Environment-friendly agricultural plant protection unmanned aerial vehicle

Abstract

The invention belongs to the field of intelligent agricultural mechanical equipment, and provides an environment-friendly agricultural plant protection unmanned aerial vehicle which comprises an unmanned aerial vehicle body, the unmanned aerial vehicle body is provided with a water tank, a water pump and a plurality of nozzles, the water tank is used for supplying water to the nozzles, and the water tank is provided with a water adding pipe opening and a water outlet pipe opening. Two flow stabilizing columns distributed at intervals are arranged in the water tank, each flow stabilizing column is of a hollow structure, a supporting assembly is arranged in the center of each flow stabilizing column, variable-capacity floating clothes made of elastic materials are arranged on the outer side of each supporting assembly, the adjacent positions of the two variable-capacity floating clothes are connected with each other, and a control assembly is arranged in each supporting assembly. The power output side of the control assembly is provided with a flexible connecting assembly which is in transmission connection with the control assembly and connected with the variable-capacity floating clothes, and the control assembly controls the volume of the variable-capacity floating clothes to change by retracting and releasing the flexible connecting assembly. The unmanned aerial vehicle is reasonable in design, capable of reducing the gravity center change amplitude, beneficial to improving the plant protection operation performance and suitable for large-scale popularization.

Description

Technical Field

[0001] The present invention belongs to the field of smart agricultural machinery and equipment, relates to unmanned aerial vehicles (UAVs), and in particular to an environmentally friendly agricultural plant protection UAV. Background Art

[0002] Plant protection drones are unmanned aircraft used for agricultural and forestry plant protection operations. They primarily use ground-based remote control or GPS flight control to spray pesticides, seeds, and powders. Integrating multiple advanced technologies, these drones possess intelligent flight control and operational capabilities. Using GPS positioning and flight control systems, they automatically fly according to preset routes and parameters, precisely spraying pesticides and applying fertilizers to farmland. This eliminates the need for direct human control, significantly improving accuracy and efficiency, and embodying the automation and precision inherent in smart agriculture.

[0003] What makes plant protection drones different from other drones for project execution is that they need to carry water tanks and atomizing nozzles during operation. Generally speaking, the water tanks used are injection-molded water tanks, and their interior is basically used to store water, such as the quick-detachable dual spraying system and its control system for multi-rotor plant protection drones disclosed in existing patent CN208875191U, and an agricultural plant protection drone disclosed in CN214356645U. However, since the drone is in a flying posture during the operation with the water tank, and as the amount of water gradually decreases, the sloshing of the water in the water tank increases, and the center of gravity changes in multiple directions increases, it will increase the difficulty of controlling the balance of the drone. Summary of the Invention

[0004] In response to the technical problems existing in the above-mentioned UAV during water-carrying flight operations, the present invention proposes an environmentally friendly agricultural plant protection UAV with a reasonable design that can reduce the amplitude of center of gravity variation and is conducive to improving the UAV's plant protection operation performance.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides an environmentally friendly agricultural plant protection drone, including a drone body, the drone body is provided with a water tank, a water pump and multiple nozzles, the water tank is used to supply water to the nozzles, the water tank is provided with a water inlet and a water outlet, the interior of the water tank is provided with two spaced-apart flow stabilizing columns, the flow stabilizing columns are hollow structures and a support assembly is provided at the center thereof, the outside of the support assembly is provided with a variable-volume float made of elastic material, the adjacent positions of the two variable-volume floats are connected to each other, the interior of the support assembly is provided with a control assembly, the power output side of the control assembly is provided with a flexible connection assembly that is transmission-connected to it and connected to the variable-volume float, and the control assembly controls the volume change of the variable-volume float by retracting and extending the flexible connection assembly.

[0006] Preferably, the variable-volume floating garment includes an upper garment part. The unfolded shape of the upper garment part is frustum-shaped, and the edges of the frustum are connected by arc parts. Side garment parts are provided on the arc parts, and the side garment parts extend towards the corner positions of the water tank. The top end of the upper garment part is fixedly connected to the neck position of the support assembly. A lower garment part is provided at the bottom of the upper garment part. A tubular opening is provided at the center of the lower garment part, and a movable ring is provided at the edge of the tubular opening. The movable ring is used to reciprocate along the axial directions of the support assembly and the flow-stabilizing column.

[0007] Preferably, the cross-section of the side garment part is in a V-shape and its bottom is connected to the arc part. Telescopic water garments are provided on the adjacent surfaces of two variable-volume floating garments. The outer surface of the telescopic water garment after unfolding is in a saddle shape.

[0008] Preferably, a circle of elastic ropes is provided at the connection position between the upper garment part and the lower garment part, and a threading tube for inserting and matching with the elastic ropes is provided at the bottom edge of the arc part.

[0009] Preferably, the flexible connection assembly includes two first tightening ropes and two second tightening ropes. The first tightening ropes are led out from the bottom of the variable-volume floating garment and extend along the surface of the variable-volume floating garment. The ends of the first tightening ropes are in transmission connection with the control assembly. The control assembly reduces the volume of the variable-volume floating garment by taking in and releasing the first tightening ropes. The second tightening ropes are led out from the bottom of the variable-volume floating garment and extend along the circumferential direction of the side garment part. A plurality of supporting members that support and cooperate with the second tightening ropes and are fixedly connected to the water tank are provided on the transmission side of the second tightening ropes. The ends of the second tightening ropes are in transmission connection with the control assembly. The control assembly expands the volume of the variable-volume floating garment by taking in and releasing the second tightening ropes.

[0010] Preferably, the control assembly includes two threaded transmission rods. A micro-motor is provided at the power input section of the threaded transmission rods. The threaded surface of one threaded transmission rod is in spiral cooperation with the two first tightening ropes, and the threaded surface of the other threaded transmission rod is in spiral cooperation with the two second tightening ropes.

[0011] Preferably, the plurality of supporting members include 2 side supporting members and 1 bottom supporting member. The side supporting members are provided on the side of the water tank and are distributed in a staggered manner up and down. The bottom supporting member is provided at the bottom of the water tank.

[0012] Preferably, the side supporting member includes a supporting column. A threading hole is provided at the center of the supporting column. A roller is provided on the side of the supporting column. A first annular surface for cooperating with the second tightening rope is provided on the roller.

[0013] Preferably, the bottom supporting member includes an upper supporting ball and a lower supporting ball. Second annular surfaces and third annular surfaces are respectively provided on the upper supporting ball and the lower supporting ball. The second annular surface and the third annular surface are cross-connected. The bottom of the lower supporting ball is fixedly connected to the water tank.

[0014] Preferably, the support assembly includes a T-shaped support tube, which is nested with the flow stabilizing column. The top of the support tube is provided with a U-shaped opening for passing through the flexible connection assembly, and the top of the support tube is provided with a sealing cover.

[0015] Preferably, the bottom of the water tank is provided with a pair of installation grooves corresponding to the flow stabilizing columns, and the bottom of the installation grooves is provided with a counterweight bottom support.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0017] An environment-friendly agricultural plant protection unmanned aerial vehicle provided by the present invention can block the path of the surging water in the water tank by adopting the flow stabilizing column and reduce the surging amplitude; the variable-volume floating coat can expand from flat to drum-shaped to fill the space where the water in the water tank is lost, compress the activity space of the water, thereby restricting the activity amplitude of the water in the water tank, and further reducing the change amplitude of the center of gravity, which is beneficial to reducing the control difficulty of the unmanned aerial vehicle during the water-carrying operation. The device is reasonably designed, can reduce the change amplitude of the center of gravity, is beneficial to improving the plant protection operation performance of the unmanned aerial vehicle, and is suitable for large-scale popularization. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 A three-dimensional view of an environment-friendly agricultural plant protection unmanned aerial vehicle provided for the embodiment;

[0020] Figure 2 A front view of an environment-friendly agricultural plant protection unmanned aerial vehicle provided for the embodiment;

[0021] Figure 3 A three-dimensional view of the water tank provided for the embodiment;

[0022] Figure 4 A top view of the water tank provided for the embodiment;

[0023] Figure 5 A sectional view of the water tank in the G-G direction provided for the embodiment;

[0024] Figure 6 For Figure 5 An enlarged schematic view of the A structure in

[0025] Figure 7 For Figure 5 An enlarged schematic view of the B structure in

[0026] Figure 8 Side view of the water tank provided for the embodiment;

[0027] Figure 9 Cross-sectional view of the water tank provided for the embodiment in the E-E direction;

[0028] Figure 10 Side view of the variable-volume floating garment after being unfolded provided for the embodiment;

[0029] Figure 11 Bottom view of the variable-volume floating garment after being unfolded provided for the embodiment;

[0030] Figure 12 Stereogram of the variable-volume floating garment after being unfolded provided for the embodiment;

[0031] Figure 13 Stereogram of the bottom support member provided for the embodiment;

[0032] Figure 14 Stereogram of the support assembly and the flow-stabilizing column provided for the embodiment;

[0033] In each of the above figures: 1, UAV body; 2, water tank; 21, water inlet pipe; 22, water outlet pipe; 3, water pump; 4, nozzle; 5, flow-stabilizing column; 6, support assembly; 61, support pipe; 62, U-shaped opening; 63, sealing cover; 7, variable-volume floating garment; 71, upper garment part; 72, arc part; 73, side garment part; 74, lower garment part; 75, movable ring; 76, telescopic water garment; 77, elastic cord; 78, through pipe; 8, control assembly; 81, threaded transmission rod; 82, micro-motor; 9, flexible connection assembly; 91, first tightening cord; 92, second tightening cord; 93, side support member; 931, support column; 932, cord-passing hole; 933, roller; 934, first toroidal surface; 94, bottom support member; 941, upper support ball; 942, lower support ball; 943, second toroidal surface; 944, third toroidal surface. Detailed implementation manners

[0034] In order to be able to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other. For the convenience of narration, words such as "upper", "lower", "left" and "right" as used below only indicate the same directions as the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

[0035] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed in the following specification.

[0036] Examples, such as Figures 1 - 14 As shown, the present invention provides an environmentally friendly agricultural plant protection drone, including a drone body 1, on which a water tank 2, a water pump 3 and multiple nozzles 4 are provided. The water tank 2 is used to supply water to the nozzles 4, and the water tank 2 is provided with a water inlet 21 and a water outlet 22, wherein the water inlet 21 is connected to the water pump 3, and the pumping end of the water pump 3 is connected to the nozzle 4 through multiple hoses. The nozzle 4 is installed on the wing with a universal hoop, and can always maintain a reasonable posture with the movement posture of the drone body 1, thereby completing spraying. On this basis, the interior of the water tank 2 provided by the present invention is provided with two spaced-apart flow stabilizing columns 5, the flow stabilizing columns 5 are hollow structures and a support assembly 6 is provided at the center thereof, a variable-volume float 7 made of elastic material is provided on the outside of the support assembly 6, the adjacent positions of the two variable-volume floats 7 are connected to each other, a control assembly 8 is provided inside the support assembly 6, and a flexible connection assembly 9 is provided on the power output side of the control assembly 8, which is transmission-connected to it and connected to the variable-volume float 7, and the control assembly 8 controls the volume change of the variable-volume float 7 by retracting and extending the flexible connection assembly 9.

[0037] Specifically, the use of the stabilizing rod 5 can block the path of water surge in the water tank 2, reducing the surge amplitude. The presence of the stabilizing rod 5 also causes the water to flow around it. The energy of the water flow will be consumed and dispersed to a certain extent during the process of bypassing the rod, making the water flow relatively stable, avoiding the situation where the center of gravity of the water tank 2 changes suddenly due to the violent flow of water. Therefore, the stabilizing rod 5 helps to improve the balance of the UAV during water-carrying operations. Furthermore, when the water tank 2 is filled with water to the maximum amount, the variable volume buoy 7 is at its smallest actual volume, almost flat, and floats on the surface of the water, without occupying too much water storage space. The principle of the variable volume buoy 7's balancing effect is that the actual working length of the flexible connecting assembly 9 is controlled by the control assembly 8, causing the variable volume buoy 7 to expand from a flat shape to a bulge, thereby filling the space in the water tank 2 that has lost water due to continuous water spraying, compressing the movement space of the existing water, thereby limiting the movement amplitude of the water in the water tank 2, and thus reducing the amplitude of the center of gravity change, which helps to reduce the difficulty of controlling the UAV during water-carrying operations.

[0038] like Figure 4 as well as Figures 10 - 12As shown in the figure, the variable-volume floating garment 7 includes an upper garment part 71. The unfolded shape of the upper garment part 71 is frustum-shaped, and the edges of the frustum are connected by arc parts 72. Side garment parts 73 are arranged on the arc parts 72, and the side garment parts 73 extend towards the corner positions of the water tank 2. The top end of the upper garment part 71 is fixedly connected to the neck position of the support assembly 6 and is close to the position of the top cover of the water tank 2. A lower garment part 74 is arranged at the bottom of the upper garment part 71. A cylindrical opening is arranged at the center of the lower garment part 74, and a movable ring 75 is arranged at the edge of the cylindrical opening. The movable ring 75 is used to reciprocate along the axial directions of the support assembly 6 and the steady flow column 5. When the variable-volume floating garment 7 is in a flat state, in addition to the contraction effect of the flexible connection assembly 9, there is also the elastic effect of the variable-volume floating garment 7 itself, which can make the variable-volume floating garment 7 contract and float on the water surface. During the unfolding process of the variable-volume floating garment 7, the upper garment part 71 is gradually expanded, the movable ring 75 descends along the support assembly 6 and the steady flow column 5, and the water is always located outside the variable-volume floating garment 7 due to the displacement effect of the variable-volume floating garment 7 and its own gravity. The expanded variable-volume floating garment 7 effectively compresses the active space of the existing water at present, and the side garment part 73 and the upper garment part 71 also divide the internal space of the water tank 2 into multiple interconnected cavities, effectively reducing the change range of the center of gravity on the basis of ensuring the effective flow of water to the water outlet 22, and reducing the difficulty of controlling the balance posture of the drone.

[0039] Furthermore, the cross-section of the side garment part 73 provided by the present invention is in a herringbone shape and its bottom is connected to the arc part 72. On the one hand, it can improve the force uniformity of the variable-volume floating garment 7 after unfolding. On the other hand, it can reduce the probability of the side garment part 73 being torn. On the third hand, it is to make a threading path for the first tightening rope 91 to better tighten the entire variable-volume floating garment 7.

[0040] In order to improve the ability of the variable-volume floating garment 7 to restrict the water flow movement after expansion, in addition to ensuring that the upper garment cloth and the lower garment part 74 have sufficient unfolding volume, the present invention also arranges telescopic water garments 76 on the adjacent surfaces of the two variable-volume floating garments 7. The outer surface of the telescopic water garment 76 after unfolding is in a saddle shape. The telescopic water garment 76 can occupy a certain water loss space, and in cooperation with the side garment part 73, divides the surrounding of the variable-volume floating garment 7 into multiple interconnected spaces, shortening the vertical movement ability of the water flow, thereby reducing the change range of the center of gravity. Moreover, the telescopic water garment 76 has a telescopic effect, so that a stretching surface can be established at the middle position between the two variable-volume floating garments 7, and the variable-volume floating garment 7 can be fully unfolded finally without arranging more flexible connection assemblies 9, so as to obtain the corresponding balance ability.

[0041] To enhance the expansion effect of the pyramidal shape of the variable volume float 7, the present invention provides a loop of elastic cord 77 at the connection between the upper garment portion 71 and the lower garment portion 74, and a through-tube 78 is provided at the bottom edge of the arc portion 72, which intersects with the elastic cord 77. The elastic cord 77 allows the skirt of the variable volume float 7 to have a better elastic effect. The through-tube 78 has a greater hardness than the elastic cord 77 and an arc length close to the arc length of the bottom edge of the arc portion 72, effectively expanding the bottom edge of the arc portion 72. The edge shape of the pyramidal portion is completely stretched open by the side garment portion 73, resulting in the two variable volume floats 7 presenting a relatively uniform pyramidal shape after deployment, which is also conducive to buffering the impact of water flow through their side surfaces.

[0042] like Figures 5 - 7 As shown, the flexible connection component 9 includes two first tightening ropes 91 and two second tightening ropes 92. The first tightening rope 91 is led out from the bottom of the variable volume floating garment 7 and extends along the surface of the variable volume floating garment 7. The end of the first tightening rope 91 is transmission-connected to the control component 8. The control component 8 reduces the volume of the variable volume floating garment 7 by retracting and releasing the first tightening rope 91. The second tightening rope 92 is led out from the bottom of the variable volume floating garment 7 and extends along the circumference direction of the side garment part 73. The transmission side of the second tightening rope 92 is provided with a plurality of supporting members that support and cooperate with it and are fixedly connected to the water tank 2. The end of the second tightening rope 92 is transmission-connected to the control component 8. The control component 8 expands the volume of the variable volume floating garment 7 by retracting and releasing the second tightening rope 92.

[0043] Specifically, the first tightening rope 91 is led out from the position of the movable ring 75, passes through the radial direction of the lower garment part 74 in a needle-threading manner, and extends from the fork space of the side garment part 73 to the neck of the support component 6, and then connects to the control component 8 inside the support component 6; if the length of the first tightening rope 91 becomes smaller, the length of the second tightening rope 92 can be appropriately lengthened, and the variable volume float 7 is folded upward, and the variable volume float 7 itself has an elastic contraction tendency until the volume of the variable volume float 7 is basically compressed into a flat shape. In this state, the variable volume float 7 floats on the water surface and does not occupy too much space in the water tank 2. The second tightening rope 92 is led out from the position of the movable ring 75, and passes through the radial direction of the lower garment part 74 and the circumferential direction of the side garment part 73 in a threading manner until it extends to the neck of the support component 6, and then connects to the control component 8 inside the support component 6; if the length of the second tightening rope 92 becomes smaller, the length of the first tightening rope 91 can be appropriately lengthened. Since the transmission path of the second tightening rope 92 is close to the side wall of the water tank 2, the variable-volume buoyancy jacket 7 can be expanded toward the inner wall of the water tank 2 under the action of the second tightening rope 92, thereby achieving the effect of expansion, and then playing the role of occupying space and stabilizing flow.

[0044] like Figure 9As shown in the figure, in order to improve the control efficiency of the flexible connection component 9, the control component 8 provided by the present invention includes two threaded drive rods 81. A micro motor 82 is provided at the power input section of the threaded drive rod 81. The micro motor 82 is connected to the power supply and circuit board carried by the drone through wires. The thread surface of one of the threaded drive rods 81 is helically engaged with two first tightening ropes 91, and the thread surface of the other threaded drive rod 81 is helically engaged with two second tightening ropes 92. The thread width of the threaded drive rod 81 is greater than the diameters of the first tightening rope 91 and the second tightening rope 92. The first tightening rope 91 and the second tightening rope 92 can be wound along the thread to improve the control accuracy of their lengths. Further, the actual working lengths of the first tightening rope 91 and the second tightening rope 92 on the variable volume life jacket 7 are respectively controlled by the rotation angles of different threaded drive rods 81. The micro motors 82 of different threaded drive rods 81 remain independent of each other to better control the retracting and extending lengths of the first tightening rope 91 and the second tightening rope 92.

[0045] In order to improve the cooperation performance between the second tightening rope 92 and the support member, in the present invention, each of the multiple support members paired with the second tightening rope 92 includes 2 side support members 93 and 1 bottom support member 94. The side support members 93 are arranged on the side of the water tank 2 and are distributed in a staggered manner up and down. The bottom support member 94 is arranged at the bottom of the water tank 2. The bottom support member 94 is used to change the turning direction of the second tightening rope 92 and provide a spreading and tightening fulcrum for the lower garment part 74. The side support members 93 provide 2 spreading and tightening fulcrums for the side garment part 73 through the staggered distribution method, so as to ensure that the variable volume life jacket 7 after unfolding has sufficient occupancy capacity.

[0046] In order to improve the transmission effect between the side support member 93 and the second tightening rope 92, the side support member 93 provided by the present invention includes a support column 931. A rope passing hole 932 is provided at the center of the support column 931. A roller 933 is provided on the side of the support column 931. A first toroidal surface 934 for cooperating with the second tightening rope 92 is provided on the roller 933. The roller 933 can roll slightly under the action of pressure, but always keeps the second tightening rope 92 in sliding contact with the first toroidal surface 934. And the first toroidal surface 934 is connected to the rope passing hole 932, so that the second tightening rope 92 passing through the rope passing hole 932 can be better connected to other insertion nodes of the side garment part 73. Through the two side support members 93, both a tightening fulcrum is provided, and at the same time, the free swing displacement of the second tightening rope 92 can be shortened, so as to ensure the balance effect of the variable volume life jacket 7.

[0047] As Figure 13As shown in the figure, in order to improve the transmission effect between the bottom support member 94 and the second tightening rope 92, the bottom support member 94 includes an upper support ball 941 and a lower support ball 942. The upper support ball 941 and the lower support ball 942 are respectively provided with a second toroidal surface 943 and a third toroidal surface 944. The second toroidal surface 943 and the third toroidal surface 944 are cross-connected. The bottom of the lower support ball 942 is fixedly connected to the water tank 2. The second tightening rope 92 can reciprocally stretch along the second toroidal surface 943 in a sliding manner to achieve the shape control effect of the variable-volume floating garment 7. The bottom support member 94 adopts a double-ball design. On the one hand, it facilitates the movement of water flow. On the other hand, it can prevent the second tightening rope 92 from winding around its surface and will not puncture the variable-volume floating garment 7. The third toroidal surface 944 of the lower support ball 942 not only serves to thread the second tightening rope 92, but also can make the spherical bottom of it multi-faceted, which is conducive to welding it to the bottom of the water tank 2 and improving the quality of its combination with the water tank 2.

[0048] As Figure 3 , Figure 9 , Figure 12 and Figure 14 As shown in the figure, the support assembly 6 provided by the present invention includes a T-shaped support tube 61. The lower half of the support tube 61 is nested with the flow-stabilizing column 5. The top of the support tube 61 basically touches the top cover of the water tank 2. And in cooperation with the flexible connection assembly 9, a U-shaped opening 62 for threading the flexible connection assembly 9 is provided at the top of the support tube 61, and a sealing cover 63 is provided at the top of the support tube 61. Among them, the U-shaped opening 62 can be used to thread the first tightening rope 91 and the second tightening rope 92, so as to establish an effective transmission relationship between the flexible connection assembly 9 and the control assembly 8. The sealing cover 63 is used to seal the support tube 61 to prevent a large amount of water from pouring back into the support assembly 6.

[0049] As Figure 5 and Figure 9 As shown in the figure, in order to facilitate the installation of the power part of the control assembly 8, the present invention provides a pair of installation grooves corresponding to the flow-stabilizing columns 5 at the bottom of the water tank 2, and a counterweight bottom support is provided at the bottom of the installation grooves. The counterweight bottom support not only serves to close the installation grooves, but also can concentrate the center of gravity of the water tank 2 in the water-loading and empty-tank states towards the middle position of the water tank 2, which is conducive to improving the balance of the water-carrying operation of the unmanned aerial vehicle.

[0050] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An environment-friendly agricultural plant protection unmanned aerial vehicle, comprising an unmanned aerial vehicle body, wherein a water tank, a water pump and a plurality of spray heads are arranged on the unmanned aerial vehicle body, the water tank is used for supplying water to the spray heads, a water filling port and a water outlet port are arranged on the water tank, and it is characterized in that, There are two flow-stabilizing columns arranged at intervals inside the water tank. The flow-stabilizing columns are of hollow structure and a support assembly is arranged at their centers. A variable-volume floating coat made of elastic material is arranged on the outside of the support assembly. The adjacent positions of the two variable-volume floating coats are connected to each other. A control assembly is arranged inside the support assembly. A flexible connection assembly that is drivingly connected to the control assembly and connected to the variable-volume floating coat is arranged on the power output side of the control assembly. The control assembly controls the volume of the variable-volume floating coat to change by taking in and releasing the flexible connection assembly.

2. The environmentally friendly agricultural plant protection unmanned aerial vehicle according to claim 1, characterized in that, The variable-volume floating coat includes an upper coat part. The unfolded shape of the upper coat part is frustum-shaped and the edges of the frustum are connected by arc parts. Side coat parts are arranged on the arc parts. The side coat parts extend towards the corner positions of the water tank. The top end of the upper coat part is fixedly connected to the neck position of the support assembly. A lower coat part is arranged at the bottom of the upper coat part. A cylindrical opening is arranged at the center of the lower coat part. A movable ring is arranged at the edge of the cylindrical opening. The movable ring is used for reciprocating movement along the axial directions of the support assembly and the flow-stabilizing column.

3. An environment-friendly agricultural plant protection drone according to claim 2, characterized in that, The cross-section of the side coat part is in a V shape and its bottom is connected to the arc part. A telescopic water coat is arranged on the adjacent surfaces of the two variable-volume floating coats. The outer surface of the telescopic water coat after unfolding is saddle-shaped.

4. An environment-friendly agricultural plant protection unmanned aerial vehicle according to claim 3, characterized in that, A circle of elastic cords is arranged at the connection position between the upper coat part and the lower coat part. A threading tube that is inserted and matched with the elastic cords is arranged at the bottom edge of the arc part.

5. An environment-friendly agricultural plant protection unmanned aerial vehicle according to claim 1 or 2, characterized in that, The flexible connection assembly includes two first tightening cords and two second tightening cords. The first tightening cords are led out from the bottom of the variable-volume floating coat and extend along the surface of the variable-volume floating coat. The ends of the first tightening cords are drivingly connected to the control assembly. The control assembly reduces the volume of the variable-volume floating coat by taking in and releasing the first tightening cords. The second tightening cords are led out from the bottom of the variable-volume floating coat and extend along the circumferential direction of the side coat part. A plurality of supporting members that support and cooperate with the second tightening cords and are fixedly connected to the water tank are arranged on the driving side of the second tightening cords. The ends of the second tightening cords are drivingly connected to the control assembly. The control assembly expands the volume of the variable-volume floating coat by taking in and releasing the second tightening cords.

6. An environment-friendly agricultural plant protection unmanned aerial vehicle according to claim 5, characterized in that, The control assembly includes two threaded transmission rods. A micro-motor is arranged at the power input section of the threaded transmission rods. The threaded surface of one of the threaded transmission rods is in spiral cooperation with the two first tightening cords. The threaded surface of the other threaded transmission rod is in spiral cooperation with the two second tightening cords.

7. An environmentally friendly agricultural plant protection unmanned aerial vehicle according to claim 5, characterized in that, The plurality of supporting members include 2 side supporting members and 1 bottom supporting member. The side supporting members are arranged on the side of the water tank and are distributed in a staggered manner up and down. The bottom supporting member is arranged at the bottom of the water tank.

8. An environment-friendly agricultural plant protection drone according to claim 7, characterized in that, The side supporting member includes a supporting column. A cord-passing hole is arranged at the center of the supporting column. A roller is arranged on the side surface of the supporting column. A first ring surface that cooperates with the second tightening cord is arranged on the roller.

9. An environment-friendly agricultural plant protection unmanned aerial vehicle according to claim 8, characterized in that, The bottom supporting member includes an upper supporting ball and a lower supporting ball. Second ring surfaces and third ring surfaces are respectively arranged on the upper supporting ball and the lower supporting ball. The second ring surface and the third ring surface are cross-connected. The bottom of the lower supporting ball is fixedly connected to the water tank.

10. An environment-friendly agricultural plant protection unmanned aerial vehicle according to claim 1, characterized in that, The support assembly includes a T-shaped support tube, which is nested with the flow stabilizing column. A U-shaped opening for passing through the flexible connection assembly is provided at the top of the support tube, and a sealing cover is provided at the top of the support tube.

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