A three-blade propeller heavy-load tandem unmanned helicopter

Abstract

The embodiment of the application provides a three-blade large-load longitudinal unmanned helicopter, and relates to the technical field of unmanned helicopters. The three-blade large-load longitudinal unmanned helicopter comprises an unmanned helicopter body and a medicine spraying mechanism. The medicine spraying mechanism comprises a water tank, a tank cover, a pump body, a liquid inlet pipe, a liquid outlet pipe, a stirring assembly and a spray head, the tank cover is fixedly arranged on the top of the water tank, the tank cover is installed on the bottom of the unmanned helicopter body, and a water adding pipe and a medicine adding pipe are arranged on the side of the water tank. According to the stirring assembly, the medicine and water in the water tank are rapidly mixed, so that the medicine is rapidly premixed in the water tank, the premixing can be carried out during the flight of the unmanned helicopter body, the premixing speed is improved, and the premixing time is saved. The pump body draws the liquid medicine in the water tank through the liquid inlet pipe, and the liquid medicine enters the spray head through the liquid outlet pipe and is sprayed for crop medicine spraying.

Description

Technical Field

[0001] This application relates to the field of unmanned helicopter technology, and more specifically, to a three-bladed rotor tandem unmanned helicopter with a large payload. Background Technology

[0002] Unmanned helicopters can be used in fields such as agronomy, military, and transportation engineering. In the field of plant protection, tandem unmanned helicopters can be used for pest and disease control spraying. Traditional manual spraying can only cover an average of ten acres per person per day, while a single plant protection unmanned helicopter is more than ten times more efficient than manual spraying, and requires less pesticide while achieving better insecticidal effects.

[0003] The bottom of the plant protection drone is equipped with a liquid mixing tank. When the medicine is added to the tank, it cannot be mixed quickly. In particular, granular medicines need to be manually stirred and mixed before they can be sprayed. Manual mixing is slow and inefficient. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a three-bladed rotor, high-payload tandem unmanned helicopter to solve the problem that when medicines are added to the water tank, they cannot be mixed quickly, especially granular medicines added to the water tank, which require manual stirring and mixing before spraying. Manual mixing is slow and inefficient.

[0005] A three-bladed, high-payload tandem unmanned helicopter according to an embodiment of this application includes: the unmanned helicopter body and a drug spraying mechanism.

[0006] The drug spraying mechanism includes a water tank, a tank cover, a pump body, an inlet pipe, an outlet pipe, a stirring assembly, and a nozzle. The tank cover is fixedly installed on the top of the water tank and is also installed on the bottom of the unmanned helicopter body. A water inlet pipe and a drug inlet pipe are respectively provided on one side of the water tank. The stirring assembly is installed inside the water tank. The pump body is installed above the tank cover. The top end of the inlet pipe is connected to the inlet port of the pump body, and the bottom end of the inlet pipe extends through into the interior of the water tank. The nozzle is located at the bottom of the water tank. One end of the outlet pipe is connected to the outlet port of the pump body, and the other end of the outlet pipe is connected to the nozzle.

[0007] In some embodiments of this application, the unmanned helicopter body includes a helicopter body, a support frame, a rotor assembly, and rotor blades. The support frame is fixedly disposed at the bottom of the helicopter body, the rotor assembly is mounted on the top shaft end of the helicopter body, and one end of each of the three rotor blades is connected to the rotor assembly.

[0008] In some embodiments of this application, the rotor assembly includes a three-rotor hub, a rotor head clamp, and a rotor clamp. The three-rotor hub is fixedly installed on the top shaft end of the helicopter body. One end of each of the three rotor head clamps is connected to the three-rotor hub, and the rotor clamp is fixedly disposed on the other end of the rotor head clamp.

[0009] In some embodiments of this application, the propeller assembly further includes a hub damping block disposed inside the propeller clamp.

[0010] In some embodiments of this application, the support frame includes a support crossbar and a support upright. The two support crossbars are respectively fixedly disposed on both sides of the bottom of the helicopter body, and the top ends of the two support uprights are respectively fixedly connected to the lower ends of the support crossbars.

[0011] In some embodiments of this application, the unmanned helicopter body further includes a moving wheel, which is mounted on the bottom end of the support pole.

[0012] In some embodiments of this application, the stirring assembly includes a motor, a drive shaft, and stirring blades. The motor is mounted on the top of the housing cover, the top end of the drive shaft rotatably passes through the housing cover, and the top end of the drive shaft is fixedly connected to the output shaft end of the motor. The two stirring blades are respectively arranged opposite to each other and fixedly connected to the outer wall of the drive shaft.

[0013] In some embodiments of this application, the stirring assembly further includes a scraper, which is fixedly connected to the bottom of the stirring blade.

[0014] In some embodiments of this application, a valve is provided on the outside of the water supply pipe.

[0015] In some embodiments of this application, the top of the dosing tube has a conical structure, and the top of the dosing tube is provided with an end cap.

[0016] In the aforementioned three-bladed, high-payload tandem unmanned helicopter, the nozzles are directly mounted on the bottom of the helicopter body, and the area covered by the sprayed liquid is relatively small.

[0017] In some embodiments of this application, the drug spraying mechanism further includes a folded pipe fitting, which includes a liquid outlet horizontal pipe, a folded section pipe, a connecting hose, and a sealing cap. The liquid outlet horizontal pipe is fixedly disposed at the bottom of the water tank, and the bottom end of the liquid outlet pipe is connected to the liquid outlet horizontal pipe. Two folded section pipes are respectively located on both sides below the water tank. One end of each of the two connecting hoses is connected to both ends of the liquid outlet horizontal pipe, and the other end of each of the two connecting hoses is connected to the ends of the two folded section pipes near the liquid outlet horizontal pipe. The sealing cap is sealed at the end of the folded section pipe away from the connecting hose. A plurality of nozzles are equidistantly connected and installed below the liquid outlet horizontal pipe and the folded section pipe.

[0018] In some embodiments of this application, the drug spraying mechanism further includes a folding support mechanism. The folding support mechanism includes an electric push rod, a support base, a connecting rod, a sleeve, and a connecting seat. The electric push rod is installed at the bottom of the water tank. The support base is fixedly disposed at the output rod end of the electric push rod. One end of each of the two connecting rods is rotatably connected to the support base. The two sleeves are fixedly sleeved on the outside of the folding section tube. The connecting seat is fixedly connected to the outer wall of the sleeve, and the end of the connecting rod away from the support base is rotatably connected to the connecting seat.

[0019] The pump body draws the mixed pesticide solution from the water tank through the inlet pipe, and then enters the folded pipe fitting through the outlet pipe, where the mixed pesticide solution enters the outlet horizontal pipe and the folded section pipe. Nozzles at the bottom of the outlet horizontal pipe and the folded section pipe spray the pesticide solution. The outlet horizontal pipe and the folded section pipe extend the spraying length of the pesticide solution. The outlet horizontal pipe, the folded section pipe, and the connecting hose form a horizontal and vertical pipe fitting. Several nozzles at the bottom spray the pesticide solution simultaneously, increasing the coverage area of ​​the pesticide, thus increasing the area that the unmanned helicopter can cover during aerial spraying and improving the efficiency and speed of pesticide spraying on crops.

[0020] When the unmanned helicopter is not performing aerial spraying operations, the output rod of the electric push rod drives the support seat to move inward and retract. The retracted support seat drives the connecting rod to move, and the moving connecting rod drives the connecting seat and sleeve at the end to move. This causes the folded tubes at both ends of the connecting rod to rotate around the connecting hose, so that the two folded tubes at both ends are finally rolled up at the bottom of the water tank, reducing the extension length of the folded tubes and preventing the folded tubes from extending to the outside of the water tank and colliding.

[0021] Once the unmanned helicopter is in flight, the support base can be moved by controlling the output rod of the electric push rod. The moving support base drives the connecting rod to move the connecting seat and the sleeve, which in turn causes the sleeve to push the folded sections at both ends of the liquid outlet horizontal pipe to unfold around the connecting hose. Ultimately, this brings the liquid outlet horizontal pipe, folded sections, and connecting hose to a nearly straight, extended position, maximizing their extension. This allows the nozzles at the bottom of the liquid outlet horizontal pipe and folded sections to unfold, increasing the spraying area and improving the efficiency and speed of the unmanned helicopter spraying pesticides onto crops.

[0022] The power for spraying liquid from the nozzles in the aforementioned three-bladed, high-payload tandem unmanned helicopter mainly comes from the pump. If the pump power is too high in order for the nozzles to spray liquid more effectively, it will consume a lot of the unmanned helicopter's electrical energy, making it difficult for the unmanned helicopter to carry out liquid spraying operations in the air for a long time.

[0023] In some embodiments of this application, a first one-way valve is provided on the liquid outlet pipe.

[0024] The three-bladed rotor heavy-duty tandem unmanned helicopter also includes an airflow guiding mechanism. Two sets of the airflow guiding mechanism are provided, and the two sets of the airflow guiding mechanism are respectively located on the front of the water tank. The airflow guiding mechanism includes a guide shroud, a fixing frame, and a guide pipe. The fixing frame is fixedly installed on the front of the water tank, the guide shroud is fixedly installed on the side of the fixing frame away from the water tank, one end of the guide pipe is connected to the guide shroud, and the other end of the guide pipe is connected to the liquid outlet pipe. A second one-way valve is provided on the guide pipe.

[0025] In some embodiments of this application, the air guiding mechanism further includes a filter plate, which is fixedly disposed at the air inlet of the air guide shroud.

[0026] When the unmanned helicopter is spraying pesticides, the front of the water tank experiences significant wind resistance. Air blowing towards the front of the tank enters the airflow guide within the airflow deflector. The air collected inside the deflector, under wind resistance, passes through the guide pipe and the second one-way valve into the outlet pipe. The mixed pesticide solution inside the outlet pipe, after passing through the first one-way valve, mixes and pressurizes with the air entering from the guide pipe, increasing the pressure of the mixed pesticide solution sprayed from the nozzles at the bottom of the outlet horizontal pipe and the folded section pipe. Even if the pump itself has limited power and cannot provide sufficient water pressure to the nozzles, the air pressure entering from the guide pipe compensates for this, ensuring that the mixed pesticide solution sprayed from the nozzles is well dispersed and effectively applied. This also saves the unmanned helicopter's energy, allowing it to continuously spray pesticides in the air for longer periods.

[0027] The air collected by the air guide shroud enters the liquid outlet pipe through the air guide tube and mixes with the liquid medicine inside the outlet pipe. This air-impact mixing of the liquid medicine allows the medicine to be more evenly dispersed and sprayed from multiple nozzles. The filter screen prevents mosquitoes and other insects from entering the air guide shroud.

[0028] The beneficial effects of this application are as follows: The three-bladed rotor, large-payload tandem unmanned helicopter designed in this application allows for the pre-filling of clean water into the water tank via a water inlet pipe, and the addition of chemicals into the water tank via a chemical dosing pipe. The stirring assembly rapidly mixes the chemicals and water in the tank, enabling rapid premixing of the chemicals within the tank. Premixing can also occur while the unmanned helicopter is in flight, improving premixing speed and saving premixing time. The pump body draws the chemical solution from the water tank through an inlet pipe and sprays it out through an outlet pipe to the nozzle for agricultural pesticide spraying.

[0029] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a three-bladed, high-payload tandem unmanned helicopter structure according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the support frame structure according to an embodiment of this application;

[0033] Figure 3 The schematic diagrams of the drug spraying mechanism and air guiding mechanism according to the embodiments of this application are transferred.

[0034] Figure 4 This is a schematic diagram of the structure of the drug spraying mechanism and air guiding mechanism according to embodiments of this application. Figure 2 ;

[0035] Figure 5 This is a schematic diagram of the stirring assembly structure according to an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the folding support mechanism structure according to an embodiment of this application;

[0037] Figure 7This is a schematic diagram of the airflow guiding mechanism according to an embodiment of this application;

[0038] Figure 8 This is a schematic diagram of an airflow guiding mechanism without a filter plate according to an embodiment of this application.

[0039] icon:

[0040] 10-Unmanned helicopter body; 110-Helicopter main body; 120-Support frame; 121-Support crossbar; 122-Support upright; 130-Propeller head assembly; 131-Three-propeller hub; 132-Propeller head clamp; 133-Propeller clamp; 134-Propeller hub shock absorber; 140-Propeller blade; 150-Moving wheel; 20-Drug spraying mechanism; 210-Water tank; 211-Water filling pipe; 212-Drug filling pipe; 220-Tank cover; 230-Pump body; 240-Inlet pipe; 250-Outlet pipe; 251-First check valve; 260-Agitator Mixing assembly; 261-Motor; 262-Agitator blade; 263-Drive shaft; 264-Scraper; 270-Folded pipe fitting; 271-Discharge horizontal pipe; 272-Folded section pipe; 273-Connecting hose; 274-Sealing cap; 280-Nozzle; 290-Folded support mechanism; 291-Electric push rod; 292-Support base; 293-Connecting rod; 294-Sleeve; 295-Connecting base; 40-Air guide mechanism; 410-Guide hood; 420-Fixed frame; 430-Guide pipe; 431-Second one-way valve; 440-Filter screen plate. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0044] The following description, with reference to the accompanying drawings, describes a three-bladed, high-payload tandem unmanned helicopter according to an embodiment of this application.

[0045] Please see Figures 1-8 According to an embodiment of this application, a three-bladed rotor tandem unmanned helicopter with a large payload includes: an unmanned helicopter body 10 and a drug spraying mechanism 20.

[0046] The drug spraying mechanism 20 is located at the bottom of the unmanned helicopter body 10. The drug spraying mechanism 20 can mix the medicine inside the water tank 210 at the same time as the unmanned helicopter body 10 ascends and flies, reducing the extra mixing time and being more efficient and faster than the traditional manual mixing.

[0047] Please see Figure 3 The drug spraying mechanism 20 includes a water tank 210, a tank cover 220, a pump body 230, an inlet pipe 240, an outlet pipe 250, a stirring assembly 260, and a nozzle 280. The tank cover 220 is fixedly mounted on the top of the water tank 210 and is also installed on the bottom of the unmanned helicopter body 10. A water inlet pipe 211 and a drug inlet pipe 212 are respectively provided on one side of the water tank 210. The stirring assembly 260 is installed inside the water tank 210. The pump body 230 is installed above the tank cover 220. The top end of the inlet pipe 240 is connected to the inlet port of the pump body 230, and the bottom end of the inlet pipe 240 extends into the water tank 210. The nozzle 280 is located at the bottom of the water tank 210. One end of the outlet pipe 250 is connected to the outlet port of the pump body 230, and the other end of the outlet pipe 250 is connected to the nozzle 280.

[0048] Clean water is pre-filled into the water tank 210 via the water inlet pipe 211, and chemicals are added into the water tank 210 via the chemical dosing pipe 212. The stirring component 260 rapidly mixes the chemicals and water inside the water tank 210, allowing the chemicals to be pre-mixed quickly within the water tank 210. Pre-mixing can also be performed while the unmanned helicopter 10 is in flight, which not only improves the pre-mixing speed but also saves pre-mixing time. The pump body 230 draws the chemical solution from the water tank 210 through the inlet pipe 240 and sprays it out through the outlet pipe 250 into the nozzle 280 for spraying pesticides on crops.

[0049] In some embodiments of this application, please refer to Figure 1 and Figure 2The unmanned helicopter body 10 includes a helicopter body 110, a support frame 120, a rotor head assembly 130, and rotor blades 140. The support frame 120 is fixedly mounted at the bottom of the helicopter body 110, and the rotor head assembly 130 is mounted on the top shaft end of the helicopter body 110. One end of each of the three rotor blades 140 is connected to the rotor head assembly 130. The rotor head assembly 130 includes a three-rotor hub head 131, a rotor head clamp 132, and a rotor clamp 133. The three-rotor hub head 131 is fixedly mounted on the top shaft end of the helicopter body 110, one end of each of the three rotor head clamps 132 is connected to the three-rotor hub head 131, and the rotor clamp 133 is fixedly mounted on the other end of the rotor head clamp 132. The rotor head assembly 130 also includes a rotor hub damping block 134, which is disposed inside the rotor head clamp 132. Compared to a two-bladed propeller, the design of the three-bladed rotor hub 131, rotor head clamp 132, rotor clamp 133, and rotor hub damping block 134 in the rotor head assembly 130 allows for a larger load capacity. This three-bladed rotor design reduces the rotor diameter, lowers the takeoff and landing area, increases operational lift, and makes the overall structure more compact. The three-bladed rotor hub 131 uses a semi-rigid material, which offers advantages over a fully articulated design in terms of simplicity, reliability, and good control characteristics.

[0050] In some embodiments of this application, please refer to Figure 1 The support frame 120 includes a support crossbar 121 and a support upright 122. The two support crossbars 121 are fixedly mounted on both sides of the bottom of the helicopter body 110, and are bolted together. The top ends of the two support uprights 122 are fixedly connected to the lower ends of the support crossbars 121, and the support uprights 122 and support crossbars 121 are welded together. The unmanned helicopter body 10 also includes casters 150, which are mounted on the bottom of the support uprights 122. The support uprights 122 support the casters 150, and are bolted together with the water tank 210.

[0051] In some embodiments of this application, please refer to Figure 5The stirring assembly 260 includes a motor 261, a drive shaft 263, and stirring blades 262. The motor 261 is mounted on the top of the tank cover 220. The top end of the drive shaft 263 rotates through the tank cover 220 and is fixedly connected to the output shaft of the motor 261. Two stirring blades 262 are respectively and fixedly connected to the outer wall of the drive shaft 263, and the stirring blades 262 and the drive shaft 263 are fixed together by welding. The stirring assembly 260 also includes a scraper 264, which is fixedly connected to the bottom of the stirring blades 262. The output shaft of the motor 261 in the stirring assembly 260 drives the drive shaft 263 to rotate, and the rotating drive shaft 263 drives the two stirring blades 262 to rotate, rapidly mixing the water and chemicals inside the water tank 210. The distance between the scraper 264 at the bottom of the stirring blade 262 and the bottom wall of the water tank 210 is between 1mm and 3mm. When particulate medicine falls into the water tank 210, it can quickly mix the medicine that has settled to the bottom in time, even if sedimentation occurs.

[0052] In some embodiments of this application, please refer to Figure 3 The water supply pipe 211 is equipped with a valve on the outside. Opening the valve allows water to be injected into the water tank 210 through the water supply pipe 211. The top of the dosing pipe 212 is conical, and the top of the dosing pipe 212 is equipped with an end cap. Opening the end cap allows medicine to be added into the dosing pipe 212.

[0053] In the aforementioned three-bladed rotor heavy-duty tandem unmanned helicopter, the nozzle 280 is directly installed at the bottom of the unmanned helicopter body 10, and the liquid sprayed by the nozzle 280 covers a relatively small area.

[0054] In some embodiments of this application, please refer to Figure 3 , Figure 4 and Figure 6The drug spraying mechanism 20 also includes a folded pipe fitting 270, which includes a horizontal outlet pipe 271, folded section pipes 272, connecting hoses 273, and a sealing cap 274. The horizontal outlet pipe 271 is fixedly installed at the bottom of the water tank 210, and the bottom end of the outlet pipe 250 is connected to the horizontal outlet pipe 271. Two folded section pipes 272 are located on both sides below the water tank 210. One end of each of the two connecting hoses 273 is connected to both ends of the horizontal outlet pipe 271, and the other end of each connecting hose 273 is connected to the end of each folded section pipe 272 near the horizontal outlet pipe 271. The sealing cap 274 is sealed at the end of the folded section pipe 272 away from the connecting hose 273, and the sealing cap 274 and the folded section pipe 272 are fixed together by welding. Several nozzles 280 are installed equidistantly below the horizontal outlet pipe 271 and the folded section pipes 272. The drug spraying mechanism 20 also includes a folding support mechanism 290, which includes an electric push rod 291, a support base 292, a connecting rod 293, a sleeve 294, and a connecting seat 295. The electric push rod 291 is installed at the bottom of the water tank 210, and the support base 292 is fixedly installed at the output rod end of the electric push rod 291. The support base 292 and the output rod end of the electric push rod 291 are fixed together by bolts. One end of each of the two connecting rods 293 is rotatably connected to the support base 292, that is, a rotating pin is provided between the connecting rod 293 and the support base 292. Two sleeves 294 are respectively fixedly sleeved on the outside of the folded section tube 272, and the sleeves 294 and the folded section tube 272 are fixed together by bolts; the connecting seat 295 is fixedly connected to the outer wall of the sleeve 294, and the connecting seat 295 and the sleeve 294 are integrally formed; and the end of the connecting rod 293 away from the support seat 292 is rotatably connected to the connecting seat 295; the connecting rod 293 and the connecting seat 295 are rotatably connected by a pin.

[0055] Pump body 230 draws mixed pesticide solution from inside water tank 210 through inlet pipe 240, and enters the folded pipe fitting 270 through outlet pipe 250, that is, the mixed pesticide solution enters the outlet horizontal pipe 271 and folded section pipe 272. The nozzles 280 at the bottom of outlet horizontal pipe 271 and folded section pipe 272 can spray pesticide solution. The outlet horizontal pipe 271 and folded section pipe 272 extend the spraying length of pesticide solution. The outlet horizontal pipe 271, folded section pipe 272 and connecting hose 273 form a horizontal and vertical pipe fitting. Several nozzles 280 at the bottom spray pesticide solution simultaneously, increasing the coverage area of ​​the pesticide, that is, increasing the area of ​​the unmanned helicopter when spraying pesticides in flight, and improving the efficiency and speed of pesticide spraying on crops.

[0056] When the unmanned helicopter body 10 is not performing aerial spraying operations, the output rod end of the electric push rod 291 drives the support seat 292 to move inward and retract. The retracted support seat 292 drives the connecting rod 293 to move. The moving connecting rod 293 drives the end connecting seat 295 and sleeve 294 to move, that is, it drives the folded tubes 272 at both ends of the connecting rod 293 to rotate around the connecting hose 273. Finally, the two folded tubes 272 at both ends are rolled up at the bottom of the water tank 210, reducing the extension length of the folded tubes 272 and preventing the folded tubes 272 from extending to the outside of the water tank 210 and colliding.

[0057] Once the unmanned helicopter body 10 is in flight, the output rod end of the electric push rod 291 can be controlled to push the support base 292 to move. The moving support base 292 drives the connecting rod 293 to push the connecting seat 295 and the sleeve 294 to move. That is, the sleeve 294 drives the folded sections 272 at both ends of the liquid outlet horizontal pipe 271 to unfold around the connecting hose 273. Ultimately, the liquid outlet horizontal pipe 271, the folded sections 272 and the connecting hose 273 are in a stretched and nearly straight position, so that the liquid outlet horizontal pipe 271, the folded sections 272 and the connecting hose 273 can be stretched to the maximum extent. This allows the several nozzles 280 at the bottom of the liquid outlet horizontal pipe 271 and the folded sections 272 to unfold, increasing the spraying area and improving the efficiency and speed of the unmanned helicopter spraying liquid onto crops.

[0058] The power for spraying liquid from the nozzle 280 in the aforementioned three-bladed, high-payload tandem unmanned helicopter mainly comes from the pump body 230. If the pump body 230 has too much power, it will consume too much of the unmanned helicopter's electrical energy, making it difficult for the unmanned helicopter to carry out liquid spraying operations in the air for a long time.

[0059] In some embodiments of this application, please refer to Figure 7 and Figure 8 A first one-way valve 251 is installed on the liquid outlet pipe 250. This three-bladed, high-payload tandem unmanned helicopter also includes an airflow guiding mechanism 40. Two sets of airflow guiding mechanisms 40 are provided, each located on the front of the water tank 210. Each airflow guiding mechanism 40 includes a guide shield 410, a mounting bracket 420, and a guide pipe 430. The mounting bracket 420 is fixedly installed on the front of the water tank 210, and the mounting bracket 420 and the water tank 210 are fixed together with bolts. The guide shield 410 is fixedly installed on the side of the mounting bracket 420 away from the water tank 210, and the guide shield 410 and the mounting bracket 420 are fixed together with bolts. One end of the guide pipe 430 is connected to the guide shield 410, and the other end of the guide pipe 430 is connected to the liquid outlet pipe 250. A second one-way valve 431 is installed on the guide pipe 430. The airflow guiding mechanism 40 also includes a filter plate 440, which is fixedly installed at the air inlet of the airflow guide 410; the filter plate 440 and the airflow guide 410 are fixed together by bolts.

[0060] When the unmanned helicopter is flying to spray pesticides, the front of the water tank 210 experiences significant wind resistance. Air blowing towards the front of the water tank 210 enters the air guide shroud 410 within the air guide mechanism 40. The air collected inside the air guide shroud 410, under wind resistance, passes through the guide pipe 430 and the second one-way valve 431 into the outlet pipe 250. After passing through the first one-way valve 251, the mixed pesticide solution inside the outlet pipe 250 mixes and pressurizes with the air entering from the guide pipe 430, increasing the pressure of the mixed pesticide solution sprayed from the nozzle 280 at the bottom of the outlet horizontal pipe 271 and the folded section pipe 272. Even if the pump body 230 itself has relatively low power and cannot provide sufficient water pressure to the nozzle 280, the air pressure entering from the guide pipe 430 compensates for this, ensuring that the mixed pesticide solution sprayed from the nozzle 280 is well dispersed and sprayed. This also saves the unmanned helicopter's energy, allowing it to continuously spray pesticides in the air for longer periods.

[0061] The air collected by the deflector 410 enters the liquid outlet pipe 250 through the deflector pipe 430 and mixes with the liquid medicine inside the liquid outlet pipe 250. This air-impact mixing of the liquid medicine allows the medicine in the liquid medicine to be more evenly dispersed and sprayed out from multiple nozzles 280. The filter plate 440 prevents mosquitoes in the air from entering the deflector 410.

[0062] It should be noted that the specific models and specifications of the pump body 230, motor 261, and electric actuator 291 need to be selected and determined based on the actual specifications of the device. The specific selection calculation method adopts existing technology in this field, and therefore will not be described in detail. The pump body 230, motor 261, and electric actuator 291 are connected to and controlled by the control system inside the unmanned helicopter, and the power supply is the power source inside the unmanned helicopter. The power supply and principle of the pump body 230, motor 261, and electric actuator 291 are clear to those skilled in the art, and will not be described in detail here.

[0063] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A three-bladed, high-payload tandem unmanned helicopter, characterized in that, include: Unmanned helicopter body (10); The drug spraying mechanism (20) includes a water tank (210), a tank cover (220), a pump body (230), an inlet pipe (240), an outlet pipe (250), a stirring assembly (260), and a nozzle (280). The tank cover (220) is fixedly installed on the top of the water tank (210) and installed on the bottom of the unmanned helicopter body (10). A water inlet pipe (211) and a drug inlet pipe (212) are respectively provided on one side of the water tank (210). The stirring assembly (230) is... 60) Installed inside the water tank (210), the pump body (230) is installed above the tank cover (220), the top end of the inlet pipe (240) is connected to the inlet port of the pump body (230), and the bottom end of the inlet pipe (240) extends through into the water tank (210), the nozzle (280) is located at the bottom of the water tank (210), one end of the outlet pipe (250) is connected to the outlet port of the pump body (230), and the other end of the outlet pipe (250) is connected to the nozzle (280). An air guiding mechanism (40) is provided in two sets, and the two sets of air guiding mechanisms (40) are respectively located on the front of the water tank (210). The air guiding mechanism (40) includes a guide hood (410), a fixing frame (420) and a guide pipe (430). The fixing frame (420) is fixedly installed on the front of the water tank (210). The guide hood (410) is fixedly installed on the side of the fixing frame (420) away from the water tank (210). One end of the guide pipe (430) is connected to the guide hood (410), and the other end of the guide pipe (430) is connected to the liquid outlet pipe (250). A second one-way valve (431) is provided on the guide pipe (430). The air guiding mechanism (40) also includes a filter plate (440). The filter plate (440) is fixedly installed at the air inlet of the guide hood (410). The air collected by the deflector (410) enters the liquid outlet (250) through the deflector tube (430) and mixes with the liquid inside the liquid outlet (250), so that the medicine in the liquid can be more dispersed and evenly sprayed out from multiple nozzles (280). The filter plate (440) is to prevent mosquitoes in the air from entering the deflector (410).

2. The three-bladed rotor, high-payload tandem unmanned helicopter according to claim 1, characterized in that, The unmanned helicopter body (10) includes a helicopter body (110), a support frame (120), a rotor head assembly (130), and rotor blades (140). The support frame (120) is fixedly installed at the bottom of the helicopter body (110), and the rotor head assembly (130) is installed at the top shaft end of the helicopter body (110). One end of each of the three rotor blades (140) is connected to the rotor head assembly (130).

3. The three-bladed rotor, high-payload tandem unmanned helicopter according to claim 2, characterized in that, The rotor assembly (130) includes a three-rotor hub (131), a rotor clamp (132), and a rotor clip (133). The three-rotor hub (131) is fixedly installed on the top shaft end of the helicopter body (110). One end of each of the three rotor clamps (132) is connected to the three-rotor hub (131), and the rotor clip (133) is fixedly disposed on the other end of the rotor clamp (132).

4. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 3, characterized in that, The propeller head assembly (130) also includes a hub damping block (134), which is disposed inside the propeller head clamp (132).

5. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 2, characterized in that, The support frame (120) includes a support crossbar (121) and a support upright (122). The two support crossbars (121) are respectively fixedly installed on both sides of the bottom of the helicopter body (110), and the top ends of the two support uprights (122) are respectively fixedly connected to the bottom ends of the support crossbars (121).

6. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 5, characterized in that, The unmanned helicopter body (10) also includes a moving wheel (150), which is installed at the bottom of the support pole (122).

7. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 1, characterized in that, The stirring assembly (260) includes a motor (261), a drive shaft (263), and stirring blades (262). The motor (261) is mounted on the top of the cover (220). The top end of the drive shaft (263) rotates through the cover (220), and the top end of the drive shaft (263) is fixedly connected to the output shaft end of the motor (261). The two stirring blades (262) are respectively arranged opposite to each other and fixedly connected to the outer wall of the drive shaft (263).

8. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 7, characterized in that, The stirring assembly (260) also includes a scraper (264), which is fixedly connected to the bottom of the stirring blade (262).

9. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 1, characterized in that, A valve is installed on the outside of the water supply pipe (211).

10. A three-bladed rotor, high-payload tandem unmanned helicopter according to claim 1, characterized in that, The top of the dosing tube (212) is tapered, and an end cap is provided on the top of the dosing tube (212).

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