Unmanned aerial vehicle powder and liquid spraying device and unmanned aerial vehicle

Abstract

The utility model relates to an unmanned aerial vehicle powder and liquid spraying device and an unmanned aerial vehicle, belongs to the technical field of unmanned aerial vehicles, and solves the problem that the use range of an unmanned aerial vehicle spraying device is limited as the unmanned aerial vehicle spraying device cannot be used for spraying medicine liquid and spraying powder. The device comprises a material box unit, a fan and a spraying unit, the material box unit comprises a material box, and the material box comprises a material area and a cavity area; the spraying unit comprises a pressurizing projecting disc; a first conical structure is arranged in the middle of the end face of the pressurizing projecting disc; a first airflow channel is arranged between the fan and the cavity area, and forms positive air pressure in the cavity area under the action of high-speed airflow; a second airflow channel is arranged between the fan and the first conical structure, and the second airflow channel forms a negative pressure area in the first conical structure under high-speed airflow; and a material discharging hole is formed in the negative pressure area. The unmanned aerial vehicle powder spraying device can be used for spraying liquid and powder on the unmanned aerial vehicle, the powder spraying effect is good, and the pipeline is not prone to being blocked.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a UAV powder and liquid spraying device and a UAV. Background Art

[0002] With the continuous development of science and technology, drone-based dusting and spraying technology has overcome terrain limitations, enabling efficient coverage of large areas of farmland and gaining widespread application. In existing technologies, liquid pesticides are often transported through pipelines and atomized and ejected using a spray disc due to their good flowability. Powders, on the other hand, have poor flowability and significant friction between particles, making pipelines prone to clogging and often requiring specialized powder delivery devices. Because dusting and liquid spraying operate on different principles, drone dusting devices are generally unsuitable for liquid spraying, and vice versa, limiting the application range of drone spraying systems. Utility Model Content

[0003] Based on the above analysis, the present invention aims to provide a drone powder and liquid spraying device and a drone, in order to solve the problem that the drone spraying device cannot be used for both spraying liquid and powder, which limits the scope of application of the drone spraying device.

[0004] The objective of this utility model is mainly achieved through the following technical solutions:

[0005] One aspect of this utility model is to provide a drone powder and liquid spraying device, including a material bin unit, a fan, and a spraying unit;

[0006] The material bin unit includes a material bin, which includes a material area and a cavity area; the spraying unit includes a pressurized slinger; the pressurized slinger has a first conical structure in the middle of its end face;

[0007] A first airflow channel is provided between the fan and the cavity area, and the first airflow channel forms a positive air pressure in the cavity area under high-speed airflow; a second airflow channel is provided between the fan and the first conical structure, and the second airflow channel forms a negative pressure area in the first conical structure under high-speed airflow.

[0008] The negative pressure zone is equipped with a material discharge port.

[0009] Furthermore, the spraying unit also includes a Laval nozzle; the Laval nozzle includes two conical structures in opposite directions, the second airflow channel passes through the Laval nozzle, and the end of the Laval nozzle forms an acceleration zone under high-speed airflow; the booster disc is disposed in the acceleration zone.

[0010] Furthermore, the spraying unit also includes a swivel disc; one end face of the swivel disc has circumferentially distributed discrete columns and radially distributed swivel disc ribs; the swivel disc ribs connect the discrete columns of two adjacent layers; the discrete columns and the swivel disc ribs form multiple segmented areas on the end face.

[0011] Furthermore, the edge of the swivel disc is an involute curve.

[0012] Furthermore, the swivel disc is disposed below the pressurized swivel disc; the pressurized swivel disc can pressurize the swivel disc, thereby accelerating the swivel disc or driving the swivel disc to rotate.

[0013] Furthermore, the spraying unit also includes a spinning disc motor and a cone-shaped body; the spinning disc motor is provided with a spinning disc motor protective cover, and the spinning disc motor protective cover has a second cone-shaped structure;

[0014] The protective cover for the spinning disc motor, the spinning disc motor, and the conical body are sequentially arranged at the center of the Laval nozzle.

[0015] Furthermore, the spraying unit also includes a hollow shaft; the spraying unit is sleeved on the outside of the hollow shaft, and the hollow shaft can rotate with the rotating disc motor.

[0016] Furthermore, the discharge port of the material box is provided with a guide pipe, which is connected to the hollow shaft. Material can pass through the center of the hollow shaft, and the discharge hole is located at the end of the hollow shaft.

[0017] Furthermore, it also includes a flow meter unit, which includes a flow meter assembly and a feed interruption meter; the hopper has a discharge port, and the flow meter assembly and the feed interruption meter are disposed outside the feed guide pipe at the discharge port.

[0018] Another aspect of this utility model is to provide a drone, including the aforementioned drone powder and liquid spraying device.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) Compared to existing liquid spraying devices that cannot spray powder, this invention uses a high-speed airflow generated by a fan through two airflow channels. The first airflow channel extends from the fan to the cavity area of ​​the material box, creating positive pressure above the material area and pushing the material downwards towards the discharge port. The second airflow channel extends from the fan to the first conical structure, where a negative pressure zone is created by the rotation of the pressure-boosting disc. The positive and negative pressure settings accelerate the flow of material in the pipeline, improve the flowability of powder materials, reduce clogging of powder materials, and enable the liquid spraying device to be used for powder spraying as well.

[0021] (2) Compared with the prior art, in this utility model, the high-speed airflow of the fan directly enters the Laval nozzle, and obtains a higher speed airflow in the acceleration zone of the Laval nozzle. The booster disc is set in the acceleration zone of the Laval nozzle. The first conical structure of the booster disc obtains a lower negative pressure, and the material flow is smoother and more efficient, avoiding the phenomenon of powder materials getting stuck or blocked in the pipeline.

[0022] (3) The present invention has discrete columns and ribs on the end face of the sling plate; the discrete columns and ribs form multiple segmented areas on the end face of the sling plate, which uniformly divide the material when the sling plate rotates, thereby improving the dispersion of liquid medicine and powder. The edge of the sling plate adopts an involute curve, which enables the liquid medicine or powder entering through the hollow shaft to be accelerated out through the ribs.

[0023] (4) Compared with the prior art, the pressurized slinger disc of this invention is located on the upper part of the slinger disc, which can provide secondary pressurization for the slinger disc and provide a higher airflow speed when the slinger disc motor is working; when the slinger disc motor cannot be used, the pressurized slinger disc can drive the slinger disc to rotate, improving the stability of the spraying operation. Both the slinger disc and the pressurized slinger disc are located in the acceleration zone of the Laval nozzle. After being accelerated by the Laval nozzle, the rotation speed of the slinger disc is increased, resulting in better dispersion of the material thrown out by the slinger disc. Compared with the prior art where the slinger disc can only be used in liquid spraying devices, and the phenomenon of powder accumulation on the slinger disc occurs when it is used for powder spraying, the airflow accelerated by various methods in this invention reduces the accumulation of powder on the slinger disc, enabling the slinger disc to fully disperse the powder, thereby expanding the application of the slinger disc in UAV spraying.

[0024] (5) The present invention has a protective cover for a swivel motor, a swivel motor and a cone in the middle of the Laval nozzle; the protective cover for the swivel motor and the cone have a cone-shaped structure on the outside, which is used to reduce the local resistance of the fluid during flow, avoid the formation of turbulence and affect the flow speed of the airflow.

[0025] (6) The hollow shaft in this utility model has multiple functions. Firstly, it serves as the rotating shaft of the sling motor and the sling and booster sling, enabling the sling and booster sling to rotate around the hollow shaft. Secondly, the hollow internal structure can transport materials to the booster sling. Thirdly, as the hollow shaft rotates with the sling motor, the materials inside can be accelerated to flow.

[0026] (7) In this utility model, the flow meter assembly is used to monitor the flow rate of the pipeline in real time so as to adjust the flow rate. The feed interruption meter is used to detect whether the feed box is in a state of no feed.

[0027] (8) Compared with the existing technology where the spraying device cannot be used for both powder spraying and liquid spraying, this utility model can be adapted to liquids or powders of different viscosities by adjusting the speed of the fan and the swivel disc. Liquids with no viscosity or low viscosity have good fluidity, so the speed of the fan and the swivel disc can be adjusted to a low speed; liquids or powders with high viscosity have poor fluidity, so the speed of the fan and the swivel disc can be adjusted to a high speed, thereby giving the first conical structure a lower negative pressure and making the powder suction effect better.

[0028] This invention improves airflow velocity through multiple methods, including setting positive and negative pressure at both ends of the material, using a hollow shaft as a material channel, placing the negative pressure zone in the acceleration zone of the Laval nozzle, and designing a conical structure on the outside of the motor protective cover of the slinger. This lowers the pressure in the negative pressure zone, allowing the material to be quickly extracted and accelerating its flow. Furthermore, the high-speed airflow accelerated by these multiple methods prevents powder from accumulating on the slinger, thus solving the problems of powder jamming and clogging when using a liquid spraying device for powder spraying. This enables the liquid spraying device to achieve the function of powder spraying.

[0029] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0030] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0031] Figure 1 A schematic diagram of the powder and liquid spraying device for a drone;

[0032] Figure 2 A cross-sectional schematic diagram of the powder and liquid spraying device for a drone;

[0033] Figure 3 This is a schematic diagram of the spraying unit.

[0034] Figure 4 A schematic diagram of the booster disc structure;

[0035] Figure 5 This is a schematic diagram of the structure of the slinger.

[0036] Figure label:

[0037] 1-Bag unit, 11-Bag, 111-Material area, 112-Cavity area, 12-Bag feeding assembly, 121-Bag feeding cover, 122-Feed filter screen, 123-First waterproof ring, 13-Bag discharging assembly, 131-Second waterproof ring, 132-Guide pipe, 1321-Guide pipe connector, 2-Fan, 21-Fan motor, 22-Fan housing, 3-Spraying unit, 31-Boosting disc, 311-Impeller, 312-First conical structure, 32-Laval nozzle, 33-Dispensing disc 331-Discrete column, 332-Spinning disc rib, 333-Spinning disc protective cover, 34-Spinning disc motor, 341-Spinning disc motor protective cover, 35-Conical body, 36-Hollow shaft, 361-Discharge hole, 362-Hollow shaft fixing bracket, 4-Pressure boosting unit, 41-Pressure boosting port cover, 42-Third waterproof ring, 43-Pressure boosting filter screen, 44-Pressure boosting pipe, 5-Flow meter unit, 51-Flow meter assembly, 52-Material cut-off meter, 521-Material cut-off meter reflector, 53-Connecting nut, 6-Weighing gauge, 7-Machine frame. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0039] A specific embodiment of this utility model is as follows: Figure 1 and Figure 2 As shown, a drone powder and liquid spraying device is disclosed, including a material bin unit 1, a fan 2 and a spraying unit 3.

[0040] The material bin unit 1 includes a material bin 11, a material bin feeding assembly 12, and a material bin discharging assembly 13.

[0041] The material bin 11 is funnel-shaped. The inside of the material bin 11 is used to hold materials, which are liquid or powder. The inside of the material bin 11 is divided into a material area 111 and a cavity area 112, with the cavity area 112 located above the material area 111.

[0042] The material hopper 11 has an inlet and an outlet. The inlet is equipped with a material hopper feeding assembly 12, including a material hopper feeding cover 121 and a feeding filter screen 122. The material hopper feeding cover 121 is sealed to the material hopper 11 by a first waterproof ring 123. The feeding filter screen 122 is provided at the lower part of the material hopper feeding cover 121 for filtering powders and liquids, preventing excessively large lumps from clogging the pipe.

[0043] The material discharge assembly 13 is located at the discharge port and includes a second waterproof ring 131 and a guide pipe 132. The second waterproof ring 131 is used to seal the discharge port and the material box 11. The guide pipe 132 is used to discharge the material in the material box 11. A guide pipe connector 1321 is provided at the end of the guide pipe 132.

[0044] Fan 2 is installed at the bottom of the material box 11 to provide high-speed airflow for the device. A fan motor 21 is located at the center of fan 2 to drive it. Fan 2 is externally equipped with a fan housing 22 and a dust filter to protect it from corrosion by dust and other contaminants. Driven by the fan motor 21, fan 2 generates airflow at different speeds.

[0045] The upper part of the edge of the fan 2 is connected to the cavity area 112 of the material box 11. A first airflow channel is provided between the fan 2 and the cavity area 112 to allow the airflow generated by the fan 2 to flow into the cavity area 112 of the material box 11, generating positive air pressure in the cavity area 112 and pushing the material to flow to the outside of the material box 11.

[0046] like Figure 3 As shown, the spraying unit 3 includes a pressurized spool disc 31. (As indicated...) Figure 4 As shown, the booster impeller 31 has multiple circumferentially distributed impellers 311. A first conical structure 312 is provided at the center of one end face of the booster impeller 31. When the booster impeller 31 rotates at high speed, the first conical structure 312 forms a negative pressure zone.

[0047] A second airflow channel is provided between the fan 2 and the first conical structure 312, which is used to generate negative air pressure in the first conical structure 312 through the airflow generated by the fan 2, so that the material flows from positive air pressure to negative air pressure.

[0048] Compared to existing liquid spraying devices that cannot spray powder, this embodiment uses a high-speed airflow generated by fan 2 through two airflow channels. The first airflow channel runs from fan 2 to the cavity area 112 of the material box 11, creating positive pressure above the material area 111 and pushing the material downwards towards the outlet. The second airflow channel runs from fan 2 to the first conical structure 312, where the rotation of the pressure boosting disc 31 creates a negative pressure zone. The positive and negative pressure settings accelerate the flow of material within the pipes, improve the flowability of powder materials, reduce clogging, and enable the liquid spraying device to be used for powder spraying as well.

[0049] Furthermore, the spraying unit 3 also includes a Laval nozzle 32. The Laval nozzle 32 comprises two conical tubes pointing in opposite directions. When a high-speed airflow enters the Laval nozzle 32, according to Laval's principle, the pressure first contracts and then expands, generating a higher-speed airflow at the end of the Laval nozzle 32, thus accelerating the airflow. Therefore, the end of the Laval nozzle 32 is an acceleration zone. The lower edge of the fan 2 connects to the upper part of the Laval nozzle 32, and another portion of the airflow from the fan 2 directly enters the Laval nozzle 32, forming a higher-speed airflow.

[0050] It should be noted that the booster disc 31 is located in the terminal acceleration zone of the Laval nozzle 32.

[0051] Compared to existing technologies, when the airflow from fan 2 passes through the Laval nozzle 32, it obtains a higher airflow speed at the pressure booster disc 31, resulting in a lower negative pressure in the first conical structure 312 of the pressure booster disc 31. This leads to a greater pressure difference between the cavity area 112 of the material box 11 and the negative pressure area of ​​the first conical structure 312. Under the airflow acceleration effect of the Laval nozzle 32, material flow is smoother and more efficient, further reducing the phenomenon of powder materials getting stuck or blocked in the pipeline.

[0052] It should be noted that the fan motor is used to adjust the fan speed. When spraying liquids with no viscosity or low viscosity, the fan speed can be adjusted to a lower speed; when spraying liquids or powders with higher viscosity, the fan speed can be adjusted to a higher speed.

[0053] Furthermore, the spraying unit 3 also includes a swivel disc 33, which is disposed at the lower part of the pressurized swivel disc 31. The swivel disc 33 is used to disperse the material adsorbed by the pressurized swivel disc 31, and to fully disperse the powder when atomizing liquid medicine by high-speed rotation or spraying powder.

[0054] like Figure 5 As shown, the end face of the spinning disc 33 is provided with spinning disc ribs 332 and discrete columns 331; the discrete columns 331 include inner discrete columns 331 and outer discrete columns 331, and the spinning disc ribs 332 connect the inner discrete columns 331 and the outer discrete columns 331. The discrete columns 331 and the spinning disc ribs 332 are evenly distributed, forming multiple segmented areas on the end face of the spinning disc 33. When the spinning disc 33 rotates, the multiple segmented areas evenly divide the material, improving the dispersion of liquid and powder.

[0055] The edge of the sling plate 33 adopts an involute curve, which enables the liquid or powder to be slinged out faster through the sling plate ribs 332.

[0056] The booster disc 31 is located on top of the disc 33 and is used to provide secondary boost to the disc 33. Both the disc 33 and the booster disc 31 are located in the acceleration zone of the Laval nozzle 32.

[0057] Compared to existing technologies, this embodiment places the slinger 33 below the booster slinger 31 to achieve secondary pressurization. When the slinger motor 34 is operating, it can provide a higher airflow speed; when the slinger motor 34 is unavailable, the booster slinger 31 can drive the slinger 33 to rotate, improving the stability of the spraying operation. Both the slinger 33 and the booster slinger 31 are located in the acceleration zone of the Laval nozzle 32. Acceleration by the Laval nozzle 32 increases the rotational speed of the slinger 33, resulting in better dispersion of the material slinged out by the slinger 33.

[0058] The outside of the swiping disc 33 is equipped with a swiping disc protective cover 333, which is used to reduce the upward airflow generated by the swiping disc 33 and prevent powder from sticking to the wall; and can also prevent turbulence from affecting the liquid medicine or powder, and reduce the corrosion of the liquid medicine or powder on the machine body.

[0059] Furthermore, the spraying unit 3 also includes a swivel motor 34 and a cone 35.

[0060] The spinning disc 33 is driven to rotate by the spinning disc motor 34. The spinning disc motor 34 can adjust the rotation speed of the spinning disc 33, so that the spinning disc 33 can spin out droplets with different degrees of liquefaction or powders with different dispersion states. When it is necessary to spray a liquid with no viscosity or low viscosity, the spinning disc motor can be adjusted to a lower speed; when it is necessary to spray a liquid or powder with high viscosity, the spinning disc motor can be adjusted to a higher speed.

[0061] The upper part of the swivel motor 34 is equipped with a swivel motor protective cover 341 to prevent excessive dust from entering the swivel motor 34 and affecting its operation.

[0062] It should be noted that the deflector motor protective cover 341, the deflector motor 34, and the conical body 35 are sequentially arranged at the center of the Laval nozzle 32. The deflector motor protective cover 341 has a second conical structure. The conical structures on the outside of the deflector motor protective cover 341 and the conical body 35 can reduce the local resistance of the airflow during flow, thereby reducing the turbulence at the center of the Laval nozzle 32 and preventing the formation of backflow and vortices in the high-speed airflow.

[0063] Furthermore, the spraying unit 3 also includes a hollow shaft 36. The spraying unit 3 is sleeved on the outside of the hollow shaft 36. The upper part of the hollow shaft 36 is connected to the guide pipe 132, the middle part can convey materials, and the end has a discharge hole 361 for discharging materials. It should be noted that the discharge hole 361 of the hollow shaft 36 is located in the negative pressure zone formed by the first conical structure 312 of the booster disc 31. When materials are introduced into the hollow shaft 36, the downward pushing action of the airflow in the booster pipe 44 on the materials in the material box 11, the suction action of the negative pressure zone of the booster disc 31 on the materials, and the action of gravity, compared with the simple action of gravity of the materials, the flow of materials is accelerated, and the flow speed of materials in the pipe is increased. Furthermore, the hollow shaft 36 is the rotating shaft of the disc motor 34. The hollow shaft 36 rotates with the disc motor 34, and the rotation of the hollow shaft 36 also accelerates the flow of materials inside.

[0064] A hollow shaft fixing bracket 362 is provided on the upper part of the hollow shaft 36 for fixing the hollow shaft 36, and a bearing and protective rubber sleeve assembly is provided on the lower part of the hollow shaft fixing bracket 362 along the circumference of the hollow shaft 36.

[0065] Furthermore, it also includes a pressurization unit 4. The pressurization unit 4 includes a pressurization filter 43, a pressurization port cover 41 at the pressurization port, a third waterproof ring 42 for sealing the pressurization port and the material box 11, and a pressurization pipe 44. The pressurization pipe 44 extends from the upper edge of the fan 2 upwards to the pressurization port, passing through the material area 111 and the cavity area 112 of the entire material box 11. The pressurization filter 43 is disposed at the end of the pressurization pipe 44 located at the pressurization port, covering the entire pressurization port, and is used to filter dust and materials inside the pressurization pipe 44.

[0066] When fan 2 rotates at high speed driven by fan motor 21, high-speed airflow is generated at the edge of the fan blades. Part of the airflow is input to the pressure port through the pressure boosting pipe 44. After being filtered by the pressure boosting filter screen 43, the airflow enters the cavity area 112 of the material box 11. The pressure boosting pipe 44 forms the first airflow channel. The first airflow channel generates a downward thrust on the material in the material box 11, causing the material to move downward.

[0067] Furthermore, it also includes a flow meter unit 5, which is located outside the outlet of the material box 11. The flow meter unit 5 includes a flow meter assembly 51, a feed interruption meter 52, and a connecting nut 53.

[0068] The flow meter assembly 51 is used to monitor the flow rate in the pipeline in real time for flow regulation. The feed cut-off meter 52 is used to detect whether the feed hopper 11 is empty; the feed cut-off meter reflector 521 is a radar wave reflector for the feed cut-off meter 52. The electromagnetic waves emitted by the feed cut-off meter 52 are reflected by the feed cut-off meter reflector 521, and the feedback signal detects whether the feed hopper is empty. The connecting nut 53 is used to connect the flow meter assembly 51 to the feed hopper 11 and seals it with a fourth waterproof ring.

[0069] When material passes through the flow meter assembly 51, the flow meter assembly 51 calculates the current flow rate and adjusts the switch size to control the flow rate of powder or liquid. The material cut-off meter 52 provides feedback on whether the material container is empty.

[0070] Furthermore, it also includes a weighing meter 6. The weighing meter 6 is a three-point support for the material box 11, used to count the remaining material.

[0071] Furthermore, it also includes a machine frame 7 for fixing the material box unit 1.

[0072] The usage method of this embodiment is as follows:

[0073] Material is fed into the feed hopper 11 through the feed cover 121, and lumpy material is filtered out by the feed filter 122 before entering the feed hopper 11. It is then guided through the guide pipe 132 at the outlet of the feed hopper 11 into the hollow shaft 36, and flows through the hollow portion of the hollow shaft 36 to the discharge hole 361 on the lower side wall of the hollow shaft 36 for discharge. The powder is dispersed and ejected by the high-speed rotation of the tossing disc 33, while the liquid medicine is atomized and ejected by the tossing disc 33.

[0074] During discharge, the discharge hole 361 on the lower side wall of the hollow shaft 36 corresponds to the first conical structure 312 of the pressure-boosting disc 31, and the material is sucked out by negative pressure to avoid clogging the hollow shaft 36. The fan 2 rotates counterclockwise at high speed driven by the fan motor 21, and high-speed airflow is generated at the edge of the fan blades. The high-speed airflow flows out through the first airflow channel and the second airflow channel.

[0075] The first airflow channel is a booster pipe 44 located between the upper edge of the fan 2 and the cavity area 113 of the material box 11, generating positive air pressure in the cavity area 112 of the material box 11, forcing the material to be squeezed outwards. The second airflow channel is a first conical structure 312 located from the lower edge of the fan 2 to the booster disc 31, generating negative air pressure at the first conical structure 312. Driven by the pressure difference between the positive and negative air pressures, the material flows from the material box 11 to the discharge port 361 and is sucked out in the negative pressure area. The second airflow channel passes through the Laval nozzle 32 and is accelerated by the Laval nozzle 32, resulting in lower air pressure in the negative pressure area, which improves the material powder suction effect and further reduces powder blockage in the pipeline.

[0076] After the material is sucked out, it enters the lower part of the pressure-boosting disc 31 and the disc 33. The powder is dispersed by the disc 33 and then thrown out, and the liquid medicine is atomized by the disc 33 and then thrown out.

[0077] Because the edge of the slinger 33 is an involute, the material is accelerated and ejected through the slinger ribs 332. Simultaneously, the discrete column 331 disperses the liquid or powder, improving the liquid atomization and powder dispersion effects. The slinger motor 34 adjusts the rotation speed of the slinger 33 to obtain the desired droplets or powder. During powder spraying, this reduces the occurrence of powder clumps, improves the mixing of powder and airflow, and makes the powder disperse more evenly.

[0078] When the material is discharged from the material box 11, it passes through the flow meter assembly 51. The flow meter assembly 51 calculates the current flow rate and adjusts the size of the switch to control the flow rate. The material cut-off meter 52 provides feedback on whether the material box is empty.

[0079] By adjusting the speed of the fan and the speed of the swivel disc, the device can be adapted to liquids or powders of different viscosities.

[0080] Compared to existing technologies where spraying devices cannot be used for both powder and liquid spraying, this embodiment can adapt to liquids or powders of different viscosities by adjusting the speed of the fan and the swivel disc. Liquids with no viscosity or low viscosity have good flowability, so the fan and swivel disc can be adjusted to a low speed; liquids or powders with high viscosity have poor flowability, so the fan and swivel disc can be adjusted to a high speed.

[0081] In this embodiment, the high-speed airflow of fan 2 applies positive and negative pressure to both ends of the material, accelerating the flow of the material, especially powder, within the pipe, allowing the material to be quickly sucked out by the negative pressure zone. By setting the hollow shaft 36 of the spinning disc motor 34 as the material flow channel, the high-speed rotation of the hollow shaft 36 accelerates the flow of the material. The negative pressure zone is set in the acceleration zone of the Laval nozzle 32 to increase the airflow velocity. The outer part of the spinning disc motor protective cover 341 is set with a conical structure, and the cone 46 is set to prevent the airflow from forming turbulence and reduce the airflow resistance, thereby increasing the airflow velocity and accelerating the flow of the material, enabling the material to be quickly sucked out. Furthermore, the high-speed airflow prevents the powder from accumulating on the spinning disc 33, solving the problem of powder jamming and clogging when the liquid spraying device is used for powder spraying, thus enabling the liquid spraying device to achieve the function of powder spraying.

[0082] Compared to existing technologies where the spray disc 33 can only be used in liquid spraying devices and powder spraying can result in powder accumulation on the spray disc 33, this embodiment places the spray disc 33 below the pressurized spray disc 31. The powder is transported to the spray disc 33 by a high-speed airflow driven by a large positive and negative pressure difference, accelerated by the Laval nozzle 32, and accelerated by the pressurized spray disc 31. The powder is divided and dispersed by the discrete columns 331 and the ribs 332 of the spray disc 33. The presence of the high-speed airflow reduces the accumulation phenomenon on the spray disc 33, enabling the spray disc 33 to fully disperse the powder, thereby expanding the application of the spray disc 33 in drone spraying.

[0083] This utility model embodiment also provides a drone, including the drone powder spraying and liquid spraying device described in the above embodiments.

[0084] Compared with the prior art, the advantages of the drone in this utility model embodiment are the same as those of the above-mentioned drone powder spraying and liquid spraying devices, and will not be repeated here.

[0085] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A powder and liquid spraying device for unmanned aerial vehicles (UAVs), characterized in that, It includes a material bin unit (1), a fan (2), and a spraying unit (3); The material bin unit (1) includes a material bin (11), which includes a material area (111) and a cavity area (112); the spraying unit (3) includes a pressurized slinger (31); the pressurized slinger (31) has a first conical structure (312) in the middle of its end face; A first airflow channel is provided between the fan (2) and the cavity area (112), and the first airflow channel forms a positive air pressure in the cavity area (112) under high-speed airflow; a second airflow channel is provided between the fan (2) and the first conical structure (312), and the second airflow channel forms a negative pressure area in the first conical structure (312) under high-speed airflow; The negative pressure zone is provided with a material discharge port (361).

2. The UAV powder and liquid spraying device according to claim 1, characterized in that, The spraying unit (3) also includes a Laval nozzle (32); the Laval nozzle (32) includes two conical structures in opposite directions, the second airflow channel passes through the Laval nozzle (32), and the end of the Laval nozzle (32) forms an acceleration zone under high-speed airflow; the booster disc (31) is disposed in the acceleration zone.

3. The UAV powder and liquid spraying device according to claim 2, characterized in that, The spraying unit (3) further includes a swivel disc (33); the end face of the swivel disc (33) has circumferentially distributed discrete columns (331) and radially distributed swivel disc ribs (332); the swivel disc ribs (332) connect the discrete columns (331) of two adjacent layers; the discrete columns (331) and the swivel disc ribs (332) form multiple segmented areas on the end face.

4. The UAV powder and liquid spraying device according to claim 3, characterized in that, The edge of the swivel disc (33) is an involute curve.

5. The UAV powder and liquid spraying device according to claim 3, characterized in that, The swivel disc (33) is located at the lower part of the pressurized swivel disc (31); the pressurized swivel disc (31) can pressurize the swivel disc (33) to accelerate or drive the swivel disc (33) to rotate.

6. The UAV powder and liquid spraying device according to claim 2, characterized in that, The spraying unit (3) also includes a swivel motor (34) and a cone (35); the swivel motor (34) is provided with a swivel motor protective cover (341) on the outside, and the swivel motor protective cover (341) has a second cone structure; The protective cover (341) for the spinning disc motor, the spinning disc motor (34), and the cone (35) are sequentially arranged at the center of the Laval nozzle (32).

7. The UAV powder and liquid spraying device according to claim 6, characterized in that, The spraying unit (3) also includes a hollow shaft (36); the spraying unit (3) is sleeved on the outside of the hollow shaft (36), and the hollow shaft (36) can rotate with the rotation of the swivel motor (34).

8. The UAV powder and liquid spraying device according to claim 7, characterized in that, The material box (11) is provided with a material guide pipe (132) at its outlet. The material guide pipe (132) is connected to the hollow shaft (36). Material can pass through the center of the hollow shaft (36). The discharge hole (361) is located at the end of the hollow shaft (36).

9. A powder and liquid spraying device for unmanned aerial vehicles according to any one of claims 1-7, characterized in that, It also includes a flow meter unit (5), which includes a flow meter assembly (51) and a feed interruption meter (52); the hopper (11) has a discharge port, and the flow meter assembly (51) and the feed interruption meter (52) are disposed outside the feed guide pipe (132) at the discharge port.

10. A drone, characterized in that, Includes the drone powder and liquid spraying device as described in any one of claims 1-9.

Images