A spray assembly for a firefighting drone

Abstract

This invention belongs to the field of unmanned aerial vehicle (UAV) technology and discloses a spraying component for a fire-fighting UAV. The component includes a UAV body and a water pipe connected inside the UAV body, and further includes a storage mechanism located at the bottom of the UAV body for storing and folding a portion of the water pipe. The invention uses an electric cylinder to drive a connecting plate to rotate 90 degrees at its hinge with a third positioning plate. At this point, the nozzle inside the movable ring connects with the straight pipe. Subsequently, a drive motor drives a first gear to rotate, which in turn drives a second gear. The second gear, through a second positioning arc plate, drives the first positioning arc plate to rotate, thereby causing the connecting circular plate to rotate. During this rotation, the movable ring, under the action of a spring, abuts against the straight pipe and is threadedly connected to it. This allows for the connection of different types of nozzles to the outside of the straight pipe, achieving variations in the water spray pattern to adapt to different fire conditions.

Description

Technical Field

[0001] This invention belongs to the field of unmanned aerial vehicle (UAV) technology, specifically a spray component for a fire-fighting UAV. Background Technology

[0002] In firefighting operations, drones are used to achieve multi-directional spraying fire suppression in order to improve fire extinguishing efficiency. When existing firefighting drones are used for fire suppression, the fire nozzles are usually pre-installed by firefighters. Only one type of nozzle can be used in a single flight. However, the fire situation changes over time. When the spraying method needs to be changed in response to the change in the fire situation, the existing firefighting drones cannot handle it. Therefore, improvements are needed to address the above problems. Summary of the Invention

[0003] To address the problem mentioned in the background art that existing firefighting drones are unable to adapt to changes in fire conditions and require different spray patterns, this invention provides a spraying component for a firefighting drone.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a spraying assembly for a fire-fighting drone, comprising a drone body and a water pipe connected inside the drone body, and further comprising:

[0005] A storage mechanism is provided at the bottom of the drone body and is used to store and fold part of the water pipes;

[0006] An extension mechanism is provided at the bottom of the storage mechanism and is used to change the distance between the water pipe nozzle and the drone body;

[0007] A pushing mechanism, which is disposed on the extension mechanism and is used to change the length of the extension mechanism;

[0008] A driving mechanism and a rotating mechanism are provided, wherein the driving mechanism is disposed at the end of the extension mechanism, the rotating mechanism is disposed at the end of the extension mechanism, and the driving mechanism is used to drive the rotating mechanism to rotate.

[0009] An adjustment mechanism and a nozzle are provided. The adjustment mechanism is located at the end of the extension mechanism, and the nozzle is located inside the adjustment mechanism. The adjustment mechanism is used to connect different nozzles to the extension mechanism.

[0010] Preferably, the storage mechanism includes a storage compartment, a movable support, a bending assembly, a guide tube, and a sliding opening. The storage compartment is installed at the bottom of the drone body, the movable support is hinged to both sides of the storage compartment, the bending assembly is staggered inside the storage compartment and limits part of the water pipe into an "S" shape, the guide tube is installed at the bottom of the storage compartment, and the sliding opening is opened on the side of the storage compartment for the passage of the bending assembly.

[0011] Preferably, the movable support includes a movable seat and a movable rod, the movable rod slides inside the movable seat, the movable seat is hinged to the storage compartment, and the movable seat can close the sliding opening when it is parallel to the storage compartment.

[0012] Preferably, the bending assembly includes a sliding block, a sliding seat, a rolling block, and an elastic element. The sliding block slides horizontally inside the storage compartment. A sliding seat is installed on one side of the sliding block and slides elastically inside the storage compartment via the elastic element. One end of the sliding seat is provided with an inclined surface. The rolling block is rotatably connected to the middle of the sliding block, and the surface of the rolling block is in contact with the water pipe.

[0013] Preferably, the extension mechanism includes a first positioning plate, a first slide, a second slide, a third slide, and a straight tube. The first positioning plate is installed at the end of the guide tube. The first slide is fixedly connected to the first positioning plate. The first slide, the second slide, and the third slide are slidably connected to each other. The straight tube is fixedly connected to the third slide.

[0014] Preferably, the pushing mechanism includes an electric telescopic rod and a connecting frame. The electric telescopic rod is symmetrically installed at both ends of the first positioning plate. The movable end of the electric telescopic rod is connected to a connecting frame installed on the surface of the straight pipe. The connecting frame is hinged to the movable rod.

[0015] Preferably, the driving mechanism includes a connecting seat, a driving motor, and a first gear. The driving motor is mounted on the surface of the straight tube via the connecting seat, and the first gear is mounted on the output shaft of the driving motor.

[0016] Preferably, the adjusting mechanism includes a second positioning plate, a third positioning plate, a connecting plate, a limiting ring, a connecting circular plate, a movable ring, a first positioning arc plate, and an electric cylinder. The second and third positioning plates are both mounted on the surface of the straight pipe. The connecting plate is symmetrically hinged to both ends of the third positioning plate. The outer end of the limiting ring is fixedly connected to the connecting plate, and the inner end is rotatably connected to the connecting circular plate through a bearing. The middle part of the connecting circular plate is elastically slidably connected to the movable ring through a spring. The first positioning arc plate is fixedly mounted in a ring on the side of the connecting circular plate. One end of the electric cylinder is hinged to the second positioning plate, and the other end is hinged to the connecting plate. The nozzle is mounted in the middle of the movable ring.

[0017] Preferably, the rotating mechanism includes a second gear and a second positioning arc plate, the second gear being rotatably connected to the surface of the straight tube via a bearing, and the second positioning arc plate being annularly mounted on the side of the second gear;

[0018] When the nozzle is connected to the straight pipe, the second gear and the first positioning arc plate are spaced apart, and there is a gap between them.

[0019] Preferably, a first magnetic block is installed on the limiting ring, and a second magnetic block is installed on the connecting circular plate, and the first magnetic block and the second magnetic block are attracted by magnetic force.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention uses an electric cylinder to drive the connecting plate to rotate 90 degrees at the hinge point with the third positioning plate. At this time, the nozzle located inside the movable ring connects with the straight pipe. Then, the drive motor drives the first gear to rotate, the first gear drives the second gear to rotate, and the second gear drives the first positioning arc plate to rotate through the second positioning arc plate, thereby causing the connecting circular plate to rotate. At this time, the movable ring abuts against the straight pipe under the action of the spring and is threadedly connected to the straight pipe during rotation. Different types of nozzles can be connected to the outside of the straight pipe to realize the change of water flow pattern and adapt to different fire conditions.

[0022] This invention uses an electric telescopic rod to move the connecting frame, thereby causing the sleeve formed by the first, second, and third slides to extend and the movable support to rotate. At this time, multiple sets of bending components inside the storage compartment move from bottom to top through the sliding opening to the outside of the storage compartment. The water pipe inside the storage compartment is gradually straightened from the bottom to adapt to the length change of the extension mechanism, thereby ensuring that the water spray end of the water pipe is closer to the fire source when the position of the drone body remains unchanged, achieving a better fire extinguishing effect. In addition, it can also reduce space occupation when not in use and make it more convenient to store. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the lower structure of the unmanned aerial vehicle of the present invention;

[0026] Figure 4 This is a cross-sectional view of the storage compartment of the present invention;

[0027] Figure 5 This is a detailed structural diagram of the bending assembly and movable bracket of the present invention;

[0028] Figure 6 This is a detailed structural diagram of the adjustment mechanism of the present invention;

[0029] Figure 7 This is a schematic diagram of the structural position when the nozzle is replaced according to the present invention;

[0030] Figure 8 This is a schematic diagram of the structural position after the nozzle is replaced in this invention;

[0031] Figure 9 This is a structural assembly diagram of the connecting circular plate, movable ring, and first positioning arc plate of the present invention.

[0032] In the diagram: 100, Unmanned aerial vehicle (UAV) body; 200, Water pipe; 300, Storage mechanism; 310, Storage compartment; 320, Movable support; 321, Movable seat; 322, Movable rod; 330, Bending assembly; 331, Sliding block; 332, Sliding seat; 333, Rolling block; 334, Elastic element; 340, Guide tube; 350, Sliding end; 400, Extension mechanism; 410, First positioning plate; 420, First carriage; 430, Second carriage; 440, Third carriage; 450, Straight pipe; 500, Pushing mechanism; 510. Electric telescopic rod; 520, connecting frame; 600, drive mechanism; 610, connecting seat; 620, drive motor; 630, first gear; 700, adjusting mechanism; 710, second positioning plate; 720, third positioning plate; 730, connecting plate; 740, limit ring; 750, connecting circular plate; 760, movable ring; 770, first positioning arc plate; 780, electric cylinder; 701, first magnetic block; 702, second magnetic block; 800, rotating mechanism; 810, second gear; 820, second positioning arc plate; 900, nozzle. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 9 As shown, the present invention provides a spraying assembly for a fire-fighting drone, including a drone body 100 and a water pipe 200 connected inside the drone body 100, and further comprising:

[0035] Storage mechanism 300 is located at the bottom of the unmanned aerial vehicle body 100 and is used to store and fold part of the water pipe 200.

[0036] An extension mechanism 400 is located at the bottom of the storage mechanism 300 and is used to change the distance between the water pipe 200 nozzle and the unmanned aerial vehicle body 100.

[0037] A drive mechanism 500 is mounted on an extension mechanism 400 and is used to change the length of the extension mechanism 400.

[0038] The drive mechanism 600 and the rotation mechanism 800 are provided. The drive mechanism 600 is located at the end of the extension mechanism 400, and the rotation mechanism 800 is located at the end of the extension mechanism 400. The drive mechanism 600 is used to drive the rotation mechanism 800 to rotate.

[0039] The adjustment mechanism 700 and the nozzle 900 are provided. The adjustment mechanism 700 is located at the end of the extension mechanism 400, and the nozzle 900 is located inside the adjustment mechanism 700. The adjustment mechanism 700 is used to connect different nozzles 900 with the extension mechanism 400.

[0040] The above solution is as follows: by pushing mechanism 500, the extension mechanism 400 can be extended, and at the same time, the water pipe 200 inside the receiving mechanism 300 is gradually straightened, so that the position of the end of the water pipe 200 that sprays water changes. With the position of the unmanned aerial vehicle body 100 unchanged, the water spray point is closer to the fire source, preventing the airflow generated by the fire source from affecting the stability of the unmanned aerial vehicle body 100. Furthermore, by adjusting mechanism 700, different nozzles 900 can be connected to the end of extension mechanism 400, and by rotating mechanism 800, the nozzles 900 are fixed to extension mechanism 400, thereby changing the shape of the water spray, which is convenient for extinguishing fire sources in different states.

[0041] like Figure 4 and Figure 5 As shown, the storage mechanism 300 includes a storage compartment 310, a movable support 320, a bending assembly 330, a guide tube 340, and a sliding opening 350. The storage compartment 310 is installed at the bottom of the unmanned aerial vehicle body 100. The movable support 320 is hinged to both sides of the storage compartment 310. The bending assembly 330 is staggered inside the storage compartment 310 and limits part of the water pipe 200 into an "S" shape. The guide tube 340 is installed at the bottom of the storage compartment 310. The sliding opening 350 is opened on the side of the storage compartment 310 and is used for the passage of the bending assembly 330. The movable support 320 includes a movable seat 321 and a movable rod 322. The movable rod 322 slides... The movable seat 321 is located inside the movable seat 321 and is hinged to the storage compartment 310. When the movable seat 321 is parallel to the storage compartment 310, it can close the sliding opening 350. The bending assembly 330 includes a sliding block 331, a sliding seat 332, a rolling block 333 and an elastic element 334. The sliding block 331 slides horizontally inside the storage compartment 310. A sliding seat 332 is installed on one side of the sliding block 331 and slides elastically inside the storage compartment 310 through the elastic element 334. One end of the sliding seat 332 is provided with an inclined surface. The rolling block 333 is rotatably connected to the middle of the sliding block 331. The surface of the rolling block 333 is in contact with the water pipe 200.

[0042] The above solution involves bending the water pipe 200 inside the storage compartment 310 into an "S" shape using the bending component 330. This ensures the water pipe 200 has a certain length without affecting the water flow. When the extension mechanism 400 extends, the water pipe 200 inside the storage compartment 310 gradually straightens from the bottom to adapt to the length change of the extension mechanism 400. This ensures that, with the drone body 100 remaining in the same position, the spray end of the water pipe 200 is closer to the fire source, resulting in a better fire extinguishing effect. The sliding block 331 and the sliding seat 332 slide horizontally inside the storage compartment 310, while the elastic element 334 provides elasticity to compress and limit the water pipe 200 using the rolling block 333, thus positioning the water pipe 200 within the storage compartment 310. The internal bending ensures that the storage compartment 310 can accommodate longer water pipes 200. When the pushing mechanism 500 pushes the extension mechanism 400 to extend, the movable bracket 320 starts to rotate at the hinge with the storage compartment 310. At this time, the water pipes 200 inside the storage compartment 310 are gradually straightened from the bottom and slide out of the storage compartment 310 from the bottom bending component 330 through the sliding opening 350. It is worth noting that the wider the sliding opening 350 is exposed as the movable bracket 320 is further away from the hinge, the more inclined the sliding seat 332 ends. Multiple sets of bending components 330 move out of the storage compartment 310 from bottom to top, ensuring that the shape of the water pipes 200 inside the storage compartment 310 is stable and the distribution is more orderly.

[0043] like Figure 4 As shown, the extension mechanism 400 includes a first positioning plate 410, a first slide 420, a second slide 430, a third slide 440, and a straight tube 450. The first positioning plate 410 is installed at the end of the guide tube 340. The first slide 420 is fixedly connected to the first positioning plate 410. The first slide 420, the second slide 430, and the third slide 440 are slidably connected to each other. The straight tube 450 is fixedly connected to the third slide 440. The pushing mechanism 500 includes an electric telescopic rod 510 and a connecting frame 520. The electric telescopic rod 510 is symmetrically installed at both ends of the first positioning plate 410. The movable end of the electric telescopic rod 510 is connected to the connecting frame 520 installed on the surface of the straight tube 450. The connecting frame 520 is hinged to the movable rod 322.

[0044] The above solution is adopted: the electric telescopic rod 510 drives the connecting frame 520 to move, and the connecting frame 520 drives the sleeve formed by the first slide 420, the second slide 430 and the third slide 440 to extend through the straight pipe 450. During fire extinguishing, the overall length change of the extension mechanism 400 can make the water spray point of the water pipe 200 closer to the fire source for convenient fire extinguishing. When not in use, it can also reduce space occupation and make it easier to store.

[0045] like Figures 6 to 9As shown, the drive mechanism 600 includes a connecting seat 610, a drive motor 620, and a first gear 630. The drive motor 620 is mounted on the surface of the straight tube 450 via the connecting seat 610, and the first gear 630 is mounted on the output shaft of the drive motor 620. The adjustment mechanism 700 includes a second positioning plate 710, a third positioning plate 720, a connecting plate 730, a limiting ring 740, a connecting circular plate 750, a movable ring 760, a first positioning arc plate 770, and an electric cylinder 780. The second positioning plate 710 and the third positioning plate 720 are both mounted on the surface of the straight tube 450. The connecting plate 730 is symmetrically hinged to both ends of the third positioning plate 720. The outer end of the limiting ring 740 is fixedly connected to the connecting plate 730, and the inner end is connected to the connecting circular plate 750 via a bearing. The plate 750 is rotatably connected, and the middle part of the connecting circular plate 750 is elastically slidably connected to the movable ring 760 through a spring. The first positioning arc plate 770 is fixedly installed in a ring on the side of the connecting circular plate 750. One end of the electric cylinder 780 is hinged to the second positioning plate 710 and the other end is hinged to the connecting plate 730. The nozzle 900 is installed in the middle of the movable ring 760. The rotating mechanism 800 includes a second gear 810 and a second positioning arc plate 820. The second gear 810 is rotatably connected to the surface of the straight pipe 450 through a bearing. The second positioning arc plate 820 is installed in a ring on the side of the second gear 810. When the nozzle 900 is mated to the straight pipe 450, the second gear 810 and the first positioning arc plate 770 are spaced apart and there is a gap between them.

[0046] Using the above solution: the electric cylinder 780 can drive the connecting plate 730 to rotate 90 degrees at the hinge point with the third positioning plate 720. At this time, the nozzle 900 located inside the movable ring 760 mates with the straight pipe 450. During the mate, as... Figure 7 As shown in the diagram, the first gear 630 is then driven to rotate by the drive motor 620, which in turn drives the second gear 810 to rotate. The second gear 810, through the second positioning arc plate 820, drives the first positioning arc plate 770 to rotate, thereby causing the connecting circular plate 750 to rotate. At this time, the movable ring 760 abuts against the straight pipe 450 under the action of the spring and is threadedly connected to the straight pipe 450 during rotation. There is a gap between the first positioning arc plate 770 and the second positioning arc plate 820, so that the first positioning arc plate 770 will not block the second positioning arc plate 820 during the rotation of the connecting plate 730, thus ensuring the rationality of the structure. In addition, the nozzles 900 located in the middle of the two movable rings 760 have different styles, including but not limited to atomizing nozzles and fan-shaped nozzles. Initially, when the water flow is directly sprayed out through the straight pipe 450 located at the end of the water pipe 200, it is a direct current nozzle.

[0047] like Figure 6 As shown, a first magnetic block 701 is installed on the limiting ring 740, and a second magnetic block 702 is installed on the connecting circular plate 750. The first magnetic block 701 and the second magnetic block 702 are attracted by magnetic force.

[0048] The above solution achieves stable position of nozzle 900 through magnetic attraction between first magnetic block 701 and second magnetic block 702. Before nozzle 900 is threaded onto the outside of straight pipe 450, magnetic force ensures that nozzle 900 will not rotate. Especially for fan-shaped nozzles, it ensures that the long side of the fan-shaped nozzle 900 is parallel to the ground after it is installed on straight pipe 450, thereby ensuring the reliability of fire extinguishing.

[0049] Working principle and usage process of this invention:

[0050] In use, the electric telescopic rod 510 is first driven to move the connecting frame 520, thereby causing the sleeve formed by the first slide 420, the second slide 430 and the third slide 440 to extend and the movable support 320 to rotate. At this time, the multiple sets of bending components 330 inside the storage compartment 310 move from bottom to top through the sliding port 350 to the outside of the storage compartment 310. The water pipe 200 inside the storage compartment 310 is gradually straightened from the bottom to adapt to the length change of the extension mechanism 400, thereby ensuring that the water spray end of the water pipe 200 is closer to the fire source when the position of the unmanned aerial vehicle body 100 remains unchanged, achieving a better fire extinguishing effect. It can also reduce space occupation when not in use and make it more convenient to store.

[0051] When different types of nozzles 900 are needed to handle different fire conditions, the electric cylinder 780 is activated to drive the connecting plate 730 to rotate 90 degrees at the hinge point with the third positioning plate 720. At this time, the nozzle 900 located inside the movable ring 760 connects with the straight pipe 450. Then, the drive motor 620 drives the first gear 630 to rotate, the first gear 630 drives the second gear 810 to rotate, and the second gear 810 drives the first positioning arc plate 770 to rotate through the second positioning arc plate 820, thereby causing the connecting circular plate 750 to rotate. At this time, the movable ring 760 abuts against the straight pipe 450 under the action of the spring and is threadedly connected to the straight pipe 450 during rotation to ensure sealing. At this time, the pattern of the water jet changes.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spraying assembly for a fire-fighting drone, comprising a drone body (100) and a water pipe (200) connected inside the drone body (100), characterized in that, Also includes: Storage mechanism (300), the storage mechanism (300) is disposed at the bottom of the unmanned body (100) and is used to store and fold part of the water pipe (200); An extension mechanism (400) is provided at the bottom of the storage mechanism (300) and is used to change the distance between the nozzle of the water pipe (200) and the unmanned aerial vehicle body (100); A pushing mechanism (500) is disposed on an extension mechanism (400) and is used to change the length of the extension mechanism (400); A driving mechanism (600) and a rotating mechanism (800) are provided, wherein the driving mechanism (600) is disposed at the end of the extension mechanism (400), and the rotating mechanism (800) is disposed at the end of the extension mechanism (400), and the driving mechanism (600) is used to drive the rotating mechanism (800) to rotate; An adjustment mechanism (700) and a nozzle (900) are provided. The adjustment mechanism (700) is located at the end of the extension mechanism (400), and the nozzle (900) is located inside the adjustment mechanism (700). The adjustment mechanism (700) is used to connect different nozzles (900) with the extension mechanism (400). The storage mechanism (300) includes a storage compartment (310), a movable support (320), a bending assembly (330), a guide tube (340), and a sliding opening (350). The storage compartment (310) is installed at the bottom of the unmanned aerial vehicle (100). The movable support (320) is hinged to both sides of the storage compartment (310). The bending assembly (330) is staggered inside the storage compartment (310) and limits part of the water pipe (200) into an "S" shape. The guide tube (340) is installed at the bottom of the storage compartment (310). The sliding opening (350) is opened on the side of the storage compartment (310) and is used for the passage of the bending assembly (330). The movable support (320) includes a movable seat (321) and a movable rod (322). The movable rod (322) slides inside the movable seat (321). The movable seat (321) is hinged to the storage compartment (310). When the movable seat (321) is parallel to the storage compartment (310), it can close the sliding opening (350).

2. The spraying assembly of the firefighting drone according to claim 1, characterized in that: The bending assembly (330) includes a sliding block (331), a sliding seat (332), a rolling block (333), and an elastic element (334). The sliding block (331) slides horizontally inside the storage compartment (310). A sliding seat (332) is installed on one side of the sliding block (331) and slides elastically inside the storage compartment (310) through the elastic element (334). One end of the sliding seat (332) is provided with an inclined surface. The rolling block (333) is rotatably connected to the middle part of the sliding block (331). The surface of the rolling block (333) is in contact with the water pipe (200).

3. The spraying assembly of the firefighting drone according to claim 1, characterized in that: The extension mechanism (400) includes a first positioning plate (410), a first slide (420), a second slide (430), a third slide (440), and a straight tube (450). The first positioning plate (410) is installed at the end of the guide tube (340). The first slide (420) is fixedly connected to the first positioning plate (410). The first slide (420), the second slide (430), and the third slide (440) are slidably connected to each other. The straight tube (450) is fixedly connected to the third slide (440).

4. The spraying assembly of the firefighting drone according to claim 3, characterized in that: The pushing mechanism (500) includes an electric telescopic rod (510) and a connecting frame (520). The electric telescopic rod (510) is symmetrically installed at both ends of the first positioning plate (410). The movable end of the electric telescopic rod (510) is connected to the connecting frame (520) installed on the surface of the straight tube (450). The connecting frame (520) is hinged to the movable rod (322).

5. The spraying assembly of the firefighting drone according to claim 3, characterized in that: The drive mechanism (600) includes a connecting seat (610), a drive motor (620) and a first gear (630). The drive motor (620) is mounted on the surface of the straight tube (450) through the connecting seat (610), and the first gear (630) is mounted on the output shaft of the drive motor (620).

6. The spraying assembly of the firefighting drone according to claim 3, characterized in that: The adjusting mechanism (700) includes a second positioning plate (710), a third positioning plate (720), a connecting plate (730), a limiting ring (740), a connecting circular plate (750), a movable ring (760), a first positioning arc plate (770), and an electric cylinder (780). The second positioning plate (710) and the third positioning plate (720) are both mounted on the surface of the straight pipe (450). The connecting plate (730) is symmetrically hinged to both ends of the third positioning plate (720). The limiting ring (740)... The outer end is fixedly connected to the connecting plate (730), and the inner end is rotatably connected to the connecting circular plate (750) through a bearing. The middle part of the connecting circular plate (750) is elastically slidably connected to the movable ring (760) through a spring. The first positioning arc plate (770) is fixedly installed on the side of the connecting circular plate (750) in a ring shape. One end of the electric cylinder (780) is hinged to the second positioning plate (710), and the other end is hinged to the connecting plate (730). The nozzle (900) is installed in the middle of the movable ring (760).

7. The spraying assembly of the firefighting drone according to claim 6, characterized in that: The rotating mechanism (800) includes a second gear (810) and a second positioning arc plate (820). The second gear (810) is rotatably connected to the surface of the straight tube (450) through a bearing, and the second positioning arc plate (820) is installed in a ring on the side of the second gear (810). When the nozzle (900) is connected to the straight pipe (450), the second gear (810) and the first positioning arc plate (770) are spaced apart and there is a gap between them.

8. The spraying assembly of the firefighting drone according to claim 6, characterized in that: A first magnetic block (701) is installed on the limiting ring (740), and a second magnetic block (702) is installed on the connecting circular plate (750). The first magnetic block (701) and the second magnetic block (702) are attracted by magnetic force.

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