An unmanned aerial vehicle for river network inspection

Abstract

This invention discloses a drone for river network inspection, relating to the field of river channel drone inspection technology. The floating device further includes a folding airbag, an inflation device, an air inlet, and a cylinder. The folding airbag is fixedly connected to the bottom of the shell, and the inflation device is fixedly connected to the top of the folding airbag. The inflation device is electrically connected to the spiral blade. The air inlet is located on the outer circumference of the inflation device. The cylinder is fixedly connected to the inner wall of the hollow shell. A gravity sensor is installed inside the hollow shell, and the gravity sensor is electrically connected to the cylinder. When the inflation device is activated, it inflates the folding airbag at the bottom, generating buoyancy after the device falls into the water, preventing the device from sinking to the bottom and being difficult to recover. During normal flight, the folding airbag is in a retracted state, avoiding excessive flight resistance due to the excessive size of the buoyancy device.

Description

Technical Field

[0001] This invention belongs to the field of river channel drone inspection technology, specifically relating to a drone used for river network inspection. Background Technology

[0002] Traditional river network inspections rely on manual foot patrols or boats, which are inefficient, time-consuming, and have poor accessibility in complex waterways. Drone technology, with its advantages of maneuverability, wide field of view, and rapid response, can be equipped with high-definition cameras and sensors to quickly cover large areas of the river network, effectively increasing inspection frequency and data accuracy.

[0003] Patent CN216546680U discloses a drone for river network inspection, belonging to the field of drone equipment. The drone includes a main body with a camera fixedly connected to its lower end. Two pairs of symmetrical support brackets are also fixedly connected to the lower end of the main body, located outside the camera. A fixed block is fixedly connected to the lower end of each support bracket, and a floating base is installed on the outer end of the fixed block. A movable groove is carved into the upper end of the floating base, slidingly connecting to the fixed block. A slot is carved into the inner wall of the movable groove. Two symmetrical locking blocks are fixedly connected to the outer end of the fixed block, matching the slots. This design allows the drone for river network inspection to have good buoyancy. When the drone's battery is low and it falls into the center of the river network, the drone uses an inflatable airbag to float on the water surface, reducing the risk of short circuits due to water contact and extending the drone's lifespan.

[0004] The aforementioned device also has the following problems: the floating base of the device is too bulky, which can easily generate large drag during normal flight, thus affecting the stability of the flight. Summary of the Invention

[0005] The purpose of this invention is to provide a drone for river network inspection, in order to solve the problem that the floating base is too bulky and easily generates great drag during normal flight, thus affecting the stability of flight.

[0006] To achieve the above objectives, the present invention provides a drone for river network inspection, comprising a hollow shell, a floating device provided on the outer wall of the hollow shell, a maintenance device provided at the bottom of the hollow shell, and an alarm device provided at the top of the hollow shell. The floating device includes a support plate, a shell, a spiral blade, and an air inlet. The support plate is fixedly connected to the outer wall of the hollow shell, the shell is fixedly connected to the outer wall of the support plate, the spiral blade is rotatably connected to the top of the shell, and the air inlet is located on the top outer wall of the shell.

[0007] In the above technical solution, the floating device further includes a folding airbag, an inflation device, an air inlet, and a cylinder. The folding airbag is fixedly connected to the bottom of the shell, and the inflation device is fixedly connected to the top of the folding airbag. The inflation device is connected to the motor controller that drives the spiral blade to rotate via an electrical signal and is used to receive the braking signal of the spiral blade. The air inlet is opened on the outer circumferential surface of the inflation device. The cylinder is fixedly connected to the inner wall of the hollow shell. The inner wall of the hollow shell is provided with a gravity sensing device, and the gravity sensing device is electrically connected to the cylinder.

[0008] In the above technical solution, the floating device further includes a C-frame, sliding blocks, a horizontal rod, sliding plates, and a buffer bladder. The C-frame is fixedly connected to the output end of the cylinder. The sliding blocks are slidably connected to the inner wall of the hollow shell. The horizontal rod is fixedly connected to the inner wall of the sliding blocks. Multiple sliding blocks are provided and symmetrically distributed on the left and right sides of the hollow shell. The sliding blocks are connected to the inner wall of the hollow shell by springs. The sliding plates are fixedly connected to the outer wall of the sliding blocks. Multiple sliding plates are provided and symmetrically distributed on both sides of the hollow shell. The bottom end of the C-frame has a latch. During normal flight, the latch is engaged with the middle of the horizontal rod to restrict the symmetrically distributed sliding blocks from sliding to both sides. The buffer bladder is fixedly connected to the inner wall of the sliding plates. The inflation device inflates the folded airbag at the bottom, creating buoyancy after the device falls into the water, preventing it from sinking to the bottom and becoming difficult to recover. The folded airbag is in a retracted state during normal flight, avoiding excessive drag caused by an oversized buoyancy device.

[0009] In the above technical solution, the maintenance device further includes a bottom closing ring, a horizontal plate, a fixed connecting plate, and a first spiral rod. The bottom closing ring is fixedly connected to the bottom of the folding airbag, the horizontal plate is fixedly connected to the outer wall of the bottom closing ring, the fixed connecting plate is fixedly connected to the outer wall of the shell, the first spiral rod is rotatably connected to the inner wall of the fixed connecting plate, the horizontal plate and the first spiral rod are movably connected, and the inner wall of the horizontal plate is provided with a movable key, which is located in the spiral groove on the circumferential surface of the first spiral rod.

[0010] In the above technical solution, the maintenance device further includes a second spiral rod, an inner movable plate, a sealing ring, and a horizontal frame. The second spiral rod is rotatably connected to the inner wall of the air inlet. The second spiral rod and the first spiral rod are connected by a pulley set for transmission. The inner movable plate is movably connected to the outer circumferential surface of the second spiral rod. The inner wall of the inner movable plate is provided with a movable key, which is located in the spiral groove on the circumferential surface of the second spiral rod. The sealing ring is fixedly connected to the outer wall of the inner movable plate. When the folded airbag is not inflated, the sealing ring is located below the air inlet. The air inlet is located on the movement trajectory of the sealing ring. The horizontal frame is fixedly connected to the bottom of the sliding plate.

[0011] In the above technical solution, the maintenance device further includes an elastic limiting frame, a vertical rod, and a buoyancy cylinder. The elastic limiting frame is fixedly connected to the inner wall of the horizontal frame, the vertical rod is fixedly connected to the bottom of the horizontal frame, and the buoyancy cylinder is fixedly connected to the bottom of the vertical rod. As the horizontal frame moves, it causes the vertical pole at the bottom to unfold. As the vertical pole moves to both sides, it causes the buoyancy cylinder at the bottom to move to both sides, thereby increasing the buoyancy in the middle of the device and preventing the device from capsizing and sinking due to excessive river waves during the floating process.

[0012] In the above technical solution, the alarm device further includes a connecting plate and a vertical slide. One end of the connecting plate is fixedly connected to the bottom of the buoyancy cylinder, and the other end is connected to the bottom of the hollow shell. When the buoyancy cylinder moves to both sides, the connecting plate is stretched out to cover and protect the imaging equipment at the bottom of the hollow shell. The vertical slide is fixedly connected to the top of the connecting plate, and the vertical slide is slidably connected to the outer wall of the hollow shell.

[0013] In the above technical solution, the alarm device further includes a horizontal slide and a pressing block. The horizontal slide is fixedly connected to the inner wall of the vertical slide, and the horizontal slide is slidably connected to the hollow shell. The pressing block is fixedly connected to the inner wall of the horizontal slide.

[0014] In the above technical solution, the alarm device further includes a warning light and a start button. The warning light is fixedly connected to the top of the hollow shell, and the start button is slidably connected to the inner wall of the warning light. The start button and the warning light are electrically connected. As the vertical slide moves, it drives the horizontal slide at the top to move as well. The horizontal slide moves the pressing block toward the start button, and the start button is then pressed, which sends an electrical signal to the warning light, causing the warning light to sound an alarm and illuminate, thus facilitating the subsequent retrieval and retrieval of the device by the recovery personnel.

[0015] The beneficial effects of this invention are: 1. In this invention, the spiral blade, the inflation device, and the folding airbag work together. When the device falls, the spiral blade stops rotating. Then, the inflation device receives the stop signal from the spiral blade and starts to inflate the folding airbag at the bottom. This generates buoyancy after the device falls into the water, preventing the device from sinking to the bottom and being difficult to recover. The folding airbag is in a retracted state during normal flight, avoiding excessive flight resistance caused by the buoyancy device being too large.

[0016] 2. In this invention, with the cooperation of the first spiral rod, the folding airbag, and the sealing ring, the first spiral rod rotates and drives the second spiral rod to rotate through the pulley set. During the rotation of the second spiral rod, the inner movable plate moves upward through the spiral groove on the circumferential surface. The upward movement of the inner movable plate drives the sealing ring to move upward. When the folding airbag is fully inflated, the sealing ring also seals the air inlet, preventing the device from floating on the river surface for too long. Otherwise, the gas inside the folding airbag will leak out through the air inlet over time, causing the buoyancy of the device to decrease and causing it to sink.

[0017] 3. In this invention, with the cooperation of the sliding plate, the vertical slide, and the start button, the sliding plate moves the vertical slide during its unfolding and moving process. The vertical slide moves the top horizontal slide during its movement, and the horizontal slide moves the pressing block towards the start button. Subsequently, the start button is pressed and releases an electrical signal to the warning light, causing the warning light to sound an alarm and light up, thereby facilitating the subsequent retrieval and retrieval of the device by the recovery personnel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall device structure of the present invention; Figure 2 This is a schematic diagram of the air inlet structure of the present invention; Figure 3 This is the invention Figure 2 Enlarged view of a portion of the structure at point A; Figure 4 This is a schematic diagram of the maintenance device structure of the present invention; Figure 5 This is a schematic diagram of the buoyancy cylinder structure of the present invention; Figure 6 This is a schematic diagram of the extended sheet structure of the present invention; Figure 7 This is the invention Figure 6 A magnified view of the structure at point B in the middle.

[0019] The markings in the diagram are as follows: 1. Hollow shell; 2. Floating device; 201. Support plate; 202. Sheet shell; 203. Spiral blade; 204. Air inlet; 205. Folding airbag; 206. Inflation device; 207. Air inlet; 208. Cylinder; 209. C-frame; 210. Sliding block; 211. Horizontal bar; 212. Sliding plate; 213. Buffer bag; 3. Maintenance device; 301. Bottom closing ring; 302 303. Horizontal plate; 304. Fixed connecting plate; 305. Helical rod one; 306. Helical rod two; 307. Inner movable plate; 308. Sealing ring; 309. Horizontal square frame; 310. Elastic limit frame; 310. Vertical rod; 311. Buoyancy cylinder; 4. Alarm device; 401. Extending connecting plate; 402. Vertical slide frame; 403. Horizontal slide frame; 404. Compression block; 405. Warning light; 406. Start button. Detailed Implementation

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0021] like Figures 1-7 As shown, one embodiment of the present invention provides: a drone for river network inspection, including a hollow shell 1, a floating device 2 provided on the outer wall of the hollow shell 1, a maintenance device 3 provided on the bottom of the hollow shell 1, and an alarm device 4 provided on the top of the hollow shell 1. The floating device 2 includes a support plate 201, a shell 202, a spiral blade 203, and an air inlet 204. The support plate 201 is fixedly connected to the outer wall of the hollow shell 1, the shell 202 is fixedly connected to the outer wall of the support plate 201, the spiral blade 203 is rotatably connected to the top of the shell 202, and the air inlet 204 is opened on the top outer wall of the shell 202.

[0022] The floating device 2 also includes a folding airbag 205, an inflation device 206, an air inlet 207, and a cylinder 208. The folding airbag 205 is fixedly connected to the bottom of the shell 202, and the inflation device 206 is fixedly connected to the top of the folding airbag 205. The inflation device 206 is connected to the motor controller that drives the spiral blade 203 to rotate via an electrical signal, and is used to receive the stop signal of the spiral blade 203. The air inlet 207 is opened on the outer circumferential surface of the inflation device 206. The cylinder 208 is fixedly connected to the inner wall of the hollow shell 1. The inner wall of the hollow shell 1 is provided with a gravity sensor, and the gravity sensor is electrically connected to the cylinder 208.

[0023] The floating device 2 also includes a C-frame 209, a sliding block 210, a horizontal rod 211, a sliding plate 212, and a buffer bladder 213. The C-frame 209 is fixedly connected to the output end of the cylinder 208. The sliding block 210 is slidably connected to the inner wall of the hollow shell 1. The horizontal rod 211 is fixedly connected to the inner wall of the sliding block 210. Multiple sliding blocks 210 are provided and symmetrically distributed on the left and right sides of the hollow shell 1. The sliding block 210 and the inner wall of the hollow shell 1 are connected by a spring. The sliding plate 212 is fixedly connected to the outer wall of the sliding block 210. Multiple sliding plates 212 are provided and symmetrically distributed on both sides of the hollow shell 1. The bottom end of the C-frame 209 has a latch, which is engaged with the middle of the horizontal rod 211 during normal flight. The buffer bladder 213 is fixedly connected to the inner wall of the sliding plate 212. Simultaneously, when the device falls, the spiral blade 203 stops rotating. Subsequently, the inflation device 206 receives the stop signal from the spiral blade 203 and starts to inflate the folded airbag 205 at the bottom. This generates buoyancy after the device falls into the water, preventing it from sinking to the bottom and being difficult to recover. The folded airbag 205 is in a retracted state during normal flight, avoiding excessive flight resistance due to the excessive size of the buoyancy device.

[0024] The maintenance device 3 includes a bottom closing ring 301, a horizontal plate 302, a fixed connecting plate 303, and a spiral rod 304. The bottom closing ring 301 is fixedly connected to the bottom of the folding airbag 205. The horizontal plate 302 is fixedly connected to the outer wall of the bottom closing ring 301. The fixed connecting plate 303 is fixedly connected to the outer wall of the shell 202. The spiral rod 304 is rotatably connected to the inner wall of the fixed connecting plate 303. The horizontal plate 302 and the spiral rod 304 are movably connected. The inner wall of the horizontal plate 302 is provided with a movable key, and the movable key is located in the spiral groove on the circumferential surface of the spiral rod 304.

[0025] The maintenance device 3 also includes a second spiral rod 305, an inner movable piece 306, a sealing ring 307, and a horizontal frame 308. The second spiral rod 305 is rotatably connected to the inner wall of the air inlet 204. The second spiral rod 305 and the first spiral rod 304 are connected by a pulley set for transmission. The inner movable piece 306 is movably connected to the outer circumferential surface of the second spiral rod 305. The inner wall of the inner movable piece 306 is provided with a movable key, which is located in the spiral groove on the circumferential surface of the second spiral rod 305. The sealing ring 307 is fixedly connected to the outer wall of the inner movable piece 306. When the folded airbag 205 is not inflated, the sealing ring 307 is located below the air inlet 207. The air inlet 207 is located on the movement trajectory of the sealing ring 307. The horizontal frame 308 is fixedly connected to the bottom of the sliding piece 212.

[0026] The maintenance device 3 also includes an elastic limiting frame 309, a vertical rod 310, and a buoyancy cylinder 311. The elastic limiting frame 309 is fixedly connected to the inner wall of the horizontal frame 308, the vertical rod 310 is fixedly connected to the bottom of the horizontal frame 308, and the buoyancy cylinder 311 is fixedly connected to the bottom of the vertical rod 310. During the rotation of the first screw rod 304, the second screw rod 305 is driven to rotate through the pulley assembly. During the rotation of the second screw rod 305, the inner movable plate 306 is driven to move upward through the spiral groove on the circumferential surface. The upward movement of the inner movable plate 306 drives the sealing ring 307 to move upward. When the folding airbag 205 is fully inflated, the sealing ring 307 also seals the air inlet 207 to prevent the device from floating on the river surface for too long. Otherwise, the gas inside the folding airbag 205 will leak out through the air inlet 207 over time, causing the buoyancy of the device to decrease and causing it to sink.

[0027] Working principle: When the device encounters an unexpected situation during aerial survey of the river environment, causing it to fall rapidly from a high altitude, the gravity sensor detects a state of weightlessness or abnormal acceleration changes. The gravity sensor sends an electrical signal to cylinder 208. Upon receiving the signal, cylinder 208 retracts and moves the C-frame 209 downwards. During this downward movement, the horizontal rod 211 loses its restraint from the C-frame 209's latch. Subsequently, the spring between the sliding block 210 and the inner wall of the hollow shell 1 retracts, causing the sliding block 210 to move to both sides. This movement of the sliding block 210 to both sides drives the sliding plate. 212 unfolds to both ends, and the unfolding of the sliding plate 212 drives the buffer bag 213 to unfold, which cushions the fall of the device and prevents the device from falling too fast, causing damage to the internal parts of the device due to excessive impact after landing. At the same time, when the device falls, the spiral blade 203 stops rotating. After receiving the stop signal from the spiral blade 203, the inflation device 206 starts to inflate the folded airbag 205 at the bottom, so that the device generates buoyancy after falling into the water, preventing the device from sinking to the bottom and being difficult to recover. The folded airbag 205 is in a retracted state during normal flight to avoid excessive flight drag caused by the buoyancy device being too large.

[0028] During inflation, the folding airbag 205 causes the bottom closing ring 301 to move downwards. This downward movement of the bottom closing ring 301 causes the transverse plate 302 to move downwards. The downward movement of the transverse plate 302, through the non-self-locking spiral groove on its circumferential surface, causes the spiral rod 304 to rotate under the constraint of the fixed connecting plate 303. During rotation, the spiral rod 304, through the pulley assembly, causes the spiral rod 305 to rotate. During rotation, the spiral rod 305, through the spiral groove on its circumferential surface, causes the inner movable piece 306 to move upwards. The upward movement of the inner movable piece 306 causes the sealing ring 307 to move upwards. When the folding airbag 205 is fully inflated, the sealing ring 307 also seals the air inlet 207, thereby controlling the inflation device 206. The sealing ensures that the device will not leak air, preventing it from floating on the river surface for too long. As time passes, the gas inside the folded airbag 205 will leak out through the air inlet 207, causing the device's buoyancy to decrease and causing it to sink. At the same time, as the sliding plate 212 unfolds, it moves the bottom horizontal frame 308 to both sides. During the movement of the horizontal frame 308, it causes the elastic limiting frame 309 to unfold, providing limiting support for the horizontal frame 308 and the vertical rod 310. Subsequently, as the horizontal frame 308 moves, it also causes the bottom vertical rod 310 to unfold. As the vertical rod 310 moves to both sides, it causes the bottom buoyancy cylinder 311 to move to both sides, thereby increasing the buoyancy in the middle of the device and preventing the device from capsizing and sinking due to excessive river waves during the floating process.

[0029] like Figures 1-7 As shown, the second embodiment of the present invention provides: the alarm device 4 includes a connecting piece 401 and a vertical slide 402. One end of the connecting piece 401 is fixedly connected to the bottom of the buoyancy cylinder 311, and the other end is connected to the bottom of the hollow shell 1. The vertical slide 402 is fixedly connected to the top of the sliding piece 212, and the vertical slide 402 is slidably connected to the outer wall of the hollow shell 1.

[0030] The alarm device 4 also includes a horizontal slide 403 and a pressing block 404. The horizontal slide 403 is fixedly connected to the inner wall of the vertical slide 402. The horizontal slide 403 is slidably connected to the hollow shell 1. The pressing block 404 is fixedly connected to the inner wall of the horizontal slide 403.

[0031] The alarm device 4 also includes a warning light 405 and a start button 406. The warning light 405 is fixedly connected to the top of the hollow shell 1, and the start button 406 is slidably connected to the inner wall of the warning light 405. The start button 406 and the warning light 405 are electrically connected. Working principle: During the unfolding process, the buoyancy cylinder 311 causes the connecting plate 401 to be stretched and unfolded. After unfolding, the connecting plate 401 protects and isolates the image collection equipment assembled at the bottom of the hollow shell 1, reducing the contact between the assembled equipment and water, and preventing the equipment from being damaged by excessive water. During the unfolding and moving process, the sliding plate 212 causes the vertical slide 402 to move. During the movement of the vertical slide 402, the horizontal slide 403 at the top moves. During the movement of the horizontal slide 403, the squeezing block 404 moves towards the start button 406. Subsequently, the start button 406 is squeezed and releases an electrical signal to the warning light 405, causing the warning light 405 to sound an alarm and light up, thereby facilitating the subsequent retrieval and retrieval of the device by the recovery personnel.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A drone for river network inspection, characterized in that, Includes a hollow shell (1), the outer wall of the hollow shell (1) is provided with a floating device (2), the bottom of the hollow shell (1) is provided with a maintenance device (3), and the top of the hollow shell (1) is provided with an alarm device (4). The floating device (2) includes a support plate (201), a shell (202), a spiral blade (203), and an air inlet (204). The support plate (201) is fixedly connected to the outer wall of the hollow shell (1), the shell (202) is fixedly connected to the outer wall of the support plate (201), the spiral blade (203) is rotatably connected to the top of the shell (202), and the air inlet (204) is opened on the top outer wall of the shell (202).

2. The UAV for river network inspection according to claim 1, characterized in that, The floating device (2) also includes a folding airbag (205), an inflation device (206), an air inlet (207), and a cylinder (208). The folding airbag (205) is fixedly connected to the bottom of the shell (202), and the inflation device (206) is fixedly connected to the top of the folding airbag (205). The inflation device (206) is connected to the motor controller that drives the spiral blade (203) to rotate via an electrical signal, and is used to receive the stop signal of the spiral blade (203). The air inlet (207) is opened on the outer circumferential surface of the inflation device (206) for the inflation device (206) to take in air. The cylinder (208) is fixedly connected to the inner wall of the hollow shell (1). The inner wall of the hollow shell (1) is provided with a gravity sensing device, and the gravity sensing device is electrically connected to the cylinder (208).

3. The UAV for river network inspection according to claim 2, characterized in that, The floating device (2) also includes a C-frame (209), a sliding block (210), a horizontal rod (211), a sliding plate (212), and a buffer bladder (213). The C-frame (209) is fixedly connected to the output end of the cylinder (208). The sliding block (210) is slidably connected to the inner wall of the hollow shell (1). The horizontal rod (211) is fixedly connected to the inner wall of the sliding block (210). Multiple sliding blocks (210) are provided and symmetrically distributed on the left and right sides of the hollow shell (1). (210) is connected to the inner wall of the hollow shell (1) by a spring. The sliding plate (212) is fixedly connected to the outer wall of the sliding block (210). Multiple sliding plates (212) are provided and symmetrically distributed on both sides of the hollow shell (1). The bottom end of the C-shaped frame (209) has a latch. During normal flight, the latch is locked in the middle of the horizontal bar (211) to restrict the symmetrically distributed sliding blocks (210) from sliding to both sides. The buffer bag (213) is fixedly connected to the inner wall of the sliding plate (212).

4. The UAV for river network inspection according to claim 3, characterized in that, The maintenance device (3) includes a bottom closing ring (301), a horizontal plate (302), a fixed connecting plate (303), and a first spiral rod (304). The bottom closing ring (301) is fixedly connected to the bottom of the folding airbag (205). The horizontal plate (302) is fixedly connected to the outer wall of the bottom closing ring (301). The fixed connecting plate (303) is fixedly connected to the outer wall of the shell (202). The first spiral rod (304) is rotatably connected to the inner wall of the fixed connecting plate (303). The horizontal plate (302) and the first spiral rod (304) are movably connected. The inner wall of the horizontal plate (302) is provided with a movable key, and the movable key is located in the spiral groove on the circumferential surface of the first spiral rod (304).

5. The UAV for river network inspection according to claim 4, characterized in that, The maintenance device (3) further includes a second spiral rod (305), an inner movable plate (306), a sealing ring (307), and a horizontal frame (308). The second spiral rod (305) is rotatably connected to the inner wall of the air inlet (204). The second spiral rod (305) and the first spiral rod (304) are connected by a pulley system. The inner movable plate (306) is movably connected to the outer circumferential surface of the second spiral rod (305). The inner wall is provided with a movable key, and the movable key is located in the spiral groove on the circumferential surface of the spiral rod (305). The sealing ring (307) is fixedly connected to the outer wall of the inner movable piece (306). When the folded airbag (205) is not inflated, the sealing ring (307) is located below the air inlet (207). The air inlet (207) is located on the movement trajectory of the sealing ring (307). The horizontal frame (308) is fixedly connected to the bottom of the sliding piece (212).

6. A drone for river network inspection according to claim 5, characterized in that, The maintenance device (3) also includes an elastic limiting frame (309), a vertical rod (310), and a buoyancy cylinder (311). The elastic limiting frame (309) is fixedly connected to the inner wall of the horizontal frame (308), the vertical rod (310) is fixedly connected to the bottom of the horizontal frame (308), and the buoyancy cylinder (311) is fixedly connected to the bottom of the vertical rod (310).

7. A drone for river network inspection according to claim 6, characterized in that, The alarm device (4) includes a connecting plate (401) and a vertical slide (402). One end of the connecting plate (401) is fixedly connected to the bottom of the buoyancy cylinder (311), and the other end is connected to the bottom of the hollow shell (1). When the buoyancy cylinder (311) moves to both sides, the connecting plate (401) is stretched out to cover and protect the imaging equipment at the bottom of the hollow shell (1). The vertical slide (402) is fixedly connected to the top of the sliding plate (212), and the vertical slide (402) is slidably connected to the outer wall of the hollow shell (1).

8. The UAV for river network inspection according to claim 7, characterized in that, The alarm device (4) also includes a horizontal slide (403) and a pressing block (404). The horizontal slide (403) is fixedly connected to the inner wall of the vertical slide (402). The horizontal slide (403) is slidably connected to the hollow shell (1). The pressing block (404) is fixedly connected to the inner wall of the horizontal slide (403).

9. A drone for river network inspection according to claim 8, characterized in that, The alarm device (4) also includes a warning light (405) and a start button (406). The warning light (405) is fixedly connected to the top of the hollow shell (1), and the start button (406) is slidably connected to the inner wall of the warning light (405). The start button (406) and the warning light (405) are electrically connected.

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