Unmanned aerial vehicle for farmland control

Abstract

The unmanned aerial vehicle for farmland control is applied to the field of unmanned aerial vehicles, pesticide liquid is stored between liquid pressing cloth and the lower inner wall of a box cylinder, the liquid pressing cloth always tends to approach the box cylinder under the action of magnetic attraction force, firstly, the pesticide liquid is always extruded between the liquid pressing cloth and the box cylinder, the fluidity of the pesticide liquid is weakened to a certain degree, and the pesticide liquid is prevented from flowing out of the box cylinder; secondly, through the arrangement of a flow control plate, when the unmanned aerial vehicle body is greatly inclined, a liquid overflowing opening can be controlled to be opened, excessively inclined liquid medicine is transferred into a temporary liquid storage barrel in the non-inclined direction, the gravity center of a medicine storage box is changed, and counter force is provided for inclination of the unmanned aerial vehicle body and the medicine storage box; and the pesticide liquid transferred into the temporary liquid storage cylinder can slowly overflow into the auxiliary pesticide box, so that the pesticide liquid is sucked and sprayed to the outside by the unmanned aerial vehicle body again, and full utilization of the pesticide liquid is realized.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicles, and particularly to an unmanned aerial vehicle for farmland prevention and control. Background Art

[0002] The unmanned aerial vehicles used in the farmland field are generally plant protection unmanned aerial vehicles, which are used for agricultural and forestry plant protection operations. This type of unmanned aerial vehicle is composed of a flight platform (fixed wing, helicopter, multi-rotor aircraft), a navigation flight control, and a spraying mechanism. Through ground remote control or navigation flight control, spraying operations can be achieved, and pesticides, seeds, powders, etc. can be sprayed.

[0003] An important component indispensable in the technology of plant protection unmanned aerial vehicles is the on-board medicine box, and the pesticide liquid for spraying is injected into the medicine box.

[0004] However, during the flight spraying process of the plant protection unmanned aerial vehicle, there are often situations such as acceleration and deceleration, ascent and descent, or encountering changes in wind force and airflow. These factors are likely to cause fluctuations in the medicine box, and the liquid medicine in the medicine box will shake. The shaking of the liquid medicine will increase the amplitude of the tilt vibration of the unmanned aerial vehicle, thereby affecting the stability of the plant protection unmanned aerial vehicle, the spraying quality, and even causing destructive accidents in severe cases. Summary of the Invention

[0005] The purpose of this application is to solve the problem that the amplitude of the tilt vibration of the existing unmanned aerial vehicle is aggravated due to the shaking of the liquid medicine. Compared with the existing technology, a farmland prevention and control unmanned aerial vehicle is provided, including an unmanned aerial vehicle body. A liquid suction pipe is fixedly connected to the unmanned aerial vehicle body. A pair of bottom rods are provided on the lower side of the unmanned aerial vehicle body. A pair of support rods are fixedly connected between the bottom rods and the lower end of the unmanned aerial vehicle body. A medicine placement plate is also provided on the lower side of the unmanned aerial vehicle body. The medicine placement plate is fixedly connected between multiple support rods, and a medicine storage box is placed on the upper end of the medicine placement plate;

[0006] The medicine storage box includes a box cylinder. An inner cylinder is fixedly connected inside the box cylinder. A pair of partition plates are fixedly connected between the box cylinder and the inner cylinder. The partition plates are located on the horizontal plane where the center line of the inner cylinder is located. A liquid pressing cloth is provided on the lower side of the inner cylinder. The front and rear ends of the liquid pressing cloth are respectively fixedly connected to the front and rear inner walls of the box cylinder. The left and right ends of the liquid pressing cloth are both fixedly connected to the outer wall of the lower end of the inner cylinder;

[0007] A liquid infusion pipe communicating with its interior is fixedly connected to the rear end of the box cylinder. The end of the liquid infusion pipe far from the medicine storage box is threadedly connected to the liquid suction pipe. The pipe orifice end of the liquid infusion pipe is located below the liquid pressing cloth. Magnetic coating is applied to the lower surface of the liquid pressing cloth and the lower inner wall of the box cylinder. The liquid medicine is stored between the liquid pressing cloth and the lower inner wall of the box cylinder. A plurality of exhaust holes are opened at the lower end of the inner cylinder close to the liquid pressing cloth, and a plurality of air outlet holes located inside the inner cylinder are opened at the rear end of the box cylinder.

[0008] Further, a base plate is fixedly connected to the lower end of the box cylinder. The base plate and the medicine placing plate are connected by bolts. A plurality of uniformly distributed mounting holes are formed in the base plate, and a plurality of mounting grooves are formed in the upper end of the medicine placing plate. The bolts are threadedly connected to the inside of the mounting holes and the mounting grooves.

[0009] Optionally, a flow control plate is further provided on the partition plate. The flow control plate includes a pair of sealing plates. The pair of sealing plates are respectively located on the upper and lower sides of the partition plate. An overflow port is formed in the partition plate. A magnetic plate penetrating the overflow port is fixedly connected between the pair of sealing plates.

[0010] Optionally, an anti-touch strip is fixedly connected to one end of the magnetic plate close to the inner cylinder, and a magnetic conduction sheet is fixedly connected to the inner wall of the overflow port close to the inner cylinder.

[0011] Optionally, a pair of arc-shaped grooves are formed at one end of the pair of sealing plates close to each other. A sliding rod is rotatably connected to the inside of the arc-shaped grooves. The sliding rod is in a line contact sealing state with the partition plate, and the distance between the pair of sliding rods on the same sealing plate is greater than the orifice width of the overflow port.

[0012] Optionally, a pair of temporary liquid storage cylinders are fixedly connected to the inside of the inner cylinder. The pair of temporary liquid storage cylinders are symmetrical with respect to the vertical plane where the center line of the inner cylinder is located, and are both located below the center line of the inner cylinder.

[0013] Optionally, a pair of liquid guiding square tubes are fixedly connected between the outer ends of the temporary liquid storage cylinders and the inner wall of the inner cylinder. A plurality of liquid guiding holes located above the partition plate are formed in the inner cylinder.

[0014] Optionally, the left liquid guiding hole communicates with the right temporary liquid storage cylinder through a liquid guiding square tube, and the right liquid guiding hole communicates with the left temporary liquid storage cylinder through a liquid guiding square tube.

[0015] Optionally, a secondary medicine box is fixedly connected to the front end of the box cylinder, and a pair of overflow holes communicating the temporary liquid storage cylinders and the secondary medicine box are fixedly connected to the front end of the box cylinder. A return pipe is fixedly connected between the front end of the secondary medicine box and the infusion pipe. A one-way valve is fixedly installed inside the return pipe.

[0016] Optionally, the infusion pipe includes a hard pipe, a flexible pipe and a joint pipe. The flexible pipe is fixedly connected between the hard pipe and the joint pipe. The return pipe is fixedly connected to and communicates with the hard pipe. The joint pipe is threadedly connected to the liquid suction pipe.

[0017] Compared with the prior art, the advantages of the present application are as follows:

[0018] (1) In this application, the liquid medicine is stored between the liquid pressing cloth and the inner wall of the lower part of the box cylinder. And under the action of magnetic attraction, the liquid pressing cloth always has a tendency to approach the box cylinder. First of all, the liquid medicine is always squeezed between the liquid pressing cloth and the box cylinder, and its fluidity is weakened to a certain extent, making it not easy to shake greatly with the UAV body. Secondly, through the setting of the flow control plate, when a large inclination occurs, the overflow port can be controlled to open, and the overly inclined liquid medicine is transferred to the temporary liquid storage cylinder in the non-inclined direction, changing the center of gravity of the medicine storage box, providing a counterforce for the inclination of the UAV body and the medicine storage box. In addition, the liquid medicine transferred to the temporary liquid storage cylinder can slowly overflow into the secondary medicine box, and is then sucked by the UAV body again and sprayed to the outside, realizing the full utilization of the liquid medicine.

[0019] (2) As the liquid medicine is gradually output, the content of the liquid medicine inside the box cylinder gradually decreases. Under the action of magnetic attraction, the liquid medicine is always squeezed between the liquid pressing cloth and the box cylinder. This plays a certain restrictive role on the liquid medicine, making it not easy to shake greatly with the change of the flight trend of the UAV body. In addition, even if the liquid medicine has a certain shake with the inclination of the UAV body, under the extrusion of the liquid pressing cloth, the fluidity of the liquid medicine is weakened, and it can quickly become stable again, thus effectively improving the stability of the UAV body.

[0020] (3) When the UAV body tilts to the right, the partition board and the hole-sealing board also tilt accordingly. At this time, under the action of its own gravity, the right hole-sealing board overcomes the magnetic force between the magnetic plate and the magnetic conduction sheet, and gradually slides down along the partition board, thus exposing the overflow port. At this time, the liquid medicine tilting to the right can overflow upward through the overflow port, and gradually flow into the left temporary liquid storage cylinder through the liquid guide hole and the liquid guide square pipe, moving the center of gravity of the medicine storage box to the left, thereby providing a counterforce for the right tilt of the UAV body and the medicine storage box, and accelerating the balance of the UAV body. When the tilt amplitude of the UAV body decreases to a certain extent, the tilt angle of the hole-sealing board also decreases, and its gravity is not enough to overcome the magnetic force of the magnetic plate. The hole-sealing board moves back to the initial position under the magnetic attraction and covers the orifice of the overflow port again. Description of the Drawings

[0021] Figure 1 is a three-dimensional view of this application Figure 1 ;

[0022] Figure 2 is a three-dimensional view of this application Figure 2 ;

[0023] Figure 3 is a partial three-dimensional comparison view of Embodiment 1 and Embodiment 3 of this application;

[0024] Figure 4 is a partial three-dimensional view of Embodiment 3 of this application;

[0025] Figure 5Schematic diagram of the front structure of the medicine storage box in Embodiment 1 and Embodiment 2 of the present application;

[0026] Figure 6 Schematic diagram of the front structure of the medicine storage box in Embodiment 1 of the present application;

[0027] Figure 7 Schematic diagrams of the front structure of the medicine storage box in Embodiment 2 of the present application before and after tilting;

[0028] Figure 8 is Figure 7 Schematic diagram of the structure at A in;

[0029] Figure 9 Stereogram of the internal structure of the medicine storage box in Embodiment 2 of the present application;

[0030] Figure 10 Schematic diagram of the front structure of the medicine storage box in Embodiment 2 of the present application when tilted;

[0031] Figure 11 Schematic diagram of the side structure of the medicine storage box in Embodiment 3 of the present application.

[0032] Description of the reference numerals in the figure:

[0033] 1 UAV body, 101 liquid suction pipe, 2 support rod, 3 bottom rod, 4 medicine placement plate, 5 medicine storage box, 51 box cylinder, 5101 air outlet hole, 5102 overflow hole, 52 inner cylinder, 5201 exhaust hole, 5202 liquid guiding hole, 53 partition board, 5301 liquid overflow port, 54 liquid pressing cloth, 55 flow control plate, 551 sealing plate, 552 magnetic plate, 553 anti-touch strip, 554 sliding rod, 56 liquid guiding square pipe, 57 temporary liquid storage cylinder, 6 cushion plate, 7 infusion pipe, 71 hard pipe, 72 soft pipe, 73 joint pipe, 8 auxiliary medicine box, 9 return pipe. Detailed implementation manners

[0034] In the embodiments, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings of the specification. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0035] Embodiment 1:

[0036] Please refer to Figure 1 and Figure 2 , the present invention provides an unmanned aerial vehicle for farmland prevention and control, including a UAV body 1, a liquid suction pipe 101 is fixedly connected to the UAV body 1, a pair of bottom rods 3 are provided on the lower side of the UAV body 1, a pair of support rods 2 are fixedly connected between the bottom rods 3 and the lower end of the UAV body 1, a medicine placement plate 4 is further provided on the lower side of the UAV body 1, the medicine placement plate 4 is fixedly connected between a plurality of support rods 2, and a medicine storage box 5 is placed on the upper end of the medicine placement plate 4.

[0037] Please refer to Figure 5 As shown in Figure 5 , the medicine storage box 5 includes a box cylinder 51. An inner cylinder 52 is fixedly connected inside the box cylinder 51. A pair of partition plates 53 are fixedly connected between the box cylinder 51 and the inner cylinder 52. The partition plates 53 are located on the horizontal plane where the center line of the inner cylinder 52 is located. A liquid pressing cloth 54 is provided below the inner cylinder 52. The liquid pressing cloth 54 is made of a waterproof and airtight flexible material. The front and rear ends of the liquid pressing cloth 54 are respectively fixedly connected to the front and rear inner walls of the box cylinder 51. The left and right ends of the liquid pressing cloth 54 are both fixedly connected to the outer wall of the lower end of the inner cylinder 52.

[0038] Please refer to Figure 4 As shown in Figure 4 , an infusion tube 7 communicated with its interior is fixedly connected to the rear end of the box cylinder 51. One end of the infusion tube 7 far from the medicine storage box 5 is threadedly connected to a liquid suction tube 101. The pipe orifice end of the infusion tube 7 is located below the liquid pressing cloth 54. As shown in Figure 6 Figure 6 , a magnetic coating is provided on both the lower surface of the liquid pressing cloth 54 and the lower inner wall of the box cylinder 51. A plurality of exhaust holes 5201 are opened at the lower end of the inner cylinder 52 close to the liquid pressing cloth 54. A plurality of air outlet holes 5101 located inside the inner cylinder 52 are opened at the rear end of the box cylinder 51.

[0039] The liquid medicine is stored between the liquid pressing cloth 54 and the lower inner wall of the box cylinder 51. During use, the liquid medicine is input into the interior of the drone body 1 through the infusion tube 7 for spraying outward. As the liquid medicine is gradually output, the content of the liquid medicine inside the box cylinder 51 gradually decreases. Under the action of magnetic attraction, the liquid pressing cloth 54 has a tendency to approach the lower inner wall of the box cylinder 51, so that the liquid medicine is always squeezed between the liquid pressing cloth 54 and the box cylinder 51. This plays a certain restrictive role on the liquid medicine, making it not easy to shake greatly with the change of the flight trend of the drone body 1. In addition, even if the liquid medicine has a certain shake with the inclination of the drone body 1, under the extrusion of the liquid pressing cloth 54, the fluidity of the liquid medicine is weakened and it can quickly become stable again, thereby effectively improving the stability of the drone body 1.

[0040] Combined with Figure 3 and Figure 4 As shown in Figure 4 , a backing plate 6 is fixedly connected to the lower end of the box cylinder 51. The backing plate 6 and the medicine placing plate 4 are connected by bolts. A plurality of uniformly distributed mounting holes are opened on the backing plate 6. A plurality of mounting grooves are opened at the upper end of the medicine placing plate 4. The bolts are threadedly connected inside the mounting holes and the mounting grooves. Through the detachable connection between the medicine placing plate 4 and the backing plate 6, it is convenient to install and disassemble the medicine storage box 5. At the same time, the infusion tube 7 and the liquid suction tube 101 can also be freely connected and disassembled, and the liquid medicine can be added into the box cylinder 51 through the infusion tube 7.

[0041] Embodiment 2:

[0042] The difference between this embodiment and Embodiment 1 is that: on the basis of Embodiment 1, a flow control plate 55 is added, specifically as follows:

[0043] As Figure 5 and Figure 8 shown, a flow control plate 55 is further provided on the partition plate 53. The flow control plate 55 includes a pair of hole-sealing plates 551, and the pair of hole-sealing plates 551 are respectively located on the upper and lower sides of the partition plate 53. An overflow port 5301 is formed on the partition plate 53. A magnetic plate 552 penetrating through the overflow port 5301 is fixedly connected between the pair of hole-sealing plates 551. An anti-touch strip 553 is fixedly connected to one end of the magnetic plate 552 close to the inner cylinder 52. A magnetic conduction sheet is fixedly connected to the inner wall of the overflow port 5301 close to the inner cylinder 52.

[0044] Please refer to Figure 9 , a pair of temporary liquid storage cylinders 57 are fixedly connected inside the inner cylinder 52. The pair of temporary liquid storage cylinders 57 are symmetric with respect to the vertical plane where the center line of the inner cylinder 52 is located, and are both located below the center line of the inner cylinder 52. A pair of liquid guiding square tubes 56 are fixedly connected between the outer ends of the temporary liquid storage cylinders 57 and the inner wall of the inner cylinder 52. A plurality of liquid guiding holes 5202 located above the partition plate 53 are formed on the inner cylinder 52. The left liquid guiding hole 5202 communicates with the right temporary liquid storage cylinder 57 through the liquid guiding square tube 56, and the right liquid guiding hole 5202 communicates with the left temporary liquid storage cylinder 57 through the liquid guiding square tube 56.

[0045] When the UAV body 1 is flying horizontally and stably, due to the magnetic attraction force between the magnetic plate 552 and the magnetic conduction sheet, the magnetic plate 552 is relatively stably located close to the inner cylinder 52. At this time, the pair of hole-sealing plates 551 respectively block the upper and lower orifices of the overflow port 5301, so that the liquid medicine on the lower side is not easily overflowed to the upper side through the overflow port 5301, facilitating the normal output and spraying of the liquid medicine;

[0046] When the UAV body 1 has a large inclination during flight, please refer to Figure 10 , for example, when the UAV body 1 tilts to the right, the partition plate 53 and the hole-sealing plate 551 also tilt accordingly. At this time, the right hole-sealing plate 551, under the action of its own gravity, overcomes the magnetic force between the magnetic plate 552 and the magnetic conduction sheet, and gradually slides down along the partition plate 53, thereby exposing the overflow port 5301. At this time, the liquid medicine tilting to the right can overflow upward through the overflow port 5301, and gradually flow into the left temporary liquid storage cylinder 57 through the liquid guiding hole 5202 and the liquid guiding square tube 56, causing the center of gravity of the medicine storage tank 5 to move to the left, thereby providing a counterbalance force for the right tilt of the UAV body 1 and the medicine storage tank 5, and accelerating the balance of the UAV body 1; similarly, when the UAV body 1 tilts to the left, the left magnetic plate 552 slides to the left, and the liquid medicine flows into the right temporary liquid storage cylinder 57 through the exposed overflow port 5301, providing a counterbalance force for the left tilt of the UAV body 1 and the medicine storage tank 5, and accelerating the balance of the UAV body 1.

[0047] When the inclination amplitude of the UAV body 1 decreases to a certain extent, the inclination angle of the sealing plate 551 also decreases accordingly, and its gravitational force is insufficient to overcome the magnetic force of the magnetic plate 552. The sealing plate 551 moves back to its initial position under the magnetic attraction and covers the orifice of the overflow port 5301 again.

[0048] Please refer to Figure 8 , a pair of arc-shaped grooves are provided at the ends of the pair of sealing plates 551 close to each other. A sliding rod 554 is rotatably connected inside the arc-shaped groove. The distance between the pair of sliding rods 554 on the same sealing plate 551 is greater than the orifice width of the overflow port 5301. The sliding rod 554 is in a line contact sealing state with the partition plate 53. While achieving sealing, the friction between the sealing plate 551 and the partition plate 53 can be reduced, facilitating the tilting and sliding of the box barrel 51.

[0049] Embodiment 3:

[0050] Based on Embodiment 2, this embodiment adds a secondary medicine box 8 and its related structures, specifically as follows: Referring to Figure 4 and Figure 11 , a secondary medicine box 8 is fixedly connected to the front end of the box barrel 51, and a pair of overflow holes 5102 connecting the temporary liquid storage cylinder 57 and the secondary medicine box 8 are fixedly connected to the front end of the box barrel 51. A return pipe 9 is fixedly connected between the front end of the secondary medicine box 8 and the infusion pipe 7, and a one-way valve is fixedly installed inside the return pipe 9.

[0051] In Embodiment 2, through the setting of the flow control plate 55, the transfer of the liquid medicine into the temporary liquid storage cylinder 57 is realized when the UAV body 1 tilts, providing a counterforce for the tilting of the UAV body 1; in this embodiment, through the setting of the upper secondary medicine box 8, the return pipe 9 and related structures, the liquid medicine transferred into the temporary liquid storage cylinder 57 can slowly flow into the secondary medicine box 8 through the overflow hole 5102. When the UAV body 1 extracts the liquid medicine through the infusion pipe 7, the transferred liquid medicine can be sprayed to the outside by the UAV body 1 through the return pipe 9 and the infusion pipe 7 in sequence, realizing the utilization of the liquid medicine.

[0052] The infusion pipe 7 includes a hard pipe 71, a flexible pipe 72 and a connector pipe 73. The flexible pipe 72 is fixedly connected between the hard pipe 71 and the connector pipe 73. The return pipe 9 is fixedly connected and communicated with the hard pipe 71. The connector pipe 73 is threadedly connected to the liquid suction pipe 101. Due to the flexible and bendable characteristics of the flexible pipe 72, it is convenient to connect the connector pipe 73 and the liquid suction pipe 101.

[0053] The above is only the best implementation mode adopted by the present application in combination with the current actual needs, but the protection scope of the present application is not limited thereto.

Claims

1. A drone for farmland protection, comprising a drone body (1), a liquid suction tube (101) fixedly connected to the drone body (1), a pair of bottom bars (3) provided on the lower side of the drone body (1), a pair of support bars (2) fixedly connected between the bottom bars (3) and the lower end of the drone body (1), characterized in that: A medicine placement plate (4) is also provided on the lower side of the drone body (1), the medicine placement plate (4) is fixedly connected between the plurality of support rods (2), and a medicine storage box (5) is placed on the upper end of the medicine placement plate (4); The medicine storage box (5) comprises a box tube (51), an inner tube (52) is fixedly connected to the inside of the box tube (51), a pair of partitions (53) are fixedly connected between the box tube (51) and the inner tube (52), the partitions (53) are located on a horizontal plane where the center line of the inner tube (52) is located, a liquid pressing cloth (54) is provided on the lower side of the inner tube (52), front and rear ends of the liquid pressing cloth (54) are respectively fixedly connected to the front and rear inner walls of the box tube (51), and left and right ends of the liquid pressing cloth (54) are fixedly connected to the lower outer wall of the inner tube (52); The rear end of the box barrel (51) is fixedly connected to a liquid infusion tube (7) communicating with the interior thereof; one end of the liquid infusion tube (7) away from the medicine storage box (5) is threadedly connected to a liquid suction tube (101); the tube mouth of the liquid infusion tube (7) is located at the lower side of the liquid pressing cloth (54); the lower surface of the liquid pressing cloth (54) and the lower inner wall of the box barrel (51) are both coated with a magnetic coating; the medicine liquid is stored between the liquid pressing cloth (54) and the lower inner wall of the box barrel (51); a plurality of exhaust holes (5201) are formed at the lower end of the inner barrel (52) near the liquid pressing cloth (54); and a plurality of exhaust holes (5101) are formed at the rear end of the box barrel (51) and are located inside the inner barrel (52).

2. The drone for farmland protection according to claim 1, characterized in that: A backing plate (6) is fixedly connected to the lower end of the box tube (51), and the backing plate (6) is connected to the medicine placement plate (4) by bolts. The backing plate (6) is provided with a plurality of evenly distributed mounting holes, and the upper end of the medicine placement plate (4) is provided with a plurality of mounting grooves, and the bolts are threadedly connected to the inside of the mounting holes and the mounting grooves.

3. The drone for farmland protection according to claim 1, characterized in that: The partition plate (53) is further provided with a flow control plate (55), the flow control plate (55) comprising a pair of sealing plates (551), the pair of sealing plates (551) being respectively located on the upper and lower sides of the partition plate (53), the partition plate (53) being provided with an overflow port (5301), and a magnetic plate (552) penetrating the overflow port (5301) being fixedly connected between the pair of sealing plates (551).

4. The drone for farmland protection according to claim 3, characterized in that: An end of the magnetic plate (552) close to the inner cylinder (52) is fixedly connected to an anti-touch strip (553), and an inner wall of the overflow port (5301) close to the inner cylinder (52) is fixedly connected to a magnetic conductive sheet.

5. The drone for farmland protection according to claim 3, characterized in that: A pair of arc-shaped grooves are formed at the ends of the pair of sealing plates (551) that are close to each other, and a sliding rod (554) is rotatably connected inside the arc-shaped groove. The sliding rod (554) and the partition plate (53) are in a line contact sealing state, and the distance between the pair of sliding rods (554) on the same sealing plate (551) is greater than the width of the overflow port (5301).

6. The drone for farmland protection according to claim 1, characterized in that: A pair of temporary liquid storage cylinders (57) are fixedly connected to the interior of the inner cylinder (52); the pair of temporary liquid storage cylinders (57) are symmetrical to each other about a vertical plane where the center line of the inner cylinder (52) is located, and are both located below the center line of the inner cylinder (52).

7. The drone for farmland protection according to claim 6, characterized in that: A pair of liquid-conducting square tubes (56) are fixedly connected between the outer end of the temporary liquid storage cylinder (57) and the inner wall of the inner cylinder (52), and the inner cylinder (52) is provided with a plurality of liquid-conducting holes (5202) located on the upper side of the partition plate (53).

8. The drone for farmland protection according to claim 7, characterized in that: The liquid guide hole (5202) on the left side is communicated with the temporary liquid storage cylinder (57) on the right side through the liquid guide square tube (56), and the liquid guide hole (5202) on the right side is communicated with the temporary liquid storage cylinder (57) on the left side through the liquid guide square tube (56).

9. The drone for farmland protection according to claim 6, characterized in that: The front end of the box barrel (51) is fixedly connected to an auxiliary medicine box (8), and the front end of the box barrel (51) is fixedly connected to a pair of overflow holes (5102) that communicate with the temporary liquid storage cylinder (57) and the auxiliary medicine box (8). A return pipe (9) is fixedly connected between the front end of the auxiliary medicine box (8) and the infusion tube (7), and a one-way valve is fixedly installed inside the return pipe (9).

10. The drone for farmland protection according to claim 9, characterized in that: The infusion tube (7) comprises a hard tube (71), a soft tube (72) and a joint tube (73); the soft tube (72) is fixedly connected between the hard tube (71) and the joint tube (73); the return tube (9) is fixedly connected to and communicates with the hard tube (71); and the joint tube (73) is threadedly connected to the suction tube (101).

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