CN110736681A - Method and device for detecting behavior evolution of liquid drops among multiple angles and variable slits under temperature control condition - Google Patents
Method and device for detecting behavior evolution of liquid drops among multiple angles and variable slits under temperature control condition Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting the evolution behavior of liquid drops among multiple angles and variable slits under the condition of temperature control, and at present, detection methods and devices for detecting the evolution behavior of liquid drops among different angles and different slits under the condition of environmental temperature change are not available.
Description
Technical Field
The invention belongs to the technical field of liquid behavior change monitoring, and particularly relates to a method and a device for detecting behavior evolution of liquid drops among multiple angle variable slits under temperature control conditions.
Background
At present, the micro-lubrication technology is accepted by the scientific field and the industry and becomes typical green cooling and lubricating technology, so the research on the state and the behavior evolution of liquid drops in slits with friction temperature is very important.
However, there are no relevant monitoring devices, such as the invention patent with application number of CN201510278140.x, which discloses sensing devices, and a sensing system and a sensing method using the same, and the patent mainly focuses on the sensing research of a liquid sample between micro-nano slits, and the analysis of a corresponding chemical detection sensor and a slit structure, the materials of the slits formed by the devices and the methods are inconvenient to replace, and the difference of state evolution behaviors of droplets at different temperatures is not considered.
Disclosure of Invention
The invention provides methods and devices for simulating and detecting the behavior evolution of liquid drops among different angles and different slits under the condition of temperature control, aiming at the condition that methods and devices for detecting the evolution behavior of the liquid drops among different angles and different slits under the condition of environmental temperature change do not exist at present, the method can simulate and detect the behavior evolution processes of coalescence, separation, flow form, spreading characteristic and the like of the liquid drops under single or parallel conditions (temperature, angle, material, surface topography, slit spacing and the like), and realize the seepage detection of the liquid drops to transonic, molecular, nano, micron and millimeter-level slits.
The invention discloses a method for detecting the behavior evolution of liquid drops among multiple angles and variable slits under the condition of temperature control, which comprises the following steps:
and , opening a protective cover of the protective cover, controlling the electromagnet to be powered off by the controller, controlling the vertical servo motor to rotate by the controller so as to drive the screw rod to rotate, driving the sliding block, the upper plate support seat and the upper plate support to synchronously vertically slide upwards, wherein the upper plate support slides along the sliding groove on the hinged shaft of the hinge type clamping groove, fastening the upper plate on the bottom surface of the upper plate support through a buckle, fastening the lower plate on the top surface of the heat transfer table through a buckle, controlling the vertical servo motor and the horizontal servo motor to reset by the controller, horizontally arranging the upper plate and the lower plate after resetting, and keeping the distance between the upper plate and the lower plate at 5cm, wherein the horizontal servo motor drives the heat transfer table to rotate for resetting.
Step two: and adjusting the high-speed microscope to enable the focal length to be positioned at the central part of the downloading plate. And (3) dripping a solution to be detected into the central part of the lower support plate by using a 5-microliter micro propeller, recording the initial form evolution of the liquid drop through a high-speed microscope, and carrying out behavior evolution detection on the liquid drop on the flat plate or between the slits according to the experimental requirements after the initial form evolution is finished.
(1) Go up, download the board interval and keep unchangeable, the electro-magnet keeps the outage state, closes the safety cover of safety cover, carries out the last liquid droplet action evolution detection of flat board:
① detecting the evolution of the liquid drop behavior on the flat plate under the temperature control condition, wherein the controller sends a temperature control instruction to the temperature control box, and simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds the temperature back to the temperature control box to adjust the temperature in real time, so as to ensure that the temperature of the liquid drop reaches the set temperature, and record the evolution state of the liquid drop by using a high-speed microscope.
② detecting the evolution of the liquid drop behavior on the flat plate when the angle changes continuously under the temperature control condition, wherein the controller sends a temperature control instruction to the temperature control box, simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds the temperature back to the temperature control box to adjust the temperature in real time, so as to ensure that the temperature of the liquid drop reaches a set temperature, then the controller sends an angle control instruction to the horizontal servo motor, the horizontal servo motor drives the lower support plate to start deflection, and simultaneously the high-speed microscope records the evolution state of the liquid drop.
(2) Closing the protective cover of the protective cover, and detecting the behavior evolution of the liquid drop between the slits:
① detection of liquid drop behavior evolution under constant angle and continuous variation of slit distance, the controller sends a distance control command to the vertical servo motor, the vertical servo motor drives the upper carrier plate to approach the lower carrier plate, and stops when the distance between the upper and lower carrier plates reaches a preset initial value, then the controller sends a temperature control command to the temperature control box, and simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds back the temperature to the temperature control box to perform real-time temperature adjustment to ensure that the liquid drop temperature reaches the preset temperature, then the controller controls the electromagnet to be electrified, the electromagnet is attracted and fixed with the hinge shaft of the hinge type clamping groove, the controller controls the horizontal servo motor to drive the heat transfer table to rotate to the preset angle (the preset angle is values between-60 degrees and 60 degrees from the horizontal plane), at this time, the heat transfer table drives the electromagnet to swing through the hinge, then drives the upper carrier plate bracket fixed with the hinge sleeve through the hinge shaft of the hinge type clamping groove, so that the upper carrier plate bracket and the heat transfer table are kept in parallel state, finally, the controller controls the power off, the controller sends a distance control command to the vertical servo motor, and starts driving the liquid drop evolution of the microscope to start to record.
② detection of liquid drop behavior evolution under the condition of constant slit spacing and continuous angle change, the controller sends a spacing control command to the vertical servo motor, the vertical servo motor drives the upper support plate to start to approach the lower support plate until the spacing between the upper and lower support plates reaches a set value, then the controller sends a temperature control command to the temperature control box, and simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds back the temperature to the temperature control box to adjust the temperature in real time, so as to ensure that the temperature of the liquid drop reaches the set temperature.
③ detecting the evolution of liquid drop behavior when the slit angle and the gap change successively under the temperature control condition, i.e. the controller sends a gap control instruction to the vertical servo motor, the vertical servo motor drives the upper carrier plate to approach the lower carrier plate, and the gap between the upper carrier plate and the lower carrier plate stops when the set initial value is reached, then the controller sends a temperature control instruction to the temperature control box, and simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds back the temperature to the temperature control box to adjust the temperature in real time, and ensures that the temperature of the liquid drop reaches the set temperature, II, the controller controls the electromagnet to be electrified and sends an angle control instruction to the horizontal servo motor, and the upper carrier plate and the lower carrier plate start deflecting simultaneously, when the angle deflects by 2 degrees, the controller controls the horizontal servo motor to suspend the deflection and controls the electromagnet to be powered off, and sends a gap control instruction to the vertical servo motor, the vertical servo motor drives the upper carrier plate to start to leave the lower carrier plate, and when the gap increases by 0.2mm, the controller controls the vertical servo motor to suspend, III, and repeats II, the slit angle and the gap angle and.
Step three: extracting the outline of the liquid drop by processing the image shot by the high-speed microscope to obtain the initial form of the liquid drop and the instantaneous forms of different time points; and comparing the distance change of the liquid flow of the two adjacent frames of images in the flow direction, and combining the sampling frequency of the microscope to obtain the instantaneous speed of the liquid drop in the flow direction.
The liquid drop state behavior evolution refers to the change process of the flow form, the flow speed and the flow direction of the liquid drop on a flat plate or between slits.
The device for detecting the liquid drop behavior evolution between the multi-angle variable slits under the condition of temperature control comprises a support module, a slit spacing adjusting module, an angle deflection control module and a fuzzy PID temperature control module, wherein the support module comprises an upright post, a base and a protective cover, the upright post is fixed on the base, a sliding groove in the side part of the protective cover and the protective cover form a sliding pair, a lifting handle is arranged at the top of the protective cover, and the bottom of the protective cover is embedded into a clamping groove of the base.
The slit interval adjusting module comprises a vertical servo motor, a mounting frame, a sliding block guide frame, an upper loading plate support seat, an upper loading plate support, a hinge type clamping groove and an eddy current displacement sensor, wherein the mounting frame is fixed on the side face of an upright column, the sliding block guide frame is fixed on the mounting frame, a base of the vertical servo motor is fixed on the mounting frame, an encoder is arranged on the vertical servo motor, an output shaft of the vertical servo motor is fixed with a lead screw, a nut block and the lead screw form a spiral pair and are fixed with the sliding block, the lead screw is supported on the mounting frame through a bearing, the sliding block and the sliding block guide frame form a sliding pair, the upper loading plate support seat is fixed on the sliding block, an extension shaft fixed in the middle of the upper loading plate support is supported at the bottom of the upper loading plate support seat through the bearing, the hinge type clamping groove comprises a hinge sleeve and a hinge shaft, the end of the upper loading plate support is fixed with the hinge sleeve, the hinge sleeve and the rotating pair is formed by the hinge sleeve, the middle of the hinge shaft is provided with the sliding groove, the hinge shaft is made of a magnetic material, the bottom of the upper loading plate support is provided with a buckle, the mounting hole is provided with the eddy current displacement sensor.
The angle deflection control module comprises a horizontal servo motor, a motor base, a heat transfer table, a hinge and an electromagnet, wherein the horizontal servo motor and the electromagnet are controlled by a controller, the base of the horizontal servo motor is fixed on the motor base, an output shaft of the horizontal servo motor is fixed with a connecting shaft, the motor base is fixed on the base, the connecting shaft and the motor base form a rotating pair and are fixed with the middle of the heat transfer table, the end of the heat transfer table is connected with the lower portion of the electromagnet through the hinge, the upper portion of the electromagnet and a sliding groove of a hinged shaft form a sliding pair, a buckle is arranged on the top surface of the heat transfer table, the center distance between the hinge and a hinged shaft of a hinge type clamping groove is equal to the center distance between the connecting shaft and an extension shaft of an upper loading plate support, and the center distance between the hinge and a hinged shaft is equal to the center distance.
The fuzzy PID temperature control module comprises a temperature control box and a thermocouple sensor; the temperature control box is fixed on the bottom surface of the heat transfer table; the thermocouple sensor is fixed in the heat transfer table, monitors the temperature of the heat transfer table and transmits a temperature signal to the temperature control box.
The protective cover is made of a transparent acrylic plate.
And a limiting plate is fixedly arranged on the slide block guide frame.
A pointer is fixed on the extending shaft, and a protractor is fixed on the upper loading plate bracket seat; the protractor is marked with a circumference scale of 0-180 degrees.
The horizontal servo motor drives the carrier plate to incline within an angle range of-60 degrees to 60 degrees.
The temperature control range of the temperature control box is 40-250 ℃.
The controller is communicated with the human-computer interface; a temperature, angle and interval setting button is arranged on the human-computer interface, and the real-time states of the temperature, the angle and the interval are fed back; and a corner inching control button and a corner automatic control button of the vertical servo motor and the horizontal servo motor are also arranged on the human-computer interface.
The invention has the following beneficial effects:
according to the invention, the behavior evolution characteristics of the liquid drop states at different temperatures can be realized through the temperature control module; the liquid drop state behavior evolution characteristics under the states of a flat plate and a slit can be realized by utilizing the slit interval adjusting module; the liquid drop state behavior evolution characteristic under a static multi-angle or dynamic angle change can be realized by utilizing the angle deflection control module; the liquid drop state behavior evolution characteristic under multiple conditions can be realized by mutually coupling the temperature control module, the slit distance adjusting module and the angle deflection control module; in the implementation, the behavior evolution characteristics of the liquid drops on different carrier plate materials (such as ceramic, organic glass, stainless steel and the like, and the upper and lower carrier plates are made of the same material) can be compared, or the behavior evolution characteristics of the liquid drops between the upper and lower carrier plates can be compared; similarly, the liquid drop state behavior evolution characteristics of solutions with different proportions and different compositions can be compared in the implementation. According to the invention, by analyzing the behavior evolution characteristics of the liquid drops among the multi-angle variable slits under the temperature control condition, a theoretical basis can be provided for researching the mechanism analysis of oil mist lubrication or micro-lubrication application, and the principle is simple, convenient and understandable and has strong practicability.
Drawings
Fig. 1 is a perspective view of the overall structure of the device of the present invention.
Fig. 2-1 is a side view of of the device of the present invention.
Fig. 2-2 is another side views of the device of the present invention.
Fig. 3 is a schematic diagram of a high-speed microscope for shooting the behavior of the droplet when detecting the evolution of the behavior of the droplet according to the present invention.
FIG. 4-1, FIG. 4-2 and FIG. 4-3 are schematic diagrams of the evolution process of the behavior of the liquid drop on the flat plate when the angle is continuously changed under the temperature control condition.
5-1, 5-2 and 5-3 are schematic diagrams of the evolution process of droplet behavior under the temperature control condition with constant angle and continuous variation of slit spacing.
6-1, 6-2 and 6-3 are schematic diagrams of the evolution process of the droplet behavior under the temperature control condition when the slit spacing is unchanged and the angle is continuously changed.
Detailed Description
The invention is further described with reference to the following figures.
As shown in FIG. 1, FIG. 2-2 and FIG. 3, the device for detecting behavior evolution of multi-angle variable slit droplet under temperature control condition comprises a support module, a slit pitch adjustment module, an angle deflection control module and a fuzzy PID temperature control module.
The support module comprises an upright post 4, a base 1 and a protective cover 10, wherein the upright post 4 is fixed on the base 1, the upright post 4 is mainly used for supporting the slit spacing adjusting module, the base 1 is mainly used for supporting the angle deflection control module, a sliding groove in the side portion of the protective cover 10 and the protective cover 12 form a sliding pair, the protective cover 12 can move up and down to be opened or closed, a lifting handle 11 is arranged at the top of the protective cover 10, the bottom of the protective cover 10 is embedded into a clamping groove of the base 1, the whole device is enclosed in a closed space, and the influence of the outside on the.
The slit spacing adjusting module comprises a vertical servo motor 9, a mounting frame 7, a slider guide frame 8, an upper loading plate support seat 5, an upper loading plate support 14, a hinge type clamping groove 15 and an eddy current displacement sensor 13, wherein the mounting frame 7 is fixed on the side face of an upright post 4, the slider guide frame 8 is fixed on the mounting frame 7, a limiting plate is fixedly arranged on the slider guide frame 8, a base of the vertical servo motor 9 is fixed on the mounting frame 7, an encoder 6 is arranged on the vertical servo motor 9 and used for measuring the rotation angle of the vertical servo motor 9, an output shaft of the vertical servo motor 9 is fixed with a screw rod, a screw rod and the screw rod form a screw pair and are fixed with the slider, the screw rod is supported on the mounting frame 7 through a bearing, the slider and the slider guide frame 8 form a sliding pair, the upper loading plate support seat 5 is fixed on the slider and can move up and down along the slider guide frame 8, an extension shaft fixed at the middle part of the upper loading plate support 14 is supported at the bottom of the upper support frame 5 through a bearing, the hinge type 15 comprises a hinge sleeve and a hinge shaft, the end 14 of the hinge sleeve is fixed with the hinge sleeve, the hinge sleeve and the hinge sleeve, the hinge shaft is fixed with the hinge sleeve, the upper loading plate support 14 and provided with a signal control point of the eddy current displacement sensor 14, the upper loading plate support 14 is provided with a coplanar control point control device, the eddy current displacement sensor 14, the upper loading plate, the vortex displacement sensor 14, the upper loading.
The angle deflection control module comprises a horizontal servo motor 3, a motor base 2, a heat transfer table 18, a hinge 17 and an electromagnet 16, wherein the horizontal servo motor 3 and the electromagnet 16 are controlled by a controller, the base of the horizontal servo motor 3 is fixed on the motor base 2, an output shaft of the horizontal servo motor 3 is fixed with a connecting shaft, the motor base 2 is fixed on the base 1, the connecting shaft and the motor base 2 form a rotating pair and are fixed with the middle part of the heat transfer table 18, the end of the heat transfer table 18 is connected with the lower part of the electromagnet 16 through the hinge 17, the upper part of the electromagnet 16 and a sliding groove of a hinged shaft form a sliding pair, a buckle is arranged on the top surface of the heat transfer table 18 and used for installing a lower carrier plate 22, the center distance between the hinge 17 and the hinged shaft of the hinge type clamping groove 15 is equal to the center distance between the connecting shaft and an extending shaft of the upper carrier plate support 14, and the center distance between the hinged shaft of the hinge 17 and the connecting shaft is equal to the center distance between the hinged shaft of the upper carrier plate support.
The fuzzy PID temperature control module comprises a temperature control box 19 and a thermocouple sensor; the temperature control box 19 is fixed on the bottom surface of the heat transfer table 18, and changes and controls the temperature of the heat transfer table 18; the thermocouple sensor is fixed in the heat transfer table 18, monitors the temperature of the heat transfer table 18 in real time, and transmits a temperature signal to the temperature control box 19.
The output of the PID regulator of the fuzzy PID temperature control module is as follows:
wherein e (t) is the PID regulator input; kpIs the proportionality coefficient, KiTo integrate the time constant, KdIs the differential time constant. The control principle is mainly that according to the preset temperature error e and the error change rate ec, the parameter K in PID control is modified on line by using a fuzzy controllerp、Ki、KdSo as to meet different requirements on control parameters at different e and ec, thereby obtaining a control quantity u (t), completing the constant temperature control of the heater and further controlling the temperature of the heat transfer table and the temperature of liquid drops. The fuzzy PID control can effectively solve the problem of temperature deviation caused by non-linear factors such as environment and the like.
The method for detecting the behavior evolution of the liquid drops among the multiple variable slits under the condition of temperature control specifically comprises the following steps:
example 1: as shown in fig. 4-1, 4-2 and 4-3, the behavior evolution of the droplets on the plate when the angle is continuously changed under the temperature control condition is detected:
, opening a protection cover of the protection cover 10, controlling the electromagnet 16 to be powered off by the controller, controlling the vertical servo motor to rotate by the controller so as to drive the screw rod to rotate, driving the sliding block, the upper plate support seat and the upper plate support to synchronously vertically slide upwards, wherein the upper plate support slides along the sliding groove on the hinged shaft of the hinge type clamping groove, fastening the upper support plate 21 on the bottom surface of the upper support plate support through a buckle, fastening the lower support plate 22 on the top surface of the heat transfer table through a buckle, finally controlling the vertical servo motor and the horizontal servo motor to be reset by the controller, horizontally arranging the upper plate and the lower plate after being reset, and enabling the interval to be 5cm, wherein the horizontal servo motor 3 drives the heat transfer table to rotate and reset.
And step two, adjusting the high-speed microscope to enable the focal length to be in the central part of the lower carrier plate, dripping a solution to be detected to the central part of the lower carrier plate by using a 5-microliter thruster, recording the initial form evolution of liquid drops by using the high-speed microscope, closing a protective cover of the protective cover after the initial form evolution is finished, setting an angle of 30 degrees and a temperature of 55 ℃ by using a controller, then sending a temperature control instruction to a temperature control box 19 by using the controller, monitoring the temperature of a heat transfer table by using a thermocouple sensor and feeding back the temperature to the temperature control box to perform real-time temperature adjustment to ensure that the temperature of the liquid drops reaches 55 ℃ and is constant, then sending an angle control instruction to a horizontal servo motor 3 by using the controller, driving the lower carrier plate 22 to start deflection.
Step three: extracting the outline of the liquid drop by processing the image shot by the high-speed microscope to obtain the initial form of the liquid drop and the instantaneous forms of different time points; and comparing the distance change of the liquid flow of the two adjacent frames of images in the flow direction, and combining the sampling frequency of the microscope to obtain the instantaneous speed of the liquid drop in the flow direction.
Example 2: as shown in fig. 5-1, 5-2 and 5-3, the behavior evolution of the droplets under the temperature control condition with the constant angle and the continuous variation of the slit pitch is detected:
, opening a protection cover of the protection cover 10, controlling the electromagnet 16 to be powered off by the controller, controlling the vertical servo motor to rotate by the controller so as to drive the screw rod to rotate, driving the sliding block, the upper plate support seat and the upper plate support to synchronously vertically slide upwards, wherein the upper plate support slides along the sliding groove on the hinged shaft of the hinge type clamping groove, fastening the upper support plate 21 on the bottom surface of the upper support plate support through a buckle, fastening the lower support plate 22 on the top surface of the heat transfer table through a buckle, finally controlling the vertical servo motor and the horizontal servo motor to be reset by the controller, horizontally arranging the upper plate and the lower plate after being reset, and enabling the interval to be 5cm, wherein the horizontal servo motor 3 drives the heat transfer table to rotate and reset.
Adjusting the high-speed microscope to enable the focal distance to be in the center of the lower carrier plate, dripping a solution to be tested to the center of the lower carrier plate by using a 5 mu l micro propeller, recording the initial form evolution of liquid drops by using the high-speed microscope, closing a protective cover of the protective cover after the initial form evolution is finished, setting the interval to be 0.1mm by using a controller, then sending an interval control instruction to a vertical servo motor 9 by using the controller, driving an upper carrier plate 21 to approach the lower carrier plate 22 by using the vertical servo motor, stopping until the interval between the upper carrier plate 21 and the lower carrier plate 22 reaches 0.1mm, then sending a temperature control instruction to a temperature control box 19 by using the controller according to the set temperature 55 ℃, monitoring the temperature of a heat transfer table by using a thermocouple sensor and feeding back the temperature to a temperature control box 19 for real-time temperature adjustment, ensuring that the temperature of the liquid drops reaches 55 ℃ and is constant, then controlling an electromagnet 16 to be powered on, attracting and fixing an articulated shaft of the electromagnet and a hinge type clamping groove, controlling the horizontal servo motor to drive the heat transfer table to rotate to a set angle of 0 DEG, and finally sending a micro-adjusting the interval of the upper carrier plate 21 and the vertical carrier plate 22 to start to be capable of controlling the vertical carrier plate 22 to be powered off and the interval of the vertical carrier plate 22 to be capable of controlling the vertical carrier plate to be in the vertical carrier plate 22 and capable.
Step three: extracting the outline of the liquid drop by processing the image shot by the high-speed microscope to obtain the initial form of the liquid drop and the instantaneous forms of different time points; and comparing the distance change of the liquid flow of the two adjacent frames of images in the flow direction, and combining the sampling frequency of the microscope to obtain the instantaneous speed of the liquid drop in the flow direction.
Example 3: as shown in fig. 6-1, 6-2 and 6-3, the behavior evolution of the liquid drop under the temperature control condition with the constant slit spacing and the continuous angle change is detected:
and , opening a protective cover of the protective cover, controlling the electromagnet to be powered off by the controller, controlling the vertical servo motor to rotate by the controller so as to drive the screw rod to rotate, driving the sliding block, the upper plate support seat and the upper plate support to synchronously vertically slide upwards, wherein the upper plate support slides along the sliding groove on the hinged shaft of the hinge type clamping groove, fastening the upper plate on the bottom surface of the upper plate support through a buckle, fastening the lower plate on the top surface of the heat transfer table through a buckle, controlling the vertical servo motor and the horizontal servo motor to reset by the controller, horizontally arranging the upper plate and the lower plate after resetting, and keeping the distance between the upper plate and the lower plate at 5cm, wherein the horizontal servo motor drives the heat transfer table to rotate for resetting.
Adjusting the high-speed microscope to enable the focal length to be in the center of the lower loading plate, dripping a solution to be detected to the center of the lower loading plate by using a 5 mu l micro propeller, recording the initial form evolution of liquid drops by using the high-speed microscope, closing a protective cover of the protective cover after the initial form evolution is finished, setting the interval to be 0.1mm by using a controller, then sending an interval control instruction to the vertical servo motor 9 by using the controller, driving the upper loading plate 21 to start to approach the lower loading plate 22 by using the vertical servo motor 9, stopping until the interval between the upper loading plate 21 and the lower loading plate 22 reaches 0.1mm, then sending a temperature control instruction to the temperature control box 19 by using the controller according to a set temperature parameter of 55 ℃, monitoring the temperature of the heat transfer table by using a thermocouple sensor and feeding back to the temperature control box 19, performing real-time temperature adjustment, ensuring that the temperature of the liquid drops reaches 55 ℃ and is constant, finally controlling the electromagnet to be electrified by using the controller, sending an angle control instruction to the horizontal servo motor 3 according to a set angle parameter of 30 ℃, driving the upper loading.
Step three: extracting the outline of the liquid drop by processing the image shot by the high-speed microscope to obtain the initial form of the liquid drop and the instantaneous forms of different time points; and comparing the distance change of the liquid flow of the two adjacent frames of images in the flow direction, and combining the sampling frequency of the microscope to obtain the instantaneous speed of the liquid drop in the flow direction.
Claims (9)
1. The method for detecting the behavior evolution of the liquid drops among the multi-angle variable slits under the condition of temperature control is characterized by comprising the following steps of: the method comprises the following specific steps:
step , opening a protection cover of the protection cover, controlling the electromagnet to be powered off by a controller, controlling the vertical servo motor to rotate by the controller, driving a screw rod to rotate, driving a sliding block, an upper loading plate bracket seat and an upper loading plate bracket to synchronously vertically slide upwards, wherein the upper loading plate bracket slides along a sliding groove on a hinged shaft of a hinge type clamping groove, then fastening an upper loading plate on the bottom surface of the upper loading plate bracket through a buckle, and fastening a lower loading plate on the top surface of a heat transfer table through a buckle;
step two: adjusting the high-speed microscope to enable the focal length to be positioned at the central part of the downloading plate; dripping a solution to be detected into the center of the lower support plate by using a 5-microliter micro propeller, recording the initial form evolution of the liquid drops by using a high-speed microscope, and carrying out liquid drop behavior evolution detection on the flat plate or between the slits according to the experimental requirements after the initial form evolution is finished;
(1) go up, download the board interval and keep unchangeable, the electro-magnet keeps the outage state, closes the safety cover of safety cover, carries out the last liquid droplet action evolution detection of flat board:
① detecting the evolution of the behavior of the liquid drop on the flat plate under the temperature control condition, wherein the controller sends a temperature control instruction to the temperature control box, and simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds the temperature back to the temperature control box to adjust the temperature in real time, so as to ensure that the temperature of the liquid drop reaches the set temperature, and the evolution state of the liquid drop is recorded by using a high-speed microscope;
② detecting the evolution of the behavior of the liquid drop on the flat plate when the angle changes continuously under the temperature control condition, wherein the controller sends a temperature control instruction to the temperature control box, simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds the temperature back to the temperature control box to adjust the temperature in real time, so as to ensure that the temperature of the liquid drop reaches a set temperature, then the controller sends an angle control instruction to the horizontal servo motor, the horizontal servo motor drives the lower support plate to deflect, and simultaneously the high-speed microscope records the evolution state of the liquid drop;
(2) closing the protective cover of the protective cover, and detecting the behavior evolution of the liquid drop between the slits:
① detecting the evolution of droplet behavior under constant angle and continuous variation of slit distance, wherein the controller sends a distance control command to a vertical servo motor, the vertical servo motor drives an upper carrier plate to approach a lower carrier plate until the distance between the upper carrier plate and the lower carrier plate reaches a preset initial value, then the controller sends a temperature control command to a temperature control box, simultaneously monitors the temperature of a heat transfer table through a thermocouple sensor and feeds back the temperature to the temperature control box to adjust the temperature in real time, and ensures that the droplet temperature reaches the preset temperature;
② detecting the evolution of the droplet behavior when the slit spacing is not changed but the angle is continuously changed, firstly, the controller sends a spacing control instruction to the vertical servo motor, the vertical servo motor drives the upper support plate to start to approach the lower support plate until the spacing between the upper support plate and the lower support plate reaches a set value, then, the controller sends a temperature control instruction to the temperature control box, simultaneously monitors the temperature of the heat transfer table through the thermocouple sensor and feeds the temperature back to the temperature control box to carry out real-time temperature adjustment to ensure that the temperature of the droplet reaches the set temperature, and finally, the controller controls the electromagnet to be electrified and sends an angle control instruction to the horizontal servo motor, the upper support plate and the lower support plate start to synchronously deflect, and simultaneously, the high-speed microscope records the evolution state of the droplet;
③ detecting the evolution of the droplet behavior when the slit angle and the gap change successively under the temperature control condition, I, sending a gap control instruction to a vertical servo motor by a controller, driving an upper carrier plate to approach a lower carrier plate by the vertical servo motor, and stopping when the gap between the upper carrier plate and the lower carrier plate reaches a set initial value, then sending a temperature control instruction to a temperature control box by the controller, monitoring the temperature of a heat transfer table by a thermocouple sensor and feeding back the temperature to the temperature control box to adjust the temperature in real time, so as to ensure that the droplet temperature reaches the set temperature, II, controlling an electromagnet to be electrified, sending an angle control instruction to a horizontal servo motor, and starting deflection of the upper carrier plate and the lower carrier plate simultaneously, when the angle deflects by 2 degrees, controlling the horizontal servo motor to pause deflection and controlling the electromagnet to be powered off, sending a gap control instruction to the vertical servo motor, driving the upper carrier plate to start to leave the lower carrier plate, when the gap increases by 0.2mm, controlling the vertical servo motor to pause, and repeating the step II, wherein the slit angle and the gap change successively until the angle reach the set value, and the evolution state of the;
step three: extracting the outline of the liquid drop by processing the image shot by the high-speed microscope to obtain the initial form of the liquid drop and the instantaneous forms of different time points; and comparing the distance change of the liquid flow of the two adjacent frames of images in the flow direction, and combining the sampling frequency of the microscope to obtain the instantaneous speed of the liquid drop in the flow direction.
2. The method for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 1, wherein: the liquid drop state behavior evolution refers to the change process of the flow form, the flow speed and the flow direction of the liquid drop on a flat plate or between slits.
3. The device for detecting the liquid drop behavior evolution between the multiple angles and the variable slits under the condition of temperature control comprises a support module, a slit spacing adjusting module, an angle deflection control module and a fuzzy PID temperature control module, and is characterized in that the support module comprises an upright post, a base and a protective cover, wherein the upright post is fixed on the base;
the slit interval adjusting module comprises a vertical servo motor, an installation frame, a sliding block guide frame, an upper loading plate bracket seat, an upper loading plate bracket, a hinge type clamping groove and an eddy current displacement sensor, wherein the installation frame is fixed on the side surface of an upright post;
the angle deflection control module comprises a horizontal servo motor, a motor base, a heat transfer table, a hinge and an electromagnet, wherein the horizontal servo motor and the electromagnet are controlled by a controller, the base of the horizontal servo motor is fixed on the motor base, an output shaft of the horizontal servo motor is fixed with a connecting shaft, the motor base is fixed on the base, the connecting shaft and the motor base form a rotating pair and are fixed with the middle part of the heat transfer table, the end of the heat transfer table is connected with the lower part of the electromagnet through the hinge, the upper part of the electromagnet and a chute of a hinged shaft form a sliding pair, the top surface of the heat transfer table is provided with a buckle, the center distance between the hinge and a hinged shaft of a hinge type clamping groove is equal to the center distance between the connecting shaft and an extension shaft of an upper loading plate bracket, and the center distance between the hinge and a hinged shaft of the hinge type clamping groove;
the fuzzy PID temperature control module comprises a temperature control box and a thermocouple sensor; the temperature control box is fixed on the bottom surface of the heat transfer table; the thermocouple sensor is fixed in the heat transfer table, monitors the temperature of the heat transfer table and transmits a temperature signal to the temperature control box.
4. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: the protective cover is made of a transparent acrylic plate.
5. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: and a limiting plate is fixedly arranged on the slide block guide frame.
6. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: a pointer is fixed on the extending shaft, and a protractor is fixed on the upper loading plate bracket seat; the protractor is marked with a circumference scale of 0-180 degrees.
7. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: the horizontal servo motor drives the carrier plate to incline within an angle range of-60 degrees to 60 degrees.
8. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: the temperature control range of the temperature control box is 40-250 ℃.
9. The device for detecting the behavior evolution of the liquid drop between the multiple variable slits under the temperature control condition as claimed in claim 3, wherein: the controller is communicated with the human-computer interface; a temperature, angle and interval setting button is arranged on the human-computer interface, and the real-time states of the temperature, the angle and the interval are fed back; and a corner inching control button and a corner automatic control button of the vertical servo motor and the horizontal servo motor are also arranged on the human-computer interface.
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