Testing device for analyzing resistance reduction and scouring resistance of coating

Abstract

The utility model provides a testing device for coating resistance reduction and scouring resistance analysis, which comprises a water storage tank, a testing platform, a coating carrier, two water pressure measuring meters and a data processing device, and is characterized in that the water storage tank is communicated with a liquid flow channel on the testing platform through a first pipeline and a second pipeline to construct a circulating water loop; the horizontal groove for placing the coating carrier is formed in the lower wall of the liquid flow channel, so that the upper surface of the coating carrier becomes a part of the liquid flow channel, water flow can directly flow through the surface of the coating during testing, and the water pressure of the coating can be measured through the water pressure measuring meters at the two ends of the coating, so that the pressure difference between the two ends of the coating is obtained; and the resistance value of the coating is calculated through the pressure difference. The testing device disclosed by the utility model is simple in design and convenient to maintain, can quickly, accurately, simply and conveniently test the drag reduction effect of the coating carrier coated with paint, and effectively overcomes the defects of difficult experimental environment construction, complex design and the like in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of drag reduction testing, in particular to a testing device for analyzing the drag reduction and scour resistance performance of coatings. Background Art

[0002] Hull drag reduction has a significant impact on improving ship performance and economic benefits, and fluid resistance plays an important role as a core parameter. Fluid resistance testing can not only help evaluate ship coating performance, but also provide strong data support for ship design and optimization, which helps to reduce costs, improve economic benefits, and ensure navigation safety. Designing and developing efficient coating fluid resistance testing equipment is undoubtedly a crucial task.

[0003] There are many types of coating fluid resistance test devices, the most common ones include towing type, flat plate type, pipeline type, etc. These devices evaluate the performance of the coating material by applying fluid to the coating material and measuring the resistance of the fluid when passing through the coating. However, there are also some shortcomings in the coating fluid resistance test device. For example, the towing fluid resistance test device, such as the Chinese utility model patent CN202041366U discloses a towing fluid resistance test device, which does not consider the friction problem between the towing plate and the test model, affecting the measurement accuracy; the flat plate coating fluid resistance test device, such as the Chinese utility model patent CN105387993A discloses a flat surface fluid resistance performance test device, the flow rate is small and cannot be adjusted; the pipeline coating fluid resistance test device, such as the Chinese utility model patent CN211717689U discloses a fully automatic coil model fluid resistance test device, the device design is relatively complex, and the water flow stability is insufficient. In summary, the coating fluid resistance test device plays an important role in evaluating drag reduction performance, but it still needs to be improved and perfected. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a test device for coating drag reduction and scour resistance performance analysis. The water storage tank and the liquid flow path on the test platform are connected through a first pipe and a second pipe to construct a circulating water loop. A horizontal groove for placing the coating carrier is provided on the lower wall of the liquid flow path, so that the upper surface of the coating carrier becomes a part of the liquid flow path. During the test, the water flow can directly flow through the coating surface. The water pressure passing through the coating can be measured by the water pressure measuring gauges at both ends of the coating to obtain the resistance value. The test device of the utility model has a simple structure and a visible structural process. It can test the effects of different coating thicknesses, coating roughness, elastic modulus, and water flow velocity on coating resistance.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A testing device for analyzing the drag reduction and scour resistance performance of a coating, comprising:

[0007] A water storage tank, with a first water outlet and a first water inlet disposed on the side wall;

[0008] The test platform has a second water outlet and a second water inlet respectively disposed on both sides of the bottom, the second water inlet is connected to the first water outlet through a first pipe, the second water outlet is connected to the first water inlet through a second pipe, a liquid flow channel connecting the second water outlet and the second water inlet is disposed in the inner cavity of the test platform, and a horizontal groove is disposed on the lower wall of the liquid flow channel;

[0009] A coating carrier, the upper surface of which is coated with a coating material, the coating carrier is installed in the horizontal groove and the shape and size of the coating carrier are adapted to the horizontal groove, so that the upper surface of the coating carrier is flush with the lower inner wall of the liquid flow channel, and the upper surface of the coating carrier becomes a part of the liquid flow channel; and

[0010] Two water pressure measuring gauges are installed on the test platform and are respectively located at the two ends of the coating carrier, and are used to monitor the pressure difference after water flows through the coating material.

[0011] Furthermore, a cavity structure is provided in the middle of the test platform above the liquid flow channel, and a sealing device made of a transparent material is installed in the cavity structure to constitute an observation window for the coating carrier.

[0012] Furthermore, the sealing device consists of a blocking end and an observation end, the size and shape of the blocking end are adapted to the cavity structure, the bottom of the blocking end is flush with the upper inner wall of the liquid flow channel, so that the bottom of the blocking end becomes a part of the liquid flow channel, and the observation end is installed on the top of the blocking end and has a cross-sectional size larger than the cross-sectional size of the blocking end and smaller than the cross-sectional size of the test platform.

[0013] Furthermore, the sealing device is an acrylic plate.

[0014] Furthermore, two mounting holes connected to the liquid flow channel are provided at the bottom of the test platform at both ends of the coating carrier, and the test end of the water pressure measuring gauge extends from the mounting hole into the liquid flow channel and blocks the mounting hole.

[0015] Furthermore, the coating carrier is a glass slide.

[0016] Furthermore, the testing device also includes a data processing device connected to the water pressure measuring meter for displaying coating resistance data.

[0017] Furthermore, a flow regulating valve and a power device are installed on the first pipeline.

[0018] Furthermore, a flow meter connected to the data processing device is installed at one end of the first pipeline close to the second water inlet, and the power device is a water pump and a water pressure gauge installed in the middle of the first pipeline.

[0019] Furthermore, the first pipeline and the second pipeline are both two straight pipes consisting of a horizontal pipe and a vertical pipe connected to each other.

[0020] The beneficial effects of the utility model are:

[0021] 1. The utility model connects the water storage tank and the liquid flow channel on the test platform through the first pipe and the second pipe, constructs a circulating water loop, can realize continuous and stable fluid supply, and ensure the accuracy and reliability of the test data; by setting a horizontal groove for placing the coating carrier on the lower wall of the liquid flow channel, the upper surface of the coating carrier is flush with the lower inner wall of the liquid flow channel and thus becomes a part of the liquid flow channel. During the test, the water flow can directly flow through the coating surface. By setting a water pressure measuring gauge at both ends of the coating, the water pressure before and after the water flow passes through the coating can be measured, so as to obtain the pressure difference at both ends of the coating, and the resistance value of the coating can be calculated by the pressure difference. By setting the horizontal groove as a horizontal structure, the influence of the height difference on the water pressure can be avoided. By placing the coating carrier in the horizontal groove, the coating carrier can be easily replaced to realize the testing of different coatings. The test device of the utility model is simple in design and easy to maintain. It can quickly, accurately and easily test the drag reduction effect of the coating carrier after coating, and effectively solves the defects of the prior art such as the difficulty in constructing the experimental environment and the complex design.

[0022] 2. The test device of the utility model has a simple structure. By installing the sealing device in the cavity structure above the liquid flow channel, on the one hand, the bottom of the sealing device becomes a part of the liquid flow channel, which can prevent water in the liquid flow channel from splashing out. On the other hand, the sealing device is made of transparent materials such as acrylic plates, and the water flow state and the dynamic changes of the surface coating on the coating carrier can be observed directly through the sealing device above the test device, so that the test process can be visualized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a test device for analyzing the drag reduction and scour resistance performance of a coating according to the utility model;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the test platform of the utility model.

[0025] Reference numerals:

[0026] 10-water storage tank, 11-first water outlet, 12-first water inlet, 13-first pipeline, 14-second pipeline, 15-flow regulating valve, 16-flow meter, 17-water pump, 18-water pressure gauge, 20-test platform, 21-second water outlet, 22-second water inlet, 23-liquid flow channel, 24-horizontal groove, 25-mounting hole, 30-coating carrier, 40-water pressure measuring gauge, 50-data processing device, 60-sealing device, 61-blocking end, 62-observation end. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 and Figure 2 As shown, the utility model provides a testing device for analyzing the drag reduction and scour resistance performance of a coating, comprising:

[0031] The water storage tank 10 has a first water outlet 11 and a first water inlet 12 disposed on its side wall;

[0032] The test platform 20 has a second water outlet 21 and a second water inlet 22 respectively disposed on both sides of the bottom, the second water inlet 22 is connected to the first water outlet 11 through the first pipe 13, the second water outlet 21 is connected to the first water inlet 12 through the second pipe 14, and a liquid flow channel 23 connecting the second water outlet 21 and the second water inlet 22 is disposed in the inner cavity of the test platform 20, and a horizontal groove 24 is disposed on the lower wall of the liquid flow channel 23;

[0033] A coating carrier 30, the upper surface of which is coated with a coating material, is installed in the horizontal groove 24 and has a shape and size that matches the horizontal groove 24, so that the upper surface of the coating carrier 30 is flush with the lower inner wall of the liquid flow channel 23, and the upper surface of the coating carrier 30 becomes a part of the liquid flow channel 23; and

[0034] Two water pressure measuring gauges 40 are installed on the test platform 20 and are respectively located at two ends of the coating carrier 30, and are used to monitor the pressure difference after water flows through the coating material.

[0035] The utility model has a simple structure and is easy to operate. The water tank 10 and the liquid flow channel 23 on the test platform 20 are connected through the first pipe 13 and the second pipe 14. The water in the water tank 10 flows out from the first water outlet 11, flows into the liquid flow channel 23 through the first pipe 13 and the second water inlet 22, and then flows back to the water tank 10 from the first water inlet 12 through the second water outlet 21 and the second pipe 14, thereby constructing a circulating water loop, which can realize continuous and stable fluid supply and ensure the accuracy and reliability of the test data; by arranging a horizontal groove 24 for placing the coating carrier 30 on the lower wall of the liquid flow channel 23, the upper surface of the coating carrier 30 is flush with the lower inner wall of the liquid flow channel 23, thereby becoming a part of the liquid flow channel 23. During the test, the water flow can directly flow through the coating surface. By arranging water pressure measuring gauges 40 at both ends of the coating, the water pressure before and after the water flow passes through the coating can be measured, thereby obtaining the pressure difference at both ends of the coating, and calculating the resistance value of the coating through the pressure difference. By setting the horizontal groove 24 as a horizontal structure, the influence of the height difference on the water pressure can be avoided, and the accuracy of the test result can be improved. By placing the coating carrier 30 in the horizontal groove 24, the coating carrier 30 can be easily replaced to test different coatings. The test device of the utility model is simple in design and easy to maintain. It can quickly, accurately and easily test the drag reduction effect of the coating carrier 30 after coating, and effectively solves the defects of the prior art such as the difficulty of constructing the experimental environment and the complex design.

[0036] In some embodiments, Figure 1 and Figure 2As shown, the middle of the test platform 20 is located above the liquid flow channel 23 and is a cavity structure, and a sealing device 60 made of a transparent material is installed in the cavity structure, forming an observation window of the coating carrier 30. Specifically, the sealing device 60 is composed of a blocking end 61 and an observation end 62. The size and shape of the blocking end 61 are adapted to the cavity structure, so that the blocking end 61 can completely block the cavity structure, and the bottom of the blocking end 61 is flush with the upper inner wall of the liquid flow channel 23, so that the bottom of the blocking end 61 becomes a part of the liquid flow channel 23. The observation end 62 is installed on the top of the blocking end 61 and has a cross-sectional size larger than the cross-sectional size of the blocking end 61 and smaller than the cross-sectional size of the test platform 20, so that the observation end 62 can be placed on the test platform 20 and the blocking end 61 will not fall into the liquid flow channel 23. By providing the sealing device 60, on the one hand, the bottom of the blocking end 61 becomes a part of the liquid flow channel 23, which can prevent water in the liquid flow channel 23 from splashing out. On the other hand, the sealing device 60 is made of a transparent material, and the water flow state and the dynamic changes of the surface coating on the coating carrier 30 can be observed directly through the sealing device 60 above the test device, so that the test process can be visualized.

[0037] As a preferred embodiment, in order to facilitate processing and molding, the sealing device 60 is an acrylic plate.

[0038] In some embodiments, Figure 2 As shown, two mounting holes 25 connected to the liquid flow channel 23 are provided at the bottom of the test platform 20 at both ends of the coating carrier 30, and the test ends of two water pressure measuring gauges 40 extend into the liquid flow channel 23 through the mounting holes 25 from the bottom of the test platform 20. The shape of the test end is adapted to the size of the mounting holes 25. On the one hand, the water pressure in the liquid flow channel 23 can be measured, and on the other hand, the mounting holes 25 can be blocked to prevent water from flowing out.

[0039] In some embodiments, the coating carrier 30 is a common glass slide sold on the market, and the shape of the horizontal groove 24 matches the shape of the glass slide. After the coating material is coated on the upper surface of the glass slide, the bottom of the glass slide is fixed in the horizontal groove 24 by double-sided tape or the like. The depth of the horizontal groove is consistent with the thickness of the glass slide, so that after the glass slide is fixed in the horizontal groove 24, the upper surface of the glass slide is flush with the lower inner wall of the liquid flow channel 23, and the glass slide becomes a part of the liquid flow channel 23. The glass slide is of standard size and can perfectly match the size of the horizontal groove 24, thereby improving the test accuracy of the coating drag reduction performance test, and the glass slide is inexpensive and easy to obtain, which can reduce the test cost.

[0040] In some embodiments, Figure 1As shown, the first pipe 13 and the second pipe 14 are both two straight pipes consisting of a horizontal pipe and a vertical pipe connected to each other, which can reduce the flow channel bending and local resistance and improve the accuracy of the test.

[0041] In some embodiments, Figure 2 As shown, the test device further includes a data processing device 50 connected to the water pressure measuring gauge 40 for displaying the coating resistance data. The two water pressure measuring gauges 40 are connected to the data processing device 50, and the data of the water pressure measuring gauges 40 are converted into resistance data after being processed by the data processing device 50 and displayed on the data processing device 50, so that the test results can be visualized.

[0042] In some embodiments, Figure 1 As shown, a flow regulating valve 15 and a power device are installed at one end of the first pipe 13 near the first water outlet 11, and a flow meter 16 connected to the data processing device 50 is installed at one end near the second water inlet 22. The power device is a water pump 17 and a water pressure gauge 18 installed in the middle of the first pipe 13. The flow regulating valve 15 can adjust the flow rate of water to meet different test requirements, the water pump 17 can provide power for the flow of water, the water pressure gauge 18 can obtain the real-time water pressure in the first pipe 13, and the flow meter 16 can obtain the real-time water flow size in the first pipe 13 in real time, so as to facilitate the control of the flow regulating valve 15.

[0043] In some embodiments, Figure 2 As shown, the data processing device 50 is provided with a display screen, which can display the real-time water pressure data of the two water pressure measuring meters 40, the coating resistance data and the water flow size data after being processed by the data processing device 50.

[0044] The utility model provides a testing method for a testing device for analyzing the drag reduction and scour resistance performance of a coating, which specifically comprises the following steps:

[0045] S1, coating the coating material with an initial thickness on the upper surface of the coating carrier 30, and installing the coating carrier 30 in the horizontal groove 24; due to working conditions, the initial thickness of the coating should not be too thin, and 300 μm is the best initial thickness.

[0046] S2, adjusting the water velocity through the flow regulating valve 15, recording the pressure difference of the two water pressure measuring gauges 40 at different water velocities, and obtaining the relationship between the water velocity and the resistance.

[0047] Resistance F=ΔP×S, where ΔP is the pressure difference between the two water pressure gauges 40 , ΔP>0, and S is the coating area on the upper surface of the coating carrier 30 .

[0048] The water speed range is 10~20 m / s. During the test, the initial water speed is set to 10 m / s, and then increased by 1 m / s in sequence. The water speed is adjusted to 10 m / s, 11 m / s...20 m / s in sequence, and the pressure difference under different water speed conditions is recorded respectively. The data processing device 50 converts it into the resistance value of the coating, and then the relationship between the water speed and the resistance is obtained.

[0049] S3, grinding the coating on the upper surface of the coating carrier 30 to different degrees of roughness, and then repeating step S2 to obtain the relationship between the coating roughness and the resistance. As a preferred embodiment, four different roughnesses can be selected for testing.

[0050] S4, continue coating the upper surface of the coating carrier 30 to obtain coating materials of different thicknesses, and then repeat steps S2 and S3 to obtain the relationship between the coating thickness and the resistance.

[0051] When testing, the coating thickness ranged from 300μm to 1800μm. The initial thickness of the coating was set to 300μm, and each subsequent spraying uniformly increased the coating by 300~350μm to obtain the relationship between coating thickness and resistance.

[0052] S5, selecting coatings with different elastic moduli, repeating steps S1 to S4, and then obtaining the relationship between the elastic modulus and the resistance.

[0053] S6, subjecting the coated carrier 30 coated with a resin coating having the same thickness and roughness to the above test to obtain a control group of the test.

[0054] According to the test results, the coating resistance curve under different coating thickness, elastic modulus and surface roughness conditions can be drawn.

[0055] The test device for analyzing the drag reduction and scour resistance performance of a coating provided by the utility model can also be used to conduct a water flow scour resistance test of the coating. The specific method is to use water flows with different water velocities to perform shear impact on the coating, and set the impact time of the water flows with different water velocities according to the test requirements. After the coating is subjected to shear impact for a certain period of time, the coating carrier 30 is taken out to perform surface morphology analysis and related mechanical analysis of the coating to evaluate the water flow scour resistance performance of the coating.

[0056] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not deviate from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A testing device for analyzing the drag reduction and erosion resistance performance of coatings, characterized in that: include: A water storage tank, with a first water outlet and a first water inlet disposed on the side wall; The test platform has a second water outlet and a second water inlet respectively disposed on both sides of the bottom, the second water inlet is connected to the first water outlet through a first pipe, the second water outlet is connected to the first water inlet through a second pipe, a liquid flow channel connecting the second water outlet and the second water inlet is disposed in the inner cavity of the test platform, and a horizontal groove is disposed on the lower wall of the liquid flow channel; A coating carrier, the upper surface of which is coated with a coating material, is installed in the horizontal groove and has a shape and size that matches the horizontal groove, so that the upper surface of the coating carrier is flush with the lower inner wall of the liquid flow channel, and the upper surface of the coating carrier becomes a part of the liquid flow channel; as well as Two water pressure measuring gauges are installed on the test platform and are respectively located at the two ends of the coating carrier, and are used to monitor the pressure difference after water flows through the coating material.

2. A test device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 1, characterized in that: The middle part of the test platform located above the liquid flow channel is a cavity structure, and a sealing device made of transparent material is installed in the cavity structure to form an observation window for the coating carrier.

3. A test device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 2, characterized in that: The sealing device consists of a blocking end and an observation end. The size and shape of the blocking end are adapted to the cavity structure. The bottom of the blocking end is flush with the upper inner wall of the liquid flow channel, so that the bottom of the blocking end becomes a part of the liquid flow channel. The observation end is installed on the top of the blocking end and has a cross-sectional size larger than the cross-sectional size of the blocking end and smaller than the cross-sectional size of the test platform.

4. A test device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 3, characterized in that: The sealing device is an acrylic plate.

5. A testing device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 1, characterized in that: Two mounting holes connected to the liquid flow channel are arranged at the bottom of the test platform at the two ends of the coating carrier, and the test end of the water pressure measuring gauge extends into the liquid flow channel from the mounting holes to seal the mounting holes.

6. A test device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 1, characterized in that: The coating carrier is a glass slide.

7. A testing device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 1, characterized in that: The testing device also includes a data processing device connected to the water pressure measuring meter for displaying coating resistance data.

8. A testing device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 7, characterized in that: A flow regulating valve and a power device are installed on the first pipeline.

9. A testing device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 8, characterized in that: A flow meter connected to the data processing device is installed at one end of the first pipeline close to the second water inlet, and the power device is a water pump and a water pressure gauge installed in the middle of the first pipeline.

10. A testing device for analyzing the drag reduction and erosion resistance performance of coatings according to claim 9, characterized in that: The first pipeline and the second pipeline are both two straight pipes consisting of a horizontal pipe and a vertical pipe connected to each other.

Images