Liquid drop mass transfer measuring device for agricultural planting and planting method

Abstract

The invention provides a droplet mass transfer measuring device for agricultural planting and a planting method.The droplet mass transfer measuring device for agricultural planting comprises an observation room, a ventilation pipeline, a cooling mechanism, a heating mechanism, a humidifying mechanism, a drying mechanism, a wind speed regulation and control mechanism and a control module; the two ends of the observation chamber communicate with the cooling mechanism and the drying mechanism through ventilation pipelines correspondingly, the two ends of a wind speed regulation and control mechanism arranged between the drying mechanism and the humidifying mechanism communicate with the drying mechanism and the humidifying mechanism correspondingly, the humidifying mechanism communicates with the heating mechanism, and the heating mechanism communicates with the cooling mechanism. The observation chamber is communicated with the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism and the wind speed regulation and control mechanism to form frame-shaped closed-loop connection, the diameter of spraying liquid drops is set through the mass transfer efficiency of the liquid drops, and in the plant spraying process, the liquid drops are evaporated before falling to plant leaves, so that the plant spraying effect is improved. The humidity required by growth is achieved, and meanwhile liquid drops can be prevented from being dropped on plant leaves to form accumulated water.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural planting facilities, and in particular to a measuring device for droplet mass transfer for agricultural planting and a planting method. Background Art

[0002] Traditional agriculture has caused serious soil pollution due to excessive use of fertilizers and spraying of pesticides. At the same time, during the planting and watering process, it is impossible to accurately grasp the water requirements of plants, which can easily cause plants to be over-watered or under-watered. With the advancement of science and technology, modern agriculture emphasizes environmental protection and sustainable development, and adopts scientific planting methods. It saves water resources by automatically controlling water sources for irrigation, while reducing the input of chemical substances such as pesticides to protect the soil.

[0003] For example, the Chinese patent application number 202110655933.4, the classification number G06Q10 / 06, and the publication date 2022.12.13 discloses a method for automatically supplying water to plant cultivation. The system and method include automated water supply equipment, a main control module and sub-item control modules, a communication module, a background server system general platform, mobile phone APP, small programs, PC and other intelligent terminal devices and an intelligent control system cloud platform, a circuit integration module, a chip module, an energy system, etc. The system and method can control the water supply system through the intelligent terminal equipment and the intelligent control system platform in combination with the automated water supply system to automatically irrigate the plants that require water according to the set instructions or actions. The system can also add nutrients required for plant growth to the irrigation water or purify substances that are not conducive to plant growth, so that the plants can scientifically obtain the water required for growth, realize the automatic management and distribution of water and fertilizer supply, and enable the planted plants to meet the requirements of healthy growth, saving labor costs.

[0004] The above-mentioned document only performs automatic irrigation according to the required water content; it does not consider the monitoring of irrigation water quantity. During the plant planting process, the temperature and humidity of the planting environment need to be controlled at the same time to ensure that the plants can grow in an environment with suitable temperature and humidity. Existing planting facilities usually use fan wet curtains or spray cooling to control the temperature and humidity of the planting growth environment, but the facility cannot accurately control the size of the spray droplets. If the spray droplets are too large, it is easy to form water accumulation on the leaves of the plants, which makes the humidity of the plant growth environment exceed the humidity required for plant growth, making it difficult for the plants to grow and also wasting water resources. Summary of the invention

[0005] The purpose of the present invention is to provide a measuring device and planting method for droplet mass transfer for agricultural planting. The diameter of the spray droplets is set according to the mass transfer efficiency of the droplets. During the spraying process on plants, the droplets are evaporated before falling on the plant leaves, thereby achieving the humidity required for growth and avoiding the formation of water on the plant leaves.

[0006] To achieve the above-mentioned object, the present invention provides, on one hand, a method for realizing planting by using a measuring device for liquid droplet mass transfer for agricultural planting, wherein the measuring device for liquid droplet mass transfer comprises an observation chamber, wherein a temperature and humidity sensor and a high-speed camera are arranged in the observation chamber, and the method comprises the following steps: S1 presets the target wind speed, target temperature and target humidity in the observation room, and then uses the wind speed control mechanism to make the wind flow pass through the ventilation duct at the target wind speed and enter the observation room; S2 detects the temperature in the observation room through the temperature and humidity sensor. If the temperature reaches the target temperature, the process proceeds to step S3; otherwise, the temperature in the observation room is brought to the target temperature through the cooling mechanism or the heating mechanism; S3 detects the humidity in the observation room through the temperature and humidity sensor. If the target humidity is reached, the process proceeds to step S4; otherwise, the humidity in the observation room is made to reach the target humidity through the humidification mechanism or the drying mechanism; S4 injects droplets into the observation chamber through a micro-injector, then uses a high-speed camera to capture images of the droplet evaporation process and record the evaporation time on the preset plant leaf surface. t , after image processing, the droplet radius is obtained R and crown height h , and then calculate the droplet area S and droplet volume V, and according to the evaporation time t , droplet area S , droplet volume V And the droplet density ρ Calculate the mass transfer coefficient of the droplet N A ; S5 uses the quadratic regression orthogonal rotation combination method to simulate the wind speed range, temperature range and humidity range of the plant growth environment in the observation room, and records the corresponding evaporation time when the droplets reach the preset plant leaf surface t , and then the evaporation time was obtained by regression analysis t Wind speed in function expression v ,temperature T and humidity H The corresponding coefficients are then fitted to obtain the evaporation time t The function expression of is used to obtain the mass transfer coefficient of the droplet in the wind speed range, temperature range and humidity range of the plant growth environment. N A .

[0007] The above method presets the target wind speed, temperature and humidity parameters and then reaches the environmental conditions through the heating mechanism, cooling mechanism, humidifying mechanism and drying mechanism connected to the observation room, then drops are dripped into the observation room, and under simulated environmental conditions, the evaporation time is measured by a high-speed camera, and then the mass transfer coefficient of the current droplet is obtained, and then the mass transfer coefficient of the droplet and the radius suitable for the current droplet to be sprayed are determined under multiple target environments, and then spraying according to this spray radius can ensure that the droplets can be completely evaporated when they reach the plant surface after being sprayed under multiple environments, thereby preventing excessive water from remaining on the leaf surface of the plant after the droplets are sprayed.

[0008] Furthermore, step S5 further includes: According to the wind speed of the plant growth environment in the planting area v ,temperature T ,humidity T and the mass transfer coefficient N A Calculate the radius of the droplet R , and then adjust the spraying diameter of the spraying equipment to 2*R , and then spray the plants in the planting area so that the spray droplets evaporate before falling to the leaves of the plants.

[0009] The above method can simulate the wind speed, temperature and humidity required by plants at different growth stages through a droplet mass transfer measuring device, and then test the mass transfer coefficient of droplets of plants at different growth stages. The spray droplet diameter can be obtained through the mass transfer coefficient and the wind speed, temperature and humidity in the environment at different growth stages. In this way, during the spraying process on plants, the droplets can complete evaporation before falling on the leaves of the plants, achieving the humidity required for growth while avoiding the formation of water on the leaves of the plants.

[0010] Furthermore, in step S4 Droplet area S The calculation formula is as follows: , Droplet volume V The calculation formula is as follows: , Mass transfer coefficient N A The calculation formula is as follows: , in R is the droplet radius, h is the crown height, ρ is the droplet density, t is the droplet evaporation time.

[0011] The above settings are convenient for evaporation time t , droplet area S , droplet volume V And the droplet density ρ Calculate the mass transfer coefficient of the droplet N A .

[0012] On the other hand, the present invention also provides a measuring device for droplet mass transfer for agricultural planting, including an observation chamber, a ventilation duct, a cooling mechanism, a heating mechanism, a humidifying mechanism, a drying mechanism, a wind speed control mechanism and a control module. A micro-injector is provided on the top of the observation chamber, and the two ends of the observation chamber are respectively connected to the cooling mechanism and the drying mechanism through the ventilation duct, and the two ends of the wind speed control mechanism arranged between the drying mechanism and the humidifying mechanism are respectively connected to the drying mechanism and the humidifying mechanism, the humidifying mechanism is connected to the heating mechanism, and the heating mechanism is connected to the cooling mechanism. The two ends of the observation chamber and the cooling mechanism are respectively connected to the cooling mechanism and the drying mechanism through the ventilation duct, and the two ends of the wind speed control mechanism arranged between the drying mechanism and the humidifying mechanism are respectively connected to the drying mechanism and the humidifying mechanism. After the observation chamber is connected with the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism and the wind speed control mechanism, a frame-shaped closed-loop connection is formed. The control module is used to determine the evaporation time after the micro-injector injects droplets. t , droplet area S , droplet volume V And the droplet density ρ Determine the mass transfer coefficient of the droplet N A , and at the same time control the humidification mechanism, drying mechanism, heating mechanism, and cooling mechanism to open or close to simulate the wind speed range, temperature range, and humidity range of the working growth environment in the planting area, and determine the function expression of the droplet evaporation time t, wind speed v, temperature T, and humidity H; according to the mass transfer coefficient of the droplet and the function expression of the evaporation time t, wind speed v, temperature T, and humidity H, determine the radius of the current droplet suitable for injection.

[0013] The above arrangement can adjust the temperature, humidity and wind speed in the observation room through the cooling mechanism, heating mechanism, humidifying mechanism, drying mechanism and wind speed control mechanism respectively. In this way, different temperature, humidity and wind speed conditions can be set, and then the corresponding environmental conditions can be formed through the controller to measure the mass transfer coefficient of the droplets entering the observation room through the micro-injector. Finally, the required spray diameter of the droplets in the evaporation state when reaching the plant leaf surface under different environments can be calculated, so as to ensure that the spraying can be carried out with a radius that is more suitable for plant growth.

[0014] Furthermore, a high-speed camera is provided on one side of the observation room, a temperature and humidity sensor is provided in the observation room, and the control modules are connected to the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism, the wind speed control mechanism, and the temperature and humidity sensor.

[0015] The above setup can detect the temperature and humidity in the observation room through the temperature and humidity sensor, while the high-speed camera can capture the changes in the droplet evaporation process.

[0016] Furthermore, the cooling mechanism includes a cooling room, a main road 1, a bypass 1 and more than two solenoid valves 1, the bypass 1 is arranged on one side of the main road 1, the cooling room is connected to the main road 1, the main road 1 is connected to the ventilation duct, the solenoid valve 1 is connected to the bypass 1, the two ends of the bypass 1 are respectively connected to the two ends of the main road 1, a solenoid valve 1 is arranged between the cooling room and the connecting point between the bypass 1 and the main road 1, and a compressor is arranged in the cooling room.

[0017] With the above arrangement, when there is no need to cool the observation room, only the solenoid valve 1 connected to the bypass 1 is opened, so that the airflow entering the observation room does not pass through the cooling room; when it is necessary to cool the observation room, only the solenoid valve 1 arranged at both ends of the cooling room is opened, so that the airflow entering the observation room obtains a cooling effect after passing through the compressor of the cooling room, thereby reducing the temperature of the airflow entering the observation room.

[0018] Furthermore, the heating mechanism includes a heating chamber, a main path 2, a bypass 2 and two or more solenoid valves 2, the bypass 2 is arranged on one side of the main path 2, the heating chamber is connected to the main path 2, the main path 2 is connected to the ventilation duct, the solenoid valve 2 is connected to the bypass 2, the two ends of the bypass 2 are respectively connected to the two ends of the main path 2, the solenoid valve 2 is arranged between the heating chamber and the connecting point between the bypass 2 and the main path 2, and a ceramic heating plate is arranged in the heating chamber.

[0019] According to the above arrangement, when there is no need to heat the observation chamber, only the solenoid valve 2 connected to the bypass 2 is opened, so that the airflow entering the observation chamber does not pass through the heating chamber; when it is necessary to heat the observation chamber, only the solenoid valve 2 arranged at both ends of the heating chamber is opened, so that the airflow entering the observation chamber obtains the heating effect after passing through the ceramic heating plate of the heating chamber, thereby increasing the temperature of the airflow entering the observation chamber.

[0020] Furthermore, the humidification mechanism includes a humidification chamber, a main road three, a bypass road three and more than two solenoid valves three, the bypass road three is arranged on one side of the main road three, the humidification chamber is connected to the main road three, the main road three is connected to the ventilation duct, the solenoid valve three is connected to the bypass road three, the two ends of the bypass road three are respectively connected to the two ends of the main road three, the solenoid valve three is arranged between the humidification chamber and the connecting point between the bypass road three and the main road three, and an ultrasonic atomizing humidifier is arranged in the humidification chamber.

[0021] According to the above arrangement, when there is no need to humidify the observation room, only the solenoid valve three connected to the bypass three is opened, so that the airflow entering the observation room does not pass through the humidification chamber; when it is necessary to humidify the observation room, only the solenoid valves three arranged at both ends of the humidification chamber are opened, so that the airflow entering the observation room obtains the humidification effect after passing through the ultrasonic atomizing humidifier in the humidification chamber, thereby increasing the humidity of the airflow entering the observation room.

[0022] Furthermore, the drying mechanism includes a drying chamber, a main road four, a bypass road four and more than two solenoid valves four, the bypass road four is arranged on one side of the main road four, the drying chamber is connected to the main road four, the main road four is connected to the ventilation duct, the solenoid valve four is connected to the bypass road four, the two ends of the bypass road four are respectively connected to the two ends of the main road four, the solenoid valve four is arranged between the drying chamber and the connecting point between the bypass road four and the main road four, and a dryer is arranged in the drying chamber.

[0023] With the above arrangement, when it is not necessary to dry the observation room, only the solenoid valve four connected to the bypass four is opened, so that the airflow entering the observation room does not pass through the drying room; when it is necessary to dry the observation room, only the solenoid valves four arranged at both ends of the drying room are opened, so that the airflow entering the observation room obtains a drying effect after passing through the dryer of the drying room, thereby reducing the humidity of the airflow entering the observation room. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is the work flow chart of the present invention.

[0026] Figure 3 Schematic diagram of droplets on the micro-injector in the present invention.

[0027] Figure 4 Schematic diagram of the droplet effect in the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-4As shown, the present invention provides a measuring device for droplet mass transfer for agricultural planting, comprising an observation chamber 1, a ventilation duct 2, a cooling mechanism, a heating mechanism, a humidifying mechanism, a drying mechanism, a wind speed regulating mechanism 3 and a control module 4. The observation chamber 1 is connected with the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism and the wind speed regulating mechanism 3 to form a frame-shaped closed loop connection. A micro-injector (not shown in the figure) is provided on the top of the observation chamber 1 for injecting droplets. A high-speed camera 6 is provided on one side of the observation chamber 1 for photographing changes in the evaporation process of the droplets. A temperature and humidity sensor 7 is provided in the observation chamber 1 for detecting the temperature and humidity in the observation chamber 1. The control module 4 is connected with the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism, the wind speed regulating mechanism 3 and the temperature and humidity sensor 7. The two ends of the observation chamber 1 are respectively connected with the cooling mechanism and the drying mechanism through the ventilation duct 2, and one end of the cooling mechanism is connected with the ventilation duct 2 The cooling mechanism includes a cooling chamber 11, a main road 12, a bypass 13 and more than two solenoid valves 14. The bypass 13 is arranged on one side of the main road 12. The cooling chamber 11 is connected to the main road 12, and the main road 12 is connected to the ventilation duct 2. The solenoid valve 14 is connected to the bypass 13. The two ends of the bypass 13 are respectively connected to the two ends of the main road 12. A solenoid valve 14 is arranged between the cooling chamber 11 and the connecting part of the bypass 13 and the main road 12. A compressor is arranged in the cooling chamber 11. When it is not necessary to cool down the observation room 1, only the solenoid valve 14 connected to the bypass 13 is opened, so that the airflow entering the observation room 1 does not pass through the cooling chamber; when it is necessary to cool down the observation room 1, only the solenoid valves 14 arranged at both ends of the cooling chamber 11 are opened, so that the airflow entering the observation room 1 obtains a cooling effect after passing through the compressor of the cooling chamber 11, thereby reducing the temperature of the airflow entering the observation room 1.

[0030] The other end of the cooling mechanism is connected to the heating mechanism, which includes a heating chamber 21, a main path 22, a bypass 23 and more than two solenoid valves 24. The bypass 23 is arranged on one side of the main path 22. The heating chamber 21 is connected to the main path 22, and the main path 22 is connected to the ventilation duct 2. The solenoid valve 24 is connected to the bypass 23. The two ends of the bypass 23 are respectively connected to the two ends of the main path 22. A solenoid valve 24 is arranged between the connecting part of the heating chamber 21 and the bypass 23 and the main path 22. A ceramic heating plate is arranged in the heating chamber 21. When it is not necessary to heat the observation chamber 1, only the solenoid valve 24 connected to the bypass 23 is opened, so that the airflow entering the observation chamber 1 does not pass through the heating chamber; when it is necessary to heat the observation chamber 1, only the solenoid valves 24 arranged at both ends of the heating chamber 21 are opened, so that the airflow entering the observation chamber 1 obtains a heating effect after passing through the ceramic heating plate of the heating chamber 21, thereby increasing the temperature of the airflow entering the observation chamber 1.

[0031] The humidifying mechanism is connected with the heating mechanism, and the humidifying mechanism comprises a humidifying chamber 31, a main path 32, a bypass 33 and two or more solenoid valves 34. The bypass 33 is arranged on one side of the main path 32. The humidifying chamber 31 is connected to the main path 32, the main path 32 is connected with the ventilation duct 2, the solenoid valve 34 is connected to the bypass 33, and the two ends of the bypass 33 are respectively connected with the two ends of the main path 32. A solenoid valve 34 is arranged between the humidifying chamber 31 and the connection between the bypass 33 and the main path 32. There is an electromagnetic valve three 34, and an ultrasonic atomizing humidifier is arranged in the humidifying chamber 31. When it is not necessary to humidify the observation chamber 1, only the electromagnetic valve three 34 connected to the bypass three 33 is opened, so that the airflow entering the observation chamber 1 does not pass through the humidifying chamber; when it is necessary to humidify the observation chamber 1, only the electromagnetic valves three 34 arranged at both ends of the humidifying chamber 31 are opened, so that the airflow entering the observation chamber 1 obtains the humidification effect after passing through the ultrasonic atomizing humidifier of the humidifying chamber 31, thereby increasing the humidity of the airflow entering the observation chamber 1.

[0032] In this embodiment, the wind speed control mechanism 3 disposed between the drying mechanism and the humidifying mechanism is connected to the drying mechanism and the humidifying mechanism at both ends, the wind speed control mechanism 3 is a wind speed control machine, the drying mechanism is connected to the ventilation duct 2, the drying mechanism includes a drying chamber 41, a main road 442, a bypass 443 and more than two solenoid valves 44, the bypass 443 is disposed on one side of the main road 442, the drying chamber 41 is connected to the main road 442, the main road 442 is connected to the ventilation duct 2, the solenoid valve 444 is connected to the bypass 443, and the two ends of the bypass 443 are connected to the main road 44. The two ends of the drying chamber 42 are connected, and an electromagnetic valve four 44 is provided between the connecting part of the drying chamber 41 and the bypass four 43 and the main road four 42. A dryer is provided in the drying chamber 41. When it is not necessary to dry the observation chamber 1, only the electromagnetic valve four 44 connected to the bypass four 43 is opened, so that the airflow entering the observation chamber 1 does not pass through the drying chamber; when it is necessary to dry the observation chamber 1, only the electromagnetic valve four 44 provided at the two ends of the drying chamber 41 is opened, so that the airflow entering the observation chamber 1 obtains a drying effect after passing through the dryer of the drying chamber 41, thereby reducing the humidity of the airflow entering the observation chamber 1.

[0033] like Figure 2 As shown, a method for realizing planting by a measuring device for mass transfer of droplets for agricultural planting includes the following specific steps: S1 presets the target wind speed, target temperature and target humidity in the observation room, closes the solenoid valve 14 in the main path 12, the solenoid valve 24 in the main path 22, the solenoid valve 334 in the main path 32 and the solenoid valve 44 in the main path 42, opens the solenoid valve 14 in the bypass path 13, the solenoid valve 24 in the bypass path 23, the solenoid valve 334 in the bypass path 33 and the solenoid valve 44 in the bypass path 43, and makes the wind flow pass through the ventilation duct 2 at the target wind speed and then enter the observation room 1 through the wind speed control mechanism 3.

[0034] S2 detects the temperature in the observation room through the temperature and humidity sensor 7. If the target temperature is reached, step S3 is entered; otherwise, the temperature in the observation room is made to reach the target temperature through the cooling mechanism or the heating mechanism. In this embodiment, if the temperature in the observation room is lower than the target temperature, the solenoid valve 24 in the main path 22 is opened by the control module 4, and the solenoid valve 24 in the bypass 23 is closed at the same time, so that the airflow passes through the ceramic heating plate of the heating chamber 21 to achieve heating, thereby increasing the temperature; if the temperature in the observation room is higher than the target temperature, the solenoid valve 14 in the main path 12 is opened by the control module 4, and the solenoid valve 14 in the bypass 13 is closed at the same time, so that the airflow passes through the compressor of the cooling chamber 11 to achieve cooling, thereby lowering the temperature.

[0035] S3 detects the humidity in the observation room through the temperature and humidity sensor. If the target humidity is reached, step S4 is entered; otherwise, the humidity in the observation room is made to reach the target humidity through the humidification mechanism or the drying mechanism. In this embodiment, if the humidity in the observation room is lower than the target humidity, the solenoid valve three 34 in the main path three 32 is opened by the control module 4, and the solenoid valve three 34 in the bypass three 33 is closed, so that the airflow passes through the ultrasonic atomizing humidifier in the humidification chamber to achieve humidification, thereby increasing the humidity; if the humidity in the observation room is higher than the target humidity, the solenoid valve four 44 in the main path four 42 is opened by the control module 4, and the solenoid valve four 44 in the bypass four 43 is closed, so that the airflow passes through the dryer in the drying chamber 41 to achieve drying, thereby reducing the humidity.

[0036] S4 injects droplets into the observation chamber through a micro-injector, then uses a high-speed camera to capture images of the droplet evaporation process and records the time it takes for the current injected droplet to reach the preset evaporation time on the plant leaf surface. t For example, a high-speed camera is used to obtain multiple images of a droplet during the dripping process, and then after comparing the multiple images, the time when there is no droplet on the image is determined to be the evaporation time. In this embodiment, the height of the plant leaf surface is preset, and the time required for the droplet to evaporate when it reaches the preset height position is recorded. If the droplet has not evaporated when it reaches the leaf surface, the radius of the droplet can be reduced until the droplet evaporates when it reaches the leaf surface. Figure 3 and 4 As shown, the shape of the droplet on the microinjector. At this time, the droplet has not left the microinjector. The outline edge of the droplet is identified through the image, and then the corresponding droplet radius is measured in the image. R and crown height h , and then calculate the drop area S by subtracting the spherical cap area from the sphere area, and calculate the drop volume V by subtracting the spherical cap volume from the sphere volume. Droplet area S The calculation formula is as follows: (1), Droplet volume V The calculation formula is as follows: (2), According to the evaporation time t , droplet area S , droplet volume V And the droplet density ρ Calculate the mass transfer coefficient of the droplet N A , mass transfer coefficient N A The calculation formula is as follows: (3), in R is the droplet radius, h is the crown height, ρ is the droplet density, t is the droplet evaporation time.

[0037] S5 uses the quadratic regression orthogonal rotation combination method to simulate the wind speed range, temperature range and humidity range of the plant growth environment in the planting area in the observation room. In this embodiment, the wind speed range is 0-3m / s, the temperature range is 30-52℃, and the humidity range is 60-100%, and the evaporation time corresponding to the droplet is recorded. t , and the wind speed in Table 1 below is obtained v ,temperature T and humidity T Corresponding evaporation time t , Table 1

[0038] Then the evaporation time was obtained by regression analysis. t Wind speed in function expression v ,temperature T and humidity H The corresponding coefficients are then fitted to obtain the evaporation time t The function expression is as follows: (4), Substituting equation (4) into equation (3), we can obtain the mass transfer coefficient of the droplet in the wind speed range, temperature range and humidity range of the plant growth environment: N A ,as follows: .

[0039] S6 According to the wind speed of the plant growth environment in the planting area v ,temperature T ,humidity H and the mass transfer coefficientN A Calculate the radius of the droplet R , and then adjust the spraying diameter of the spraying equipment to 2R , by making the spraying aperture of the spraying equipment the diameter of the droplets so that the droplets can be sprayed out through the spraying aperture, and then spraying the plants in the planting area so that the spray droplets evaporate before falling to the leaves of the plants.

[0040] The working principle of the present invention is as follows: by presetting the target wind speed, temperature and humidity parameters, the environmental conditions are achieved through the heating mechanism, cooling mechanism, humidifying mechanism and drying mechanism connected to the observation chamber, and then droplets are dripped into the observation chamber. Under the simulated environmental conditions, the evaporation time is measured by a high-speed camera, and then the mass transfer coefficient of the current droplets is obtained. Then, the mass transfer coefficient of the droplets and the radius suitable for the current droplets to be sprayed are determined under multiple target environments. Then, spraying according to this spray radius can ensure that the droplets can be completely evaporated when they reach the plant surface after being sprayed under multiple environments, thereby preventing excessive water from remaining on the leaf surface of the plant after the droplets are sprayed.

Claims

1. A method for realizing planting by using a liquid droplet mass transfer measuring device for agricultural planting, wherein the liquid droplet mass transfer measuring device comprises an observation chamber, wherein a temperature and humidity sensor is arranged in the observation chamber, and wherein: The following steps are involved: S1 presets the target wind speed, target temperature and target humidity in the observation room, and then uses the wind speed control mechanism to make the wind flow pass through the ventilation duct at the target wind speed and enter the observation room; S2 detects the temperature in the observation room through the temperature and humidity sensor. If the temperature reaches the target temperature, the process proceeds to step S3; otherwise, the temperature in the observation room is brought to the target temperature through the cooling mechanism or the heating mechanism; S3 detects the humidity in the observation room through the temperature and humidity sensor. If the target humidity is reached, the process proceeds to step S4; otherwise, the humidity in the observation room is made to reach the target humidity through the humidification mechanism or the drying mechanism; S4 injects droplets into the observation chamber through a micro-injector, then uses a high-speed camera to capture images of the droplet evaporation process and records the time it takes for the current injected droplet to reach the preset evaporation time on the plant leaf surface. t , after image processing, the droplet radius is obtained R and crown height h , and then calculate the droplet area S and droplet volume V, and according to the evaporation time t , droplet area S , droplet volume V And the droplet density ρ Determine the mass transfer coefficient of the droplet N A ; S5 simulates the wind speed range, temperature range and humidity range of the plant growth environment in the observation room, and records the evaporation time of the droplets reaching the preset plant leaves. t , and then the droplet evaporation time is obtained by using the quadratic regression orthogonal rotation combination method t , wind speed v ,temperature T and humidity H The function expression of the mass transfer coefficient of the droplet in step S4 and the evaporation time t , wind speed v ,temperature T and humidity H The function expression determines the radius of the current droplet suitable for injection.

2. A method for realizing planting by using a measuring device for mass transfer of droplets for agricultural planting according to claim 1, characterized in that: The step S5 is also included: According to the wind speed of the plant growth environment in the planting area v ,temperature T ,humidity T and the mass transfer coefficient N A Calculate the radius of the droplet R , and then adjust the spraying diameter of the spraying equipment to 2R , and then spray the plants in the planting area so that the spray droplets evaporate before falling to the leaves of the plants.

3. A method for realizing planting by a measuring device for liquid droplet mass transfer for agricultural planting according to claim 1, characterized in that: In step S4 Droplet area S The calculation formula is as follows: ， Droplet volume V The calculation formula is as follows: ， Mass transfer coefficient N A The calculation formula is as follows: ， R is the droplet radius, h is the crown height, ρ is the droplet density, t is the droplet evaporation time.

4. A measuring device for droplet mass transfer for agricultural planting according to any one of claims 1 to 3, characterized in that: The invention comprises an observation chamber, a ventilation duct, a cooling mechanism, a heating mechanism, a humidifying mechanism, a drying mechanism, a wind speed regulating mechanism and a control module. A micro-injector is arranged on the top of the observation chamber. The humidifying mechanism is connected with the heating mechanism, and the heating mechanism is connected with the cooling mechanism. The two ends of the observation chamber and the cooling mechanism are respectively connected with the cooling mechanism and the drying mechanism through the ventilation duct. The two ends of the wind speed regulating mechanism arranged between the drying mechanism and the humidifying mechanism are respectively connected with the drying mechanism and the humidifying mechanism. The humidifying mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism and the wind speed regulating mechanism are connected to form a frame-shaped closed loop connection. The control module is used to determine the evaporation time after the micro-injector injects the droplets. t , droplet area S , droplet volume V And the droplet density ρ Determine the mass transfer coefficient of the droplet N A At the same time, the humidification mechanism, drying mechanism and heating mechanism are controlled to be turned on or off to simulate the wind speed range, temperature range and humidity range of the growth environment in the planting area, and the function expression of the droplet evaporation time t, wind speed v, temperature T and humidity H is determined. According to the mass transfer coefficient of the droplet and the function expression of the evaporation time t, wind speed v, temperature T and humidity H, the radius of the current droplet suitable for injection is determined.

5. The measuring device for liquid droplet mass transfer for agricultural planting according to claim 1, characterized in that: A high-speed camera is provided on one side of the observation room, a temperature and humidity sensor is provided in the observation room, and the control modules are connected with the cooling mechanism, the heating mechanism, the humidifying mechanism, the drying mechanism, the wind speed control mechanism, and the temperature and humidity sensor.

6. The measuring device for liquid droplet mass transfer for agricultural planting according to claim 1, characterized in that: The cooling mechanism includes a cooling room, a main road, a bypass and more than two solenoid valves. The bypass is arranged on one side of the main road. The cooling room is connected to the main road. The main road is connected to the ventilation duct. The solenoid valve is connected to the bypass. The two ends of the bypass are respectively connected to the two ends of the main road. A solenoid valve is arranged between the cooling room and the connection point between the bypass and the main road. A compressor is arranged in the cooling room.

7. The measuring device for droplet mass transfer for agricultural planting according to claim 1, characterized in that: The heating mechanism includes a heating chamber, a main path 2, a bypass path 2 and more than two solenoid valves 2. The bypass path 2 is arranged on one side of the main path 2. The heating chamber is connected to the main path 2. The main path 2 is connected to the ventilation duct. The solenoid valve 2 is connected to the bypass path 2. The two ends of the bypass path 2 are respectively connected to the two ends of the main path 2. The solenoid valve 2 is arranged between the heating chamber and the connection point between the bypass path 2 and the main path 2. A ceramic heating plate is arranged in the heating chamber.

8. The apparatus for measuring mass transfer of liquid droplets for agricultural planting according to claim 1, characterized in that: The humidification mechanism includes a humidification chamber, a main road three, a bypass road three and more than two solenoid valves three. The bypass road three is arranged on one side of the main road three. The humidification chamber is connected to the main road three. The main road three is connected to the ventilation duct. The solenoid valve three is connected to the bypass road three. The two ends of the bypass road three are respectively connected to the two ends of the main road three. The solenoid valve three is arranged between the humidification chamber and the connection point between the bypass road three and the main road three. An ultrasonic atomizing humidifier is arranged in the humidification chamber.

9. The measuring device for droplet mass transfer for agricultural planting according to claim 1, characterized in that: The drying mechanism includes a drying chamber, a main road four, a bypass road four and more than two solenoid valves four. The bypass road four is arranged on one side of the main road four. The drying chamber is connected to the main road four. The main road four is connected to the ventilation duct. The solenoid valve four is connected to the bypass road four. The two ends of the bypass road four are respectively connected to the two ends of the main road four. A solenoid valve four is arranged between the drying chamber and the connecting point between the bypass road four and the main road four. A dryer is arranged in the drying chamber.

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