Equipment and methods for measuring the coating thickness of graphene coatings

Abstract

This invention relates to the field of graphene coating testing technology, specifically to a device and method for testing the coating thickness of graphene coatings. The device for testing the coating thickness of graphene coatings includes: a semi-circular frame, comprising two sets of left and right sides that can be joined to form a complete annular structure, with a spiral groove on the inner side of the semi-circular frame; an ultrasonic thickness gauge; a liquid reservoir located at the non-detecting end of the ultrasonic thickness gauge probe, containing a coupling agent; and a probe support assembly located on the outer periphery of the probe, capable of adaptively conforming to the curved surface profile when the probe presses against the pipe. This invention can automatically and precisely spray the coupling agent onto the corresponding detection area before the probe contacts the pipe, achieving targeted and quantitative application of the coupling agent and ensuring consistent acoustic coupling conditions before each measurement.

Description

Technical Field

[0001] This invention relates to the field of graphene coating testing technology, specifically to equipment and methods for testing the coating thickness of graphene coatings. Background Technology

[0002] Graphene coatings are widely used in oil and gas pipelines, high-temperature components, and other applications, including industrial corrosion protection, conductive coatings, thermal conductivity, and special protection. Thickness testing is crucial because the performance of graphene coatings highly depends on the uniformity of the coating distribution. Uneven coatings can lead to performance degradation, localized corrosion, or uneven heat dissipation, affecting equipment stability and lifespan. Uniform graphene coatings ensure that the material's properties are fully utilized, meeting the high reliability requirements of industrial applications.

[0003] However, the following problems still exist in the process of thickness detection of pipes coated with graphene paint:

[0004] When using an ultrasonic thickness gauge to perform multi-point thickness measurement of graphene coatings, the application of coupling agent usually relies on manual application, which has defects such as uneven coating, uncontrollable dosage, and positional deviation. This can easily cause poor acoustic coupling, resulting in attenuation, fluctuation, or distortion of the ultrasonic signal, affecting the stability and repeatability of the measurement. At the same time, manual point-by-point detection is inefficient and inconsistent, which can easily reduce the overall reliability and accuracy of the detection.

[0005] Because the end face of the ultrasonic probe is flat while the surface of the pipe is curved, the two cannot fit together completely when in direct contact. When testing on a curved surface, the probe is prone to tilting, resulting in uneven contact pressure distribution and unstable coupling state, which in turn causes fluctuations in the measurement signal and significantly reduces the repeatability and accuracy of the test data. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a device and method for detecting the coating thickness of graphene coatings, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] Equipment for measuring the coating thickness of graphene coatings includes:

[0009] A semi-circular frame, which has two sets, left and right, that can be combined to form a complete ring structure; a spiral groove is provided on the inner side of the semi-circular frame.

[0010] An ultrasonic thickness gauge is installed inside a semi-circular frame with its probe facing the central axis of the semi-circular frame. The ultrasonic thickness gauge is fixed on a mounting frame, which can move stably along the trajectory of a spiral groove. The probe of the ultrasonic thickness gauge can move radially closer to the pipe while moving along the trajectory of the spiral groove, and is used to measure the thickness of the graphene coating on the pipe surface.

[0011] The liquid storage box is located at the non-detecting end of the ultrasonic thickness gauge probe. It contains a coupling agent. Multiple swingable feeding tubes are arranged circumferentially on the outside of the probe. The feeding tubes are connected to the liquid storage box, which can accurately spray the coupling agent to the corresponding detection area in front of the probe contact tube.

[0012] A probe support assembly is disposed on the outer periphery of the probe and can adapt to the curved surface profile and evenly distribute the contact pressure when the probe presses against the pipe.

[0013] The probe support assembly includes a contact roller, which is rotatably mounted on a connecting frame. The feeding tube is an elastic telescopic tube, and the connecting frame is hinged to the telescopic section of the feeding tube via a torsion spring shaft.

[0014] The probe support assembly includes an elastic contact rod, which is evenly arranged circumferentially on the outside of the probe, and its end is provided with a rubber pad.

[0015] The bottom of the liquid storage box is fixedly installed with a mounting plate sleeved on the outside of the probe. The feeding tube is hinged to the mounting plate by a torsion spring rod. A guide groove plate that is radially slidably connected to the mounting plate is provided on the side of the feeding tube away from the probe. A sliding rod that is slidably engaged with the guide groove plate is installed in the middle of the feeding tube. A linkage plate is hinged to the end of the guide groove plate away from the feeding tube. The other end of the linkage plate is hinged to the outer periphery of the mounting plate.

[0016] A pressure plate is installed at the end of the linkage plate away from the guide groove plate. A pressure ring that can slide axially is sleeved on the outer periphery of the liquid storage box. A pressure rod that cooperates with the corresponding pressure plate is installed on the side of the pressure ring near the mounting plate.

[0017] The top of the liquid storage box is provided with a pressure plate that slides with the probe. The pressure ring is equipped with connecting posts that are evenly distributed circumferentially and slide with the pressure plate. A connecting spring sleeved on the outside of the connecting posts connects the pressure plate and the pressure ring.

[0018] A push plate is provided on the side of the pressure plate away from the liquid storage box. A push rod is installed on the push plate. The push rod passes through the pressure plate and slides with the connecting column. A pressure spring is sleeved on the outside of the push rod. An elastic telescopic column is fixedly installed on the inside of the mounting frame. The telescopic section of the elastic telescopic column is fixedly connected to the push plate and slides with the pressure plate.

[0019] A movable frame is fixedly installed on the probe, and a push rod for pushing the push plate is installed on the movable frame. A movable rod that is radially slidably connected to the mounting frame is installed at the end of the movable frame away from the probe.

[0020] The spiral groove has several protrusions evenly distributed along its spiral trajectory.

[0021] The mounting bracket is fixedly connected to the telescopic end of the telescopic rod, which is mounted on an external gear ring. A rotating gear meshes with the outer side of the external gear ring, and the rotating gear is connected to the output shaft of the drive motor.

[0022] The guide groove plate has an elastic telescopic plate installed on one side near the central axis of the mounting plate. The telescopic end of the elastic telescopic plate is fixedly connected to an arc-shaped clamping plate, which can apply a stable clamping force to the probe.

[0023] A method for measuring the coating thickness of graphene coatings, applicable to the aforementioned equipment for measuring the coating thickness of graphene coatings, includes the following steps:

[0024] Step 1: Place the pipe to be inspected on the inspection platform, positioning it between the left and right semi-circular frames. Move the two sets of semi-circular frames towards each other, so that they fit together to form a closed ring structure. At the same time, move the ultrasonic thickness gauge to the outer circumference of the pipe.

[0025] Step 2: The ultrasonic thickness gauge can move along the spiral groove on the inner side of the semi-circular frame and move radially along the semi-circular frame to approach the pipe. Before the probe contacts the pipe, the liquid storage box accurately sprays the coupling agent into the corresponding detection area through the feeding pipe.

[0026] Step 3: Continue to advance the ultrasonic thickness gauge probe radially. At this time, the probe support component on its outer periphery will first contact the curved surface of the pipe and adapt to deformation, supporting the probe to stably fit the detection area and complete the single-point thickness measurement.

[0027] Step 4: After the test is completed, record the measurement point data and continue to move the ultrasonic thickness gauge along the spiral groove trajectory so that it continues to cover the pipe surface with the spiral trajectory, so as to realize continuous multi-point detection of the coating thickness.

[0028] The present invention has the following beneficial effects:

[0029] (1) The graphene coating thickness detection equipment, by setting multiple swingable feeding tubes, can automatically and accurately spray the coupling agent to the corresponding detection area in front of the probe contact tube, realize the fixed point and quantitative application of the coupling agent, effectively avoid the defects of uneven coating, position offset and uncontrollable amount in traditional manual application, ensure that the acoustic coupling conditions are consistent before each measurement, significantly improve the stability of the thickness measurement signal and the repeatability of the detection data. At the same time, the process does not require manual intervention, simplifying the operation process, shortening the detection cycle and improving the overall detection efficiency.

[0030] (2) The graphene coating thickness detection equipment can significantly enhance the stability of the thickness measurement signal by setting a probe support component on the outer periphery of the probe, solve the problem that the planar probe is prone to tilting on the curved pipe, improve the fit and repeatability of the detection process, effectively reduce the measurement error caused by contact deviation, and enhance the overall reliability and practicality of the detection.

[0031] (3) The graphene coating thickness detection equipment, the ultrasonic thickness gauge measures the thickness of the graphene coating on the pipe surface through a spiral multi-point moving trajectory. The probe forms a continuous and uniform spiral scanning path along the pipe wall, which not only effectively covers the entire detection area and avoids omissions, but also significantly improves the flexibility of the detection path and the measurement coverage accuracy.

[0032] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0033] Figure 1 This is an overall diagram of the present invention;

[0034] Figure 2 This is a partial structural diagram of the external toothed ring, telescopic rod, and semi-circular frame in this invention;

[0035] Figure 3 This is a schematic diagram of the semi-circular frame and spiral groove in this invention;

[0036] Figure 4 This is a schematic diagram of the telescopic rod and mounting frame in this invention;

[0037] Figure 5 This is a schematic diagram of the mounting frame, the moving rod, and the ultrasonic thickness gauge in this invention;

[0038] Figure 6 This is a partial cross-sectional view of the push plate and pressure plate in this invention;

[0039] Figure 7 This is a partial cross-sectional view of the liquid storage box and the pressure ring in this invention;

[0040] Figure 8 This is a schematic diagram of the structure of the mounting plate, linkage plate, and pressure plate in this invention;

[0041] Figure 9 This is a bottom view of the feeding tube and probe support assembly in Embodiment 1 of the present invention;

[0042] Figure 10 This is a schematic diagram of the feeding pipe, contact roller, and connecting frame in Embodiment 1 of the present invention;

[0043] Figure 11 This is a bottom view of the feeding tube and probe support assembly in Embodiment 2 of the present invention;

[0044] Figure 12 This is a schematic diagram of the ultrasonic thickness gauge in this invention.

[0045] In the diagram, 1. Testing table; 11. Support; 111. Semi-circular frame; 112. Mounting frame; 113. Mounting rod; 2. Ultrasonic thickness gauge; 21. Liquid storage box; 211. Feeding pipe; 212. Mounting plate; 213. Guide groove plate; 214. Linkage plate; 215. Pressure plate; 216. Pressure ring; 217. Pressure rod; 218. Pressure plate; 219. Connecting column; 220. Connecting spring; 221. Push plate; 222. Push rod; 22 3. Compression spring; 224. Elastic telescopic column; 225. Moving frame; 226. Support rod; 227. Moving rod; 228. Side rod; 229. Side plate; 230. Column; 231. Rotating gear; 232. Drive motor; 233. Auxiliary spring; 234. External gear ring; 235. Telescopic rod; 3. Probe support assembly; 31. Contact roller; 32. Connecting frame; 33. Elastic contact rod; 34. Arc-shaped clamp; 35. Elastic telescopic plate. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0048] The following reference Figures 1-12 This invention describes the coating thickness detection equipment and method for graphene coatings provided in the embodiments of the present invention.

[0049] On the one hand, the present invention provides a device for detecting the coating thickness of graphene coatings.

[0050] Example 1, please refer to this example. Figures 1-10 , Figure 12 .

[0051] Please refer to Figure 1 The graphene coating thickness detection equipment includes a detection platform 1. Before detecting the thickness of the graphene coating on the surface of the pipe, the pipe to be tested is placed on the support 11 set on the upper end of the detection platform 1 to ensure that its position is fixed and its axis is horizontal, so as to provide stable support for subsequent testing.

[0052] Please refer to Figures 1-3 Two sets of semi-circular frames 111 are slidably installed on the upper end of the testing platform 1. The two sets of semi-circular frames 111 are arranged opposite each other and can be joined together to form a complete circular structure, which is then fitted onto the outer circumference of the pipe to be tested. After being joined together, the left and right semi-circular frames 111 are fastened together with bolts. Each semi-circular frame 111 has a spiral groove on its inner wall. When the two halves are joined together, the ends of the spiral grooves on both sides are precisely aligned to form a continuous and closed spiral trajectory.

[0053] Please refer to Figure 4 and Figure 5 To achieve multi-point thickness and uniformity detection of the graphene coating on the pipe surface, an ultrasonic thickness gauge 2 is installed inside the semi-circular frame 111. The ultrasonic thickness gauge 2 is fixed to the mounting frame 112 via a clamping structure. A mounting rod 113, which slides along the inner wall of the semi-circular frame 111, is installed on the mounting frame 112 to support it and ensure stable movement along the spiral groove trajectory. The probe of the ultrasonic thickness gauge 2 faces the central axis of the pipe and can move radially closer to the pipe while moving along the spiral groove trajectory. The ultrasonic thickness gauge 2 is connected to the probe via a signal connection line (e.g., ...). Figure 12 As shown in the figure, during the detection process, each ultrasonic thickness gauge 2 simultaneously collects thickness data, acquiring coating thickness data at multiple locations along the circumference. By analyzing the dispersion of the data at each measuring point, the uniformity of the graphene coating can be evaluated.

[0054] Please refer to Figures 7-10Before the ultrasonic thickness gauge probe 2 contacts the pipe surface, a coupling agent needs to be applied to eliminate air gaps, ensure effective sound wave transmission, and improve detection stability and measurement accuracy. To this end, a liquid storage box 21 is set at the non-detection end of the probe to store an appropriate amount of coupling agent. The top of the liquid storage box 21 is equipped with a liquid inlet for easy external replenishment of coupling agent. Multiple swingable feeding tubes 211 are arranged circumferentially on the outside of the probe. The feeding tubes 211 are connected to the liquid storage box 21, which can accurately spray the coupling agent to the corresponding detection area before the probe contacts the tube, realizing fixed-point and quantitative application. This avoids problems such as unevenness, positional deviation, and uncontrolled dosage that exist in manual application, ensuring that the coupling state is consistent before each measurement, significantly improving the stability and repeatability of detection data, while reducing operation steps, saving operation time, and improving overall detection efficiency.

[0055] Specifically, the liquid storage box 21 is connected to the mounting plate 212 by adhesive or mechanical fixation. The mounting plate 212 is fitted onto the non-detection end of the probe and has a snap-fit ​​structure that engages with the probe for quick assembly, disassembly and positioning. The feeding tube 211 is hinged to the mounting plate 212 by a torsion spring rod and connects to the liquid storage box 21 after passing through the mounting plate 212. The connection between the feeding tube 211 and the mounting plate 212 adopts a retractable elastic hose structure, which ensures unobstructed flow and allows the feeding tube 211 to rotate freely and move slightly during swinging. Under the elastic pre-tightening action of the torsion spring rod, the liquid outlet end of the feeding tube 211 is located on one side of the probe detection surface in the initial state, in a retracted posture.

[0056] Please refer to Figures 7-10 To achieve swing control of the feeding tube 211, a guide groove plate 213 is provided on the side of the feeding tube 211 away from the probe, which is radially slidably connected to the mounting plate 212. A slide rod is installed in the middle of the feeding tube 211, which is slidably engaged with the guide groove plate 213. When the guide groove plate 213 moves radially along the mounting plate 212, the slide rod can drive the feeding tube 211 to overcome the preload of the torsion spring rod and swing outward around its hinge point to avoid the probe detection path.

[0057] Please refer to Figures 5-7 To drive the guide plate 213 to move radially along the mounting plate 212, a linkage plate 214 is hinged to one end of the guide plate 213 away from the feeding pipe 211. The other end of the linkage plate 214 is hinged to the outer periphery of the mounting plate 212. A pressure plate 215 is installed at one end of the linkage plate 214 away from the guide plate 213. A pressure ring 216 that can slide axially is sleeved on the outer periphery of the liquid storage box 21. A side rod 228 that slides with the pressure ring 216 is installed on the mounting plate 212. The side rod 228 is used to provide guide support for the axial movement of the pressure ring 216. A pressure rod 217 that cooperates with the corresponding pressure plate 215 is installed on the side of the pressure ring 216 near the mounting plate 212.

[0058] The pressure ring 216 can slide along the axial direction of the liquid storage box 21, and the pressure rod 217 on it moves accordingly and presses against the pressure plate 215, forcing the pressure plate 215 to tilt in the direction of the axis of the mounting plate 212. Thus, the guide groove plate 213 can be pulled radially outward by the linkage plate 214. When the pressure ring 216 drives the pressure rod 217 away from the pressure plate 215, under the action of the elastic restoring force of the torsion spring rod, the feeding pipe 211, the guide groove plate 213 and the linkage plate 214 are restored to the initial retracted state in sequence.

[0059] Please refer to Figures 5-7 To achieve the spraying of the coupling agent, a pressure plate 218 is provided on the top of the liquid storage box 21, which slides and engages with the probe. The pressure plate 218 can act on the upper part of the liquid storage box 21 to apply squeezing pressure. The liquid storage box 21 is made of a compressible flexible material. After being compressed, the volume of the inner cavity decreases. Under the positive pressure, the internal coupling agent is discharged outward through the connected feeding pipe 211. At this time, the feeding pipe 211 is still in the initial contracted state, and the liquid outlet is aligned with the predetermined position of the probe to ensure that the coupling agent is accurately sprayed on the area to be detected on the pipeline. The compression deformation of the liquid storage box 21 is independent of the axial movement of the pressure ring 216. The two do not interfere with each other. Moreover, when the external force is removed, the liquid storage box 21 can rely on the elasticity of the material itself to restore its original shape, forming a sealed space to prevent leakage of internal residual liquid or air entry. The coupling agent is only released quantitatively when squeezed by the pressure plate 218, realizing the control effect of applying on demand and discharging immediately when needed, avoiding leakage or residue.

[0060] To enable the pressure ring 216 to move along the axial direction of the liquid storage box 21, connecting posts 219 are installed on the pressure ring 216, which are circumferentially evenly distributed and slide in cooperation with the pressure plate 218. The connecting posts 219 slide through the pressure plate 218. A connecting spring 220 is sleeved on the outside of the connecting post 219 between the pressure plate 218 and the pressure ring 216. Initially, the pressure ring 216 is positioned close to the pressure plate 218 under the action of the connecting spring 220.

[0061] Please refer to Figures 5-7 A push plate 221 is provided on the side of the pressure plate 218 away from the liquid storage box 21. A push rod 222 is installed on the push plate 221. The push rod 222 passes through the pressure plate 218 and slides with the connecting column 219. A pressure spring 223 is sleeved on the outside of the push rod 222. An elastic telescopic column 224 is installed on the mounting bracket 112. The telescopic section of the elastic telescopic column 224 is fixedly connected to the push plate 221 and slidably connected to the pressure plate 218. In the initial state, under the elastic force of the elastic telescopic column 224, the push plate 221 remains in the initial position away from the pressure plate 218. At the same time, the pressure spring 223 and the connecting spring 220 apply a restoring force to the pressure plate 218 and the pressure ring 216 respectively, so that they are in the released state, ensuring that the liquid storage box 21 is not compressed and the feeding tube 211 remains retracted.

[0062] When the test begins, the push plate 221 is moved towards the pressure plate 218 under force, and the elastic telescopic column 224 is stretched synchronously. At this time, the push rod 222 moves with the push plate 221 and first transmits the pressure to the pressure plate 218 through the pressure spring 223, causing the pressure plate 218 to press down on the flexible liquid storage box 21, forcing the internal coupling agent to be accurately sprayed out through the feeding tube 211, which is still in the retracted state, to complete the pre-coating of the test point. During this stage, the push rod 222 only compresses the pressure spring 223 and pushes the pressure plate 218, without driving the connecting column 219 and the pressure ring 216 to move.

[0063] After the coupling agent is sprayed, the push plate 221 continues to move downward, and the push rod 222 further acts on the connecting column 219 to overcome the tension of the connecting spring 220, causing the pressure ring 216 to move downward synchronously. This causes the pressure rod 217 on the pressure ring 216 to press against the pressure plate 215 at the end of the linkage plate 214, driving the linkage plate 214 to tilt, thereby opening and avoiding the feeding tube 211 and providing space for the probe to fit against the tube surface.

[0064] Please refer to Figure 5 and Figure 6 To control the movement of the push plate 221, a movable frame 225 is installed on the side of the push plate 221 away from the pressure plate 218. A stop rod 226 for pushing the push plate 221 is installed on the movable frame 225. A side plate 229 is installed on the outer periphery of the movable frame 225. A column 230 that slides vertically with the side plate 229 is installed on the mounting plate 212. An auxiliary spring 233 is sleeved on the outer side of the column 230, located between the side plate 229 and the mounting plate 212, to facilitate movement between the movable frame 225 and the mounting plate 218. The elastic support connection between 12 maintains a certain distance between the abutment 226 and the push plate 221 in the initial state to ensure that the system is in the reset state. When the detection is started, the probe drives the moving frame 225 to advance towards the pipe surface. As the distance shortens, the abutment 226 on the moving frame 225 gradually approaches and eventually contacts the push plate 221. When it continues to advance, the abutment 226 applies a thrust to the push plate 221 to overcome the preload of the elastic telescopic column 224 and drive the push plate 221 to move along the probe axis.

[0065] Please refer to Figures 2-5 In order to make the ultrasonic thickness gauge 2 and its probe radially close to the pipe surface, a moving rod 227 is installed at the end of the moving frame 225 away from the probe and is radially slidably connected to the mounting frame 112. The moving rod 227 is embedded in the spiral groove on the inner wall of the semi-circular frame 111, and several protrusions are evenly distributed along its spiral trajectory in the spiral groove.

[0066] Please refer to Figure 1 , Figure 2 and Figure 4An external gear ring 234 is rotatably mounted on the bracket 11 located on the left side. A rotating gear 231 meshes with the outer side of the external gear ring 234. The rotating gear 231 is connected to the output shaft of the drive motor 232. The drive motor 232 is mounted on the bracket 11 via a support. A telescopic rod 235 is mounted on the external gear ring 234. The telescopic end of the telescopic rod 235 is fixedly connected to the mounting bracket 112.

[0067] After the two sets of semi-circular frames 111 are assembled, the drive motor 232 is started, which drives the rotating gear 231 to rotate. The outer gear ring 234 meshing with it rotates synchronously, and drives the mounting frame 112 and the ultrasonic thickness gauge 2 to rotate around the pipeline axis through the telescopic rod 235 connected to it. During this process, the moving rod 227 on the mounting frame 112 is embedded in the spiral groove on the inner wall of the semi-circular frame 111. Constrained by the trajectory of the spiral groove, it moves smoothly along the spiral path, realizing the spiral full-coverage scanning of the pipeline surface by the probe. At the same time, the drive motor 232 adopts an intermittent working mode to reserve stable measurement time for the data acquisition of the ultrasonic thickness gauge 2.

[0068] During this process, the protrusions evenly distributed along the trajectory inside the spiral groove exert a radial pushing effect on the moving rod 227 as it passes by, forcing it to gradually move inward toward the center of the pipe. This, in turn, drives the moving frame 225 and the probe to move radially closer to the pipe wall. The telescopic rod 235 extends and retracts while transmitting rotational power to adapt to radial displacement. Finally, with the assistance of the coupling agent, the probe accurately fits the pipe surface to complete the contact thickness measurement.

[0069] As the mounting bracket 112 continues to move along the spiral groove, the moving rod 227 is repeatedly pushed radially as it passes each protrusion, triggering the probe's "advance-fit measurement-retraction" action in sequence, realizing automatic and orderly detection of multiple measuring points. This process is carried out continuously along the spiral trajectory, covering the circumference and axis of the pipe, forming a spiral full-coverage scan. To further improve the integrity of the detection, the pipe on the rotating bracket 11 can be rotated to change its circumferential starting position, and with multiple scans, a more comprehensive uniformity assessment of the graphene coating on the pipe surface can be achieved.

[0070] Please refer to Figure 7 Since the probe end face of the ultrasonic thickness gauge 2 is flat, while the surface of the pipe to be measured is curved, the two are prone to tilting when they come into direct contact, which affects the transmission of sound waves and leads to unstable signals or measurement deviations. In order to improve the fit and reliability of the detection, a probe support component 3 is set on the outer periphery of the probe. It can adapt to the curved surface profile when the probe is pressed against the pipe, evenly distribute the contact pressure, improve the coupling effect and the stability of the thickness measurement data, and enhance the adaptability and accuracy of the detection.

[0071] For details, please refer to Figures 7-10The probe support assembly 3 includes a contact roller 31, which is rotatably mounted on the connecting frame 32. The feeding pipe 211 is an elastic telescopic pipe. The connecting frame 32 is hinged to the telescopic section of the feeding pipe 211 through a torsion spring shaft. Under the elastic preload of the torsion spring shaft, the connecting frame 32 drives the contact roller 31 to always tend to tilt away from the center of the probe, maintaining an outward-opening posture. When the probe is radially fed along the mounting frame 112, the contact roller 31 first contacts the outer wall of the pipe and rolls smoothly on its curved surface, providing guidance and support for the subsequent approach of the feeding pipe 211 and the probe, effectively reducing frictional resistance and positioning deviation.

[0072] Furthermore, symmetrical arc-shaped clamping plates 34 are provided on both sides of the probe circumference. An elastic telescopic plate 35 (in a compressed state) is connected to the side of the arc-shaped clamping plate 34 away from the probe. The other end of the elastic telescopic plate 35 is fixedly connected to the corresponding guide groove plate 213. When the guide groove plate 213 moves radially along the mounting plate 212, the elastic telescopic plate 35 moves synchronously and adaptively compensates by its moderate elastic telescopic capacity, ensuring that the arc-shaped clamping plate 34 can always apply a symmetrical and stable clamping force to the probe. At the same time, the inner surface of the arc-shaped clamping plate 34 can fit tightly against the outer ring surface of the probe. The inner surface of the arc-shaped clamping plate 34 can be made of a flexible material with a high coefficient of friction, such as rubber, to enhance the frictional resistance between it and the probe, effectively suppress the shaking of the probe during movement or measurement, and further improve its positioning accuracy and detection stability.

[0073] The feeding tube 211 adopts an elastic telescopic tube structure. During the testing process, regardless of whether the feeding tube 211 is in a retracted or extended state, the contact roller 31 maintains continuous contact with the curved surface of the tube, which not only plays a role in pre-positioning, but also provides mechanical support before and after the probe is in contact, preventing the probe from shaking or shifting.

[0074] In practical use (during operation), the pipe to be tested is placed on the support 11 of the testing platform 1. The left and right semi-circular frames 111 are slid together and closed, and the bolts are tightened, so that the ultrasonic thickness gauge 2 is positioned around the pipe. After the test is started, the drive motor 232 drives the rotating gear 231 and the external gear ring 234 to rotate, and the telescopic rod 235 pulls the mounting frame 112 to move along the spiral groove. When the moving rod 227 reaches the protrusion, it is pushed inward, which moves the probe closer to the pipe wall. Before contact, the moving frame 225 moves downward, and the abutment rod 226 pushes the push plate 221, which is squeezed by the pressure plate 218 to the liquid storage box 21. The coupling agent is released from the retracted feeding tube 2. 11 is precisely sprayed out, and then the push plate 221 continues to press down. The push rod 222 and the connecting column 219 drive the pressure ring 216 to move down. The pressure rod 217 triggers the linkage mechanism, causing the feeding tube 211 to swing outward to avoid the probe path. At the same time, the probe support component 3 first contacts the tube wall to provide flexible pre-support and ensure stable acoustic coupling. The probe then fits to complete single-point thickness measurement. The drive motor 232 runs intermittently and cooperates with the telescopic rod 235 to adaptively extend and retract, realizing multi-point scanning of the spiral trajectory. The system can obtain thickness data at multiple locations and can evaluate the uniformity of graphene coating spraying by analyzing the dispersion of thickness data at each measurement point.

[0075] Example 2, please refer to this example. Figure 11 .

[0076] The difference between this embodiment and Embodiment 1 is that the probe support assembly 3 includes elastic contact rods 33, which are evenly arranged circumferentially on the outside of the probe and fixed on the mounting plate 212. Each elastic contact rod 33 has a rubber pad at its end. The axial length of each elastic contact rod 33 is slightly greater than the extension length of the probe measuring end face. During the detection process, when the probe is fed radially toward the pipe surface, the rubber pad at the front end of the elastic contact rod 33 contacts the curved surface of the pipe before the probe. Through elastic deformation, it achieves adaptive fitting, effectively buffering the impact, eliminating local gaps, and providing pre-support before the probe contacts the pipe wall, significantly improving the stability of probe positioning.

[0077] It should be noted that, in the initial retracted state, the liquid outlet of the feeding pipe 211 is closer to the pipe surface than the elastic contact rod 33, so as to complete the pre-spraying of the coupling agent.

[0078] On the other hand, the present invention also provides a method for detecting the coating thickness of graphene coatings, applicable to equipment for detecting the coating thickness of graphene coatings, combined with... Figure 1 , Figure 2 , Figure 5 , Figure 7 and Figure 9 This includes the following steps:

[0079] Step 1: Place the pipe to be inspected on the support 11 on the inspection table 1, so that it is positioned between the semi-circular frames 111 on the left and right sides. Move the two sets of semi-circular frames 111 towards each other so that they are joined together to form a closed ring structure. At the same time, drive the ultrasonic thickness gauge 2 to be positioned on the outer periphery of the pipe.

[0080] Step 2: The ultrasonic thickness gauge 2 can move along the spiral groove track opened on the inner side of the semi-circular frame 111, and can move radially along the semi-circular frame 111 to approach the pipe. Before the probe contacts the pipe, the liquid storage box 21 accurately sprays the coupling agent to the corresponding detection area through the feeding pipe 211.

[0081] Step 3: Continue to advance the ultrasonic thickness gauge probe 2 radially. At this time, the probe support component 3 on its outer periphery will first contact the curved surface of the pipe and adapt to deformation, supporting the probe to stably fit the detection area and complete the single-point thickness measurement.

[0082] Step 4: After the test is completed, record the measurement point data, and continue to move the ultrasonic thickness gauge 2 along the spiral groove trajectory so that it continues to cover the pipe surface with a spiral trajectory, so as to realize continuous detection of the coating thickness.

Claims

1. A spray thickness detection apparatus for graphene paint, characterized by, The utility model relates to a kind of pipe surface graphene coating thickness measuring device, including: Half-round frame (111), the half-round frame (111) is equipped with left and right two groups, two can be spliced to form complete annular structure, and spiral groove is set in the inside of half-round frame (111); Ultrasonic thickness gauge (2), the ultrasonic thickness gauge (2) is set in the inside of half-round frame (111), and its probe is towards the central axis of half-round frame (111), and ultrasonic thickness gauge (2) is fixed on mounting bracket (112), and the telescopic end of telescopic rod (235) is fixedly connected with mounting bracket (112), and telescopic rod (235) is installed on outer gear ring (234), and outer gear ring (234) outside is engaged with rotating gear (231), and rotating gear (231) is connected with the output shaft of driving motor (232), and the probe is fixedly installed with moving frame (225), and the end of moving frame (225) away from probe is installed with moving rod (227) with radial sliding connection of mounting bracket (112), and moving rod (227) is embedded in the spiral groove of half-round frame (111) inner wall, and the spiral groove is evenly distributed with several protrusions along its spiral track in the spiral groove, and mounting bracket (112) can be stably moved along the track of spiral groove, and the probe of ultrasonic thickness gauge (2) can be moved radially close to pipeline while moving along the track of spiral groove, for the thickness measurement of pipe surface graphene coating; Liquid storage box (21), the liquid storage box (21) is set in the non-detection end of the probe of ultrasonic thickness gauge (2), and coupling agent is stored in its inside, and a plurality of swing type feeding tubes (211) are circumferentially arranged outside the probe, and feeding tube (211) is communicated with liquid storage box (21), and can accurately spray coupling agent to corresponding detection area before the probe contacts pipe surface; Probe support assembly (3), the probe support assembly (3) is arranged outside the probe, and can adapt to the curved surface profile when the probe is pressed to pipeline, and evenly disperses contact pressure; The bottom of the liquid storage box (21) is fixedly installed with mounting disc (212) sleeved outside the probe, and feeding tube (211) is hinged to mounting disc (212) through torsion spring rod, and the side of feeding tube (211) away from the probe is provided with guide slot plate (213) with radial sliding connection of mounting disc (212), and sliding rod is installed in feeding tube (211) middle, and guide slot plate (213) is hinged with linkage plate (214) at the end away from feeding tube (211), and the other end of linkage plate (214) is hinged to the outer periphery of mounting disc (212).

2. The graphene paint spraying thickness detecting apparatus according to claim 1, wherein The probe support assembly (3) includes contact roller (31), and contact roller (31) is rotatably installed on connecting frame (32), and feeding tube (211) is elastic telescopic tube, and connecting frame (32) is hinged to telescopic section of feeding tube (211) through torsion spring shaft.

3. The graphene paint spraying thickness detecting apparatus according to claim 1, wherein The probe support assembly (3) includes elastic contact rod (33), and elastic contact rod (33) is circumferentially and evenly arranged outside the probe, and rubber pad is arranged at the end of elastic contact rod (33).

4. The graphene paint spraying thickness detecting apparatus according to claim 2 or 3, characterized by, The linkage plate (214) is provided with a pressure plate (215) at one end away from the guide groove plate (213), the liquid storage box (21) is provided with an axially slidable pressure ring (216) outside the periphery, and the pressure ring (216) is provided with a pressure rod (217) matched with the corresponding pressure plate (215) at one side close to the mounting disc (212); The liquid storage box (21) is provided with a pressure plate (218) matched with the probe at the top, the pressure ring (216) is provided with a connecting column (219) uniformly distributed in the circumferential direction and matched with the pressure plate (218) in sliding, and the pressure plate (218) and the pressure ring (216) are connected with a connecting spring (220) sleeved outside the connecting column (219).

5. The graphene paint spraying thickness detecting apparatus according to claim 4, wherein The pressure plate (218) is provided with a push plate (221) at one side away from the liquid storage box (21), the push plate (221) is provided with a push rod (222), the push rod (222) penetrates through the pressure plate (218) and is matched with the connecting column (219) in sliding, the push rod (222) is sleeved with a pressing spring (223) outside, the mounting frame (112) is fixedly provided with an elastic telescopic column (224) inside, and the telescopic section of the elastic telescopic column (224) is fixedly connected with the push plate (221) and is connected with the pressure plate (218) in sliding.

6. The graphene paint spraying thickness detecting apparatus according to claim 5, wherein The moving frame (225) is provided with a resisting rod (226) for pushing the push plate (221).

7. The graphene paint spraying thickness detecting apparatus according to claim 1, wherein The guide groove plate (213) is provided with an elastic telescopic plate (35) at one side close to the central axis of the mounting disc (212), the telescopic end of the elastic telescopic plate (35) is fixedly connected with an arc-shaped clamping plate (34), and the arc-shaped clamping plate (34) can exert a stable clamping force on the probe.

8. A method for detecting the spray thickness of graphene paint, suitable for the graphene paint spray thickness detection device of claim 1, characterized in that, The method comprises the following steps: Step one: place the pipeline to be detected on the detection table (1) between the left and right semicircular frames (111), move the left and right semicircular frames (111) towards each other, so that they are combined to form a closed annular structure, and simultaneously drive the ultrasonic thickness gauge (2) to be in position to the outer periphery of the pipeline; Step two: the ultrasonic thickness gauge (2) can move along the spiral groove track formed in the inner side of the semicircular frame (111) and can move radially to approach the pipeline, before the probe contacts the pipeline, the liquid storage box (21) sprays the coupling agent to the corresponding detection area through the feeding pipe (211); Step three: continue to advance the probe of the ultrasonic thickness gauge (2) in the radial direction, at this time, the probe support assembly (3) on the outer periphery of the probe first contacts the curved surface of the pipeline and deforms adaptively to support the probe to stably adhere to the detection area, and single-point thickness measurement is completed; Step four: after detection, record the measurement point data, and continue to move the ultrasonic thickness gauge (2) along the spiral groove track, so that it continues to cover the surface of the pipeline in a spiral track, and realizes continuous multi-point detection of the sprayed thickness.

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