A plant protection drone

Abstract

The present invention belongs to the technical field of unmanned aerial vehicles, and specifically relates to a plant protection unmanned aerial vehicle, including a fuselage, a landing gear, a short arm and a long arm. There are multiple short arms and they are arranged around the fuselage. There are two long arms, which are parallel to each other and are respectively arranged on the front and rear sides of the fuselage. One end of the short arm is fixedly connected to the fuselage, and the other end is provided with a first rotor assembly and fixedly connected to the long arm; the two ends of the long arm are respectively provided with a second rotor assembly, and the bottom of each rotor assembly is provided with a spraying device; the top support of the landing gear is connected to the bottom of the long arm. The plant protection unmanned aerial vehicle provided by the present invention has a reasonable overall structural layout, adopts a multi-rotor special-shaped layout, has a large load capacity, and ensures the overall strength of the body structure under the condition of increasing the spray width; compared with conventional multi-rotor unmanned aerial vehicles, under the same load condition, the spray width is larger, the spraying efficiency is higher, which is conducive to saving plant protection operation time and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles (UAVs), and in particular to a plant protection UAV. Background Art

[0002] A drone is an unmanned aerial vehicle controlled by a radio remote control device or its own program control device. With the rapid development of the drone industry, more and more drones are being used in agriculture, forestry, electricity, surveying and mapping, telemetry and other industries. With the increasing maturity of drone technology and the popularization of modern agricultural concepts, the application of plant protection drones is becoming more and more extensive. Using plant protection drones to spray pesticides can not only save manpower and material resources, but also keep away from remote control operations, avoid spraying workers from contacting pesticides, and improve the safety and spraying efficiency of pesticide spraying operations.

[0003] Existing plant protection UAVs usually include a fuselage and multiple arms arranged around the fuselage. Most plant protection UAVs are quad-axis, one end of the arm is fixedly connected to the fuselage, and a nozzle is installed at the bottom of the other end. Plant protection UAVs with this structure have a small wheelbase, a load capacity of basically less than 10 kg, and a narrow spray width, which is difficult to meet the current plant protection operation needs. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a plant protection UAV with a large wheelbase and load capacity, a wide spraying width, and a high overall frame strength.

[0005] In order to achieve the above-mentioned technical effect, the present invention adopts the following technical scheme: a plant protection UAV, comprising a fuselage, a landing gear, a short arm and a long arm, wherein there are multiple short arms and they are arranged around the fuselage, there are two long arms, the two long arms are parallel to each other and are respectively arranged on the front and rear sides of the fuselage, one end of the short arm is fixedly connected to the fuselage, and the other end is provided with a first rotor assembly and fixedly connected to the long arm; second rotor assemblies are respectively provided at both ends of the long arm, and a spraying device is provided at the bottom of each rotor assembly; the top support of the landing gear is connected to the bottom of the long arm.

[0006] The plant protection UAV provided by the present invention adopts a special special-shaped rotor layout structure, a plurality of short arms are arranged around the fuselage, and two parallel long arms are respectively arranged on the front and rear sides of the fuselage. While increasing the load, the spray width is increased. One end of the short arm is connected to the fuselage, and the other end is supported and fixed on the long arm. The overall structural layout is reasonable and the strength is high, which greatly improves the working efficiency.

[0007] As a structural improvement of the present invention, the long arm is multi-section, including at least a middle arm and segmented arms connected to both sides of the middle arm, and the segmented arms on both sides are symmetrically arranged relative to the center line of the fuselage. The long arm is multi-section, which is convenient for replacement and maintenance, and only a damaged segment of the arm needs to be replaced, saving costs.

[0008] As a preferred structure of the present invention, the segmented machine arm and the middle machine arm are fixedly connected by a first pipe clamp, which is convenient and quick to fix, easy to assemble and disassemble, and firmly fixed.

[0009] As a structural improvement of the present invention, the landing gear includes two "U-shaped" brackets symmetrically arranged on both sides of the fuselage and a first connecting frame connecting the two "U-shaped" brackets. The two ends of the top of the "U-shaped" bracket are respectively connected to the two long arms in front and behind the fuselage through mounting parts. The use of the "U-shaped" bracket increases the contact area with the ground, provides stable support, has a large load-bearing capacity, and has high impact resistance. Compared with other types of landing gear, it has higher structural strength and longer service life. The two ends of the first connecting frame are respectively connected to the bottom of the two "U-shaped" brackets, which is beneficial to enhancing the overall strength of the landing gear.

[0010] As a structural improvement of the present invention, the mounting part includes a fixing part connected to the "U-shaped" bracket and a clamping ring connected to the long machine arm; the fixing part includes a sleeve for inserting and fixing one end of the top of the "U-shaped" bracket, and a fixing platform is extended outward from one side wall of the sleeve, and an arc-shaped fixing block is provided on the fixing platform. The clamping ring matches the machine arm and is clamped on the machine arm, and the two ends of the clamping ring are respectively fixedly connected to the two side surfaces of the arc-shaped fixing block.

[0011] As a structural improvement of the present invention, the landing gear further includes a second connecting frame connecting the two ends of the top of the "U-shaped" bracket, and the two ends of the second connecting frame are respectively plugged into the sockets provided in the fixing platform; and further includes a medicine box, the top of the medicine box is fixedly connected to the second connecting frame, and the bottom of the medicine box is supported by the first connecting frame. The second connecting frame increases the strength of the "U-shaped" bracket, improves the load-bearing capacity of the landing gear, and can disperse the impact force on the mounting parts, reducing the probability of damage to the mounting parts.

[0012] Preferably, both ends of the first connecting frame are connected to the “U-shaped” bracket via “T”-shaped connecting frames respectively.

[0013] As a structural improvement of the present invention, the first rotor assembly includes a motor seat, a motor and a propeller, the motor is fixed on the motor seat, and the propeller is connected to the output shaft of the motor; the motor seat includes a fixing seat, one end of which is extended with a second pipe clamp, and the second pipe clamp is used for clamping and fixing with the short machine arm; a mounting seat is extended at the bottom of the fixing seat, and four arc-shaped connecting parts are spaced apart at the bottom of the mounting seat, and the mounting seat is supported on the long machine arm through two opposite arc-shaped connecting parts, and is fixedly connected with the long machine arm after being clamped and matched with a semi-annular tube arranged around the bottom of the long machine arm.

[0014] As a structural improvement of the present invention, the segmented machine arm includes a main machine arm and a supporting machine arm, one end of the main machine arm is connected to the middle machine arm, and the other end is connected to the supporting machine arm through a folding mechanism.

[0015] Furthermore, the folding mechanism includes a first folding piece, a second folding piece and a sleeve, the second folding piece is rotatably folded relative to the first folding piece; the first folding piece and the second folding piece are rotated and docked to form a complete cylinder, and the sleeve is screwed and sleeved on the first folding piece and the second folding piece; a first half thread is provided on the outer wall of the first folding piece, and a second half thread is provided on the outer wall of the second folding piece, the first half thread and the second half thread form a full circle of thread, and the inner wall of the sleeve is provided with an internal thread corresponding to the full circle of thread.

[0016] The above technical scheme has the following beneficial effects: the plant protection UAV provided by the present invention has a reasonable overall structural layout, adopts a multi-rotor special-shaped layout, has a large load capacity, and ensures the overall strength of the body structure while increasing the spray width; compared with conventional multi-rotor UAVs, the spray width is larger and the spraying efficiency is higher under the same load condition, which is beneficial to saving plant protection operation time and cost; the landing gear has high strength, is easy to install, has stable support, can effectively alleviate the impact force during landing, and has a long service life; the arm can be rotated and folded, occupies little space, and is convenient for transportation and storage of the UAV. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the plant protection UAV provided by the present invention;

[0018] Figure 2 This is a top view of the plant protection drone provided by the present invention;

[0019] Figure 3 This is a schematic diagram of the landing gear structure of the plant protection UAV provided by the present invention;

[0020] Figure 4 for Figure 3 The schematic diagram of the local enlarged structure at D in the middle;

[0021] Figure 5 for Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0022] Figure 6 for Figure 1 A schematic diagram of the partially enlarged structure at B in the middle;

[0023] Figure 7 for Figure 1 Schematic diagram of the separated structure of the folding mechanism at C in the middle;

[0024] Figure 8 It is a structural schematic diagram of the first folding member in the folding mechanism provided by the present invention;

[0025] Fig. 9 for Figure 8 Schematic diagram of the structure in direction A.

[0026] In the figure:

[0027] 1. Fuselage; 2. Landing gear; 2.1. "U-shaped" bracket; 2.2. First connecting frame; 2.3. Second connecting frame; 2.4. "T"-shaped connecting frame; 3. Short arm; 4. Long arm; 4.1. Middle arm; 4.2. Section arm; 4.21. Main arm; 4.22. Support arm;

[0028] 5. Folding mechanism; 5.1. First tubular portion; 5.2. First connecting portion; 5.3. Sleeve; 5.4. Second tubular portion; 5.5. Mounting platform; 5.51. Rotating groove; 5.6. Second connecting portion; 5.61. Rotating portion; 5.7. Sealing ring; 5.8. Stop platform; 5.81. Outer groove wall; 5.82. Inner groove wall; 5.83. Groove; 5.84. Reinforcement teeth;

[0029] 6. Medicine box; 7. Mounting parts; 7.1. Casing; 7.2. Fixing table; 7.3. Arc-shaped fixing block; 7.4. Clamping ring; 8. Motor seat; 8.1. Fixing seat; 8.2. Mounting seat; 8.21. Arc-shaped connecting part; 8.3. Second pipe clamp; 9. Semi-annular pipe; 10. Spray rod; 11. First pipe clamp;. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the terms "installed", "set", "provided with", "connected", "connected" and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Unless otherwise specified, "plurality" means two or more.

[0035] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] Existing plant protection drones usually include a fuselage and multiple arms arranged around the fuselage. The ends of the arms are provided with rotor assemblies, and spraying devices are provided under the rotor assemblies. In order to increase the spraying width, two cross bars are usually connected under the fuselage. The cross bars are perpendicular to the center line of the nose. Spraying devices are provided at the ends of the cross bars. The distance between the two ends of the cross bars is greater than the original spraying width, thereby achieving the purpose of increasing the spray width. However, the liquid sprayed by the spraying device on the cross bar will be affected by the wind field generated by the rotor assemblies on the arms on both sides of the front and rear sides, so that the liquid amount drifts seriously, resulting in uneven spraying, wasting liquid, and affecting the effect of plant protection operations. There are also some plant protection drones with extended arms to increase the spraying width, but because one end of the arm is connected to the fuselage and the other end is suspended in the air, if the arm is too long, during the flight of the drone, the vibration generated by the operation of the rotor assemblies on each arm is large, affecting the working state of the flight controller, and then affecting the stable flight of the drone. Moreover, if the arm is too long, it is easy to be damaged after long-term flight, and the service life is short.

[0038] The present embodiment provides a plant protection UAV, refer to the figure, including a fuselage 1, a landing gear 2, a short arm 3 and a long arm 4. There are multiple short arms 3 and they are arranged around the fuselage 1. In the present embodiment, four arms are arranged, and there are two long arms 4. The two long arms are parallel to each other and are respectively arranged on the front and rear sides of the fuselage. One end of the short arm 3 is fixedly connected to the fuselage, and the other end is provided with a first rotor assembly and fixedly connected to the long arm; the two ends of the long arm are respectively provided with a second rotor assembly, and a spraying device is provided at the bottom of each rotor assembly, and the spraying device includes a spray rod 10 and a nozzle arranged at the bottom of the spray rod 10; the top support of the landing gear 2 is connected to the bottom of the long arm 4.

[0039] The plant protection UAV provided in this embodiment adopts a special special-shaped rotor layout structure. A plurality of short arms 3 are arranged around the fuselage, and two parallel long arms 4 are respectively arranged on the front and rear sides of the fuselage 1. While increasing the load, the spray width is increased. One end of the short arm 3 is connected to the fuselage 1, and the other end is supported and fixed on the long arm 4, which reduces the vibration generated by the rotor assembly on the short arm 3 during operation, thereby reducing the influence of the vibration of the rotor assembly on the flight controller, which is conducive to the stable flight of the UAV. The overall structural layout is reasonable and the strength is high, which greatly improves the operation efficiency.

[0040] The long arm is multi-section, including at least a middle arm 4.1 and segmented arms 4.2 connected to both sides of the middle arm 4.1, and the segmented arms 4.2 on both sides are symmetrically arranged relative to the center line of the fuselage 1. The long arm is multi-section, which is convenient for replacement and maintenance, and only a damaged arm section needs to be replaced, saving costs.

[0041] The length of the middle arm 4.1 is greater than the width of the fuselage, and the top of the landing gear 2 is fixedly connected to the middle arm 4.1. Even if the middle arm is damaged due to the impact when the landing gear lands, only the middle arm needs to be replaced and repaired, and the other arms can be used normally, which greatly saves the maintenance cost; the rotor assembly at the end of the short arm is fixed on the segmented arm, and four rotor assemblies are arranged on the long arm at equal intervals. The wind field generated by each adjacent rotor assembly will not affect the spraying effect of the spraying device under another rotor assembly, thereby avoiding the drift of the liquid medicine.

[0042] The segmented machine arm 4.2 and the middle machine arm 4.1 are fixedly connected by a first pipe clamp 11. The fixing is convenient and quick, easy to assemble and disassemble, and the fixing is firm. The first pipe clamp includes a clamping tubular body, one side of the clamping tubular body is provided with a strip-shaped through groove, and two parallel clamping blocks are extended outward from the two groove walls of the strip-shaped through groove. One end of the segmented machine arm and one end of the middle machine arm are respectively inserted into the clamping tubular body and butted against each other, and are locked and fixed by a connecting piece passing through the two clamping blocks. The segmented machine arm and the middle machine arm are connected by the first pipe clamp, and the butt fixation of the two can be achieved without changing the structure of the two sections of the machine arm itself. The connection is firm, and the assembly and disassembly is convenient and quick.

[0043] Embodiment 2:

[0044] On the basis of the first embodiment, in order to improve the landing stability of the UAV, the landing gear 2 provided in this embodiment includes two "U-shaped" brackets 2.1 symmetrically arranged on both sides of the fuselage and a first connecting frame 2.2 connecting the two "U-shaped" brackets. The two ends of the top of the "U-shaped" bracket are respectively connected to the two long arms in front and behind the fuselage through the mounting member 7. The use of the "U-shaped" bracket increases the contact area with the ground, provides stable support, has a large load-bearing capacity, and has high impact resistance. Compared with other types of landing gear, it has higher structural strength and longer service life. The two ends of the first connecting frame 2.2 are respectively connected to the bottom of the two "U-shaped" brackets 2.1, which is conducive to enhancing the overall strength of the landing gear.

[0045] The side brackets on both sides of the "U-shaped" bracket 2.1 include an upper vertical section and a lower inclined section. The upper vertical section is perpendicular to the long arm 4, and the lower inclined section gradually tilts outward. The sides of the two "U-shaped" brackets form an eight-shaped shape, which is beneficial to reducing the impact force on the landing gear when the UAV lands, further improving the landing stability of the UAV.

[0046] As a structural improvement of the present invention, the mounting member 7 includes a fixing member connected to the "U-shaped" bracket 2.1 and a clamping ring 7.4 connected to the long machine arm; the fixing member includes a sleeve 7.1 for inserting and fixing one end of the top of the "U-shaped" bracket, a fixing platform 7.2 extending outward from one side wall of the sleeve, an arc-shaped fixing block 7.3 provided on the fixing platform 7.2, the clamping ring 7.4 matches the long machine arm and is arranged to clamp the long machine arm, and the two ends of the clamping ring 7.4 are respectively fixedly connected to the two side surfaces of the arc-shaped fixing block 7.3. The two ends of the top of the "U-shaped" bracket are respectively connected to the machine arm through the mounting member, and the clamping ring connected to the machine arm in the mounting member is located on one side of the sleeve fixedly connected to the "U-shaped" bracket, so that when the tripod is subjected to a large external impact force when landing, the sleeve bears most of the impact force, and the connection between the clamping ring and the fixing platform is deformed and damaged, absorbing the large impact force, thereby reducing the damage to the machine arm caused by the impact force.

[0047] The landing gear 2 also includes a second connecting frame 2.3 connecting the two ends of the top of the "U-shaped" bracket, and the two ends of the second connecting frame 2.3 are respectively inserted into the sockets set in the fixed platform; it also includes a medicine box 6, the top of the medicine box 6 is fixedly connected to the second connecting frame 2.3, and the bottom of the medicine box is supported by the first connecting frame 2.2. The second connecting frame 2.3 increases the strength of the "U-shaped" bracket, improves the load-bearing capacity of the landing gear, and can disperse the impact force on the mounting parts, reducing the probability of damage to the mounting parts. Preferably, the two ends of the first connecting frame are connected to the "U-shaped" bracket through a "T"-shaped connecting frame 2.4.

[0048] The first rotor assembly includes a motor seat 8, a motor and a propeller, wherein the motor is fixed on the motor seat, and the propeller is connected to the output shaft of the motor; the motor seat includes a fixing seat 8.1, and a second pipe clamp 8.3 is extended from one end of the fixing seat, and the second pipe clamp is used to clamp and fix with the short machine arm; a mounting seat 8.2 is extended from the bottom of the fixing seat, and four arc-shaped connecting parts 8.21 are spaced apart at the bottom of the mounting seat 8.2, and the mounting seat 8.2 is supported on the long machine arm through two opposite arc-shaped connecting parts, and is fixedly connected with the long machine arm after being clamped and matched with the semi-circular tube 9 arranged around the bottom of the long machine arm. The arc-shaped connecting part adapted to the shape of the long machine arm is fitted with the upper surface of the long machine arm, and the semi-circular tube is fitted with the lower surface of the long machine arm. The arc-shaped connecting part of the mounting seat cooperates with the semi-circular tube to clamp the long machine arm therein, which is conducive to the stable installation of the motor seat on the long machine arm, and has a great effect on reducing the vibration generated when the rotor assembly is running.

[0049] The fixing seat at the bottom of the motor base of the first rotor assembly is fixedly installed on the long machine arm. The long machine arm supports the first rotor assembly, thereby reducing the vibration generated by the operation of the first rotor assembly. Since the first rotor assembly is fixed on the short machine arm, the short machine arm is connected to the fuselage, and a flight controller is arranged in the fuselage, the sensor in the flight controller is easily affected by the vibration and reduces the measurement accuracy. The present invention fixes the rotor assembly to the long machine arm through the mounting seat, which greatly reduces the influence of the vibration generated by the operation of the rotor assembly on the flight controller. On the other hand, it reduces the shock absorption requirements for the flight controller, which not only reduces the cost but also improves the measurement accuracy of the sensor in the flight controller.

[0050] Embodiment three:

[0051] On the basis of embodiments one and two, in order to reduce the space occupied by the plant protection drone during storage or transportation, the long arm is set as a folding arm. The existing I-shaped folding arm includes two sections of the arm. The two sections of the arm are connected at one side, and the other side is fixedly connected by a connecting piece. When the arm needs to be folded, the connecting piece is removed and the two sections of the arm are rotated and folded. The folding structure of this folding arm is unstable and prone to breakage.

[0052] In this embodiment, the segmented machine arm includes a main machine arm 4.21 and a supporting machine arm 4.22, one end of the main machine arm 4.21 is connected to the middle machine arm 4.1, and the other end is connected to the supporting machine arm 4.22 through a folding mechanism 5. The folding mechanism includes a first folding member, a second folding member and a sleeve 5.3, the second folding member is rotated and folded relative to the first folding member; the first folding member and the second folding member are rotated and docked to form a complete cylinder, and the sleeve 5.3 is screwed and sleeved on the first folding member and the second folding member; the first folding member is provided with a first half thread on the outer wall, and the second folding member is provided with a second half thread on the outer wall, the first half thread and the second half thread form a full circle thread, and the inner wall of the sleeve is provided with an internal thread corresponding to the full circle thread.

[0053] The first folding piece is fixedly connected to the main machine arm, and the second folding piece is connected to the support machine arm. The connection method is not limited and can be glued. The sleeve is used to fix the first folding piece and the second folding piece that are rotatably connected.

[0054] Specifically, the outer wall of the first folding member extends outwardly with a mounting platform 5.5, and the mounting platform 5.5 is provided with a rotation groove 5.51, and one end of the second folding member is rotatably connected to the rotation groove 5.51. The first folding member includes a first tubular portion 5.1, and the outer wall of one end of the first tubular portion 5.1 extends outwardly with a first connecting portion 5.2; the second folding member includes a second tubular portion 5.4 and a second connecting portion 5.6 arranged outside the first tubular portion 5.4, and the first connecting portion 5.2 and the second connecting portion 5.6 are rotated and docked to form a complete cylinder, and the first half thread is arranged on the outer wall of the first tubular portion, and the second half thread is arranged on the outer wall of the second connecting portion 5.6. One end of the main arm of the drone is inserted into the first tubular portion 5.1 of the first folding member, and the other end is connected to the fuselage, and one end of the support arm is inserted into the second tubular portion 5.4 of the second folding member. Since the main arm and the support arm are fixedly connected to the first folding member and the second folding member respectively, by rotating the second folding member relative to the first folding member, the support arm is rotated and folded relative to the main arm.

[0055] In this embodiment, the segmented arm is folded in the long arm, and the main arm and the supporting arm are connected by a folding mechanism. The first folding member and the second folding member of the folding mechanism are respectively provided with tubular parts matching with the main arm and the supporting arm. One end of the main arm is inserted into the first tubular part of the first folding member, and one end of the supporting arm is inserted into the second tubular part of the second folding member. The first folding member and the second folding member respectively include a first connecting part and a second connecting part. The first connecting part is connected to the first tubular part, and the second connecting part is connected to the second tubular part. The first connecting part and the second connecting part are fixed by a sleeve, so that the main arm and the supporting arm are fixedly connected. This folding mechanism is provided with a first connecting part connected to the first tubular part and a second connecting part connected to the second tubular part, which strengthens the strength of the folding mechanism. Compared with the fixing method of bolts, screws and other connecting parts, the sleeve is tightened and fixed, and the fixing is more reliable due to the large contact area, and the disassembly and assembly are convenient and quick.

[0056] A rotating portion 5.61 extends outward from one end of the second connecting portion and is connected to one end of the second tubular portion 5.6. The rotating portion 5.61 is rotatably connected to the rotating groove 5.51 via a rotating shaft. The rotating groove includes an upper groove wall and a lower groove wall, each of which is provided with a through hole. The rotating portion is rotatably connected to the rotating groove via a rotating shaft passing therethrough.

[0057] In order to increase the waterproof sealing effect of the machine arm and the buffering and shock-absorbing effect of the machine arm, a circle of stop platform 5.8 extends inward from the inner wall at the connection between the first tubular part and the first connecting part, and the end of the second tubular part of the second folding part abuts against the stop platform. A circle of grooves 5.83 is provided on the stop platform, and a sealing ring 5.7 is provided in the groove.

[0058] The groove includes an inner groove wall 5.82 and an outer groove wall 5.81. In order to increase the strength of the machine arm, a reinforcing gear ring protrudes inward along the circumferential direction on the outer groove wall 5.81, and a groove is formed between adjacent reinforcing teeth 5.84 in the reinforcing gear ring. The sealing ring 5.7 is embedded between the reinforcing gear ring and the inner groove wall 5.82.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plant protection drone, characterized in that: The invention comprises a fuselage (1), a landing gear (2), a short arm (3) and a long arm (4), wherein the short arms (3) are provided in plurality and are arranged around the fuselage (1), the long arms (4) are provided in plurality, the two long arms (4) are parallel to each other and are respectively arranged at the front and rear sides of the fuselage (1), one end of the short arm (3) is fixedly connected to the fuselage (1), and the other end is provided with a first rotor assembly and is fixedly connected to the long arm (4); the two ends of the long arm (4) are respectively provided with a second rotor assembly, and the bottom of each rotor assembly is provided with a spraying device; the top support of the landing gear (2) is connected to the bottom of the long arm (4); The first rotor assembly comprises a motor seat (8), a motor and a propeller, wherein the motor is fixed on the motor seat (8), and the propeller is connected to the output shaft of the motor; the motor seat comprises a fixing seat (8.1), one end of which is extended with a second pipe clamp (8.3), and the second pipe clamp (8.3) is used for clamping and fixing with the short machine arm (3); a mounting seat (8.2) is extended at the bottom of the fixing seat (8.1), and four arc-shaped connecting parts (8.21) are spaced apart at the bottom of the mounting seat (8.2); the mounting seat (8.2) is supported on the long machine arm (4) through two opposing arc-shaped connecting parts (8.21), and is fixedly connected with the long machine arm (4) after being clamped and matched with a semi-annular tube (9) arranged around the bottom of the long machine arm (4); The long machine arm (4) is of a multi-section type, comprising at least a middle machine arm (4.1) and segmented machine arms (4.2) connected to both sides of the middle machine arm (4.1), and the segmented machine arms (4.2) on both sides are symmetrically arranged relative to the center line of the fuselage (1); The segmented machine arm (4.2) and the middle machine arm (4.1) are fixedly connected via a first pipe clamp (11).

2. The plant protection drone according to claim 1, characterized in that: The landing gear (2) comprises two "U-shaped" brackets (2.1) symmetrically arranged on both sides of the fuselage and a first connecting frame (2.2) connecting the two "U-shaped" brackets (2.1), and the two ends of the top of the "U-shaped" bracket (2.1) are respectively connected to two long arms (4) at the front and rear of the fuselage (1) through mounting parts (7).

3. The plant protection drone according to claim 2, characterized in that: The mounting member (7) comprises a fixing member connected to the "U-shaped" bracket (2.1) and a clamping ring (7.4) connected to the long machine arm; the fixing member comprises a sleeve (7.1) into which one end of the top of the "U-shaped" bracket (2.1) is inserted and fixed, a fixing platform (7.2) extending outward from a side wall of the sleeve (7.1), an arc-shaped fixing block (7.3) being provided on the fixing platform (7.2), the clamping ring (7.4) matching the long machine arm (4) and being arranged to clamp the long machine arm, and two ends of the clamping ring (7.4) are respectively fixedly connected to two side surfaces of the arc-shaped fixing block (7.3).

4. The plant protection drone according to claim 3, characterized in that: The landing gear (2) further comprises a second connecting frame (2.3) connecting the two ends of the top of the "U-shaped" bracket (2.1), the two ends of the second connecting frame (2.3) being respectively plugged into sockets provided in the fixing platform (7.2); and further comprises a medicine box (6), the top of the medicine box (6) being fixedly connected to the second connecting frame (2.3), and the bottom of the medicine box (6) being supported by the first connecting frame (2.2).

5. The plant protection drone according to claim 2, characterized in that: Both ends of the first connecting frame (2.2) are connected to the "U-shaped" bracket (2.1) via "T"-shaped connecting frames (2.4) respectively.

6. The plant protection drone according to claim 1, characterized in that: The segmented machine arm (4.2) comprises a main machine arm (4.21) and a supporting machine arm (4.22); one end of the main machine arm (4.21) is connected to the middle machine arm (4.1), and the other end is connected to the supporting machine arm (4.22) via a folding mechanism (5).

7. The plant protection drone according to claim 6, characterized in that: The folding mechanism comprises a first folding piece, a second folding piece and a sleeve, the second folding piece is rotatably folded relative to the first folding piece; the first folding piece and the second folding piece are rotatably docked to form a complete cylinder, the sleeve (5.3) is screwed and sleeved on the first folding piece and the second folding piece; the first folding piece is provided with a first half thread on the outer wall, the second folding piece is provided with a second half thread on the outer wall, the first half thread and the second half thread form a full circle thread, and the inner wall of the sleeve is provided with an internal thread corresponding to the full circle thread.

Images