CN111044247A - Pesticide fog droplet drift testing arrangement - Google Patents
Pesticide fog droplet drift testing arrangement Download PDFInfo
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- CN111044247A CN111044247A CN201911201872.3A CN201911201872A CN111044247A CN 111044247 A CN111044247 A CN 111044247A CN 201911201872 A CN201911201872 A CN 201911201872A CN 111044247 A CN111044247 A CN 111044247A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
Abstract
The invention relates to the technical field of agriculture, and discloses a pesticide fog droplet drifting testing device which comprises a power section, a testing section and a backflow section. The power section is internally provided with an air supply module and a temperature and humidity adjusting module, the air supply module is used for generating a test air flow leading to the test section, and the temperature and humidity adjusting module is used for adjusting the temperature and the humidity of the test air flow; the testing air flow flows in the testing section along the horizontal direction, a spraying module is arranged above the inside of the testing section and used for spraying fog drops, and a fog drop collecting module is arranged on the bottom surface of the inside of the testing section and used for receiving the fog drops; the test airflow flows out of the test section and then flows into the power section through the backflow section. The pesticide fog drop drift testing device capable of accurately regulating and controlling the environmental parameters, provided by the embodiment of the invention, can effectively regulate and control the environmental temperature and the relative humidity while accurately controlling the wind speed, and has important significance for the research of the pesticide fog drop drift problem.
Description
Technical Field
The invention relates to the technical field of agriculture, in particular to a pesticide droplet drifting testing device.
Background
In the pesticide spraying process, due to the influence of environmental factors, about 20 to 30 percent of pesticide droplets drift to the environment around a target area along with wind, so that the pesticide injury of crops in a non-target area and the pollution of water sources and air environments are caused, and the safety of people and livestock is threatened. The research on the drift of pesticide fog drops is developed, the key problem of safe and reasonable use of pesticides is solved by reducing the loss of the pesticides, and the research is also an important research subject of pesticide application technology.
The pesticide droplet drifting research is widely applied to the fields of plant protection machinery, pesticide application technology, medicament characteristics and the like, and the mastering of the pesticide droplet drifting rule under different working conditions has important significance on aspects of spraying parameter selection, drifting reducing auxiliary agent research and development, spray head model matching, pesticide application buffer area standard establishment and the like of pesticide application machines.
At present, a field test method is mainly adopted for pesticide fog drop drifting research, a fog drop device such as water-sensitive paper, a polyester film card and the like is arranged at a position with a certain distance from a sprayer operation area to receive fog drops deposited on the ground, and a polyethylene wire is arranged in the air to receive the fog drops drifting in the air. The method has the defects that more testers are needed for carrying out the test, the test cost is higher, and the requirements on the area of a test field and peripheral obstacles are higher. In addition, in the test process, factors such as environmental wind speed, wind direction and temperature and humidity are variable and uncontrollable, the test difficulty is high, and repeated tests are difficult to perform.
Disclosure of Invention
The embodiment of the invention provides a pesticide fog droplet drifting test device, which is used for solving the problems that in the prior art, more test personnel are needed for carrying out a pesticide fog droplet drifting test, the cost is higher, the requirements on the area of a test site and peripheral obstacles are higher, in the test process, factors such as environmental wind speed, wind direction and temperature and humidity are variable and uncontrollable, the test difficulty is high, and the repeated operation is difficult.
The embodiment of the invention provides a pesticide fog droplet drift testing device, which comprises a power section, a testing section and a backflow section, wherein the power section is connected with the testing section;
an air supply module and a temperature and humidity adjusting module are arranged in the power section, the air supply module is used for generating a test air flow leading to the test section, and the temperature and humidity adjusting module is used for adjusting the temperature and humidity of the test air flow;
the test air flow flows in the horizontal direction in the test section, a spray module is arranged above the interior of the test section and used for spraying fog drops, and a fog drop collection module is arranged on the bottom surface of the interior of the test section and used for receiving the fog drops;
the test airflow flows out of the test section and then flows into the power section through the backflow section.
The power section is also internally provided with a first damping net, and the first damping net is arranged between the air supply module and the temperature and humidity adjusting module.
The testing section is internally provided with an environment measuring module, and the environment measuring module is slidably mounted on the inner side wall of the testing section and used for acquiring the temperature, the humidity and the wind speed of different sections of the testing section.
The device further comprises a steady flow section, and the test airflow flows into the test section through the steady flow section after flowing out of the power section; and a second damping net is arranged in the flow stabilizing section, and the aperture of the second damping net is smaller than that of the first damping net.
The steady flow section is internally provided with a honeycomb device with a honeycomb structure, the honeycomb device is positioned in the wind direction of the second damping net, the axis of a honeycomb hole forming the honeycomb structure is parallel to the flowing direction of the test airflow, and the length of the honeycomb hole is 5-10 times of the aperture of the honeycomb hole.
The backflow section comprises a corner portion, a flow guide piece is arranged on the corner portion, and the flow guide piece comprises a plurality of flow guide blades which are arranged at intervals.
The cross section of each guide vane is of a bent airfoil structure along the flow direction of the test airflow, the guide vanes are arranged at equal intervals, and the chord length of each guide vane is 0.3-0.6 times of the interval between every two adjacent guide vanes.
The spraying module comprises a spray rod and a slide rail, the slide rail is mounted on the inner top wall of the testing section, the spray rod is slidably mounted on the slide rail, and at least one spraying nozzle is mounted on the spray rod.
The rainfall module is arranged in the testing section and comprises a plurality of rainfall sprayers, the rainfall sprayers are mounted on the inner top wall of the testing section, and the rainfall sprayers are swing sprayers.
Wherein, the bottom surface of the test section is paved with rough elements;
the fog drop collection module comprises a plurality of support frames, and a plurality of polyethylene pipes are arranged on the support frames;
the backflow section is provided with a ventilation window, and a dust screen is arranged on the ventilation window.
The pesticide fog droplet drifting testing device provided by the embodiment of the invention aims at the limitation of field tests and simulates the external environment indoors to research the problem of fog droplet drifting. The device is characterized in that an air supply module and a temperature and humidity adjusting module are arranged in the power section of the device, and the air supply module can simulate the external environment to generate test air flow with set air speed, temperature and humidity. Compared with field tests, the device has certain boundary conditions indoors and changes of environmental conditions are small, so that pesticide droplet drifting tests performed in the test section of the device have good reliability and repeatability, and deep research on the generation mechanism, influence factors, pollution control and the like of pesticide droplet drifting is facilitated. The test section outlet and the power section inlet are connected through the backflow section, so that air flow forms closed circulation flow in the whole test device, the influence of the external environment on the inside of the device can be reduced, and the stable control and accurate adjustment of various parameters including flow rate, temperature and humidity of gas in the device are facilitated. Therefore, the pesticide fog droplet drifting testing device with the accurately adjustable environmental parameters, provided by the embodiment of the invention, can effectively adjust and control the environmental temperature and the relative humidity while accurately controlling the wind speed, and has important significance for researching the pesticide fog droplet drifting problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pesticide droplet drift testing device provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a corner structure according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an environmental control module according to another embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a droplet drift test in a test section according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a rainfall module according to another embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a cross-sectional measurement of a test section by an environmental measurement module according to another embodiment of the present invention;
in the figure: 1. an environment control module; 2. an air supply module; 3. a power section; 4. a first damping mesh; 5. a temperature and humidity adjusting module; 6. a flow guide member; 7. a steady flow section; 8. a liquid supply module; 9. a cellular device; 10. a second damping mesh; 11. a spray rod; 12. a testing section; 13. a coarse element; 14. an environment measurement module; 15. a spray module; 16. a guide slide block; 17. a rainfall module; 18. a reflux section; 19. a ventilation window; 20. a drain hole; 21. a support frame; 22. a polyethylene tube; 23. a water storage tank; 24. a water pump; 25. a voltage regulating unit; 26. a water delivery pipeline; 27. a rainfall sprayer; 28. measuring a profile; 29. measuring points; 30. a wind speed sensor; 31. a temperature sensor; 32. a humidity sensor.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
In addition, in the description of the present invention, "a plurality", and "a plurality" mean two or more unless otherwise specified.
As shown in fig. 1, the embodiment of the present invention provides a pesticide droplet drift testing apparatus, which includes a power section 3, a testing section 12, and a backflow section 18. An air supply module 2 and a temperature and humidity adjusting module 5 are arranged in the power section 3, the air supply module 2 is used for generating a test air flow leading to the test section 12, and the temperature and humidity adjusting module 5 is used for adjusting the temperature and humidity of the test air flow; the test air flow flows in the horizontal direction in the test section 12, a spray module 15 is arranged above the interior of the test section 12 and used for spraying fog drops, and a fog drop collection module is arranged on the bottom surface of the interior of the test section 12 and used for receiving the fog drops; the test gas stream flows from the test section 12 through the return section 18 into the power section 3.
Preliminary research shows that in the pesticide applying process, not only the wind field can have an important influence on the drifting of the fog drops, but also the fog drops of the liquid medicine are evaporated under the influence of temperature and relative humidity, so that the diameter of the fog drops is reduced, and the drifting of the pesticide fog drops is also intensified. The pesticide fog droplet drifting testing device provided by the embodiment of the invention aims at the limitation of field tests and simulates the external environment indoors to research the problem of fog droplet drifting. The device power section 3 is internally provided with an air supply module 2 and a temperature and humidity adjusting module 5, and can simulate the external environment to generate test air flow with set air speed, temperature and humidity. Compared with field tests, certain boundary conditions exist indoors, and environmental conditions change slightly, so that pesticide droplet drifting tests performed in the test section 12 of the device have good reliability and repeatability, and deep research on the generation mechanism, influence factors, pollution control and the like of pesticide droplet drifting is facilitated. The outlet of the testing section 12 is connected with the inlet of the power section 3 through the backflow section 18, so that the air flow forms closed circulation flow in the whole testing device, the influence of the external environment on the inside of the device can be reduced, and the stable control and accurate adjustment of various parameters of the air in the device, including flow rate, temperature and humidity, are facilitated.
Therefore, the pesticide fog droplet drifting testing device with the accurately adjustable environmental parameters, provided by the embodiment of the invention, can effectively adjust and control the environmental temperature and the relative humidity while accurately controlling the wind speed, and has important significance for researching the pesticide fog droplet drifting problem.
Based on the above embodiment, in the device, still be equipped with first damping net 4 in the power section 3, first damping net 4 is located between pneumatic conveying module 2 and temperature humidity control module 5. The test air current that flows out from pneumatic conveying module 2 flows into temperature and humidity control module 5 through first damping net 4, improves the degree of consistency of wind field through setting up first damping net 4.
Based on any of the above embodiments, in the apparatus, as shown in fig. 3, an environment measurement module 14 is further disposed in the test section 12, and the environment measurement module 14 is slidably mounted on an inner side wall of the test section 12 and is used for acquiring temperatures, humidity and wind speeds of different sections of the test section 12. As shown in fig. 5, the environment measuring module 14 can perform measuring movement according to a cross section inside the testing section 12, and the environment measuring module 14 includes a temperature sensor 31, a humidity sensor 32 and a wind speed sensor 30 for measuring temperature, humidity and wind speed information of different cross-sectional areas inside the testing section 12 in real time. The environmental measurement module 14 may also include a displacement unit for controlling the position of the sensors so that the environmental measurement module 14 can capture environmental parameters of the entire cross-sectional area of the test section 12 in a sequence.
The device can also include the environmental control module 1, and the environmental control module 1 obtains temperature, humidity and wind speed information from the environmental measurement module 14, matches with preset parameter to adjust the operation condition of pneumatic conveying module 2 and temperature and humidity control module 5 in the power section 3 in real time, realize the real-time accurate regulation and control of environmental parameter in the test section 12.
The wind power supply module 2 can be supplied with wind power by a plurality of independent fans which are closely arranged in a multistage series-parallel connection mode. For example, a plurality of axial flow fans are adopted to form the air supply module 2, the number of the fans is determined according to the range of the simulated wind speed value, the fan sets are arranged in series and parallel according to the size of the power section 3, each fan is provided with a frequency converter, the multi-stage regulation of the rotating speed of the fans is realized, the frequency converter sets are formed by the plurality of frequency converters and connected with the output end of the environment control module 1, the environment control module 1 outputs signals to the frequency converter sets, and the frequency converters regulate the rotating speeds of the corresponding fans.
The environment measuring module 14 in the test section is configured with the wind speed sensor 30, so that the ambient wind speed can be obtained in real time, meanwhile, as shown in fig. 6, the wind speed sensor 30 performs section motion in the test section, captures and positions wind speed values at different measuring points 29 of the measuring section 28, a wind speed signal is transmitted to the environment control module 1, the environment control module 1 analyzes the wind speed value and the flow field uniformity, determines the number, the rotating speed and the like of fans needing to be further adjusted, and sends a signal to a frequency converter of the corresponding fan, so that the cyclic adjustment of wind speed setting-fan regulation-wind speed measurement-fan readjustment is realized, and the wind speed value of the test section 12 is ensured to be a set value.
The air supply module 2 is provided with a first damping net 4 in the air outlet direction, so that the primary rectification of the air flow output by the fan is realized, and the temperature and humidity adjusting module 5 is used for adjusting the ambient temperature and the relative humidity in real time. The temperature and humidity adjusting module 5 comprises a heating unit, a humidifying unit, a dehumidifying unit and a fresh air unit, the fresh air unit comprises an air inlet fan and an air outlet fan, the air flow speed generated by the air outlet fan is smaller than the air flow speed generated by the air supply module 2, and the air outlet of the fan at the exhaust period can be adjusted in multiple angles. The environment measuring module 14 is provided with a temperature sensor 31 and a humidity sensor 32, which can measure the temperature and humidity of the measuring section 28 of the measuring section 12 and position and calibrate the measured value, the input end of the environment control module 1 receives the temperature and humidity measured by the sensor in the measuring section 12, the temperature and humidity measured value at each measuring point 29 of the measuring section 28 is analyzed to determine the uniformity of the distribution of the temperature and the humidity of the air flow, when the temperature and the humidity are inconsistent with the set value, the environment control module 1 outputs a corresponding signal to the temperature and humidity adjusting module 5, wherein the heating unit and the dehumidifying unit are matched with each other to adjust the temperature, the humidifying unit and the dehumidifying unit are matched to complete the humidity adjustment, the opening angle and the direction of fresh air are adjusted, and the device is kept in the set temperature and humidity.
On the basis of the above, a relatively uniform airflow with a certain speed, temperature and relative humidity is formed in the power section 3. The output end of the environment control module 1 is connected with the air supply module 2 and the temperature and humidity adjusting module 5, the input end of the environment control module is connected with each sensor of the environment measuring module 14, corresponding signals are output in real time according to parameters measured by the environment measuring module 14, and the rotating speed and the temperature and the humidity of the fan are adjusted.
Based on any embodiment, the device further comprises a steady flow section 7, and the test airflow flows out of the power section 3 and then flows into the test section 12 through the steady flow section 7; a second damping net 10 is arranged in the steady flow section 7, and the aperture of the second damping net 10 is smaller than that of the first damping net 4.
Based on the above embodiment, in the device, the steady flow section 7 is also provided with the honeycomb device 9 with the honeycomb structure, the honeycomb device 9 is positioned on the second damping net 10 in the wind direction, the axes of the honeycomb holes forming the honeycomb structure are parallel to the flow direction of the test airflow, and the length of the honeycomb holes is 5-10 times of the aperture of the honeycomb holes. The honeycombed device 9 is formed by arranging small honeycomb holes and pipelines with hexagonal equal cross sections in parallel, and has the function of guiding air flow to be parallel to the axis of the device, dividing large-size vortexes of the test air flow into small-size vortexes and accelerating the attenuation of the vortexes. The second damping net 10 is used for further dividing the large test airflow vortex, so that the airflow speed is uniformly distributed, and the airflow reaching the test section 12 is ensured to be uniform and stable. The test airflow enters the honeycomb device 9 to realize rectification, and then passes through the second damping net 10 to break the turbulent vortex, so that the test airflow is more uniform and stable. The test air flow enters the test section 12 after the pressure uniformity is realized in the steady flow section 7.
According to any of the above embodiments, in the device, the backflow section 18 comprises a corner part, the corner part is provided with the flow guide part 6, and the flow guide part 6 comprises a plurality of guide vanes which are arranged at intervals. Further, as shown in fig. 2, the cross section of the guide vane is a bent airfoil structure along the flow direction of the test airflow, the guide vanes are arranged at equal intervals, and the chord length of each guide vane is 0.3-0.6 times of the interval between adjacent guide vanes. The test airflow realizes turning at the corner part, and the turning of the test airflow is more stable by arranging the flow guide part 6 at the corner part, so that the disturbance caused by the turning of the test airflow is reduced. The upstream direction of the honeycomb 9 in the flow stabilizing section 7 can also be provided with corner parts, for example, the device can be provided with four corner parts, the test airflow is subjected to ninety-degree turning at each corner part, two corner parts are arranged in the upstream direction of the honeycomb 9 in the flow stabilizing section 7, and the other two corner parts are arranged in the return section 18; the guide vanes are correspondingly provided with ninety-degree bent angles, and the guide piece 6 consisting of the guide vanes can weaken the fluid separation and reduce the vortex area, thereby reducing the resistance loss of the corner parts and improving the airflow characteristics of the outlets of the corner parts.
Based on any embodiment, in the device, the spraying module 15 comprises a spray rod 11 and a slide rail, the slide rail is mounted on the inner top wall of the test section 12, the spray rod 11 is slidably mounted on the slide rail, and at least one spraying nozzle is mounted on the spray rod 11. For example, the spraying module 15 includes a stepping motor, a slide rail, a guide sliding block 16, a transmission belt, a spray rod 11, etc., the guide sliding block 16 is embedded inside the slide rail, one end of the transmission belt is sleeved on the stepping motor, the other end of the transmission belt is connected with the guide sliding block 16, the bottom end of the guide sliding block 16 is connected with the spray rod 11, the spray rod 11 realizes 0-2m/s uniform motion under the driving of the stepping motor, and the motion direction of the spray rod 11 is horizontal and perpendicular to the air flow direction. The spray rod 11 can be provided with a single spray nozzle or a plurality of spray nozzles, and can carry out fixed single-nozzle spraying or pesticide application operation under the operation state of a simulated multi-nozzle spraying machine. The rear end of the spray rod 11 is connected with a liquid supply module 8 for providing liquid medicine for the spray nozzle, and the liquid supply module comprises a pressure gauge, a liquid pump, a pressure regulating valve, a medicine tank, an opening and closing valve, a timer and the like, wherein the timer can accurately control the power-on time of the opening and closing valve, and further control the spraying time of the spray nozzle. For example, the timer can control the spraying time (5-15 seconds) of the spraying nozzle in a countdown mode, and when the countdown is finished, the on-off valve is powered off, and the spraying nozzle stops spraying.
Based on any of the above embodiments, in the device, a rainfall module 17 is further arranged in the test section 12, the rainfall module 17 includes a plurality of rainfall sprayers 27, the rainfall sprayers 27 are installed on the inner top wall of the test section 12, and the rainfall sprayers 27 are swing sprayers. For example, as shown in fig. 5, the rainfall module 17 mainly includes a swing type rainfall sprayer 27, a water pump 24, a water storage tank 23, a pressure regulating unit 25, and a water conveying pipeline 26, and liquid water is driven by the water pump 24, reaches the rainfall sprayer 27 through the water conveying pipeline 26, and is atomized into small liquid droplets with a specific diameter through the rainfall sprayer 27. The flow rate and the droplet size of the rainfall spray head 27 can be changed by adjusting the pressure of the water conveying pipeline 26 through the pressure adjusting unit 25. The rainfall module 17 generates fog drops, the diameters of the fog drops are coupled with a wind field, when the speed of the test air flow is high, the high fog drops are generated through pressure adjustment, and the influence on the test effect caused by the large drift of a large number of rain drops due to the high air flow speed is reduced. The rainfall module 17 can be used for testing retention and loss of fog drops on the surfaces of crop leaves in a rainfall environment, and the pesticide utilization rate is calculated according to the retention and loss.
According to any of the above embodiments, in the device, as shown in fig. 4, the bottom surface of the test section 12 is laid with rough elements 13 for reducing the influence of smooth boundaries on the air flow and the movement of the mist droplets. The surface of the rough element 13 can be provided with drain holes 20 distributed in a lattice mode, and the drain holes 20 are converged into a waste liquid collector through drain tubules. The fog drop collecting module comprises a plurality of supporting frames 21, a plurality of polyethylene pipes 22 are arranged on the supporting frames 21, and the polyethylene pipes 22 are arranged at different heights of the supporting frames 21 and used for receiving drifting fog drops. The reflux section 18 is provided with a ventilation window 19 to keep the air pressure inside and outside the device balanced; the ventilation window 19 is provided with a dust screen to prevent impurities from entering.
According to the pesticide droplet drift testing device provided by one embodiment of the invention, the testing operation can comprise the following steps:
and 4, fixing the spraying nozzle at a preset height, connecting the liquid supply module 8, adding a certain mass fraction of visible light or fluorescent tracer into the medicine tank, starting a liquid pump to enable the system to reach a preset pressure, and setting spraying time through a timer, wherein the concentration of the visible light or fluorescent tracer is 1-10 per mill.
And 5, starting a timer, opening an opening and closing valve, spraying by using a spraying nozzle, collecting the polyethylene pipe 22 after spraying is finished, and bringing the sample back to the laboratory to be tested.
And 6, testing the pesticide fog drops drifting under the motion state of the spray rod 11 if necessary, setting the motion speed of the spray rod 11, and driving the spray rod 11 to move at a preset speed by using a stepping motor.
And 7, if testing is needed in a rainfall environment, starting the rainfall module 17, adjusting the rainfall and the size of raindrops through the pressure adjusting unit 25, and placing crops to be tested at a certain height from the bottom surface of the testing section 12.
According to the embodiment, the pesticide fog droplet drifting test device provided by the invention is carried out in a mode of simulating a field environment indoors, the drifting characteristic of the pesticide fog droplets in a specific environment is obtained, and the problems that in the prior art, the drifting test is difficult to carry out due to complex and changeable external environment conditions, the spray head type selection and the research and development of the anti-drifting agent are optimized on the basis of the drifting characteristic. This device is connected test section 12 exports and 3 entrys of power section through backward flow section 18, makes the air current form closed circulation in whole testing arrangement and flows, compares in open type design, because device air intake and air outlet and external environment direct contact, ambient temperature, humidity, wind speed are difficult to effective control, the influence that can reduce external environment to the device is inside of this device, does benefit to the stable control and the accurate regulation of each item parameter including velocity of flow, temperature and humidity in the device gas. Therefore, the pesticide droplet drifting testing device provided by the invention can effectively make up the defect that the temperature, the humidity and the wind speed of the traditional droplet drifting testing device are difficult to stabilize, the influence of the external environment on the testing section 12 is effectively reduced by adopting the closed cycle design of the environmental parameters, and the internal temperature, the humidity and the wind speed of the device are accurately regulated and controlled by utilizing the feedback compensation control mode, so that the internal environment stability of the testing section 12 is ensured. The rainfall module 17 is arranged in the device, and researches on retention and loss of pesticide droplets on crop leaf surfaces can be developed. The invention provides a test device capable of accurately regulating and controlling environmental parameters for measuring pesticide fog drop drift.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A pesticide fog droplet drift testing device is characterized by comprising a power section, a testing section and a backflow section;
an air supply module and a temperature and humidity adjusting module are arranged in the power section, the air supply module is used for generating a test air flow leading to the test section, and the temperature and humidity adjusting module is used for adjusting the temperature and humidity of the test air flow;
the test air flow flows in the horizontal direction in the test section, a spray module is arranged above the interior of the test section and used for spraying fog drops, and a fog drop collection module is arranged on the bottom surface of the interior of the test section and used for receiving the fog drops;
the test airflow flows out of the test section and then flows into the power section through the backflow section.
2. The pesticide droplet drift testing device of claim 1, wherein a first damping net is further arranged in the power section, and the first damping net is arranged between the air supply module and the temperature and humidity adjusting module.
3. The pesticide fog droplet drift testing device of claim 1, wherein an environment measuring module is further arranged in the testing section, and the environment measuring module is slidably mounted on the inner side wall of the testing section and used for acquiring the temperature, the humidity and the wind speed of different sections of the testing section.
4. The pesticide droplet drift testing device of claim 2, further comprising a flow stabilizer, wherein the test gas stream flows from the power section and then flows into the test section through the flow stabilizer; and a second damping net is arranged in the flow stabilizing section, and the aperture of the second damping net is smaller than that of the first damping net.
5. The pesticide fog droplet drift test device of claim 4, wherein a honeycomb device with a honeycomb structure is further arranged in the steady flow section, the honeycomb device is located on the second damping net in the wind direction, the axis of honeycomb holes forming the honeycomb structure is parallel to the flow direction of the test airflow, and the length of the honeycomb holes is 5-10 times of the diameter of the honeycomb holes.
6. The pesticide mist drift test device of claim 1, wherein the return section comprises a corner portion, the corner portion being provided with a flow guide member, the flow guide member comprising a plurality of guide vanes arranged at intervals.
7. The pesticide fog droplet drift test device of claim 6, wherein the cross section of the guide vane is of a bent airfoil structure along the flow direction of the test air flow, the guide vanes are arranged at equal intervals, and the chord length of each guide vane is 0.3-0.6 times of the interval between every two adjacent guide vanes.
8. The pesticide droplet drift test device of claim 1, wherein the spray module comprises a spray bar and a slide rail, the slide rail is mounted on an inner top wall of the test section, the spray bar is slidably mounted on the slide rail, and at least one spray nozzle is mounted on the spray bar.
9. The pesticide fog droplet drift testing device of claim 1, wherein a rainfall module is further arranged in the testing section, the rainfall module comprises a plurality of rainfall sprayers, the rainfall sprayers are mounted on the inner top wall of the testing section, and the rainfall sprayers are oscillating sprayers.
10. The pesticide fog droplet drift testing device of claim 1, wherein the bottom surface of the testing section is paved with rough elements;
the fog drop collection module comprises a plurality of support frames, and a plurality of polyethylene pipes are arranged on the support frames;
the backflow section is provided with a ventilation window, and a dust screen is arranged on the ventilation window.
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Application publication date: 20200421 |