Large-load sowing unmanned aerial vehicle

Abstract

The large-load sowing unmanned aerial vehicle comprises an unmanned aerial vehicle body, landing brackets are fixedly installed on the two sides of the bottom of the unmanned aerial vehicle body, a material containing box located between the two landing brackets is arranged below the unmanned aerial vehicle body, and two hanging frames are fixedly installed at the top of the material containing box; the two hanging frames are detachably and fixedly connected with the bottom of the unmanned aerial vehicle body, a discharging pipe is fixedly installed in the middle of the bottom of the material containing box, and an electromagnetic discharging valve is fixedly installed at the bottom end of the discharging pipe. The device is reasonable in design, can be used for uniformly sowing solid seed particles or chemical fertilizer particles and can also be used for uniformly sowing liquid pesticide solutions, so that the practical performance is improved, in the sowing process, the sowing material amount can be accurately controlled, and the sowing efficiency is improved. The sowing range and the sowing density are accurately controlled, and waste of materials is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicles, in particular to a large-load spreading unmanned aerial vehicle. Background Art

[0002] A large-load spreading drone is an unmanned aerial vehicle that can carry heavy objects for spreading operations. Compared with traditional small drones, the payload of a large-load spreading drone can reach tens of kilograms or even hundreds of kilograms, which enables it to carry a large amount of seeds, fertilizers, pesticides and other materials at one time, reducing the number of round trips to replenish materials, thereby improving work efficiency. Today, large-load spreading drones are widely used in agriculture, forestry, environmental governance and other fields.

[0003] In the related technology, although large-load spreading drones can meet the basic needs for spreading materials, it is found in actual operation that there are still at least the following defects: large-load spreading drones can usually only spread materials in one physical form. For example, large-load spreading drones used for spreading solid seed particles or fertilizer particles are not suitable for spreading liquid pesticide solutions. Large-load spreading drones used for spreading liquid pesticide solutions are not suitable for spreading solid seed particles or fertilizer particles. They have poor versatility and practicality. In addition, during the process of spreading materials, the spreading range and spreading density are easily uneven, resulting in material waste. For this reason, we propose a large-load spreading drone to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a large-load spreading drone, which solves the problem that large-load spreading drones can usually only spread materials in one physical form, have poor versatility and practicality, and are prone to uneven spreading range and density during the material spreading process, resulting in material waste.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a large-load spreading UAV, comprising a UAV main body, landing brackets are fixedly installed on both sides of the bottom of the UAV main body, a material holding box located between the two landing brackets is arranged below the UAV main body, two hanging racks are fixedly installed on the top of the material holding box, and the two hanging racks are detachably fixedly connected to the bottom of the UAV main body, a discharge pipe is fixedly installed in the middle part of the bottom of the material holding box, an electromagnetic discharge valve is fixedly installed at the bottom of the discharge pipe, and a spreading mechanism for evenly spreading materials is arranged at the bottom of the material holding box.

[0008] Preferably, the inner bottom wall of the material loading box is of an inclined surface structure with a concave middle part.

[0009] Preferably, the spreading mechanism includes a hollow spreading disc, a plurality of spreading pipes, a driving assembly, a material control assembly and a solution atomization assembly. The hollow spreading disc is located at the bottom end of the discharge pipe. An installation hole is provided at the center of the top of the hollow spreading disc. The bottom end of the hollow spreading disc passes through the installation hole rotatably through a bearing. The electromagnetic discharge valve is located inside the hollow spreading disc. A plurality of spreading pipes are fixedly installed on the outer side wall of the hollow spreading disc. A plurality of spreading pipes are communicated with the inside of the hollow spreading disc. The plurality of spreading pipes are distributed in an equally spaced annular shape. The driving assembly, the control assembly and the solution atomization assembly are all arranged between the material loading box and the hollow spreading disc. The driving assembly is used to control the horizontal rotation of the hollow spreading disc. The material control assembly is used to control the intermittent entry of the material in the material loading box into the hollow spreading disc. The solution atomization assembly is used to atomize the pesticide solution discharged from the plurality of spreading pipes into a water mist state.

[0010] Preferably, a conical guide seat is fixedly installed on the inner bottom wall of the hollow spreading disc, and the diameter dimension of the conical guide seat decreases sequentially from bottom to top.

[0011] Preferably, the driving assembly includes a motor, a driving shaft, a gear and an external gear ring. The motor is fixedly installed at the bottom of the material loading box and on the left side of the discharge pipe. The driving shaft is fixedly installed at the output shaft end of the motor. The gear is fixedly sleeved on the bottom end of the driving shaft. The external gear ring is fixedly installed on the top of the hollow spreading disc. The bottom end of the discharge pipe passes through the external gear ring, and the external gear ring meshes with the gear.

[0012] Preferably, the material control assembly includes a cam, a baffle, a push plate and a spring. The cam is fixedly sleeved on the driving shaft and above the gear. A through hole is provided on the left side of the discharge pipe. The right end of the baffle slides through the through hole. The push plate is fixedly installed on the left side of the baffle. The cam abuts against the left side wall of the push plate. One end of the spring is fixedly connected to the right side wall of the push plate, and the other end of the spring is fixedly connected to the outer wall of the discharge pipe. The spring is located below the baffle.

[0013] Preferably, sealing strips are fixedly installed on the top inner wall and the bottom inner wall of the through hole, and the two sealing strips are respectively in sliding sealing contact with the top and the bottom of the baffle.

[0014] Preferably, the solution atomization assembly includes a booster air pump, an air delivery pipe, an electric telescopic rod, a connecting plate, and an atomization mesh ring. The booster air pump is fixedly installed at the bottom of the material loading box and on the right side of the discharge pipe. The air delivery pipe is fixedly connected to the discharge end of the booster air pump. One end of the air delivery pipe extends into the discharge pipe and is located below the baffle. The electric telescopic rod is fixedly installed at the bottom of the booster air pump. The connecting plate is fixedly installed at the output shaft end of the electric telescopic rod. The atomization mesh ring is fixedly installed at the bottom of the connecting plate. The top of the hollow spreading disc penetrates through the atomization mesh ring. A plurality of spreading pipes are all located below the atomization mesh ring. One end of the spreading pipe away from the hollow spreading disc is slidably matched with the inner wall of the atomization mesh ring.

[0015] Preferably, a limiting ring is fixedly installed on the inner wall of the atomization mesh ring.

[0016] Preferably, a feeding hole is opened at the top of the material loading box, and a plug is installed in the feeding hole by means of internal thread.

[0017] (III) Beneficial effects

[0018] The present invention provides a large-load spreading unmanned aerial vehicle, which has the following beneficial effects:

[0019] (1) For the large-load spreading unmanned aerial vehicle, by using a driving assembly composed of a motor, a driving shaft, a gear, and an external gear ring, the horizontal rotation of the hollow spreading disc can be controlled. Under the action of the centrifugal force generated by the rotation of the hollow spreading disc, the materials discharged from the plurality of spreading pipes can be dispersed in different directions, so as to achieve a wider and more uniform spreading effect, and effectively avoid the concentrated spreading of materials in a certain area.

[0020] (2) For the large-load spreading unmanned aerial vehicle, by using a material control assembly composed of a cam, a baffle, a push plate, and a spring, the intermittent entry of materials into the hollow spreading disc can be realized, and then the amount of materials to be spread can be accurately controlled according to actual needs, avoiding waste of materials, and at the same time, the spreading range and density can be controlled more precisely.

[0021] (3) For the large-load spreading unmanned aerial vehicle, by using a solution atomization assembly composed of a booster air pump, an air delivery pipe, an electric telescopic rod, a connecting plate, and an atomization mesh ring, during the process of spreading the pesticide liquid, the pesticide liquid can have a certain flow rate when discharged from the plurality of spreading pipes, increasing the spraying range of the pesticide liquid state, and enabling the pesticide solution discharged from the spreading pipe to be atomized into a water mist state, which can increase the contact area between the pesticide solution and the target area, improve the use efficiency of the pesticide solution, enable the pesticide solution to more evenly cover the area to be treated, and enhance the prevention and control effect.

[0022] (4) This large-load spreading unmanned aerial vehicle can be used for evenly spreading solid seed particles or fertilizer particles by using a spreading mechanism composed of a hollow spreading disc, multiple spreading pipes, a driving component, a material control component, and a solution atomization component. It can also be used for evenly spreading liquid pesticide solutions, thereby improving the practical performance. Moreover, during the spreading process, the amount of the spread material can be accurately controlled, and the spreading range and spreading density can be precisely controlled to avoid waste of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0024] Figure 2 is a schematic three-dimensional structure diagram of the material loading box and the spreading mechanism;

[0025] Figure 3 is Figure 2 a schematic three-dimensional structure diagram of removing the solution atomization component in

[0026] Figure 4 is a schematic cross-sectional structure diagram of the material loading box and the spreading mechanism;

[0027] Figure 5 is Figure 4 an enlarged schematic diagram of part A in

[0028] Figure 6 is a schematic three-dimensional structure diagram of the atomization mesh ring.

[0029] In the figure: 1, unmanned aerial vehicle main body; 2, landing support; 3, material loading box; 4, hanging rack; 5, discharge pipe; 6, electromagnetic discharge valve; 7, spreading mechanism; 8, cock; 701, hollow spreading disc; 702, spreading pipe; 703, conical guide seat; 704, motor; 705, drive shaft; 706, gear; 707, external gear ring; 708, cam; 709, through hole; 710, baffle; 711, push plate; 712, spring; 713, booster air pump; 714, air delivery pipe; 715, electric telescopic rod; 716, connecting plate; 717, atomization mesh ring; 718, limiting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] As Figures 1-6As shown in the figure, the present invention provides a technical solution: a large-load spreading unmanned aerial vehicle, which includes a UAV main body 1. Both sides of the bottom of the UAV main body 1 are fixedly installed with landing brackets 2, and the landing brackets 2 are used for the takeoff and landing support of the UAV main body 1. Below the UAV main body 1, there is a material loading box 3 located between the two landing brackets 2. The material loading box 3 is used for loading materials such as seeds, fertilizers, and pesticide solutions. At the top of the material loading box 3, two hanging brackets 4 are fixedly installed, and both of the two hanging brackets 4 are detachably fixedly connected to the bottom of the UAV main body 1, so as to facilitate the disassembly and assembly of the material loading box 3 and the UAV main body 1. In the middle of the bottom of the material loading box 3, a discharge pipe 5 is fixedly installed, and at the bottom end of the discharge pipe 5, an electromagnetic discharge valve 6 is fixedly installed. The discharge pipe 5 and the electromagnetic discharge valve 6 are used to control the discharge of the materials in the material loading box 3. The inner wall of the bottom of the material loading box 3 is an inclined surface structure with a concave middle part, which can ensure that all the materials in the material loading box 3 pass through the discharge pipe 5 completely. Among them:

[0032] At the bottom of the material loading box 3, a spreading mechanism 7 for evenly spreading materials is provided. It can be used for evenly spreading solid seed particles or fertilizer particles, and can also be used for evenly spreading liquid pesticide solutions, thereby improving the practical performance. The spreading mechanism 7 includes a hollow spreading disc 701, a plurality of spreading pipes 702, a driving component, a material control component, and a solution atomization component. The hollow spreading disc 701 is located at the bottom end of the discharge pipe 5. At the central part of the top of the hollow spreading disc 701, an installation hole is opened. The bottom end of the hollow spreading disc 701 passes through the installation hole rotatably through a bearing. The electromagnetic discharge valve 6 is located inside the hollow spreading disc 701. A plurality of spreading pipes 702 are all fixedly installed on the outer side wall of the hollow spreading disc 701, and a plurality of spreading pipes 702 are all connected to the inside of the hollow spreading disc 701. A plurality of spreading pipes 702 are distributed in an equidistant annular shape. The driving component, the control component, and the solution atomization component are all arranged between the material loading box 3 and the hollow spreading disc 701. The driving component is used to control the horizontal rotation of the hollow spreading disc 701. The material control component is used to control the intermittent entry of the materials in the material loading box 3 into the hollow spreading disc 701. The solution atomization component is used to atomize the pesticide solution discharged from the plurality of spreading pipes 702 into a water mist state.

[0033] In this embodiment, a conical guiding seat 703 is fixedly installed on the inner wall of the bottom of the hollow spreading disc 701. The diameter of the conical guiding seat 703 decreases sequentially from bottom to top, which is used to guide the materials entering the hollow spreading disc 701, facilitating the materials to flow more smoothly in the hollow spreading disc 701 towards the direction of the spreading pipes 702, and can ensure that the materials entering the hollow spreading disc 701 are discharged smoothly and completely from the plurality of spreading pipes 702.

[0034] In this embodiment, the above-mentioned driving assembly includes a motor 704, a driving shaft 705, a gear 706 and an external gear ring 707. The motor 704 is fixedly installed at the bottom of the material loading box 3 and is located on the left side of the discharge pipe 5. The driving shaft 705 is fixedly installed at the output shaft end of the motor 704. The gear 706 is fixedly sleeved at the bottom end of the driving shaft 705. The external gear ring 707 is fixedly installed at the top of the hollow spreading disk 701. The bottom end of the discharge pipe 5 penetrates through the external gear ring 707. The external gear ring 707 meshes with the gear 706. By using the motor 704, the driving shaft 705 and the gear 706 can be controlled to rotate. By using the meshing transmission effect between the external gear ring 707 and the gear 706, the hollow spreading disk 701 can be controlled to rotate horizontally. Under the action of the centrifugal force generated by the rotation of the hollow spreading disk 701, the materials discharged from the plurality of spreading pipes 702 can be dispersed in different directions, so as to achieve a wider and more uniform spreading effect, effectively avoiding the concentrated spreading of materials in a certain area. The above-mentioned material control assembly includes a cam 708, a baffle 710, a push plate 711 and a spring 712. The cam 708 is fixedly sleeved on the driving shaft 705 and is located above the gear 706. A through hole 709 is formed on the left side of the discharge pipe 5. The right end of the baffle 710 slides through the through hole 709. The push plate 711 is fixedly installed on the left side of the baffle 710. The cam 708 abuts against the left side wall of the push plate 711. One end of the spring 712 is fixedly connected to the right side wall of the push plate 711, and the other end of the spring 712 is fixedly connected to the outer wall of the discharge pipe 5. The spring 712 is located below the baffle 710. By using the driving shaft 705 to drive the cam 708 to rotate and cooperating with the elastic force of the spring 712, the cam 708 can push the push plate 711 to make the baffle 710 slide horizontally back and forth intermittently in the through hole of the discharge pipe 5. By using the baffle 710, the inside of the discharge pipe 5 can be intermittently blocked, so as to realize the intermittent entry of materials into the hollow spreading disk 701. This design can accurately control the amount of materials spread each time according to actual needs, avoid material waste, and can also more accurately control the spreading range and density. The above-mentioned solution atomization assembly includes a booster air pump 713, an air delivery pipe 714, an electric telescopic rod 715, a connecting plate 716 and an atomization mesh ring 717. The booster air pump 713 is fixedly installed at the bottom of the material loading box 3 and is located on the right side of the discharge pipe 5. The air delivery pipe 714 is fixedly connected to the discharge end of the booster air pump 713. One end of the air delivery pipe 714 extends into the discharge pipe 5 and is located below the baffle 710. The electric telescopic rod 715 is fixedly installed at the bottom of the booster air pump 713. The connecting plate 716 is fixedly installed at the output shaft end of the electric telescopic rod 715. The atomization mesh ring 717 is fixedly installed at the bottom of the connecting plate 716. The top of the hollow spreading disk 701 penetrates through the atomization mesh ring 717. The plurality of spreading pipes 702 are all located below the atomization mesh ring 717. One end of the spreading pipe 702 away from the hollow spreading disk 701 is slidably matched with the inner wall of the atomization mesh ring 717. During the process of spreading the pesticide liquid, by using the high-pressure gas generated by the operation of the booster air pump 713,High-pressure gas is transported into the discharge pipe 5 through the gas transmission pipe 714 and then enters the hollow spreading disc 701, so that when the pesticide liquid is discharged from the plurality of spreading pipes 702, it has a certain flow rate, increasing the spraying range of the pesticide liquid. By utilizing the retractable feature of the electric telescopic rod 715, the vertical movement of the connecting plate 716 and the atomizing mesh ring 717 can be controlled. The atomizing mesh ring 717 enables the pesticide solution discharged from the spreading pipes 702 to be atomized into a water mist state, which can increase the contact area between the pesticide solution and the target area, improve the usage efficiency of the pesticide solution, enable the pesticide solution to cover the area to be treated more evenly, and enhance the prevention and control effect.

[0035] In this embodiment, sealing strips are fixedly installed on the top inner wall and the bottom inner wall of the through hole. The two sealing strips are respectively in sliding sealing contact with the top and the bottom of the baffle 710, which can effectively prevent the material from leaking out through the gap between the baffle 710 and the through hole.

[0036] In this embodiment, a limiting ring 718 is fixedly installed on the inner wall of the atomizing mesh ring 717, which can block and limit the downward stroke of the atomizing mesh ring 717. When the limiting ring 718 moves downward to abut against the spreading pipe 702, at this time, the atomizing mesh ring 717 can block the nozzles of the plurality of spreading pipes 702, and then enable the pesticide solution discharged from the spreading pipes 702 to pass through the mesh holes on the atomizing mesh ring 717 and be sprayed out in a water mist state.

[0037] In this embodiment, a feeding hole is formed in the top of the material loading box 3, and a plug 8 is installed in the feeding hole by internal threading, which is convenient for pouring materials into the material loading box 3.

[0038] In this embodiment, it should be added that the UAV main body 1 is equipped with a remote controller when leaving the factory. The remote controller can be used to remotely control the flight and takeoff and landing of the UAV main body 1. The electromagnetic discharge valve 6, the motor 704, the supercharging air pump 713, and the electric telescopic rod 715 are electrically connected to the internal power supply of the UAV main body 1 through wires. The electromagnetic discharge valve 6, the motor 704, the supercharging air pump 713, and the electric telescopic rod 715 can be respectively controlled to be energized and operated through the switch buttons on the remote controller. Their circuit connection methods and control methods belong to the mature technologies in this field, so they will not be elaborated in this article.

[0039] Through the above structure, the working principle of the payload spreading UAV provided by the present invention is as follows:

[0040] When sowing solid seed particles or fertilizer particles, first, turn the cock 8 in the feeding hole at the top of the material loading box 3 to add the material to be sown (such as seed particles or fertilizer particles) into the material loading box 3. After the addition is completed, tighten the cock 8 again. Then, control the flight of the UAV main body 1 to the area where sowing is required. Next, open the electromagnetic discharge valve 6 and control the operation of the motor 704, keeping the electric telescopic rod 715 in a contracted state so that the atomizing mesh ring 717 does not block the plurality of sowing pipes 702. The seed particles or fertilizer particles in the material loading box 3 enter the hollow sowing disc 701 through the discharge pipe 5 and the electromagnetic discharge valve 6. At this time, drive the drive shaft 705 and the gear 706 to rotate by using the motor 704. Under the meshing drive of the external gear ring 707 and the gear 706, the hollow sowing disc 701 can be controlled to rotate horizontally. Under the action of the centrifugal force generated by the rotation of the hollow sowing disc 701, the seed particles or fertilizer particles discharged from the plurality of sowing pipes 702 can be dispersed in different directions, thus achieving a wider and more uniform sowing effect, effectively avoiding the concentrated sowing of seed particles or fertilizer particles in a certain area. At the same time, drive the cam 708 to rotate by using the drive shaft 705 and cooperate with the elastic force of the spring 712. The cam 708 can push the push plate 711 to make the baffle 710 slide horizontally intermittently in the through hole of the discharge pipe 5. The baffle 710 can be used to intermittently block the inside of the discharge pipe 5, so as to realize the intermittent entry of seed particles or fertilizer particles into the hollow sowing disc 701, and thus accurately control the amount of material sown of seed particles or fertilizer particles, avoid waste of seed particles or fertilizer particles, and at the same time can more accurately control the sowing range and density of seed particles or fertilizer particles. After the sowing operation of seed particles or fertilizer particles is completed, close the electromagnetic discharge valve 6 and the motor 704, and control the UAV main body 1 to fly back;

[0041] When spreading a liquid pesticide solution, first, turn open the cock 8 in the charging hole at the top of the material storage box 3, add the material to be spread (such as a pesticide solution) into the material storage box 3, and then tighten the cock 8 after adding. Then, control the flight of the drone main body 1 to the area where spreading is required. Next, control the electric telescopic rod 715 to extend, and then the connecting plate 716, the atomizing mesh ring 717, and the limiting ring 718 can be controlled to move vertically downward. When the limiting ring 718 abuts against the spreading pipe 702, stop the operation of the electric telescopic rod 715. At this time, the atomizing mesh ring 717 can block the nozzles of multiple spreading pipes 702. Then, open the electromagnetic discharge valve 6 and start the operation of the motor 704 and the booster air pump 713. The pesticide solution in the material storage box 3 flows into the hollow spreading disc 701 through the discharge pipe 5 and the electromagnetic discharge valve 6. By using the motor 704 to drive the drive shaft 705 and the gear 706 to rotate, under the meshing drive of the external gear ring 707 and the gear 706, the horizontal rotation of the hollow spreading disc 701 can be controlled. Under the centrifugal force generated by the rotation of the hollow spreading disc 701, the pesticide solution discharged from multiple spreading pipes 702 can be dispersed in different directions. And the high-pressure gas generated by the operation of the booster air pump 713 is transported into the discharge pipe 5 through the air pipe 714 and then enters the hollow spreading disc 701, so that the pesticide liquid has a certain flow rate when discharged from multiple spreading pipes 702, increasing the spraying range of the liquid pesticide. The pesticide solution discharged from multiple spreading pipes 702 passes through the mesh holes on the atomizing mesh ring 717 and is sprayed out in a water mist state, which can increase the contact area between the pesticide solution and the target area, improve the use efficiency of the pesticide solution, make the pesticide solution cover the area to be treated more evenly, enhance the control effect, and thus achieve a wider and more uniform spreading effect, effectively avoiding the concentrated spreading of the pesticide solution in a certain area. At the same time, by using the drive shaft 705 to drive the cam 708 to rotate and cooperating with the elastic force of the spring 712, the cam 708 can push the push plate 711 to make the baffle 710 slide horizontally back and forth intermittently in the through hole of the discharge pipe 5. The baffle 710 can be used to intermittently block the inside of the discharge pipe 5, so as to realize the intermittent inflow of the pesticide solution into the hollow spreading disc 701, accurately control the amount of the material of the pesticide solution spread, avoid the waste of the pesticide solution, and at the same time can more accurately control the spreading range and density of the pesticide solution. After the spreading operation of the pesticide solution is completed, close the electromagnetic discharge valve 6 and the motor 704, and control the electric telescopic rod 715 to contract and reset, then the connecting plate 716, the atomizing mesh ring 717, and the limiting ring 718 can be controlled to move vertically upward and return to their positions, and then control the drone main body 1 to fly back.

[0042] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded in the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A large-load spreading UAV, characterized in that: It includes a drone body (1), landing brackets (2) are fixedly installed on both sides of the bottom of the drone body (1), a material loading box (3) is arranged below the drone body (1) and is located between the two landing brackets (2), two hanging brackets (4) are fixedly installed on the top of the material loading box (3), and both of the two hanging brackets (4) are detachably and fixedly connected to the bottom of the drone body (1). A discharge pipe (5) is fixedly installed at the middle part of the bottom of the material loading box (3), an electromagnetic discharge valve (6) is fixedly installed at the bottom end of the discharge pipe (5), and a spreading mechanism (7) for evenly spreading the material is arranged at the bottom of the material loading box (3).

2. The large-load spreading unmanned aerial vehicle according to claim 1, characterized in that: The inner wall of the bottom of the material loading box (3) is of an inclined surface structure with a concave middle part.

3. The large-load spreading unmanned aerial vehicle according to claim 1, characterized in that: The spreading mechanism (7) includes a hollow spreading disc (701), a plurality of spreading pipes (702), a driving component, a material control component and a solution atomization component. The hollow spreading disc (701) is located at the bottom end of the discharge pipe (5). An installation hole is formed at the center of the top of the hollow spreading disc (701). The bottom end of the hollow spreading disc (701) rotatably penetrates through the installation hole through a bearing. The electromagnetic discharge valve (6) is located inside the hollow spreading disc (701). A plurality of the spreading pipes (702) are fixedly installed on the outer side wall of the hollow spreading disc (701), and a plurality of the spreading pipes (702) are all communicated with the inside of the hollow spreading disc (701). The plurality of the spreading pipes (702) are distributed in an equidistant annular shape. The driving component, the control component and the solution atomization component are all arranged between the material loading box (3) and the hollow spreading disc (701). The driving component is used to control the horizontal rotation of the hollow spreading disc (701). The material control component is used to control the intermittent entry of the material in the material loading box (3) into the hollow spreading disc (701). The solution atomization component is used to atomize the pesticide solution discharged from the plurality of spreading pipes (702) into a water mist state.

4. The large-load spreading unmanned aerial vehicle according to claim 3, characterized in that: A conical guiding seat (703) is fixedly installed on the inner wall of the bottom of the hollow spreading disc (701), and the diameter dimension of the conical guiding seat (703) gradually decreases from bottom to top.

5. The large-load spreading UAV according to claim 3, characterized in that: The driving component includes a motor (704), a driving shaft (705), a gear (706) and an external gear ring (707). The motor (704) is fixedly installed at the bottom of the material loading box (3) and is located on the left side of the discharge pipe (5). The driving shaft (705) is fixedly installed at the output shaft end of the motor (704). The gear (706) is fixedly sleeved at the bottom end of the driving shaft (705). The external gear ring (707) is fixedly installed at the top of the hollow spreading disc (701). The bottom end of the discharge pipe (5) penetrates through the external gear ring (707), and the external gear ring (707) meshes with the gear (706).

6. The large-load spreading unmanned aerial vehicle according to claim 5, wherein: The material control component includes a cam (708), a baffle (710), a push plate (711) and a spring (712). The cam (708) is fixedly sleeved on the drive shaft (705) and is located above the gear (706). A through hole (709) is formed on the left side of the discharge pipe (5). The right end of the baffle (710) slidably penetrates through the through hole (709). The push plate (711) is fixedly installed on the left side of the baffle (710). The cam (708) abuts against the left side wall of the push plate (711). One end of the spring (712) is fixedly connected to the right side wall of the push plate (711), and the other end of the spring (712) is fixedly connected to the outer wall of the discharge pipe (5). The spring (712) is located below the baffle (710).

7. The large-load spreading unmanned aerial vehicle according to claim 6, characterized in that: Sealing strips are fixedly installed on both the top inner wall and the bottom inner wall of the through hole, and the two sealing strips are respectively in sliding and sealing contact with the top and the bottom of the baffle (710).

8. The large-load spreading unmanned aerial vehicle according to claim 6, characterized in that: The solution atomization component includes a booster air pump (713), an air delivery pipe (714), an electric telescopic rod (715), a connecting plate (716) and an atomization mesh ring (717). The booster air pump (713) is fixedly installed at the bottom of the material loading box (3) and is located on the right side of the discharge pipe (5). The air delivery pipe (714) is fixedly connected to the discharge end of the booster air pump (713). One end of the air delivery pipe (714) extends into the discharge pipe (5) and is located below the baffle (710). The electric telescopic rod (715) is fixedly installed at the bottom of the booster air pump (713). The connecting plate (716) is fixedly installed at the output shaft end of the electric telescopic rod (715). The atomization mesh ring (717) is fixedly installed at the bottom of the connecting plate (716). The top of the hollow spreading disc (701) penetrates through the atomization mesh ring (717). A plurality of spreading pipes (702) are all located below the atomization mesh ring (717). The end of the spreading pipe (702) far away from the hollow spreading disc (701) is in sliding fit with the inner wall of the atomization mesh ring (717).

9. The large-load spreading unmanned aerial vehicle according to claim 8, wherein: A limiting ring (718) is fixedly installed on the inner wall of the atomization mesh ring (717).

10. The large-load spreading unmanned aerial vehicle according to claim 1, wherein: A feeding hole is formed on the top of the material loading box (3), and a plug (8) is installed in the feeding hole by thread.

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