A small drone crash net recovery device

Abstract

The present invention relates to a small UAV collision net recovery device in the field of UAV technology, comprising: an arresting net for arresting UAVs; a retractable frame that can be adjusted up and down and is used to install the arresting net; a fixed chassis, including a damping cylinder that is set as a liquid sealing structure and filled with damping liquid; and a rotating shaft; wherein the rotating shaft passes through the damping cylinder horizontally and exposes its two shaft ends, and the part of the rotating shaft in the inner cavity of the damping cylinder is provided with damping blades, the lower part of the retractable frame is equipped with two shaft ends of the rotating shaft and rotates and tilts backward around the axis of the rotating shaft after the UAV hits the arresting net, and the retractable frame is set upright before the UAV hits the arresting net. It can buffer the impact force generated when the UAV is recovered, effectively protect the UAV, and has a simple structure and flexible operation.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicles, in particular to a recovery device for a small unmanned aerial vehicle. Background Art

[0002] In order to adapt to special terrain conditions, modern civilian UAVs adopt many recovery methods, mainly including parachute recovery, net recovery and landing roll. Among them, the net recovery method is suitable for UAVs in narrow recovery sites or on ships. It is an ideal precise point recovery method. Its principle is to control the UAV to hit the arresting net at a fixed point when the UAV returns, so as to recover the UAV. Its disadvantage is that the impact force of hitting the net is large, which can easily cause certain damage to the UAV. Summary of the invention

[0003] The purpose of the present invention is to provide a small UAV net-collision recovery device, which can buffer the impact force generated when the UAV is recovered, effectively protect the UAV, and has a simple structure and flexible operation.

[0004] The object of the present invention is achieved in this way: a small UAV collision recovery device, comprising:

[0005] Barrier net, used to block drones;

[0006] The telescopic frame can be adjusted up and down to install the barrier net;

[0007] A fixed base frame includes a damping cylinder configured as a liquid-tight structure and filled with damping fluid; and

[0008] Axis of rotation;

[0009] Among them, the damping cylinder extends horizontally, the rotating shaft passes through the damping cylinder horizontally and exposes its two shaft ends, the part of the rotating shaft in the inner cavity of the damping cylinder is provided with damping blades, the lower part of the retractable frame is equipped with the two shaft ends of the rotating shaft and rotates and tilts backward around the axis of the rotating shaft after the UAV hits the blocking net, and the retractable frame is upright before the UAV hits the blocking net.

[0010] Furthermore, both axial ends of the damping cylinder are provided with end protrusions, each end protrusion has a movable notch, the movable notch is roughly V-shaped and has two limiting edges, the two limiting edges form an acute angle, and the lower part of the retractable frame rotates back and forth in the movable notches of the two end protrusions.

[0011] Furthermore, one of the limiting edges is vertically arranged and abuts against the front side of the retractable frame before the UAV hits the barrier net, and the other limiting edge is tilted backward and supports the rear side of the retractable frame after the UAV hits the barrier net.

[0012] Furthermore, the lower part of the telescopic frame has a pair of fitting holes which are respectively fitted on the two ends of the rotating shaft. The telescopic frame is equipped with a locking assembly. In the locked state, the telescopic frame can be locked with the rotating shaft through the locking assembly to transmit torque. In the unlocked state, the fitting holes rotate around the axis of the rotating shaft.

[0013] Furthermore, the locking assembly includes a locking pin, the lower part of the telescopic frame has a pair of locking grooves respectively connected to the two set holes, and both ends of the rotating shaft are provided with a plurality of shaft end slots opening toward the walls of the set holes, and all the shaft end slots of each shaft end of the rotating shaft are evenly distributed circumferentially around the axis of the rotating shaft. In the locked state, the locking pin is inserted into the locking groove and an shaft end slot opposite to the locking groove.

[0014] Furthermore, the damping cylinder is configured as a cylindrical structure and is arranged horizontally, and the rotating shaft is coaxially rotatably mounted on the damping cylinder.

[0015] Furthermore, the rotating shaft is equipped with a pair of sealed bearings that act as liquid seals. The two sealed bearings seal the two axial ends of the damping cylinder respectively. The rotating shaft is rotatably connected to the damping cylinder through the two sealed bearings. The inner ring of the sealed bearing is mounted on the rotating shaft, and the outer ring of the sealed bearing is against the inner circumferential wall of the damping cylinder.

[0016] Furthermore, the base frame also includes two fixed cushion blocks, which support the damping cylinder and are fixedly connected to the damping cylinder.

[0017] The beneficial effects of the present invention are:

[0018] 1) It can buffer the impact force generated when the drone is recovered, effectively protecting the drone. It has a simple structure and flexible operation. Before the drone hits the blocking net, the blocking net and the retractable frame are in an upright state. After the drone hits the blocking net, the impact force drives the retractable frame to rotate backward, and the rotating shaft drives the damping blade to rotate. Due to the viscosity of the damping fluid, the rotation of the damping blade is hindered, thereby achieving the purpose of absorbing the impact force of the drone, so that the drone has a buffering effect when it hits the blocking net, thereby achieving the purpose of protecting the drone. After the retractable frame and the blocking net tilt backward, the drone will fall due to its own gravity, so that the bottom of the drone is hung on the blocking net, thereby achieving the purpose of recovering the drone;

[0019] 2) It is convenient to restore the backward-leaning telescopic frame and the barrier net to their original upright positions. Just pull out the locking pin and then rotate the telescopic frame forward so that the front side of the telescopic frame abuts against the front limit edge of the movable notch, thereby completing the resetting operation of the telescopic frame and the barrier net;

[0020] 3) The drone can be recovered at a fixed point in a relatively small space without the need for a runway or landing pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the blocking side of the present invention.

[0022] Figure 2 It is a back stereoscopic schematic diagram of the present invention.

[0023] Figure 3 yes Figure 2 Enlarged view of part A in .

[0024] Figure 4 This is a schematic diagram of the drone's status before it hits the barrier net.

[0025] Figure 5 yes Figure 4 Enlarged view of part B in .

[0026] Figure 6 This is a schematic diagram of the state of the drone after it hits the barrier net.

[0027] Figure 7 It is a structural diagram of the rotating shaft.

[0028] Figure 8 yes Figure 1 CC section view in.

[0029] Fig. 9 yes Figure 7 Enlarged view of part D in .

[0030] In the figure, 1 is a retractable frame, 1a is a retractable part, 1b is a fixed part, 1c is a set hole, 1d is a locking groove, 2 is a base frame, 201 is a damping cylinder, 202 is an end protrusion, 202a is a movable notch, 202b is a limiting edge, 203 is a cushion block, 3 is a blocking net, 4 is a rotating shaft, 4a is a shaft end slot, 5 is a damping blade, 6 is a damping fluid, 7 is a sealed bearing, 8 is a locking pin, and 9 is a drone. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-9 The present invention is further illustrated with reference to the accompanying drawings and specific embodiments.

[0032] Combination Figure 1 , 2 , 4, and 6, a small UAV collision recovery device, comprising:

[0033] A blocking net 3, used to block the drone 9;

[0034] A retractable frame 1, which can be adjusted upward and downward, is used to install a barrier net 3;

[0035] The fixed base frame 2 includes a damping cylinder 201 which is a liquid-tight structure and filled with a damping liquid 6;

[0036] Rotation axis 4.

[0037] The damping fluid 6 is silicone oil or glycerin with good damping effect.

[0038] The above-mentioned barrier net 3 is a flexible net, and generally a fishing net of good quality is selected.

[0039] The damping cylinder 201 extends horizontally, and the rotating shaft 4 passes through the damping cylinder 201 horizontally and exposes its two shaft ends. Figure 7 , 8 As shown, the portion of the rotating shaft 4 in the inner cavity of the damping cylinder 201 is provided with a damping blade 5, as shown in FIG. Figure 4 , 6 As shown, the lower part of the retractable frame 1 is equipped with two ends of the rotating shaft 4 and rotates and tilts backward around the axis of the rotating shaft 4 after the UAV 9 hits the blocking net 3. The retractable frame 1 is upright before the UAV 9 hits the blocking net 3.

[0040] The above-mentioned retractable frame 1 has a fixed part 1b and a retractable part 1a. The retractable part 1a is located above the fixed part 1b and can be adjusted up and down based on the fixed part 1b. The tension of the barrier net 3 can be adjusted. The retractable adjustment method referred to here can be automatic or manual; a pneumatic cylinder or an electric cylinder can be selected to perform the retractable adjustment, and the retractable part 1a is movably inserted into the fixed part 1b, and the pneumatic cylinder or the electric cylinder drives the retractable part 1a to be movably adjusted; the retractable adjustment method can be other well-known means.

[0041] Combination Figure 3 , 5 As shown in Figures 7 and 9, both axial ends of the damping cylinder 201 are provided with end protrusions 202, each of which has a movable notch 202a, which is roughly V-shaped and has two limiting edges 202b. The two limiting edges 202b form an acute angle, and the lower part of the telescopic frame 1 can rotate back and forth in the movable notches 202a of the two end protrusions 202.

[0042] One of the limiting edges 202b is vertically arranged and abuts against the front side of the retractable frame 1 before the UAV 9 hits the blocking net 3, and the other limiting edge 202b is tilted backward and supports the rear side of the retractable frame 1 after the UAV 9 hits the blocking net 3.

[0043] The movable notch 202a can limit the front-to-back flipping angle of the telescopic frame 1. The angle formed by the two limiting edges 202b can be adjusted according to actual conditions. In this embodiment, such an angle is 45° to control the backward limit position of the telescopic frame 1.

[0044] like Figure 5 , 9As shown, the lower part of the telescopic frame 1 has a pair of fitting holes 1c for fitting the two ends of the rotating shaft 4 respectively. The telescopic frame 1 is equipped with a locking assembly. In the locked state, the telescopic frame 1 is locked with the rotating shaft 4 through the locking assembly to transmit torque. In the unlocked state, the fitting holes 1c rotate around the axis of the rotating shaft 4.

[0045] like Figure 5 As shown, the locking assembly includes a locking pin 8, and the lower part of the telescopic frame 1 has a pair of locking grooves 1d respectively connected to the two set holes 1c, and both ends of the rotating shaft 4 are provided with a plurality of shaft end slots 4a with openings facing the hole walls of the set holes 1c. All shaft end slots 4a of each shaft end of the rotating shaft 4 are uniformly distributed around the axis of the rotating shaft 4. In the locked state, the locking pin 8 is inserted into the locking groove 1d and an shaft end slot 4a opposite to the locking groove 1d.

[0046] The damping cylinder 201 is configured as a cylindrical structure and is arranged horizontally, and the rotating shaft 4 is coaxially rotatably mounted on the damping cylinder 201 .

[0047] like Figure 7 , 9 As shown, the rotating shaft 4 is equipped with a pair of sealed bearings 7 for liquid sealing. The two sealed bearings 7 seal the two axial ends of the damping cylinder 201 respectively. The rotating shaft 4 is rotatably connected to the damping cylinder 201 through the two sealed bearings 7. The inner ring of the sealed bearing 7 is mounted on the rotating shaft 4, and the outer ring of the sealed bearing 7 is against the inner circumferential wall of the damping cylinder 201.

[0048] The base frame 2 further comprises two fixedly arranged cushion blocks 203, which support the damping cylinder 201 and are fixedly connected to the damping cylinder 201. The cushion blocks 203 can be fixedly installed on the deck of the ship.

[0049] Combination Figure 4 , 6 As shown, before the UAV 9 hits the blocking net 3, the blocking net 3 and the retractable frame 1 are both in an upright state. After the UAV 9 hits the blocking net 3, the impact force drives the retractable frame 1 to rotate backward, and the rotating shaft 4 drives the damping blade 5 to rotate. Due to the viscosity of the damping fluid 6, the rotation of the damping blade 5 is hindered, thereby achieving the purpose of absorbing the impact force of the UAV 9, so that the UAV 9 has a buffering effect when hitting the blocking net 3, thereby achieving the purpose of protecting the UAV 9. After the retractable frame 1 and the blocking net 3 tilt backward, the UAV 9 will fall due to its own gravity, so that the bottom of the UAV 9 is hung on the blocking net 3, thereby achieving the purpose of recovering the UAV 9.

[0050] When resetting, just pull out the locking pin 8, and then rotate the telescopic frame 1 forward so that the front side of the telescopic frame 1 is against the front limiting edge 202b of the movable notch 202a, thereby completing the resetting operation of the telescopic frame 1 and the blocking net 3, and then insert the locking pin 8 so that the telescopic frame 1 is locked with the rotating shaft 4 through the locking pin 8 to transmit torque.

[0051] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.

Claims

1. A small UAV collision recovery device, characterized in that ,include: A blocking net (3) for blocking a drone (9); A retractable frame (1) can be adjusted upward and downward and is used to install a barrier net (3); A fixed base frame (2) comprises a damping cylinder (201) provided as a liquid-tight structure and filled with a damping liquid (6); and Axis of rotation (4); The damping cylinder (201) extends horizontally, the rotating shaft (4) passes through the damping cylinder (201) horizontally and exposes its two shaft ends, the portion of the rotating shaft (4) located in the inner cavity of the damping cylinder (201) is provided with a damping blade (5), the lower part of the retractable frame (1) is fitted with the two shaft ends of the rotating shaft (4) and rotates and tilts backward around the axis of the rotating shaft (4) after the drone (9) hits the blocking net (3), and the retractable frame (1) is arranged upright before the drone (9) hits the blocking net (3); The damping cylinder (201) is provided with end protrusions (202) at both axial ends, each end protrusion (202) has a movable notch (202a), the movable notch (202a) is V-shaped and has two limiting edges (202b), the two limiting edges (202b) form an acute angle, and the lower part of the telescopic frame (1) can rotate forward and backward in the movable notches (202a) of the two end protrusions (202); The damping cylinder (201) is configured as a cylindrical structure and is arranged horizontally, and the rotating shaft (4) is coaxially rotatably mounted with the damping cylinder (201); The base frame (2) further comprises two fixed cushion blocks (203), wherein the two cushion blocks (203) support the damping cylinder (201) and are fixedly connected to the damping cylinder (201).

2. The small UAV net collision recovery device according to claim 1 is characterized by: One of the limiting edges (202b) is arranged vertically and abuts against the front side of the telescopic frame (1) before the drone (9) hits the blocking net (3), and the other limiting edge (202b) is arranged tilted backwards and supports the rear side of the telescopic frame (1) after the drone (9) hits the blocking net (3).

3. The small UAV net collision recovery device according to claim 1 is characterized by: The lower part of the telescopic frame (1) has a pair of fitting holes (1c) for fitting the two ends of the rotating shaft (4) respectively. The telescopic frame (1) is equipped with a locking assembly. In the locked state, the telescopic frame (1) is locked with the rotating shaft (4) through the locking assembly to transmit torque. In the unlocked state, the fitting holes (1c) rotate around the axis of the rotating shaft (4).

4. The small UAV net collision recovery device according to claim 3 is characterized by: The locking assembly comprises a locking pin (8); the lower part of the telescopic frame (1) comprises a pair of locking grooves (1d) respectively connected to the two set holes (1c); the two ends of the rotating shaft (4) are provided with a plurality of shaft end slots (4a) with openings facing the hole walls of the set holes (1c); all the shaft end slots (4a) of each shaft end of the rotating shaft (4) are uniformly distributed circumferentially around the axis of the rotating shaft (4); in a locked state, the locking pin (8) is inserted into the locking groove (1d) and an shaft end slot (4a) directly opposite to the locking groove (1d).

5. The small UAV net collision recovery device according to claim 1 is characterized by: The rotating shaft (4) is equipped with a pair of sealing bearings (7) for liquid sealing. The two sealing bearings (7) respectively seal the two axial ends of the damping cylinder (201). The rotating shaft (4) is rotatably connected to the damping cylinder (201) via the two sealing bearings (7). The inner ring of the sealing bearing (7) is sleeved on the rotating shaft (4), and the outer ring of the sealing bearing (7) is against the inner circumferential wall of the damping cylinder (201).

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