Device and method for plant pest control drone

Abstract

The present invention discloses a device and method for a plant pest control drone, comprising an agricultural and forestry drone body, two symmetrical arms are installed on the left and right outer walls of the agricultural and forestry drone body, and an electric propeller is installed on the top of the arm, and a landing leg frame is installed on the bottom of the arm; an inverted U-shaped support frame, two inverted U-shaped supports are provided, and the two inverted U-shaped supports are symmetrically fixed at the bottom of the agricultural and forestry drone body, and a driving shaft is installed for rotation inside the inverted U-shaped support frame, and a two-level adjustable extension module is installed at one end of the driving shaft. The present invention uses the two-level adjustable extension module to enable the drone to accurately control the spraying angle of the agent according to the different growth stages of the plant and the specific distribution of the pests and diseases.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural and forestry unmanned aerial vehicles, and in particular to a device and method for a plant pest prevention unmanned aerial vehicle. Background Art

[0002] The spraying and spreading devices of agricultural and forestry plant protection drones mainly realize the functions of precise application of pesticides, improving work efficiency, reducing labor costs and reducing environmental pollution, significantly improving the quality and sustainability of agricultural and forestry production. The main structures of such devices include components such as drug storage tanks, nozzle systems, pump systems, control systems, navigation and positioning systems, and power systems. The integration of these technologies enables drones to accurately adjust the application amount and position of drugs according to real-time crop needs and environmental conditions, thereby maximizing the prevention and control effect to control pests, reduce losses, and reduce the use of pesticides and environmental pollution during planting; such as a drone liquid spraying device for pest control in forestry planting disclosed in the authorization announcement number CN221082502U, including a drone body, the front and rear sides of the bottom of the drone body are fixedly connected to support columns, the bottom of the support columns are fixedly connected to a bottom plate, the front and rear sides of the top of the bottom plate are detachably connected to connecting plates, the top of the connecting plate is fixedly connected to a liquid storage tank, and the bottom The front, back, left and right sides of the plate are provided with pressing components, the front, back, left and right sides of the bottom plate are provided with inner cavities, and the inner side of the inner cavity is provided with a second spring, and the left and right sides of the bottom of the connecting plate are fixedly connected with support rods, which realize the installation and disassembly of the liquid storage tank, which is conducive to the rapid replacement of the liquid storage tank after use. However, when the pesticide is sprayed, the liquid in the liquid storage tank flows into the connecting pipe, and then flows to the dredging pipe through the water pump, and finally sprays out from several nozzles. At this time, the action direction and angle of the dredging pipe and the nozzle are in a constant state. When it is necessary to control the action range of the spraying structure, it is difficult to adjust it, which will cause the crops on the same flight path of the drone to be over- or under-applied, that is, uneven distribution of the agent, thereby affecting the pest control effect, and environmental factors (such as wind speed, temperature, humidity, etc.) during the spraying process have a significant effect on the effectiveness and drift of the agent, especially when the wind speed is high, the agent will be blown away and dispersed, resulting in the failure of the effective ingredients in the liquid to cover the crops. Summary of the invention

[0003] The object of the present invention is to provide a device and method for a plant pest control drone. Both sides of the bottom of the agricultural and forestry drone body are equipped with a two-stage adjustable extension module. The two-stage adjustable extension module realizes a two-stage joint swing adjustment to control the downward spray direction and angle of the multi-line brushless spray unit. The two opposite multi-line brushless spray units can swing closer to each other to increase the spray density and reduce the spray range. The two opposite multi-line brushless spray units tilt and swing away from each other to reduce the spray density and expand the spray range, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a device for a plant pest control drone, comprising:

[0005] The main body of the agricultural and forestry drone has two symmetrical arms installed on the left and right outer walls of the main body, and the top of the arms is equipped with electric propellers, and the bottom of the arms is equipped with landing legs;

[0006] An inverted U-shaped support frame, wherein two inverted U-shaped supports are provided, and the two inverted U-shaped supports are symmetrically fixed at the bottom end of the agricultural and forestry UAV body, and a driving shaft is rotatably installed inside the inverted U-shaped support frame, and a secondary adjustable extension module is installed at one end of the driving shaft, and a multi-line brushless spray unit is installed at the active end of the secondary adjustable extension module;

[0007] The secondary adjustable extension module includes a primary double-layer swing arm fixed on the surface of the driving shaft, and a secondary swing arm hingedly installed at the top of the primary double-layer swing arm. The multi-line brushless spray unit is installed on two of the secondary swing arms in the same Y-axis direction. The top of the primary double-layer swing arm is equipped with a first screw push-pull mechanism for interconnecting with the outer wall of one side of the inverted U-shaped support frame, and the bottom end of the primary double-layer swing arm is equipped with a second screw push-pull mechanism for interconnecting with the bottom end of the secondary swing arm.

[0008] Preferably, the inverted U-shaped bracket includes a straight-mouth connecting plate bolted to one side of the bottom end of the agricultural and forestry UAV body, and two symmetrical right-angle brackets welded to the bottom end of the straight-mouth connecting plate, and the driving shaft is rotatably installed inside the right-angle bracket through a bearing seat.

[0009] Preferably, the first-level double-layer swing arm includes a front clamp fixed on one end of the driving shaft surface, a double dovetail profile arm fixed on an outer wall on one side of the front clamp, and a rear support fixed on the top end of the double dovetail profile arm, and an outer wall on one side of the rear support is connected to the top end of the second-level swing arm through a hinge shaft.

[0010] Preferably, the right-angle bracket and the straight-mouth connecting plate are made of aluminum alloy components, and a plurality of internal threaded holes are arranged on the surface of the straight-mouth connecting plate.

[0011] Preferably, the first screw push-pull mechanism includes vertical bearing seats fixed on both sides of the top end of the first-level double-layer swing arm, a one-way screw rotatably installed between the two vertical bearing seats, and a first nut pair installed at the thread at one end of the surface of the one-way screw, a support rod is fixed on the outer wall of the side of the inverted U-shaped support frame close to the first-level double-layer swing arm, a connecting rod is rotatably installed at one end of the surface of the support rod, and an end of the connecting rod away from the support rod is hinged to the outer wall of one side of the first nut pair, and the first screw push-pull mechanism also includes a pulley servo drive unit installed on one side of the top end of the first-level double-layer swing arm, and the pulley servo drive unit is used to drive the one-way screw to rotate.

[0012] Preferably, the second screw push-pull mechanism includes vertical bearing seats fixed on both sides of the bottom end of the first-level double-layer swing arm, a one-way screw second rotatably installed between the two vertical bearing seats, and a second nut pair mounted on the thread at one end of the surface of the one-way screw second, and the front and rear outer walls of the second nut pair are hinged with limit rods, one end of the connecting rod is hinged to the bottom end of the secondary swing arm, and the other side of the bottom end of the first-level double-layer swing arm is installed with a pulley servo drive unit second for driving the one-way screw second to rotate.

[0013] Preferably, the pulley servo drive unit includes a motor seat installed on one side of the top end of the first-level double-layer swing arm, a servo motor installed inside the motor seat, and a crawler transmission structure installed at the output end of the servo motor for driving a one-way screw rod to rotate.

[0014] Preferably, the multi-line brushless spray unit includes a connecting arm slidably bolted to the surface of the secondary swing arm, a frame fixed between the two connecting arms and a water tank fixed on the top of the frame, brushless pumping mechanisms are installed on both sides of the bottom end of the water tank, and a two-way spray mechanism interconnected with the liquid outlet end of the brushless pumping mechanism is installed on the back of the frame.

[0015] Preferably, the brushless pumping mechanism is composed of a brushless DC water pump installed at the liquid outlet of the water tank and a liquid collecting pipe installed at the output end of the brushless DC water pump, and the bidirectional liquid spraying mechanism includes a tee installed at the bottom of the liquid collecting pipe, liquid distribution pipes installed on both sides of the top of the tee, and a plurality of nozzles installed at equal intervals on the outer wall of one side of the liquid distribution pipe.

[0016] The present invention also provides a method for a plant pest control drone, such as the device for a plant pest control drone as described above, comprising the following steps:

[0017] S01: Use the agricultural and forestry drone to carry the inverted U-shaped support frame, the secondary adjustable extension module, the multi-line brushless spray unit and other components to the spraying operation point of the crops;

[0018] S102: The staff adjusts the relative spraying angle and height between two adjacent multi-line brushless spray units through the secondary adjustable extension module according to the on-site environmental wind speed, crop growth status and terrain changes;

[0019] S103: The first screw push-pull mechanism supports and rotates the first-level double-layer swing arm, so as to preliminarily adjust the approximate working angles of the first-level double-layer swing arm, the second-level swing arm, and the multi-line brushless spray unit. Since the second-level swing arm is hingedly mounted on the first-level double-layer swing arm, the second screw push-pull mechanism controls the swing amplitude and posture of the second-level swing arm again by mechanical push-pull, so as to adjust the spraying height and angle of the multi-line brushless spray unit.

[0020] S104: During the flight of the agricultural and forestry UAV body, the multi-line brushless spray unit and other components, the multi-line brushless spray unit continuously sprays the pesticide downward, and the downward wind force generated by the electric propeller allows the pesticide to cover the crops, so as to achieve precise pesticide application.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the device and method for plant pest control drones are provided with structures that cooperate with each other, such as a multi-line brushless spray unit and a two-level adjustable extension module. During its operation, the two-level adjustable extension module is used to enable the drone to accurately control the spraying angle of the agent according to the different growth stages of the crops and the specific distribution of the pests and diseases. When facing areas with serious local pests and diseases, the multi-line brushless spray unit can be adjusted to a more concentrated spraying mode, thereby increasing the concentration of the agent in a specific area and improving the prevention and control effect. On the contrary, in areas where crops are healthy, the spraying density can be reduced to avoid unnecessary use of the agent. In addition, when the wind speed is high outside, the two multi-line brushless spray units can be synchronously tilted in opposite directions to reduce the spraying height of the agent and increase the spraying density, thereby reducing the drift and loss of the agent caused by the wind. In this way, the spraying mode can be adjusted according to real-time environmental data to improve the efficiency and accuracy of the spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 It is a schematic diagram of the upper and lower isometric three-dimensional structure of the present invention;

[0024] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 4 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 5The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the main body of the agricultural and forestry drone of the present invention;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the first screw push-pull mechanism of the second embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the second screw rod push-pull mechanism of the second embodiment of the present invention;

[0030] Fig. 9 This is a schematic diagram of the three-dimensional structure of a first-level double-layer swing arm according to the second embodiment of the present invention;

[0031] Fig.10 The three-dimensional structure of the multi-line brushless liquid spray unit of the third embodiment of the present invention is shown in FIG. Figure 1 ;

[0032] Fig.11 The three-dimensional structure of the multi-line brushless liquid spray unit of the third embodiment of the present invention is shown in FIG. Figure 2 ;

[0033] Fig.12 The three-dimensional structure of the multi-line brushless liquid spray unit of the third embodiment of the present invention is shown in FIG. Figure 3 .

[0034] In the figure: 1. Agriculture and forestry UAV body; 2. Machine arm; 3. Electric propeller; 4. Landing leg frame; 5. Inverted U-shaped support frame; 501. Right-angle support frame; 502. Straight-mouth connecting plate; 6. Secondary adjustable extension module; 7. Active shaft; 8. First-level double-layer swing arm; 801. Front card plate; 802. Double dovetail profile arm; 803. Rear support; 9. Secondary swing arm; 10. First screw push-pull mechanism; 1001. Belt pulley servo drive unit 1; 1002. One-way screw 1; 1003. First nut pair; 1004. Connecting rod; 1 005, support rod; 11, second screw push-pull mechanism; 1101, pulley servo drive unit 2; 1102, one-way screw 2; 1103, second nut pair; 1104, limit rod; 12, multi-line brushless spray unit; 1201, connecting arm; 1202, frame; 1203, water tank; 1204, brushless pumping mechanism; 12041, brushless DC water pump; 12042, liquid collecting pipe; 1205, two-way spray mechanism; 12051, three-way pipe; 12052, liquid distribution pipe; 12053, nozzle. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. 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.

[0036] Embodiment 1, by Figures 1 to 6 The present invention comprises an agricultural and forestry UAV body 1, two symmetrical arms 2 are installed on the left and right outer walls of the agricultural and forestry UAV body 1, and an electric propeller 3 is installed on the top of the arm 2, and a landing leg frame 4 is installed on the bottom of the arm 2. The electric propeller 3 provides power and flight control for the device, and the landing leg frame 4 supports the stability and take-off and landing of the agricultural and forestry UAV body 1 on the ground;

[0037] An inverted U-shaped support frame 5, two inverted U-shaped support frames 5 are provided, and the two inverted U-shaped support frames 5 are symmetrically fixed at the bottom end of the agricultural and forestry UAV body 1, and a driving shaft 7 is rotatably installed inside the inverted U-shaped support frame 5, and a secondary adjustable extension module 6 is installed at one end of the driving shaft 7, and a multi-line brushless spray unit 12 is installed at the active end of the secondary adjustable extension module 6;

[0038] The secondary adjustable extension module 6 includes a primary double-layer swing arm 8 fixed on the surface of the driving shaft 7, and a secondary swing arm 9 hingedly mounted on the top of the primary double-layer swing arm 8. The multi-line brushless spray unit 12 is mounted on the two secondary swing arms 9 in the same Y-axis direction. The top of the primary double-layer swing arm 8 is mounted with a first screw push-pull mechanism 10 for interconnecting with the outer wall of one side of the inverted U-shaped support frame 5, and the bottom end of the primary double-layer swing arm 8 is mounted with a second screw push-pull mechanism 11 for interconnecting with the bottom end of the secondary swing arm 9.

[0039] A method for using a plant pest control drone in this embodiment, such as the device for using a plant pest control drone described above, comprises the following steps:

[0040] S101: The inverted U-shaped support frame 5, the secondary adjustable extension module 6, the multi-line brushless spray unit 12 and other components are carried to the operation point where the crops are to be sprayed by the agricultural and forestry UAV body 1;

[0041] S102: The staff adjusts the relative spraying angle and height between two adjacent multi-line brushless spray units 12 through the secondary adjustable extension module 6 according to the on-site environmental wind speed, crop growth status and terrain changes;

[0042] S103: The first screw push-pull mechanism 10 supports and rotates the primary double-layer swing arm 8, so as to preliminarily adjust the approximate working angles of the primary double-layer swing arm 8, the secondary swing arm 9 and the multi-line brushless spray unit 12. Since the secondary swing arm 9 is hingedly mounted on the primary double-layer swing arm 8, the second screw push-pull mechanism 11 controls the swing amplitude and posture of the secondary swing arm 9 again by mechanical push-pull, so as to adjust the spraying height and angle of the multi-line brushless spray unit 12.

[0043] S104: During the flight of the agricultural and forestry UAV body 1, the multi-line brushless spray unit 12 and other components, the multi-line brushless spray unit 12 continuously sprays the pesticide downward, and the downward wind force generated by the electric propeller 3 allows the pesticide to cover the crops, so as to achieve precise pesticide application.

[0044] Embodiment 2, based on embodiment 1, Figure 7 , Figure 8 and Fig. 9 It is given that the inverted U-shaped support frame 5 includes a straight-mouth connecting plate 502 bolted to one side of the bottom end of the agricultural and forestry UAV body 1, and two symmetrical right-angle supports 501 welded to the bottom end of the straight-mouth connecting plate 502. The driving shaft 7 is rotatably installed inside the right-angle support frame 501 through a bearing seat. The inverted U-shaped support frame 5 is composed of a right-angle support frame 501 and a straight-mouth connecting plate 502. The right-angle support frame 501 and the straight-mouth connecting plate 502 provide additional support and rigidity to ensure that the secondary adjustable extension module 6 will not produce excessive vibration or deformation during the operation due to the influence of external gravity or wind force, thereby ensuring the stable operation of the multi-line brushless spray unit 12;

[0045] The right-angle bracket 501 and the straight-mouth connecting plate 502 are made of aluminum alloy. The surface of the straight-mouth connecting plate 502 is provided with a plurality of internal thread holes. The right-angle bracket 501 and the straight-mouth connecting plate 502 made of aluminum alloy are helpful to reduce the overall weight, improve the flight efficiency, and ensure sufficient strength and durability.

[0046] The first-level double-layer swing arm 8 includes a front card plate 801 fixed to one end of the surface of the driving shaft 7, a double dovetail profile arm 802 fixed on the outer wall of one side of the front card plate 801, and a rear support 803 fixed to the top of the double dovetail profile arm 802. The outer wall of one side of the rear support 803 and the top of the secondary swing arm 9 are connected to each other through a hinge axis. The front card plate 801 is located at the front of the double dovetail profile arm 802 and is connected to the driving shaft 7, which plays the role of connection and support; the structural design of the double dovetail profile arm 802 can reduce the stress concentrated at a single point, and can also effectively improve the overall bending and torsion resistance. The rear support 803 plays the function of assisting the double dovetail profile arm 802 and the secondary swing arm 9 to hinge and flip at the opposite ends;

[0047] The first screw push-pull mechanism 10 includes vertical bearing seats fixed on both sides of the top of the first-level double-layer swing arm 8, a one-way screw 1002 rotatably installed between the two vertical bearing seats, and a first nut pair 1003 installed at the threaded portion of one end of the surface of the one-way screw 1002. A support rod 1005 is fixed on the outer wall of one side of the inverted U-shaped support frame 5 close to the first-level double-layer swing arm 8. A connecting rod 1004 is rotatably installed on one end of the surface of the support rod 1005. An end of the connecting rod 1004 away from the support rod 1005 is hinged to an outer wall of one side of the first nut pair 1003. The first screw push-pull mechanism 10 also includes a pulley servo drive unit 1001 installed on one side of the top of the first-level double-layer swing arm 8. The pulley servo drive unit 1001 is used to drive the one-way screw 1002 to rotate.

[0048] The pulley servo drive unit 1001 includes a motor seat installed on one side of the top end of the first-stage double-layer swing arm 8, a servo motor installed inside the motor seat, and a crawler transmission structure installed at the output end of the servo motor for driving the one-way screw rod 1002 to rotate;

[0049] When the first screw push-pull mechanism 10 is used to control the tilting angle of the first-level double-layer swing arm 8, the rotary power of the pulley servo drive unit 1001 is transmitted to the one-way screw 1002, and the one-way screw 1002 drives the first nut pair 1003 to move. Since the end of the connecting rod 1004 is connected to the inverted U-shaped support frame 5 and the first nut pair 1003, the linear motion of the first nut pair 1003 will be changed into the rotational motion of the first-level double-layer swing arm 8 under the connection of the connecting rod 1004 and the support rod 1005. At this time, the driving shaft 7 serves as the central axis of the first-level double-layer swing arm 8, so as to preliminarily adjust the operating angles of the first-level double-layer swing arm 8, the second-level swing arm 9, and the multi-line brushless spray unit 12;

[0050] The second screw push-pull mechanism 11 includes vertical bearing seats fixed on both sides of the bottom end of the first-stage double-layer swing arm 8, a one-way screw 1102 rotatably installed between the two vertical bearing seats, and a second nut pair 1103 mounted on the threaded part of one end of the surface of the one-way screw 1102. The front and rear outer walls of the second nut pair 1103 are both hinged with a limit rod 1104, one end of the connecting rod 1004 is hinged with the bottom end of the second-stage swing arm 9, and a pulley servo drive unit 1101 for driving the one-way screw 1102 to rotate is installed on the other side of the bottom end of the first-stage double-layer swing arm 8. When the second screw push-pull mechanism 11 is in motion, the pulley servo drive unit 1101 drives the one-way screw 1102 to rotate, and the one-way screw 1102 drives the second nut pair 1103 slides in the extension line direction of the first-level double-layer swing arm 8. Taking the upward movement of the second nut pair 1103 as an example, the second nut pair 1103 drives the second-level swing arm 9 to swing upward through the limit rod 1104, that is, the second-level swing arm 9 and the multi-line brushless spray unit 12 are turned up with the end of the first-level double-layer swing arm 8 as the axis, thereby adjusting the angle between the multi-line brushless spray unit 12 and the horizontal plane. The structural design of the first-level double-layer swing arm 8, the second-level swing arm 9, the first screw push-pull mechanism 10 and other components enables the multi-line brushless spray unit 12 to quickly adapt to different spraying requirements, greatly improving the operating efficiency, and enabling the UAV to respond to changes instantly during flight, reducing the time cost of frequently adjusting the spraying angle and posture in the early stage of flight.

[0051] Embodiment 3, based on embodiment 2, Fig.10 , Fig.11 and Fig.12 It is shown that the multi-line brushless spray unit 12 includes a connecting arm 1201 slidably bolted to the surface of the secondary swing arm 9, a frame 1202 fixed between the two connecting arms 1201, and a water tank 1203 fixed on the top of the frame 1202. Both sides of the bottom of the water tank 1203 are equipped with a brushless pumping mechanism 1204. The connecting arm 1201 and the frame 1202 are structural frames that support and fix the water tank 1203 and the brushless pumping mechanism 1204.

[0052] A two-way liquid spraying mechanism 1205 connected to the liquid outlet of the brushless pumping mechanism 1204 is installed on the back of the frame 1202. The water tank 1203 stores liquid medicine or other liquid medicines, and the brushless pumping mechanism 1204 is responsible for transporting the liquid medicine from the water tank 1203 to the two-way liquid spraying mechanism 1205 and spraying it out. It can effectively make the liquid medicine flow from the water tank 1203 to the two-way liquid spraying mechanism 1205 via the brushless pumping mechanism 1204, and at the same time, the precise control of spraying is realized through the two-level adjustable extension module 6;

[0053] The brushless pumping mechanism 1204 is composed of a brushless DC water pump 12041 installed at the outlet of the water tank 1203 and a liquid collecting pipe 12042 installed at the output end of the brushless DC water pump 12041. The bidirectional liquid spraying mechanism 1205 includes a three-way pipe 12051 installed at the bottom of the liquid collecting pipe 12042, a liquid dispensing pipe 12052 installed on both sides of the top of the three-way pipe 12051, and a plurality of nozzles 12053 installed at equal intervals on the outer wall of one side of the liquid dispensing pipe 12052. The brushless DC water pump 12041 pumps the water tank 1203 The liquid in the water is sent to the three-way pipe 12051 through the liquid collecting pipe 12042. The brushless DC water pump 12041 is more efficient than the traditional water pump structure, and can provide stable liquid transportation and work at a lower energy consumption. After the liquid is sent to the three-way pipe 12051, the liquid distribution pipe 12052 divides the liquid and finally sprays it out through the nozzle 12053. At this time, the multi-line brushless liquid spraying unit 12 will form a plurality of liquid spraying points under the agricultural and forestry UAV body 1 to ensure the optimization of the effect and coverage area of ​​the application.

[0054] The connecting arm 1201 and the secondary swing arm 9 are initially connected by a dovetail sliding structure, and the connecting arm 1201 and the secondary swing arm 9 are bolted and fixed by bolts. Through this structural design, the multi-line brushless spray unit 12 and the secondary swing arm 9 can be quickly disassembled and separated to facilitate the staff to perform replacement and maintenance operations.

[0055] When the embodiment of the present application is in use, the staff first controls the agricultural and forestry UAV body 1 through the remote control to work. At this time, the electric propeller 3 provides power and flight control for the device, and the landing leg frame 4 supports the stability and take-off and landing of the agricultural and forestry UAV body 1 on the ground. The arm 2 is responsible for supporting and installing the electric propeller 3 and the landing leg frame 4. In this process, the control module equipped with the agricultural and forestry UAV body 1 is used for flight control, sensor data processing and real-time communication with ground operators. The inverted U-shaped support frame 5, the secondary adjustable extension module 6, and the multi-line The brushless spray unit 12 and other components are carried to the point where the crops are to be sprayed. When the agricultural and forestry UAV body 1, the inverted U-shaped support frame 5, the secondary adjustable extension module 6 and other components fly to the area to be operated, the staff adjusts the relative spraying angle and height between the two adjacent multi-line brushless spray units 12 according to the on-site environmental wind speed, crop growth status and terrain changes. The staff sends a working signal to the agricultural and forestry UAV body 1 at the remote control end, and the control module of the agricultural and forestry UAV body 1 controls the secondary adjustable extension module 6 to work. At this time, the first screw push-pull mechanism 1 0 supports and rotates the first-level double-layer swing arm 8, thereby preliminarily adjusting the approximate working angles of the first-level double-layer swing arm 8, the second-level swing arm 9 and the multi-line brushless spray unit 12 and other components. Since the second-level swing arm 9 is hingedly installed on the first-level double-layer swing arm 8, the second screw push-pull mechanism 11 controls the swing amplitude and posture of the second-level swing arm 9 again by mechanical push-pull, thereby adjusting the spraying height and angle of the multi-line brushless spray unit 12. Through the second-level adjustable extension module 6, the agricultural and forestry UAV body 1 can assist the staff to dynamically adjust the multi-line brushless spray unit 12 during flight. The spraying angle and position can meet the needs of different crop growth stages and terrain conditions. For example, when facing farmlands of different heights and shapes, the working range and spraying density of the multi-line brushless spray unit 12 can be effectively adjusted by extending or folding the first-level double-layer swing arm 8 and the second-level swing arm 9 to achieve precise pesticide application. During the flight of the agricultural and forestry drone body 1, the multi-line brushless spray unit 12 and other components, the multi-line brushless spray unit 12 continuously sprays the pesticide downward, and the downward wind force generated by the electric propeller 3 covers the pesticide on the crops to achieve precise pesticide application;During operation, the device uses a two-stage adjustable extension module 6 to enable the drone to accurately control the spraying angle of the agent according to the different growth stages of the crops and the specific distribution of pests and diseases. When facing areas with serious local pests and diseases, the multi-line brushless spray unit 12 can be adjusted to a more concentrated spraying mode, thereby increasing the concentration of the agent in a specific area and improving the prevention and control effect. On the contrary, in areas with healthy crops, the spraying density can be reduced to avoid unnecessary use of the agent. In addition, when the wind speed is high, the two multi-line brushless spray units 12 can be tilted synchronously in opposite directions to reduce the spraying height of the agent and increase the spraying density, thereby reducing the drift and loss of the agent caused by the wind. In this way, the spraying mode can be adjusted according to real-time environmental data to improve the efficiency and accuracy of spraying. ;

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for a plant pest control drone, characterized in that: include: An agricultural and forestry drone body (1), wherein two symmetrical arms (2) are mounted on both left and right outer walls of the agricultural and forestry drone body (1), and electric propellers (3) are mounted on the top ends of the arms (2), and landing legs (4) are mounted on the bottom ends of the arms (2); An inverted U-shaped support frame (5), wherein two inverted U-shaped support frames (5) are provided, and the two inverted U-shaped support frames (5) are symmetrically fixed to the bottom end of the agricultural and forestry UAV body (1); a driving shaft (7) is rotatably mounted inside the inverted U-shaped support frame (5); a secondary adjustable extension module (6) is mounted at one end of the secondary adjustable extension module (6); and a multi-line brushless spray unit (12) is mounted at the movable end of the secondary adjustable extension module (6); The secondary adjustable extension module (6) comprises a primary double-layer swing arm (8) fixed on the surface of the driving shaft (7), and a secondary swing arm (9) hingedly mounted on the top of the primary double-layer swing arm (8), the multi-line brushless spray unit (12) is mounted on two secondary swing arms (9) in the same Y-axis direction, the top of the primary double-layer swing arm (8) is equipped with a first screw push-pull mechanism (10) for interconnecting with the outer wall of one side of the inverted U-shaped support frame (5), and the bottom of the primary double-layer swing arm (8) is equipped with a second screw push-pull mechanism (11) for interconnecting with the bottom of the secondary swing arm (9); The multi-line brushless liquid spraying unit (12) comprises a connecting arm (1201) slidably bolted to the surface of the secondary swing arm (9), a frame (1202) fixed between the two connecting arms (1201), and a water tank (1203) fixed at the top of the frame (1202), brushless pumping mechanisms (1204) being installed on both sides of the bottom of the water tank (1203), and a bidirectional liquid spraying mechanism (1205) interconnected with the liquid outlet end of the brushless pumping mechanism (1204) being installed on the back of the frame (1202).

2. The device for a plant pest control drone according to claim 1, characterized in that: The inverted U-shaped support frame (5) comprises a straight-mouth connection plate (502) bolted to one side of the bottom end of the agricultural and forestry UAV body (1), and two symmetrical right-angle support frames (501) welded to the bottom end of the straight-mouth connection plate (502), and the driving shaft (7) is rotatably mounted inside the right-angle support frames (501) via a bearing seat.

3. The device for a plant pest control drone according to claim 1, characterized in that: The first-level double-layer swing arm (8) comprises a front clamping plate (801) fixed to one end of the surface of the driving shaft (7), a double dovetail profile arm (802) fixed to an outer wall on one side of the front clamping plate (801), and a rear support (803) fixed to the top end of the double dovetail profile arm (802), and an outer wall on one side of the rear support (803) and the top end of the second-level swing arm (9) are connected to each other via a hinge shaft.

4. The device for a plant pest control drone according to claim 2, characterized in that: The right-angle support frame (501) and the straight-mouth connection plate (502) are made of components made of aluminum alloy, and a plurality of internal thread holes are arranged on the surface of the straight-mouth connection plate (502).

5. The device for plant pest control drone according to claim 1, characterized in that: The first screw push-pull mechanism (10) comprises vertical bearing seats fixed on both sides of the top end of the first double-layer swing arm (8), a one-way screw (1002) rotatably mounted between the two vertical bearing seats, and a first nut pair (1003) mounted on a threaded portion at one end of the surface of the one-way screw (1002); a support rod (1005) is fixed on the outer wall of the side of the inverted U-shaped support frame (5) close to the first double-layer swing arm (8); a connecting rod (1004) is rotatably mounted on one end of the surface of the support rod (1005); an end of the connecting rod (1004) away from the support rod (1005) is hingedly connected to an outer wall of one side of the first nut pair (1003); the first screw push-pull mechanism (10) further comprises a pulley servo drive unit (1001) mounted on one side of the top end of the first double-layer swing arm (8); the pulley servo drive unit (1001) is used to drive the one-way screw (1002) to rotate.

6. The device for a plant pest control drone according to claim 1, characterized in that: The second screw push-pull mechanism (11) comprises vertical bearing seats fixed on both sides of the bottom end of the first double-layer swing arm (8), a one-way screw second (1102) rotatably mounted between the two vertical bearing seats, and a second nut pair (1103) fitted on the threaded portion of one end of the surface of the one-way screw second (1102), a limit rod (1104) being hingedly connected to the front and rear outer walls of the second nut pair (1103), one end of the connecting rod (1004) being hingedly connected to the bottom end of the second double-layer swing arm (9), and a pulley servo drive unit second (1101) for driving the one-way screw second (1102) to rotate being installed on the other side of the bottom end of the first double-layer swing arm (8).

7. The device for a plant pest control drone according to claim 5, characterized in that: The pulley servo drive unit 1 (1001) comprises a motor seat mounted on one side of the top end of the first-stage double-layer swing arm (8), a servo motor mounted inside the motor seat, and a crawler transmission structure mounted on the output end of the servo motor for driving the one-way screw rod 1 (1002) to rotate.

8. The device for a plant pest control drone according to claim 7, characterized in that: The brushless pumping mechanism (1204) is composed of a brushless DC water pump (12041) installed at the liquid outlet of the water tank (1203) and a liquid collecting pipe (12042) installed at the output end of the brushless DC water pump (12041); the bidirectional liquid spraying mechanism (1205) comprises a three-way pipe (12051) installed at the bottom end of the liquid collecting pipe (12042), liquid dispensing pipes (12052) installed at both sides of the top end of the three-way pipe (12051), and a plurality of nozzles (12053) installed at equal intervals on the outer wall of one side of the liquid dispensing pipe (12052).

9. A method for using a plant pest control drone, comprising the device for using a plant pest control drone as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S101: Using the agricultural and forestry drone body (1), the inverted U-shaped support frame (5), the two-stage adjustable extension module (6), and the multi-line brushless spray unit (12) are carried to a location where crops are to be sprayed; S102: The staff adjusts the relative spraying angle and height between two adjacent multi-line brushless spraying units (12) through the secondary adjustable extension module (6) according to the on-site environmental wind speed, crop growth status and terrain changes; S103: The first screw push-pull mechanism (10) supports and rotates the first double-layer swing arm (8), thereby preliminarily adjusting the working angles of the first double-layer swing arm (8), the second swing arm (9) and the multi-line brushless spray unit (12). Since the second swing arm (9) is hingedly mounted on the first double-layer swing arm (8), the second screw push-pull mechanism (11) controls the swing amplitude and posture of the second swing arm (9) again by mechanical push-pull, thereby adjusting the spraying height and angle of the multi-line brushless spray unit (12); S104: During the flight of the agricultural and forestry drone body (1) and the multi-line brushless spray unit (12), the multi-line brushless spray unit (12) continuously sprays the pesticide downwards, and the downward wind force generated by the electric propeller (3) causes the pesticide to cover the crops, thereby achieving precise pesticide application.

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