A droplet size control device and method of control during application

Abstract

The application belongs to the technical field of pesticide application control, and provides a mist droplet size control device and a control method in a pesticide application process.The device comprises a pesticide box installed on a plant protection unmanned aerial vehicle, an air pump and a motor fixed on the pesticide box, an air conveying pipe of the air pump connected with the pesticide box, two through holes formed in the bottom of the pesticide box, a flow resistance rod fixed above each of the two through holes in the pesticide box, the two flow resistance rods matched with a first pesticide conveying pipe and a second pesticide conveying pipe respectively, the first pesticide conveying pipe and the second pesticide conveying pipe penetrating through the through holes and connected with a first pesticide spraying device and a second pesticide spraying device respectively, and a switching mechanism installed on the pesticide box, wherein the motor drives the switching mechanism to realize reverse motion of the first pesticide conveying pipe and the second pesticide conveying pipe and alternating cooperation with the flow resistance rods, so that the switching of different pesticide spraying devices in the pesticide application process is realized, the labor of the operator is reduced, and the efficiency of pesticide spraying is improved.

Description

TECHNICAL FIELD

[0001] The present application is suitable for the technical field of pesticide application control, and particularly provides a mist droplet size control device and a control method in a pesticide application process. BACKGROUND

[0002] China is a large agricultural country, and the pesticide production technology has reached the international advanced level. With the development of science and technology, the plant protection unmanned aerial vehicle for pesticide application has been widely used in the field of agricultural plant protection. The plant protection unmanned aerial vehicle is simple to operate, safe, reliable and efficient, and is favored by most farm contractors and farmers. The plant protection unmanned aerial vehicle needs to control the mist droplet size sprayed by the sprayer during pesticide spraying. Since large mist droplets are beneficial to sedimentation, small mist droplets have high coverage and good penetration. In order to make the pesticide work best, the best way is to find a suitable balance point, i.e. the best particle size, in the size of mist droplets, so as to fully exert the advantages brought by the particle size, thereby effectively preventing and controlling diseases, pests and weeds.

[0003] During the pesticide application process of the plant protection unmanned aerial vehicle, since the structures of the spray heads are different, the operator can only control the size of the mist droplet within a certain range during the pesticide application operation after the spray head is installed, which cannot meet the actual production requirements. Usually, the operator will carry different spray heads with different mist droplet sizes during pesticide application, and select and use them according to different pesticide application conditions. When the spray head is replaced, the unmanned aerial vehicle needs to be retrieved and replaced, which affects the pesticide application efficiency. SUMMARY

[0004] The present application aims to provide a mist droplet size control device which can complete the switching of different pesticide application devices during the pesticide application process.

[0005] In order to achieve the above-mentioned purpose, the present application provides a mist droplet size control device, which comprises a pesticide tank installed on a plant protection unmanned aerial vehicle, a gas pump and a motor fixed on the pesticide tank, a gas conveying pipe of the gas pump connected and communicated with the pesticide tank, two through holes formed in the bottom of the pesticide tank, a flow resistance rod fixed above each of the two through holes in the pesticide tank, two flow resistance rods matched with a first pesticide conveying pipe and a second pesticide conveying pipe respectively, the first pesticide conveying pipe and the second pesticide conveying pipe penetrating through the through holes and connected and communicated with a first pesticide application device and a second pesticide application device respectively, and a switching mechanism installed on the pesticide tank, wherein the motor drives the switching mechanism to realize the reverse motion of the first pesticide conveying pipe and the second pesticide conveying pipe to alternately cooperate with the flow resistance rods.

[0006] Preferably, the switching mechanism comprises a gear fixed coaxially with the output shaft of the motor, the gear is engaged with a first rack and a second rack, the first rack and the second rack are fixedly connected with one end of a first sliding block and a second sliding block respectively, the first sliding block and the second sliding block are slidingly connected with a first guide rail and a second guide rail fixed on the medicine box respectively, the other end of the first sliding block and the second sliding block is fixedly connected with a first pesticide spraying device and a second pesticide spraying device through a first bending rod and a second bending rod respectively.

[0007] Preferably, the first pesticide spraying device comprises a third pesticide conveying pipe connected with the first pesticide conveying pipe and in communication and connected with the first bending rod, a first pesticide spraying head connected with the third pesticide conveying pipe and in communication, a rotatable rotating cage installed on the outer side of the first pesticide spraying head, a driving fan coaxially fixed with the rotating cage, and a fan installed at the bottom of the medicine box and matched with the driving fan; a plurality of first pesticide spraying ports are annularly formed in the outer wall of the first pesticide spraying head.

[0008] Preferably, the second pesticide spraying device comprises a fourth pesticide conveying pipe connected with the second pesticide conveying pipe and in communication and connected with the second bending rod, a spiral pipe connected with the fourth pesticide conveying pipe and in communication, and a second pesticide spraying head sleeved outside the spiral pipe and fixed with the fourth pesticide conveying pipe; a plurality of second pesticide spraying ports are annularly formed in the outer wall of the second pesticide spraying head.

[0009] Preferably, a storage battery electrically connected with the air pump is fixed on the medicine box, the air pump is further wirelessly connected with a remote controller, and the storage battery is electrically connected with the fan.

[0010] Preferably, a bending baffle is fixed on the medicine box, an inductive switch capable of being overlapped with the second rack is arranged on the bending baffle, and the inductive switch is electrically connected with the fan.

[0011] Preferably, a rubber layer is arranged on the inner wall of the first pesticide conveying pipe and the second pesticide conveying pipe.

[0012] Preferably, a wind speed sensor is installed on the side wall of the medicine box, and the wind speed sensor is wirelessly connected with the motor.

[0013] Preferably, the motor is a stepping motor, and the motor is wirelessly connected with the remote controller.

[0014] The method for controlling the size of the mist droplets in the pesticide application process by using the above-mentioned mist droplet size control device comprises the following steps:

[0015] ①adding pesticide liquid to be applied into the medicine box;

[0016] ②starting the unmanned aerial vehicle to fly above the area to be applied, and starting the air pump and the motor through the remote controller;

[0017] ③The operator judges that small-diameter droplets need to be sprayed, and controls the motor to rotate counterclockwise through the remote controller; the operator judges that large-diameter droplets need to be sprayed, and controls the motor to rotate clockwise through the remote controller;

[0018] ④During the spraying process of the first spraying device, the wind speed sensor detects that the external environment is not conducive to the settling of droplets, and controls the motor to rotate clockwise.

[0019] The present application has the following beneficial effects:

[0020] ①By setting the motor-controlled switching mechanism, switching between different spraying devices during the spraying process is achieved, reducing the labor of the operator and improving the efficiency of spraying.

[0021] ②The liquid sprayed from the first spraying port is evenly atomized into small droplets by the rotating rotating cage, increasing the number of droplets, and the probability of the droplets hitting the target will significantly increase.

[0022] ③By setting the spiral pipe in cooperation with the plurality of second spraying ports, the water flow in the spiral pipe is subjected to strong rotational motion, and when sprayed, it is converted into large-diameter droplets that are easy to settle, ensuring the accuracy of the spraying. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described in detail below in conjunction with the drawings and specific embodiments:

[0024] Figure 1 is a structural schematic view of the first perspective of the present application;

[0025] Figure 2 is a structural schematic view of the second perspective of the present application;

[0026] Figure 3 is a structural schematic view of the first spraying device;

[0027] Figure 4 is a structural schematic view of the second spraying device;

[0028] In the figure: 10 - medicine box; 20 - air pump; 200 - switching mechanism; 201 - motor; 202 - gear; 203 - first rack; 204 - second rack; 205 - first slider; 206 - second slider; 207 - first guide rail; 208 - second guide rail; 209 - first bending rod; 210 - second bending rod; 21 - through hole; 30 - resistance flow rod; 31 - first medicine conveying pipe; 32 - second medicine conveying pipe; 40 - first medicine spraying device; 401 - third medicine conveying pipe; 402 - first medicine spraying head; 403 - rotating cage; 404 - driving fan; 405 - air blower; 406 - first medicine spraying port; 50 - second medicine spraying device; 501 - fourth medicine conveying pipe; 502 - spiral pipe; 503 - second medicine spraying head; 504 - second medicine spraying port; 60 - battery; 70 - bending baffle; 71 - induction switch; 80 - wind speed sensor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0030] Referring to Figure 1 The present application aims to provide a droplet size control device, comprising a medicine box 10 installed on a plant protection unmanned aerial vehicle, the installation mode of the medicine box 10 and the unmanned aerial vehicle being fixed by bolts and nuts, facilitating installation and disassembly, the medicine box 10 containing liquid medicine to be sprayed, the medicine box 10 being fixed with an air pump 20, the end of the air conveying pipe of the air pump 20 being fixedly connected with the medicine box 10 and being in communication, two through holes 21 being formed in the bottom end of the medicine box 10, resistance flow rods 30 being fixed above the two through holes 21 in the interior of the medicine box 10, respectively, the resistance flow rods 30 being capable of sealingly cooperating with one end of first medicine conveying pipes 31 and second medicine conveying pipes 32, the specific mode being that when the resistance flow rods 30 extend into the first medicine conveying pipes 31 and the second medicine conveying pipes 32, the liquid in the medicine box 10 cannot enter the medicine conveying pipes, wherein the end of the first medicine conveying pipes 31 and the second medicine conveying pipes 32 cooperating with the resistance flow rods 30 is provided with a horn opening which is wide at the top and narrow at the bottom, so that the resistance flow rods 30 can more accurately extend into the medicine conveying pipes and form sealing cooperation therewith, the first medicine conveying pipes 31 and the second medicine conveying pipes 32 passing through the through holes 21 formed in the bottom of the medicine box 10, the cooperation mode between the outer wall of the medicine conveying pipes and the through holes 21 being movable sealing connection, the first medicine conveying pipes 31 and the second medicine conveying pipes 32 being fixedly connected with first medicine spraying devices 40 and second medicine spraying devices 50 and being in communication, the medicine box 10 further being provided with a switching mechanism 200, a motor 201 driving the switching mechanism 200 to realize the reverse up-down movement of the first medicine conveying pipes 31 and the second medicine conveying pipes 32 and alternately sealingly cooperating with the resistance flow rods 30.

[0031] The motor 201 and the air pump 20 can be electrically connected with the power system of the unmanned aerial vehicle, and driving force is provided by the power system of the unmanned aerial vehicle, or a storage battery 60 is installed on the top of the medicine box 10, and the air pump 20 is powered by the storage battery 60.

[0032] The motor 201 is a stepping motor, which has the advantages that it can move step by step according to a control signal, and each time a fixed number of steps are moved, and the motor 201 is internally provided with a driving module, an electric control module electrically connected with the driving module, and a wireless signal receiving module electrically connected with the electric control module, an operator holds a remote controller, the remote controller is internally provided with a wireless signal transmitting module, the wireless signal receiving and transmitting modules use a wireless communication mode, and the user can directly control the motor 201 through the remote controller.

[0033] The air pump 20 is internally provided with a driving module, an electric control module electrically connected with the driving module, and a wireless signal receiving module electrically connected with the electric control module, and the operator can directly control the air pump 20 through the remote controller.

[0034] Working principle: first, the air pump 20 supplies air to the medicine box 10 to increase the air pressure in the medicine box 10, and then the motor 201 drives the switching mechanism 200 to realize the alternating up-down movement of the first medicine conveying pipe 31 and the second medicine conveying pipe 32 in sealing cooperation with the flow resistance rod 30, when the first medicine conveying pipe 31 is in sealing cooperation with the flow resistance rod 30, the liquid medicine can enter the second medicine spraying device 50 through the second medicine conveying pipe 32 and be sprayed out through the second medicine spraying device 50, and when the second medicine conveying pipe 32 is in sealing cooperation with the flow resistance rod 30, the liquid medicine can enter the first medicine spraying device 40 through the first medicine conveying pipe 31 and be sprayed out through the first medicine spraying device 40.

[0035] The switching mechanism 200 controlled by the motor 201 enables the operator to remotely control the motor 201 to switch the first medicine spraying device 40 and the second medicine spraying device 50 during the spraying process, without the need to replace the spraying head after the unmanned aerial vehicle is recovered, thereby reducing the labor of the operator and improving the spraying efficiency.

[0036] As a further explanation of the present application, see Figure 2The switching mechanism 200 includes a gear 202 fixed coaxially with the output shaft of the motor 201, first and second racks 203, 204 configured on both sides of the gear 202 and engaged with the gear 202, the lower end of the first rack 203 is fixedly connected with the upper end of a first sliding block 205, the lower end of the second rack 204 is fixedly connected with the upper end of a second sliding block 206, the first sliding block 205 is configured in the first guide rail 207 and moves along the first guide rail 207, the second sliding block 206 is configured in the second guide rail 208 and moves along the second guide rail 208, the first and second guide rails 207, 208 are fixed on the side wall of the medicine box 10, the lower end of the first sliding block 205 is fixedly connected with one end of a first bent rod 209, the other end of the first bent rod 209 is fixedly connected with the first medicine spraying device 40, the lower end of the second sliding block 206 is fixedly connected with one end of a second bent rod 210, the other end of the second bent rod 210 is fixedly connected with the second medicine spraying device 50.

[0037] Working principle: when the first medicine spraying device 40 is needed to spray liquid medicine, the output shaft of the motor 201 rotates counterclockwise, thereby driving the gear 202 to rotate counterclockwise, since the gear 202 is engaged with the first and second racks 203, 204, the first rack 203 is driven to move downward, the second rack 204 is driven to move upward, thereby driving the first sliding block 205 to move downward, the second sliding block 206 to move upward, the first sliding block 205 to move downward drives the first bent rod 209 to move downward, thereby driving the first medicine spraying device 40 and the first medicine conveying pipe 31 to move downward, the second sliding block 206 to move upward drives the second bent rod 210 to move upward, thereby driving the second medicine spraying device 50 and the second medicine conveying pipe 32 to move upward, the choke rod 30 does not contact the first medicine conveying pipe 31, and the liquid medicine can enter the first medicine spraying device 40 through the first medicine conveying pipe 31 and be sprayed out of the first medicine spraying device 40, at this time the choke rod 30 extends into the second medicine conveying pipe 32 to form a sealing fit, and the liquid medicine cannot enter the second medicine conveying pipe 32;

[0038] When the second spraying device 50 needs to spray liquid medicine, the output shaft of the motor 201 rotates clockwise, thereby driving the gear 202 to rotate clockwise. Since the gear 202 is in meshing connection with the first rack 203 and the second rack 204, the second rack 204 is driven to move downward, and the first rack 203 is driven to move upward, thereby driving the second sliding block 206 to move downward and the first sliding block 205 to move upward. The downward movement of the second sliding block 206 drives the second bending rod 210 to move downward, thereby driving the second spraying device 50 and the second medicine conveying pipe 32 to move downward. The upward movement of the first sliding block 205 drives the first bending rod 209 to move upward, thereby driving the first spraying device 40 and the first medicine conveying pipe 31 to move upward. The blocking rod 30 does not contact the second medicine conveying pipe 32, and the liquid medicine can enter the second spraying device 50 through the second medicine conveying pipe 32 and be sprayed out of the second spraying device 50. At this time, the blocking rod 30 extends into the first medicine conveying pipe 31 to form a sealing fit, and the liquid medicine cannot enter the first medicine conveying pipe 31.

[0039] As a further explanation of the present application, see Figure 1 、 Figure 3 The first spraying device 40 comprises a third medicine conveying pipe 401 in sealing connection and communication with the first medicine conveying pipe 31. One end of the third medicine conveying pipe 401 is fixedly connected with the first bending rod 209, and the other end of the third medicine conveying pipe 401 is fixedly connected with and in communication with a first spraying head 402. The outer circumferential surface of the middle part of the first spraying head 402 is provided with a rotating cage 403 through a bearing. The rotating cage 403 is coaxially fixed with a driving fan 404, that is, the rotating cage 403 and the driving fan 404 can rotate around the central axis of the first spraying head 402. A fan 405 is arranged above the driving fan 404. The fan 405 is fixed on the bottom of the medicine tank 10. The fan 405 is powered by the storage battery 60 to generate high-speed airflow. A plurality of first spraying openings 406 are arranged in the outer wall of the first spraying head 402 in a ring shape. A bending baffle 70 is fixed on the medicine tank 10. An induction switch 71 capable of being overlapped with the second rack 204 is arranged on the bending baffle 70. The induction switch 71 is electrically connected with the fan 405.

[0040] Working principle: When the second rack 204 moves upward and overlaps with the induction switch 71, the induction switch 71 starts the fan 405. The high-speed airflow blown out of the fan 405 drives the driving fan 404 to rotate, thereby driving the rotating cage 403 to rotate. At this time, after the second rack 204 moves upward, the liquid medicine enters the third medicine conveying pipe 401 through the first medicine conveying pipe 31, then enters the first spraying head 402 and is sprayed out of the first spraying head 402 through the first spraying openings 406. The sprayed liquid medicine is dispersed by the rotating rotating cage 403, and large droplets are broken into smaller droplets to form finer atomization.

[0041] The present application uniformly atomizes the pesticide liquid sprayed by the first pesticide spraying port 406 into small-diameter mist droplets through the rotating rotating cage 403, and with the decrease of the mist droplet diameter, the number of mist droplets increases at a geometric rate, and with the increase of the number of mist droplets, the probability of pesticide hitting the target increases significantly, and the coverage is more uniform, so that the present application has the advantages of uniform spraying and wide spraying range.

[0042] As a further explanation of the present application, see Figure 4 The second pesticide spraying device 50 comprises a fourth pesticide conveying pipe 501 fixedly connected with and communicating with the second pesticide conveying pipe 32, the fourth pesticide conveying pipe 501 is fixedly connected with the second bending rod 210, the lower end of the fourth pesticide conveying pipe 501 is fixedly connected with and communicates with one end of a spiral pipe 502, the outside of the spiral pipe 502 is sleeved with a second pesticide spraying head 503, the upper end of the second pesticide spraying head 503 is fixed on the outer wall of the second pesticide conveying pipe 32, and a plurality of second pesticide spraying ports 504 are annularly formed in the outer wall of the second pesticide spraying head 503.

[0043] Working principle: the pesticide liquid in the pesticide box 10 enters the spiral pipe 502 through the second pesticide conveying pipe 32, rotates and moves downward in a spiral line, and after flowing out of the spiral pipe 502, the water flow moves along the tangent line at the outlet of the spiral pipe 502 and is sprayed out of the plurality of second pesticide spraying ports 504 formed in the outer wall of the second pesticide spraying head 503, forming mist droplets with relatively large particle size.

[0044] The present application cooperates the spiral pipe 502 with the plurality of second pesticide spraying ports 504, so that the water flow rotates strongly in the spiral pipe 502, and when sprayed, it is converted into mist droplets with large particle size, which are easy to settle and not easy to evaporate and disperse, and are not easy to drift with the wind in windy weather, thereby ensuring the accuracy of pesticide application.

[0045] As a further explanation of the present application, see Figure 1 The inner walls of the first pesticide conveying pipe 31 and the second pesticide conveying pipe 32 are provided with a rubber layer, which can effectively fill the uneven parts and micro pores in the cooperation between the pesticide conveying pipe and the flow blocking rod 30, thereby improving the sealing between the pesticide conveying pipe and the flow blocking rod 30.

[0046] As a further explanation of the present application, see Figure 1The wind speed sensor 80 is arranged on the side wall of the medicine box 10, a signal emitting module is arranged in the wind speed sensor 80, signal emission and reception use radio communication, that is, the signal emitted by the signal emitting module can be recognized by the wireless signal receiving module of the motor 201, when the first medicine spraying device 40 sprays medicine, the wind speed sensor 80 works to monitor the wind speed in real time, if the wind speed sensor 80 detects that the wind speed in the medicine spraying environment exceeds the set threshold value, it is judged that the mist drop is not conducive to the settlement in this environment, and then a signal is sent to the motor 201 to control the motor 201 to rotate clockwise, and the second medicine spraying device 50 is switched to spray medicine, so that the present application can switch to the second medicine spraying device 50 to spray medicine in the case of sudden wind, and the effect and precision of spraying are avoided.

[0047] The method for controlling the size of the mist drop in the spraying process by using the above-mentioned mist drop size control device of the present application comprises the following steps:

[0048] ①The medicine liquid to be sprayed is added to the medicine box 10;

[0049] ②The unmanned aerial vehicle is started to fly above the area to be sprayed, and the air pump 20 and the motor 201 are started through the remote controller;

[0050] ③The operator judges that small particle size mist drop needs to be sprayed, and controls the motor 201 to rotate counterclockwise through the remote controller, and the operator judges that large particle size mist drop needs to be sprayed, and controls the motor 201 to rotate clockwise through the remote controller;

[0051] ④During the spraying process of the first medicine spraying device 40, the wind speed sensor 80 detects that the external environment is not conducive to the settlement of the mist drop, and controls the motor 201 to rotate clockwise.

[0052] Of course, the present application can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A mist droplet size control device, comprising a pesticide box (10) mounted on a plant protection unmanned aerial vehicle, a gas pump (20) and a motor (201) fixed on the pesticide box (10), characterized in that, The air pump (20) is connected and communicated with the medicine box (10), two through holes (21) are arranged on the bottom of the medicine box (10), and two flow resistance rods (30) are fixed above the two through holes (21) in the medicine box (10), the two flow resistance rods (30) are matched with the first medicine conveying pipe (31) and the second medicine conveying pipe (32) respectively, the first medicine conveying pipe (31) and the second medicine conveying pipe (32) pass through the through holes (21) and are connected and communicated with the first medicine spraying device (40) and the second medicine spraying device (50) respectively, and a switching mechanism (200) is further arranged on the medicine box (10), and the motor (201) drives the switching mechanism (200) to realize the reverse motion of the first medicine conveying pipe (31) and the second medicine conveying pipe (32) and the cooperation with the flow resistance rod (30). The switching mechanism (200) comprises a gear (202) fixed coaxially with the output shaft of the motor (201), the gear (202) is meshed with a first rack (203) and a second rack (204), the first rack (203) and the second rack (204) are fixedly connected with one end of a first sliding block (205) and a second sliding block (206) respectively, the first sliding block (205) and the second sliding block (206) are slidably connected with a first guide rail (207) and a second guide rail (208) fixed on the medicine box (10) respectively, and the other end of the first sliding block (205) and the second sliding block (206) is fixedly connected with the first medicine spraying device (40) and the second medicine spraying device (50) through a first bending rod (209) and a second bending rod (210) respectively. The first medicine spraying device (40) comprises a third medicine conveying pipe (401) connected and communicated with the first medicine conveying pipe (31) and connected with the first bending rod (209), a first medicine spraying head (402) connected and communicated with the third medicine conveying pipe (401), a rotatable rotating cage (403) arranged outside the first medicine spraying head (402), a driving fan (404) fixed coaxially with the rotating cage (403), and a fan (405) arranged on the bottom of the medicine box (10) and matched with the driving fan (404), and a plurality of first medicine spraying holes (406) are arranged in the outer wall of the first medicine spraying head (402) in a ring shape.

2. The droplet size control device of claim 1, wherein The second medicine spraying device (50) comprises a fourth medicine conveying pipe (501) connected and communicated with the second medicine conveying pipe (32) and connected with the second bending rod (210), a spiral pipe (502) connected and communicated with the fourth medicine conveying pipe (501), and a second medicine spraying head (503) sleeved outside the spiral pipe (502) and fixed with the fourth medicine conveying pipe (501); a plurality of second medicine spraying holes (504) are arranged in the outer wall of the second medicine spraying head (503) in a ring shape.

3. The droplet size control device of claim 2, wherein A storage battery (60) is fixed on the medicine box (10) and electrically connected with the air pump (20), the air pump (20) is further wirelessly connected with a remote controller, and the storage battery (60) is electrically connected with the fan (405).

4. The droplet size control device of claim 1, wherein The medicine box (10) is fixed with a bent baffle (70), the bent baffle (70) is provided with an inductive switch (71) capable of being overlapped with the second rack (204), and the inductive switch (71) is electrically connected with the fan (405).

5. The droplet size control device of claim 1, wherein The inner wall of the first medicine conveying pipe (31) and the second medicine conveying pipe (32) is provided with a rubber layer.

6. The droplet size control device of claim 1, wherein The sidewall of the medicine box (10) is provided with a wind speed sensor (80), and the wind speed sensor (80) is wirelessly connected with the motor (201).

7. The droplet size control device of claim 1, wherein The motor (201) is a stepping motor, and it is wirelessly connected with a remote controller.

8. A method of controlling the droplet size in a process of applying a medicament using the droplet size control device according to claim 1, characterized by, The method comprises the following steps: ①adding the medicine liquid to be sprayed into the medicine box (10); ②starting the unmanned aerial vehicle to fly above the area to be sprayed, and starting the air pump (20) and the motor (201) through the remote controller; ③when the operator determines that small-diameter droplets need to be sprayed, the motor (201) is controlled to rotate counterclockwise through the remote controller, and when the operator determines that large-diameter droplets need to be sprayed, the motor (201) is controlled to rotate clockwise through the remote controller; ④during the spraying process of the first medicine spraying device (40), the wind speed sensor (80) detects that the external environment is not conducive to the deposition of droplets, and the motor (201) is controlled to rotate clockwise.

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