Temperature-sensitive coating detection method for rotating machinery

Abstract

The invention discloses a method for detecting a temperature-sensitive coating of a rotary machine, which comprises the following steps: adding fluorescent carbon dots with different masses into a polyether-ether-ketone dispersion liquid as solutes to form a mixed solution, and judging whether the mixed solution has an excitation color of pure fluorescent carbon dots under irradiation excitation of an ultraviolet light source; firing the mixed solution into a composite coating; heating the composite coating by using a heating device; measuring photoluminescence spectrograms of the composite coating at different temperatures; photoluminescence images of the composite coating at different temperatures are shot; and the temperature of the composite coating and the temperature of the rotary machine are calculated through RGB under the ultraviolet excitation condition. According to the invention, the surface temperature of the rotating machine is reflected by calculating the RGB by utilizing the fluorescence property which is excited by the composite coating under the ultraviolet light source and changes along with the temperature, so that the detection cost can be greatly reduced, and the temperature change of the rotating machine can be monitored in real time, thereby judging the wear degree and improving the safety and reliability of equipment in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotating machinery temperature detection, and in particular to a temperature-sensitive coating detection method for rotating machinery. BACKGROUND

[0002] Frictional interface heating and wear in fluid machinery are common problems that not only affect the efficiency and service life of the equipment, but also can cause serious failures. The problems caused by heating and wear currently mainly include the following aspects: 1. Efficiency reduction: The increased energy loss due to heating directly leads to a decrease in the overall efficiency of the mechanical system. For example, in wind turbines or water turbines, excessive wear of bearings or gearboxes can lead to a decrease in transmission efficiency.

[0003] 2. Material fatigue and damage: High temperatures and continuous friction can accelerate material fatigue, leading to early failure of the part.

[0004] 3. Lubrication failure: In many machines such as engines, compressors, etc., lubricants are used to reduce friction between moving parts. If the temperature is too high, the lubricant may degrade or evaporate, losing its protective effect and further exacerbating wear.

[0005] 4. Performance instability: Wear can increase the clearance between mechanical parts, affecting the working accuracy and stability of the machine. In precision machining equipment, these changes can lead to a decrease in product quality, an increase in maintenance costs, and frequent wear that requires regular replacement of parts, which not only increases maintenance costs but also affects production efficiency due to extended downtime.

[0006] 5. Safety hazards: In extreme cases, severe wear and overheating can cause mechanical failure, leading to accidents.

[0007] 6. Challenges in monitoring: During operation, the frictional interface inside the fluid machinery is usually closed and cannot be directly observed by the naked eye. The wear condition cannot be monitored in real time, which can lead to sudden equipment failure or unplanned downtime. SUMMARY

[0008] The present application aims to provide a temperature-sensitive coating detection method for rotating machinery to address the shortcomings of the prior art. The detection method is simple, and the composite coating emits fluorescence that changes with temperature under ultraviolet light. By calculating RGB, the surface temperature of the rotating machinery can be reflected. This not only greatly reduces the detection cost but also allows real-time monitoring of temperature changes in the rotating machinery, thereby determining the degree of wear and improving the safety and reliability of the equipment during use.

[0009] To solve the above technical problems, the present application adopts the following technical scheme: A temperature-sensitive coating detection method of a rotating machine, characterized in that it comprises the following steps: S1, adding different quality fluorescent carbon dots as solutes into polyether ether ketone dispersion liquid to form a mixed solution, and judging whether the mixed solution is excited to the excitation color of pure fluorescent carbon dots under the irradiation of an ultraviolet light source; S2, firing the mixed solution into a composite coating; S3, heating the composite coating using a heating device; S4, measuring the photoluminescence spectrum of the composite coating at different temperatures; S5, taking a photoluminescence image of the composite coating at different temperatures; S6, calculating the temperature of the composite coating and the temperature of the rotating machine under the condition of ultraviolet excitation.

[0010] The detection method has simple steps, uses the fluorescent performance of the composite coating excited by the ultraviolet light source and changes with temperature, and reflects the surface temperature of the rotating machine by calculating RGB, so that the detection cost can be greatly reduced, the temperature change of the rotating machine can be monitored in real time, the wear degree can be judged, and the safety and reliability of the equipment during use can be improved.

[0011] Further, when judging whether the mixed solution is excited to the excitation color of pure fluorescent carbon dots under the irradiation of an ultraviolet light source in step S1, if not, the fluorescent carbon dots are replaced, and if yes, the mixed solution is used.

[0012] Further, the mixed solution is excited to the excitation color of pure fluorescent carbon dots under the irradiation of an ultraviolet light source, that is, the fluorescent carbon dots are in a non-quenching state in the polyether ether ketone, which is used to configure mixed solutions with different concentrations, and if the fluorescent carbon dots are in a quenching state, the fluorescent carbon dots are reselected.

[0013] Further, when the mixed solution is fired into a composite coating in step S2, the following steps are specifically included: S2.1, selecting a friction pair and cleaning it with ultrasonic waves for 10-15 minutes; S2.2, then performing sand blasting treatment on the friction pair using diamond sand, the pressure of the sand blasting is 0.4-0.45 MPa, and the distance between the nozzle and the friction pair is 150-200 mm; S2.3, after the sand blasting is completed, cleaning the friction pair with ultrasonic waves for 10-15 minutes and placing it in an oven for drying; S2.4, taking 10-15 mL of water-based dispersion liquid for stirring, adding 100-120 mg of cadmium sulfide to the water-based dispersion liquid, and continuing to stir to uniformly disperse the cadmium sulfide in the water-based dispersion liquid to form a water-based mixed liquid; S2.5, transferring the water-based mixed liquid to a spray cup and spraying it on the pretreated friction pair through a spray gun, the working pressure of the spray gun is 0.3-0.4 MPa, the spraying distance is 100-150 mm, and the spraying is repeated three times to form a uniform composite coating. S2.6 Put the friction pair sprayed with the composite coating into an oven, dry at a temperature of 150-180 DEG C for 25-30 min, and then heat to 425-450 DEG C for 10-15 min.

[0014] Further, the friction pair adopts a 304 stainless steel 30*30mm base.

[0015] Further, the working temperature of the oven in step S2.3 is 150-180 DEG C, and the drying time is 20-30 min.

[0016] Further, the water-based dispersion liquid in step S2.4 is stirred by a magnetic stirrer at a speed of 600-800 r / min for 10-15 min, and after adding the cadmium sulfide, it is stirred by a magnetic stirrer at a speed of 600-800 r / min for 30-40 min.

[0017] Further, the heating device of step S3 includes a sample table, a heating cavity and a shell, the shell is provided with a control panel, the heating cavity is located in the shell, a temperature sensor is arranged in the heating cavity, the sample table is located in the heating cavity, and a heating assembly is arranged on the sample table.

[0018] Further, the sample table is connected to a fluorescence spectrometer, and the fluorescence spectrometer is provided with a xenon lamp and an ultraviolet xenon flash lamp tube for continuous excitation.

[0019] Further, the heating assembly is an infrared heating pipe or a resistance wire, and the working range of the heating assembly is 25-200 DEG C.

[0020] The present application has the following beneficial effects due to the adoption of the above technical scheme: The detection method of the present application is simple, the fluorescence performance of the composite coating excited under the ultraviolet light source changes with temperature, the surface temperature of the rotating machinery is reflected by calculating RGB, not only the detection cost can be greatly reduced, but also the temperature change of the rotating machinery can be monitored in real time, so as to judge the wear degree and improve the safety and reliability of the equipment in use. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in combination with the drawings: Figure 1 The flow chart of the temperature-sensitive coating detection method of the rotating machinery of the present application; Figure 2 The flow chart of the mixed solution burned into the composite coating in the present application; Figure 3 The block diagram of the detection method in the present application; Figure 4 The block diagram of the heating device in the present application; Figure 5A photoluminescence spectrum of the composite coating in the present application in the range of 50℃-120℃; Figure 6 A temperature variation diagram of the fluorescence intensity in 5 continuous heating / cooling cycles in the present application; Figure 7 A photoluminescence diagram at different temperatures (50℃, 70℃, 80℃, 100℃) in the present application; Figure 8 A photoluminescence diagram at different temperatures (50℃, 70℃, 80℃, 100℃) in the present application.

[0022] In the figure: 1-outer shell; 2-control panel; 3-heating cavity; 4-temperature sensor; 5-sample table; 6-heating assembly. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] In order to enable those skilled in the art to better understand the present application scheme, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0026] As Figures 1 to 3 shown, a temperature-sensitive coating detection method of a rotating machine, comprising the following steps: S1, adding different quality of fluorescent carbon dots as solute into polyether ether ketone dispersion solution to form a mixed solution, and determining whether the mixed solution shows the excitation color of pure fluorescent carbon dots under the excitation of ultraviolet light source.

[0027] When determining whether the mixed solution shows the excitation color of pure fluorescent carbon dots under the excitation of ultraviolet light source, if not, replace the fluorescent carbon dots, if yes, use the mixed solution.

[0028] The mixed solution shows pure fluorescent carbon dots under the excitation of ultraviolet light source, i.e. the fluorescent carbon dots are in non-quenching state in polyether ether ketone, which is used to configure mixed solutions with different concentrations, if in quenching state, reselect fluorescent carbon dots.

[0029] S2, firing the mixed solution into a composite coating.

[0030] The step of firing the mixed solution into a composite coating specifically includes the following steps: S2.1 selecting a friction pair, the friction pair adopts a 304 stainless steel 30*30mm base, and is cleaned by ultrasonic wave for 10-15min; S2.2 then sandblasting treatment is performed by adopting 100-mesh corundum, the pressure of sandblasting is 0.4-0.45MPa, and the distance between the nozzle and the friction pair is 150-200mm; S2.3 after the sandblasting is completed, ultrasonic cleaning is performed for 10-15min, and drying is performed by placing in an oven, the working temperature of the oven is 150-180℃, and the drying time is 20-30min; S2.4 taking 10-15mL of the water-based PEEK dispersion liquid to stir, adding 100-120mg of cadmium sulfide thereto, and continuing to stir to uniformly disperse the cadmium sulfide in the water-based dispersion liquid to form a water-based PEEK mixed liquid; The water-based dispersion liquid is stirred by a magnetic stirrer at a rotating speed of 600-800r / min for 10-15min, and after the cadmium sulfide is added, the stirring is performed by the magnetic stirrer at a rotating speed of 600-800r / min for 30-40min.

[0031] S2.5 transferring the water-based PEEK mixed liquid to a spray cup, and spraying on the pretreated friction pair by a spray gun, the working pressure of the spray gun is 0.3-0.4MPa, the spraying distance is 100-150mm, and the spraying is repeated three times to form a uniform composite coating; S2.6 placing the friction pair sprayed with the composite coating into an oven, drying at a temperature of 150-180℃ for 25-30min, and then increasing the temperature to 425-450℃ for 10-15min to promote the solidification and performance optimization of the composite coating.

[0032] S3, heating the composite coating by using a heating device.

[0033] The heating device includes a sample table 5, a heating cavity 3 and an outer shell 1, the outer shell 1 is provided with a control panel 2, the control panel 2 is used for setting temperature, time and alarm and the like, the heating cavity 3 is located in the outer shell 1, a temperature sensor 4 is arranged in the heating cavity 3, the temperature sensor 4 is used for feedback control to a PID, the heating cavity is a constant temperature environment, the sample table 5 is located in the heating cavity 3, the sample table 5 can rotate or translate, and a heating assembly 6 is arranged on the sample table 5.

[0034] The sample table 5 is connected to a fluorescence spectrometer, the fluorescence spectrometer can adopt a FL3-211 fluorescence spectrometer, the fluorescence spectrometer is provided with a 450W xenon lamp and an ultraviolet xenon flash lamp tube for continuous excitation.

[0035] The heating component 6 is an infrared heating tube or a resistance wire, and the working range of the heating component 6 is 25-200℃.

[0036] S4, the photoluminescence spectrum of the composite coating at different temperatures is measured.

[0037] As shown in Figure 5 , the relationship between the PL intensity and the temperature change is recorded, and according to Figure 5 , it can be known that the green fluorescence of the composite coating gradually decreases with the increase of the temperature, which proves the dependence on the temperature.

[0038] As shown in Figure 6 , the relationship between the fluorescence intensity of the composite coating and the temperature change during the heating and cooling cycle is recorded, and the change of the fluorescence intensity shows high consistency and repeatability in multiple heating and cooling cycles, and according to Figure 6 , it can be known that the reproducibility of the temperature is calculated as 98.01%, and the maximum experimental deviation is not higher than 2%, which proves that the composite coating is very stable.

[0039] S5, the photoluminescence image of the composite coating at different temperatures is taken.

[0040] As shown in Figure 7 , the image of the composite coating at 50-120℃ under 365nm excitation, at 50℃, the green fluorescence of the composite coating can be obviously seen, and with the increase of the temperature, the green fluorescence gradually becomes lighter, which can be seen by the naked eye.

[0041] As shown in Figure 8 , the left image in Figure 8 a is the photo of the composite coating under the ultraviolet lamp, which presents green fluorescence, Figure 8 the middle image in Figure 8 a is the composite coating taken out after boiling, the green fluorescence is weak, and with the decrease of the temperature of the composite coating, the green fluorescence is restored, as shown in the right image in Figure 8 a. Figure 8 b, Figure 8 c, Figure 8 e, the composite coating can still restore the green fluorescence after being heated and cooled for 4 times, which represents high stability.

[0042] S6, the temperature of the composite coating and the rotating machine under the condition of ultraviolet excitation is calculated by RGB, and the relationship between RGB and the temperature of the composite coating is shown in Table 1.

[0043] Table 1 Corresponding table of RGB and the temperature of the composite coating From table 1, the last column is the temperature of the composite coating, taking 50℃ as an example, the first three columns of the table are BGR. For the photos of the composite coating at different temperatures, the quantitative values of the three channels of RGB cannot be obtained after image processing, and the temperature value of the composite coating is obtained from the RGB data, wherein the red (R) and blue (B) components are enhanced with the increase of the temperature (for example, when the temperature is 80℃, the R value rises significantly, so that the green vision is neutralized.

[0044] The detection method is simple in steps, uses the fluorescent performance of the composite coating excited under the ultraviolet light source and changes with the temperature, reflects the surface temperature of the rotating machinery by calculating RGB, can greatly reduce the detection cost, can monitor the temperature change of the rotating machinery in real time, thereby judges the wear degree, and improves the safety and reliability of the equipment in use.

[0045] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to achieve basically the same technical effect is covered by the protection scope of the present application.

Claims

1. A method of detecting a temperature-sensitive coating of a rotating machine, characterized by It comprises the following steps: S1, adding different quality fluorescent carbon dots as solute into polyether ether ketone dispersion solution to form a mixed solution, and determining whether the mixed solution is excited to the excitation color of pure fluorescent carbon dots under the irradiation of ultraviolet light source; S2, the mixed solution is fired into a composite coating; S3, heating the composite coating using a heating device; S4, measuring the photoluminescence spectrum of the composite coating at different temperatures; S5, taking the photoluminescence picture of the composite coating at different temperatures; S6, under the condition of ultraviolet excitation, the temperature of the composite coating and the rotating machinery is calculated by RGB.

2. A method of detecting a temperature-sensitive coating of a rotating machine according to claim 1, characterized in that: In step S1, if the mixed solution is not excited to the excitation color of pure fluorescent carbon dots under the irradiation of ultraviolet light source, replace the fluorescent carbon dots, if yes, use the mixed solution.

3. A method of detecting a temperature-sensitive coating of a rotating machine according to claim 2, characterized in that: The mixed solution is excited to the excitation color of pure fluorescent carbon dots under the irradiation of ultraviolet light source, that is, the fluorescent carbon dots are not quenched in polyether ether ketone, which is used to configure mixed solutions with different concentrations, if it is in the quenched state, select the fluorescent carbon dots again.

4. The method of claim 1, wherein: In step S2, the mixed solution is fired into a composite coating, which comprises the following steps: S2.1 select the friction pair, and clean it with ultrasonic wave for 10-15 min; S2.2 then use emery sand to spray sand treatment, the pressure of sand spraying is 0.4-0.45 MPa, the distance between the nozzle and the friction pair is 150-200 mm; S2.3 after sand spraying, clean it with ultrasonic wave for 10-15 min, and put it into the oven for drying; S2.4 take 10-15 mL of water-based dispersion solution for stirring, add 100-120 mg of cadmium sulfide to it, and continue to stir to make the cadmium sulfide uniformly dispersed in the water-based dispersion solution to form a water-based mixed solution; S2.5 transfer the water-based mixed solution to the spray cup, and spray it on the pretreated friction pair through the spray gun, the working pressure of the spray gun is 0.3-0.4 MPa, the spraying distance is 100-150 mm, and repeat the spraying three times to form a uniform composite coating; S2.6 put the friction pair with the composite coating into the oven, first dry it at a temperature of 150-180℃ for 25-30 min, and then heat it to 425-450℃ for 10-15 min.

5. A method of detecting a temperature-sensitive coating of a rotating machine according to claim 4, characterized in that: The friction pair uses 304 stainless steel 30*30mm base.

6. A method of detecting a temperature-sensitive coating of a rotating machine according to claim 4, characterized in that: The working temperature of the oven in step S2.3 is 150-180℃, and the drying time is 20-30 min.

7. A method of detecting a temperature-sensitive coating of a rotating machine according to claim 4, characterized in that: The water-based dispersion solution in step S2.4 is stirred by a magnetic stirrer at a speed of 600-800 r / min for 10-15 min, and after adding cadmium sulfide, it is stirred by a magnetic stirrer at a speed of 600-800 r / min for 30-40 min.

8. The method of claim 1, wherein: The heating device in step S3 comprises a sample stage, a heating cavity and an outer shell, a control panel is arranged on the outer shell, the heating cavity is located in the outer shell, a temperature sensor is arranged in the heating cavity, the sample stage is located in the heating cavity, and a heating assembly is arranged on the sample stage.

9. A method of inspecting a temperature-sensitive coating of a rotating machine as recited in claim 8, wherein: The sample stage is connected to a fluorescence spectrometer, the fluorescence spectrometer is provided with a xenon lamp and an ultraviolet xenon flash lamp tube for continuous excitation.

10. A method of inspecting a temperature-sensitive coating of a rotating machine as recited in claim 8, wherein: The heating assembly is an infrared heating pipe or a resistance wire, and the working range of the heating assembly is 25-200℃.

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