A multifunctional experimental device for surface wetting performance test

Abstract

The application discloses a multifunctional experimental device for surface wetting performance test, which comprises a multi-degree-of-freedom object carrying platform, a support control mechanism and a liquid drop system, the support control mechanism is connected with the multi-degree-of-freedom object carrying platform and the liquid drop system respectively, and the liquid drop system is moved through the support control mechanism; the liquid drop system comprises a liquid drop support, a stepping module, an injection push rod connecting piece, knurled studs, an injection push rod, an injection liquid storage tube, a temperature controller, a straight-through one-way valve, a liquid drop needle fixing support, a liquid drop needle group, a laser range finder and a liquid storage tank; the liquid drop support is connected with the support control mechanism and the stepping module; one end of the injection push rod connecting piece is connected with the stepping module, and the other end is connected with the injection push rod through the knurled studs. The application can meet the functional requirements of different experiments, simplify operation steps, accurately control, improve data accuracy, and can be applied to contact angle and rolling angle measurement experiment, liquid drop bounce experiment, hot drop adhesion experiment, self-cleaning experiment and water jet experiment environment.

Description

Technical Field

[0001] This invention pertains to wetting performance testing devices, specifically a multifunctional experimental device for testing surface wetting performance. Background Technology

[0002] Surface wettability refers to the ability or tendency of a liquid to spread on a solid surface. It is typically measured using contact angle and roll-off angle to determine the strength of wettability (the degree of hydrophilicity or hydrophobicity of the solid surface). Currently, in the field of surface wettability research, researchers are not limited to using contact angle and roll-off angle to measure the wettability of the surface under test. They also use a series of experiments to characterize the surface's wettability, such as droplet bounce height, thermally induced adhesion strength, and self-cleaning ability.

[0003] Currently, to meet the various parameter requirements of the aforementioned experiments, researchers typically need to purchase the necessary modules and assemble them one by one. While this method can temporarily satisfy experimental conditions, the crude experimental setup and complex operating procedures often lead to uncontrollable experimental errors, and may even cause research to stagnate or fail. Chinese Patent Application No. 202111387618.4 discloses a functional surface superhydrophobic performance testing device and its usage method, but it is only designed with unidirectional control of pipette movement, which cannot complete small-range manual adjustments. Its controllability and flexibility are poor, and the influence of electric control precision and mechanical structure gaps makes it impossible to achieve precise position adjustment.

[0004] How to simplify the device structure, achieve functional integration, and fine parameter control while meeting different experimental conditions has become an urgent problem to be solved in the field of surface wetting performance research. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a multifunctional experimental device for testing surface wetting properties that can control the liquid temperature and dripping speed according to experimental requirements, is easy to move and rotate, and has precise position control.

[0006] Technical Solution: The present invention provides a multifunctional experimental device for testing surface wetting properties, comprising a multi-degree-of-freedom loading platform, a support and control mechanism, and a droplet system. The support and control mechanism is connected to both the multi-degree-of-freedom loading platform and the droplet system, and the droplet system moves through the support and control mechanism. The droplet system includes a droplet support, a stepping module, an injection pusher connector, a knurled stud, an injection pusher, an injection reservoir, a temperature controller, a straight-through one-way valve, a droplet needle fixing support, a droplet needle assembly, a laser rangefinder, and a reservoir. The droplet support is connected to both the support and control mechanism and the stepping module. One end of the injection pusher connector is connected to the stepping module... The two ends are connected, with the other end connected to the injection plunger via a knurled stud, for micro-movement of the injection plunger; the injection plunger is nested inside the injection reservoir and can move along its piston, thereby controlling the outflow or inflow of liquid; a temperature controller is installed on the injection reservoir to control the internal liquid temperature, for constant temperature control of the liquid stored inside; a straight-through one-way valve is connected between the reservoir and the injection reservoir, and between the drip needle fixing support and the injection reservoir, for replenishing the liquid in the injection reservoir; a drip needle assembly and a laser rangefinder are installed on the drip needle fixing support, the laser rangefinder being used to measure the accurate distance between the drip needle and the surface of the sample to be tested.

[0007] Furthermore, the multi-degree-of-freedom loading platform sequentially includes a Z-axis movement control component, a Y-axis movement control component, an X-axis movement control component, an X-axis movement platform component, a leveling platform component, and a tilting loading platform component, with each pair slidably or rotatably connected. The Z-axis rotating base cooperates with the Z-axis moving spindle to enable the loading platform to rotate along the Z-axis. The Y-axis moving platform moves along the Y-axis on the Z-axis rotating base via dovetail groove one and dovetail slide one. Similarly, driven by a combination of worm gear and rack and pinion transmission, the X-axis moving platform moves along the X-axis on the Y-axis moving platform via dovetail groove two and dovetail slide two.

[0008] Furthermore, the Z-axis movement control assembly includes a platform base, a shaft end flange, a bearing end cover, a lead screw driven bevel gear, a combined driving bevel gear, a driving spur gear, a gear fixing frame, a Z-knob, and a Z-axis movement spindle. The platform base is fixed on the structural control system. The lead screw driven bevel gear is connected to the platform base through the bearing, the shaft end flange, and the bearing end cover. The combined driving bevel gear is mounted on the gear fixing frame and meshes with the lead screw driven bevel gear and the driving spur gear, respectively. The driving spur gear passes through the gear fixing frame and is connected to the Z-knob. The Z-axis movement spindle is driven by the lead screw driven bevel gear through a ball screw pair.

[0009] Furthermore, a strip-shaped boss is provided on the Z-axis moving spindle to restrict its movement to only the Z direction, and a strip-shaped groove is provided on the base of the loading platform.

[0010] Furthermore, the Y-axis movement control assembly includes a Z-axis rotating base, on which a dovetail groove and a worm gear assembly are provided.

[0011] Furthermore, the X-axis movement control component includes a Y-axis movement platform, on which a second dovetail groove, a first dovetail slide table slidably connected to the first dovetail groove, and a worm gear assembly are provided.

[0012] Furthermore, the worm gear assembly includes a positioning bolt, a worm gear, a worm, a needle roller thrust combined bearing, a bearing housing, and a Y knob. The worm gear is connected to the Z-axis rotating base via the positioning bolt and the needle roller thrust combined bearing. One end of the worm meshes with the worm gear for transmission, and the other end passes through the bearing housing and is connected to the Y knob. The bearing housing is connected to the Z-axis rotating base.

[0013] Furthermore, the X-axis moving platform assembly includes an X-axis moving platform, the surface of which is provided with a rack, a dovetail slide, and a limiting block. The rack meshes with the worm gear assembly, and the dovetail slide is slidably connected to the X-axis moving control assembly.

[0014] Furthermore, the leveling platform assembly includes a compression spring, knurled bolts, and a leveling platform. The knurled bolts are threadedly connected to the limit block on the X-axis moving platform assembly via the compression spring. A universal bubble level is installed on the leveling platform, and strip holes are provided on the leveling platform. The distance between the upper and lower planes is adjusted by twisting the knurled bolts to make the upper plane level.

[0015] Furthermore, the tilting platform assembly includes a powerful magnetic platform hinged to the leveling platform, with an tilt pointer at the hinge. The surface of the powerful magnetic platform is provided with a clamp for clamping the test sample. The powerful magnetic platform is equipped with a shaped slide, a slider, a lead screw, a micrometer knob, a slide rail, and a guide groove. The shaped slide is slidably connected to the slide rail, the lead screw is fixedly connected to the micrometer knob, and the shaped slide is connected to the slider and can slide along the guide groove and the slotted hole to achieve the tilting of the powerful magnetic platform.

[0016] Furthermore, the support control mechanism includes an overall base with feet mounted on its bottom. The Z-axis module support is fixedly mounted to the overall base with screws to support the Z-axis module. The X-axis module support is fixedly mounted to the slide of the Z-axis module with screws to support the X-axis module. The Z-axis module and X-axis module are used to control the Z-axis and X-axis positional movement of the dripping system, respectively.

[0017] Working Principle: The support and control mechanism is mainly used to control the relative position between the droplet system and the multi-degree-of-freedom platform. Combined with computer control technology, it enables visualization and automated intelligent control of the droplet system's position coordinates. This real-time tracking of the droplet system's position improves the accuracy of experimental operations. The multi-degree-of-freedom platform achieves movement and rotation in multiple degrees of freedom through the organic combination of various transmission methods, resulting in higher flexibility and stronger operability. The droplet system mainly performs liquid storage and dripping functions. The storage tank and injection tube connected by a linear one-way valve enable the replenishment of the test liquid and the smooth dripping of the droplets. The dripping needle assembly can meet the dripping needle requirements of most experiments. The laser rangefinder mainly realizes real-time monitoring of the droplet's falling distance, improving the standardization and accuracy of the experiment. Compared with existing experimental devices, this device has a higher degree of automation and intelligence, stronger operability during use, higher accuracy in acquiring experimental data, and greatly improves the standardization of experiments.

[0018] Instructions for use: The droplet bouncing experiment includes the following steps:

[0019] a. Preparation: The cargo platform returns to its original state, and the laser rangefinder is in the measuring position; Power on: Turn on the device and corresponding computer software described in this invention.

[0020] b. Return the dripping system to its initial set position (the set height directly above the platform); based on the real-time display value of the laser rangefinder, enter the corresponding value in the distance input box for controlling the dripping system, and move the dripping system to a position slightly higher than the required drop height for the experiment.

[0021] c. Add an appropriate amount of the liquid to be tested into the storage tank, control the injection plunger to move upward to replenish the liquid into the injection storage tube, and set the temperature controller temperature so that the temperature of the liquid to be tested is close to the temperature of the surface to be tested (external measurement);

[0022] d. Fix the sample to be tested on the surface of the strong magnetic stage; adjust the X and Y knobs to position the sample surface directly below the laser rangefinder; fine-tune the Z knob according to the displayed distance to make the displayed distance equal to the required droplet drop height in the experiment;

[0023] e. Select the 0° drip needle (straight tip) from the drip needle set;

[0024] f. Adjust the position of the high-speed camera and put it into experimental mode;

[0025] g. Wait for the liquid temperature to reach the set value and remain constant; then enter the specified flow rate value in the liquid flow rate input box.

[0026] h. Turn on the high-speed camera recording button to start shooting; keep clicking the button to move the stepping module down.

[0027] i. After dropping an appropriate droplet, cancel the button to control the stepping module to move downwards and stop the high-speed camera from taking pictures; after taking pictures of the scale alone, the experiment is complete.

[0028] The hot droplet adhesion experiment includes the following steps:

[0029] a. Preparation: The cargo platform returns to its original state, and the laser rangefinder is in the measuring position; Power on: Turn on the device and corresponding computer software described in this invention.

[0030] b. Return the dripping system to its initial set position (the set height directly above the platform); based on the real-time display value of the laser rangefinder, enter the corresponding value in the distance input box for controlling the dripping system, and move the dripping system to a slightly higher position above the platform;

[0031] c. Add an appropriate amount of the liquid to be tested into the storage tank, control the injection plunger to move upward to replenish the liquid into the injection storage tube, and set the temperature controller temperature so that the temperature of the liquid to be tested and the temperature of the surface to be tested (external measurement) are at the required temperature difference ΔT.

[0032] d. Adjust the position of the high-speed camera and put it into experimental mode;

[0033] e. Select the corresponding angled drip needle (bend) in the drip needle group;

[0034] f. Fix the sample to be tested on the surface of the strong magnetic stage; adjust the micrometer knob to make the strong magnetic stage reach the required angle for the experiment; adjust the X and Y knobs to make the sample surface be in the corresponding position directly below the laser rangefinder; observe with the high-speed camera and fine-tune the Z knob to make the dropping needle be in the required position for the experiment.

[0035] g. Wait for the liquid temperature to reach the set value and remain constant; then enter the specified flow rate value in the liquid flow rate input box.

[0036] h. Turn on the high-speed camera recording button to start shooting; keep clicking the button to move the stepping module down.

[0037] i. After the appropriate droplet has rolled down, cancel the button to control the stepping module to move downwards, stop the high-speed camera from taking pictures, and complete the experiment.

[0038] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0039] 1. It can be widely used in surface wetting performance testing, can be placed on any plane, and has a large range of automatic adjustment and a small range of manual adjustment. It has good controllability and flexibility, realizes functional integration and fine parameter control, and can be widely used in plane / sloping surface contact angle and roll-off angle measurement experiments, droplet bouncing experiments, hot droplet adhesion experiments, self-cleaning experiments and water jet experiments.

[0040] 2. By combining standard cylindrical spur gear transmission, bevel gear transmission and ball screw transmission, the motion conversion from rotation around the X-axis to rotation around the Z-axis and then movement around the Z-axis is completed, realizing the Z-axis movement of the loading platform;

[0041] 3. By combining worm gear transmission and rack and pinion transmission, the motion conversion from rotation to vertical movement is completed, realizing the XY axis movement of the loading platform;

[0042] 4. By combining ball screw drive and slider groove mechanism, the loading platform can rotate around the axis to achieve an inclined state;

[0043] 5. Equipped with a universal bubble level, it ensures the absolute level of the platform without the need for additional leveling. The connection between the leveling platform and the strong magnetic platform is marked with graduations, allowing direct adjustment of the platform's tilt angle without additional adjustments. This achieves multi-functional integration and simplifies the operation process.

[0044] 6. The linear module, stepper module, temperature controller and laser rangefinder involved in the droplet system in the control system can all be controlled and displayed in real time by computer software, realizing intelligent control for multiple applications, which greatly ensures the convenience and standardization of the experiment.

[0045] 7. Two linear one-way valves enable unidirectional flow of liquid. When the injection plunger is pushed down, the squeezed liquid will only flow out from the dispensing needle and will not flow into the reservoir. Conversely, when the injection plunger moves up, air will not be drawn in from the dispensing needle, but the liquid in the reservoir will be replenished into the injection reservoir tube.

[0046] 8. The laser rangefinder and the drop needle are mounted on the same circumference. When the laser rangefinder rotates to the outlet, the measured height is the actual drop height. This design avoids the problem of inaccurate drop height when the surface to be measured is inclined, ensuring the accuracy of experimental data. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the present invention;

[0048] Figure 2 This is a schematic diagram of the structure of the multi-degree-of-freedom loading platform 1 of the present invention;

[0049] Figure 3 This is a first-level exploded view of the multi-degree-of-freedom cargo platform 1 of the present invention;

[0050] Figure 4 This is a second-order exploded view of the multi-degree-of-freedom cargo platform 1 of the present invention;

[0051] Figure 5This is a schematic diagram of the structure of the worm gear assembly 1203 of the present invention;

[0052] Figure 6 This is a schematic diagram of the structure of the powerful magnetic stage 1601 of the present invention;

[0053] Figure 7 This is a schematic diagram of the tilt scale 1506 of the present invention;

[0054] Figure 8 This is a schematic diagram of the structure of the support control mechanism 2 of the present invention;

[0055] Figure 9 This is an exploded schematic diagram of the dripping system 3 of the present invention;

[0056] Figure 10 These are schematic diagrams of four structures of the drip needle assembly 310 of the present invention;

[0057] Figure 11 This is the computer-aided relationship diagram of the present invention. Detailed Implementation

[0058] The direction parallel to dovetail groove 2 1302 (lateral direction) is defined as the "X-axis direction", the direction parallel to dovetail groove 1 1202 (longitudinal direction) is defined as the "Y-axis direction", and the direction parallel to the Z-axis moving main axis 1109 (vertical direction) is defined as the "Z-axis direction".

[0059] like Figures 1-2 The multifunctional experimental apparatus for testing surface wetting properties includes a multi-degree-of-freedom loading platform 1, a support and control mechanism 2, and a dripping system 3. The multi-degree-of-freedom loading platform 1 is fixedly connected to the support and control mechanism 2 by bolts at the bottom of the apparatus, and the dripping system 3 is fixedly connected to the support and control mechanism 2 by bolts and threads.

[0060] like Figures 3-4 The multi-degree-of-freedom loading platform 1 includes, from bottom to top, a Z-axis motion control component 11, a Y-axis motion control component 12, an X-axis motion control component 13, an X-axis motion platform component 14, a leveling platform component 15, and an inclined loading platform component 16, which are connected to each other by sliding or rotation.

[0061] The Z-axis movement control assembly 11 includes a platform base 1101, a shaft end flange 1102, a bearing end cover 1103, a lead screw driven bevel gear 1104, a combined driving bevel gear 1105, a drive spur gear 1106, a gear fixing frame 1107, a Z-knob 1108, and a Z-axis movement spindle 1109. The platform base 1101 is fixedly mounted on the support control mechanism 2. A bearing is installed between the lead screw driven bevel gear 1104 and the platform base 1101, and the bearing is fixed in a bearing hole on the platform base 1101 by the bearing end cover 1103. The shaft end flange 1102 is used to prevent the lead screw driven bevel gear 1104 from moving axially. The combined driving bevel gear 1105 is mounted on the gear fixing frame 1107 by a round nut. Its front bevel gear meshes with the lead screw driven bevel gear 1104, and its rear standard cylindrical spur gear meshes with the drive spur gear 1106. The drive spur gear 1106 is positioned by the gear holder 1107 and passes through the platform base 1101 to connect with the Z knob 1108. The gear holder 1107 is fixedly installed on the platform base 1101 by bolts. The Z-axis moving spindle 1109 is driven by a ball screw pair and a driven bevel gear 1104. The Z-axis moving spindle 1109 and the platform base 1101 are respectively provided with a strip-shaped boss and a strip-shaped groove to prevent the Z-axis moving spindle 1109 from rotating with the driven bevel gear 1104, thus allowing movement only in the Z direction.

[0062] The Y-axis movement control assembly 12 includes a Z-axis rotating base 1201. The upper surface of the Z-axis rotating base 1201 is provided with a worm gear assembly 1203 and dovetail grooves 1202 that are parallel to each other. The lower surface is provided with a cylindrical boss that contacts and cooperates with the Z-axis moving spindle 1109 to realize rotation around the Z-axis.

[0063] The X-axis movement control assembly 13 includes a Y-axis moving platform 1301. The bottom surface of the Y-axis moving platform 1301 is fixedly provided with a dovetail slide 1303 that is slidably connected to a dovetail groove 1202. The upper surface has parallel dovetail grooves 1302 and a worm gear assembly 1203. The Y-axis moving platform 1301 moves along the Y-direction under the drive of the worm gear and standard spur gear transmission.

[0064] The X-axis moving platform assembly 14 includes an X-axis moving platform 1401. Limiting blocks 1404 are respectively provided at the four corners of the upper surface of the X-axis moving platform 1401. A second dovetail slide 1403 is slidably connected to a first dovetail slide groove 1302 on the lower surface. A rack 1402 is mounted on the inner side of the second dovetail slide 1403. The rack 1402 meshes with a standard spur gear in the worm gear assembly 1203 for transmission. The X-axis moving platform 1401 moves along the X-direction under the drive of the worm gear and the standard spur gear transmission.

[0065] The leveling platform 1503 of the leveling platform assembly 15 has knurled bolts 1502 at its four corners. These four knurled bolts 1502 are threadedly connected to four limiting blocks 1404 on the X-axis moving platform assembly 14 via compression springs 1501. The leveling platform 1503 is equipped with a universal bubble level 1504 and a slotted hole 1505. The leveling platform 1503 is connected to the X-axis moving platform 1401 via the knurled bolts 1502 and compression springs 1501. During leveling, the relative position between the two planes is adjusted by rotating the knurled bolts 1502 at the four corners, ensuring the bubble in the universal bubble level 1504 is centered.

[0066] like Figure 5 The worm gear assembly 1203 includes a positioning bolt 12031, a worm gear 12032, a worm 12033, a needle roller thrust combined bearing 12034, a bearing housing 12035, and a Y knob 12036. The worm gear 12032 is positioned and connected to the Z-axis rotating base 1201 via the needle roller thrust combined bearing 12034 and fixed by the positioning bolt 12031. The worm 12033 is mounted on the Z-axis rotating base 1201 via the bearing housing 12035, meshes with the worm gear 12032 for transmission, and passes through the Z-axis rotating base 1201 to be fixedly connected to the Y knob 12036.

[0067] like Figures 6-7 The tilting platform assembly 16 includes a powerful magnetic platform 1601 coaxially fitted with the left end of the leveling platform 1503. At both ends of the coaxial fit, the leveling platform 1503 is provided with a tilt angle dial 1506, and correspondingly, the powerful magnetic platform 1601 is provided with a tilt angle pointer 1608 for adjusting the tilt angle of the powerful magnetic platform 1601. The powerful magnetic platform 1601 contains a shaped slide block 1603, a slider 1604, a lead screw 1605, a micrometer knob 1606, a slide rail 1607, and a guide groove 1609. The lead screw 1605 and slide rail 1607 are slidably connected to the shaped slide block 1603, and the lead screw 1605 is fixedly connected to the micrometer knob 1606. The shaped slide block 1603 is rotatably connected to the slider 1604 and can slide along the guide groove 1609 and the slotted hole 1505. The specific adjustment method is as follows: The slide rail 1607 is horizontally fixed to the center of the leveling platform 1503 by screws. The irregularly shaped slide block 1603 is installed on the slide rail 1607 and can slide along the X direction. Thin rods extend from both sides of the slide block 1603, pass through the strip holes 1505 on the leveling platform 1503, and are connected to the slider 1604 by bearings. The slider 1604 moves along the X direction with the irregularly shaped slide block 1603 and slides along the obliquely designed guide groove 1609 on the powerful magnetic stage 1601, causing the powerful magnetic stage 1601 to rotate around the mounting axis, thus tilting the platform. The clamp 1602 is magnetically attracted to the surface of the powerful magnetic stage 1601 for clamping and positioning the non-metallic sample to be tested.

[0068] like Figure 8 The support control mechanism 2 includes a main base 22, with feet 21 mounted on the bottom of the main base 22. A Z-axis module support 23 is fixedly mounted to the main base 22 by screws, supporting the Z-axis module 24. An X-axis module support 25 is fixedly mounted to the slide of the Z-axis module 24 by screws, supporting the X-axis module 26. The Z-axis module 24 and X-axis module 26 are used to control the Z-axis and X-axis positional movement of the dripping system 3, respectively.

[0069] like Figures 9-10 The dripping system 3 includes a dripping support 301 fixed to the slide of the X-axis module 26 by screws, used to fix the stepper module 302, the injection reservoir 306, and the reservoir 312. One end of the injection pusher connector 303 is fixed to the slide of the stepper module 302 by screws and moves up and down along the slide; the other end is connected to the injection pusher 305 via a knurled stud 304. When the injection pusher connector 303 moves up and down along the slide of the stepper module 302, it drives the injection pusher 305 to perform piston-like motion within the injection reservoir 306, thereby controlling the flow of liquid in and out. A temperature controller 307 is fixedly installed at the corresponding position in the injection reservoir 306 by screws to control the internal liquid temperature. A straight-through check valve 308 connects the reservoir 312 and the injection reservoir 306 to control the unidirectional flow of liquid. A straight-through one-way valve 308 connects the dispensing needle holder 309 to the injection reservoir tube 306 and is fixedly installed at the bottom of the injection reservoir tube 306 with screws. The dispensing needle holder 309 is designed with a rotatable wheel for mounting the dispensing needle assembly 310 and the laser rangefinder 311. One type of dispensing needle assembly 310 can be selected according to different experimental needs. The droplet outlet direction of the dispensing needle assembly 310 is vertical, or at an angle of 20°, 45°, or 60° to the horizontal. The laser rangefinder 311 is used to measure the distance between the dispensing needle and the surface to be measured.

[0070] like Figure 11 Upon opening the corresponding software on the computer, the computer panel will display: the real-time position coordinates of the dripping system 3, buttons for controlling its up, down, left, and right movement, a distance input box, buttons for controlling the up and down movement of the stepper module 302, a liquid flow rate input box, the real-time temperature of the liquid in the injection reservoir 306, a temperature setting input box for the temperature controller 307, and measurement data from the laser rangefinder 311. By clicking the buttons or entering a distance value, the dripping system 3 can be controlled to a specified position in the XOZ plane; by entering a set temperature value, the liquid temperature in the injection reservoir 306 can be controlled. This invention can be applied to various experiments, including contact angle and roll-off angle measurement experiments on planes / inclined surfaces, droplet bouncing experiments, hot droplet adhesion experiments, self-cleaning experiments, and water jet experiments.

[0071] A droplet bouncing experiment using a multifunctional experimental setup for testing surface wettability includes the following steps:

[0072] S1. Preparation: The multi-degree-of-freedom loading platform 1 returns to its original state, the laser rangefinder 311 is in the measuring position, power on, and open the device and corresponding computer software.

[0073] S2. Return the dripping system 3 to the initial set position (the set height directly above the multi-degree-of-freedom platform 1); according to the real-time display value of the laser rangefinder 311, enter the corresponding value in the distance input box of the dripping system 3, and move the dripping system 3 to a slightly higher position than the required drop height of the experiment.

[0074] S3. Add an appropriate amount of the liquid to be tested into the storage tank 312, control the injection push rod 305 to move upward to replenish the liquid into the injection storage tube 306, and set the temperature of the temperature controller 307 so that the temperature of the liquid to be tested is close to the temperature of the surface to be tested (external measurement).

[0075] S4. Fix the sample to be tested on the surface of the strong magnetic stage 1601, and adjust the X and Y knobs 12036 to make the sample surface be positioned directly below the laser rangefinder 311; fine-tune the Z knob 1108 according to the displayed distance to make the displayed distance equal to the required droplet falling height in the experiment.

[0076] S5. Select the 0° drip needle (straight tip) from the drip needle group 310, such as... Figure 10 a;

[0077] S6. Adjust the position of the high-speed camera and put it into experimental mode;

[0078] S7. Wait for the liquid temperature to reach the set value and remain constant; enter the specified flow rate value in the liquid flow rate input box;

[0079] S8. Turn on the high-speed camera recording button to start shooting; keep clicking the button to move the stepper module 302 down.

[0080] S9. After dropping an appropriate droplet, cancel the button to move the stepping module 302 downwards and stop the high-speed camera from taking pictures; after taking pictures of the scale alone, the experiment is complete.

[0081] A hot droplet adhesion experiment using a multifunctional experimental setup for surface wetting performance testing includes the following steps:

[0082] S1. Preparation: The multi-degree-of-freedom loading platform 1 returns to its original state, the laser rangefinder 311 is in the measuring position, power on, and open the device and corresponding computer software.

[0083] S2. Return the dripping system 3 to its initial set position (the set height directly above the multi-degree-of-freedom platform 1); based on the real-time display value of the laser rangefinder 311, input the corresponding value in the distance input box of the dripping system 3, and move the dripping system 3 to a slightly higher position above the multi-degree-of-freedom platform 1.

[0084] S3. Add an appropriate amount of the liquid to be tested into the storage tank 312, control the injection push rod 305 to move upward to replenish the liquid into the injection storage tube 306, and set the temperature of the temperature controller 307 so that the temperature of the liquid to be tested and the temperature of the surface to be tested (external measurement) are at the required temperature difference ΔT.

[0085] S4. Adjust the position of the high-speed camera and put it into experimental mode;

[0086] S5. Select the corresponding angled drip needle (bend) in the drip needle group 310, such as... Figure 10 Middle B~ Figure 10 d;

[0087] S6. Fix the sample to be tested on the surface of the strong magnetic stage 1601; adjust the micrometer knob 1606 to make the strong magnetic stage 1601 reach the required angle for the experiment; adjust the X and Y knobs 12036 to make the sample surface be directly below the laser rangefinder 311; observe with the high-speed camera and fine-tune the Z knob 1108 to make the dropping needle be in the required position for the experiment.

[0088] S7. Wait for the liquid temperature to reach the set value and remain constant; enter the specified flow rate value in the liquid flow rate input box;

[0089] S8. Turn on the high-speed camera recording button to start shooting; keep clicking the button to move the stepper module 302 down.

[0090] S9. After the appropriate droplet rolls down, cancel the button to control the stepping module 302 to move downwards, stop the high-speed camera from taking pictures, and complete the experiment.

Claims

1. A multifunctional experimental apparatus for testing surface wettability, characterized in that: It includes a multi-degree-of-freedom carrying platform, a support and control mechanism, and a droplet system, wherein the support and control mechanism is connected to the multi-degree-of-freedom carrying platform and the droplet system respectively; The multi-degree-of-freedom loading platform includes, from bottom to top, a Z-axis movement control component, a Y-axis movement control component, an X-axis movement control component, an X-axis movement platform component, a leveling platform component, and a tilting loading platform component, which are connected to each other by sliding or rotation. The leveling platform assembly includes a compression spring, a knurled bolt, and a leveling platform. The knurled bolt is threadedly connected to the limit block on the upper surface of the X-axis moving platform assembly via the compression spring. A universal bubble level is installed on the leveling platform, and a strip hole is provided on the leveling platform. The tilting platform assembly includes a powerful magnetic platform hinged to a leveling platform, with a tilt pointer at the hinge. The surface of the powerful magnetic platform is equipped with clamps for holding the test sample. The powerful magnetic platform contains a shaped slide, a slider, a lead screw, a micrometer knob, a slide rail, and a guide groove. The lead screw and slide rail are slidably connected to the shaped slide, and the lead screw is connected to the micrometer knob. The slide rail is horizontally fixed at the center of the leveling platform. Thin rods extending from both sides of the shaped slide pass through slotted holes on the leveling platform and are connected to the slider via bearings. The shaped slide is mounted on the slide rail. The slider moves along the X-direction with the shaped slide while sliding along the obliquely designed guide groove and the slotted holes on the powerful magnetic platform, causing the powerful magnetic platform to rotate around the hinge, thus tilting the powerful magnetic platform. The Z-axis movement control assembly includes a Z-axis movement spindle; The Y-axis movement control component includes a Z-axis rotating base. The upper surface of the Z-axis rotating base is provided with a dovetail groove and a worm gear assembly, and the lower surface is provided with a cylindrical boss that contacts and engages with the Z-axis movement spindle. The X-axis movement control component includes a Y-axis movement platform. The lower surface of the Y-axis movement platform is provided with a dovetail slide table 1 that is slidably connected to a dovetail groove 1 along the Y direction. The upper surface is provided with a dovetail groove 2 and a worm gear assembly 2. The X-axis moving platform assembly includes an X-axis moving platform. The lower surface of the X-axis moving platform is provided with a rack, a dovetail slide that is slidably connected to a dovetail groove along the X direction, and a limiting block. The rack meshes with a worm gear assembly, and the dovetail slide is slidably connected to an X-axis moving control assembly along the X direction.

2. A multifunctional experimental apparatus for testing surface wettability according to claim 1, characterized in that: The Z-axis movement control assembly also includes a platform base, a shaft end flange, a bearing end cover, a lead screw driven bevel gear, a combined driving bevel gear, a driving spur gear, a gear fixing frame, and a Z-knob. The platform base is fixed on the support control mechanism. The lead screw driven bevel gear is connected to the platform base through the bearing, the shaft end flange, and the bearing end cover. The combined driving bevel gear is mounted on the gear fixing frame and meshes with the lead screw driven bevel gear and the driving spur gear, respectively. The driving spur gear passes through the gear fixing frame and is connected to the Z-knob. The Z-axis movement spindle is driven by the lead screw driven bevel gear through a ball screw pair.

3. The multifunctional experimental apparatus for testing surface wettability according to claim 2, characterized in that: The Z-axis moving spindle is provided with a strip-shaped boss that restricts its movement to only the Z direction, and the base of the loading platform is provided with a strip-shaped groove.

4. The multifunctional experimental apparatus for testing surface wettability according to claim 1, characterized in that: The worm gear assembly includes a positioning bolt, a worm gear, a worm, a needle roller thrust combined bearing, a bearing housing, and a Y knob. The worm gear is connected to the Z-axis rotating base via the positioning bolt and the needle roller thrust combined bearing. One end of the worm meshes with the worm gear for transmission, and the other end passes through the bearing housing and is connected to the Y knob. The bearing housing is connected to the Z-axis rotating base.

5. A multifunctional experimental apparatus for testing surface wettability according to claim 1, characterized in that: The droplet system is moved by a support control mechanism. The droplet system includes a droplet support, a stepping module, an injection pusher connector, a knurled stud, an injection pusher, an injection reservoir, a temperature controller, a straight-through check valve, a droplet needle fixing support, a droplet needle assembly, a laser rangefinder, and a reservoir. The droplet support is connected to both the support control mechanism and the stepping module. One end of the injection pusher connector is connected to the stepping module, and the other end is connected to the injection pusher via a knurled stud. The injection pusher is nested within the injection reservoir and can move along it like a piston, thereby controlling the flow of liquid in or out. A temperature controller is installed on the injection reservoir to control the internal liquid temperature. Straight-through check valves are connected between the reservoir and the injection reservoir, and between the droplet needle fixing support and the injection reservoir. A droplet needle assembly and a laser rangefinder are installed on the droplet needle fixing support.

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