An edible sunflower defoliant spray apparatus and method of use thereof

Abstract

This invention relates to a spraying device for defoliants on edible sunflowers and its usage method. The device includes a drone body with a liquid tank in the center. An annular plate is vertically movable along the outer wall of the drone body, and a windbreak plate is slidably connected to the side wall of the annular plate. A first spray pipe is fixedly mounted at the center of the bottom of the drone body. Second spray pipes are rotatably connected to both ends of the first spray pipe, and the other end of each second spray pipe is rotatably connected to vertical plates on both sides of the bottom of the drone body. The rotation of the second spray pipes is synchronized with the raising and lowering of the windbreak plate. Atomizing nozzles are fixedly mounted at the bottom of both the first and second spray pipes. This invention forms a vertical air curtain through the windbreak plate, providing a stable falling environment for the droplets and effectively preventing drift. The inclined spraying of the atomizing nozzles on both sides makes the liquid distribution more uniform and widens the effective coverage area, ensuring that the entire row of crops receives sufficient liquid from the center to the edge, eliminating missed spraying along the row edges, and improving the spraying effect.

Description

Technical Field

[0001] This invention relates to the technical field of sunflower mechanization, and in particular to a defoliant spraying device for edible sunflowers and its application method. Background Technology

[0002] As an important economic crop and healthy snack food, edible sunflowers are experiencing continuous growth in global and domestic market demand. With the advancement of agricultural modernization, sunflower cultivation is showing a clear trend towards large-scale and intensive development. Traditional production models that rely heavily on manual labor can no longer meet the stringent requirements of efficiency, cost, and timeliness for large-scale production. Among these, the harvesting stage has become a key bottleneck restricting the industry's development. Therefore, achieving efficient and low-loss mechanized direct harvesting (i.e., combined harvesting) is an inevitable choice for the upgrading of the sunflower industry.

[0003] The manual tray-planting and drying method involves manually cutting the sunflower heads with sickles or other tools and inserting them into the stems for a long period of natural drying. Once the moisture content of the sunflower heads and seeds has decreased, threshing is then carried out mechanically or manually. This method has fatal drawbacks, including extremely high labor intensity, very low operating efficiency, long harvesting cycle, susceptibility to weather-related mold and spoilage, and high labor costs. Building upon this technology, during the ripening period of edible sunflowers, drones are used to spray defoliants, promoting rapid dehydration of the stems, heads, and leaves in a short period. This eliminates the need for tray-planting and drying, creating optimal operating conditions for combine harvesters to complete cutting, threshing, and cleaning in one operation, significantly reducing labor costs.

[0004] When spraying defoliants using drones, the atomized agent is easily drifted by the wind, making it difficult to accurately and evenly cover the target area of ​​the plant. This can easily lead to missed spraying between rows and uneven spraying. Based on this, a defoliant spraying device for edible sunflowers and its usage method are proposed. Summary of the Invention

[0005] This invention provides a spraying device and method for applying a defoliant to edible sunflowers, which solves the problem mentioned in the above-mentioned technical background that when the agent is atomized by the nozzle and falls, it is easily drifted by the wind, making it impossible to accurately and evenly cover the target area of ​​the plant, and causing missed spraying between rows and uneven spraying.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an edible sunflower defoliant spraying device, including a drone body, a liquid tank in the middle of the drone body, an annular plate movably connected to the outer wall of the drone body, a lifting mechanism for moving the annular plate up and down on the side wall of the drone body, a wind baffle slidably connected to the side wall of the annular plate, and a driving mechanism for the wind baffle to slide along the outer wall of the annular plate on one side of the annular plate. A first spray pipe is fixedly installed in the middle of the bottom of the drone body. A second spray pipe is rotatably connected to both ends of the first spray pipe. Vertical plates are symmetrically installed on both sides of the bottom of the drone body. The other end of the second spray pipe is rotatably connected to the vertical plate. The vertical plate is provided with an angle adjustment mechanism for the rotation of the second spray pipe. The angle adjustment mechanism works synchronously with the movement of the lifting mechanism. Atomizing nozzles are fixedly installed at the bottom of both the first and second spray pipes. A liquid delivery component for pumping liquid into the first spray pipe is provided on one side of the drone body.

[0007] The lifting mechanism includes grooves formed on the outer walls of both sides of the drone body. A threaded rod is rotatably connected in the groove, and a lifting block is threadedly connected to the threaded rod. The lifting block passes through the groove and is fixedly connected to the inner wall of the annular plate.

[0008] The angle adjustment mechanism includes a vertical groove formed in the vertical plate, the second spray pipe extends through the vertical groove and is fixedly fitted with a worm gear, and a worm is rotatably connected above the vertical groove, the worm gear meshing with the worm gear.

[0009] The bottom of the threaded rod extends through into the vertical groove and is fixedly fitted with a first bevel gear. A second bevel gear is fixedly fitted on one side of the worm gear, and the first bevel gear and the second bevel gear mesh with each other.

[0010] The bottom of the drone body has a horizontal groove, and a dual-axis motor is fixedly installed in the middle of the horizontal groove. The output shaft of the dual-axis motor is fixedly connected to a rotating rod. A third bevel gear is fixedly sleeved at the end of the rotating rod. The threaded rod extends through the horizontal groove and is fixedly sleeved with a fourth bevel gear. The third bevel gear and the fourth bevel gear are meshed together.

[0011] The outer wall of the annular plate is provided with an annular groove, and an annular slider is slidably connected in the annular groove. One side of the annular slider passes through the annular groove and is fixedly connected to the wind baffle.

[0012] The driving mechanism includes a driving groove formed on one side of the annular slide, a driving motor fixedly mounted on the top of the driving groove, a rotating shaft fixedly connected to the output shaft of the driving motor, a gear fixedly mounted on the end of the rotating shaft, and a gear ring fixedly mounted on the inner wall of the annular slide, the gear meshing with the gear ring.

[0013] The top of the medicine tank is fixedly equipped with a support rod, and a wind speed and direction sensor is fixedly equipped on the top of the support rod.

[0014] A method for using a sunflower defoliant spraying device includes the following steps: Step 1: Place the prepared mixed solution containing an appropriate concentration of defoliant into the solution tank; Step 2: Activate the angle adjustment mechanism to adjust the angle of the atomizing nozzles at the bottom of the second spray pipes on both sides, so that the atomizing nozzles on both sides tilt to the same angle in different directions. At the same time, the lifting mechanism drives the baffle to move downward, so that the baffle extends to cover the droplets after the atomizing nozzles are tilted and the droplets settle from the atomizing nozzles to the bottom layer of the sunflower, thus preventing the bottom droplets from drifting without obstruction. Step 3: Based on the wind speed and direction when spraying the pesticide, start the drive mechanism to rotate the wind deflector along the ring plate on the outer wall of the drone body, so that the wind deflector moves to the optimal position for wind protection.

[0015] The beneficial effects of the edible sunflower defoliant spraying equipment and its application method of the present invention are as follows: (1) The present invention forms a vertical wind curtain by means of a wind deflector, which strongly suppresses crosswind interference and provides a stable falling environment for the droplets, preventing the sprayed liquid from drifting and being blown out of the row. At the same time, the atomizing nozzles on the first spray pipe are vertically downward and the atomizing nozzles on the second spray pipes at both ends are tilted to the sides. Under the protection of the wind deflector, the middle atomizing nozzle is responsible for the high-density area in the center, and the atomizing nozzles on both sides supplement the edge area. This not only makes the distribution of the sprayed liquid more uniform, but also widens the effective coverage width, ensuring that the entire row of crops can obtain sufficient liquid from the center to the edge, eliminating the missed spraying at the row edge. The combination of the two improves the spraying effect of the liquid.

[0016] (2) In this invention, the dual-axis motor drives the rotating rod and the third bevel gear to rotate. The third bevel gear meshes with the fourth bevel gear, and the fourth bevel gear drives the threaded rod and the first bevel gear at its bottom to rotate. The rotation of the threaded rod causes the lifting block to move the annular plate and the wind deflector on one side downward, thereby increasing the protection range of the vertical wind curtain. At the same time, the first bevel gear meshes with the second bevel gear and rotates. The second bevel gear drives the worm gear to rotate, and the worm gear meshes with the worm wheel to rotate. This causes the atomizing nozzles at the bottom of the second spray pipes on both sides to tilt in opposite directions. The lower the wind deflector is, the greater the tilt angle of the atomizing nozzles on both sides. This achieves the effect of the wind deflector moving downward, enhancing the vertical wind curtain formed by the wind deflector to suppress droplet drift. At the same time, the atomizing nozzles on both sides actively and controllably widen the effective spray width, avoiding excessive droplet aggregation caused by the strong constraint formed by the downward movement of the wind deflector, which would narrow the effective spray width and reduce the coverage area.

[0017] (3) The present invention uses wind speed and direction sensors to measure wind speed and direction, drives the motor to start and drive the shaft and gear to rotate, the gear meshes with the gear ring to rotate, the gear ring drives the ring slider and the wind deflector on one side to rotate on the ring plate, so that the wind deflector moves to the windward side and forms an arc-shaped barrier on the windward side, which specifically blocks the dominant wind direction, while guiding the airflow to flow smoothly, reducing the lateral thrust on the fog droplets, and effectively reducing the drift of the fog droplets. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle; Figure 4 This is a side view of the lifting mechanism on the side wall of the UAV body and the angle adjustment mechanism inside the vertical plate of the present invention. Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 6 This is a top view schematic diagram of the connection structure between the UAV body and the annular plate, and between the annular plate and the windshield plate of the present invention. Figure 7 For the present invention Figure 6 Enlarged view of point D; Figure 8 This is a top view of the second spray pipes on both sides of the first spray pipe after the angle has been adjusted according to the present invention. Figure 9 This is a schematic diagram of the overall front view of the present invention.

[0019] In the diagram: 1. UAV body, 2. Liquid tank, 3. Annular plate, 4. Wind deflector, 5. First spray pipe, 6. Second spray pipe, 7. Vertical plate, 8. Atomizing nozzle, 9. Groove, 10. Threaded rod, 11. Lifting block, 12. Vertical groove, 13. Worm gear, 14. Worm, 15. First bevel gear, 16. Second bevel gear, 17. Horizontal groove, 18. Dual-axis motor, 19. Rotating rod, 20. Third bevel gear, 21. Fourth bevel gear, 22. Annular groove, 23. Annular slider, 24. Drive groove, 25. Drive motor, 26. Shaft, 27. Gear, 28. Gear ring, 29. Support rod, 30. Wind speed and direction sensor. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figure 1-9As shown, an edible sunflower defoliant spraying device includes a drone body 1, a liquid tank 2 in the middle of the drone body 1, a receiving groove in the middle of the top of the drone body 1, the liquid tank 2 being disposed in the receiving groove, an annular plate 3 being movably connected to the outer wall of the drone body 1, a lifting mechanism for the annular plate 3 to move up and down on the side wall of the drone body 1, a wind deflector 4 being slidably connected to the side wall of the annular plate 3, and a driving mechanism for the wind deflector 4 to slide along the outer wall of the annular plate 3 on one side of the annular plate 3. A first spray pipe 5 is fixedly installed in the middle of the bottom of the drone body 1. A second spray pipe 6 is rotatably connected to both ends of the first spray pipe 5. Vertical plates 7 are symmetrically installed on both sides of the bottom of the drone body 1. The other end of the second spray pipe 6 is rotatably connected to the vertical plate 7. The vertical plate 7 is provided with an angle adjustment mechanism for the rotation of the second spray pipe 6. The angle adjustment mechanism works synchronously with the movement of the lifting mechanism. Atomizing nozzles 8 are fixedly installed at the bottom of both the first spray pipe 5 and the second spray pipe 6. A liquid delivery assembly for pumping liquid into the first spray pipe 5 is provided on one side of the drone body 1. The first spray pipe 5 and the second spray pipe 6 are connected. The liquid delivery assembly includes a water pump whose inlet end is fixedly installed on one side of the drone body 1 and extends through to the bottom side of the liquid tank 2. A liquid delivery hose is fixedly connected to the outlet end of the water pump. The liquid delivery hose is fixedly connected to the top of the first spray pipe 5.

[0022] The lifting mechanism includes grooves 9 formed on the outer walls of both sides of the UAV body 1. A threaded rod 10 is rotatably connected in the groove 9. A lifting block 11 is threadedly connected to the threaded rod 10. The lifting block 11 passes through the groove 9 and is fixedly connected to the inner wall of the annular plate 3. By rotating the threaded rods 10 on both sides, the lifting block 11 moves up and down synchronously, thereby driving the annular plate 3 and the wind deflector 4 on one side to move up and down.

[0023] The angle adjustment mechanism includes a vertical groove 12 formed in the vertical plate 7, the second spray pipe 6 extends through the vertical groove 12 and is fixedly fitted with a worm gear 13, and a worm 14 is rotatably connected above the vertical groove 12, the worm 14 and the worm gear 13 are meshed together.

[0024] The worm gear 14 meshes with the worm wheel 13, causing the worm wheel 13 to rotate. This rotation of the worm wheel 13 then adjusts the angle of the atomizing nozzle 8 at the bottom of the second spray pipe 6. The rapid rotation of the worm gear 14 converts into a slow, precise rotation of the worm wheel 13, which in turn drives the second spray pipe 6. This allows for a slow and accurate adjustment of the angle of the atomizing nozzle 8 at the bottom of the second spray pipe 6, avoiding excessively fast adjustment speeds and excessively large angles. The "worm gear driven, worm wheel driven" structure of the worm gear has a reverse self-locking property, ensuring that once the angles of the atomizing nozzles 8 on both sides are adjusted to the correct position, the angles will not shift on their own even when affected by drone vibration, crosswind impact, or droplet recoil. Furthermore, its compact structure and small axial dimensions make it suitable for the limited space of drones.

[0025] The bottom of the threaded rod 10 extends through into the vertical groove 12 and is fixedly fitted with a first bevel gear 15. A second bevel gear 16 is fixedly fitted on one side of the worm gear 14. The first bevel gear 15 and the second bevel gear 16 are meshed and connected.

[0026] While the threaded rod 10 rotates, its bottom first bevel gear 15 meshes with the second bevel gear 16, which rotates. The second bevel gear 16 drives the worm gear 14 to rotate, thereby achieving synchronous adjustment of the nozzle at the bottom of the second spray pipe 6 and the raising and lowering of the wind deflector 4. This makes the wind deflector lower, and the tilt angle of the atomizing nozzles on both sides greater. This achieves the effect of the wind deflector moving downward, enhancing the vertical wind curtain formed by the wind deflector 4 to suppress droplet drift. At the same time, the atomizing nozzles 8 on both sides actively and controllably widen the effective spray width, avoiding excessive droplet aggregation caused by the strong constraint formed by the downward movement of the wind deflector 4, which would narrow the effective spray width and reduce the coverage area. The downward movement of the wind deflector 4 and the synchronous adjustment of the atomizing nozzles 8 on both sides also allow the wind deflector 4 to cover the complete path of the adjusted droplets from the nozzle to the front, back, middle and lower parts, matching the oblique droplet path and improving the anti-drift effect.

[0027] The bottom of the UAV body 1 has a horizontal groove 17. A dual-axis motor 18 is fixedly installed in the middle of the horizontal groove 17. The output shaft of the dual-axis motor 18 is fixedly connected to a rotating rod 19. A third bevel gear 20 is fixedly sleeved at the end of the rotating rod 19. The threaded rod 10 extends through into the horizontal groove 17 and is fixedly sleeved with a fourth bevel gear 21. The third bevel gear 20 and the fourth bevel gear 21 are meshed and connected.

[0028] The dual-axis motor 18 drives the rotating rods 19 on both sides to rotate in opposite directions. The teeth of the third bevel gear 20 at the end of the rotating rod 19 are in opposite directions. Therefore, the threads of the threaded rods 10 on both sides are set in opposite directions. When the threaded rods 10 on both sides rotate in opposite directions, the lifting blocks 11 on both sides can move up and down synchronously. The threaded rods 10 on both sides rotate in opposite directions, so that the worm gears 14 on both sides drive the worm wheel 13 to rotate in opposite directions. This causes the atomizing nozzles at the bottom of the second spray pipes 6 at both ends to tilt in different directions on both sides. The middle atomizing nozzle 8 is responsible for the high-density area in the center, and the atomizing nozzles 8 on both sides supplement the edge area. This not only makes the sprayed liquid distribution more uniform, but also widens the effective coverage width, ensuring that the entire row of crops can get enough liquid from the center to the edge, eliminating row edge spraying, and allowing the droplets to be continuously and evenly distributed in the flight direction, so that the defoliant can be sprayed evenly on the sunflower.

[0029] The central bottom atomizing nozzle 8 uses an air-induced type (such as TeeJet AI 12004) to cover key targets such as flower discs, with a slightly larger flow rate to ensure coverage. The two side atomizing nozzles 8 use narrow-angle anti-drift nozzles (such as TeeJet TTI 9502), with a smaller flow rate to avoid wasting drug.

[0030] The outer wall of the annular plate 3 is provided with an annular groove 22, and an annular slider 23 is slidably connected in the annular groove 22. One side of the annular slider 23 passes through the annular groove 22 and is fixedly connected to the wind baffle 4. The cross-sections of the annular groove 22 and the annular slider 23 are arranged in a T-shape to ensure the stability of the wind baffle 4 when the annular slider 23 drives the wind baffle 4 to move on the side wall of the annular plate 3.

[0031] The driving mechanism includes a driving groove 24 formed on one side of the annular slide 22. A driving motor 25 is fixedly mounted on the top of the driving groove 24. The output shaft of the driving motor 25 is fixedly connected to a rotating shaft 26. A gear 27 is fixedly sleeved on the end of the rotating shaft 26. A gear ring 28 is fixedly mounted on the inner wall of the annular slider 23. The gear 27 meshes with the gear ring 28. The driving motor 25 drives the rotating shaft 26 and the gear 27 to rotate. The gear 27 meshes with the gear ring 28 to rotate. The gear ring 28 drives the annular slider 23 and the wind deflector 4 on one side to rotate on the annular plate 3. The position of the wind deflector 4 is adjusted so that the wind deflector moves to the windward side, forming an arc-shaped barrier on the windward side to specifically block the dominant wind direction, while guiding the airflow to flow smoothly, reducing the lateral thrust on the fog droplets, and effectively reducing the drift of the fog droplets.

[0032] The top of the medicine tank 2 is fixedly equipped with a support rod 29, and the top of the support rod 29 is fixedly equipped with a wind speed and direction sensor 30. The wind speed and direction sensor 30 is electrically connected to the drive motor 25. By measuring the wind speed and direction through the wind speed and direction sensor 30, the wind deflector 4 can be moved accurately and quickly to the windward side.

[0033] A method for using a sunflower defoliant spraying device includes the following steps: Step 1: Based on the required number of acres of sunflower field to be sprayed, prepare the defoliant solution by adding 200 ml of 40% ethephon and 150-200 ml of 37.4% diquat per acre of sunflower field, along with 2.5 L of water. Place the prepared defoliant solution in the solution tank 2, start the water pump, and pump the solution from the solution tank 2 into the first spray pipe 5. The solution then flows from the first spray pipe 5 into the second spray pipes 6 on both sides, and is then atomized and sprayed out through the atomizing nozzles 8. Step 2: Start the lifting mechanism to move the wind deflector 4 downwards. At the same time, the angle adjustment mechanism adjusts the angle of the atomizing nozzles 8 at the bottom of the second spray pipes 6 on both sides, so that the atomizing nozzles 8 on both sides tilt to the same angle in different directions, so that the wind deflector 4 extends synchronously to cover the droplets after the atomizing nozzles 8 are tilted from the atomizing nozzles 8 to the settling path of the sunflower, avoiding the bottom droplets from drifting without obstruction. The dual-axis motor 18 is started, driving the rotating rod 19 and the third bevel gear 20 to rotate. The third bevel gear 20 meshes with the fourth bevel gear 21, which in turn drives the threaded rod 10 and the first bevel gear 15 at its bottom to rotate. The first bevel gear 15 meshes with the second bevel gear 16, which in turn drives the worm gear 14 to rotate. The worm gear 14 meshes with the worm wheel 13, which in turn drives the atomizing nozzles 8 at the bottom of the second spray pipes 6 on both sides to rotate in opposite directions. This causes the atomizing nozzles 8 on both sides to tilt to both sides, so that the middle atomizing nozzle 8 is responsible for the central high-density area, while the atomizing nozzles 8 on both sides supplement the central area. The edge area is filled, which not only makes the sprayed liquid distribution more uniform, but also widens the effective coverage width, ensuring that the entire row of crops can receive sufficient liquid from the center to the edge, eliminating row edge spraying, and allowing the droplets to be continuously and evenly distributed in the flight direction, so that the defoliant can be sprayed evenly on the sunflower. At the same time, the rotation of the threaded rod 10 causes the lifting block 11 to drive the ring plate 3 and the wind deflector 4 on one side to move downward in sync, enhancing the vertical wind curtain formed by the wind deflector 4, expanding and extending it to the middle and lower area, covering the complete path of the droplets from the nozzle to the front and rear middle and lower parts, matching the oblique droplet path, and further improving the anti-drift effect.

[0034] Step 3: Based on the wind speed and direction when spraying the pesticide, start the drive mechanism to drive the wind deflector 4 to rotate along the annular plate 3 on the outer wall of the drone body 1, so that the wind deflector 4 moves to the optimal position for wind protection.

[0035] Based on the wind speed and direction measurements by the wind speed and direction sensor 30, the drive motor 25 starts, driving the rotating shaft 26 and gear 27 to rotate. The gear 27 meshes with the gear ring 28 to rotate, and the gear ring 28 drives the annular slider 23 and the wind deflector 4 on one side to rotate on the annular plate 3, causing the wind deflector 4 to move to the windward side and form an arc-shaped barrier on the windward side, specifically blocking the dominant wind direction, while guiding the airflow to flow smoothly, reducing the lateral thrust on the fog droplets, and effectively reducing the drift of the fog droplets.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spraying device for defoliant application on edible sunflowers, comprising a drone body, characterized in that: The drone body has a medicine tank in the middle, and an annular plate is movably connected to the outer wall of the drone body. The side wall of the drone body is provided with a lifting mechanism for the annular plate to move up and down. A wind deflector is slidably connected to the side wall of the annular plate, and a driving mechanism for the wind deflector to slide along the outer wall of the annular plate is provided on one side of the annular plate. A first spray pipe is fixedly installed in the middle of the bottom of the drone body. A second spray pipe is rotatably connected to both ends of the first spray pipe. Vertical plates are symmetrically installed on both sides of the bottom of the drone body. The other end of the second spray pipe is rotatably connected to the vertical plate. The vertical plate is provided with an angle adjustment mechanism for the rotation of the second spray pipe. The angle adjustment mechanism works synchronously with the movement of the lifting mechanism. Atomizing nozzles are fixedly installed at the bottom of both the first and second spray pipes. A liquid delivery component for pumping liquid into the first spray pipe is provided on one side of the drone body.

2. The sunflower defoliant spraying equipment according to claim 1, characterized in that: The lifting mechanism includes grooves formed on the outer walls of both sides of the drone body. A threaded rod is rotatably connected in the groove, and a lifting block is threadedly connected to the threaded rod. The lifting block passes through the groove and is fixedly connected to the inner wall of the annular plate.

3. The sunflower defoliant spraying equipment according to claim 2, characterized in that: The angle adjustment mechanism includes a vertical groove formed in the vertical plate, the second spray pipe extends through the vertical groove and is fixedly fitted with a worm gear, and a worm is rotatably connected above the vertical groove, the worm gear meshing with the worm gear.

4. The sunflower defoliant spraying equipment according to claim 3, characterized in that: The bottom of the threaded rod extends through into the vertical groove and is fixedly fitted with a first bevel gear. A second bevel gear is fixedly fitted on one side of the worm gear, and the first bevel gear and the second bevel gear mesh with each other.

5. The sunflower defoliant spraying equipment according to claim 4, characterized in that: The bottom of the drone body has a horizontal groove, and a dual-axis motor is fixedly installed in the middle of the horizontal groove. The output shaft of the dual-axis motor is fixedly connected to a rotating rod. A third bevel gear is fixedly sleeved at the end of the rotating rod. The threaded rod extends through the horizontal groove and is fixedly sleeved with a fourth bevel gear. The third bevel gear and the fourth bevel gear are meshed together.

6. The sunflower defoliant spraying equipment according to claim 1, characterized in that: The outer wall of the annular plate is provided with an annular groove, and an annular slider is slidably connected in the annular groove. One side of the annular slider passes through the annular groove and is fixedly connected to the wind baffle.

7. The sunflower defoliant spraying equipment according to claim 6, characterized in that: The driving mechanism includes a driving groove formed on one side of the annular slide, a driving motor fixedly mounted on the top of the driving groove, a rotating shaft fixedly connected to the output shaft of the driving motor, a gear fixedly mounted on the end of the rotating shaft, and a gear ring fixedly mounted on the inner wall of the annular slide, the gear meshing with the gear ring.

8. The sunflower defoliant spraying equipment according to claim 6, characterized in that: The top of the medicine tank is fixedly equipped with a support rod, and a wind speed and direction sensor is fixedly equipped on the top of the support rod.

9. A method of using a defoliant spraying device for edible sunflowers, based on the defoliant spraying device for edible sunflowers according to any one of claims 1 to 8, characterized in that: Includes the following steps: Step 1: Place the prepared mixed solution containing an appropriate concentration of defoliant into the solution tank; Step 2: Activate the angle adjustment mechanism to adjust the angle of the atomizing nozzles at the bottom of the second spray pipes on both sides, so that the atomizing nozzles on both sides tilt to the same angle in different directions. At the same time, the lifting mechanism drives the baffle to move downward, so that the baffle extends to cover the droplets after the atomizing nozzles are tilted and the droplets settle from the atomizing nozzles to the bottom layer of the sunflower, thus preventing the bottom droplets from drifting without obstruction. Step 3: Based on the wind speed and direction when spraying the pesticide, start the drive mechanism to rotate the wind deflector along the ring plate on the outer wall of the drone body, so that the wind deflector moves to the optimal position for wind protection.

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