CN113109215A - Spray droplet particle size detection device and detection method - Google Patents
Spray droplet particle size detection device and detection method Download PDFInfo
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- CN113109215A CN113109215A CN202110270065.8A CN202110270065A CN113109215A CN 113109215 A CN113109215 A CN 113109215A CN 202110270065 A CN202110270065 A CN 202110270065A CN 113109215 A CN113109215 A CN 113109215A
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- 239000002245 particle Substances 0.000 title claims abstract description 79
- 239000007921 spray Substances 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 claims abstract description 142
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000007599 discharging Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 28
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- 238000005096 rolling process Methods 0.000 claims description 15
- 238000003709 image segmentation Methods 0.000 claims description 10
- 238000012937 correction Methods 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 6
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- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
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- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
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- 238000001816 cooling Methods 0.000 description 5
- 238000004659 sterilization and disinfection Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
- G01N15/0227—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging using imaging, e.g. a projected image of suspension; using holography
Abstract
The invention discloses a spray droplet particle size detection device which comprises a droplet particle size image acquisition instrument, a control module and an image processing module, wherein the control module controls the droplet particle size image acquisition instrument to acquire a droplet image, the image processing module processes and analyzes the acquired droplet image to obtain the droplet particle size, the droplet particle size image acquisition instrument comprises a shell, and water-sensitive test paper, a paper feeding device, a paper discharging device, a water-sensitive test paper placing device and a test paper image acquisition device which are arranged in the shell, wherein the water-sensitive test paper placing device comprises a turntable for driving a plurality of water-sensitive test paper to rotate to acquire spray droplets, and then the spray droplet image is acquired. The device is simple in operation, low in processing cost, high in detection speed and high in precision, a plurality of water-sensitive test paper are rotated through the rotary table to collect the spray droplet images at the same position, so that real-time multiple measurement is realized, and the detection and analysis result is more reliable. Meanwhile, the automatic continuous collection of the spray droplets can be realized. The method for detecting the droplet particle size by adopting the image processing method is simple to operate and quick to process.
Description
Technical Field
The invention relates to a detection instrument device, in particular to a device and a method for detecting the particle size of spray droplets.
Background
The spraying is widely applied to spraying disinfection, airborne spray cooling, dust suppression cooling and humidification of urban streets, pesticide liquid spraying of agriculture, forestry and animal husbandry and the like. The atomization is a complex nonlinear process with multiple changing ends, the atomization process is reasonably simplified in the research of the atomization process, the atomization is that liquid flows into an atomization nozzle and then is sprayed out from a spray hole to the air, and the liquid in the air is broken and crushed continuously until fog drops reach an atomization state, and the atomization process can be roughly divided into five processes of liquid film formation, liquid film breakage, large-particle fog flow formation, liquid drop formation and fog drop formation. The fog drops can be divided into aerosol drops, mist drops, fine fog drops, medium fog drops and coarse fog drops according to the size of the fog drops, the expression method of the particle size is generally divided into average particle size and single particle size, and the single particle size is divided into diameter, projection diameter, geometric equivalent diameter and physical equivalent diameter.
The particle size of the formed droplets in the actual application of spraying is an important parameter index for evaluating the spraying quality and characteristics of the spraying device, the atomizing performance of the spraying device can be judged by accurately detecting the particle size of the sprayed droplets of the spraying device, and the particle size of the droplets can directly or indirectly influence the performance indexes such as the drift property, the density characteristic, the spraying cone angle, the sterilization and disinfection effect, the heat exchange cooling effect, the sedimentation effect, the covering effect and the like of the spraying device and the droplets. The particle size of the droplets also directly influences the size distribution characteristics of the droplets in the spraying device, if the particle size of the droplets is smaller, the number of the droplets is larger under a certain liquid spraying amount and pressure, the coverage rate of the droplets on the surface of a spraying object is larger, the droplets are distributed more uniformly, and the spraying device has good droplet size distribution characteristics and sterilization, disinfection and heat exchange cooling effects. The size of the droplet particle size can directly influence the sedimentation and covering effect of the droplets of the spraying device, generally, the smaller the droplet particle size is, the better the sedimentation and covering effect of the droplets is, but if the droplet particle size is smaller than 20 μm, the droplets are difficult to deposit on the surface of an object, and the sedimentation and covering effect is also poor. The particle size of the fog drops also directly influences the drift of the fog drops, and generally, the smaller the particle size of the fog drops, the more easily the fog drops drift, and the better the drift performance of the fog drops
The particle size of the fog drops of the spraying device is detected, the atomization performance of the spraying device can be evaluated according to the particle size of the fog drops, and the disinfection effect and the spray cooling heat exchange performance of the liquid medicine can be judged to a certain extent, so that the particle size of the fog drops is necessary to be detected and researched.
At present, the particle size detection method mainly comprises an artificial measurement method, a laser particle sizer method and an image processing method. The manual measurement method has low efficiency of detecting the particle size of the spray droplets, and is easy to cause fatigue of measuring personnel when detecting a large amount of the spray droplets, and the measuring personnel has strong subjectivity and is easy to generate measurement errors; the laser particle analyzer is used for detecting the particle size of the fog drops, although the detection precision is high and the measurement is stable and reliable, the detection cost is high due to the fact that the laser particle analyzer is expensive; the image processing method has the advantages of simple operation, fast processing, programmability and the like, and is widely adopted, and at present, the image processing method for detecting the droplet particle size is more, but the adopted image processing method is different, so the detection accuracy is also different.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above disadvantages, the present invention provides a device and a method for detecting the droplet size of a spray device, which are capable of accurately detecting the droplet size of the spray device, and have the advantages of simple operation, low cost and high speed.
The technical scheme is as follows: in order to solve the problems, the invention adopts a spray droplet particle size detection device, which comprises a droplet particle size image acquisition instrument, a control module and an image processing module, wherein the control module controls the droplet particle size image acquisition instrument to acquire a droplet image, the image processing module processes and analyzes the acquired droplet image to obtain the droplet particle size, and the droplet particle size image acquisition instrument comprises a shell, and a water-sensitive test paper, a paper feeding device, a paper discharging device, a water-sensitive test paper placing device and a test paper image acquisition device which are arranged in the shell;
the housing comprises an upper cover, the upper cover comprises a mist inlet window which is arranged at the top of the upper cover and used for the mist spray to pass through;
the water-sensitive test paper placing device comprises a turntable, a turntable driving motor and a plurality of test paper supports, wherein the test paper supports are uniformly distributed along the circumference of the turntable, the fixed end of the turntable driving motor is fixedly connected with a shell, the turntable driving motor drives the turntable to rotate relative to the shell, the angle formed by one rotation of the turntable driving motor is equal to the angle formed by two adjacent test paper supports and the center of the turntable, and the test paper supports sequentially pass through the position under a fog inlet window along with the rotation of the turntable;
the paper feeding device is used for storing the water-sensitive test paper and sending the water-sensitive test paper to the test paper bracket;
the paper unloading device is used for unloading the water-sensitive test paper on the test paper support;
the test paper image acquisition device is arranged on the inner side of the upper cover, is positioned above the test paper support and is used for acquiring fog drop images of the water-sensitive test paper on the test paper support.
Furthermore, the upper cover further comprises a paper inlet and a paper outlet which are arranged on the side face of the upper cover, the positions of the paper inlet and the paper outlet respectively correspond to the two adjacent test paper supports, the paper feeding device is arranged at the paper inlet, the paper discharging device is arranged at the paper outlet, and the test paper image acquisition device is positioned above the test paper support corresponding to the paper outlet.
Furthermore, the fog inlet window is provided with a window baffle for covering the fog inlet window and a baffle driving device, and the baffle driving device is used for driving the window baffle to shield the fog inlet window or driving the window baffle to move away from the position where the fog inlet window is shielded.
Furthermore, the baffle driving device comprises a baffle bracket fixedly connected with the upper cover, a baffle driving motor fixedly arranged on the baffle bracket, a baffle driving gear set, a first lead screw and a first slide block, wherein the baffle driving motor drives the first lead screw to rotate through driving the baffle driving gear set, the first slide block is in threaded connection with the first lead screw, the first lead screw rotates to drive the first slide block to move along the extending direction of the first lead screw, the window baffle is connected with the first slide block, the plane where the window baffle is located is parallel to the extending direction of the first lead screw, and the first slide block moves to drive the window baffle to move to shield the fog inlet window or move away from the position of the fog inlet window.
Furthermore, the paper feeding device comprises a paper feeding box fixedly connected with the shell, a friction pad, a paper rolling wheel, a paper feeding driving gear set, a paper feeding driving motor and a spring are arranged at one end of the paper feeding box, the paper feeding box is used for storing clean water-sensitive test paper, the friction pad is connected with the paper feeding box through the spring, the paper rolling wheel is arranged above the friction pad, the paper feeding driving motor is fixedly arranged on the side face of the paper feeding box, the paper feeding driving motor drives the paper rolling wheel to rotate through driving the paper feeding driving gear set, and the paper rolling wheel rotates to drive the water-sensitive test paper in the paper feeding box to reach the test paper support through the friction pad.
Further, the paper unloading device comprises a paper unloading box, a paper unloading support fixedly connected with the bottom of the upper cover, a paper unloading driving motor fixedly arranged on the paper unloading support, a paper unloading driving gear set, a second lead screw, a second slide block and a paper unloading push plate, wherein the paper unloading driving motor drives the second lead screw to rotate by driving the paper unloading driving gear set, the second lead screw is in threaded connection with the second slide block, the second lead screw rotates to drive the second slide block to move along the extending direction of the second lead screw, the paper unloading push plate is fixedly connected with the second slide block, the second slide block moves to drive the paper unloading push plate to move, and the paper unloading push plate moves to push the water-sensitive test paper on the test paper support into the paper unloading box.
Furthermore, an infrared emission array belt is arranged at the paper feeding end of the paper unloading box and used for emitting infrared signals, an infrared receiving array belt is arranged on the paper unloading support and used for receiving the infrared signals emitted by the infrared emission array belt, the highest point of the infrared emission array belt is not higher than that of the test paper support, and when the test paper support is located between the infrared emission array belt and the infrared receiving array belt, the infrared signals emitted by the infrared emission array belt are shielded by the test paper support.
A detection method of a spray droplet particle size detection device comprises the following steps:
(1) initializing a system, putting water-sensitive test paper on the test paper supports, and setting a detection period for N weeks;
(2) opening a fog inlet window, rotating the turntable for a circle, collecting fog drops on the water-sensitive test paper, and then closing the fog inlet window;
(3) the test paper image acquisition device acquires the spray droplet image of the water-sensitive test paper on the current corresponding test paper support, and then the water-sensitive test paper is dismounted;
(4) after the water-sensitive test paper is unloaded, the turntable is rotated, when the test paper image acquisition device corresponds to the water-sensitive test paper on the next test paper support, the turntable stops rotating, the test paper support unloading the water-sensitive test paper is fed with paper at the moment, and whether the turntable rotates for a circle is judged:
step (5) is carried out when the turntable rotates for one circle;
if the turntable does not rotate for one circle, performing the step (3);
(5) judging whether the turntable rotates for N circles:
if the rotating disc does not rotate for N circles, the step (2) is carried out;
the detection is finished when the turntable rotates for N circles;
(6) and carrying out image processing on the collected spray droplet image, and calculating the actual particle size of the spray droplets.
Further, the infrared transmitting array band and the infrared receiving array band are powered on to operate after the fog inlet window is closed in the step (2), the turntable is rotated when the infrared receiving array band receives the infrared signal in the step (4), and the turntable stops rotating when the infrared receiving array band does not receive the infrared signal.
Further, the image processing of the acquired spray droplet image in the step (6) comprises droplet image preprocessing and image segmentation; the image preprocessing step comprises image graying, image background removal, perspective transformation, image shearing and image filtering; the image segmentation step comprises maximum information entropy image segmentation processing and removal of abnormal points in the image; the step of calculating the actual particle size of the spray droplets comprises the steps of converting the pixel area of the droplet speckles in the image into the actual area, then obtaining the particle size of the droplet speckles, and finishing the correction of the particle size of the droplets through a correction coefficient to obtain the actual particle size of the droplets.
Has the advantages that: compared with the prior art, the device has the obvious advantages of simple operation, low processing cost, high detection speed and high precision, realizes real-time and multiple measurements on the spray droplet images collected at the same position by rotating the plurality of water-sensitive test paper through the turntable, and has more reliability in detection and analysis results.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus for detecting the particle size of spray droplets according to the present invention;
FIG. 2 is an exploded view of an image collector for the particle size of the droplets in the present invention;
FIG. 3 is a schematic view showing the construction of a damper driving apparatus according to the present invention;
FIG. 4 is a schematic view of the structure of the paper discharging device of the present invention;
FIG. 5 is a schematic view showing the connection between the paper discharging device and the upper cover according to the present invention;
FIG. 6 is an exploded view of the upper cover of the present invention;
FIG. 7 is a schematic view of the structure of the mist inlet window of the present invention;
FIG. 8 is a schematic view of the construction of a window shutter according to the present invention;
FIG. 9 is a schematic view of the structure of the spray shield shell of the present invention;
FIG. 10 is a schematic view of the spray shield housing retaining plate of the present invention;
FIG. 11 is a schematic structural view of a paper discharge box of the present invention;
FIG. 12 is an exploded view of the device for placing a water-sensitive test strip according to the present invention;
FIG. 13 is a schematic view of a paper feeding device according to the present invention;
FIG. 14 is an exploded view of the paper feeding device of the present invention;
FIG. 15 is a schematic structural view of a stent according to the present invention;
FIG. 16 is a block diagram of the control module system hardware circuitry of the present invention;
FIG. 17 is a schematic flow chart of the detection method of the present invention;
FIG. 18 is a schematic view of a droplet image processing flow of the present invention;
FIG. 19 is a schematic view of a droplet image acquired by the present invention;
fig. 20 is a schematic diagram of a process of processing a droplet image, 20(a) a schematic diagram of cutting the droplet image, 20(b) a schematic diagram of graying the droplet image, 20(c) a schematic diagram of dividing the image, and 20(d) a schematic diagram of marking the particle size of the droplet.
Detailed Description
Example one
As shown in fig. 1, the spray droplet particle size detection apparatus according to this embodiment includes a droplet particle size image acquisition instrument 2, a control module and an image processing module 3, where the control module controls a working process of the droplet particle size image acquisition instrument 2 for acquiring a droplet image, the control module includes an infrared remote controller 4, the infrared remote controller 4 performs operations such as suspending, resetting and stopping on the droplet particle size image acquisition instrument 2 in working operation, the image processing module 3 processes and analyzes the acquired droplet image and obtains a droplet particle size through calculation, and the spraying device 1 sprays the mist inlet window 222 of the droplet particle size image acquisition instrument 2 after determining parameters such as spraying air pressure, hydraulic pressure and flow.
As shown in fig. 2, the fogdrop particle size image collector 2 includes a housing, a baffle driving device 21 disposed on the housing, and a water-sensitive test paper, a paper feeding device 25, a paper discharging device 23, a water-sensitive test paper placing device 24, a test paper image collecting device, and a collector support 28 disposed inside the housing.
The shell includes circular upper cover 22, lower cover 29, the shell is used for sheltering from the spraying droplet, prevent that the droplet from dropping on inside device, influence the sample collection, collection appearance support 28 arranges in lower cover 29, as shown in fig. 15, collection appearance support 28 includes upper cover support 281, upper cover ring support 282, bearing cushion block 283, bearing support 284, support post 285, ring support 286, universal wheel 287, carousel drive motor support 288, unload paper box support 289, paper feed support 2810, collection appearance support 28 is whole droplet particle diameter image acquisition appearance 2 each device, the part plays the support fixed action, upper cover 22 and upper cover support 281 fixed connection.
As shown in fig. 6, the upper cover 22 includes a mist inlet window 222 disposed at the top of the upper cover 22, a window baffle 223 for covering the mist inlet window 222, and a mist shielding case fixing plate 226, wherein mist droplets enter the inside of the mist droplet size image capturing device 2 from the mist inlet window 222, and the window baffle 223 moves relative to the mist inlet window 222 and shields the mist droplets from entering the mist inlet window 222 according to the instruction of the control module. As shown in fig. 7, the fog inlet window 222 is fixedly connected with the upper cover 22 through a fog inlet window fixing hole 2222, baffle push-pull grooves 2221 are arranged on two sides of an opening of the fog inlet window 222, two sides of the window baffle 223 move back and forth in the baffle push-pull grooves 2221, as shown in fig. 8, a limiting table 2231 is arranged in the middle of two sides of the window baffle 223, the limiting table 2231 limits a moving track of the window baffle 223 in the baffle push-pull grooves 2221, a baffle connecting shaft 2232 is arranged at one end of the window baffle 223, and the baffle connecting shaft 2232 is connected with the baffle driving device 21.
As shown in fig. 3, the baffle driving device 21 includes a driving upper cover 212, a baffle bracket 214 fixedly connected to the upper cover 22, a baffle driving motor 213 fixedly disposed on the baffle bracket 214, a baffle driving gear set, a first screw rod 218, a first slider 217, and a first fixing rod 219, the baffle driving gear set includes a first baffle driving gear 215 and a second baffle driving gear 216, the first baffle driving gear 215 and the second baffle driving gear 216 are engaged with each other, the baffle driving motor 213 drives the first baffle driving gear 215 to rotate, the first baffle driving gear 215 drives the second baffle driving gear 216 to rotate, one end of the first screw rod 218 is fixedly connected to an axial center of the second baffle driving gear 216, the second baffle driving gear 216 drives the first screw rod 218 to rotate, the first slider 217 is in threaded connection with the first screw rod 218, the first screw rod 218 rotates to drive the first slider 217 to move back and forth along an extending direction of the first screw rod 218, the first fixing rod 219 is parallel to the first screw rod 218, the first sliding block 217 is connected with the hole surface of the first fixing rod 219, the first sliding block 217 moves back and forth along the extending direction of the first fixing rod 219, the first fixing rod 219 is used for limiting the moving track of the first sliding block 217, a hole connected with the baffle connecting shaft 2232 is arranged on the side surface of the first sliding block 217, the moving track corresponding to the hole drives the upper cover 212 to be provided with the sliding slot hole 211, and the baffle connecting shaft 2232 moves back and forth in the sliding slot hole 211. The first slider 217 moves to drive the window blocking plate 223 to move to block the fog inlet window 222 or move away from the position where the fog inlet window 222 is blocked. Thereby carrying out opening and closing and size adjustment on the spray inlet window.
The side of the upper cover 22 is provided with a paper inlet and a paper outlet, a spray shielding shell fixing plate 226 is fixed on the paper inlet and the paper outlet, and a fog inlet window 222 is located at the middle position of the paper inlet and the paper outlet, in this embodiment, the paper inlet is located at the left side of the fog inlet window 222, the paper outlet is located at the right side of the fog inlet window 222, the spray shielding shell fixing plate 226 fixedly connects the spray shielding shell 26 with the upper cover 22, as shown in fig. 10, connecting bosses 2261 are arranged at both sides of the spray shielding shell fixing plate 226, as shown in fig. 9, the spray shielding shell 26 is provided with a connecting groove 261, the connecting groove 261 is in fit connection with the connecting boss 2261, the connecting groove 261 can slide on the connecting boss 2261, a connecting limiting surface 262 is arranged at the end of the connecting groove 261, and the connecting limiting surface 262 limits the sliding range of the connecting groove 261 on the connecting boss.
As shown in fig. 5, the bottom of the upper cover 22 is fixedly connected with a paper discharging device 23, as shown in fig. 4, the paper discharging device 23 includes a paper discharging bracket 231 fixedly connected with the bottom of the upper cover 22, a paper discharging driving motor 2310 fixedly arranged on the paper discharging bracket 231, a paper discharging driving gear set, a second lead screw 237, a second slider 2311, a paper discharging push plate 233 and a paper discharging box 2312 fixed on the acquisition instrument bracket 28; the paper discharging driving gear set comprises a first paper discharging driving gear 239 and a second paper discharging driving gear 238, the first paper discharging driving gear 239 and the second paper discharging driving gear 238 are mutually meshed, the paper discharging driving motor 2310 drives the first paper discharging driving gear 239 to rotate, the first paper discharging driving gear 239 rotates to drive the second paper discharging driving gear 238 to rotate, one end of a second lead screw 237 is fixedly connected with the axis of the second paper discharging driving gear 239, the second paper discharging driving gear 238 rotates to drive a second lead screw 237 to rotate, the second lead screw 237 is in threaded connection with a second slider 2311, the second lead screw 237 rotates to drive the second slider 2311 to move back and forth along the extending direction of the second lead screw 237, a second fixing rod 236 and the second lead screw 237 are arranged in parallel, the second slider 2311 is connected with the hole surface of the second fixing rod 236, the second slider 2311 moves back and forth along the extending direction of the second fixing rod 236, the second fixing rod 231236 is used for limiting the moving track of the second slider 2311, the paper unloading push rod 232 is arranged on one side of the second slide block 2311, which is far away from the paper unloading driving motor 2310, and fixedly connected with the paper unloading push plate 233, the plane of the paper unloading push plate 233 is perpendicular to the extending direction of the second screw rod 237, the second slide block 2311 moves to drive the paper unloading push plate 233 to move, the bottom of the paper unloading push plate 233 is provided with a silica gel sheet 234, the silica gel sheet 234 is used for pushing the water-sensitive test paper, the paper unloading push plate 233 moves to push the water-sensitive test paper on the test paper support 241 to the paper unloading box 2312, the paper unloading box 2312 is positioned in the spraying shielding shell 26 of the paper unloading outlet, and the test paper support 241 is positioned between the paper.
An infrared emission array belt 2313 is arranged on the side face of the paper feeding end of the paper unloading box 2312 and used for emitting infrared signals, an infrared receiving array belt 235 is arranged on the position, corresponding to the infrared emission array belt 2313, of the paper unloading support 231 and used for receiving the infrared signals emitted by the infrared emission array belt 2313, the highest point of the infrared emission array belt 2313 is not higher than that of the test paper support 241, and when the test paper support is located between the infrared emission array belt 2313 and the infrared receiving array belt 235, the infrared signals emitted by the infrared emission array belt 2313 are shielded by the test paper support 241.
The water-sensitive test paper placing device 24 is arranged below the upper cover 22, the water-sensitive test paper placing device 24 comprises a circular turntable 242, a turntable driving motor 245 and a plurality of test paper supports 241, the test paper supports 241 are uniformly distributed along the circumference of the turntable, in the embodiment, 6 test paper supports 241 are arranged, the interval angle between the two test paper supports 241 is 60 degrees, the fixed end of the turntable driving motor 245 is fixedly connected with a turntable driving motor support 288 on the acquisition instrument support 28, the output end of the turntable driving motor 245 drives the turntable 242 to rotate relative to the shell through a coupler 244, the coupler 244 is connected with the turntable 242 through a turntable bearing 243, and the test paper supports 241 on the turntable 242 sequentially pass through the position right below the fog inlet window 222 along with the rotation of the turntable 242; in this embodiment, the turntable 242 rotates clockwise, and the test paper holder 241 passes through the paper discharging device 23, the fog inlet window 222, and the paper feeding device 25 in sequence. The turntable 242 is fixedly connected with an outer bearing of the turntable bearing 27, an inner bearing of the turntable bearing 27 is fixedly connected with the bearing support 284 through a bearing cushion block 283, and the turntable 242 rotates relative to the acquisition instrument support 28.
The paper outlet of the paper feeding device 25 corresponds to the paper inlet on the side of the upper cover 22, the paper feeding device 25 puts the water-sensitive test paper on the test paper support 241 through the paper inlet, the paper feeding device 25 is arranged in the spray shielding shell 26, and the spray shielding shell 26 prevents the fog from dropping on the water-sensitive test paper in the paper feeding device 25, thereby protecting the water-sensitive test paper and collecting samples. As shown in fig. 13 and 14, the paper feeding device 25 includes a paper feeding box 2510 fixedly connected to a paper feeding bracket 2810 of the collecting instrument bracket 28, one end of the paper feeding box 2510 is provided with a friction pad 258, a paper rolling wheel, a paper feeding driving gear set, a paper feeding driving motor 257 and a spring 255, the paper feeding box 2510 is used for storing clean water-sensitive test paper, the paper feeding box 2510 is internally provided with a friction pad bracket 259, the friction pad 258 is connected to the friction pad bracket 259 through the spring 255, the paper rolling wheel is arranged above the friction pad 258 and includes a roller 252, a paper rolling shaft 253 for driving the roller 252 to rotate and a rubber ring 251 sleeved outside the roller 252, the paper feeding driving gear set includes a bevel gear 254 and a worm 256, the bevel gear 254 and the worm 256 are engaged with each other, the paper feeding driving motor 257 is fixedly arranged on the side surface of the paper feeding box 2510 through a triangular bracket 2511, the paper feeding driving motor 257, the paper rolling shaft 253 is fixedly connected with the shaft center of the bevel gear 254, the bevel gear 254 rotates to drive the paper rolling shaft 253 to rotate, so that the whole paper rolling wheel is driven to rotate, the paper rolling wheel rotates to drive the water-sensitive test paper in the paper feeding box 2510 to reach the test paper support 241 through the friction pad 258, the friction force between the rubber ring 251 and the water-sensitive test paper is f1, the friction force between the friction pad 258 and the water-sensitive test paper is f2, the friction force between the water-sensitive test paper is f3, and f1, f2 and f3 are arranged, so that due to the action of the friction force, the rubber ring 251 rotates to drive the uppermost water-sensitive test paper to move, and paper feeding is realized through.
The test paper image acquisition device comprises a camera 224 and a light supplement lamp 225 which are arranged on the upper cover 22, wherein the camera 224 and the light supplement lamp 225 are positioned right above the running path of the test paper support 241 and are in the same radius straight line with the paper unloading outlet on the upper cover 22, and are used for shooting the fog drop image of the water-sensitive test paper on the test paper support 241.
As shown in fig. 16, the control module includes a main control module MCU, a wireless module in wireless communication with the upper computer PC and a CH341 serial port module in wired communication, an infrared emission array band module, a relay module for controlling the on/off of the infrared emission array band module circuit, an infrared reception array band module, an AD sampling module for collecting data of the infrared reception array band module, a camera module for collecting fogdrop images, an SD card memory module for storing fogdrop images, an ULN2003 stepping motor driver module, a Tb6560 stepping motor driver module for driving a turntable driving motor to rotate, an LCD display module for displaying the operation condition of the device in real time, a control key module, a buzzer module, an infrared remote control module, and a system power supply module. The device comprises three ULN2003 stepping motor driver modules, a baffle driving motor, a paper feeding driving motor and a paper discharging driving motor, wherein the three ULN2003 stepping motor driver modules respectively drive the baffle driving motor, the paper feeding driving motor and the paper discharging driving motor to rotate; the infrared remote control can control the operation of the droplet particle size collector 2 in real time, such as running, starting, pausing, continuing, stopping, loading and unloading test paper and the like; because there are two kinds of communication modes of wireless and serial ports on host computer MCU and the host computer PC, the user can select according to the demand, and the droplet image photo that the camera was shot can be sent to host computer PC through depositing in the SD card, and two kinds of communication modes of rethread wireless and serial ports carry out data processing, also can directly upload to PC through the data line and carry out data processing.
Example two
A detection method of the spray droplet size detection device in the above embodiment, before detection, parameters such as spray air pressure, hydraulic pressure and flow rate of the spraying device 1 are set, and then spraying is performed, and a detection process is shown in fig. 17, and the detection method includes the following steps:
(1) carrying out system initialization setting on the fogdrop particle size image acquisition instrument 2, wherein water-sensitive test paper is placed on the test paper supports 241 at the beginning, one test paper support 241 is positioned under the camera 224, and a detection period is set for N weeks;
(2) the control module controls the fog inlet window 222 to be opened, a proper opening is opened so that the fog droplets can enter the water-sensitive test paper falling on the test paper support 241, at the moment, the infrared emission array belt 2313 is powered off and stops emitting infrared signals, the infrared receiving array belt 235 cannot receive the infrared signals, therefore, corresponding infrared receiving data does not exist in AD sampling, then the turntable 22 is controlled to rotate clockwise for a circle, the water-sensitive test paper on the six test paper supports 241 sequentially collects the fog droplets, after the turntable 22 rotates for a circle, the test paper support 241 recovers to the initial position, the turntable 22 stops rotating, the fog inlet window is closed, and the fog droplets are prevented from falling on the water-sensitive test paper on the test paper support 241; then the infrared emission array belt 2313 is electrified to work, the infrared emission array belt 2313 emits infrared signals, but at the moment, the test paper support 241 is positioned between the infrared emission array belt 2313 and the infrared receiving array belt 235 to block the infrared signals, the infrared receiving array belt 235 cannot receive the infrared signals, and therefore corresponding infrared receiving data still do not exist in AD sampling;
(3) when infrared receiving data does not exist in AD sampling, the camera 224 and the light supplement lamp 225 work to shoot the current spray droplet image of the water-sensitive test paper on the corresponding test paper support 241, the spray droplet image can be stored according to the initial setting of a user, and the spray droplet image can also be sent to a PC (personal computer) for storage and image processing through two communication modes of a wireless communication mode or a serial port, and then the water-sensitive test paper is unloaded by controlling the paper unloading device 23 and is sent to the paper unloading box 2312;
(4) after the water-sensitive test paper is unloaded, the rotating turntable 22 is controlled to rotate, when the test paper support 241 is not blocked between the infrared emission array belt 2313 and the infrared receiving array belt 235, the infrared receiving array belt 235 receives an infrared signal, infrared receiving data exist in AD sampling, the rotating turntable 22 is continuously controlled to rotate, when the infrared signal sent by the infrared emission array belt 2313 is blocked by the test paper support 241 again, no infrared receiving data exist in the AD sampling, the rotating turntable 22 stops rotating, at the moment, the paper feeding device 25 feeds the test paper support 241 with the water-sensitive test paper unloaded, the buzzer sounds for 2S, and whether the rotating turntable 22 rotates for a circle is judged:
if the rotary disc 22 rotates for one circle, the buzzer sounds for 5S, and then the step (5) is carried out;
if the turntable 22 does not rotate for one circle, the step (3) is carried out, and the fog drop patterns on the water-sensitive test paper are collected continuously;
(5) after the rotation of the turntable 22 is completed for one circle, it is determined whether the turntable 22 rotates for N detection cycles that are initially set:
if the turntable 22 does not rotate for N weeks, the step (2) is carried out, and the water-sensitive test paper continues to collect fogdrop images;
if the turntable 22 rotates for N cycles, the buzzer sounds for 30S, then the detection is finished, and the fogdrop particle size image acquisition instrument 2 is in a system standby state;
(6) and the PC end receives the image data of the spray droplets, then performs image processing on the acquired spray droplet images in Matalab, and calculates the actual particle size of the spray droplets.
As shown in fig. 18, the image processing of the collected spray droplet image includes pretreatment of the droplet image, image segmentation and calculation of the droplet particle size, the collected droplet image is shown in fig. 19, and the droplet image in the processing process is shown in fig. 20; the image preprocessing aims to obtain an effective spray droplet image, and can greatly accelerate the efficiency of later-stage image processing and analysis, so that the image processing result is more accurate and reliable. The image preprocessing step comprises the steps of obtaining an image, carrying out background removal, perspective transformation, image shearing (such as fig. 20(a)), image amplification and image graying (such as fig. 20(b)) on the obtained image, carrying out two-dimensional fast Fourier transformation on the droplet image, moving a DC component of the Fourier transformation to the center of a spectrum, carrying out Butterworth frequency domain low-pass filtering on the image, carrying out two-dimensional fast Fourier transformation, carrying out median filtering and denoising on the image. Image segmentation (as shown in fig. 20(c)) is to obtain a binary image convenient for calculating the droplet size, the image segmentation step includes maximum information entropy image segmentation processing, then inverting the image, removing points with an area larger than P and points with an area smaller than Q in the image, then performing image difference operation, labeling the droplet communicating region, then obtaining the pixel area, the pixel perimeter and the circularity of the labeled points, removing the droplet points with abnormal labels according to the circularity, and finally performing droplet size calculation. The step of calculating the actual particle size of the spray droplets comprises the steps of converting the pixel area of the fogdrop stains in the image into the actual area, then obtaining the particle size of the fogdrop stains, and completing the correction of the particle size of the fogdrop through correction coefficients such as a water-sensitive paper diffusion correction coefficient and a gravity diffusion correction coefficient, so as to obtain the actual particle size of the fogdrop.
Claims (10)
1. A spray droplet particle size detection device comprises a droplet particle size image acquisition instrument, a control module and an image processing module, wherein the control module controls the droplet particle size image acquisition instrument to acquire a droplet image, and the image processing module processes and analyzes the acquired droplet image to obtain the droplet particle size;
the housing comprises an upper cover, the upper cover comprises a mist inlet window which is arranged at the top of the upper cover and used for the mist spray to pass through;
the water-sensitive test paper placing device comprises a turntable, a turntable driving motor and a plurality of test paper supports, wherein the test paper supports are uniformly distributed along the circumference of the turntable, the fixed end of the turntable driving motor is fixedly connected with a shell, the turntable driving motor drives the turntable to rotate relative to the shell, the angle formed by one rotation of the turntable driving motor is equal to the angle formed by two adjacent test paper supports and the center of the turntable, and the test paper supports sequentially pass through the position under a fog inlet window along with the rotation of the turntable;
the paper feeding device is used for storing the water-sensitive test paper and sending the water-sensitive test paper to the test paper bracket;
the paper unloading device is used for unloading the water-sensitive test paper on the test paper support;
the test paper image acquisition device is arranged on the inner side of the upper cover, is positioned above the test paper support and is used for acquiring fog drop images of the water-sensitive test paper on the test paper support.
2. The apparatus of claim 1, wherein the upper cover further comprises a paper inlet and a paper outlet disposed at the side of the upper cover, the paper inlet and the paper outlet are respectively corresponding to two adjacent test paper supports, the paper inlet is disposed at the paper inlet, the paper outlet is disposed at the paper outlet, and the test paper image collecting device is disposed above the test paper support corresponding to the paper outlet.
3. The device for detecting the particle size of the spray droplets as claimed in claim 1, wherein the mist inlet window is provided with a window baffle for covering the mist inlet window and a baffle driving device for driving the window baffle to block the mist inlet window or driving the window baffle to move away from the blocked mist inlet window.
4. The device for detecting the particle size of the spray droplets according to claim 3, wherein the baffle driving device comprises a baffle bracket fixedly connected with the upper cover, a baffle driving motor fixedly arranged on the baffle bracket, a baffle driving gear set, a first lead screw and a first slider, the baffle driving motor drives the first lead screw to rotate by driving the baffle driving gear set, the first slider is in threaded connection with the first lead screw, the first lead screw rotates to drive the first slider to move along the extending direction of the first lead screw, the window baffle is connected with the first slider, the plane where the window baffle is located is parallel to the extending direction of the first lead screw, and the first slider moves to drive the window baffle to move to block the mist inlet window or move away from the position where the mist inlet window is blocked.
5. The device for detecting the particle size of spray droplets according to claim 1, wherein the paper feeding device comprises a paper feeding box fixedly connected to the housing, a friction pad is disposed at one end of the paper feeding box, a paper rolling wheel, a paper feeding driving gear set, a paper feeding driving motor, and a spring, the paper feeding box is used for storing clean water-sensitive test paper, the friction pad is connected to the paper feeding box through the spring, the paper rolling wheel is disposed above the friction pad, the paper feeding driving motor is fixedly disposed on a side surface of the paper feeding box, the paper feeding driving motor drives the paper rolling wheel to rotate by driving the paper feeding driving gear set, and the paper rolling wheel rotates to drive the water-sensitive test paper in the paper feeding box to reach the test paper support through the friction pad.
6. The device for detecting the particle size of spray droplets of claim 1, wherein the paper unloading device comprises a paper unloading box, a paper unloading support fixedly connected with the bottom of the upper cover, a paper unloading driving motor fixedly arranged on the paper unloading support, a paper unloading driving gear set, a second lead screw, a second slide block and a paper unloading push plate, the paper unloading driving motor drives the second lead screw to rotate by driving the paper unloading driving gear set, the second lead screw is in threaded connection with the second slide block, the second lead screw rotates to drive the second slide block to move along the extending direction of the second lead screw, the paper unloading push plate is fixedly connected with the second slide block, the second slide block moves to drive the paper unloading push plate to move, and the paper unloading push plate moves to push the water-sensitive test paper on the test paper support into the paper unloading box.
7. The device for detecting the particle size of the spray droplets according to claim 6, wherein the paper feeding end of the paper discharging box is provided with an infrared emission array belt for emitting infrared signals, the paper discharging bracket is provided with an infrared receiving array belt for receiving the infrared signals emitted by the infrared emission array belt, the highest point of the infrared emission array belt is not higher than the highest point of the test paper bracket, and when the test paper bracket is located between the infrared emission array belt and the infrared receiving array belt, the infrared signals emitted by the infrared emission array belt are blocked by the test paper bracket.
8. A detection method for the spray droplet size detection device of any one of claims 1 to 7, characterized by comprising the steps of:
(1) initializing a system, putting water-sensitive test paper on the test paper supports, and setting a detection period for N weeks;
(2) opening a fog inlet window, rotating the turntable for a circle, collecting fog drops on the water-sensitive test paper, and then closing the fog inlet window;
(3) the test paper image acquisition device acquires the spray droplet image of the water-sensitive test paper on the current corresponding test paper support, and then the water-sensitive test paper is dismounted;
(4) after the water-sensitive test paper is unloaded, the turntable is rotated, when the test paper image acquisition device corresponds to the water-sensitive test paper on the next test paper support, the turntable stops rotating, the test paper support unloading the water-sensitive test paper is fed with paper at the moment, and whether the turntable rotates for a circle is judged:
step (5) is carried out when the turntable rotates for one circle;
if the turntable does not rotate for one circle, performing the step (3);
(5) judging whether the turntable rotates for N circles:
if the rotating disc does not rotate for N circles, the step (2) is carried out;
the detection is finished when the turntable rotates for N circles;
(6) and carrying out image processing on the collected spray droplet image, and calculating the actual particle size of the spray droplets.
9. The detecting method according to claim 8, wherein the infrared transmitting array band and the infrared receiving array band are powered on after the fog inlet window is closed in the step (2), the rotating disc is rotated when the infrared receiving array band receives the infrared signal in the step (4), and the rotating disc stops rotating when the infrared receiving array band does not receive the infrared signal.
10. The detection method according to claim 8, wherein the image processing of the acquired spray droplet image in the step (6) comprises droplet image preprocessing and image segmentation; the image preprocessing step comprises image graying, image background removal, perspective transformation, image shearing and image filtering; the image segmentation step comprises maximum information entropy image segmentation processing and removal of abnormal points in the image; the step of calculating the actual particle size of the spray droplets comprises the steps of converting the pixel area of the droplet speckles in the image into the actual area, then obtaining the particle size of the droplet speckles, and finishing the correction of the particle size of the droplets through a correction coefficient to obtain the actual particle size of the droplets.
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