CN110736685A - temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna - Google Patents

temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna Download PDF

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Publication number
CN110736685A
CN110736685A CN201911157704.9A CN201911157704A CN110736685A CN 110736685 A CN110736685 A CN 110736685A CN 201911157704 A CN201911157704 A CN 201911157704A CN 110736685 A CN110736685 A CN 110736685A
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China
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liquid
measured
solid
surface tension
temperature
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申爱琴
王路生
王文真
李震南
杨景玉
吴胜利
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Changan University
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Changan University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0208—Investigating surface tension of liquids by measuring contact angle

Abstract

The invention discloses a device and a method for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature controls, wherein a liquid containing box to be measured is of a box body structure with an open top, the lower part of the liquid containing box to be measured is arranged in a water bath box, a dynamometer is suspended from an output end of a driving mechanism, the output end of the driving mechanism can drive the dynamometer to move up and down, a solid hanging sheet to be measured is suspended from the lower end of the dynamometer, the solid hanging sheet to be measured is positioned above the liquid containing box to be measured, a laser radar ranging scanner is arranged on the side of the solid hanging sheet to be measured, the laser output end on the laser radar ranging scanner is flush with the surface of the liquid to be measured in the liquid containing box to be measured, and the laser radar ranging scanner can scan the contact part when the solid hanging sheet to be measured is in contact with the liquid to be measured.

Description

temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna
Technical Field
The invention belongs to the technical field of chemical measurement, and particularly relates to an device and a method for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature control.
Background
The wetting is common physical phenomena, but the wetting degree of liquid to solid is influenced by the types, properties and surface conditions of liquid and solid, in order to characterize the wetting degree of different liquids to different solids and deeply explore the wetting mechanism between liquid and solid, scholars propose concepts of surface tension and contact angle, measure the surface tension of different liquids and the contact angle between liquid and solid, which are very important for mastering the characteristics of wetting, adhesion, lubricity, diffusivity and the like between liquid and solid.
In the field of highway engineering, the surface energy theory is used for evaluating the adhesion between aggregate and asphalt, which is accepted and advocated by researchers, and the surface tension of liquid and the contact angle between liquid and solid are important parameters in the surface energy theory. Relevant researches show that diseases such as pits, cracks, local subsidence, looseness and the like of the asphalt pavement are related to water damage, the water damage is caused by the fact that water molecules are easier to wet the surface of the aggregate than asphalt molecules, and when the aggregate coated with the asphalt is in a water environment for a long time, the water molecules are contacted and wetted with the aggregate molecules to replace the adhesion of the asphalt. Therefore, the determination of the surface tension of different liquids and the liquid-solid contact angle can effectively judge and evaluate the adhesion force and the surface energy between the liquid and the solid, and further has important engineering significance for selecting more hydrophobic aggregates, more stone-philic asphalt and the like.
At present, there are many methods for measuring the surface tension of a liquid and the contact angle between the liquid and the solid, such as a capillary rise method, a maximum bubble pressure method, a flying ring method, a hanging piece method, a droplet profile method, a droplet weight or droplet volume method, a pull-off method, a surface light scattering method, an electromagnetic suspension method, an oscillation jet method, a capillary wave method, and the like. Among them, the droplet profile method is popular because the principle is simple, the result is intuitive, the method is easy to master, and precise instruments and equipment are sold in the market, but it has the defects of few kinds of measurable liquids, expensive instruments and equipment, high requirements for droplet profile, high requirements for shock resistance level, difficulty in controlling test temperature, incapability of directly measuring surface tension gamma, weakness in measurement of viscous liquid, and the like. For this reason, many patents propose unique improved methods and optimized testing devices based on this method, but most of them also obtain liquid-solid indirect contact angles based on image capturing and post-image processing techniques, and the precision is relatively low. Meanwhile, the patents for researching the surface tension of the liquid and the liquid-solid contact angle based on the hanging piece method are few, and the introduction of an advanced radar or ultrasonic ranging technology is not seen.
The method for measuring the surface tension of the liquid and the liquid-solid indirect antenna based on the hanging piece method has the advantages of simple principle, simplicity and convenience in operation, controllable temperature, suitability for various solutions, convenience in calculating the surface tension gamma, low requirement on external conditions and the like. In the past, the hanging piece method has fewer related instruments, most of the instruments depend on import equipment, and the cost of the equipment is high, so that the advantages of the hanging piece method are completely abandoned. Meanwhile, the liquid-solid indirect contact angle measured by a plurality of devices is still obtained by adopting the technologies of image shooting and post image processing, so that the measurement precision is low, and the time and the labor are extremely wasted.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides devices and methods for synchronously measuring the surface tension of a liquid and a liquid-solid contact angle by temperature control.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
A device for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature control comprises a water bath tank, a liquid containing tank to be measured, a laser radar ranging scanner, a driving mechanism, a dynamometer and a solid hanging piece to be measured, wherein the liquid containing tank to be measured is of a tank structure with an open top, the lower part of the liquid containing tank to be measured is arranged in the water bath tank, the dynamometer is hung at the output end of the driving mechanism, the output end of the driving mechanism can drive the dynamometer to move up and down, the solid hanging piece to be measured is hung at the lower end of the dynamometer and is positioned above the liquid containing tank to be measured, the laser radar ranging scanner is arranged on the side of the solid hanging piece to be measured, the laser output end on the laser radar ranging scanner is flush with the surface of the liquid to be measured in the liquid containing tank, and the laser radar ranging scanner can scan the contact part when the solid.
The liquid tank is transparent, an opening is formed in the top surface of the liquid tank, an extension section is arranged on the inner edge of the opening in a downward mode, the upper end of the liquid containing tank to be measured is connected with the lower end of the extension section in a sealing mode, a groove is formed in the water tank from the top to the bottom of the side of the extension section, the laser radar ranging scanner is arranged in the groove, and a laser emitting end of the laser radar ranging scanner is perpendicular to the extension section.
The shape of the solid hanging piece to be detected is a cuboid, two through holes are symmetrically formed in the upper end of the solid hanging piece to be detected, the solid hanging piece to be detected is hung at the lower end of the dynamometer through the two through holes and the thin line, the bottom surface of the solid hanging piece to be detected is in a horizontal state, and a plurality of horizontal marking lines are arranged at the lower end of the solid hanging piece to be detected from top to bottom.
The bottom of the water bath box is provided with a water outlet, and the top of the water bath box is provided with a water inlet; the water bath box is also provided with a temperature control system for controlling the temperature of the liquid in the water bath box.
The temperature control system comprises a heater, a temperature sensor and a temperature controller, wherein the heater and the temperature sensor are arranged in the water bath tank and are respectively used for heating liquid in the water bath tank and measuring the temperature of the liquid in the water bath tank; the heater and the temperature sensor are both connected with the temperature controller.
The driving mechanism comprises a motor capable of rotating forward and backward, a motor controller is connected to the motor, and the dynamometer is connected with an output shaft of the motor through a thin wire.
Laser radar range finding scanner sets up two, and two laser radar range finding scanners set up about the solid hanging piece symmetry that awaits measuring.
The laser radar ranging system further comprises a computer, and the computer is connected with the laser radar ranging scanner.
The dynamometer adopts an electronic digital display dynamometer.
A method for synchronously measuring the surface tension and the liquid-solid contact angle of a liquid by temperature control, which is carried out by the device for synchronously measuring the surface tension and the liquid-solid contact angle by temperature control, comprises the following steps:
enabling the liquid to be measured in the liquid containing box to be measured to reach a preset temperature;
measuring the weight of the solid hanging piece to be measured;
descending the solid hanging piece to be tested, immersing the solid hanging piece into liquid to be tested, scanning the contact part of the solid hanging piece to be tested and the liquid to be tested by using a laser radar ranging scanner in the process of contacting the solid hanging piece to be tested and the liquid to be tested, and simultaneously recording the measured value of the dynamometer; obtaining an infiltration curve according to a scanning result by a laser radar ranging scanner;
and obtaining a contact angle between the liquid to be detected and the solid hanging piece to be detected by using the infiltration curve, and obtaining the surface tension of the liquid to be detected by using the measured value of the dynamometer and the weight and the size of the solid hanging piece to be detected.
The invention has the following beneficial effects:
the device for synchronously measuring the surface tension and the liquid-solid contact angle of the liquid by temperature control can control the temperature during measurement by arranging the water bath tank so as to keep the temperature of the liquid to be measured in the liquid containing tank to be measured stable. Because the surface tension of the liquid is different at different temperatures, the contact angle between the liquid and the solid is also influenced, and the method has great engineering significance and practical significance for controlling the measurement of the surface tension and the contact angle at different temperatures. The driving mechanism drives the dynamometer to move up and down, and the dynamometer can be used for measuring the surface tension of the solid hanging piece to be measured when the solid hanging piece is contacted with the liquid to be measured; the laser radar range scanner can scan the contact part when the solid hanging piece to be detected contacts with the liquid to be detected, and the liquid-solid indirect contact angle between the solid hanging piece to be detected and the liquid to be detected can be obtained according to the obtained range curve by utilizing the function of the laser radar range scanner that the range curve can be drawn during scanning, and the result of the liquid-solid indirect contact angle is more accurate. The method can be used for synchronously measuring the liquid-solid contact angle while testing the surface tension of the liquid, and does not need to acquire images and perform post-processing on the images. The problem that no instrument can synchronously test the surface tension and the contact angle at present is solved. Meanwhile, the device for synchronously measuring the surface tension of the liquid and the liquid-solid contact angle by temperature control is simple in structure and low in manufacturing cost.
The method for synchronously measuring the surface tension of the liquid and the liquid-solid contact angle by temperature control is carried out by adopting the device, and the method can synchronously realize the synchronous measurement of the surface tension of the liquid and the liquid-solid indirect contact angle without acquiring images and carrying out post-processing on the images, has simple operation process, and can measure the surface tension of the liquid and the liquid-solid indirect contact angle at different temperatures.
Drawings
FIG. 1 is a schematic front view of the temperature-controlled device for simultaneously measuring the surface tension and the liquid-solid contact angle of a liquid according to the present invention;
FIG. 2 is a schematic side view of the temperature-controlled apparatus for simultaneously measuring surface tension and contact angle of liquid according to the present invention;
FIG. 3 is a schematic front view of a solid suspension to be tested according to the present invention;
FIG. 4 is a schematic side view of the solid suspension piece to be tested according to the present invention.
In the figure: 1 is a solid hanging piece to be measured; 1-1 mark line; 2 is a dynamometer; 3 is a thin wire; 4 is the liquid to be measured; 5 is a motor; 6 is a motor controller; 7 is a computer; 8 is a laser radar range scanner; 9 is a box handle; 10 is a power supply; 11 is a temperature controller; 12 is a heater; 13 is a support column; 14 is a liquid containing tank to be measured; 15 is a connecting bolt; 16 is a water bath tank, 16-1 is provided with an opening, 16-2 is provided with an extension section and 16-3 is provided with a groove.
Detailed Description
The following technical solution of the present invention is described in with reference to the accompanying drawings and the following embodiments, which are to be understood as merely illustrative and not restrictive.
The invention aims to provide methods and devices for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature control based on a hanging piece method, and corresponding calculation and test methods, wherein the method and the devices are provided from brand-new visual angles by breaking the limitation of a liquid drop shape method and fully utilizing the prior advanced technology, the advantages of the hanging piece method are exerted, the controllable temperature within the range of 0-100 ℃ is realized, the gamma value of the surface tension is quickly and accurately measured, the contact angle between liquid and solid is accurately measured, the test repeatability is good, the effects of being applicable to various liquids and being low in cost are achieved.
Referring to fig. 1 and 2, the device for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature control of the invention comprises a water bath tank 16, a liquid containing tank 14 to be measured, a laser radar ranging scanner 8, a driving mechanism, a dynamometer 2 and a solid hanging piece 1 to be measured, wherein the liquid containing tank 14 to be measured is of a box structure with an open top, the lower part of the liquid containing tank 14 to be measured is arranged in the water bath tank 16, the dynamometer 2 is hung at the output end of the driving mechanism, the output end of the driving mechanism can drive the dynamometer 2 to move up and down, the solid hanging piece 1 to be measured is hung at the lower end of the dynamometer 2, the solid hanging piece 1 to be measured is positioned above the liquid containing tank 14 to be measured, the laser radar ranging scanner 8 is arranged at the side of the solid hanging piece 1 to be measured, the laser output end of the laser radar ranging scanner 8 is flush with the surface of the liquid 4 to be measured in the liquid containing tank 14 to be measured, and the laser radar ranging.
As a preferred embodiment of the invention, the water bath box 16 is transparent, the top surface of the water bath box 16 is provided with an opening 16-1, the inner edge of the opening 16-1 is downwards provided with an extension section 16-2, the upper end of the liquid containing box 14 to be measured is hermetically connected with the lower end of the extension section 16-2, the water bath box 16 is provided with a groove 16-3 from the top downwards at the side of the extension section 16-2, the laser radar range finder scanner 8 is arranged in the groove 16-3, and the laser emission end of the laser radar range finder scanner 8 is vertical to the extension section 16-2.
Referring to fig. 3 and 4, as a preferred embodiment of the present invention, the shape of the to-be-measured solid hanging piece 1 is a cuboid, two through holes are symmetrically formed in the upper end of the to-be-measured solid hanging piece 1, the to-be-measured solid hanging piece 1 is suspended at the lower end of the dynamometer 2 through the two through holes and the thin wire 3, the bottom surface of the to-be-measured solid hanging piece 1 is in a horizontal state, and a plurality of horizontal marking lines are arranged at the lower end of the to-be-measured solid hanging piece 1 from.
As a preferred embodiment of the present invention, the bottom of the water bath 16 is provided with a water outlet, and the top is provided with a water inlet; the water bath 16 is also provided with a temperature control system for controlling the temperature of the liquid in the water bath 16.
As a preferred embodiment of the present invention, as shown in fig. 1 and 2, the temperature control system includes a heater 12, a temperature sensor and a temperature controller 11, the heater 12 and the temperature sensor being provided in a water bath tank 16 for heating liquid in the water bath tank 16 and for measuring the temperature of the liquid in the water bath tank 16, respectively; the heater 12 and the temperature sensor are both connected to the temperature controller 11.
As a preferred embodiment of the present invention, as shown in fig. 1 and 2, the driving mechanism includes a motor 5 capable of rotating in forward and reverse directions, a motor controller 6 is connected to the motor 5, and the dynamometer 2 is connected to an output shaft of the motor 5 through a thin wire.
As a preferred embodiment of the present invention, as shown in fig. 1, two laser radar ranging scanners 8 are provided, and the two laser radar ranging scanners 8 are symmetrically provided with respect to the solid suspension piece 1 to be measured.
As a preferred embodiment of the invention, the device for synchronously measuring the liquid surface tension and the liquid-solid contact angle by temperature control further comprises a computer 7, the computer 7 is connected with the laser radar ranging scanner 8, and the computer 7 can control the laser radar ranging scanner 8 to work and acquire and display data obtained by the laser radar ranging scanner 8.
As a preferred embodiment of the present invention, an electronic digital display dynamometer is used as the dynamometer 2.
The method for synchronously measuring the surface tension of the liquid and the liquid-solid contact angle by temperature control is carried out by the device for synchronously measuring the surface tension of the liquid and the liquid-solid contact angle by temperature control, and comprises the following processes:
the liquid 4 to be measured in the liquid containing box 14 to be measured reaches the preset temperature;
measuring the weight of the solid hanging piece 1 to be measured;
descending the solid hanging piece 1 to be tested and immersing the solid hanging piece into the liquid 4 to be tested, scanning the contact part of the solid hanging piece 1 to be tested and the liquid 4 to be tested by using a laser radar ranging scanner 8 in the process of contacting the solid hanging piece 1 to be tested and the liquid 4 to be tested, and simultaneously recording the measured value of the dynamometer 2; obtaining an infiltration curve according to the scanning result by the laser radar ranging scanner 8;
and obtaining a contact angle between the liquid to be detected and the solid hanging piece 1 to be detected by using the infiltration curve, and obtaining the surface tension of the liquid to be detected by using the measured value of the dynamometer 2 and the weight and the size of the solid hanging piece 1 to be detected.
Examples
Referring to fig. 1, a water bath box 16 in the device for synchronously measuring liquid surface tension and liquid-solid contact angle by temperature control is a main bearing structure, the whole structure of the water bath box 16 is made of toughened glass and is transparent, a support column 13 is arranged at the bottom of the water bath box 16, a box handle 9.4 support columns 13 are arranged outside the water bath box 16, the bottom of the support column 13 is connected with the bottom of the water bath box 16, the top of the support column 13 is connected with the bottom of a liquid containing box 14 to be measured, the support column 13 bears part of weight of the liquid containing box 14 to be measured, the liquid containing box 14 to be measured is made of copper and has good thermal conductivity so as to facilitate heating and temperature stabilization of the liquid 4 to be measured, the box handle 9 is convenient to carry and move the whole device, an opening 16-1 is arranged on the top surface of the water bath box 16, an extension section 16-2 is arranged at the inner edge of the opening 16-1 downwards, an upper end of the liquid containing box 14 to be measured is connected with the lower end of the extension section 16-2 through a connecting bolt 15 and sealed with the extension section 16-2 to prevent the liquid in the liquid containing box 16-2, a liquid from entering a scanning motor, a scanning motor 16-2, a scanning motor for controlling a scanning radar, a scanning motor for controlling a scanning radar, a scanning motor, a.
It should be noted that the top of the toughened glass box 16 of the water bath box is provided with a liquid inlet, the bottom is provided with a liquid outlet, and during testing, the liquid inlet and the liquid outlet are sealed by rubber plugs; the laser radar range scanner 8 is a main device for measuring the liquid-solid indirect antenna, and has a quick scanning function, when the solid hanging piece 1 to be measured is immersed into the liquid 4 to be measured to 3 marking lines on the liquid, the laser radar range scanners 8 on two sides are simultaneously started to carry out quick scanning; the motor 5 adopts a miniature forward and reverse rotation speed control motor, the motor controller 6 provides power for the motor 5 and controls the opening and closing and forward and reverse rotation of the motor, 2 buttons are arranged on the motor controller 6, 1 button controls the opening and closing of the motor 5, and 1 button controls the forward and reverse rotation of the motor 5 (1 forward rotation is pressed, and then 1 reverse rotation is pressed); the temperature controller 11 can control the heating and heat preservation temperature of the heater 12 according to the temperature information collected by the temperature sensor, an electronic display screen is arranged on the temperature controller 11, and at least 2 buttons (namely an upward temperature regulation button and a downward temperature regulation button) are also arranged on the temperature controller 11, the temperature controller can regulate the temperature of liquid in the water bath tank, the heating or heat preservation can be automatically started according to the set temperature, a power supply connected with the temperature controller is 220V alternating current, and the power supply is provided with a switch to control the electrifying condition.
The method comprises the steps that a dynamometer 2 adopts a digital display dynamometer, a liquid containing box 14 to be measured is made of a copper plate with the thickness of 1-2 mm, marks which do not affect radar scanning are made at a position 100mm away from the inner bottom surface inside the liquid containing box 14 to be measured, liquid such as emulsified asphalt, color paint, ink and the like can be contained in the liquid containing box 14 to be measured, the liquid level of the filled liquid is controlled to be always located at a designated box body mark position, a supporting column 13 is a tempered glass column or a metal column with the diameter of 10mm and the height of 150mm, a fine wire 3 is a thin soft metal wire with the diameter of 1mm, the length of the fine wire connected to the upper portion of the electronic digital display dynamometer meets the requirement that the electronic digital display dynamometer can be suspended above 20mm from a motor, the length of the fine wire connected to the lower portion of the electronic digital display dynamometer is capable of controlling the distance of at least 2mm from the bottom surface of the liquid level to be measured of the solid hanging piece 1 to be measured and can bear the weight of the electronic digital display dynamometer and the solid hanging piece to be measured, the laser head is capable of 10mm, the laser ranging from the laser head, the laser head is capable of being attached to the laser scanning, the laser ranging from the laser head, the laser head is capable of being attached to the laser scanning, the laser ranging from the laser scanning, the laser head, the laser ranging from the laser head, the laser head is capable of ranging from the laser head, the laser ranging from the laser head, the laser ranging from the ranging.
The method for synchronously measuring the surface tension and the liquid-solid contact angle of the liquid by temperature control of the embodiment comprises the following steps:
1. manufacturing a solid hanging piece 1 to be measured with the size of 10mm multiplied by 2mm multiplied by 20mm, perforating 2 round holes with the diameter of 1.5mm at the position of 4mm on the top surface of the solid hanging piece, wherein the distance between the round holes is 3mm, and the thin piece is required to be prevented from being crushed, otherwise, manufacturing the solid hanging piece again, penetrating a thin wire 3, hanging the solid hanging piece on an electronic digital display dynamometer (the numerical value of the dynamometer is set to zero before hanging, and the electronic digital display dynamometer can adopt an Aipu brand NK/SF type digital display push-pull dynamometer), ensuring that the lower part of the thin wire 3 is triangular when the thin wire 3 is hung, and the bottom surface and the side surface of the solid hanging piece 1 to be measured;
2. opening a liquid inlet hole in the top of the water bath tank 16, adding water to the bottom of a groove where the laser radar ranging scanner 8 is located, adding the liquid 4 to be measured to a mark position 100mm away from the bottom surface of the inner side in the liquid containing tank 14, and when the liquid 4 to be measured is added to be close to the mark, applying a rubber head dropper to perform titration;
3. debugging the running state of a motor 5 (a direct current micro low-speed forward and reverse rotation speed-adjustable motor of Zhengke brand ZGB37RG model) and the working state of a motor controller 6 to ensure the accurate control of a button of the motor controller 6, if the motor controller runs well, suspending the bottom surface of a solid suspension piece 1 to be tested at a position 2mm away from the liquid level 4 of liquid to be tested, and enabling the motor 5 to be in a power-on state, otherwise, checking is needed to solve the existing problems, ensure the requirements to be met, and then testing;
4. debugging the working conditions of a computer 7 and laser radar ranging scanners 8 (a Silan brand LIDAR laser A1 type radar 360-degree scanning ranging ROS robot slam with a control drawing function) at two sides of a solid hanging piece 1 to be tested, drawing the same ranging curve when the same ranging curve is drawn, proving that the ranging curve runs well, otherwise, finding out the reason, solving the problem until the requirement is met, and enabling the two to be in a power-on state to be tested and controlled;
5. debugging a heater 12, a temperature controller 11 (Keyu brand KEYU-QIAN model temperature control type 304 stainless steel heating rod) and an alternating current power supply 10 to ensure that the heater 12 can work normally, the temperature controller 11 can well set the temperature, automatically starting a heating or heat preservation system, the alternating current power supply 10 adopts 220V alternating current and is provided with a switch for controlling the electrifying condition, otherwise finding out the reason, solving the problem until the requirement is met, then setting the test temperature, and starting the heater 12 to heat;
6. measuring the temperature of liquid 4 to be measured by an infrared temperature measuring gun (Hima brand AS model infrared hand-held temperature measuring gun), starting a motor 5 after the temperature reaches a standard temperature, descending a solid hanging piece 1 to be measured, starting a laser radar ranging scanner 8 for scanning when the liquid level of the liquid 4 to be measured reaches 3 marking lines of the solid hanging piece 1 to be measured, drawing a soaking curve on a computer, reading and recording the reading of an electronic digital display dynamometer 2, pressing a reversing button of a motor controller 6 after the 3 marking lines are measured, and stopping measuring again when quitting, closing a power supply of the motor and stopping heating;
7. the immersion curves drawn by the two laser radar range scanners 8 are subjected to nonlinear fitting to obtain a fitting equation y ═ f (x), times of derivatives y ═ f '(x) are obtained, y' when x is 0 is calculated to obtain y ═ f '(0) ═ tan theta, if the f' (0) errors obtained by the two laser radar range scanners are within 1% and the f '(0) parameter errors mapped when marking lines at 3 are within 0.1%, the average value of the f' (0) is taken as the final liquid-solid contact angle theta, otherwise, the reason is searched and solved, and re-measurement is carried out, for example, when times of measurement and fitting are carried out, the following equation is obtained:
y＝-2.963x3+41.758x2-193.7x+301.25
then times the derivative can be taken,
y′＝-2.963x3+41.758x2-193.7
when x is 0, y' is-193.7 arctan θ, the liquid-solid contact angle θ is 89.7 °;
8. when the surface tension of the liquid is tested, firstly reading the gravity value of the hanging piece, recording the gravity value as G, and secondly reading the tension values of the electronic digital dynamometer, namely F, when the distance from the surface of the liquid to the bottom surface of the hanging piece is 1mm, 3mm and 5mm respectively1、F2、F3The corresponding immersion areas are respectively A1、A2、A3. The tensile force value F is the buoyancy F borne by the liquid surface tension gamma, the immersion area A and the hanging piecefJointly, it is decided that:
F＝G+γ*A-Ff
different liquids to be measured have different densities rho, and for the same liquids, the hanging pieces with different immersion depths have different immersion volumes, corresponding to V1、V2、V3According to the following formula
Ff＝ρgV
It can be seen that the corresponding buoyancy force received is Ff1、Ff2、Ff3Then, the calculated corresponding surface tension values when the distance between the liquid surface and the bottom surface of the hanging piece is 1mm, 3mm and 5mm respectively are as follows:
Figure BDA0002285253730000122
due to gamma1、γ2、γ3All are surface tension values of the liquid, the surface tension of the liquid should be the average of the three, namely:
the invention has the following advantages:
1. the temperature at the time of measurement can be controlled. The surface tension of the liquid is different at different temperatures, the contact angle between the liquid and the solid is influenced, and the measurement of the surface tension and the contact angle at different temperatures can be controlled, so that the engineering significance and the practical significance are realized;
2. the surface tension of the liquid and the liquid-solid indirect antenna can be synchronously tested. At present, few instruments can synchronously test the surface tension and the contact angle, and a small part of instruments which can synchronously test the surface tension and the contact angle are expensive;
3. the device is designed by a hanging piece method with various advantages. The hanging piece method has the advantages of simple principle, simple and convenient operation, controllable temperature, suitability for various solutions, convenience for calculating surface tension gamma, low requirement on external conditions and the like, most of the conventional testing instruments rely on a liquid drop shape method, and the number of the instruments relying on the hanging piece method is small;
4. the application range is , the surface tension of various liquids can be accurately measured, such as emulsified asphalt, color paint, ink and other liquids, the contact angles between various liquids and various solids can be accurately measured, and the types of the solids can be measured, such as rock, metal, rubber and other substances;
5. the measurement precision is higher. The electronic digital dynamometer should have the displayed tension value precision of at least 0.01N, the calculated surface tension precision of 0.01N/m, the ranging resolution of a laser radar ranging scanner within 0.5mm, and the calculated contact angle error of 0.1 degree.
6. The measuring stability is high, the repeatability is good, the measuring speed is high, the principle and the structure are simple, the grasping is easy, the cost is low, and the manufacturing cost can be basically controlled within 2000 yuan.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims (10)

  1. The device for synchronously measuring the liquid surface tension and the liquid-fixed antenna by using the temperature control is characterized by comprising a water bath box (16), a liquid containing box (14) to be measured, a laser radar ranging scanner (8), a driving mechanism, a dynamometer (2) and a solid hanging piece (1) to be measured, wherein the liquid containing box (14) to be measured is of a box structure with an open top, the lower part of the liquid containing box (14) to be measured is arranged in the water bath box (16), the dynamometer (2) is hung at the output end of the driving mechanism, the output end of the driving mechanism can drive the dynamometer (2) to move up and down, the solid hanging piece (1) to be measured is hung at the lower end of the dynamometer (2), the solid hanging piece (1) to be measured is located above the liquid containing box (14) to be measured, the laser radar ranging scanner (8) is arranged on the side of the solid hanging piece (1) to be measured, the laser output end of the laser radar ranging scanner (8) is flush with the surface of the liquid (4) to be measured in the liquid containing box (14) to be measured, and the laser radar ranging scanner (8) can be measured when the solid hanging piece.
  2. 2. The temperature-controlled device for synchronously measuring liquid surface tension and liquid-solid antenna according to claim 1, wherein the water bath (16) is transparent, the top surface of the water bath (16) is provided with an opening (16-1), the inner edge of the opening (16-1) is provided with an extension section (16-2) downwards, the upper end of the liquid containing box (14) to be measured is hermetically connected with the lower end of the extension section (16-2), the water bath (16) is provided with a groove (16-3) downwards from the top at the side of the extension section (16-2), the laser radar range finder (8) is arranged in the groove (16-3), and the laser emitting end of the laser radar range finder (8) is perpendicular to the extension section (16-2).
  3. 3. The temperature-controlled device for synchronously measuring liquid surface tension and liquid-solid antenna according to claim 1, wherein the shape of the solid suspension piece (1) to be measured is cuboid, two through holes are symmetrically formed in the upper end of the solid suspension piece (1) to be measured, the solid suspension piece (1) to be measured is suspended at the lower end of the dynamometer (2) through the two through holes and the thin wire (3), the bottom surface of the solid suspension piece (1) to be measured is horizontal, and a plurality of horizontal marking lines are arranged at the lower end of the solid suspension piece (1) to be measured from top to bottom.
  4. 4. The device for synchronously measuring the surface tension of a liquid and the liquid-solid antenna by controlling the temperature according to claim 1, wherein the water bath tank (16) has a water outlet at the bottom and a water inlet at the top, and the water bath tank (16) is further provided with a temperature control system for controlling the temperature of the liquid in the water bath tank (16).
  5. 5. The device for synchronously measuring surface tension of liquid and liquid-solid antenna with temperature control according to claim 4, wherein the temperature control system comprises a heater (12), a temperature sensor and a temperature controller (11), the heater (12) and the temperature sensor are arranged in the water bath tank (16) and are respectively used for heating the liquid in the water bath tank (16) and measuring the temperature of the liquid in the water bath tank (16), and the heater (12) and the temperature sensor are both connected with the temperature controller (11).
  6. 6. The device for synchronously measuring the surface tension of liquid and the liquid-solid antenna by temperature control according to claim 1, wherein the driving mechanism comprises a motor (5) capable of rotating forward and backward, a motor controller (6) is connected to the motor (5), and the dynamometer (2) is connected with an output shaft of the motor (5) through a thin wire.
  7. 7. The device for synchronously measuring the surface tension of liquid and the liquid-solid antenna by temperature control according to claim 1, wherein two lidar ranging scanners (8) are provided, and the two lidar ranging scanners (8) are symmetrically arranged around the solid suspension piece (1) to be measured.
  8. 8. The apparatus for synchronously measuring liquid surface tension and liquid-solid antenna with temperature control according to claim 1, further comprising a computer (7), wherein the computer (7) is connected to a lidar ranging scanner (8).
  9. 9. The apparatus for synchronously measuring liquid surface tension and liquid-solid contact angle with temperature control as claimed in claim 1, wherein the dynamometer (2) is an electronic digital display dynamometer.
  10. 10, method for simultaneous temperature-controlled measurement of liquid surface tension and liquid-solid contact angle, characterized by the fact that it is performed by the device for simultaneous temperature-controlled measurement of liquid surface tension and liquid-solid contact angle according to any of claims 1-9, comprising the following steps:
    the liquid (4) to be measured in the liquid containing box (14) to be measured reaches a preset temperature;
    measuring the weight of the solid hanging piece (1) to be measured;
    descending the to-be-measured solid hanging piece (1) and immersing the to-be-measured solid hanging piece into the to-be-measured liquid (4), scanning the contact part of the to-be-measured solid hanging piece (1) and the to-be-measured liquid (4) by using a laser radar ranging scanner (8) in the contact process of the to-be-measured solid hanging piece (1) and the to-be-measured liquid (4), and simultaneously recording the measured value of the dynamometer (2); obtaining a soaking curve according to a scanning result by a laser radar ranging scanner (8);
    and obtaining a contact angle between the liquid to be detected and the solid hanging piece (1) to be detected by using the infiltration curve, and obtaining the surface tension of the liquid to be detected by using the measured value of the dynamometer (2) and the weight and the size of the solid hanging piece (1) to be detected.
CN201911157704.9A 2019-11-22 2019-11-22 temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna Pending CN110736685A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911157704.9A CN110736685A (en) 2019-11-22 2019-11-22 temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911157704.9A CN110736685A (en) 2019-11-22 2019-11-22 temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna

Publications (1)

Publication Number Publication Date
CN110736685A true CN110736685A (en) 2020-01-31

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CN201911157704.9A Pending CN110736685A (en) 2019-11-22 2019-11-22 temperature-control device and method for synchronously measuring liquid surface tension and liquid-solid antenna

Country Status (1)

Country Link
CN (1) CN110736685A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112881236A (en) * 2021-01-14 2021-06-01 青岛理工大学 Liquid-liquid extraction interface shear rheology research device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112881236A (en) * 2021-01-14 2021-06-01 青岛理工大学 Liquid-liquid extraction interface shear rheology research device
CN112881236B (en) * 2021-01-14 2022-03-01 青岛理工大学 Liquid-liquid extraction interface shear rheology research device

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