A dual-vision contact angle test instrument

Abstract

The invention discloses a dual-vision contact angle test instrument, which relates to the technical field of measuring instruments, and comprises a protective cover, a frame, a light source, a bearing unit, an imaging unit and an injection unit. The protective cover is used to protect a test liquid from being contaminated and deformed, which affects the test result. The frame is used to install and fix the light source, the bearing unit, the imaging unit and the injection unit. The bearing unit is used to contain the liquid to be tested and change the detection position. The imaging unit is used to image the liquid to be tested and feed back to a controller for analysis. The injection unit is used for dripping and self-cleaning of the liquid to be tested. After the injection unit drops the droplet to be tested on the bearing unit, when the light source irradiates the droplet to be tested on the bearing unit, the imaging unit images the droplet to be tested and feeds back to analysis software for contact angle analysis. When the droplet to be tested needs to be replaced, the injection unit performs internal self-cleaning to avoid the tediousness and experimental progress caused by replacing the entire injection unit.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, in particular to a dual-vision contact angle testing instrument. Background Art

[0002] In industrial production, medical treatment, scientific research and other fields, dropper is a key component for liquid transmission. Its cleanliness and maintenance efficiency directly affect the stability and operation cost of the system. During the use of traditional dropper, the inside of the dropper is often contaminated due to problems such as liquid residue and microbial growth. Therefore, when replacing the liquid to be tested, the entire dropper is generally replaced, which increases the difficulty and cost of maintenance. The existing method of cleaning the inside of the dropper generally requires removing the dropper and simply cleaning it with a brush, which is also unable to fully clean the residue attached to the inner wall of the dropper.

[0003] In addition, there is no equipment in the domestic market that uses a dual-vision contact angle tester. For the study of special samples, separate or simultaneous top and horizontal tests are performed. It is also unable to observe and analyze products with flat surfaces, and it is also unable to observe, analyze and measure products with concave or irregular surfaces. Therefore, further improvements are needed in related issues such as making the measurement repeatability more stable, meeting more test functions, and improving measurement accuracy and production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a dual-vision contact angle testing instrument to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The dual-vision contact angle tester comprises a protective cover, a frame, a light source, a bearing unit, an imaging unit and an injection unit. The frame is placed on a horizontal foundation. The frame is provided with two groups of large and small curved frames. The protective cover is sleeved outside the frame. The light source is fixedly mounted on the inner surface of one end face of the protective cover perpendicular to the horizontal axis. The bearing unit is fixedly mounted on the end of the frame away from the horizontal foundation. There are two groups of imaging units. The two groups of imaging units are fixedly connected to the large and small curved frames of the frame respectively. The injection unit is fixedly connected to the frame. The injection unit has the function of dripping the liquid to be tested and self-cleaning.

[0007] The protective cover is used to protect the test liquid from contamination and deformation that may affect the test results. The frame is used to install and fix the light source, the carrying unit, the imaging unit and the injection unit. The carrying unit is used to hold the liquid to be tested and change the test position. The imaging unit is used to image the liquid to be tested and feed it back to the controller for analysis. The injection unit is used for dripping and self-cleaning of the liquid to be tested. After the injection unit drops the droplet to be tested on the carrying unit and the light source illuminates the droplet to be tested on the carrying unit, the imaging unit images the droplet to be tested and feeds it back to the analysis software for contact angle analysis. When the droplet to be tested needs to be replaced, the injection unit performs internal self-cleaning to avoid the tediousness and experimental progress caused by replacing the entire injection unit.

[0008] Furthermore, the carrying unit includes a telescopic motor 1, a slide rail 1, a telescopic motor 2, a slide rail 2 and a lifting platform, the slide rail 1 is fixedly installed on one end of the frame away from the horizontal base, the fixed end of the telescopic motor 1 is fixedly installed on one end of the slide rail 1, the telescopic end of the telescopic motor 1 is fixedly connected to the slide rail 2, the fixed end of the telescopic motor 2 is fixedly installed on one end of the slide rail 2, the telescopic end of the telescopic motor 2 is fixedly connected to the lifting platform, the slide rail 1 is slidably connected to the slide rail 2, the slide rail 1 and the slide rail 2 are installed perpendicular to each other, the lifting platform is slidably connected to the slide rail 2, and the lifting platform is electrically connected to the controller.

[0009] When it is necessary to test the contact angle of the liquid to be tested at different positions on the lifting stage, the telescopic motor 1 is started to drive the slide rail 2 to calibrate the front-to-back position on the slide rail 1. After the calibration is completed, the telescopic motor 2 is started to drive the lifting stage to calibrate the left-to-right position on the slide rail 2. After the front-to-back, left-to-right and left-to-right position calibration is completed, the height of the lifting stage is controlled by the controller, and then the liquid is dripped onto the lifting stage to start collecting data on the contact angle of the liquid to be tested at different positions on the lifting stage.

[0010] Furthermore, the imaging unit includes cylinder 1, cylinder 2, camera 1, cylinder 3 and camera 2, the fixed end of cylinder 1 is fixedly installed on the large curved frame of the frame, the telescopic end of cylinder 1 is fixedly connected to the fixed end of cylinder 2, the camera 1 is fixedly installed on the telescopic end of cylinder 2 parallel to the vertical axis, the fixed end of cylinder 3 is fixedly installed on the small curved frame of the frame, and the camera 2 is fixedly connected to the telescopic end of cylinder 3 parallel to the horizontal axis.

[0011] When the injection unit drops the liquid to be tested on the lifting stage, the controller starts the extension of cylinder one to drive cylinder two and camera one to rise and fall in the vertical direction until it is adjusted to the appropriate position. Then, cylinder two is started to extend and retract to drive camera one to adjust its position in the front-to-back direction. After adjusting to the position directly above the droplet to be tested, observe whether the image of the droplet in the analysis software is clear. If not, adjust the magnification and focal length of camera one to make the image of the droplet clear. Start cylinder three to change the distance between camera two and the droplet to be tested until the image of the droplet in camera two is clear. Under the illumination of the light source, the droplet to be tested is clearly imaged. Top and horizontal views are tested simultaneously to improve the accuracy of measuring products with concave or irregular surfaces.

[0012] Furthermore, the injection unit includes a connecting plate, four cylinders, a rotating plate, three telescopic motors, a liquid inlet pipe, a push block, an injection tube, a coil, an electromagnet, a spring, a magnetic block, a movable plate, a double-layer metal sheet, a resistance block, a cleaning ball, a circular frame and a conduit. The connecting plate is fixedly mounted on the end of the large curved frame of the frame, the four fixed ends of the cylinders are fixedly mounted on the end of the connecting plate away from the large curved frame of the frame, the four telescopic ends of the cylinders are rotatably connected to the rotating plate, the three fixed ends of the telescopic motors are fixedly mounted on the rotating plate, the liquid inlet pipe is fixedly mounted on the three telescopic ends of the telescopic motors, one end of the push block is connected to the liquid inlet pipe through a hose, and the other end is conductively and fixedly connected to one end of the conduit, the conduit is slidably mounted inside the injection tube, the other end of the conduit is fixedly connected to the movable plate through a straight rod, and the injection tube is made of It consists of an inner cylinder and an outer cylinder, the coil is evenly wound on the outer surface of the inner cylinder of the injection tube, the electromagnet is fixedly installed on the outer surface of the end of the moving plate away from the horizontal foundation, one end of the spring is fixedly connected to the electromagnet, and the other end is fixedly connected to the magnetic block, the magnetic block is slidably connected to the catheter, the moving plate is slidably installed inside the injection tube, one end of the double-layer metal sheet is fixedly connected to the surface of the end of the moving plate close to the horizontal foundation, the resistance block is connected to the moving plate through the iron block, and the iron block is installed directly below the magnetic block, the cleaning ball is rotatably installed on the end of the circular frame close to the horizontal foundation, the end of the circular frame away from the horizontal foundation is fixedly connected to the end of the moving plate close to the horizontal foundation, the electromagnet is electrically connected to the coil, the double-layer metal sheet is electrically connected to the coil, and the resistance block is electrically connected to the coil.

[0013] By starting the four-axis extension and contraction of the cylinder to adjust the injection tube to the top of the designated drop point on the lifting platform, the staff changes the drop angle of the injection tube by rotating the rotating plate. After the adjustment is completed, the drop operation is performed. When it is necessary to replace the liquid to be tested to clean the injection tube, clean water is introduced through the liquid inlet pipe and passed through the push block and guided into the inside of the catheter. By pushing the push block to drive the catheter and the moving plate to move downward, on the one hand, the magnetic block moves downward synchronously. During the movement of the magnetic block, the magnetic flux passing through the coil changes, thereby generating a forward current in the coil. When the controller detects the forward current, it guides the forward current into the electromagnet, so that the electromagnet generates the same polarity as the magnetic block, thereby pushing the two magnetic blocks close to each other and entering the catheter to block the catheter. Under the action of pressure, the clean water inside the injection tube is pushed out from the bottom for a clean water cleaning. Under the action of the iron block, the two resistor blocks move towards each other as the magnetic blocks approach each other. While the moving plate drives the circular frame to move downward, the cleaning ball rolls along the inner wall of the injection tube to clean and absorb the growths attached to the inner wall of the injection tube, thereby cleaning the inner wall of the injection tube. When a downward stroke is completed, the push block is pulled to drive the catheter and the moving plate to move upward. At this time, the magnetic block generates a reverse current in the coil. When the controller detects the reverse current in the coil, it blocks the reverse current from flowing to the electromagnet. At this time, the electromagnet is no longer magnetic. Under the action of the spring, the magnetic block resets in the opposite direction of the electromagnet, and the magnetic block drives the resistor block to reset, so that the resistor blocks move away from each other. The controller guides a part of the reverse current into the double-layer metal sheet, thereby squeezing the moisture absorbed by the cleaning ball and falling on the resistor block, and the other part of the reverse current is passed into the resistor block, thereby causing the resistor block to heat up and accelerate the evaporation of the liquid to be tested on the resistor block, so that the inside of the injection tube dries quickly, thereby cleaning the injection tube while accelerating the evaporation inside the injection tube.

[0014] Furthermore, the light source is coaxially placed with the second camera.

[0015] In order to make the light emitted by the light source shine on the object to be measured along the optical axis direction of camera 2, the shadow and reflection caused by improper light angle can be reduced, so as to obtain a clearer and more realistic image.

[0016] Furthermore, a positioning strip is provided on the lifting platform.

[0017] The positioning card strip can assist the staff to quickly reach the predetermined precise position when adjusting the position of the droplet to be tested on the lifting stage, avoiding the impact of inaccurate positioning caused by human error or improper operation on the test efficiency.

[0018] Furthermore, the expansion coefficient of the metal sheet at one end of the double-layer metal sheet close to the cleaning ball is smaller than that of the metal sheet at one end far from the cleaning ball.

[0019] In order to make the cleaning ball clean the inner wall of the injection tube, the bimetallic strip is energized to heat up and expand, and the metal sheet with a high expansion coefficient will bend towards the metal sheet with a low expansion coefficient, thereby forming a cross-section. During the rolling process of the cleaning ball, the adsorbed droplets are squeezed and scraped off, thereby improving the secondary adsorption capacity of the cleaning ball and improving the cleaning effect of the inner wall of the injection tube.

[0020] Furthermore, the initial positions of the two magnetic blocks are flush with the inner wall of the catheter.

[0021] In order to make the magnetic blocks approach each other to block the conduit during the downward movement of the movable plate, thereby forming a closed chamber, the clean water under the injection tube is discharged from the inside of the injection tube under the action of pressure. At the same time, when the movable plate moves upward, the two magnetic blocks move away from each other to connect the conduit to prevent the clean water from overflowing from both sides when the clean water is introduced into the conduit again, and cannot reach the lower part of the injection tube, thereby affecting the cleaning effect.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses an imaging unit to simultaneously take photos and images from both the top and horizontal directions, thereby improving the accuracy of measuring products with concave or irregular surfaces.

[0024] 2. The present invention can assist in adjusting the position of the droplet to be tested on the lifting stage through the positioning card strip in the carrying unit to quickly reach a predetermined precise position, thereby avoiding the impact of inaccurate positioning caused by human error or improper operation on the test efficiency.

[0025] 3. In the process of the push block of the injection unit driving the catheter and the movable plate to move downward, the movement of the magnetic block causes the magnetic flux of the coil to change, thereby generating a forward current in the coil. When the controller detects the forward current, it guides the forward current into the electromagnet, so that the electromagnet generates the same polarity as the magnetic block, thereby pushing the two magnetic blocks to approach each other and enter the catheter to block the catheter. Under the action of pressure, the clean water inside the injection tube is pushed out from the bottom to perform a clean water cleaning. At the same time, the cleaning ball rolls along the inner wall of the injection tube to clean the inner wall of the injection tube. When the push block drives the catheter and the movable plate to move upward, the magnetic block generates a reverse current in the coil. The controller guides a part of the reverse current to pass into the double-layer metal sheet, thereby squeezing the water adsorbed by the cleaning ball and falling on the resistance block, and the other part of the reverse current is passed into the resistor, thereby causing the resistor to heat up and accelerate the evaporation of the liquid to be tested on the resistance block, so that the inside of the injection tube is quickly dried, thereby achieving cleaning of the injection tube while accelerating the evaporation inside the injection tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall appearance structure of a dual-vision contact angle tester of the present invention;

[0027] Figure 2 It is a schematic diagram of the appearance structure of part of the bearing unit and part of the imaging unit of a dual-vision contact angle tester of the present invention;

[0028] Figure 3 It is a schematic diagram of the installation position structure of part of the bearing unit and part of the imaging unit of a dual-vision contact angle tester of the present invention;

[0029] Figure 4 It is a schematic diagram of the internal structure of the injection tube of a dual-vision contact angle tester of the present invention when the catheter is in a downward moving state;

[0030] Figure 5 A dual-vision contact angle tester according to the present invention Figure 4 A schematic diagram of the local enlarged structure at point A in the middle;

[0031] Figure 6 It is a schematic diagram of the internal structure of the injection tube of a dual-vision contact angle tester of the present invention when the catheter is in an upward moving state;

[0032] Figure 7 A dual-vision contact angle tester according to the present invention Figure 6 A schematic diagram of the partially enlarged structure at B in the middle;

[0033] Figure 8 A dual-vision contact angle tester according to the present invention Figure 6 A schematic diagram of the partially enlarged structure at C in the middle;

[0034] Fig. 9 A dual-vision contact angle tester according to the present invention Figure 2 Schematic diagram of the local enlarged structure at point D in the middle.

[0035] In the figure: 1, protective cover; 2, frame; 3, light source; 4, bearing unit; 41, telescopic motor 1; 42, slide rail 1; 43, telescopic motor 2; 44, slide rail 2; 45, lifting platform; 5, imaging unit; 51, cylinder 1; 52, cylinder 2; 53, camera 1; 54, cylinder 3; 55, camera 2; 6, injection unit; 61, connecting plate; 62, cylinder 4; 63, rotating plate; 64, telescopic motor 3; 65, liquid inlet pipe; 66, push block; 67, injection tube; 68, coil; 69, electromagnet; 610, spring; 611, magnetic block; 612, moving plate; 613, double-layer metal sheet; 614, resistor block; 615, cleaning ball; 616, circular frame; 617, catheter. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example: Figure 1-Figure 9 As shown, the present invention provides a technical solution:

[0038] like Figure 1 As shown, a dual-vision contact angle tester includes a protective cover 1, a frame 2, a light source 3, a bearing unit 4, an imaging unit 5 and an injection unit 6. The frame 2 is placed on a horizontal basis. The frame 2 is provided with two groups of large and small curved frames. The protective cover 1 is sleeved outside the frame 2. The light source 3 is fixedly mounted on the inner surface of one end face of the protective cover 1 perpendicular to the horizontal axis. The bearing unit 4 is fixedly mounted on the end of the frame 2 away from the horizontal basis. There are two groups of imaging units 5. The two groups of imaging units 5 are fixedly connected to the large and small curved frames of the frame 2 respectively. The injection unit 6 is fixedly connected to the frame 2. The injection unit 6 has the function of dripping the liquid to be tested and self-cleaning.

[0039] The protective cover 1 is used to protect the test liquid from contamination and deformation that affect the test results. The frame 2 is used to install a fixed light source 3, a carrying unit 4, an imaging unit 5 and an injection unit 6. The carrying unit 4 is used to hold the liquid to be tested and change the detection position. The imaging unit 5 is used to image the liquid to be tested and feed it back to the controller for analysis. The injection unit 6 is used for dripping and self-cleaning of the liquid to be tested. After the injection unit 6 drops the droplet to be tested on the carrying unit 4, the light source 3 illuminates the droplet to be tested on the carrying unit 4, and the imaging unit 5 images the droplet to be tested and feeds it back to the analysis software for contact angle analysis. When the droplet to be tested needs to be replaced, the injection unit 6 performs internal self-cleaning to avoid the tediousness and experimental progress caused by replacing the entire injection unit 6.

[0040] like Figure 2 , 3 As shown, the carrying unit 4 includes a telescopic motor 41, a slide rail 42, a telescopic motor 43, a slide rail 44 and a lifting platform 45. The slide rail 42 is fixedly installed at one end of the frame 2 away from the horizontal foundation. The fixed end of the telescopic motor 41 is fixedly installed at one end of the slide rail 42. The telescopic end of the telescopic motor 41 is fixedly connected to the slide rail 44. The fixed end of the telescopic motor 43 is fixedly installed at one end of the slide rail 44. The telescopic end of the telescopic motor 43 is fixedly connected to the lifting platform 45. The slide rail 42 is slidably connected to the slide rail 44. The slide rail 42 and the slide rail 44 are installed perpendicular to each other. The lifting platform 45 is slidably connected to the slide rail 44. The lifting platform 45 is electrically connected to the controller.

[0041] When it is necessary to test the contact angle of the liquid to be tested at different positions on the lifting platform 45, the telescopic motor 1 41 is started to drive the slide rail 2 44 to calibrate the front-to-back position on the slide rail 1 42. After the calibration is completed, the telescopic motor 2 43 is started to drive the lifting platform 45 to calibrate the left-to-right position on the slide rail 2 44. After the front-to-back, left-to-right and left-to-right position calibration is completed, the height of the lifting platform 45 is controlled by the controller, and then the liquid is dripped onto the lifting platform 45 to start data collection of the contact angle of the liquid to be tested at different positions on the lifting platform 45.

[0042] like Figure 2 , 3 As shown, the imaging unit 5 includes a cylinder 1 51, a cylinder 2 52, a camera 1 53, a cylinder 3 54 and a camera 2 55. The fixed end of the cylinder 1 51 is fixedly mounted on the large curved frame of the frame 2, the telescopic end of the cylinder 1 51 is fixedly connected to the fixed end of the cylinder 2 52, the camera 1 53 is fixedly mounted on the telescopic end of the cylinder 2 52 parallel to the vertical axis, the fixed end of the cylinder 3 54 is fixedly mounted on the small curved frame of the frame 2, and the camera 2 55 is fixedly connected to the telescopic end of the cylinder 3 54 parallel to the horizontal axis.

[0043] When the injection unit 6 drops the liquid to be tested onto the lifting stage 45, the controller starts the cylinder 1 51 to extend and retract to drive the cylinder 2 52 and the camera 1 53 to rise and fall in the vertical direction until they are adjusted to the appropriate position. Then, the cylinder 2 52 is started to extend and retract to drive the camera 1 53 to adjust the position in the front and rear directions. After adjusting to the position directly above the droplet to be tested, the image of the droplet in the observation and analysis software is clear. If not, the magnification and focal length of the camera 1 53 are adjusted to make the image of the droplet clear. The cylinder 3 54 is started to change the distance between the camera 2 55 and the droplet to be tested until the image of the droplet in the camera 2 55 is clear. The droplet to be tested is clearly imaged under the illumination of the light source 3. The top view and the horizontal view are tested simultaneously to improve the accuracy of measuring products with concave or irregular surfaces.

[0044] like Figure 4 , 5, 6, 7, 8, and 9, the injection unit 6 includes a connecting plate 61, a cylinder 4 62, a rotating plate 63, a telescopic motor 3 64, a liquid inlet pipe 65, a push block 66, an injection pipe 67, a coil 68, an electromagnet 69, a spring 610, a magnetic block 611, a moving plate 612, a double-layer metal sheet 613, a resistor block 614, a cleaning ball 615, a circular frame 616, and a guide tube 617. The connecting plate 61 is fixedly mounted on the end of the large curved frame of the frame 2, and the cylinder 4 62 is fixed at the fixed end. The connecting plate 61 is fixedly installed at one end of the large curved frame away from the frame 2, the telescopic end of the cylinder 4 62 is rotatably connected with the rotating plate 63, the fixed end of the telescopic motor 3 64 is fixedly installed on the rotating plate 63, the liquid inlet pipe 65 is fixedly installed at the telescopic end of the telescopic motor 3 64, one end of the push block 66 is connected to the liquid inlet pipe 65 through a hose, and the other end is connected to one end of the conduit 617 through conduction and fixed connection, the conduit 617 is slidably installed in the injection tube 67, and the other end of the conduit 617 is connected to the moving plate 61 through a straight rod. 2 is fixedly connected, the injection tube 67 is composed of an inner tube and an outer tube, the coil 68 is evenly wound on the outer surface of the inner tube of the injection tube 67, the electromagnet 69 is fixedly installed on the outer surface of the end of the moving plate 612 away from the horizontal foundation, one end of the spring 610 is fixedly connected to the electromagnet 69, and the other end is fixedly connected to the magnetic block 611, the magnetic block 611 is slidably connected to the guide tube 617, the moving plate 612 is slidably installed inside the injection tube 67, one end of the double-layer metal sheet 613 is fixedly connected to the surface of the end of the moving plate 612 close to the horizontal foundation, the resistor block 614 is connected to the moving plate 612 through the iron block, and the iron block is installed directly below the magnetic block 611, the cleaning ball 615 is rotatably installed on the end of the circular frame 616 close to the horizontal foundation, the end of the circular frame 616 away from the horizontal foundation is fixedly connected to the end of the moving plate 612 close to the horizontal foundation, the electromagnet 69 is electrically connected to the coil 68, the double-layer metal sheet 613 is electrically connected to the coil 68, and the resistor block 614 is electrically connected to the coil 68.

[0045] When the injection tube 67 is adjusted to the above the dripping point specified by the lifting platform 45 by starting the cylinder 42, the staff changes the dripping angle of the injection tube 67 by rotating the rotating plate 63. After the adjustment, the dripping operation is performed. When it is necessary to replace the test liquid to clean the injection tube 67, clean water is introduced through the liquid inlet pipe 65 and the clean water passes through the push block 66 and is guided to the inside of the conduit 617. When the conduit 617 and the moving plate 612 are moved downward by pushing the push block 66, the magnetic block 611 moves downward synchronously. During the process, the magnetic flux passing through the coil 68 changes, thereby generating a positive current in the coil 68. When the controller detects the positive current, it guides the positive current into the electromagnet 69, so that the electromagnet 69 generates the same polarity as the magnetic block 611, thereby pushing the two magnetic blocks 611 to approach each other and enter the conduit 617 to block the conduit 617. Under the action of pressure, the clean water inside the injection tube 67 is pushed out from the bottom to perform a clean water cleaning. The two resistor blocks 614, under the action of the iron block, move the plate 612 on the other hand as the magnetic blocks 611 approach each other. While driving the circular frame 616 to move downward, the cleaning ball 615 rolls along the inner wall of the injection tube 67 to clean and absorb the growth attached to the inner wall of the injection tube 67, thereby cleaning the inner wall of the injection tube 67. When a downward stroke is completed, the guide tube 617 and the moving plate 612 are driven upward by pulling the push block 66. At this time, the magnetic block 611 generates a reverse current in the coil 68. When the controller detects the reverse current in the coil 68, it blocks the reverse current from flowing to the electromagnet 69. At this time, the electromagnet 69 is no longer magnetic, and under the action of the spring 610 The magnetic block 611 resets by moving in the opposite direction of the electromagnet 69, and the magnetic block 611 drives the resistor block 614 to reset, so that the resistor blocks 614 move away from each other. The controller guides a part of the reverse current to pass into the double-layer metal sheet 613, thereby squeezing the moisture adsorbed by the cleaning ball 615 and causing it to fall on the resistor block 614. Another part of the reverse current passes into the resistor block 614, thereby causing the resistor block 614 to heat up and accelerate the evaporation of the liquid to be tested on the resistor block 614, so that the inside of the injection tube 67 dries quickly, thereby cleaning the injection tube 67 while accelerating the evaporation inside the injection tube 67.

[0046] like Figure 2 As shown, the light source 3 is placed coaxially with the camera 2 55 .

[0047] In order to make the light emitted by the light source 3 illuminate the object to be measured along the optical axis direction of the camera 2 55, the shadow and reflection caused by improper light angle are reduced, so as to obtain a clearer and more realistic image.

[0048] like Figure 1 As shown, a positioning strip is provided on the lifting platform 45 .

[0049] The positioning card strip can assist the staff to quickly reach the predetermined precise position when adjusting the position of the droplet to be tested on the lifting stage 45, thereby avoiding the impact of inaccurate positioning problems caused by human errors or improper operation on the test efficiency.

[0050] like Figure 8 As shown, the expansion coefficient of the metal sheet at one end of the double-layer metal sheet 613 close to the cleaning ball 615 is smaller than that of the metal sheet at one end away from the cleaning ball 615 .

[0051] In order for the cleaning ball 615 to clean the inner wall of the injection tube 67, the bimetallic strip 613 is energized to heat up and expand, and the metal strip with a high expansion coefficient will bend towards the metal strip with a low expansion coefficient, thereby forming a cross-section. During the rolling process of the cleaning ball 615, the adsorbed droplets are squeezed and scraped off, thereby improving the secondary adsorption capacity of the cleaning ball 615 and the cleaning effect of the inner wall of the injection tube.

[0052] like Figure 6 As shown, the initial positions of the two magnetic blocks 611 are flush with the inner wall of the catheter 617.

[0053] In order to make the magnetic blocks 611 approach each other to block the conduit 617 during the downward movement of the movable plate 612, thereby forming a closed chamber, the clean water below the injection tube 67 is discharged from the injection tube 67 under the action of pressure. At the same time, when the movable plate 612 moves upward, the two magnetic blocks 611 move away from each other to the conductive conduit 617 to prevent the clean water from overflowing from both sides when the clean water is introduced into the conduit 617 again, and cannot reach the lower part of the injection tube 67, thereby affecting the cleaning effect.

[0054] Working principle of the present invention:

[0055] When it is necessary to test the contact angle of the liquid to be tested at different positions on the lifting platform 45, the telescopic motor 1 41 is started to drive the slide rail 2 44 to calibrate the front-to-back position on the slide rail 1 42. After the calibration is completed, the telescopic motor 2 43 is started to drive the lifting platform 45 to calibrate the left-to-right position on the slide rail 2 44. After the front-to-back, left-to-right and left-to-right position calibration is completed, the height of the lifting platform 45 is controlled by the controller, and then the liquid is dripped onto the lifting platform 45 to start data collection of the contact angle of the liquid to be tested at different positions on the lifting platform 45.

[0056] When the injection unit 6 drops the liquid to be tested onto the lifting stage 45, the controller starts the cylinder 1 51 to extend and retract to drive the cylinder 2 52 and the camera 1 53 to rise and fall in the vertical direction until they are adjusted to the appropriate position. Then, the cylinder 2 52 is started to extend and retract to drive the camera 1 53 to adjust the position in the front and rear directions. After adjusting to the position directly above the droplet to be tested, the image of the droplet in the observation and analysis software is clear. If not, the magnification and focal length of the camera 1 53 are adjusted to make the image of the droplet clear. The cylinder 3 54 is started to change the distance between the camera 2 55 and the droplet to be tested until the image of the droplet in the camera 2 55 is clear. The droplet to be tested is clearly imaged under the illumination of the light source 3. The top view and the horizontal view are tested simultaneously to improve the accuracy of measuring products with concave or irregular surfaces.

[0057] When the injection tube 67 is adjusted to the drop point above the designated drop point of the lifting platform 45 by starting the cylinder 42, the staff changes the drop angle of the injection tube 67 by rotating the rotating plate 63, and performs the drop operation after the adjustment. When it is necessary to replace the test liquid to clean the injection tube 67, clean water is introduced through the liquid inlet pipe 65 and the clean water passes through the push block 66 and is guided to the inside of the conduit 617. When the conduit 617 and the moving plate 612 are moved downward by pushing the push block 66, the magnetic block 611 moves downward synchronously. During the movement of the magnetic block 611, the magnetic flux passing through the coil 68 is generated. The controller detects the positive current and guides the positive current into the electromagnet 69, so that the electromagnet 69 generates the same polarity as the magnetic block 611, thereby pushing the two magnetic blocks 611 to approach each other and enter the conduit 617 to block the conduit 617. Under the action of pressure, the clean water inside the injection tube 67 is pushed out from the bottom to perform a clean water cleaning. The two resistor blocks 614 are moved closer to each other with the magnetic blocks 611 under the action of the iron blocks. On the other hand, the moving plate 612 drives the circular frame 616 to move downward, and the cleaning ball 615 rolls along the inner wall of the injection tube 67 to clean and It absorbs the growth attached to the inner wall of the injection tube 67, thereby cleaning the inner wall of the injection tube 67. When a downward stroke is completed, the guide tube 617 and the movable plate 612 are moved upward by pulling the push block 66. At this time, the magnetic block 611 generates a reverse current in the coil 68. When the controller detects the reverse current in the coil 68, it blocks the reverse current from flowing to the electromagnet 69. At this time, the electromagnet 69 is no longer magnetic. Under the action of the spring 610, the magnetic block 611 moves back to the opposite direction of the electromagnet 69 and resets. The magnetic block 611 drives the resistor block 614 to reset, so that the resistor blocks 614 move away from each other, and the controller guides a part of the reverse When the current is passed through the double-layer metal sheet 613, the double metal sheet 613 is energized to generate heat and expand, and the metal sheet with a high expansion coefficient will bend toward the metal sheet with a low expansion coefficient, thereby forming a section, which is squeezed during the rolling process of the cleaning ball 615 to scrape off the adsorbed droplets, thereby improving the secondary adsorption capacity of the cleaning ball 615 and improving the cleaning effect of the inner wall of the injection tube. Another part of the reverse current is passed through the resistor block 614, so that the resistor block 614 is heated to accelerate the evaporation of the liquid to be tested on the resistor block 614, so that the inside of the injection tube 67 is quickly dried, thereby achieving cleaning of the injection tube 67 while accelerating the evaporation inside the injection tube 67. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A dual-vision contact angle tester, characterized in that: The dual-vision contact angle test instrument comprises a protective cover (1), a frame (2), a light source (3), a bearing unit (4), an imaging unit (5) and an injection unit (6), wherein the frame (2) is placed on a horizontal foundation, the frame (2) is provided with two groups of large and small curved frames, the protective cover (1) is sleeved outside the frame (2), the light source (3) is fixedly mounted on the inner surface of an end face of the protective cover (1) perpendicular to the horizontal axis, the bearing unit (4) is fixedly mounted on an end of the frame (2) away from the horizontal foundation, the imaging unit (5) has two groups, the two groups of imaging units (5) are respectively fixedly connected to the large and small curved frames of the frame (2), the injection unit (6) is fixedly connected to the frame (2), and the injection unit (6) has the functions of dripping the liquid to be tested and self-cleaning; The injection unit (6) comprises a connecting plate (61), a cylinder (4) (62), a rotating plate (63), a telescopic motor (3) (64), a liquid inlet pipe (65), a push block (66), an injection pipe (67), a coil (68), an electromagnet (69), a spring (610), a magnetic block (611), a moving plate (612), a double-layer metal sheet (613), a resistance block (614), a cleaning ball (615), a circular frame (616) and a guide tube (617). The connecting plate (61) is fixedly mounted on the end of the large curved frame of the frame (2), and the fixed end of the cylinder (4) (62) is fixedly mounted. The connecting plate (61) is mounted on one end of the large curved frame away from the frame (2); the telescopic end of the cylinder (62) is rotatably connected to the rotating plate (63); the fixed end of the telescopic motor (64) is fixedly mounted on the rotating plate (63); the liquid inlet pipe (65) is fixedly mounted on the telescopic end of the telescopic motor (64); one end of the push block (66) is connected to the liquid inlet pipe (65) through a hose; the other end is connected to one end of the conduit (617); the conduit (617) is slidably mounted inside the injection tube (67); the other end of the conduit (617) is connected to the movable plate (612) through a straight rod. ), the injection tube (67) is composed of an inner tube and an outer tube, the coil (68) is evenly wound on the outer surface of the inner tube of the injection tube (67), the electromagnet (69) is fixedly installed on the outer surface of the end of the movable plate (612) away from the horizontal base, one end of the spring (610) is fixedly connected to the electromagnet (69), and the other end is fixedly connected to the magnetic block (611), the magnetic block (611) is slidably connected to the guide tube (617), the movable plate (612) is slidably installed inside the injection tube (67), and one end of the double-layer metal sheet (613) is close to the movable plate (612). The surface of one end near the horizontal foundation is fixedly connected, the resistance block (614) is connected to the movable plate (612) through an iron block, the iron block is installed directly below the magnetic block (611), the cleaning ball (615) is rotatably installed on the end of the circular frame (616) near the horizontal foundation, the end of the circular frame (616) away from the horizontal foundation is fixedly connected to the end of the movable plate (612) near the horizontal foundation, the electromagnet (69) is electrically connected to the coil (68), the double-layer metal sheet (613) is electrically connected to the coil (68), and the resistance block (614) is electrically connected to the coil (68).

2. A dual-vision contact angle tester according to claim 1, characterized in that: The bearing unit (4) comprises a telescopic motor 1 (41), a slide rail 1 (42), a telescopic motor 2 (43), a slide rail 2 (44) and a lifting platform (45), wherein the slide rail 1 (42) is fixedly mounted on an end of the frame (2) away from the horizontal base, the fixed end of the telescopic motor 1 (41) is fixedly mounted on one end of the slide rail 1 (42), the telescopic end of the telescopic motor 1 (41) is fixedly connected to the slide rail 2 (44), the fixed end of the telescopic motor 2 (43) is fixedly mounted on one end of the slide rail 2 (44), the telescopic end of the telescopic motor 2 (43) is fixedly connected to the lifting platform (45), the slide rail 1 (42) is slidably connected to the slide rail 2 (44), the slide rail 1 (42) and the slide rail 2 (44) are mounted perpendicular to each other, the lifting platform (45) is slidably connected to the slide rail 2 (44), and the lifting platform (45) is electrically connected to a controller.

3. A dual-vision contact angle tester according to claim 1, characterized in that: The imaging unit (5) comprises a cylinder 1 (51), a cylinder 2 (52), a camera 1 (53), a cylinder 3 (54) and a camera 2 (55); the fixed end of the cylinder 1 (51) is fixedly mounted on a large curved frame of a frame (2); the telescopic end of the cylinder 1 (51) is fixedly connected to the fixed end of the cylinder 2 (52); the camera 1 (53) is fixedly mounted on the telescopic end of the cylinder 2 (52) parallel to a vertical axis; the fixed end of the cylinder 3 (54) is fixedly mounted on a small curved frame of the frame (2); and the camera 2 (55) is fixedly connected to the telescopic end of the cylinder 3 (54) parallel to a horizontal axis.

4. A dual-vision contact angle tester according to claim 1, characterized in that: The light source (3) is coaxially placed with the second camera (55).

5. A dual-vision contact angle tester according to claim 2, characterized in that: The lifting platform (45) is provided with a positioning clip.

6. A dual-vision contact angle tester according to claim 1, characterized in that: The expansion coefficient of the metal sheet at one end of the double-layer metal sheet (613) close to the cleaning ball (615) is smaller than that of the metal sheet at one end away from the cleaning ball (615).

7. A dual-vision contact angle tester according to claim 1, characterized in that: The two magnetic blocks (611) are initially positioned flush with the inner wall of the catheter (617).

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