Aerial pesticide spraying unmanned aerial vehicle

Abstract

The application provides a pesticide spraying unmanned aerial vehicle, and particularly relates to the technical field of unmanned aerial vehicles, which comprises a UAV main body, the bottom of the UAV main body is fixedly connected with a bottom plate, the bottom of the bottom plate is detachably connected with a pesticide liquid tank, the bottoms of two side plates away from the UAV main body are both fixedly installed with electric telescopic rods, the telescopic ends of the electric telescopic rods are moved downward to reduce the spraying height of the fan-shaped nozzles, so that the flying height of the whole aerial vehicle does not need to be adjusted in actual spraying operation, the stability of the aerial vehicle is not affected by the adjustment of the flying height, the spraying height of the four fan-shaped nozzles arranged right below the four driving motors is flexibly reduced, the downward airflow generated when the flying wing rotates is better utilized, the pesticide liquid is pushed to the surface of the plants by the downward airflow, the penetration of the pesticide liquid to the crops is enhanced, the deposition effect of the pesticide liquid is improved, and the spraying effect of the unmanned aerial vehicle pesticide spraying is improved.

Description

Technical Field

[0001] This invention provides a pesticide spraying drone, specifically relating to the field of drone technology. Background Technology

[0002] Spraying drones, also known as pesticide spraying unmanned aerial vehicles, are widely used in agricultural production for agricultural spraying. They are equipped with devices that automatically spray pesticides, and users can control the drone to spray pesticides automatically through a remote control system.

[0003] The invention patent with authorization announcement number CN107200130B discloses an intelligent pesticide spraying aircraft and method. This intelligent pesticide spraying aircraft combines image processing technology with drone technology and uses a camera to detect and identify objects below the aircraft. It can not only monitor the growth of crops, but also achieve intelligent spraying, that is, it will only spray pesticides when there are crops below the aircraft. Implementing intelligent spraying can not only reduce the amount of pesticides used, but also reduce environmental pollution.

[0004] However, this intelligent pesticide spraying drone has the following shortcomings in actual use: During outdoor spraying operations, crosswinds are generated. To reduce the impact of crosswinds on the spraying effect, existing technologies lower the drone's flight altitude to indirectly reduce the spraying height. However, adjusting the drone's altitude involves many unstable factors. This not only affects the drone's flight stability, but if the drone directly adjusts its altitude to ensure spraying effectiveness, excessively low altitude can cause the large downdraft from the wings to excessively sweep the plants, causing them to tilt and preventing the pesticide from being sprayed directly onto them. Furthermore, the unstable downdraft also affects the uniformity of pesticide spraying. Therefore, the aforementioned pesticide spraying drone lacks the function of flexibly adjusting the spraying height, resulting in poor spraying effects during actual operations and hindering the plants from obtaining the optimal efficacy of the pesticide.

[0005] Therefore, this invention proposes a pesticide spraying unmanned aerial vehicle to compensate for and improve the shortcomings of the prior art. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a spraying drone that can effectively solve the related technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention discloses a pesticide spraying unmanned aerial vehicle (UAV), comprising a UAV body. Four Y-shaped rods are uniformly fixedly arranged on the outer surface of the UAV body. Two drive motors are fixedly arranged at the ends of the four Y-shaped rods away from the UAV body. A base plate is fixedly connected to the bottom of the UAV body. A pesticide tank is detachably connected to the bottom of the base plate. A water pump is fixedly arranged on the top surface of the pesticide tank. An inlet pipe is connected to the water inlet end of the water pump and is connected to the inside of the pesticide tank. Two supply pipes are connected to the water outlet end of the water pump. Fan-shaped nozzles are connected at the ends of the two supply pipes away from the water pump. A total of four fan-shaped nozzles are arranged, and a horizontal pipe is connected between two fan-shaped nozzles. All four fan-shaped nozzles are located directly below the corresponding drive motors. Active adjustment mechanisms are symmetrically arranged on both sides of the UAV body.

[0009] The active adjustment mechanism includes two side plates symmetrically fixedly connected to the outer walls of both sides of the drone body. An electric telescopic rod is fixedly installed at the bottom of the two side plates at the end away from the drone body. A fixed plate is fixedly connected to the lower telescopic end of each of the two electric telescopic rods. A frame plate is fixedly connected to the outer ring surface of each of the two fixed plates. Two rectangular slots are respectively opened on the side of each of the two frame plates away from the fixed plate. Two strip rods are slidably connected to each of the two rectangular slots. A vertical rod is fixedly connected to the lower end of the two strip rods. The lower end of the vertical rod is detachably connected to the top of the fan-shaped nozzle.

[0010] Preferably, the top surface of the medicine tank is provided with four positioning holes evenly distributed, and a positioning plate is fixedly provided on the bottom surface of the base plate at the position corresponding to the four positioning holes. The positioning plate and the positioning holes are connected by screw threads.

[0011] Preferably, two limiting plates are symmetrically arranged at the part where the strip bar slides into the rectangular groove, and the two limiting plates are respectively attached to the upper and lower outer walls of the frame plate.

[0012] Preferably, the lower end of the plumb rod has an external thread on its outer wall, and the top of the fan-shaped nozzle has an internal thread hole. The fan-shaped nozzle is threadedly connected to the external thread at the lower end of the plumb rod through the internal thread hole.

[0013] Preferably, the two fixed plates are symmetrically provided with a matching displacement mechanism on the side away from the drone body. The matching displacement mechanism includes a displacement plate fixedly connected to the outer wall of the fixed plate on the side away from the drone body. A threaded rod is fixedly connected to the top of the displacement plate at the end away from the fixed plate. A grooved plate is fixedly connected to the outer wall of the electric telescopic rod on the side near the displacement plate. A synchronous wheel is rotatably connected to the end of the grooved plate away from the electric telescopic rod. The grooved plate has a through hole at the position corresponding to the threaded rod for the threaded rod to pass through vertically. The center of the threaded rod and the center of the synchronous wheel constitute a ball screw structure. Initially, the lower end of the threaded rod passes through the center of the synchronous wheel. The bottom center of the two drive motors is rotatably connected to a synchronous wheel. A synchronous belt is connected between the synchronous wheel and the synchronous wheel. A toothed ring is fixedly provided on the bottom outer ring surface of the synchronous wheel. A toothed plate is fixedly connected to the top outer wall of the vertical rod corresponding to the synchronous wheel. The toothed ring and the toothed plate mesh with each other.

[0014] Preferably, the grooved plate has a rectangular hole through which the displacement plate can be vertically displaced.

[0015] Preferably, the length of the threaded rod is equal to the extension length of the extension end of the electric telescopic rod.

[0016] Preferably, the toothed plate consists of a plate body and a plurality of teeth evenly arranged on the surface of the plate body near the toothed ring, and the length of each tooth is equal to the distance of the vertical displacement of the threaded rod.

[0017] Compared with the known prior art, the technical solution provided by this invention has the following beneficial effects:

[0018] This unmanned aerial vehicle (UAV) for spraying pesticides uses an electrically operated telescopic boom. By extending the boom downwards, the spraying height of the fan-shaped nozzles is reduced. This eliminates the need to adjust the overall flight altitude of the UAV during actual spraying operations, avoiding any impact on flight stability. By flexibly lowering the spraying height of the four fan-shaped nozzles located directly below the four drive motors, the UAV can better utilize the downward airflow generated by the rotating wings to push the pesticide solution onto the plant surface, enhancing the penetration of the pesticide into the crop and improving the deposition effect, thereby improving the spraying efficiency of the UAV.

[0019] The telescopic end of the electric telescopic rod can drive four fan-shaped nozzles to freely adjust the spraying height of the four fan-shaped nozzles according to the height of different plants during the actual spraying operation. This not only improves the flexibility and adaptability of the spraying operation, but also allows for better spraying of pesticides onto the plants.

[0020] As the four fan-shaped nozzles lower their spray height, the horizontal distance between two fan-shaped nozzles can be automatically adjusted by the cooperation of components such as toothed rings and toothed plates. This increases the distance between the two fan-shaped nozzles after they lower their height, thereby increasing the coverage area when the fan-shaped nozzles spray the pesticide. This not only ensures a stable spraying effect of the fan-shaped nozzles, but also improves the spraying effect of the pesticide and increases spraying efficiency. Attached Figure Description

[0021] Figure 1 This is a front-view perspective view of the present invention.

[0022] Figure 2 This is a partial three-dimensional structural diagram of the relevant components of the medicine tank and water pump of the present invention;

[0023] Figure 3 This is a partial three-dimensional structural diagram of the side plate and related components of the electric telescopic rod of the present invention;

[0024] Figure 4 This is a partial three-dimensional structural diagram of the relevant components at the frame plate of the present invention;

[0025] Figure 5 This is a partial three-dimensional structural diagram of the relevant components at the bar section of the present invention;

[0026] Figure 6 This is a partial three-dimensional structural diagram of the relevant components at the displacement plate of the present invention;

[0027] Figure 7 This is a partial three-dimensional structural diagram of two related components of the synchronous pulley of the present invention;

[0028] Figure 8 This is a partial three-dimensional structural diagram of the relevant components at the synchronization belt of the present invention;

[0029] Figure 9 This is a partial cross-sectional three-dimensional structural view of the connection between the grooved plate and the synchronous pulley of the present invention.

[0030] The labels in the diagram represent:

[0031] 1. Drone body; 11. Y-shaped rod; 12. Drive motor; 13. Base plate; 14. Liquid tank; 15. Water pump; 16. Liquid supply pipe; 17. Fan-shaped nozzle; 171. Horizontal pipe;

[0032] Active adjustment mechanism: 21. Side plate; 22. Electric telescopic rod; 221. Fixed plate; 23. Frame plate; 24. Rectangular groove; 25. Strip rod; 26. Vertical rod;

[0033] Matching displacement mechanism: 31. Displacement plate; 32. Threaded rod; 33. Grooved plate; 34. Synchronous pulley one; 35. Synchronous pulley two; 36. Synchronous belt; 37. Gear ring; 38. Toothed plate. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments.

[0035] Example 1: As Figure 1 , Figure 2 As shown, a pesticide spraying drone includes a drone body 1, which has a built-in control system and a monitoring sensor for monitoring plant height. Four Y-shaped rods 11 are evenly fixed on the outer surface of the drone body 1. Two drive motors 12 are fixedly mounted at the ends of the four Y-shaped rods 11 furthest from the drone body 1. There are at least eight drive motors 12 in total, and flight wings are fixedly mounted on the top output shafts of each of the eight drive motors 12. A base plate 13 is fixedly connected to the bottom of the drone body 1. A pesticide tank 14 is detachably connected to the bottom of the base plate 13. The pesticide tank 14 is used to hold the sprayed pesticide solution, and a filling port with a sealing plug is provided on the top surface of the pesticide tank 14. The top surface of the liquid medicine tank 14 is evenly provided with four positioning holes. The bottom surface of the base plate 13 is fixedly provided with positioning plates at the positions corresponding to the four positioning holes. The positioning plates and positioning holes are connected by screw threads. When in use, the user can remove the four screws by turning them to separate the liquid medicine tank 14 from the base plate 13 so that the user can replace or clean the liquid medicine tank 14. A water pump 15 is fixedly installed on the top surface of the medicine tank 14. A water inlet pipe is connected to the water inlet end of the water pump 15 and is connected to the inside of the medicine tank 14. Two supply pipes 16 are connected to the water outlet end of the water pump 15. A fan-shaped nozzle 17 is connected to the end of each of the two supply pipes 16 away from the water pump 15. There are a total of four fan-shaped nozzles 17. A horizontal pipe 171 is connected between two fan-shaped nozzles 17. The four fan-shaped nozzles 17 are all located directly below the corresponding drive motors 12. Specifically, the corresponding fan-shaped nozzles 17 are located directly below four of the eight drive motors 12. The supply pipes 16 are flexible hoses.

[0036] In use: The user first opens the sealing plug on the liquid tank 14, pours the prepared spray solution into the tank 14, and seals the sealing plug with the filling port after the solution is full. Then, the user can control the eight drive motors 12 to start simultaneously through the external control system, driving the flight wings to rotate and fly the drone body 1 and all its components to the area where the liquid solution needs to be sprayed. Upon arrival at the spraying area, the user controls the water pump 15 to start. The water pump 15 draws the liquid solution from the liquid tank 14 through the inlet pipe, and under the pressure of the water pump 15, the liquid solution is sent through the two supply pipes 16 to the corresponding two fan-shaped nozzles 17, thereby causing the four fan-shaped nozzles 17 to spray the liquid solution onto the plants. This achieves unmanned aerial spraying of the plants, avoiding the low spraying efficiency of manual spraying and improving the spraying effect.

[0037] As an improvement, such as Figure 1 , Figures 3 to 5 As shown, active adjustment mechanisms are symmetrically arranged on both sides of the drone body 1. The active adjustment mechanism includes two side plates 21 symmetrically fixedly connected to the outer walls of both sides of the drone body 1. Electric telescopic rods 22 are fixedly installed at the bottom of the two side plates 21 away from the drone body 1. Fixed plates 221 are fixedly connected to the lower telescopic ends of the two electric telescopic rods 22. Frame plates 23 are fixedly connected to the outer ring surfaces of the two fixed plates 221. Two rectangular slots 24 are respectively opened on the side of the two frame plates 23 away from the fixed plates 221. Two strip rods 25 are slidably connected to the two rectangular slots 24. Two limiting plates are symmetrically arranged at the parts where the strip rods 25 slide with the rectangular slots 24. The two limiting plates are respectively attached to the upper and lower outer walls of the frame plates 23 so that the strip rods 25 can only move horizontally within the rectangular slots 24. The lower ends of the two bar-shaped rods 25 are fixedly connected to a plumb line 26. The lower end of the plumb line 26 has an external thread on its outer wall, and the top of the fan-shaped nozzle 17 has an internal thread hole. The fan-shaped nozzle 17 is threadedly connected to the external thread at the lower end of the plumb line 26 through the internal thread hole. The lower end of the plumb line 26 and the top of the fan-shaped nozzle 17 are detachably connected.

[0038] In use: Furthermore, considering that the pesticide sprayed from the fan-shaped nozzles 17 may be affected by crosswinds during actual spraying, leading to uneven spraying, existing technologies generally reduce the spraying height by lowering the flight altitude to reduce the impact of crosswinds. However, during the spraying operation of this unmanned aerial vehicle (UAV), the height of the plants in the spraying area is monitored by sensors on the UAV body 1. The spraying height of the fan-shaped nozzles 17 is adjusted accordingly to achieve the best spraying effect. When adjusting the spraying height of the fan-shaped nozzles 17, it is not necessary to adjust the overall flight altitude of the UAV. While maintaining a stable altitude, the extension ends of the two electric telescopic rods 22 can be extended downwards via an external controller. This causes the fixed plate 221 and frame plate 23 to move downwards synchronously. The frame plate 23, rectangular groove 24, and strip rod 25 then drive the vertical rods 26 to move downwards synchronously, thus achieving synchronous downward movement of the four vertical rods 26 and the corresponding four fan-shaped nozzles 17. Once the device has moved downwards to the desired height, the external controller can be used to keep the telescopic end of the electric telescopic rod 22 in its current position. Therefore, by using the electric telescopic rod 22 to move downwards, the spraying height of the fan-shaped nozzles 17 is reduced. This eliminates the need to adjust the overall flight altitude of the aircraft during actual spraying operations, avoiding any impact on flight stability. This flexibly lowers the spraying height of the four fan-shaped nozzles 17 located directly below the four drive motors 12, allowing for better utilization of the downward airflow generated by the rotating wings. This downward airflow pushes the pesticide onto the plant surface, enhancing the pesticide's penetration into the crop and improving its deposition, thereby improving the overall spraying effect of unmanned aerial spraying.

[0039] Meanwhile, the telescopic end of the electric telescopic rod 22 can drive the four fan-shaped nozzles 17 to freely adjust the spraying height of the four fan-shaped nozzles 17 according to the height of different plants during the actual spraying operation. This not only improves the flexibility and adaptability of the spraying operation, but also allows for better spraying of pesticides onto the plants.

[0040] Example 2: Figure 1 , Figures 6 to 9As shown, the aforementioned spraying drone also includes a cooperating displacement mechanism symmetrically arranged on the side of the two fixed plates 221 away from the drone body 1. The cooperating displacement mechanism includes a displacement plate 31 fixedly connected to the outer wall of the side of the fixed plate 221 away from the drone body 1. A threaded rod 32 is fixedly connected to the top of the end of the displacement plate 31 away from the fixed plate 221. The length of the threaded rod 32 is equal to the extension length of the telescopic end of the electric telescopic rod 22. That is, when the extension end of the electric telescopic rod 22 extends downward to its maximum length, the threaded rod 32 also moves to its maximum distance. A grooved plate 33 is fixedly connected to the outer wall of the electric telescopic rod 22 near the displacement plate 31. The grooved plate 33 is fixed to the outer wall of the fixed end of the electric telescopic rod 22. A rectangular hole is provided on the grooved plate 33 for the displacement plate 31 to pass through during vertical displacement. A first synchronous wheel 34 is rotatably connected to the end of the grooved plate 33 away from the electric telescopic rod 22. The grooved plate 33 has a through hole at the position corresponding to the threaded rod 32 for the threaded rod 32 to pass through vertically. The center of the threaded rod 32 and the first synchronous wheel 34 forms a ball screw structure. Initially, the lower end of the threaded rod 32 passes through the center of the first synchronous wheel 34. The bottom center of the two drive motors 12 is rotatably connected to a second synchronous wheel 35. Specifically, there are two second synchronous wheels 35, and the two second synchronous wheels 35 rotate at the bottom center of the corresponding drive motor 12. A synchronous belt 36 is connected between the adjacent synchronous pulley 25 and synchronous pulley 1 34. A toothed ring 37 is fixedly installed on the bottom outer ring surface of synchronous pulley 25. A toothed plate 38 is fixedly connected to the top outer wall of the vertical rod 26 corresponding to synchronous pulley 25. The toothed plate 38 is composed of a plate body and multiple long teeth evenly arranged on the surface of the plate body near the toothed ring 37. The length of each long tooth is equal to the vertical displacement distance of the threaded rod 32. Initially, the toothed ring 37 is engaged with the bottom of the multiple long teeth. That is to say, when the threaded rod 32 moves down to the final position, the long teeth on the toothed plate 38 are still engaged with the toothed ring 37. And as the toothed plate 38 moves down with the vertical rod 26, the long teeth are always engaged with the toothed ring 37.

[0041] In use: To enhance the spraying effect of the four fan-shaped nozzles 17 on the plants, in the above embodiment one, when the telescopic end of the electric telescopic rod 22 drives the fixed plate 221 to move downward, it also drives the two displacement plates 31 and the two threaded rods 32 to move downward synchronously. As the two threaded rods 32 move downward, they will drive the corresponding synchronous wheel 34 to rotate counterclockwise. Note: The direction of rotation can be referenced. Figure 6As shown, with the rotation of the first synchronous pulley 34, the second synchronous pulley 35 and the gear ring 37 are driven to rotate synchronously via the synchronous belt 36. As the gear ring 37 rotates counterclockwise, the toothed plate 38, under the limiting action of the rectangular groove 24, gradually moves horizontally away from the main body of the drone 1, thereby driving the corresponding fan-shaped nozzle 17 to move horizontally synchronously. After the fan-shaped nozzle 17 moves horizontally, it will drive another fan-shaped nozzle 17 to move synchronously via the horizontal tube 171. In this way, the two fan-shaped nozzles 17 located on the same side of the horizontal tube 171 can both move horizontally away from the main body of the drone 1, that is, the two fan-shaped nozzles 17 move horizontally away from each other. When the telescopic end of the electric telescopic rod 22 moves upward, it will drive the first synchronous pulley 34 to rotate in the opposite direction via the threaded rod 32, thereby driving the toothed plate 38 and the two fan-shaped nozzles 17 to move horizontally towards each other via the gear ring 37. Therefore, as the four fan-shaped nozzles 17 lower their spray height, the horizontal distance between two fan-shaped nozzles 17 can be automatically adjusted through the cooperation of components such as the toothed ring 37 and toothed plate 38. This increases the distance between the two fan-shaped nozzles 17 after they lower their height, thereby increasing the coverage area when spraying the pesticide. This not only ensures a stable spraying effect of the fan-shaped nozzles 17 but also improves the spraying efficiency. Furthermore, the adjustment of the horizontal distance between two of the four fan-shaped nozzles 17 can be coordinated and adapted to the adjustment of their vertical height, further enhancing the flexibility of the spraying operation.

[0042] As a supplement: during the process of the threaded rod 32 moving up and down to drive the synchronous wheel 34 to rotate in both directions, and finally adjusting the horizontal distance between two of the four fan-shaped nozzles 17, the four fan-shaped nozzles 17 are always within the range of the downward airflow generated when the flying wing on the drive motor 12 rotates, so as to ensure that when the fan-shaped nozzles 17 spray the liquid, they can always be assisted by the downward airflow of the flying wing.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pesticide spraying unmanned aerial vehicle, comprising a drone body (1), characterized in that, Four Y-shaped rods (11) are uniformly fixed on the outer surface of the drone body (1). Two drive motors (12) are fixedly installed at the ends of the four Y-shaped rods (11) away from the drone body (1). A base plate (13) is fixedly connected to the bottom of the drone body (1). A medicine tank (14) is detachably connected to the bottom of the base plate (13). A water pump (15) is fixedly installed on the top surface of the medicine tank (14). A water inlet pipe is connected to the water inlet end of the water pump (15), and the water inlet pipe is connected to the medicine. The interior of the box (14) is connected, and two liquid supply pipes (16) are connected to the water outlet of the water pump (15). The two liquid supply pipes (16) are connected to a fan-shaped nozzle (17) at the end away from the water pump (15). There are four fan-shaped nozzles (17) in total, and a horizontal pipe (171) is connected between two fan-shaped nozzles (17). The four fan-shaped nozzles (17) are located directly below the corresponding drive motor (12). Active adjustment mechanisms are symmetrically arranged on both sides of the main body of the UAV (1). The active adjustment mechanism includes two side plates (21) symmetrically fixedly connected to the outer walls of both sides of the drone body (1). Electric telescopic rods (22) are fixedly installed at the bottom of the two side plates (21) away from the drone body (1). Fixed plates (221) are fixedly connected to the lower telescopic ends of the two electric telescopic rods (22). Frame plates (23) are fixedly connected to the outer ring surfaces of the two fixed plates (221). Two rectangular slots (24) are respectively opened on the side of the two frame plates (23) away from the fixed plates (221). Two strip rods (25) are slidably connected to the two rectangular slots (24). A vertical rod (26) is fixedly connected to the lower end of the two strip rods (25). The lower end of the vertical rod (26) is detachably connected to the top of the fan-shaped nozzle (17). Two fixed plates (221) are symmetrically provided with a matching displacement mechanism on the side away from the UAV body (1). The matching displacement mechanism includes a displacement plate (31) fixedly connected to the outer wall of the side of the fixed plate (221) away from the UAV body (1). A threaded rod (32) is fixedly connected to the top of the end of the displacement plate (31) away from the fixed plate (221). A grooved plate (33) is fixedly connected to the outer wall of the electric telescopic rod (22) near the displacement plate (31). A synchronous wheel (34) is rotatably connected to the end of the grooved plate (33) away from the electric telescopic rod (22). The grooved plate (33) is provided with a threaded rod (32) at the position corresponding to the threaded rod (32). 2) A through hole that passes vertically through the threaded rod (32) and the center of the first synchronous wheel (34) form a ball screw structure. Initially, the lower end of the threaded rod (32) passes through the center of the first synchronous wheel (34). The bottom center of the two drive motors (12) is rotatably connected to the second synchronous wheel (35). The second synchronous wheel (35) and the first synchronous wheel (34) are connected by a synchronous belt (36). A toothed ring (37) is fixedly provided on the bottom outer ring surface of the second synchronous wheel (35). A toothed plate (38) is fixedly connected to the top outer wall of the vertical rod (26) corresponding to the second synchronous wheel (35). The toothed ring (37) and the toothed plate (38) mesh with each other. Two limiting plates are symmetrically arranged on the part where the strip rod (25) and the rectangular groove (24) slide together, and the two limiting plates are respectively attached to the upper and lower outer walls of the frame plate (23).

2. The spraying drone according to claim 1, characterized in that, The top surface of the liquid tank (14) is provided with four positioning holes evenly distributed. The bottom surface of the base plate (13) is fixedly provided with a positioning plate at the position corresponding to the four positioning holes. The positioning plate and the positioning holes are connected by screw threads.

3. The spraying drone according to claim 1, characterized in that, The lower end of the vertical rod (26) has an external thread on its outer wall, and the top of the fan-shaped nozzle (17) has an internal thread hole. The fan-shaped nozzle (17) is threadedly connected to the lower end of the vertical rod (26) through the internal thread hole.

4. The spraying drone according to claim 1, characterized in that, The grooved plate (33) has a rectangular hole through which the displacement plate (31) passes for vertical displacement.

5. The pesticide spraying unmanned aerial vehicle according to claim 1, characterized in that, The length of the threaded rod (32) is equal to the extension length of the extension end of the electric telescopic rod (22).

6. The spraying drone according to claim 1, characterized in that, The toothed plate (38) consists of a plate body and a plurality of teeth evenly arranged on the surface of the plate body near the toothed ring (37), and the length of each tooth is equal to the distance of the vertical displacement of the threaded rod (32).

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