CN111006971A - Test device and method for researching contact collision behavior of liquid drops and mine dust surface - Google Patents
Test device and method for researching contact collision behavior of liquid drops and mine dust surface Download PDFInfo
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- CN111006971A CN111006971A CN201911361503.0A CN201911361503A CN111006971A CN 111006971 A CN111006971 A CN 111006971A CN 201911361503 A CN201911361503 A CN 201911361503A CN 111006971 A CN111006971 A CN 111006971A
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- mine dust
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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
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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
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8411—Application to online plant, process monitoring
Abstract
A test device and a method for researching contact collision behavior of liquid drops and the surface of mine dust comprise a horizontal base which is horizontally arranged, wherein a level gauge is installed on the horizontal base, a mine dust placing surface is arranged in the middle of the horizontal base, an observation area is arranged on the mine dust placing surface, a micro injection device is fixed right above the observation area, a liquid outlet of the micro injection device faces the observation area of the mine dust placing surface, an LED light source is arranged on one side of the mine dust placing surface, a first high-speed camera and a second high-speed camera are arranged on the other side of the mine dust placing surface, and target points of the first high-speed camera and the second high-speed camera are the observation area of the mine dust placing surface.
Description
Technical Field
The invention belongs to the field of research on wet dust removal technology of mines, and particularly relates to a test device and a method for researching contact collision behavior of liquid drops and mine dust surfaces.
Background
The dust pollution problem exists in the operation links such as rock drilling, blasting, shipping and the like in the mining process of the mine, and the dust pollution not only pollutes the environment, but also directly threatens the safe production of the mine, seriously influences the occupational health of miners, accelerates the damage of mechanical equipment and causes serious environmental problems.
The wet dust removal technology is the most widely applied dust removal method in the mine production field, and how to effectively improve the efficiency of the wet dust removal technology, especially the efficiency of the wet dust removal technology for removing micron-sized (PM2.5 and PM10) dust is a research hotspot in the field of current dust control, but few researches are made on the dust removal behaviors and action mechanisms between wet dust removal water mist and micron-sized dust, and related test and research methods and test devices are mainly lacked at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a test device and a method for researching the contact collision behavior of liquid drops and the surface of mine dust, wherein the test device has a simple structure, is easy to operate, and can better observe the contact of the liquid drops and the surface of the mine dust and the spreading and permeating behavior of the liquid drops on the surface of the mine dust.
The purpose of the invention is realized by adopting the following technical scheme:
a test device for researching contact collision behavior of liquid drops and mine dust surfaces comprises a horizontal base which is horizontally arranged, wherein a level gauge is installed on the horizontal base, a mine dust placing surface is arranged in the middle of the horizontal base, an observation area is arranged on the mine dust placing surface, a micro injection device is fixed right above the observation area, a liquid outlet of the micro injection device faces the observation area of the mine dust placing surface, an LED light source is arranged on one side of the mine dust placing surface, a first high-speed camera and a second high-speed camera are arranged on the other side of the mine dust placing surface, target points of the first high-speed camera and the second high-speed camera are the observation areas of the mine dust placing surface, a working end of the first high-speed camera and the target points are located on the same horizontal plane, and an included angle formed by a connecting line of the working end of the second high-speed camera and the target points and the horizontal.
Furthermore, install first spiral elevating platform on the horizontal base, the mine dust is placed the face and is set up on the top lift platform of first spiral elevating platform.
Further, the first high-speed camera and the second high-speed camera are respectively installed on the lifting platform of the second spiral lifting platform and the lifting platform of the third spiral lifting platform.
Further, the micro-injection device comprises a micro-injection pump and a micro-sample injector arranged in the micro-injection pump, the micro-injection pump is connected with a horizontal bracket through a fixing plate, and the horizontal bracket is fixed on a horizontal base through a vertical bracket.
Further, the micro syringe pump is electrically connected to a control device, and the first high speed camera 15 and the second high speed camera 18 are electrically connected to a computer.
Furthermore, a smooth hydrophobic material layer is arranged on the surface of the mine dust placing surface.
Further, the distance between the liquid outlet of the micro-injection device and the mine dust placing surface is 0.5 cm.
The method for researching the contact collision behavior of the liquid drops and the mine dust surface by using the test device comprises the following steps:
a: putting the mine dust to be tested into a drying oven for drying, setting the temperature at 50 ℃, setting the drying time at 30min, and taking out for later use after drying is finished;
b: laying the mine dust on a mine dust placing surface, compacting the mine dust, measuring the surface thickness of the mine dust, and ensuring that the thickness of the mine dust is 2-4 mm;
c: connecting the first and second high-speed cameras with a computer, turning on an LED light source, adjusting the shooting angles of the first and second high-speed cameras, setting target points of the first and second high-speed cameras in an observation area of a mine dust placing surface, and setting parameters of the first and second high-speed cameras, wherein the time interval of picture shooting is 500 mus, and the resolution is 512 x 512;
d: setting parameters of a micro-injection device, wherein the liquid absorption amount of the micro-injection device is 10 mu l when the micro-injection device absorbs liquid, the liquid discharge amount is 7 mu l when the micro-injection device discharges liquid, and the liquid discharge speed is 1.18 mu l/s;
e: at the moment when the liquid drop is about to fall, shooting is started, and after shooting is finished, the shot picture is stored and analyzed.
Furthermore, the total number of the pictures taken by the first high-speed camera is 10000, and the total number of the pictures taken by the second high-speed camera is 25000.
By adopting the structure, the device shoots the contact process by using the high-speed camera, screens out a series of pictures of liquid drops from the beginning of contacting with the surface of the mine dust to the complete disappearance of the liquid drops on the surface of the mine dust, divides the liquid drop behaviors into two stages of motion bounce and spreading and permeating, and counts the behaviors of the liquid drops on the surfaces of the mine dust with different particle diameters; measuring the bounce height of the liquid drop when bouncing, the spreading radius and the spreading area of the liquid drop on the surface of mine dust by using image analysis software, and researching the change condition of the liquid drop; and (4) counting the penetration time of the liquid drops on the surface of the mine dust under different conditions according to the time interval and the number of the photos, and further researching the contact behavior and the rule of the liquid drops and the penetration behavior and the rule of the liquid drops on the surface of the mine dust. According to the research result, corresponding measures are taken to avoid actions (such as liquid drop bounce) which are not beneficial to dust removal; and comparing the penetration effects of the liquid drops under different conditions to select the property of the liquid drops when the optimal penetration effect is achieved. Has certain guiding significance for selecting proper chemical surface active agent and improving the dust removal efficiency.
In conclusion, the device has a simple structure, is easy to operate, and can relatively well observe the contact between the liquid drop and the surface of the mine dust and the spreading and permeating behavior of the liquid drop on the surface of the mine dust.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a top view of the horizontal base of the present invention.
In the figure: 1-horizontal base, 2-level knob, 3-level, 4-first spiral lifting platform, 5-mine dust placing surface, 6-vertical support, 7-horizontal support, 8-fixing plate, 9-micro injection pump, 10-micro sample injector, 11-objective table, 12-LED light source, 13-second spiral lifting platform, 14-triangular support, 15-first high-speed camera, 16-control device, 17-third spiral lifting platform, 18-second high-speed camera, 19-computer and 20-electronic balance.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1 and 2, the test device for studying the contact collision behavior of liquid drops and mineral dust surfaces comprises an electronic balance 20, a horizontal base 1, a first spiral lifting platform 4, a movable spiral lifting platform 13, a movable spiral lifting platform 17, a mineral dust placing surface 5, a vertical support 6, a horizontal support 7, a fixing plate 8, a microsyringe 9, a microinjection pump 10, a microinjection pump control device 16, a first high-speed camera 15, a second high-speed camera 18 and an LED light source 12.
The electronic balance 20 is a separate unit for weighing the desired mass of mine dust.
The level 3 is installed on horizontal base 1, and vertical support 6 is fixed in on the horizontal base 1, and horizontal stand 7 links to each other with 6 tops of vertical support, and fixed plate 8 is installed to 7 tip of horizontal stand, installs the microinjection pump on the fixed plate 8.
The mine dust placing surface 5 is arranged on the first spiral lifting platform 4, the first spiral lifting platform 4 is installed on the horizontal base 1, and the first spiral lifting platform 4 adjusts the height of the mine dust placing surface 5 through rotating a lifting knob.
The microsyringe 10 is mounted in a micro syringe pump 9 and the whole is placed in the fixed plate 8, the micro syringe pump 9 is connected to its control means 16, and the first high-speed camera 15 and the second high-speed camera 18 are connected to a computer.
An LED light source 12 is arranged on one side of the mine dust placing surface 5, a first high-speed camera 15 and a second high-speed camera 18 are arranged on the other side of the mine dust placing surface, target points of the first high-speed camera 15 and the second high-speed camera 18 are observation areas of the mine dust placing surface 5, a working end of the first high-speed camera 15 and the target points are located on the same horizontal plane, an included angle between a connecting line of the working end of the second high-speed camera and the target points and the horizontal plane is 45-90 degrees, and 90 degrees are optimal.
The first high-speed camera 15 is used for shooting the contact action of the liquid drops and the mine dust surface, and the second high-speed camera 18 is used for shooting the spreading and penetration action of the liquid drops on the mine dust surface.
The first and second high-speed cameras are Taiwan Hengxin AZ90000 high-speed cameras, and the Image analysis software in the computer comprises Image J Image processing software and a T3000 microscopic Image processing system.
To the analysis of different particle size mine dusts, sieve the mine dust in advance, the quality that different particle size mine dusts weighed is the same, should be roughly the same at the area of placing the surface and placing to reach better contrast effect.
The initial height of the liquid drops is analyzed by changing the height of the lifting platform by rotating an adjusting knob of the fixed lifting platform 4 so as to change the initial distance between the liquid drops and the surface of the mine dust.
The analysis of the initial kinetic energy of the liquid drops is realized by setting parameters of the micro-injection pump 9, changing the liquid discharge amount, controlling the size of the liquid drops and changing the liquid discharge speed to control the initial kinetic energy of the liquid drops.
The energy analysis was performed by the following formula:
Ek0+Eh+Es＝Ew+Er
in the formula: ek0The kinetic energy of the droplet at the initial time (initial velocity of the droplet can be calculated from two adjacent photographs at the moment of falling of the droplet, and thus initial kinetic energy) EhInitial potential energy (Eh-mgh) possessed by the droplet, EsIs the surface energy of the droplet, EwEnergy lost during contact of the droplets with the dust surface, ErIs the energy remaining after the droplets collide with the surface of the mine dust.
A method for researching the contact collision behavior of liquid drops and the surface of mine dust adopts the test device, and comprises the following steps:
step 1: putting the required mine dust into a drying oven for drying, setting the temperature at 50 ℃, setting the drying time at 30min, and taking out for later use after drying is finished;
step 2: weighing a proper amount of mineral dust by using an electronic balance 20 (the proper amount of mineral dust satisfies the following conditions that the surface diameter of a mineral dust placing surface 5 is 4-6cm, the thickness of the mineral dust on the mineral dust placing surface 5 is 2-4mm, and 3mm is optimal), compacting the surface three times by using a glass slide, measuring the surface thickness of the mineral dust by using a vernier caliper to ensure that the surface thickness meets the thickness requirement, and placing the mineral dust placing surface 5 on a first spiral lifting platform 4, wherein the surface of the mineral dust placing surface is smooth and is made of hydrophobic material;
and step 3: respectively placing a first high-speed camera and a second high-speed camera on a first movable spiral lifting platform and a second movable spiral lifting platform, connecting the first high-speed camera and the second high-speed camera with a computer, turning on an LED light source 12, adjusting the shooting angles of the first high-speed camera and the second high-speed camera, arranging target points of the first high-speed camera and the second high-speed camera in an observation area of a mine dust placing surface 5, enabling a clear picture of the observation area to be observed in the computer, setting camera parameters, wherein the time interval of the pictures is 500 microseconds, the resolution is 512 microseconds and 512 microseconds, the total number of pictures shot by the first high-speed camera 15 is 10000, the total number of pictures shot by the second high-speed camera 18 is 25000, the first high-speed camera 15 shoots a solid-liquid contact interface, and the second high-speed camera 18 shoots the spreading and penetration behaviors of liquid drops on the surface of the mine dust;
and 4, step 4: setting parameters of a micro-injection pump 9, wherein the liquid absorption amount during liquid absorption is 10 mu l, the liquid discharge amount during liquid discharge is 7 mu l, the liquid discharge speed is 1.18 mu l/s, after the liquid absorption of the micro-sampler 10 is finished, installing the micro-injection pump 9 on a fixed plate 8, and operating the injection pump to discharge liquid;
and 5: rotating a knob of the fixed lifting platform 4, and adjusting the distance between the mine dust placing surface 5 and the liquid outlet of the micro sample injector to be 0.5 cm;
step 6: at the moment when the liquid drops are about to fall, clicking to capture, starting to shoot, and storing the shot pictures after shooting is finished;
while the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a research liquid drop and test device of mine dust surface contact collision action which characterized in that: the mine dust collecting device comprises a horizontal base which is horizontally arranged, a level gauge is installed on the horizontal base, a mine dust placing surface is arranged in the middle of the horizontal base, an observation area is arranged on the mine dust placing surface, a micro injection device is fixed right above the observation area, a liquid outlet of the micro injection device faces the observation area of the mine dust placing surface, an LED light source is arranged on one side of the mine dust placing surface, a first high-speed camera and a second high-speed camera are arranged on the other side of the mine dust placing surface, target points of the first high-speed camera and the second high-speed camera are observation areas of the mine dust placing surface, the working end of the first high-speed camera and the target points are located on the same horizontal plane, and an included angle formed by a connecting line of the working end of the second high-speed camera and the target points.
2. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the mine dust placing surface is arranged on a top lifting platform of the first spiral lifting platform.
3. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the first high-speed camera and the second high-speed camera are respectively arranged on the lifting platforms of the second spiral lifting platform and the third spiral lifting platform.
4. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the micro-injection device comprises a micro-injection pump and a micro-sample injector arranged in the micro-injection pump, the micro-injection pump is connected with a horizontal bracket through a fixing plate, and the horizontal bracket is fixed on a horizontal base through a vertical bracket.
5. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the micro syringe pump is electrically connected to a control device, and the first high speed camera 15 and the second high speed camera 18 are electrically connected to a computer.
6. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the surface of the mine dust placing surface is provided with a smooth hydrophobic material layer.
7. The test device for researching the contact collision behavior of the liquid drop and the mine dust surface according to claim 1, is characterized in that: the distance between the liquid outlet of the micro-injection device and the mine dust placing surface is 0.5 cm.
8. A method for studying the contact collision behavior of liquid droplets with a mine dust surface by using the test device of any one of claims 1 to 7, characterized in that: the method comprises the following steps:
a: putting the mine dust to be tested into a drying oven for drying, setting the temperature at 50 ℃, setting the drying time at 30min, and taking out for later use after drying is finished;
b: laying the mine dust on a mine dust placing surface, compacting the mine dust, measuring the surface thickness of the mine dust, and ensuring that the thickness of the mine dust is 2-4 mm;
c: connecting the first and second high-speed cameras with a computer, turning on an LED light source, adjusting the shooting angles of the first and second high-speed cameras, setting target points of the first and second high-speed cameras in an observation area of a mine dust placing surface, and setting parameters of the first and second high-speed cameras, wherein the time interval of picture shooting is 500 mus, and the resolution is 512 x 512;
d: setting parameters of a micro-injection device, wherein the liquid absorption amount of the micro-injection device is 10 mu l when the micro-injection device absorbs liquid, the liquid discharge amount is 7 mu l when the micro-injection device discharges liquid, and the liquid discharge speed is 1.18 mu l/s;
e: at the moment when the liquid drop is about to fall, shooting is started, and after shooting is finished, the shot picture is stored and analyzed.
9. The method for researching the contact collision behavior of the liquid drops and the mine dust surface according to claim 8, is characterized in that: the total number of photos taken by the first high-speed camera is 10000, and the total number of photos taken by the second high-speed camera is 25000.
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| CN201911361503.0A CN111006971A (en) | 2019-12-26 | 2019-12-26 | Test device and method for researching contact collision behavior of liquid drops and mine dust surface |
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| CN201911361503.0A CN111006971A (en) | 2019-12-26 | 2019-12-26 | Test device and method for researching contact collision behavior of liquid drops and mine dust surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903538A (en) * | 2021-02-09 | 2021-06-04 | 太原理工大学 | Full-automatic coal dust wettability experiment testing arrangement |
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