Agricultural plant protection unmanned aerial vehicle

Abstract

The invention discloses an agricultural plant protection unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicles. The agricultural plant protection unmanned aerial vehicle comprises a vehicle body provided with supporting legs and further comprises wings, the multiple wings are circumferentially and evenly arranged on the vehicle body, the tail end of each wing is provided with a fan blade driven by a motor, and the side, away from the fan blade, of each wing is provided with a nozzle; the water tank is arranged on the lower side of the machine body, and a feeding assembly for supplying water to the nozzles is arranged on the water tank; the anti-shaking assembly is arranged in the water tank and used for restraining water in the water tank from shaking; the movable floating plate capable of moving up and down along with the liquid level is attached to the liquid level all the time, the elastic element is used for buffering, shaking of liquid in flight is effectively restrained, and flight stability is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) technology, and more particularly to an agricultural plant protection UAV. Background Technology

[0002] Agricultural drones, as the name suggests, are unmanned aerial vehicles used for the protection of agricultural and forestry plants. These drones consist of three parts: a flight platform (fixed-wing, helicopter, or multi-rotor aircraft), a navigation and flight control system, and a spraying mechanism. They are used for spraying operations via ground remote control or navigation and flight control. They can spray pesticides, seeds, powders, etc., without the need for a dedicated take-off and landing airport. The downward airflow generated by the rotor helps increase the penetration of the mist into crops, resulting in high control efficacy. Remote control operation over long distances avoids the danger of pesticide exposure for spraying personnel, improving the safety of spraying operations, among many other advantages.

[0003] However, existing agricultural drones have problems during use. When the water tank is being used for spraying, as the liquid inside decreases, the liquid in the tank shakes during the drone's flight, which can easily lead to flight instability and even the risk of crashing. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose an agricultural plant protection drone.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An agricultural plant protection drone includes a body equipped with outriggers, and also includes:

[0007] The aircraft has multiple wings that are evenly distributed around the fuselage. Each wing has a fan blade driven by a motor at its end, and each wing has a nozzle on the side facing away from the fan blade.

[0008] A water tank is located on the lower side of the machine body, and a feeding assembly for supplying water to the nozzle is provided on the water tank;

[0009] And an anti-sloshing component, which is installed inside the water tank to suppress water sloshing within the tank.

[0010] Preferably, the feeding assembly includes a pump body fixed to the bottom of the water tank, a water guide pipe connected to the pump body outlet, a central pipe disposed on the water tank, and an infusion hose connecting the central pipe to each of the nozzles.

[0011] Preferably, the bottom of the water tank is provided with a conical groove at the pump body, a filter screen is fixed on the conical groove, a water inlet communicating with the pump body inlet is provided at the bottom center of the conical groove, the side wall of the conical groove is inclined at an angle of 30°-60°, and the shape of the filter screen matches the inner wall of the conical groove and covers the entire inner surface of the conical groove.

[0012] Preferably, the central tube includes a rotating tube rotatably connected to the water tank and rotating joints disposed at both ends of the rotating tube, with the two rotating joints respectively connected to the upper and lower sides of the water tank.

[0013] Preferably, the anti-sway assembly includes an inverted U-shaped rod slidably connected to the water tank, a movable float plate disposed at one end of the inverted U-shaped rod, and an elastic element sleeved on the inverted U-shaped rod and connected at both ends to the inner wall of the top of the water tank and the top wall of the movable float plate, respectively. The movable float plate is provided with a flexible sealing ring on its outer side that moves against the inner wall of the water tank.

[0014] The inverted U-shaped rod includes a first rod body, a second rod body, and a connecting rod for connecting the first rod body and the second rod body, and the elastic element is sleeved on the first rod body.

[0015] Preferably, the movable float plate has a recessed hole for the movement of the rotating tube, and the upper and lower sides of the inner wall of the recessed hole are provided with lip-shaped sealing rings that abut against the movement of the rotating tube.

[0016] Preferably, the bottom outer wall of the rotating tube is provided with a plurality of paddles evenly arranged in a circle, the paddles are inclined and their bottoms move against the bottom inner wall of the water tank, the outer wall of the rotating tube is provided with a spiral guide groove along its axial direction, and a fixing block is fixedly provided on the inner wall of the concave hole and slides with the spiral guide groove.

[0017] Preferably, the top of the water tank is fixed with an elastic telescopic rod by a support plate, and a limiting plate is fixed at the end of the elastic telescopic rod. The top of the limiting plate away from the elastic telescopic rod has a pressing slope, and the first rod body has a plurality of positioning grooves along its axial direction that cooperate with the limiting plate.

[0018] Preferably, the second rod body has a scale line for displaying the liquid level inside the water tank, the top of the water tank has a water inlet, a telescopic tube is provided between the water inlet and the movable float, and the bottom opening of the telescopic tube is connected to the cavity formed by the inner wall of the water tank and the movable float for containing water.

[0019] Preferably, the outer wall of the water tank is provided with a sliding groove, a counterweight is slidably connected in the sliding groove, a pull rope is fixed on the counterweight, and the end of the pull rope away from the counterweight passes through an elastic telescopic rod and is connected to a limiting plate.

[0020] Compared with the prior art, the present invention provides an agricultural plant protection drone, which has the following beneficial effects:

[0021] 1. This agricultural plant protection drone, through a combination of a movable float, a flexible sealing ring, and elastic elements, ensures that during spraying, the float remains firmly attached to the descending liquid surface under its own weight and elastic force, transforming the large free liquid surface in the water tank into a constrained and controlled small liquid surface. This design fundamentally changes the dynamic characteristics of the liquid, greatly reducing the liquid sloshing and surging effects caused by the drone's maneuvering flight (such as turning, ascending, and hovering). The reduction in liquid sloshing inertia directly translates into a reduction in attitude disturbance to the flight platform, making the drone's flight more stable and its control response more precise. It effectively avoids the risks of fuselage imbalance, spray path deviation, or even crashes caused by violent liquid sloshing in traditional plant protection drones, significantly improving flight safety and operational reliability in complex working environments.

[0022] 2. When the float of this agricultural plant protection drone moves down with the liquid level, the fixed block in its concave hole moves along the spiral guide groove on the outside of the rotating tube, forcibly converting the linear downward motion of the float into the rotational motion of the rotating tube. Through the inclined paddle at its bottom, it continuously and gently stirs and lifts the pesticide sediment accumulated at the bottom of the water tank, causing it to re-mix into the pesticide solution. This process is completely passively triggered, requiring no additional sensors or electronic control drive. The stirring intensity and spraying progress are naturally synchronized. In addition to the sway suppression function, it also provides automatic anti-sedimentation and anti-pesticide stratification and agglomeration effects, ensuring the uniformity of the sprayed pesticide concentration, thereby improving the pest and disease control effect and reducing the risk of pipeline blockage due to sediment.

[0023] 3. This agricultural plant protection drone features a flexibly adjustable limiting plate. When the float moves downwards normally, the limiting plate can be easily pushed open. When liquid attempts to rise and push up the float due to sloshing, the limiting plate engages in the positioning groove, preventing the float and the liquid below from flowing back and locking the water in its current position. This enhances the sloshing suppression effect. Especially when the drone makes sudden stops or turns, it can instantly lock the liquid surface, preventing the accumulation of sloshing energy. This forms a dual guarantee of adaptive sloshing suppression and rigid locking, further consolidating flight stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a cross-sectional structural diagram of the water tank of the present invention;

[0026] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0027] Figure 4 for Figure 2 Enlarged structural diagram of section B;

[0028] Figure 5 for Figure 2 Enlarged structural diagram of section C;

[0029] Figure 6 This is a schematic diagram of the inverted U-shaped rod of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the central tube of the present invention.

[0031] In the diagram: 1. Airframe; 101. Outrigger; 2. Wing; 201. Fan blade; 202. Nozzle; 3. Water tank; 301. Conical groove; 3011. Filter screen; 4. Pump body; 401. Water guide pipe; 402. Central pipe; 4021. Rotating pipe; 4022. Rotating joint; 5. U-shaped rod; 501. First rod body; 5011. Positioning groove; 502. Second rod body; 5021. Scale line; 503. Connecting rod; 6. Moving float; 601. Elastic element; 602. Flexible sealing ring; 7. Concave hole; 701. Lip sealing ring; 8. Elastic telescopic rod; 801. Limiting plate; 9. Water inlet; 901. Telescopic pipe; 10. Paddle; 11. Spiral guide groove; 111. Fixing block; 12. Slide groove; 121. Counterweight block; 122. Pull rope. Detailed Implementation

[0032] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figures 1 to 3 As shown, this embodiment proposes an agricultural plant protection drone, including a body 1 equipped with outriggers 101, and further including:

[0036] The wing 2 has multiple wings that are evenly arranged in a circle on the fuselage 1. Each wing 2 has a fan blade 201 driven by a motor at its end. The drone can take off, hover, translate and turn by controlling the speed of each motor. Each wing 2 has a nozzle 202 on the side away from the fan blade 201.

[0037] Water tank 3 is located on the lower side of the machine body 1, and a feeding assembly for supplying water to the nozzle 202 is provided on the water tank 3.

[0038] And an anti-sloshing component, which is installed inside the water tank 3 to suppress the sloshing of water in the water tank 3;

[0039] Specifically, the operator issues commands via remote control to control the motors at the ends of each wing 2 to drive the fan blades 201 to rotate, generating lift to take off and fly to the target work area. During this process, regardless of whether the drone is accelerating, decelerating, turning, or encountering turbulent airflow, its internal anti-sway component continues to work, physically constraining and consuming the kinetic energy of the liquid to suppress violent shaking. After the drone reaches the predetermined position, the feeding component is activated. This component draws liquid from the water tank 3 and delivers it through internal pipelines to each nozzle 202. The nozzles 202 atomize the liquid and spray it onto the crops below. Throughout the spraying process, the anti-sway component continuously... It functions to ensure that even under dynamic conditions such as continuously decreasing pesticide volume, changes in the center of gravity of the liquid, and continuous flight of the drone, the sloshing of the liquid in tank 3 is always kept at a low level. After the operation is completed, the feeding component is turned off, and the drone flies back to the take-off and landing point and lands smoothly. The built-in anti-sloshing component significantly reduces liquid sloshing from the source, making the drone's attitude more stable and controllable during flight, especially when making maneuvers such as turning and taking off and landing. It effectively avoids the risk of unbalanced body, spray path deviation, or even crash caused by violent sloshing of pesticide liquid in traditional agricultural drones, and significantly improves flight safety and operational reliability in complex working environments.

[0040] like Figure 1 , Figure 2 and Figure 7 As shown, in a preferred embodiment, based on the above method, the feeding assembly further includes a pump body 4 fixed at the bottom of the water tank 3, a water guide pipe 401 connected to the outlet of the pump body 4, a central pipe 402 set on the water tank 3, and a liquid delivery hose connecting the central pipe 402 to each nozzle 202.

[0041] Furthermore, a conical groove 301 is provided at the bottom of the water tank 3 at the pump body 4, and a filter screen 3011 is fixed on the conical groove 301. A water inlet communicating with the inlet of the pump body 4 is provided at the bottom center of the conical groove 301. The side wall of the conical groove 301 is inclined at an angle of 30°-60°, and the shape of the filter screen 3011 matches the inner wall of the conical groove 301 and covers the entire inner surface of the conical groove 301.

[0042] Furthermore, the central tube 402 includes a rotating tube 4021 rotatably connected to the water tank 3 and rotating joints 4022 disposed at both ends of the rotating tube 4021. The two rotating joints 4022 are respectively connected to the upper and lower sides of the water tank 3.

[0043] Specifically, when the drone enters the spraying operation mode, the feeding component is activated, and the pump body 4 starts working. The operation of the pump body 4 generates negative pressure, drawing the pesticide solution from the conical groove 301 at the bottom of the water tank 3 through the suction port connected to its inlet. The pesticide solution from various parts of the water tank 3 converges into the conical groove 301 under the action of gravity. Before flowing through the suction port, the pesticide solution must pass through the filter screen 3011 covering the entire inner wall of the conical groove 301. The filter screen 3011 intercepts any particulate impurities, undissolved pesticide clumps, or other suspended matter that may be present in the pesticide solution outside the conical groove 301, thus completing the filtration before entering the pump body 4. The filtered clean pesticide solution... After being pressurized by the pump body 4, the liquid is pumped out from its outlet and transported to the central tube 402 through the water guide pipe 401. The liquid enters the interior of the rotating tube 4021 of the central tube 402 and the passage is kept sealed by the rotating joints 4022 at both ends. Subsequently, the liquid flows out from the upper part of the rotating tube 4021 and enters each infusion hose connected to it. Each infusion hose independently delivers the liquid to the nozzle 202 under the corresponding wing 2. Finally, the nozzle 202 atomizes and sprays it out to complete the spraying operation. During this process, the rotating tube 4021 of the central tube 402 can rotate freely, but whether it rotates or not does not affect its core function as a fluid channel.

[0044] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in a preferred embodiment, based on the above method, the anti-sway component further includes an inverted U-shaped rod 5 slidably connected to the water tank 3, a movable float 6 disposed at one end of the inverted U-shaped rod 5, and an elastic element 601 sleeved on the inverted U-shaped rod 5 and connected at both ends to the inner wall of the top of the water tank 3 and the top wall of the movable float 6, respectively. A flexible sealing ring 602 is provided on the outer side of the movable float 6 to move against the inner wall of the water tank 3.

[0045] The inverted U-shaped rod 5 includes a first rod body 501, a second rod body 502, and a connecting rod 503 for connecting the first rod body 501 and the second rod body 502. An elastic element 601 is sleeved on the first rod body 501.

[0046] Furthermore, the movable float plate 6 is provided with a recessed hole 7 for the movement of the rotating tube 4021, and the upper and lower sides of the inner wall of the recessed hole 7 are provided with lip-shaped sealing rings 701 that abut against the movement of the rotating tube 4021.

[0047] Furthermore, the second rod 502 is provided with a scale line 5021 for displaying the liquid level inside the water tank 3, and the top of the water tank 3 is provided with a water inlet 9. A telescopic tube 901 is provided between the water inlet 9 and the movable float 6. The bottom opening of the telescopic tube 901 is connected to the cavity formed by the inner wall of the water tank 3 and the movable float 6 for containing water.

[0048] Specifically, before operation, the chemical solution is added to the water tank 3 through the water inlet 9. The chemical solution flows directly into the sealed cavity below the movable float 6 through the telescopic pipe 901. As the amount of chemical solution in the lower cavity increases, the movable float 6 begins to rise under the action of buoyancy, overcoming the pressure of the elastic element 601. The movable float 6 drives the entire assembly to rise vertically synchronously through the inverted U-shaped rod 5. At this time, the position of the second rod 502 relative to the water tank 3 is raised, and the scale line 5021 on it indicates the current liquid storage volume. The elastic element 601 is compressed and stores energy. After the spraying begins, the pump body 4 draws liquid from the bottom of the water tank 3, reducing the total liquid volume below the movable float 6 and weakening the buoyancy. Under the combined action of the movable float 6's own weight and the restoring elastic force released by the elastic element 601, the buoyancy is reduced. As the mobile float 6 is pushed downwards, the flexible sealing ring 602 allows it to slide down close to the inner wall of the water tank 3 and remain pressed against the liquid surface below. The lip-shaped sealing ring 701 in the recessed hole 7 allows the rotating tube 4021 to pass freely without interfering with the up-and-down movement of the float. Throughout the spraying process, the mobile float 6 continuously tracks the downward movement of the liquid surface, greatly limiting the space and amplitude of liquid sloshing. By actively following and pressing down on the liquid surface with a float that can move up and down, the large area of ​​free liquid surface that is prone to sloshing is physically constrained within the limited space below the float, fundamentally changing the dynamic characteristics of the liquid. This can extremely effectively suppress liquid surges and sloshing caused by the maneuvering flight of the UAV, and significantly improve flight attitude stability.

[0049] like Figure 2 , Figure 5 and Figure 7 As shown, in a preferred embodiment, based on the above method, further, a plurality of paddles 10 are evenly arranged on the bottom outer wall of the rotating tube 4021. The paddles 10 are inclined and their bottoms move against the bottom inner wall of the water tank 3. A spiral guide groove 11 is opened on the outer wall of the rotating tube 4021 along its axial direction. A fixing block 111 that slides with the spiral guide groove 11 is fixedly arranged on the inner wall of the concave hole 7.

[0050] Specifically, the movable float 6 moves up and down accordingly with the rise and fall of the liquid level in the water tank 3. At this time, the fixed block 111 in the recess 7 moves up and down along with the float. Since the fixed block 111 is slidably fitted in the spiral guide groove 11 of the rotating tube 4021, when the fixed block 111 is forced to move up and down in a straight line, it cannot disengage from the spiral groove. The up and down movement of the fixed block 111 will inevitably generate a force on the side wall of the spiral groove of the rotating tube 4021. The tangential component of this force will force the rotating tube 4021 to rotate around its own axis. When the movable float 6 moves down, the rotating tube 4021 rotates in one direction. The rotation of the rotating tube 4021... This will directly drive all the paddles 10 fixed at its bottom to rotate together. Since the paddles 10 are set at an angle, when they rotate, they will generate an upward and tangential combined thrust on the liquid in the bottom area of ​​the water tank 3. The rotating paddles 10 can also disturb, lift and sweep away the insoluble matter or flocculent matter that has settled at the bottom of the tank. This can effectively break the sediment layer that is easy to form when the liquid is left to stand, and prevent insoluble powder, wettable powder or other components from hardening at the bottom of the tank. At the same time, the stirring action can promote the mixing of liquids of different concentrations or temperatures in the tank, maintain the uniformity of the liquid composition, and ensure that the concentration of the sprayed liquid is consistent from the beginning to the end of the operation, thus ensuring the prevention and control effect.

[0051] like Figure 2 and Figure 3 As shown, in a preferred embodiment, based on the above method, the top of the water tank 3 is further provided with an elastic telescopic rod 8 fixed by a support plate, and a limiting plate 801 is fixed at the end of the elastic telescopic rod 8. A pressing slope is opened at the top of the end of the limiting plate 801 away from the elastic telescopic rod 8, and a plurality of positioning grooves 5011 that cooperate with the limiting plate 801 are opened along its axial direction of the first rod body 501.

[0052] Specifically, in the uncompressed state, the elastic telescopic rod 8 is in an extended state, and the free end of the limiting plate 801 is engaged in the positioning groove 5011 of the first rod body 501, restricting the upward movement of the first rod body 501. When the anti-sway component moves downward due to spraying operations, the first rod body 501 descends accordingly. During the descent, the outer surface of the first rod body 501 contacts the pressing inclined surface of the free end of the limiting plate 801. Due to the inclined surface, the force exerted by the first rod body 501 on the limiting plate 801 generates a horizontal component force. This component force pushes the limiting plate 801 to one side, allowing the first rod body 501 to pass smoothly without being stuck. When the anti-sway component attempts to move upward under the influence of factors such as liquid sloshing, the first... When the rod 501 has an upward tendency, if the free end of the limiting plate 801 is aligned with the opening of a positioning groove 5011, then at the moment the first rod 501 moves slightly upward, the limiting plate 801 will quickly spring back under the restoring force of the elastic telescopic rod 8, causing its free end to be locked into the positioning groove 5011. Once locked, the upward movement of the first rod 501 is mechanically blocked, thereby locking the position of the entire anti-sway component. It can mechanically prevent the upward rebound caused by the impact of liquid sloshing, which is the second strong guarantee to suppress sloshing. Structurally, it eliminates the separation of the float from the liquid surface, ensures the continuous pressure of the float on the liquid surface, thereby greatly enhancing the ability to resist violent sloshing and improving flight stability.

[0053] like Figure 2 and Figure 3 As shown, in a preferred embodiment, based on the above method, the outer wall of the water tank 3 is further provided with a groove 12, a counterweight 121 is slidably connected in the groove 12, a pull rope 122 is fixed on the counterweight 121, and the end of the pull rope 122 away from the counterweight 121 passes through the elastic telescopic rod 8 and is connected to the limiting plate 801.

[0054] Specifically, when the drone body 1, carrying the water tank 3, moves rapidly downwards and lands, the liquid inside the water tank 3 tends to maintain its original state of motion due to inertia. Therefore, relative to the rapidly descending water tank 3, the liquid exhibits an upward surging tendency, that is, the liquid attempts to rush towards the top of the water tank 3. However, the locked float plate is located above the liquid. At this time, the upward impact force of the liquid will act on the lower surface of the float plate, attempting to push the float plate upwards. When the drone body 1 descends and lands, the counterweight block 121 slides in the slide groove 12 under the action of inertia. The counterweight block 121 pulls the limiting plate 801 through the pull rope 122, so that the limiting plate 801 no longer restricts the upward movement of the inverted U rod 5. When the liquid violently impacts the moving float plate 6 during the impact, the moving float plate 6 moves upwards and compresses the elastic element 601, buffering the impact force of the liquid and avoiding structural bursting or weld cracking that may be caused by a sudden increase in internal pressure of the water tank 3.

[0055] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An agricultural plant protection drone, comprising a body (1) equipped with outriggers (101), characterized in that, Also includes: Wings (2), the wings (2) are provided in multiple and are evenly arranged on the body (1) in a circular pattern. Each wing (2) is provided with a fan blade (201) driven by a motor at its end. Each wing (2) is provided with a nozzle (202) on the side away from the fan blade (201). Water tank (3), the water tank (3) is located on the lower side of the machine body (1), and the water tank (3) is provided with a feeding assembly that supplies water to the nozzle (202); And an anti-sway component, which is installed inside the water tank (3) to suppress the swaying of the water inside the water tank (3).

2. An agricultural plant protection drone according to claim 1, characterized in that, The feeding assembly includes a pump body (4) fixed at the bottom of the water tank (3), a water guide pipe (401) connected to the outlet of the pump body (4), a central pipe (402) set on the water tank (3), and a delivery hose connecting the central pipe (402) to each of the nozzles (202).

3. An agricultural plant protection drone according to claim 2, characterized in that... The bottom of the water tank (3) is provided with a conical groove (301) at the pump body (4). A filter screen (3011) is fixed on the conical groove (301). The bottom center of the conical groove (301) is provided with a water inlet that communicates with the inlet of the pump body (4). The side wall of the conical groove (301) is inclined at an angle of 30°-60°. The shape of the filter screen (3011) matches the inner wall of the conical groove (301) and covers the entire inner surface of the conical groove (301).

4. An agricultural plant protection drone according to claim 3, characterized in that, The central tube (402) includes a rotating tube (4021) rotatably connected to the water tank (3) and rotating joints (4022) at both ends of the rotating tube (4021). The two rotating joints (4022) are respectively connected to the upper and lower sides of the water tank (3).

5. An agricultural plant protection drone according to claim 4, characterized in that, The anti-sway assembly includes an inverted U-shaped rod (5) slidably connected to the water tank (3), a movable float (6) set at one end of the inverted U-shaped rod (5), and an elastic element (601) sleeved on the inverted U-shaped rod (5) and connected at both ends to the inner wall of the top of the water tank (3) and the top wall of the movable float (6) respectively. A flexible sealing ring (602) is provided on the outside of the movable float (6) to move against the inner wall of the water tank (3). The inverted U-shaped rod (5) includes a first rod body (501), a second rod body (502), and a connecting rod (503) for connecting the first rod body (501) and the second rod body (502). The elastic element (601) is sleeved on the first rod body (501).

6. An agricultural plant protection drone according to claim 5, characterized in that, The movable float (6) has a recessed hole (7) for the movement of the rotating tube (4021). The upper and lower sides of the inner wall of the recessed hole (7) are provided with lip-shaped sealing rings (701) that abut against the movement of the rotating tube (4021).

7. An agricultural plant protection drone according to claim 6, characterized in that, The bottom outer wall of the rotating tube (4021) is uniformly provided with several paddles (10) in a circular pattern. The paddles (10) are inclined and their bottoms move against the bottom inner wall of the water tank (3). The outer wall of the rotating tube (4021) is provided with a spiral guide groove (11) along its axial direction. The inner wall of the concave hole (7) is fixedly provided with a fixing block (111) that slides with the spiral guide groove (11).

8. An agricultural plant protection drone according to claim 7, characterized in that, The top of the water tank (3) is fixed with an elastic telescopic rod (8) by a support plate. The end of the elastic telescopic rod (8) is fixed with a limiting plate (801). The top of the limiting plate (801) away from the elastic telescopic rod (8) is provided with a pressing slope. The first rod body (501) is provided with a plurality of positioning grooves (5011) along its axial direction that cooperate with the limiting plate (801).

9. An agricultural plant protection drone according to claim 8, characterized in that, The second rod (502) has a scale line (5021) for displaying the liquid level inside the water tank (3). The top of the water tank (3) has a water inlet (9). A telescopic pipe (901) is provided between the water inlet (9) and the movable float (6). The bottom opening of the telescopic pipe (901) is connected to the cavity formed by the inner wall of the water tank (3) and the movable float (6) for containing water.

10. An agricultural plant protection drone according to claim 9, characterized in that, The outer wall of the water tank (3) is provided with a groove (12), and a counterweight (121) is slidably connected in the groove (12). A pull rope (122) is fixed on the counterweight (121). The end of the pull rope (122) away from the counterweight (121) passes through the elastic telescopic rod (8) and is connected to the limiting plate (801).

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