detection main body 1. In order to facilitate the stable thickness detection of the thickness gauge, the support cover 4 can be sleeved on the connecting line 2 outside the detection probe 3, the external part of the detection probe 3 is protected, then the partition plate 5 is arranged between the support cover 4 and the detection probe 3, the support cover 4 is divided into two spaces, the fitting sleeve 15 is arranged outside the support cover 4, the inner side of the fitting sleeve 15 is connected with the outer surface of the detection probe 3, then a plurality of support adjusting parts 6 are arranged between the fitting sleeve 15 and the partition plate 5, the support structure between the fitting sleeve 15 and the partition plate 5 is increased, the detection probe 3 is protected by shock absorption, the detection of the pressure bearing of the detection probe 3 by the plurality of support adjusting parts 6 can judge the flatness of the detected surface, the detection probe 3 is adjusted to the flat detection surface for detection, and the accuracy of the detection data is increased.

[0026] Wherein, it is worth mentioning that, as Figure 5 As shown, in some embodiments, the support adjusting part 6 can include the base 7 (as the limiting end) arranged on the partition plate 5, then the support spring 8 is arranged at the end of the base 7, the top of the support spring 8 is provided with the pad 9 and abuts against the fitting sleeve 15. The support adjusting part 6 is vertically arranged between the partition plate 5 and the fitting sleeve 15, and provides support for the vertical abutment between the detection probe 3 and the detection coating; then, in order to stabilize the expansion of the support spring 8, the limiting rod 10 can be slid between the pad 9 and the base 7, one end of the limiting rod 10 is fixedly connected with the pad 9, the other end of the limiting rod 10 penetrates the partition plate 5, when the support adjusting part 6 assists the probe, the support spring 8 is compressed under stress, and can drive the limiting rod 10 to penetrate the base 7, so that the support cover 4 is prevented from shaking due to the deformation of the fitting sleeve 15, and the periphery of the detection probe 3 is stably supported.

[0027] Further, as Figure 6As shown, in some embodiments, openings 12 can be made on both the base 7 and the partition 5 to facilitate the passage of the limiting rod 10 through the base 7 and the partition 5, allowing the limiting rod 10 to slide. Then, a reference plate 11 is set at the lower end of the limiting rod 10. When the limiting rod 10 is not under force, the reference plate 11 is in contact with the partition 5. A distance sensor 13 is then set on the reference plate 11. Using existing sensor distance detection technology, the distance sensor 13 can detect the distance between the reference plate 11 and the partition 5, thus detecting the sliding distance of the limiting rod 10. By using the distance sensors 13 in multiple support adjustment components 6 simultaneously, the force conditions of the detection probe 3 and the detection surface in different ranges can be obtained. When the detection data of one support adjustment component 6 is abnormal, it indicates that the detection surface where the detection probe 3 is located is not flat. The detection surface of the detection probe 3 can be replaced, which facilitates the stable detection of the detection probe 3 and the detection surface and makes it easy to adjust the position of the detection probe 3 and the detection coating.

[0028] Secondly, in some embodiments, in order to increase the support stability of the support adjustment member 6 on the detection probe 3, an elastic pad 14 can be provided on the pad plate 9, and the base 7 can be made of elastic materials such as rubber. Through the expansion and contraction deformation of the support spring 8 and the buffering effect of the elastic pad 14, the compressive impact force on the fitting sleeve 15 is weakened, ensuring the smooth compression of the fitting sleeve 15 and improving the support stability of the support spring 8 on the fitting sleeve 15.

[0029] And, as Figure 4 As shown, to ensure efficient protection of the detection probe 3 by the fitting sleeve 15, the detection probe 3 can be positioned in the middle of the fitting sleeve 15, and the height of the fitting sleeve 15 can be set higher than the height of the detection probe 3. This facilitates the fitting sleeve 15 to preferentially adhere to the detection surface when the thickness of the detection probe 3 is being measured, thus assisting the detection probe 3 in being stably attached to the detection surface for measurement. Subsequently, multiple support adjustment components 6 are arranged in a ring on the partition plate 5, allowing multiple support adjustment components 6 to simultaneously support the area around the detection probe 3. The frosted layer 16 on the surface of the fitting sleeve 15 increases the roughness of the outer surface of the fitting sleeve 15, increasing the adhesion stability between the fitting sleeve 15 and the detection surface, preventing the detection probe 3 from loosening and causing errors in the detection data, and improving the accuracy of the detection data.

[0030] To facilitate the rapid placement of the detection probe 3 on the flat coating for detection, such as Figure 3 and 4As shown, in some embodiments, the support cover 4 can be expanded outwardly near one end of the detection probe 3, and set as a larger size bucket-shaped structure, increasing the contact area of the fitting sleeve 15 with the detection surface, and then setting a plurality of indicator lights 17 on the outside of the narrow end of the support cover 4, the number of the plurality of indicator lights 17 being the same as the number of the support adjusting members 6, and then connecting each indicator light 17 with the detection main body 1, when the ranging sensor 13 in the support adjusting member 6 is used, the plurality of ranging sensors 13 can respectively detect the pressed distance in different directions of the detection probe 3, when the detection data of the ranging sensor 13 is abnormal, the corresponding indicator light 17 can be triggered to light up, indicating that the detection surface is concave or convex at this position, directly showing the state of the detection surface, and providing convenience for the detection of the detection probe 3 and the flat coating.

[0031] Finally, in order to facilitate the long-time use of the detection probe 3, such as Figure 6 As shown, in some embodiments, a limiting groove 20 for clamping the support cover 4 can be formed on the detection main body 1, and then a clamping block 19 can be arranged on the inner circumferential side of the limiting groove 20, so that the support cover can be clamped in the limiting groove 20 for fixation, and the detection probe 3 can be protected, thereby prolonging the service life.

[0032] Of course, the above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements are also considered to be within the protection scope of the present application.

Claims

1. High-precision coating thickness gauge based on phase-sensitive eddy current principle, comprising a detection main body (1), the outer side of the detection main body (1) is provided with a connecting line (2), and the end of the connecting line (2) is provided with a detection probe (3), characterized in that: a support cover (4) is arranged on the connecting line (2) outside the detection probe (3), a partition plate (5) is arranged between the support cover (4) and the detection probe (3), a fitting sleeve (15) is arranged outside the support cover (4), the fitting sleeve (15) is connected with the detection probe (3), and a plurality of support adjusting members (6) are arranged between the fitting sleeve (15) and the partition plate (5) and used for position adjustment of a detection surface of the detection probe (3).

2. The high-precision coating thickness gauge based on the phase-sensitive eddy current principle according to claim 1, characterized in that, The support adjusting member (6) comprises a base (7) arranged on the partition plate (5), a support spring (8) is arranged at the end of the base (7), a pad plate (9) abutting against the fitting sleeve (15) is arranged at the top of the support spring (8), a same limiting rod (10) is slidably arranged between the pad plate (9) and the base (7), the limiting rod (10) penetrates through the partition plate (5), and the limiting rod (10) is used for stable support of the detection probe (3).

3. The high-precision coating thickness gauge based on the phase-sensitive eddy current principle according to claim 2, characterized in that, A through hole (12) through which the limiting rod (10) penetrates is formed in the base (7) and the partition plate (5), a reference plate (11) is arranged at the lower end of the limiting rod (10), a distance measuring sensor (13) is arranged on the reference plate (11), and the distance measuring sensor (13) is used for stable detection of the detection probe (3) and a detection surface.

4. The high-precision coating thickness gauge based on the phase-sensitive eddy current principle according to claim 3, characterized in that, An elastic pad (14) is arranged on the pad plate (9), the base (7) is made of an elastic material, and the elastic pad (14) is used for stable support of the support spring (8) on the fitting sleeve (15).

5. The high precision coating thickness gauge based on the eddy current principle of phase sensitivity according to claim 1, characterized in that, The detection probe (3) is located in the middle of the fitting sleeve (15), the height of the fitting sleeve (15) is higher than the height of the detection probe (3), a plurality of support adjusting members (6) are annularly distributed on the partition plate (5), and a frosted layer (16) is arranged on the surface of the fitting sleeve (15).

6. The high precision coating thickness gauge based on the eddy current principle of phase sensitivity according to claim 1, characterized in that, One end of the support cover (4) close to the detection probe (3) is expanded outward, a plurality of indicator lamps (17) are arranged on the outer side of the narrow end of the support cover (4) and used for intuitive display of the state of a detection surface.

7. The high precision coating thickness gauge based on the eddy current principle of phase sensitivity according to claim 1, characterized in that, A clamping limiting groove (20) for clamping the support cover (4) is formed in the detection main body (1), a clamping block (19) is arranged on the inner side of the groove of the limiting groove (20), and the clamping block (19) is used for protection of the detection probe (3).

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