A surveying and mapping unmanned aerial vehicle hovering balancing device

Abstract

This invention relates to the field of unmanned aerial vehicle (UAV) technology and discloses a balancing device for hovering a surveying UAV. The device includes a surveying UAV body, a support base fixed to the bottom of the UAV body, several rotatable circular plates at the bottom of the support base, and support legs eccentrically positioned on each circular plate. A hollow shaft is fixed to each circular plate, with its lower end fixedly connected to the circular plate. A circular storage slot is formed inside each support leg. A mounting base is fixed to the support base, and a flexible water storage bag is fixed to the mounting base. Water outlet pipes are provided on both sides of the flexible water storage bag. This application utilizes the support legs as counterweights to adjust the center of gravity of the surveying UAV body, thereby maintaining stable flight and improving surveying accuracy. It also achieves integrated design, reduces the need for additional counterweights, and improves the UAV's endurance.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) technology, specifically to a hovering balancing device for a surveying UAV. Background Technology

[0002] Surveying drones play a crucial role in modern surveying. Their core function is to rapidly acquire high-resolution images and 3D spatial data of the Earth's surface by flying at low altitudes and carrying high-precision sensors such as cameras, LiDAR, and GPS. This data can be used to generate orthophoto maps, digital elevation models, and 3D point cloud models, enabling efficient completion of tasks such as land use surveys, cadastral map updates, and land title confirmation. They are particularly suitable for areas with complex terrain or those inaccessible by human personnel. Compared to traditional surveying methods, drone surveying is dozens of times more efficient and achieves centimeter-level accuracy. In the early stages of projects such as power lines, highways, railways, and oil and gas pipelines, drones can quickly acquire aerial data of linear areas, providing a scientific basis for route selection and supporting subsequent construction monitoring. The hovering and balancing devices on surveying drones are mainly used to improve their stability when hovering in the air, especially in environments with wind interference, load shifts, or complex airflow. Most modern drones rely on gyroscopes and sensor fusion algorithms to achieve electronically stable hovering. Mechanical balancing devices are mostly used as auxiliary or enhanced designs for specific scenarios. They can work with the flight control system to automatically adjust the center of gravity and prevent the drone from shaking due to external disturbances during the surveying process.

[0003] In existing technical solutions, mechanical balancing devices mainly adjust the center of gravity by setting movable counterweights inside the fuselage of the drone. However, this device has the following problems during use: 1. The presence of counterweights increases the load on the drone. Secondly, the adjustment mechanism used to adjust the center of gravity of the counterweights requires a series of mechanisms such as lead screws and motors, which are quite heavy and significantly reduce the flight time of the surveying drone, affecting surveying efficiency. 2. The removal and installation of the counterweights both require opening the drone, making the addition and removal of counterweights less flexible. Summary of the Invention

[0004] This invention provides a balancing device for hovering a surveying drone, which adjusts the rotational position of the support legs to adjust the center of gravity of the drone body, thereby maintaining stable flight and improving surveying accuracy. The use of the support legs as counterweights also achieves integrated design, reducing the need for additional counterweights and lightening their weight. This improves the drone's endurance and extends surveying time. It addresses the problems mentioned in the background art, such as the increased weight of the drone due to the presence of counterweights, the need for adjustment mechanisms using lead screws, motors, and other components resulting in significant weight and reduced drone endurance, impacting surveying efficiency, and the inflexibility of adding or removing counterweights requiring the drone to be opened for installation and removal.

[0005] The present invention provides the following technical solution: a balancing device for hovering a surveying drone, comprising a surveying drone body, a support base fixed below the surveying drone body, a plurality of rotatable circular plates arranged at the bottom of the support base, and support legs eccentrically arranged on the circular plates, a hollow shaft fixed on the circular plates, the lower end of the hollow shaft being fixedly connected to the circular plates, and a circular storage groove opened inside the support legs; A mounting base is fixed on the support base, and a flexible water storage bag is fixed on the mounting base. Water outlet pipes are provided on both sides of the flexible water storage bag. Movable extrusion plates are provided on both sides of the mounting base, and a drain pipe is provided on one side of the circular plate.

[0006] As an optional solution for the hovering balancing device for the surveying UAV described in this invention, a first gear is fixed on the hollow shaft, a servo motor is fixed on the support base, and a second gear is mounted on the motor shaft of the servo motor, with the second gear meshing with the first gear.

[0007] As an optional solution for the hovering balancing device for the surveying UAV described in this invention, the circular plate is provided with a flow groove, which is connected to the storage groove and the hollow shaft respectively, and a rotary joint is installed on the hollow shaft, with a water injection pipe fixed at one end of the rotary joint.

[0008] As an optional solution for the hovering balancing device for the surveying UAV described in this invention, wherein: a T-shaped water distribution joint is connected to each of the two water outlet pipes, and the water inlet pipe is connected to the T-shaped water distribution joint via a pipe.

[0009] As an optional solution of the hovering balancing device for the surveying UAV described in this invention, a piston plate is provided in the storage slot, the piston plate is slidably connected to the support leg, and a first spring is provided in the storage slot, one end of the first spring is fixedly connected to the piston plate, and the other end of the first spring is fixedly connected to the support leg.

[0010] As an optional solution for the hovering balancing device for the surveying UAV described in this invention, the mounting base has two miniature electric push rods fixedly mounted on it. The piston rods of the two miniature electric push rods are respectively fixedly connected to the two extrusion plates, and a guide block is fixed to one end of each of the two extrusion plates. A guide rod is fixedly mounted on the mounting base, and the guide block is slidably connected to the guide rod.

[0011] As an optional embodiment of the hovering balancing device for the surveying UAV described in this invention, the drain pipe is connected to the flow channel, and a sealing plug is provided inside the drain pipe. A sealing cap is fixed to one end of the drain pipe, the sealing plug is located inside the flow channel, and the sealing plug is inserted into one end of the drain pipe.

[0012] As an optional solution of the hovering balancing device for the surveying UAV described in this invention, the sealing plug is fixed with an abutting slide rod, the abutting slide rod is slidably connected to the sealing cover, and a second spring is provided on the side of the abutting slide rod away from the sealing plug. One end of the second spring is connected to the sealing cover, and the other end is connected to the abutting slide rod. A drainage component for adjusting the moving position of the sealing plug is provided on the support base.

[0013] As an optional solution of the hovering balancing device for the surveying UAV described in this invention, the drainage component includes a first abutting wedge, which is slidably connected to the support base, and a strip plate is fixed on the first abutting wedge. A third spring is fixed on the strip plate, one end of which is fixedly connected to the support base. A second abutting wedge is fixed on the strip plate, and an abutting rod is fixed on the extrusion plate.

[0014] As an optional solution for the hovering balancing device for the surveying UAV described in this invention, the drainage component includes an arc-shaped block, which is fixed to the lower surface of the support base, and the arc-shaped block is provided with an abutting groove.

[0015] The present invention has the following beneficial effects: 1. In this hovering balancing device for a surveying drone, several rotatable circular plates are set at the bottom of the support base to drive the eccentrically positioned support legs to rotate. This allows the center of gravity of the surveying drone to be adjusted during hovering and surveying by changing the rotation position of the support legs, thereby maintaining stable flight and improving surveying accuracy. The use of support legs as counterweights does not affect the drone's take-off and landing or provides structural support when stationary on the ground. It also achieves the purpose of integrated design, reducing the need for additional counterweights, lowering the drone's load, improving the drone's endurance, and extending the surveying time. When the surveying drone hovers during the surveying process, the motor shaft of the servo motor on the support base drives the second gear to drive the first gear to rotate, causing the hollow shaft to drive the eccentric support leg on the circular plate to deflect. This achieves the purpose of adjusting the center of gravity of the surveying drone body, so that the surveying drone body can maintain a stable state when hovering, and improve the accuracy of surveying data acquisition.

[0016] 2. In this hovering balancing device for a surveying UAV, a flexible water storage bag is fixed at the center of the UAV body via a mounting base on the support base. Movable compression plates on both sides of the mounting base compress the flexible water storage bag. Through the cooperation of storage slots, flow channels, hollow shafts, rotary joints, and water injection pipes on the support legs, water from the flexible water storage bag can be injected into the support legs, increasing the counterweight of the support legs. A piston plate elastically connected within the storage slot slides downwards to increase storage space when weight is added. When weight reduction is needed, the piston plate moves upwards under elastic force, automatically squeezing water from the support legs into the flexible water storage bag, thus reducing the counterweight of the support legs. This further improves the flexibility of weight adjustment for the surveying UAV body in complex airflow environments, ensuring the stability of the UAV body during hovering surveying. When the main body of the surveying drone flies in a complex airflow environment, two miniature electric push rods drive the extrusion plates to move, so as to squeeze the water in the flexible water storage bag, causing the water in the flexible water storage bag to flow into the support leg. The piston plate is affected by the water pressure and retracts into the bottom of the storage tank, so as to flexibly adjust the counterweight of the support leg. This allows the main body of the surveying drone to remain stable when hovering in complex environments, thereby improving the accuracy of surveying.

[0017] 3. In the hovering balancing device of this surveying UAV, the drain pipe is connected to the flow groove on the circular plate. The sealing plug can block the drain pipe. When the support leg adds counterweight, it can prevent water from flowing out of the drain pipe. When the main body of the surveying UAV needs to adjust the counterweight during flight, the drainage component can drive the sealing plug to open automatically, so that the water in the flexible water storage bag can be automatically discharged from the drain pipe. This makes it easy to reduce the counterweight of the main body of the surveying UAV during flight and can improve its endurance. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a cross-sectional view of the structure of the present invention.

[0020] Figure 3 This is one of the schematic diagrams of the support base structure of the present invention.

[0021] Figure 4 This is a cross-sectional view of the support base structure of the present invention.

[0022] Figure 5 This is the second schematic diagram of the support base structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the circular plate and supporting leg structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the arc-shaped block structure of the present invention.

[0025] Figure 8 for Figure 4 Enlarged view of a portion of point A in the middle.

[0026] In the diagram: 1. Main body of the surveying UAV; 2. Mounting base; 3. Support base; 4. Circular plate; 5. Support leg; 6. Storage slot; 7. Hollow shaft; 8. Flexible water storage bag; 9. Water outlet pipe; 10. Extrusion plate; 11. First gear; 12. Servo motor; 13. Second gear; 14. Flow channel; 15. Rotary joint; 16. Water injection pipe; 17. T-shaped water distribution joint; 18. Piston plate; 19. First spring; 20. Miniature electric push rod; 21. Guide block; 22. Guide rod; 23. Drain pipe; 24. Abutment slide bar; 25. Sealing plug; 26. Sealing cap; 27. Second spring; 28. First abutment wedge; 29. ​​Strip plate; 30. Third spring; 31. Second abutment wedge; 32. Abutment rod; 33. Arc block; 34. Abutment inclined groove. Detailed Implementation

[0027] 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.

[0028] Example 1, please refer to Figures 1 to 8 A hovering balancing device for a surveying drone includes a surveying drone body 1, a support base 3 fixed below the surveying drone body 1, a plurality of rotatable circular plates 4 provided at the bottom of the support base 3, and support legs 5 eccentrically provided on the circular plates 4, a hollow shaft 7 fixed on the circular plates 4, the lower end of the hollow shaft 7 being fixedly connected to the circular plates 4, and a circular storage slot 6 opened inside the support leg 5; A mounting base 2 is fixed on the support base 3, and a flexible water storage bag 8 is fixed on the mounting base 2. Water outlet pipes 9 are provided on both sides of the flexible water storage bag 8. Movable extrusion plates 10 are provided on both sides of the mounting base 2, and a drain pipe 23 is provided on one side of the circular plate 4.

[0029] A first gear 11 is fixed on the hollow shaft 7, a servo motor 12 is fixed on the support base 3, and a second gear 13 is installed on the motor shaft of the servo motor 12. The second gear 13 meshes with the first gear 11.

[0030] refer to Figures 1 to 6 The main body of the surveying drone 1 carries high-precision sensors to collect data on the surveying area during low-altitude flight. When the main body of the surveying drone 1 collects detailed data on a certain area in the air, it is necessary to hover stably above the target point to ensure the surveying accuracy of the main body of the surveying drone 1. When hovering, the center of gravity of the main body of the surveying drone 1 needs to be adjusted. When the servo motors 12 at the corners of the support base 3 under the main body 1 of the surveying drone are running, the motor shafts of the servo motors 12 can drive the hollow shaft 7 to rotate on the support base 3, causing the circular piece 4 at the lower end of the hollow shaft 7 to rotate, so that the support leg 5 eccentrically set on the circular piece 4 can deflect, thereby achieving the purpose of adjusting the center of gravity of the main body 1 of the surveying drone. When the main body 1 of the surveying drone is hovering and surveying, it can reduce the influence of airflow, so as to maintain a stable state and improve the accuracy of surveying data acquisition. Among them, the support leg 5 is used as a counterweight to adjust the center of gravity of the main body 1 of the surveying drone. On the one hand, it will not affect the take-off and landing of the drone and provide structural support when the drone is stationary on the ground, thus achieving the purpose of integrated setting. On the other hand, it reduces the increase of counterweight, reduces the load of the drone, improves the endurance of the main body 1 of the surveying drone, and extends the surveying time.

[0031] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 8 A flow groove 14 is provided on the circular plate 4. The flow groove 14 is connected to the storage tank 6 and the hollow shaft 7 respectively. A rotary joint 15 is installed on the hollow shaft 7. A water injection pipe 16 is fixed at one end of the rotary joint 15.

[0032] Both water outlet pipes 9 are connected to T-shaped water distribution joints 17, and the water inlet pipe 16 is connected to the T-shaped water distribution joints 17 through a pipe.

[0033] A piston plate 18 is provided in the storage slot 6. The piston plate 18 is slidably connected to the support leg 5. A first spring 19 is provided in the storage slot 6. One end of the first spring 19 is fixedly connected to the piston plate 18, and the other end of the first spring 19 is fixedly connected to the support leg 5.

[0034] Two miniature electric push rods 20 are fixed on the mounting base 2. The piston rods of the two miniature electric push rods 20 are fixedly connected to the two extrusion plates 10 respectively. One end of each extrusion plate 10 is fixed with a guide block 21. A guide rod 22 is fixed on the mounting base 2. The guide block 21 and the guide rod 22 are slidably connected.

[0035] refer to Figures 1 to 6 To ensure the stability of the surveying drone body 1 during flight in complex airflow environments, it is necessary to adjust the counterweight of the surveying drone body 1 to make it less susceptible to interference. Before the surveying drone body 1 takes flight, water for counterweight can be added to the flexible water storage bag 8 at the center of the support base 3. Water is added to the flexible water storage bag 8 after the preset amount of water is reached. The flexible water storage bag 8 has a water injection pipe installed on its water injection port, one end of which is installed on the support base 3 and has a sealing cap. This allows for direct addition of water to one side of the surveying drone body 1, eliminating the need to disassemble the surveying drone body 1 and improving the convenience of adding counterweight. The piston rods of the miniature electric push rods 20 on both sides of the support base 3 are initially extended. When the counterweight is adjusted, the piston rods of the two miniature electric push rods 20 retract, causing the two extrusion plates 10 to move horizontally, so as to extrude pressure on both sides of the flexible water storage bag 8. The water in the flexible water storage bag 8 is affected by the pressure and is transported to the T-shaped water distribution joint 17 through the water outlet pipes 9 at both ends of the flexible water storage bag 8. The T-shaped water distribution joint 17 conveniently injects water into the two adjacent water injection pipes 16 through two pipes, and finally through the rotary joint 15 and the hollow shaft 7. The cooperation with the flow channel 14 allows water to be injected into the storage tank 6 of the support leg 5. The piston plate 18 in the storage tank 6 is affected by the water pressure, causing the piston plate 18 to slide in the storage tank 6. The first spring 19 stores force to increase the water storage space of the storage tank 6, which can achieve the purpose of flexibly increasing the counterweight of the support leg 5. When the support leg 5 with added counterweight rotates to adjust the center of gravity, it can ensure that the main body of the surveying drone 1 is not easily disturbed when flying in complex airflow environment, reducing shaking. At the same time, when the main body of the surveying drone 1 hovers for surveying, it can further improve stability. The guide rod 22 and guide block 21 work together to ensure that the extrusion plate 10 can move smoothly, thereby improving the extrusion effect on the flexible water storage bag 8.

[0036] When it is necessary to reduce the counterweight of the support leg 5, the piston rods of the two miniature electric push rods 20 extend to reduce the pressure of the flexible water storage bag 8. As the pressure of the flexible water storage bag 8 decreases, the water pressure on the piston plate 18 also decreases synchronously. When the first spring 19 releases its elastic force, it can cause the piston plate 18 to slide in the storage groove 6 of the support leg 5, reducing the water storage space and allowing the water to flow back into the flexible water storage bag 8. This achieves the purpose of reducing the counterweight of the support leg 5, so as to adjust the counterweight of the support leg 5 and further improve the flexibility of the surveying UAV body 1 in increasing or decreasing the counterweight in complex airflow environments, and improve the stability of the surveying UAV body 1 in hovering surveying.

[0037] The flexible water storage bag 8 is made of rubber and can be deformed when squeezed.

[0038] Example 3 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1 to 8 The drain pipe 23 is connected to the flow channel 14, and a sealing plug 25 is provided inside the drain pipe 23. A sealing cap 26 is fixed at one end of the drain pipe 23. The sealing plug 25 is located inside the flow channel 14 and is inserted into one end of the drain pipe 23.

[0039] A sliding rod 24 is fixed on the sealing plug 25. The sliding rod 24 is slidably connected to the sealing cover 26. A second spring 27 is provided on the side of the sliding rod 24 away from the sealing plug 25. One end of the second spring 27 is connected to the sealing cover 26 and the other end is connected to the sliding rod 24. A drainage component for adjusting the moving position of the sealing plug 25 is provided on the support base 3.

[0040] The drainage assembly includes a first abutment wedge 28, which is slidably connected to the support base 3. A strip plate 29 is fixed on the first abutment wedge 28, and a third spring 30 is fixed on the strip plate 29. One end of the third spring 30 is fixedly connected to the support base 3. A second abutment wedge 31 is fixed on the strip plate 29, and an abutment rod 32 is fixed on the compression plate 10.

[0041] refer to Figures 1 to 8 In some special circumstances, such as forgetting to bring a spare battery, or when the surveying work is not yet completed but the power may be insufficient, it is necessary to adjust the counterweight to improve the endurance of the surveying drone. In this case, the piston rods of the two micro electric push rods 20 are controlled to retract, so that when the extrusion plate 10 moves, it drives the abutment rod 32 to move horizontally in sync. This allows the abutment rod 32 to abut against the second abutment wedge 31 on the strip plate 29, so that the strip plate 29 drives the first abutment wedge 28 fixed at both ends to slide on the support base 3. The third spring 30 stores... At this time, the drain pipe 23 on the mounting base 2 is located below the first abutting wedge 28, so that when the first abutting wedge 28 moves down, it can abut against one end of the abutting slide bar 24, causing the abutting slide bar 24 to slide on the sealing plug 25. The second spring 27 stores force so that the abutting slide bar 24 can drive the sealing plug 25 to separate from the drain pipe 23, so that the water in the flow channel 14 can be automatically discharged through the gap between the abutting slide bar 24 and the drain pipe 23, thereby reducing the load on the main body 1 of the surveying UAV, improving its endurance and extending the surveying time; When the water pressure in the flexible water storage bag 8 and the flow channel 14 decreases, the first spring 19 releases its elasticity, which causes the piston plate 18 to slide in the storage channel 6 of the support leg 5, reducing the water storage space so that the water can flow back into the flow channel 14 and be discharged through the drain pipe 23.

[0042] Example 4 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1 to 8 This application also provides a drainage component technical solution, the drainage component includes an arc-shaped block 33, the arc-shaped block 33 is fixed on the lower surface of the support base 3, and the arc-shaped block 33 is provided with an abutment groove 34.

[0043] refer to Figures 2 to 8The servo motor 12 can adjust the deflection angle of the support leg 5 by rotating in both directions, thereby adjusting the center of gravity of the surveying drone body 1. When the motor shaft of the servo motor 12 drives the hollow shaft 7 to rotate at a certain angle, the circular piece 4 will synchronously drive the drain pipe 23 to rotate, so that the drain pipe 23 is close to the arc block 33, so that the abutting slide 24 on the drain pipe 23 contacts the abutting groove 34 on the arc block 33. After the abutting slide 24 is abutted, it drives the sealing plug 25 to separate from the drain pipe 23, so that the water in the flow channel 14 is automatically discharged through the gap between the abutting slide 24 and the drain pipe 23, thereby reducing the load on the surveying drone body 1 and improving the endurance.

[0044] The main body 1 of the surveying UAV, the servo motor 12, and the miniature electric push rod 20 are all electrically connected to the controller via wires.

[0045] 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.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A balancing device for hovering a surveying unmanned aerial vehicle (UAV), comprising the main body of the surveying UAV (1), characterized in that: The main body (1) of the surveying drone is fixed with a support base (3) at the bottom. The bottom of the support base (3) is provided with several rotatable circular pieces (4), and the circular pieces (4) are eccentrically provided with support legs (5). A hollow shaft (7) is fixed on the circular pieces (4), and the lower end of the hollow shaft (7) is fixedly connected to the circular pieces (4). A circular storage slot (6) is opened in the support leg (5). The support base (3) is fixed with a mounting base (2), the mounting base (2) is fixed with a flexible water storage bag (8), and the flexible water storage bag (8) is provided with water outlet pipes (9) on both sides. The mounting base (2) is provided with movable extrusion plates (10) on both sides. The circular plate (4) is provided with a drain pipe (23) on one side.

2. The balancing device for hovering a surveying UAV according to claim 1, characterized in that: A first gear (11) is fixed on the hollow shaft (7), a servo motor (12) is fixed on the support base (3), and a second gear (13) is installed on the motor shaft of the servo motor (12). The second gear (13) meshes with the first gear (11).

3. The balancing device for hovering a surveying UAV according to claim 2, characterized in that: The circular plate (4) has a flow groove (14) which is connected to the storage tank (6) and the hollow shaft (7) respectively. A rotary joint (15) is installed on the hollow shaft (7), and a water injection pipe (16) is fixed at one end of the rotary joint (15).

4. The balancing device for hovering a surveying UAV according to claim 3, characterized in that: Both of the water outlet pipes (9) are connected to T-shaped water distribution joints (17), and the water inlet pipe (16) is connected to the T-shaped water distribution joints (17) through a pipe.

5. The balancing device for hovering a surveying UAV according to claim 4, characterized in that: A piston plate (18) is provided in the storage slot (6). The piston plate (18) is slidably connected to the support leg (5). A first spring (19) is provided in the storage slot (6). One end of the first spring (19) is fixedly connected to the piston plate (18), and the other end of the first spring (19) is fixedly connected to the support leg (5).

6. The balancing device for hovering a surveying UAV according to claim 5, characterized in that: Two miniature electric push rods (20) are fixed on the mounting base (2). The piston rods of the two miniature electric push rods (20) are respectively fixedly connected to the two extrusion plates (10). One end of each of the two extrusion plates (10) is fixed with a guide block (21). A guide rod (22) is fixed on the mounting base (2). The guide block (21) is slidably connected to the guide rod (22).

7. The balancing device for hovering a surveying UAV according to claim 3, characterized in that: The drain pipe (23) is connected to the flow channel (14), and a sealing plug (25) is provided inside the drain pipe (23). A sealing cap (26) is fixed at one end of the drain pipe (23). The sealing plug (25) is located inside the flow channel (14), and the sealing plug (25) is inserted into one end of the drain pipe (23).

8. The balancing device for hovering a surveying UAV according to claim 7, characterized in that: A sliding rod (24) is fixed on the sealing plug (25). The sliding rod (24) is slidably connected to the sealing cover (26). A second spring (27) is provided on the side of the sliding rod (24) away from the sealing plug (25). One end of the second spring (27) is connected to the sealing cover (26), and the other end is connected to the sliding rod (24). A drainage assembly for adjusting the moving position of the sealing plug (25) is provided on the support base (3).

9. The balancing device for hovering a surveying UAV according to claim 8, characterized in that: The drainage assembly includes a first abutting wedge (28), which is slidably connected to the support base (3). A strip plate (29) is fixed on the first abutting wedge (28), and a third spring (30) is fixed on the strip plate (29). One end of the third spring (30) is fixedly connected to the support base (3). A second abutting wedge (31) is fixed on the strip plate (29), and an abutting rod (32) is fixed on the extrusion plate (10).

10. The balancing device for hovering a surveying UAV according to claim 8, characterized in that: The drainage component includes an arc-shaped block (33), which is fixed on the lower surface of the support base (3), and the arc-shaped block (33) is provided with an abutment groove (34).

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