Aerial photography damping device for small unmanned aerial vehicle

Abstract

The invention discloses an aerial photography damping device for a small unmanned aerial vehicle, and relates to the technical field of aerial photography damping. The device comprises a top disc and a bottom disc, the top disc is fixedly installed at the bottom of the unmanned aerial vehicle, multiple sets of welding discs are annularly arranged at the bottom of the top disc, multiple sets of spiral damping elastic strips are welded to the bottoms of the welding discs, sliding blocks are fixedly connected to the bottoms of the spiral damping elastic strips, and multiple sets of adjusting discs are rotatably installed at the top of the bottom disc; the adjusting disc and the welding disc are correspondingly arranged, multiple sets of linear sliding openings are formed in the adjusting disc, multiple sets of arc-shaped guide grooves are formed in the top of the bottom disc, the sliding blocks are connected into the linear sliding openings in a sliding mode, and the guide columns are inserted into the arc-shaped guide grooves. When the aerial camera lens rotates, the number of winding turns of the spiral damping elastic strip is increased, the bottom ends of the spiral damping elastic strip are closed, so that damping can be increased, the stability of the lens during rotary shooting is guaranteed, meanwhile, a rotary closing damping adjusting mode is adopted, and the adjusting mode is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of aerial photography shock absorption, and specifically relates to a shock absorption device for aerial photography of small unmanned aerial vehicles. Background Art

[0002] With the continuous development of unmanned aerial vehicle technology, especially in the field of aerial photography, the application of unmanned aerial vehicles has gradually penetrated into all walks of life, including agricultural monitoring, environmental protection, urban planning, film shooting, etc. However, in these applications, the stability and image quality of unmanned aerial vehicles have always been the core issues concerned by users. Especially during aerial photography, the vibration of the unmanned aerial vehicle will affect the imaging device, resulting in a decline in image quality and even affecting the accuracy of post-processing.

[0003] In a Chinese patent (publication number: CN107444666A), an aerial photography unmanned aerial vehicle with a camera shock absorption device is disclosed, which includes an unmanned aerial vehicle housing, rotating propellers, a camera shock absorption sleeve, and a controller. The shock absorption is mainly achieved by setting the camera shock absorption sleeve and shock absorption balls. However, the shock absorption of this structure is evenly distributed. When the center of gravity of the aerial photography device is not at the installation center or the rotation center, it will cause the aerial photography device to tilt during installation. At the same time, during actual use, the lens of the aerial photography device needs to rotate. By rotating the lens, the camera can more flexibly adjust the shooting angle and broaden the shooting range. Especially when shooting complex scenes or requiring multi-angle images, rotating the lens can effectively meet the needs. However, the center of gravity of most aerial photography device lenses is not at the rotation center, which leads to the situation of center of gravity offset when the lens rotates. During installation, the shock absorption device will not tilt in the direction of center of gravity offset. And according to the principle of mechanics, center of gravity offset means that more inertial force will be generated on that side, which may cause vibration or imbalance. Therefore, the shock absorption damping on the offset side needs to adapt to this additional force, and neither the above-mentioned patent nor the existing shock absorbers have the effect of adjusting shock absorption damping according to the center of gravity, resulting in poor shock absorption effect. Summary of the Invention

[0004] The purpose of the present invention is: to solve the above problems, the present invention provides a shock absorption device for aerial photography of small unmanned aerial vehicles.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose: A shock absorption device for aerial photography of small unmanned aerial vehicles includes a top plate and a bottom plate. The top plate is fixedly installed at the bottom of the unmanned aerial vehicle. A plurality of welding plates are annularly arranged at the bottom of the top plate. A plurality of spiral shock absorption elastic bars are welded to the bottom of the welding plates. The plurality of spiral shock absorption elastic bars are annularly distributed. The bottom of the spiral shock absorption elastic bar is fixedly connected with a slider, and a guide post is arranged at the bottom of the slider. The chassis is located below the top plate, and the aerial camera lens is installed below the chassis. A plurality of adjusting plates are rotatably installed on the top of the chassis, and the adjusting plates are arranged corresponding to the welding plates. A plurality of linear sliding openings are formed inside the adjusting plates, and a plurality of arc-shaped guide grooves are formed on the top of the chassis. The sliders are slidably connected in the linear sliding openings, and the guide posts are inserted into the arc-shaped guide grooves, and the diameter of the guide posts is larger than the width of the linear sliding openings.

[0006] Further, it further includes a connecting rod fixedly installed on the aerial camera lens. A top block is fixedly installed on the top of the connecting rod. A plurality of driving toothed rods are slidably connected to the bottom of the chassis, and the driving toothed rods are arranged corresponding to the adjusting plates. An arc-shaped pressing strip is arranged on the outer side of the driving toothed rod. An adjusting gear is fixedly connected to the bottom of the adjusting plate, and the adjusting gear meshes with the driving toothed rod. The top block abuts against the arc-shaped pressing strip. The width of the top block is larger than the distance between adjacent arc-shaped pressing strips, and the arc-shaped pressing strips are symmetrically designed with respect to the adjusting gear.

[0007] Further, a guide sleeve is arranged at the bottom of the chassis. A sliding column is arranged at one end of the driving toothed rod away from the arc-shaped pressing strip, and the sliding column is slidably connected in the guide sleeve.

[0008] Further, the connecting rod is fixedly installed on the aerial camera lens through a connecting clamp. The connecting clamp is composed of two semi-circular rings, and the two semi-circular rings are fixedly connected by bolts.

[0009] Further, support columns are arranged at the bottom of the chassis. An aerial camera lens mounting plate is installed at the bottom of the support columns, and the aerial camera lens is installed at the bottom of the aerial camera lens mounting plate. A collar is arranged on the outer side of the connecting rod, and the collar is rotatably installed on the support columns.

[0010] Further, the thickness of the top block is larger than the thickness of the arc-shaped pressing strip.

[0011] Further, a limit bolt is threadedly connected to the outer side of the linear sliding opening.

[0012] Further, the inside of the top plate is designed to be hollow.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention adopts the method of combining a plurality of spiral shock-absorbing elastic strips in a ring shape to provide shock absorption for the aerial vehicle. The structure of the spiral elastic strip is relatively simple and the cost is low. The shock absorption effect can be evenly distributed in the entire ring area. Compared with the traditional single-direction shock absorption, the ring distribution can evenly absorb and disperse the impact force in multiple directions, thereby improving the overall shock absorption performance. This load distribution method not only improves the overall performance of the shock absorption system, but also can avoid the damage caused by the overload of a single elastic strip, thereby prolonging the service life and improving the system stability.

[0014] 2. The present invention controls the rotation of an adjustment disk at a corresponding position while the drone lens rotates. The adjustment disk drives the spiral shock-absorbing spring strip to rotate through a slider. At the same time, under the action of a guide column and an arc guide groove, the slider drives the bottom end of the spiral shock-absorbing spring strip to retract inward, the number of winding turns of the spiral shock-absorbing spring strip increases, and the bottom ends are brought together, thereby increasing the shock-absorbing damping, so that the shock-absorbing damping changes synchronously with the rotation of the lens, thereby ensuring the stability of the lens during rotation and shooting. At the same time, a method of rotating and retracting to adjust the damping is adopted, the adjustment method is simple, and the structure is compact, so that the device can be applied to drones with different center of gravity offsets, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the installation of the shock absorbing device of the present invention; Figure 2 The three-dimensional structure diagram of the shock absorbing device of the present invention is shown in FIG. Figure 1 ; Figure 3 The three-dimensional structure diagram of the shock absorbing device of the present invention is shown in FIG. Figure 2 ; Figure 4 The shock absorbing device of the present invention explodes Figure 1 ; Figure 5 The shock absorbing device of the present invention explodes Figure 2 ; Figure 6 The chassis structure of the present invention is schematically shown in FIG. Figure 1 ; Figure 7 The chassis structure of the present invention is schematically shown in FIG. Figure 2 ; Figure 8 Schematic diagram of the development of the spiral shock-absorbing spring strip of the present invention; Figure 9 It is a schematic diagram of the spiral shock-absorbing spring strip of the present invention being collapsed.

[0016] Figure numerals: 1. top plate; 2. bottom plate; 21. arc-shaped guide groove; 22. transmission gear rod; 23. arc-shaped pressure strip; 24. aerial camera lens mounting plate; 3. adjustment plate; 31. adjustment gear; 32. linear slide; 33. limit bolt; 4. spiral shock-absorbing spring strip; 41. slider; 42. guide column; 5. connecting rod; 51. connecting clamp; 52. collar; 6. top block. DETAILED DESCRIPTION

[0017] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] Embodiment 1, as Figures 1-9As shown, a small UAV aerial photography shock absorption device comprises a top plate 1 and a bottom plate 2, the top plate 1 is fixedly mounted on the bottom of the UAV, a plurality of welding plates are arranged in an annular manner at the bottom of the top plate 1, a plurality of spiral shock absorbing spring strips 4 are welded to the bottom of the welding plates, the plurality of spiral shock absorbing spring strips 4 are distributed in an annular manner, a slider 41 is fixedly connected to the bottom of the spiral shock absorbing spring strips 4, and a guide column 42 is arranged at the bottom of the slider 41; The chassis 2 is located below the top plate 1, and the aerial photography lens is installed below the chassis 2. Multiple groups of adjustment disks 3 are rotatably installed on the top of the chassis 2. The adjustment disks 3 are arranged corresponding to the welding disks. Multiple groups of straight sliding openings 32 are provided inside the adjustment disks 3. Multiple groups of arc guide grooves 21 are provided on the top of the chassis 2. The slider 41 is slidably connected in the straight sliding opening 32. The guide column 42 is inserted in the arc guide groove 21, and the diameter of the guide column 42 is greater than the width of the straight sliding opening 32.

[0019] Furthermore, the top plate 1 is designed to be hollow inside, which makes it easier to install the shock absorbing device on the bottom of the drone while reducing the overall gravity of the device.

[0020] When in use, the shock absorbing device is installed at the bottom of the UAV, and then the drone is installed at the bottom of the shock absorber, so that the center of gravity of the drone corresponds to one of the groups of adjustment disks 3. The adjustment disk 3 is controlled to rotate according to the weight of the drone, and the adjustment disk 3 drives the slider 41 to rotate. At the same time, under the action of the arc guide groove 21 and the guide column 42, the slider 41 slides along the straight slide 32 to the inside of the adjustment disk 3. Since the top of the spiral shock-absorbing spring strip 4 is fixed, the bottom end will rotate and tighten, increasing the number of spiral turns of the spiral shock-absorbing spring strip 4. The damping strength at this position is increased, and the tension provided is more stable, so that the chassis 2 will not deviate to this direction. It should be noted that when the bottom end of the spiral shock-absorbing spring strip 4 is fully unfolded, the multiple groups of spiral shock-absorbing spring strips 4 are drum-shaped with a protrusion in the middle. This can provide a more stable shock-absorbing effect while giving the spiral shock-absorbing spring strip 4 a sufficient winding length. The bottom end of the spiral shock-absorbing spring strip 4 can be stably retracted and the number of spiral turns can be increased. At the same time, during the shooting process of the adjustment disk 3, as the drone lens rotates, the center of gravity of the drone also rotates. It is only necessary to retract the spiral shock-absorbing spring strips 4 in the corresponding direction to increase the shock-absorbing damping at the end where the center of gravity of the drone is offset, thereby preventing the chassis 2 from tilting in the direction of the center of gravity offset, thereby ensuring the overall stability of the drone and a good shock-absorbing effect.

[0021] Therefore, the shock absorbing device of the present invention is more suitable for shock absorbing of an aerial photography device with a shifted center of gravity.

[0022] In this embodiment, a total of 24 spiral shock-absorbing spring strips 4 are used. The material of a single spiral shock-absorbing spring strip 4: stainless steel (assuming Young's modulus E = 200 GPa), outer diameter of the spring: 20 mm, wire diameter: 2 mm, pitch: 5 mm, length: 50 mm, load: 1 kg (about 9.81 N). The general maximum weight of a professional-grade aerial drone is 10 kg, which is sufficient for shock absorption and load bearing based on aerial photography lenses.

[0023] Embodiment 2, on the basis of the above embodiment, further includes a connecting rod 5 fixedly installed on the aerial photography lens. A top block 6 is fixedly installed at the top of the connecting rod 5. A plurality of driving tooth rods 22 are slidably connected to the bottom of the chassis 2. The driving tooth rods 22 are correspondingly arranged with the adjusting disc 3. An arc-shaped pressing strip 23 is arranged on the outer side of the driving tooth rod 22. An adjusting gear 31 is fixedly connected to the bottom of the adjusting disc 3. The adjusting gear 31 meshes with the driving tooth rod 22. The top block 6 abuts against the arc-shaped pressing strip 23. The width of the top block 6 is greater than the distance between adjacent arc-shaped pressing strips 23. The arc-shaped pressing strips 23 are symmetrically designed with respect to the adjusting gear 31. The adjusting gear 31 and the adjusting disc 3 are on the same axis, that is, symmetrically designed with respect to the center of the adjusting disc 3.

[0024] Furthermore, the thickness of the top block 6 is greater than the thickness of the arc-shaped pressing strip 23, so that the top block 6 can more stably press the arc-shaped pressing strip 23.

[0025] During installation, the top block 6 is located on the reverse extension line from the center of gravity of the aerial drone to the rotation center of the aerial drone. Therefore, when the aerial drone lens rotates, it drives the connecting rod 5 to rotate. The connecting rod 5 drives the top block 6 to rotate. The top block 6 rotates synchronously with the lens and is always on the same side as the center of gravity. When the top block 6 rotates to the center position of the arc-shaped pressing strip 23, the bottom end of the spiral shock-absorbing spring strip 4 is in a retracted state at this time. As the lens rotates, the top block 6 rotates relative to the arc-shaped pressing strip 23. Since the arc-shaped pressing strips 23 are symmetrically designed with respect to the adjusting gear 31, when the top block 6 moves away from the center of the arc-shaped pressing strip 23, a distance will be formed between the top block 6 and the arc-shaped pressing strip 23. At this time, under the action of the elastic force of the spiral shock-absorbing spring strip 4, the spiral shock-absorbing spring strip 4 rotates back. The spiral shock-absorbing spring strip 4 drives the adjusting disc 3 to rotate back through the slider 41. The adjusting disc 3 drives the arc-shaped pressing strip 23 to press against the top block 6 through the adjusting gear 31 and the driving tooth rod 22. Therefore, the original position of the spiral shock-absorbing spring strip 4 is lowered. At the same time, the top block 6 contacts another group of arc-shaped pressing strips 23 in the rotation direction. The bottom end of the spiral shock-absorbing spring strip 4 corresponding to this arc-shaped pressing strip 23 is retracted, and the shock-absorbing damping increases. That is to say, when the lens rotates to the middle of the two adjusting discs 3, these two adjusting discs 3 share the gravity and the damping. Therefore, as the lens rotates, the shock-absorbing damping can be changed synchronously. The adjustment is simple, the structure is compact, and the flight load will not be increased too much.

[0026] Embodiment 3, on the basis of the above embodiments, further includes that a guide sleeve is provided at the bottom of the chassis 2, and a sliding column is provided at one end of the transmission rack 22 away from the arc-shaped pressing strip 23. The sliding column is slidably connected in the guide sleeve. Through this design, the transmission rack 22 can slide stably and will not cause transmission interference.

[0027] Embodiment 4, on the basis of the above embodiments, further includes that the connecting rod 5 is fixedly installed on the aerial photography lens through a connecting hoop 51. The connecting hoop 51 is composed of two semi-circular rings, and the two semi-circular rings are fixedly connected by bolts. Through this design, the connecting rod 5 can be fixedly installed on different models of aerial photography devices.

[0028] Further, support columns are provided at the bottom of the chassis 2. An aerial photography lens mounting plate 24 is installed at the bottom of the support columns. The aerial photography lens is installed at the bottom of the aerial photography lens mounting plate 24. A collar 52 is provided on the outer side of the connecting rod 5, and the collar 52 is rotatably installed on the support column.

[0029] Embodiment 5, on the basis of the above embodiments, further includes that a limit bolt 33 is threadedly connected to the outside of the linear sliding opening 32.

[0030] Through the design of the limit bolt 33, the maximum expansion angle of the bottom end of the spiral shock-absorbing spring strip 4 can be limited, and thus the initial elastic force of the spiral shock-absorbing spring strip 4 can be controlled, enabling the device to be applicable to aerial photography devices of different weights and having a wider application range.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A small UAV aerial photography shock absorption device, comprising a top plate (1) and a bottom plate (2), characterized in that, The top disk (1) is fixedly installed at the bottom of the drone. A plurality of welding disks are arranged in a ring at the bottom of the top disk (1). A plurality of spiral shock-absorbing elastic bars (4) are welded to the bottom of the welding disks. The bottom of the spiral shock-absorbing elastic bars (4) is fixedly connected to a slider (41). A guide post (42) is arranged at the bottom of the slider (41). The chassis (2) is located below the top disk (1). The aerial photography lens is installed below the chassis (2). A plurality of adjusting disks (3) are rotatably installed on the top of the chassis (2). The adjusting disks (3) are arranged corresponding to the welding disks. A plurality of linear sliding openings (32) are formed inside the adjusting disks (3). A plurality of arc-shaped guide grooves (21) are formed on the top of the chassis (2). The slider (41) is slidably connected in the linear sliding openings (32). The guide post (42) is inserted into the arc-shaped guide grooves (21), and the diameter of the guide post (42) is larger than the width of the linear sliding openings (32).

2. The shock-absorbing device for small UAV aerial photography according to claim 1, wherein, It further includes a connecting rod (5) fixedly installed on the aerial photography lens. A top block (6) is fixedly installed at the top of the connecting rod (5). A plurality of transmission toothed rods (22) are slidably connected to the bottom of the chassis (2). The transmission toothed rods (22) are arranged corresponding to the adjusting disks (3). An arc-shaped pressing strip (23) is arranged on the outer side of the transmission toothed rod (22). An adjusting gear (31) is fixedly connected to the bottom of the adjusting disk (3). The adjusting gear (31) is meshed with the transmission toothed rod (22). The width of the top block (6) is larger than the distance between adjacent arc-shaped pressing strips (23). The arc-shaped pressing strips (23) are symmetrically designed with respect to the adjusting gear (31).

3. The shock absorption device for small UAV aerial photography according to claim 2, characterized in that, A guide sleeve is arranged at the bottom of the chassis (2). A sliding column is arranged at one end of the transmission toothed rod (22) away from the arc-shaped pressing strip (23). The sliding column is slidably connected in the guide sleeve.

4. The small UAV aerial photography shock absorption device according to claim 3, characterized in that, The connecting rod (5) is fixedly installed on the aerial photography lens through a connecting clamp (51). The connecting clamp (51) is composed of two semi-circular rings. The two semi-circular rings are fixedly connected by bolts.

5. The aerial photography shock absorption device for a small unmanned aerial vehicle according to claim 4, characterized in that A support column is arranged at the bottom of the chassis (2). An aerial photography lens mounting plate (24) is installed at the bottom of the support column. The aerial photography lens is installed at the bottom of the aerial photography lens mounting plate (24). A collar (52) is arranged on the outer side of the connecting rod (5). The collar (52) is rotatably installed on the support column.

6. The small UAV aerial photography shock absorption device according to claim 5, characterized in that, The thickness of the top block (6) is larger than the thickness of the arc-shaped pressing strip (23).

7. A small UAV aerial photography shock-absorbing device according to claim 1, characterized in that, A limit bolt (33) is threadedly connected to the outer side of the linear sliding opening (32).

8. A small UAV aerial photography shock absorption device according to claim 1, characterized in that, The interior of the top disk (1) is designed to be hollow.

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