A falling test device for adjusting the attitude of a drone

Abstract

The utility model relates to unmanned aerial vehicle drop test technical field, especially unmanned aerial vehicle attitude adjustment's drop test device, including mounting bracket, elevating gear, electric clamp jaw assembly and angle adjusting assembly, angle adjusting assembly includes fixed frame, first drive unit, connecting frame, second drive unit and swing seat, elevating gear sets up in mounting bracket, elevating gear is driven and is connected with fixed frame, is used for driving fixed frame to go up and down, first drive unit sets up in fixed frame, is used for driving connecting frame to rotate around the vertical axis of fixed frame, swing seat is hinged with connecting frame, second drive unit sets up in connecting frame, is used for driving swing seat to swing in -90 ~ +90 range around the horizontal axis of connecting frame, electric clamp jaw assembly sets up in the bottom of swing seat, is used for clamping unmanned aerial vehicle, the utility model discloses when unmanned aerial vehicle drop test, can realize unmanned aerial vehicle in -90 ~ +90 range's elevation attitude adjustment, can realize the circumferential attitude adjustment of unmanned aerial vehicle simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of drone drop test technology, and in particular to a drop test device for drone attitude adjustment. Background Technology

[0002] Drone drop tests typically involve using pulleys and ropes to lift the drone to a designated height, then releasing it for drop observation. However, this method cannot achieve drop tests of drones in specific attitudes. To address this, an existing patent (publication number: CN109383848B) discloses a drop test fixture for small fixed-wing UAVs, comprising a fixture frame, an angle disk, a sliding unit, and an aircraft fixing unit. The sliding unit includes a linear rail, an upper slider, a lower slider, and a hook mechanism. The angle disk is detachably fixed to the fixture frame. The linear rail is suspended on the fixture frame by means of the angle disk in a manner that allows adjustment of its tilt relative to the ground, with the guide rail surface facing the ground. The upper and lower sliders are mounted side-by-side on the linear rail in a manner that allows them to slide up and down. An upper limit block is provided at the upper part of the linear rail, and the upper slider can drive the lower slider to slide upward. When the upper slider slides to touch the upper limit block, the lower slider disengages from the hook. A lower limit block is installed at the lower end of the linear rail, and an aircraft fixing unit is fixedly installed on the lower slider. The aircraft fixing unit is equipped with a magnet that magnetically attracts the aircraft.

[0003] While the aforementioned drop test fixture for drones allows for different height and angle adjustments to simulate various drop conditions, its angle dial only enables elevation adjustment within the 0–90° range, failing to achieve elevation adjustment within the -90°–+90° range. This results in an excessively limited elevation adjustment range. Furthermore, it also lacks circumferential angle adjustment capabilities, restricting attitude control and consequently limiting drop test data. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a drop test device for drone attitude adjustment. During drone drop tests, the device can adjust the drone's elevation angle within the range of -90° to +90°, and simultaneously adjust the drone's circumferential angle, effectively avoiding limitations on drone attitude adjustment and thus effectively avoiding limitations on drone drop test data.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A drop test device for adjusting the attitude of a drone includes a mounting frame, a lifting device, an electric gripper assembly, and an angle adjustment assembly. The angle adjustment assembly includes a fixed frame, a first drive unit, a connecting frame, a second drive unit, and a swing seat. The lifting device is mounted on the mounting frame and is drivenly connected to the fixed frame, driving the fixed frame to move up and down. The first drive unit is mounted on the fixed frame and drives the connecting frame to rotate around the vertical axis of the fixed frame. The swing seat is hinged to the connecting frame. The second drive unit is mounted on the connecting frame and drives the swing seat to swing around the horizontal axis of the connecting frame within the range of -90° to +90°. The electric gripper assembly is located at the bottom of the swing seat and is used to grip the drone to be dropped.

[0007] The beneficial effects of this utility model are:

[0008] In use, the drop test device for drone attitude adjustment of this utility model lowers the angle adjustment assembly to a specific height via a lifting device. Then, the electric gripper assembly clamps the drone to be tested. Next, the first drive unit drives the connecting frame to rotate around the vertical axis of the fixed frame to a specific angle, realizing the circumferential angle adjustment of the drone. Simultaneously, the second drive unit drives the swing seat to swing around the horizontal axis of the connecting frame within the range of -90° to +90° to a specific angle, realizing the elevation angle attitude adjustment of the drone. At this time, the lifting device drives the angle adjustment assembly to rise to a specific height. Finally, the electric gripper assembly releases the grip on the drone, allowing the drone to fall freely to the ground, thus completing the drone drop test. Therefore, this utility model can simulate drone drops at different heights during drone drop tests, realize elevation angle attitude adjustment within the range of -90° to +90°, and realize circumferential attitude angle adjustment of the drone, thereby effectively avoiding limitations on drone attitude adjustment and thus effectively avoiding limitations on drone drop test data.

[0009] Furthermore, the rotation angle range of the connecting frame is -180° to +180°.

[0010] Beneficial effect: It can simulate the drop test of drones under different rotational attitudes.

[0011] Furthermore, the first drive unit includes a first servo motor and a first harmonic reducer. The first servo motor is fixed on the fixed frame and driven by the first harmonic reducer. The first servo motor is used to drive the first harmonic reducer to rotate the connecting frame.

[0012] Beneficial effect: It can ensure that the connecting frame rotates to a preset precise angle around the vertical axis of the fixed frame.

[0013] Furthermore, the second drive unit includes a second servo motor and a second harmonic reducer. The second servo motor is fixed on the connecting frame and driven by the second harmonic reducer. The second servo motor is used to drive the second harmonic reducer to rotate the swing seat.

[0014] Beneficial effect: It can ensure that the swing seat rotates around the connecting frame to a preset precise angle.

[0015] Furthermore, the single adjustment angle of the first servo motor is 1.5°.

[0016] Beneficial effects: When adjusting the circumferential attitude of the drone, it can meet the drop test requirements for minor attitude adjustments of the drone.

[0017] Furthermore, the single adjustment angle of the second servo motor is 1.5°.

[0018] Beneficial effect: When adjusting the drone's pitch angle, it can meet the drop test requirements for minor attitude adjustments of the drone.

[0019] Furthermore, the lifting device includes two lifting mechanisms and two connecting plates. The two lifting mechanisms are respectively disposed on opposite sides of the mounting frame. The two lifting mechanisms are respectively driven connected to the two connecting plates. The two connecting plates lift synchronously. The two connecting plates are respectively connected and fixed to opposite sides of the fixed frame.

[0020] Beneficial effect: Ensures the stability of the lifting and lowering of the connecting plate, thereby enabling the angle adjustment assembly to lift and lower stably.

[0021] Furthermore, guide rails are provided on both opposite sides of the mounting bracket, the guide rails extend vertically, and the connecting plate is slidably connected to the guide rails.

[0022] Beneficial effect: Further ensures the stability of the angle adjustment assembly during the lifting process.

[0023] Furthermore, the lifting mechanism includes a third servo motor, a worm gear reducer, a driving wheel, a driven wheel, and a synchronous belt. The driving wheel is rotatably mounted at the bottom of the mounting frame, and the driven wheel is rotatably mounted at the top of the mounting frame. The third servo motor is fixed to the bottom of the mounting frame and driven by the worm gear reducer. The worm gear reducer is driven by the driving wheel. The synchronous belt is sleeved on the driving wheel and the driven wheel, and both ends of the synchronous belt are respectively connected and fixed to the upper and lower ends of the connecting plate. The third servo motor drives the worm gear reducer to drive the synchronous belt to lift and lower the connecting plate.

[0024] Beneficial effects: By utilizing the self-locking characteristic of the reverse stroke of the worm gear reducer, the angle adjustment assembly can be prevented from falling when the power is off, ensuring the safety and reliability of the angle adjustment assembly during the lifting process.

[0025] Furthermore, the guide rail is a cylindrical slide rail.

[0026] Beneficial effect: It can reduce the friction between the connecting plate and the guide rail. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the drop test device for adjusting the attitude of a drone according to this utility model.

[0028] Figure 2 for Figure 1 Enlarged structural diagram at point E;

[0029] Figure 3 for Figure 1 Sectional view at point BB;

[0030] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0031] Figure 5 for Figure 3 Enlarged structural diagram at point C;

[0032] Figure 6 This is a schematic diagram of the angle adjustment assembly involved in this embodiment;

[0033] Figure 7 for Figure 6 Another structural diagram from a different angle;

[0034] Figure 8 for Figure 7 Enlarged structural diagram at point D;

[0035] Figure 9 This is a schematic diagram of the electric clamping unit involved in this embodiment.

[0036] Icon labels:

[0037] 1. Mounting bracket; 10. Base; 11. Support frame; 12. Square tube; 120. Square tube connecting fastener; 2. Lifting mechanism; 20. Third servo motor; 21. Worm gear reducer; 22. Driving wheel; 23. Driven wheel; 24. Synchronous belt; 25. Connecting plate; 26. Guide rail; 3. Angle adjustment assembly; 30. Fixing frame; 301. Connecting part; 31. First drive unit; 310. First servo motor; 311. First harmonic reducer; 32. Connecting frame; 33. Second drive unit; 330. Second servo motor; 331. Second harmonic reducer; 34. Swing seat; 4. Control platform; 5. Electric gripper assembly; 50. Electric clamping unit; 51. Housing; 52. Mounting plate; 53. Gripper. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0039] In the description of this utility model, it should be understood that the terms "width," "upper," "lower," "front," "rear," "top," and "bottom," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this invention, unless otherwise expressly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not being in direct contact but through another feature between them.

[0041] Please refer to Figure 1 - Figure 9 This utility model provides a drop test device for adjusting the attitude of a drone, including a mounting frame 1, a lifting device, an electric gripper assembly 5, and an angle adjustment assembly 3.

[0042] The angle adjustment assembly 3 includes a fixed frame 30, a first drive unit 31, a connecting frame 32, a second drive unit 33, and a swing seat 34. The first drive unit 31 is mounted on the fixed frame 30 and drives the connecting frame 32 to rotate around the vertical axis of the fixed frame 30 within an angle range of -180° to +180°. The swing seat 34 is hinged to the connecting frame 32. The second drive unit 33 is mounted on the connecting frame 32 and drives the swing seat 34 to swing around the horizontal axis of the connecting frame 32 within a range of -90° to +90°. The electric gripper assembly 5 is located at the bottom of the swing seat 34 and is used to grip the drone to be subjected to a drop test. The fixed frame 30 is driven by a lifting device mounted on the mounting frame 1, meaning that the angle adjustment assembly 3 rises or falls under the drive of the lifting device.

[0043] The drop test method for the UAV in this embodiment is as follows: First, the angle adjustment assembly 3 is driven to descend to a specific height by the lifting device, and the UAV to be tested is clamped and fixed by the electric gripper assembly 5; Second, the connecting frame 32 is driven to rotate around the vertical axis of the fixed frame 30 to a specific angle by the first drive unit 31, thereby adjusting the circumferential attitude angle of the UAV. At the same time, the swing seat 34 is driven to swing around the horizontal axis of the connecting frame 32 within the range of -90° to +90° to a specific angle by the second drive unit 33, thereby adjusting the pitch attitude of the UAV, thus completing the adjustment of the circumferential and pitch attitude of the UAV; Third, the angle adjustment assembly 3 is driven to rise to a specific height by the lifting device; Fourth, the electric gripper assembly 5 releases its grip on the UAV, allowing the UAV to fall freely and crash to the ground, thereby completing the drop test of the UAV.

[0044] Therefore, it can be seen that the drone attitude adjustment drop test device of this embodiment can simulate the drone falling at different heights when conducting drone drop tests. It can realize the elevation attitude adjustment of the drone in the range of -90° to +90° and the circumferential attitude angle adjustment of the drone in the range of -180° to +180°, thereby effectively avoiding the limitation of drone attitude adjustment and thus avoiding the limitation of drone drop test data.

[0045] In this embodiment, the first drive unit 31 includes a first servo motor 310 and a first harmonic reducer 311. The first servo motor 310 is fixed on the fixed frame 30 and driven by the first harmonic reducer 311. The first servo motor 310 drives the first harmonic reducer 311 to rotate the connecting frame 32 around the fixed frame 30. The first drive unit 31 uses the combination of the first servo motor 310 and the first harmonic reducer 311 to achieve high-precision rotation control of the connecting frame 32, thereby ensuring that the connecting frame 32 rotates around the vertical axis of the fixed frame 30 to a preset precise angle.

[0046] In this embodiment, the second drive unit 33 includes a second servo motor 330 and a second harmonic reducer 331. The second servo motor 330 is fixed on the connecting frame 32 and driven by the second harmonic reducer 331. The second servo motor 330 drives the second harmonic reducer 331 to rotate the swing seat 34. The second drive unit 33 uses the combination of the second servo motor 330 and the second harmonic reducer 331 to achieve high-precision rotation control of the swing seat 34, thereby ensuring that the swing seat 34 rotates around the connecting frame 32 to a preset precise angle.

[0047] It should be noted that the first harmonic reducer 311 and the second harmonic reducer 331 produce the same result. The first harmonic reducer 311 or the second harmonic reducer 331 consists of a wave generator, a flexure, and a steel wheel. The wave generator comprises an elliptical cam and a flexible bearing. The elliptical cam is typically made of high-strength alloy steel (such as 45# steel), while the flexible bearing is made of a highly elastic material (such as SNCM439). The wave generator acts as the driving element, generating controllable elastic deformation waves through rotation to drive the flexure periodically. Elastic deformation; the flexible wheel is an ultra-thin metal cup-shaped structure with a toothed ring on the outer wall. Its number of teeth is two fewer than that of the rigid wheel. The flexible wheel is usually made of high-strength alloy steel (such as 40Cr). The function of the flexible wheel is to generate elastic deformation under the action of the wave generator. The toothed ring meshes with the rigid wheel in a staggered manner to realize motion transmission. The steel wheel is a rigid internal toothed ring with two more teeth than the flexible wheel. The steel wheel is usually made of high-strength alloy steel (such as 2Cr13 stainless steel). The function of the steel wheel is to act as a fixed part or a driven part, meshing with the flexible wheel to transmit torque.

[0048] The structure and working principle of the first harmonic reducer 311 or the second harmonic reducer 331 are existing technologies and will only be briefly described here: The working principle of the first harmonic reducer 311 or the second harmonic reducer 331 is as follows: high-precision speed reduction is achieved through the elastic deformation of the flexible wheel. Specifically, it can be understood that any one of the three components—wave generator, flexible wheel, and steel wheel—is fixed, while the other two are one driving component and one driven component, thus achieving speed reduction. When the steel wheel is fixed, the wave generator is the driving component, and the flexible wheel is the driven component. The flexible wheel deforms under the action of the elliptical cam. The flexible wheel teeth at both ends of the long axis of the wave generator fully mesh with the steel wheel teeth, while the flexible wheel teeth at both ends of the short axis fully disengage from the steel wheel teeth. Since the number of teeth on the flexible wheel is two fewer than that on the steel wheel, when the wave generator rotates one revolution, the flexible wheel rotates two teeth in the opposite direction, thereby achieving a large speed reduction ratio. Thus, by utilizing the characteristics of the first harmonic reducer 311 and the second harmonic reducer 331, a small volume and large torque adjustment of the angle adjustment assembly 3 are achieved.

[0049] In this embodiment, refer to Figure 6 The single adjustment angle of the first servo motor 310 is 1.5°, that is, the single rotation angle of the connecting frame 32 is 1.5°. For example, the rotation angle of the connecting frame 32 is -180° or -178.5° or -177° or 180° or 178.5° or 177° or 1.5° or -1.5° or 3° or -3°, etc. In this way, when adjusting the circumferential attitude of the UAV, the drop test requirements for the small adjustment of the circumferential attitude of the UAV can be met. Similarly, the single adjustment angle of the second servo motor 330 is also 1.5°, that is, the single rotation angle of the swing seat 34 is 1.5°. For example, the rotation angle of the swing seat 34 is -90° or -88.5° or -87° or 90° or 88.5° or 87° or 1.5° or -1.5° or 3° or -3° or 4.5°, etc. In this way, when adjusting the pitch angle attitude of the UAV, the drop test requirements for the UAV's pitch angle attitude micro-adjustment can be met.

[0050] In this embodiment, the lifting device is mounted on the mounting frame 1, and the lifting device is used to drive the angle adjustment assembly 3 to move up and down. Specifically, the lifting device includes two lifting mechanisms 2 and two connecting plates 25. The two lifting mechanisms 2 are respectively disposed on opposite sides of the mounting frame 1, and the two lifting mechanisms 2 are respectively driven and connected to the two connecting plates 25. Of course, the two connecting plates 25 move up and down synchronously, and the two connecting plates 25 are respectively connected and fixed to the connecting portions 301 on opposite sides of the fixed frame 30.

[0051] The two lifting mechanisms 2 have the same structure. Taking one lifting mechanism 2 as an example, the lifting mechanism 2 includes a third servo motor 20, a worm gear reducer 21, a driving wheel 22, a driven wheel 23, and a synchronous belt 24. The driving wheel 22 is rotatably mounted at the bottom of the mounting frame 1, and the driven wheel 23 is rotatably mounted at the top of the mounting frame 1. The third servo motor 20 is fixed to the bottom of the mounting frame 1 and is driven by the worm gear reducer 21. The worm gear reducer 21 is driven by the driving wheel 22. The synchronous belt 24 is driven and sleeved on the driving wheel 22 and the driven wheel 23, and both ends of the synchronous belt 24 are respectively connected and fixed to the upper and lower ends of the connecting plate 25. The third servo motor 20 drives the worm gear reducer 21 to drive the synchronous belt 24 to drive the connecting plate 25 to move up and down, thereby driving the angle adjustment assembly 3 to move up and down.

[0052] Because the worm gear reducer 21 has a reverse self-locking characteristic, when the third servo motor 20 is powered off, the angle adjustment assembly 3 will not slide down due to gravity or external force, ensuring the safety and reliability of the angle adjustment assembly 3 during the lifting process. In addition, the two lifting mechanisms 2 are located on opposite sides of the mounting frame 1, and drive the two connecting plates 25 to lift synchronously via the synchronous belt 24, which can achieve stable lifting of the angle adjustment assembly 3.

[0053] In this embodiment, the third servo motor 20 of the two lifting mechanisms 2 can be connected to a control platform 4 (such as a PLC control system) fixed on the mounting frame 1 to realize remote drone drop experiments and increase the safety of the experiments. Furthermore, two guide rails 26 are provided on opposite sides of the mounting frame 1. The guide rails 26 extend vertically, and the connecting plate 25 is slidably connected to the guide rails 26, allowing the connecting plate 25 to move up and down along the guide rails 26. This guides the angle adjustment assembly 3 to move vertically and stably, preventing vibration during the lifting process and further ensuring the stability of the angle adjustment assembly 3 during lifting. In this embodiment, the guide rail 26 is a cylindrical slide rail, and the mounting plate 52 is connected to the cylindrical slide rail via a linear bearing. This effectively reduces the friction between the connecting plate 25 and the guide rail 26, improving the smoothness of the lifting of the angle adjustment assembly 3.

[0054] In this embodiment, the electric gripper assembly 5 includes two electric gripping units 50. Each electric gripping unit 50 includes a housing 51, a drive mechanism, a mounting plate 52, and grippers 53. The two housings 51 are fixed at intervals to the bottom of the swing seat 34. Each gripper 53 is fixed on each mounting plate 52. Each drive mechanism is disposed inside the housing 51. Each drive mechanism is used to drive each mounting plate 52 to move each gripper 53, so that the two grippers 53 move towards each other or away from each other.

[0055] Understandably, when the two grippers 53 move towards each other, they clamp and secure the drone; when they move away from each other, they release the drone. The drive mechanism employs a rack and pinion drive structure, thus enabling a large stroke movement of the mounting plate 52.

[0056] In this embodiment, the mounting frame 1 includes a base 10 and a support frame 11. The base 10 can be welded together from multiple pipes. The support frame 11 is fixed to the base 10 and is formed by splicing and fixing multiple square tubes 12. That is, it can be understood that two adjacent square tubes 12 on the support frame 11 are connected and fixed by square tube connecting fasteners 120, and the square tube connecting fasteners 120 and the square tubes 12 are fixed together by bolts. In this way, the mounting frame 1 can be easily assembled and debugged on site, and is also easy to transport.

[0057] In addition, a protective structure is set up around the drone drop area. The entrance of the protective structure is equipped with a sensor grating controlled by the control platform 4. The sensor grating detects whether anyone has entered the drone drop area, ensuring the safety of the drone drop test.

[0058] In summary, the drop test device for UAV attitude adjustment of this utility model has the following beneficial effects:

[0059] First, it can meet the drop test requirements of drones in different altitude scenarios;

[0060] Second, the first drive unit 31 uses a combination of a first servo motor 310 and a first harmonic reducer 311 to achieve elevation attitude adjustment of a large UAV (weighing 16KG) within the range of -90° to +90°; the second drive unit 33 uses a combination of a second servo motor 330 and a second harmonic reducer 331 to achieve circumferential attitude adjustment of a large UAV (weighing 16KG) within the range of -180° to +180°, and the angle adjustment accuracy meets the single adjustment requirement of 1.5°.

[0061] Third, it enables remote drone drop experiments, increasing the reliability and safety of the experiments.

[0062] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A drop test device for adjusting the attitude of a drone, characterized in that, The device includes a mounting frame, a lifting device, an electric gripper assembly, and an angle adjustment assembly. The angle adjustment assembly includes a fixed frame, a first drive unit, a connecting frame, a second drive unit, and a swing seat. The lifting device is mounted on the mounting frame and is drivenly connected to the fixed frame, driving the fixed frame to move up and down. The first drive unit is mounted on the fixed frame and drives the connecting frame to rotate around the vertical axis of the fixed frame. The swing seat is hinged to the connecting frame, and the second drive unit is mounted on the connecting frame, driving the swing seat to swing around the horizontal axis of the connecting frame within the range of -90° to +90°. The electric gripper assembly is located at the bottom of the swing seat and is used to grip the drone to be subjected to a drop test.

2. The drop test device for UAV attitude adjustment according to claim 1, characterized in that, The rotation angle range of the connecting frame is -180° to +180°.

3. The drop test device for UAV attitude adjustment according to claim 1, characterized in that, The first drive unit includes a first servo motor and a first harmonic reducer. The first servo motor is fixed on a fixed frame and driven by the first harmonic reducer. The first servo motor is used to drive the first harmonic reducer to rotate the fixed frame.

4. The drop test device for UAV attitude adjustment according to claim 1, characterized in that, The second drive unit includes a second servo motor and a second harmonic reducer. The second servo motor is fixed on the connecting frame and driven by the second harmonic reducer. The second servo motor is used to drive the second harmonic reducer to rotate the swing seat.

5. The drop test device for UAV attitude adjustment according to claim 3, characterized in that, The single adjustment angle of the first servo motor is 1.5°.

6. The drop test device for UAV attitude adjustment according to claim 4, characterized in that, The second servo motor has a single adjustment angle of 1.5°.

7. The drop test device for UAV attitude adjustment according to claim 1, characterized in that, The lifting device includes two lifting mechanisms and two connecting plates. The two lifting mechanisms are respectively arranged on opposite sides of the mounting frame. The two lifting mechanisms are respectively driven and connected to the two connecting plates. The two connecting plates lift and lower synchronously. The two connecting plates are respectively connected and fixed to opposite sides of the fixed frame.

8. The drop test device for UAV attitude adjustment according to claim 7, characterized in that, Guide rails are provided on both opposite sides of the mounting bracket, the guide rails extend vertically, and the connecting plate is slidably connected to the guide rails.

9. A drop test device for UAV attitude adjustment according to claim 8, characterized in that, The lifting mechanism includes a third servo motor, a worm gear reducer, a driving wheel, a driven wheel, and a synchronous belt. The driving wheel is rotatably mounted at the bottom of the mounting frame, and the driven wheel is rotatably mounted at the top of the mounting frame. The third servo motor is fixed to the bottom of the mounting frame and driven by the worm gear reducer. The worm gear reducer is driven by the driving wheel. The synchronous belt is sleeved on the driving wheel and the driven wheel, and both ends of the synchronous belt are respectively connected and fixed to the upper and lower ends of the connecting plate. The third servo motor drives the worm gear reducer to drive the synchronous belt, thereby raising and lowering the connecting plate.

10. A drop test device for UAV attitude adjustment according to claim 8, characterized in that, The guide rail is a cylindrical slide rail.

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