Multi-rotor plant protection unmanned aerial vehicle

Abstract

The invention discloses a multi-rotor plant protection unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles, the multi-rotor plant protection unmanned aerial vehicle comprises a multi-rotor unmanned aerial vehicle, the bottom of the multi-rotor unmanned aerial vehicle is fixedly connected with two connecting columns, the bottoms of the two connecting columns are fixedly connected with a rectangular plate, and the bottom of the rectangular plate is provided with three liquid storage cabins. Through cooperation of parts such as the conical hole, when liquid in the liquid storage tank shakes, the liquid can always penetrate through the direct largest opening of the conical hole and flow out of the direct smallest opening and the round hole, kinetic energy of the liquid level is consumed through the throttling effect of the slit, impact of the liquid level is reduced, and the liquid storage tank is more stable in performance. Meanwhile, due to the fact that the water inlet side is large in hole diameter, liquid is allowed to rapidly flow into the inner side of the conical hole, the instantaneous pressure peak value is reduced, the water outlet side is small in hole diameter, closure damping is formed, liquid outflow is delayed, the impact of the liquid on the liquid storage tank is further reduced, the stability of the device is improved, and the overall practicability of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicles, in particular to a multi-rotor plant protection unmanned aerial vehicle. Background Art

[0002] Plant protection refers to the comprehensive discipline and practical activities of preventing, controlling and managing diseases, insects, weeds, rodents and other harmful organisms that harm plants (including crops, trees, horticultural plants, etc.) through scientific methods and technologies, protecting the healthy growth of plants, and ensuring the production safety of agriculture, forestry and other industries and the sustainable development of the ecological environment. Pests and diseases are the main factors leading to reduced or even total crop yields. According to statistics, the annual crop losses caused by pests and diseases in the world are as high as 20% to 30%, while the use of pesticides can recover 30% to 35% of the losses. When spraying pesticides on large areas of crops, drones are generally used for spraying pesticides;

[0003] When the existing multi-rotor plant protection drones are spraying pesticides in the fields, if the drone flies too fast, it is easy to cause the liquid inside the bottom medicine box to shake greatly. The shaking of the liquid is easy to produce impact force on the medicine box, which makes the drone's flight center of gravity easily shift, affecting the stability of the drone's flight. For this reason, we designed a multi-rotor plant protection drone to solve the above problem. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-rotor plant protection UAV in order to solve the problem that shaking of liquid inside a medicine box easily generates impact force on the medicine box, thereby causing the center of gravity of the UAV to shift easily and affecting the flight stability of the UAV.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a multi-rotor plant protection UAV, comprising: a multi-rotor UAV, the bottom of the multi-rotor UAV is fixedly connected to two connecting columns, the bottom of the two connecting columns is fixedly connected to a rectangular plate, the bottom of the rectangular plate is provided with three liquid storage tanks, the bottom of the rectangular plate is provided with a stability enhancing mechanism, the inner side of the liquid storage tank is provided with a water level constant mechanism and a buffer mechanism, and the bottom of the liquid storage tank is provided with a spray assembly; the stability enhancing mechanism comprises a first connecting plate and two L-shaped plates fixedly connected to the bottom of the rectangular plate, the inner sides of the two L-shaped plates are fixedly connected to a connecting strip, the outer wall of the connecting strip is slidably connected to a sliding plate, one of the liquid storage tanks is fixedly connected to the first connecting plate, and the other two liquid storage tanks are fixedly connected to the sliding plate.

[0006] As a further solution of the present invention: three first connecting pipes are installed at the bottom of the water outlet of one of the liquid storage tanks, three corrugated pipes are installed at the water outlets of the other two liquid storage tanks, and the first connecting pipes are connected to the bottom of the corrugated pipes through second connecting pipes.

[0007] As a further solution of the present invention: the stability enhancing mechanism also includes two first one-way threaded screws rotatably connected to the inner side of the rectangular plate, the outer walls of the two first one-way threaded screws are fixedly connected to pulleys, and a belt is installed on the outer walls of the two pulleys. A first driving motor is installed on the top of the rectangular plate, and the output end of the first driving motor is fixed to the first one-way threaded screw, and the two sliding plates are respectively threadedly connected to the outer wall of a first one-way threaded screw.

[0008] As a further solution of the present invention: the water level constant mechanism includes two collecting plates slidably connected to the inner side of the liquid storage tank, and the size of the collecting plates matches the cross-sectional size of the liquid storage tank, a second drive motor is installed on the inner side of the liquid storage tank, and the output end of the second drive motor is fixedly connected to a bidirectional threaded screw, and the outer wall of the bidirectional threaded screw is provided with positive threads and negative threads, and the two collecting plates are threadedly connected to the positive threads and negative threads respectively.

[0009] As a further solution of the present invention: the buffer mechanism includes two sliding seats slidably connected to the inner side of the liquid storage tank, the bottom of the two sliding seats is fixedly connected to a connecting seat, the inner side of the connecting seat is slidably connected to a spoiler, and a return spring is installed between the spoiler and the inner side of the connecting seat.

[0010] As a further solution of the present invention: the buffer mechanism also includes a plurality of circular holes opened on the inner side of the spoiler, and the plurality of circular holes all penetrate to the outside of the spoiler, a limiting groove is opened on the inner side of the spoiler, a switching plate is slidably connected to the inner side of the limiting groove, two groups of conical holes are opened on the inner side of the switching plate, each group of conical holes is provided with a plurality of holes, and the two groups of conical holes are staggered, and a power assembly is arranged on the top of the switching plate.

[0011] As a further solution of the present invention: the tapered holes are arranged to be tapered, the openings of the two groups of tapered holes are arranged opposite to each other, and the top of the tapered surface of the tapered holes matches the size of the circular holes.

[0012] As a further solution of the present invention: the power assembly includes two fixing seats fixedly connected to the top of the spoiler, the inner sides of the two fixing seats are rotatably connected with a second one-way threaded screw, the top of the switching plate is fixedly connected with a second connecting plate, and the second connecting plate is threadedly connected to the outer wall of the second one-way threaded screw, and the second connecting plate is directly matched with the limiting groove, the top of the connecting seat is fixedly connected with a spur rack, the second one-way threaded screw passes through one end of the fixing seat and is fixedly connected with a spur gear, and the spur gear is meshed with the spur rack.

[0013] As a further solution of the present invention: the liquid spray assembly includes two third connecting tubes fixedly connected to the bottom of the second connecting tube, a medicine cabin is fixedly connected to the bottom of the two third connecting tubes, a fixing plate is fixedly connected to the inner side of the medicine cabin, a suction pump is installed at the bottom of the fixing plate, the output end of the suction pump passes through the bottom of the medicine cabin and is fixedly connected to a fourth connecting tube, and a nozzle is installed at the bottom of the fourth connecting tube.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By arranging the cooperation of parts such as the tapered hole, when the liquid inside the liquid storage tank is shaken, the liquid can always pass through the largest opening of the tapered hole and flow out from the smallest opening and the circular hole, so that the kinetic energy of the liquid surface is consumed through the throttling effect of the slit, thereby reducing the impact of the liquid surface. At the same time, due to the large aperture on the water inlet side, the liquid is allowed to flow quickly into the inner side of the tapered hole, thereby reducing the instantaneous pressure peak. The small aperture on the water outlet side forms a cutoff damping to delay the outflow of the liquid, thereby further reducing the impact of the liquid on the liquid storage tank, thereby improving the stability of the device, thereby improving the overall practicality of the device;

[0016] 2. By setting the cooperation of the first unidirectional threaded screw and other parts, when the multi-rotor UAV is unbalanced during flight, the inertial measurement unit senses that the fuselage is tilted. When the fuselage tilts to the right, the inertial measurement unit sends a signal to the PLC controller, and the PLC controller controls the first drive motor to start. The output end of the first drive motor drives a first unidirectional threaded screw to rotate, thereby driving the sliding plate on the left to move downward, and at the same time drives the pulley on the left to rotate, thereby driving the belt to rotate, so that another first unidirectional threaded screw rotates, thereby driving the sliding plate on the right to move upward, so that the two liquid storage tanks are in the opposite direction of the tilt direction of the multi-rotor UAV, so that the liquid inside the liquid storage tank can flow to the inner side of the liquid storage tank moving downward, thereby changing the center of gravity between the three liquid storage tanks, thereby towing the multi-rotor UAV under the action of gravity, thereby calibrating the tilt of the multi-rotor UAV, thereby improving the stability of the device, thereby improving the overall practicality of the device;

[0017] 3. By setting up the cooperation of parts such as the bidirectional threaded screw and the like, the second drive motor is controlled by the PLC controller, and the second drive motor can be controlled to start intermittently. When the device sprays pesticides on the outside, the pesticides will flow out of the liquid storage tank and finally sprayed to the outside. When the liquid level sensor detects that the liquid level of the pesticide inside the liquid storage tank drops to a certain height, the PLC controller controls the second drive motor to start, thereby driving the bidirectional threaded screw to rotate, thereby driving the two collecting plates to move toward the center position, thereby pushing the liquid inside the two collecting plates to move toward the center position, so that the liquid level is always kept at a constant position when the pesticide is sprayed on the field, thereby eliminating the influence of the liquid consumption on the center of gravity, and at the same time making the liquid level always kept at the center position of the liquid storage tank, thereby further improving the stability of the device, thereby improving the overall practicality of the device;

[0018] 4. By setting up the coordination of parts such as the spoiler, when the liquid surface inside the liquid storage tank shakes, the shaking liquid can pass through the multiple circular holes opened on the inside of the spoiler in sequence, and the liquid is divided into multiple small areas through the multiple circular holes, thereby shortening the wavelength of the liquid fluctuation. At the same time, when the shaking liquid hits the spoiler, the return spring will be squeezed, thereby buffering the shaking liquid, thereby reducing the shaking amplitude of the liquid, reducing the kinetic energy of the liquid, and thus enhancing the flight stability of the multi-rotor UAV. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 is a cross-sectional view of the present invention;

[0021] Figure 3 is a cross-sectional view of the stability enhancement mechanism of the present invention;

[0022] Figure 4 It is a cross-sectional view of the water level constant mechanism of the present invention;

[0023] Figure 5 It is a schematic diagram of the spoiler structure of the present invention;

[0024] Figure 6 is a cross-sectional view of a spoiler of the present invention;

[0025] Figure 7 It is an exploded view of the spoiler and the switching plate parts of the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the switch board of the present invention;

[0027] Fig. 9 It is a schematic diagram of the structure of the liquid spraying assembly of the present invention.

[0028] In the figure: 1. multi-rotor drone; 2. connecting column; 3. rectangular plate; 4. first connecting plate; 5. L-shaped plate; 6. connecting strip; 7. sliding plate; 8. liquid storage tank; 9. first drive motor; 10. first unidirectional threaded screw; 11. pulley; 12. belt; 13. first connecting pipe; 14. bellows; 15. second connecting pipe; 16. collecting plate; 17. second drive motor; 18. bidirectional threaded screw; 19. sliding seat; 20. connecting seat; 21. spoiler; 22. reset spring; 23. switching plate; 24. round hole; 25. conical hole; 26. fixed seat; 27. second unidirectional threaded screw; 28. second connecting plate; 29. ​​spur rack; 30. spur gear; 31. third connecting pipe; 32. medicine cabin; 33. fixing plate; 34. suction pump; 35. fourth connecting pipe; 36. nozzle; 37. limit groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0031] See also Figures 1 to 9The present embodiment provides a multi-rotor plant protection UAV, comprising: a multi-rotor UAV 1, wherein two connecting columns 2 are fixedly connected to the bottom of the multi-rotor UAV 1, a rectangular plate 3 is fixedly connected to the bottom of the two connecting columns 2, three liquid storage tanks 8 are arranged at the bottom of the rectangular plate 3, a stability enhancing mechanism is arranged at the bottom of the rectangular plate 3, a water level constant mechanism and a buffer mechanism are arranged on the inner side of the liquid storage tank 8, and a liquid spraying assembly is arranged at the bottom of the liquid storage tank 8; the stability enhancing mechanism comprises a first connecting plate 4 and two L-shaped plates 5 fixedly connected to the bottom of the rectangular plate 3, a connecting strip 6 is fixedly connected to the inner side of the two L-shaped plates 5, a sliding plate 7 is slidably connected to the outer wall of the connecting strip 6, one of the liquid storage tanks 8 is fixedly connected to the first connecting plate 4, and the other two liquid storage tanks 8 is fixedly connected to the sliding plate 7; three first connecting pipes 13 are installed at the bottom of the water outlet of one liquid storage tank 8, and three bellows 14 are installed at the water outlets of the other two liquid storage tanks 8, and the first connecting pipe 13 is connected to the bottom of the bellows 14 through a second connecting pipe 15; the stability enhancement mechanism also includes two first one-way threaded screws 10 rotatably connected to the inner side of the rectangular plate 3, the outer walls of the two first one-way threaded screws 10 are fixedly connected to pulleys 11, and the outer walls of the two pulleys 11 are installed with a belt 12, a first driving motor 9 is installed on the top of the rectangular plate 3, the output end of the first driving motor 9 is fixed to the first one-way threaded screw 10, and the two sliding plates 7 are respectively threadedly connected to the outer wall of a first one-way threaded screw 10;

[0032] The first drive motor 9 is controlled by a PLC controller, which can control the first drive motor 9 to start intermittently. An inertial measurement unit is arranged on the inner side of the multi-rotor UAV 1, which is composed of a gyroscope and other devices for detecting the tilt angle of the multi-rotor UAV 1 during flight. Since it is a prior art, this solution does not go into too much detail. Through the inertial measurement unit, the posture of the fuselage can be detected and the tilt angle of the fuselage can be felt;

[0033] First, when the multi-rotor UAV 1 is unbalanced during flight, the inertial measurement unit senses that the fuselage is tilted. When the fuselage tilts to the right, the inertial measurement unit sends a signal to the PLC controller, and the PLC controller controls the first drive motor 9 to start. The output end of the first drive motor 9 drives a first unidirectional threaded screw 10 to rotate, thereby driving the sliding plate 7 on the left to move downward, and at the same time drives the pulley 11 on the left to rotate, thereby driving the belt 12 to rotate, so that another first unidirectional threaded screw 10 rotates, thereby driving the sliding plate 7 on the right to move upward, so that the two liquid storage tanks 8 are in the opposite direction to the tilt direction of the multi-rotor UAV 1, so that the liquid inside the liquid storage tank 8 can flow to the inner side of the downward moving liquid storage tank 8, thereby changing the center of gravity between the three liquid storage tanks 8, thereby towing the multi-rotor UAV 1 under the action of gravity, thereby calibrating the tilt of the multi-rotor UAV 1, thereby improving the stability of the device, thereby improving the overall practicality of the device.

[0034] At the same time, the inertial measurement unit senses the inclination angle of the fuselage, thereby controlling the distance that the two liquid storage tanks 8 move upward or downward, thereby accurately controlling the traction force on the multi-rotor drone 1, thereby further improving the practicality of the device.

[0035] See also Figure 2 to Figure 4 The water level constant mechanism includes two collecting plates 16 slidably connected to the inner side of the liquid storage tank 8, and the size of the collecting plates 16 matches the cross-sectional size of the liquid storage tank 8. A second driving motor 17 is installed on the inner side of the liquid storage tank 8. A bidirectional threaded screw 18 is fixedly connected to the output end of the second driving motor 17, and the outer wall of the bidirectional threaded screw 18 is provided with positive threads and negative threads, and the two collecting plates 16 are respectively threadedly connected to the positive threads and the negative threads;

[0036] Each liquid storage tank 8 is equipped with a liquid level sensor for detecting the internal liquid level. Since how the liquid level sensor detects the liquid height inside the liquid storage tank 8 is an existing technology, this solution does not go into too much detail. The second drive motor 17 is controlled by a PLC controller, which can control the second drive motor 17 to start intermittently. When the device sprays pesticides on the outside, the pesticides will flow out of the liquid storage tank 8 and finally spray into the outside. When the liquid level sensor detects that the pesticide liquid level inside the liquid storage tank 8 drops to a certain height, the PLC controller controls the second drive motor 17 to start, thereby driving the bidirectional threaded screw 18 to rotate, thereby driving the two collecting plates 16 to move toward the center position, thereby pushing the liquid inside the two collecting plates 16 to move toward the center position, so that the liquid level position is always maintained at a constant position when the pesticide is sprayed on the field, thereby eliminating the influence of liquid consumption on the center of gravity, and at the same time making the liquid level always maintained at the center position of the liquid storage tank 8, thereby further improving the stability of the device, thereby improving the overall practicality of the device.

[0037] See also Figures 4 to 8 The buffer mechanism includes two sliding seats 19 slidably connected to the inner side of the liquid storage tank 8, and the bottoms of the two sliding seats 19 are fixedly connected to a connecting seat 20, and the inner side of the connecting seat 20 is slidably connected to a spoiler 21, and a return spring 22 is installed between the spoiler 21 and the inner side of the connecting seat 20; the buffer mechanism also includes a plurality of circular holes 24 opened on the inner side of the spoiler 21, and the plurality of circular holes 24 all penetrate to the outside of the spoiler 21, and a limiting groove 37 is opened on the inner side of the spoiler 21, and a switching plate 23 is slidably connected to the inner side of the limiting groove 37, and two groups of conical holes 25 are opened on the inner side of the switching plate 23, and each group of conical holes 25 is provided with a plurality of conical holes, and the two groups of conical holes 25 are staggered, and the top of the switching plate 23 is provided with There is a power assembly; the openings of the two groups of tapered holes 25 are arranged oppositely, and the top of the tapered surface of the tapered hole 25 matches the size of the circular hole 24; the power assembly includes two fixed seats 26 fixedly connected to the top of the spoiler 21, and the inner sides of the two fixed seats 26 are rotatably connected with the second one-way threaded screw 27, the top of the switching plate 23 is fixedly connected with the second connecting plate 28, and the second connecting plate 28 is threadedly connected to the outer wall of the second one-way threaded screw 27, and the second connecting plate 28 is directly matched with the limiting groove 37, the top of the connecting seat 20 is fixedly connected with a spur rack 29, and the second one-way threaded screw 27 passes through one end of the fixed seat 26 and is fixedly connected with a spur gear 30, and the spur gear 30 is meshed with the spur rack 29;

[0038] The top of the sliding seat 19 is fixedly connected with a limit block, and the inner side of the liquid storage tank 8 is provided with a limit slide matching the limit block. The sliding seat 19 is slidably connected with the liquid storage tank 8 through the limit block fixedly connected at the top;

[0039] When the liquid surface inside the liquid storage tank 8 shakes, the shaking liquid can pass through the multiple circular holes 24 opened on the inner side of the spoiler 21 in sequence, and the liquid is divided into multiple small areas by the multiple circular holes 24, thereby shortening the wavelength of the liquid fluctuation. At the same time, when the shaking liquid impacts the spoiler 21, the spoiler 21 moves laterally along the direction of the connecting seat 20, which will cause the return spring 22 to be squeezed, thereby buffering the shaking liquid, thereby reducing the shaking amplitude of the liquid, reducing the kinetic energy of the liquid, and enhancing the flight stability of the multi-rotor drone 1;

[0040] When the liquid surface inside the liquid storage tank 8 shakes with a large amplitude and impacts from the left to the right, the two baffles 21 are pushed to the right by the impact of the liquid inside the liquid storage tank 8, thereby driving the spur gear 30 to rotate, thereby driving the second connecting plate 28 to move along the second unidirectional threaded screw 27, so that the largest opening of a group of tapered holes 25 and the circular hole 24 are aligned, so that the liquid can pass through the largest opening of the tapered hole 25 and flow out from the smallest opening and the circular hole 24, thereby consuming the kinetic energy of the liquid surface through the throttling effect of the slit, thereby reducing the impact of the liquid surface. At the same time, due to the large aperture on the water inlet side, the liquid is allowed to flow quickly into the inner side of the tapered hole 25, thereby reducing the instantaneous pressure peak. The small aperture on the water outlet side forms a cutoff damping, delaying the outflow of liquid, thereby further reducing the impact of the liquid on the liquid storage tank 8, thereby improving the stability of the device, thereby improving the overall practicality of the device;

[0041] At the same time, when the liquid surface inside the liquid storage tank 8 impacts from the right to the left, the second connecting plate 28 is driven to move in the direction under the action of the liquid inside the liquid storage tank 8, so that the opening with the largest diameter of the other group of tapered holes 25 is aligned with the circular hole 24, so that the water always enters from the large aperture of the tapered hole 25 and exits from the small aperture, thereby improving the applicability of the device and thus improving the overall practicality of the device;

[0042] When the switch plate 23 moves to the left or right to the maximum distance, the tapered holes 25 are aligned with the round holes 24, and at the same time, only one group of tapered holes 25 is aligned with the round holes 24, and the other group is in a closed state.

[0043] See also Figure 7 to Figure 9 The liquid spraying assembly includes two third connecting pipes 31 fixedly connected to the bottom of the second connecting pipe 15, a medicine cabin 32 is fixedly connected to the bottom of the two third connecting pipes 31, a fixing plate 33 is fixedly connected to the inner side of the medicine cabin 32, a suction pump 34 is installed at the bottom of the fixing plate 33, and the output end of the suction pump 34 passes through the bottom of the medicine cabin 32 and is fixedly connected to a fourth connecting pipe 35, and a nozzle 36 is installed at the bottom of the fourth connecting pipe 35;

[0044] The suction pump 34 is controlled by a PLC controller, which can control the intermittent start of the suction pump 34. When the multi-rotor drone 1 flies above the farmland and needs to spray the field with medicine, the PLC controller controls the start of the suction pump 34, so that the liquid inside the liquid storage tank 8 is extracted under the action of the suction pump 34 and sprayed into the field through the nozzle 36, thereby improving the spraying efficiency.

[0045] What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-rotor plant protection drone, characterized in that: include: A multi-rotor drone (1), wherein two connecting columns (2) are fixedly connected to the bottom of the multi-rotor drone (1), a rectangular plate (3) is fixedly connected to the bottom of the two connecting columns (2), three liquid storage tanks (8) are arranged at the bottom of the rectangular plate (3), a stability enhancement mechanism is arranged at the bottom of the rectangular plate (3), a water level constant mechanism and a buffer mechanism are arranged on the inner side of the liquid storage tank (8), and a liquid spraying assembly is arranged at the bottom of the liquid storage tank (8); The stability enhancing mechanism comprises a first connecting plate (4) fixedly connected to the bottom of the rectangular plate (3) and two L-shaped plates (5), the inner sides of the two L-shaped plates (5) are fixedly connected to a connecting strip (6), the outer wall of the connecting strip (6) is slidably connected to a sliding plate (7), one of the liquid storage tanks (8) is fixedly connected to the first connecting plate (4), and the other two liquid storage tanks (8) are fixedly connected to the sliding plate (7).

2. A multi-rotor plant protection drone according to claim 1, characterized in that: Three first connecting pipes (13) are installed at the bottom of the water outlet of one of the liquid storage tanks (8), and three corrugated pipes (14) are installed at the water outlets of the other two liquid storage tanks (8), and the first connecting pipes (13) are connected to the bottom of the corrugated pipes (14) through second connecting pipes (15).

3. The multi-rotor plant protection drone according to claim 1, characterized in that: The stability enhancing mechanism also includes two first one-way threaded screws (10) rotatably connected to the inner side of the rectangular plate (3), the outer walls of the two first one-way threaded screws (10) are fixedly connected to pulleys (11), and the outer walls of the two pulleys (11) are equipped with a belt (12), a first driving motor (9) is installed on the top of the rectangular plate (3), the output end of the first driving motor (9) is fixed to the first one-way threaded screw (10), and the two sliding plates (7) are respectively threadedly connected to the outer wall of a first one-way threaded screw (10).

4. The multi-rotor plant protection drone according to claim 3, characterized in that: The water level constant mechanism comprises two collecting plates (16) slidably connected to the inner side of the liquid storage tank (8), and the size of the collecting plates (16) matches the cross-sectional size of the liquid storage tank (8). A second drive motor (17) is installed on the inner side of the liquid storage tank (8), and a bidirectional threaded screw (18) is fixedly connected to the output end of the second drive motor (17), and the outer wall of the bidirectional threaded screw (18) is provided with positive threads and negative threads, and the two collecting plates (16) are respectively threadedly connected to the positive threads and the negative threads.

5. The multi-rotor plant protection UAV according to claim 4, characterized in that: The buffer mechanism comprises two sliding seats (19) slidably connected to the inner side of the liquid storage tank (8), the bottom of each of the two sliding seats (19) is fixedly connected to a connecting seat (20), the inner side of the connecting seat (20) is slidably connected to a spoiler (21), and a return spring (22) is installed between the spoiler (21) and the inner side of the connecting seat (20).

6. The multi-rotor plant protection UAV according to claim 5, characterized in that: The buffer mechanism further comprises a plurality of circular holes (24) formed on the inner side of the spoiler (21), and the plurality of circular holes (24) all penetrate to the outside of the spoiler (21); a limiting groove (37) is formed on the inner side of the spoiler (21); a switching plate (23) is slidably connected to the inner side of the limiting groove (37); two groups of conical holes (25) are formed on the inner side of the switching plate (23); each group of conical holes (25) has a plurality of conical holes; the two groups of conical holes (25) are staggered; and a power assembly is provided on the top of the switching plate (23).

7. The multi-rotor plant protection UAV according to claim 6, characterized in that: The conical holes (25) are arranged in a conical shape, and the openings of the two groups of conical holes (25) are arranged opposite to each other. The top of the conical surface of the conical hole (25) matches the size of the circular hole (24).

8. The multi-rotor plant protection UAV according to claim 6, characterized in that: The power assembly comprises two fixed seats (26) fixedly connected to the top of the spoiler (21), the inner sides of the two fixed seats (26) are rotatably connected to a second one-way threaded screw (27), the top of the switching plate (23) is fixedly connected to a second connecting plate (28), and the second connecting plate (28) is threadedly connected to the outer wall of the second one-way threaded screw (27), and the second connecting plate (28) is directly matched with the limiting groove (37), the top of the connecting seat (20) is fixedly connected to a spur rack (29), and the second one-way threaded screw (27) passes through one end of the fixed seat (26) and is fixedly connected to a spur gear (30), and the spur gear (30) is meshed with the spur rack (29).

9. The multi-rotor plant protection UAV according to claim 2, characterized in that: The liquid spraying assembly comprises two third connecting pipes (31) fixedly connected to the bottom of the second connecting pipe (15); a medicine cabin (32) is fixedly connected to the bottom of the two third connecting pipes (31); a fixing plate (33) is fixedly connected to the inner side of the medicine cabin (32); a suction pump (34) is installed at the bottom of the fixing plate (33); an output end of the suction pump (34) passes through the bottom of the medicine cabin (32) and is fixedly connected to a fourth connecting pipe (35); a nozzle (36) is installed at the bottom of the fourth connecting pipe (35).

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