Ball cage type rotor unmanned aerial vehicle suitable for sports games

Abstract

The invention relates to the technical field of unmanned aerial vehicles, and discloses a spherical cage type rotor unmanned aerial vehicle suitable for sports games, the spherical cage type rotor unmanned aerial vehicle comprises an unmanned aerial vehicle body, four rotors are arranged at the top of the unmanned aerial vehicle body, and transmission rods are fixedly connected to the bottoms of the rotors; the transmission rod is in transmission connection with the output end of the unmanned aerial vehicle body through the torsion overload protector. The ball cage protection mechanism is fixedly arranged on the unmanned aerial vehicle body; by arranging the ball cage protection mechanism, the upper ball cage frame and the lower ball cage frame can be connected through the magnetic attraction mechanism to form a ball cage shape, when the unmanned aerial vehicle body collides with an obstacle, the ball cage part makes contact with the obstacle, and therefore the rotor wings are prevented from making direct contact with the obstacle, and meanwhile when the ball cage makes contact with the obstacle, the rotor wings are prevented from being damaged. The rubber buffer layer and the aluminum honeycomb crumple layer can play a role in buffering, the stability of the overall structure of the ball cage protection mechanism is improved, and then the effect of protecting the rotor wing part is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles, and particularly to a ball cage type rotor unmanned aerial vehicle suitable for sports games. Background Art

[0002] An unmanned aerial vehicle, abbreviated as "UAV", is an unpiloted aircraft controlled by a radio remote control device and a self - contained program control device, or is completely or intermittently autonomously operated by an on - board computer. Compared with a piloted aircraft, UAVs are often more suitable for tasks that are too "dull, dirty or dangerous". With the progress of the times, UAVs are also used in some sports games.

[0003] After retrieval, as disclosed in the Chinese patent document, a control system composed of a ball cage universal joint and an oil - powered three - rotor UAV [Publication No.: CN210942237U]. It includes a control system, a tail rotor system, a frame system, a power system, and a transmission system; three arm tubes are arranged on the same plane around the frame, one arm tube is arranged facing the nose of the aircraft, and the other two arm tubes are symmetrically arranged with the longitudinal vertical section of the center of the frame as the reference; the control system is installed at the end of the arm tube of the frame system through a universal joint drive shaft seat; the tail rotor system is installed at the end of the tail rotor arm tube of the frame system through a tail rotor shaft seat; the power system and the transmission system are both fixed on the frame system; the present utility model mainly solves the problems of a control system composed of an automatic swashplate, which has a complex structure and a high maintenance cost.

[0004] In some sports games participated by UAVs, most of them are to fly the UAV through some obstacles. During the game process, collisions are inevitable, especially for the rotor part. After a collision, it is extremely easy to be damaged, causing the UAV to fall, thereby affecting the normal use of the UAV. Summary of the Invention

[0005] The purpose of the present invention is to provide a ball cage type rotor unmanned aerial vehicle suitable for sports games, so as to solve the problems raised in the above - mentioned background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A ball cage type rotor unmanned aerial vehicle suitable for sports games, including a UAV body, four rotors are arranged on the top of the UAV body, a transmission rod is fixedly connected to the bottom of the rotor, and the transmission rod is in transmission connection with the output end of the UAV body through a torque overload protector;

[0007] A ball cage protection mechanism, which is fixedly arranged on the UAV body;

[0008] The constant velocity joint protection mechanism includes an upper constant velocity joint frame and a lower constant velocity joint frame. The connection between the lower constant velocity joint frame and the UAV body is fixedly connected through a support frame. Aluminum honeycomb crush layers are fixedly connected to the surfaces of both the upper constant velocity joint frame and the lower constant velocity joint frame. A rubber buffer layer is fixedly connected to the surface of the aluminum honeycomb crush layer. A magnetic attraction mechanism is provided at the connection between the upper constant velocity joint frame and the lower constant velocity joint frame.

[0009] Preferably, it further includes an inflation mechanism, which is fixedly arranged on the lower constant velocity joint frame;

[0010] The inflation mechanism includes an annular storage box fixedly connected to the surface of the lower constant velocity joint frame. An airbag is fixedly connected to the inner wall of the annular storage box. One end of the airbag passes through the opening of the annular storage box and extends to the top of the annular storage box. Both sides of the airbag are fixedly communicated with an air inlet pipe. One end of the air inlet pipe penetrates to the outside of the annular storage box. High-pressure gas cylinders for inflating the airbag are arranged on both sides of the annular storage box. The air outlet end of the high-pressure gas cylinder is fixedly communicated with a transmission pipe for cooperating with the air inlet pipe;

[0011] A solenoid valve is fixedly installed on the surface of the transmission pipe. Two acceleration sensors are symmetrically and fixedly connected to the inner wall of the lower constant velocity joint frame. The acceleration sensors are signal-connected to the solenoid valve.

[0012] Preferably, it further includes a traction and guiding mechanism, which is fixedly arranged on the top of the airbag;

[0013] The traction and guiding mechanism includes four traction blocks fixedly connected to the top of the airbag. A guiding block is fixedly connected to one side of the traction block. The upper constant velocity joint frame and the lower constant velocity joint frame are both provided with guiding grooves. Sliding wheels are rotatably connected to both sides of the guiding block through a first rotating shaft. Sliding grooves for cooperating with the sliding wheels are provided on the inner wall of the guiding groove.

[0014] Preferably, it further includes the locking mechanism, which is fixedly arranged on the inner wall of the lower constant velocity joint frame;

[0015] The locking mechanism includes four shells fixedly connected to the inner wall of the lower constant velocity joint frame. A spring is fixedly connected inside the shell. One end of the spring is fixedly connected to a moving block. A locking rod is fixedly connected to one side of the moving block. One end of the locking rod penetrates into the guiding groove and contacts one side of the guiding block. A transmission block is fixedly connected to the top of the moving block;

[0016] A U-shaped frame is sleeved on the surface of the transmission rod. The connection between the U-shaped frame and the transmission block is connected by a traction belt. A plurality of teeth are fixedly connected to the inner wall of the U-shaped frame. A sleeve is arranged on one side of the U-shaped frame. The connection between the sleeve and the UAV body is fixedly connected by a connecting block. A telescopic rod is slidably connected to the inner wall of the sleeve. One end of the telescopic rod is fixedly connected to one side of the U-shaped frame.

[0017] Preferably, the magnetic attraction mechanism includes a magnetic attraction buckle fixedly connected to the bottom of the upper ball cage frame. A clamping groove for cooperating with the magnetic attraction buckle is formed at the top of the lower ball cage frame. A magnetic attraction block for cooperating with the magnetic attraction buckle is fixedly connected to the inner wall of the clamping groove.

[0018] Preferably, the number of the magnetic attraction buckles is several and they are evenly distributed in a ring at the bottom of the upper ball cage frame.

[0019] Preferably, a rubber ring is fixedly connected to the surface of the transmission rod, and the position of the rubber ring is opposite to that of the teeth.

[0020] Preferably, a first guide frame is fixedly connected to the top of the housing. A first guide wheel is rotatably connected to the inner wall of the first guide frame through a second rotating shaft. Four second guide frames are fixedly connected to the top of the UAV body. A second guide wheel is rotatably connected to the inner wall of the second guide frame through a third rotating shaft. The first guide wheel and the second guide wheel can guide the traction belt.

[0021] Preferably, an external thread is provided on the surface of the transmission pipe, and an internal thread for cooperating with the external thread is provided on the inner wall of the air inlet pipe.

[0022] Preferably, the airbag is made of aramid fiber reinforced rubber material and covers an area > 70% of the surface of the ball cage.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. In the present invention, by setting the ball cage protection mechanism, the upper ball cage frame and the lower ball cage frame can be connected by the magnetic attraction mechanism to form a ball cage shape. When the UAV body hits an obstacle, the ball cage part will contact the obstacle, so as to avoid the direct contact between the rotor and the obstacle. At the same time, when the ball cage contacts the obstacle, the rubber buffer layer and the aluminum honeycomb collapse layer can play a buffering role, and the stability of the overall structure of the ball cage protection mechanism is improved, so as to achieve the protection effect on the rotor part;

[0025] 2. In the present invention, by setting the magnetic attraction mechanism, when the upper ball cage frame and the lower ball cage frame are connected, by aligning the positions of the magnetic attraction buckle and the clamping groove, pushing the upper ball cage frame downward to make the magnetic attraction buckle enter the corresponding clamping groove, and at the same time, the magnetic attraction buckle and the magnetic attraction block will fix the upper ball cage frame and the lower ball cage frame according to the principle of magnetic attraction between opposite poles of magnets;

[0026] 3. In the present invention, by providing an inflation mechanism, when the UAV body hits an obstacle and falls downward, the acceleration sensor will receive a signal of accelerating downward. At the same time, the solenoid valve is activated, and the gas in the high-pressure gas tank will enter the intake pipe through the transmission pipe, and then enter the airbag through the intake pipe to inflate the airbag. After the airbag is inflated, it will fully expand and cover an area > 70% of the surface of the ball cage. When the UAV body falls, the airbag will contact the ground and play a role in buffering and protecting, thereby preventing the UAV body and the rotor from being damaged due to the fall.

[0027] 4. In the present invention, by providing a traction and guiding mechanism, while the airbag is inflating, the force of the expanding airbag will push the traction block and the guiding block to slide spherically along the trajectory of the guiding groove. Under the guidance of the traction block, finally the airbag will wrap around the surface of the ball cage structure, playing a role in guiding and orienting the airbag. At the same time, the sliding wheel and the sliding groove change the sliding mode into a rolling form, which can reduce friction and improve the smooth movement of the traction block and the guiding block.

[0028] 5. In the present invention, by providing a locking mechanism, when the thrust of the airbag drives the traction block and the guiding block to move along the trajectory of the guiding groove, without the restriction of the guiding block, the elastic force generated by the spring will push the moving block and the locking rod to move away from the spring side. The transmission block will move synchronously with the moving block and at the same time pull the traction belt to move. The traction block will drive the U-shaped frame to move horizontally under the restriction of the telescopic rod and the sleeve, so that the tooth of the card contacts the surface of the transmission rod. At this time, the torque required for the transmission rod to rotate is greater than that of the torque overload protector, and the torque overload protector will disconnect the transmission rod from the output end of the UAV body, thereby stopping the rotation of the transmission rod and the rotor, and avoiding the situation of secondary damage when the rotor falls while rotating. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the main structure in the present invention;

[0030] Figure 2 It is a schematic diagram of the side section of the main structure of the present invention

[0031] Figure 3 It is the present invention Figure 2 The partial enlarged view at A in the present invention;

[0032] Figure 4 It is a schematic diagram of the airbag after inflation in the present invention;

[0033] Figure 5 It is a schematic diagram of the decomposition of the upper ball cage frame and the lower ball cage frame of the present invention;

[0034] Figure 6 It is the present invention Figure 5A partial enlarged view of point B in the middle;

[0035] Figure 7 A perspective view of a top-down section of the main structure of the present invention;

[0036] Figure 8 A three-dimensional diagram of a partial structure of the locking mechanism of the present invention;

[0037] Figure 9 A perspective view of a side section of the housing of the present invention;

[0038] Figure 10 A three-dimensional diagram of a partial structure of the traction guide mechanism of the present invention;

[0039] Figure 11 This is a schematic diagram of a disassembled high-pressure gas tank of the present invention;

[0040] Figure 12 It is a schematic diagram of a cross-section of the upper cage frame of the present invention.

[0041] Figure: 1. UAV body; 2. Rotor; 3. Transmission rod; 4. Torque overload protector; 5. Upper cage frame; 6. Lower cage frame; 7. Support frame; 8. Aluminum honeycomb collapse layer; 9. Rubber buffer layer; 10. Ring storage box; 11. Airbag; 12. Inlet pipe; 13. High-pressure gas tank; 14. Transmission pipe; 15. Solenoid valve; 16. Accelerometer; 17. Traction block; 18. Guide block; 19. Guide groove; 20. Sliding wheel; 21 , sliding groove; 22, housing; 23, spring; 24, moving block; 25, locking rod; 26, transmission block; 27, U-shaped frame; 28, traction belt; 29, tooth; 30, sleeve; 31, connecting block; 32, telescopic rod; 33, magnetic buckle; 34, slot; 35, magnetic block; 36, rubber ring; 37, first guide frame; 38, first guide wheel; 39, second guide frame; 40, second guide wheel; 41, external thread; 42, internal thread. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1 - Figure 12 As shown,

[0044] Embodiment 1:

[0045] A ball cage rotor drone suitable for sports games includes a drone body 1, with four rotors 2 provided on the top of the drone body 1. A transmission rod 3 is fixedly connected to the bottom of the rotor 2. The transmission rod 3 is transmission-connected to the output end of the drone body 1 through a torsional overload protector 4.

[0046] The ball cage protection mechanism is fixedly arranged on the drone body 1;

[0047] The ball cage protection mechanism includes an upper ball cage frame 5 and a lower ball cage frame 6. The lower ball cage frame 6 is fixedly connected to the drone body 1 through a support frame 7. The surfaces of the upper ball cage frame 5 and the lower ball cage frame 6 are fixedly connected with an aluminum honeycomb collapse layer 8. The surface of the aluminum honeycomb collapse layer 8 is fixedly connected with a rubber buffer layer 9. A magnetic attraction mechanism is provided at the connection between the upper ball cage frame 5 and the lower ball cage frame 6.

[0048] In this embodiment, it is taken into account that some sports games in which drones participate are mostly played by driving the drone body 1 through some obstacles. Bumps are inevitable during the game, especially the rotor 2 part, which is extremely easy to be damaged after a collision. Therefore, by setting a ball cage protection mechanism, the upper ball cage frame 5 and the lower ball cage frame 6 can be connected by a magnetic mechanism to form a ball cage shape. When the drone body 1 hits an obstacle, the ball cage part will contact the obstacle, thereby avoiding direct contact between the rotor 2 and the obstacle. At the same time, when the ball cage contacts the obstacle, the rubber buffer layer 9 and the aluminum honeycomb collapse layer 8 can play a buffering role, and the stability of the overall structure of the ball cage protection mechanism can achieve the role of protecting the rotor 2 part.

[0049] The magnetic mechanism includes a magnetic buckle 33 fixedly connected to the bottom of the upper cage frame 5, and a slot 34 for use with the magnetic buckle 33 is opened on the top of the lower cage frame 6. The inner wall of the slot 34 is fixedly connected to a magnetic block 35 for use with the magnetic buckle 33.

[0050] In this embodiment, a magnetic mechanism is provided, so that when the upper ball cage frame 5 and the lower ball cage frame 6 are connected, the upper ball cage frame 5 can be pushed downward by aligning the positions of the magnetic buckle 33 and the slot 34 so that the magnetic buckle 33 enters the corresponding slot 34. At the same time, the magnetic buckle 33 and the magnetic block 35 fix the upper ball cage frame 5 and the lower ball cage frame 6 through the principle of attraction between opposite poles of magnets.

[0051] There are a plurality of magnetic buckles 33 , which are evenly distributed in a ring shape at the bottom of the upper cage frame 5 .

[0052] In this embodiment, by providing a magnetic buckle 33, a plurality of magnetic buckles 33 arranged in a ring shape can be attracted to the magnetic block 35, which can effectively improve the stability of the upper ball cage frame 5 and the lower ball cage frame 6 after being connected.

[0053] Embodiment 2:

[0054] On the basis of Embodiment 1, in this embodiment, the constant velocity joint protection mechanism can protect the UAV body 1 and prevent the rotor 2 from hitting obstacles and being damaged. However, considering that the UAV may fall from a high altitude after being hit, which will also cause damage to the UAV body 1 and the rotor 2, an inflation mechanism is further included in this application, and the inflation mechanism is fixedly arranged on the lower constant velocity joint frame 6;

[0055] The inflation mechanism includes an annular storage box 10 fixedly connected to the surface of the lower constant velocity joint frame 6. An airbag 11 is fixedly connected to the inner wall of the annular storage box 10. One end of the airbag 11 passes through the opening of the annular storage box 10 and extends to the top of the annular storage box 10. Both sides of the airbag 11 are fixedly communicated with an air inlet pipe 12. One end of the air inlet pipe 12 penetrates to the outside of the annular storage box 10. High-pressure gas cylinders 13 for inflating the airbag 11 are arranged on both sides of the annular storage box 10. The air outlet end of the high-pressure gas cylinder 13 is fixedly communicated with a transmission pipe 14 used in cooperation with the air inlet pipe 12;

[0056] A solenoid valve 15 is fixedly installed on the surface of the transmission pipe 14. Two acceleration sensors 16 are symmetrically and fixedly connected to the inner wall of the lower constant velocity joint frame 6. The acceleration sensors 16 are signal-connected to the solenoid valve 15.

[0057] In this embodiment, by setting the inflation mechanism, when the UAV body 1 hits an obstacle and falls downward, at this time, the acceleration sensors 16 will receive the signal of accelerating downward. At the same time, the solenoid valve 15 is activated, and the gas in the high-pressure gas cylinder 13 will enter the air inlet pipe 12 through the transmission pipe 14, and then enter the airbag 11 through the air inlet pipe 12 to inflate the airbag 11. After the airbag 11 is inflated, it will fully expand, as Figure 4 shown, covering an area of more than 70% of the constant velocity joint surface. When the UAV body 1 falls, the airbag 11 will contact the ground and play a role of buffering and protection, thereby preventing the UAV body 1 and the rotor 2 from being damaged due to the fall;

[0058] It should be noted that the gas in the high-pressure gas cylinder 13 only needs to be able to quickly inflate the airbag 11;

[0059] At the same time, the specific cooperation between the acceleration sensors 16 and the solenoid valve 15 is as follows: after the acceleration sensors 16 receive the signal of accelerating downward, the signal is transmitted to the controller, and the PLC module built into the controller will activate the solenoid valve 15 to open. The specific working principle of the controller is well-known common sense to those skilled in the art and will not be elaborated in this text.

[0060] External threads 41 are provided on the surface of the transmission pipe 14, and internal threads 42 for cooperating with the external threads 41 are provided on the inner wall of the air inlet pipe 12.

[0061] In this embodiment, by providing an external thread 41 and an internal thread 42, the high-pressure gas cylinder 13 is a disposable item. After use, the high-pressure gas cylinder 13 can be rotated counterclockwise to drive the transfer pipe 14 to rotate away from the inside of the intake pipe 12 to complete the disassembly. When installing, take out a new high-pressure gas cylinder 13, align it with the positions of the transfer pipe 14 and the intake pipe 12, and rotate the high-pressure gas cylinder 13 clockwise to complete the replacement of the high-pressure gas cylinder 13.

[0062] It should be noted that when the transfer pipe 14 is separated from the intake pipe 12, the gas in the airbag 11 will be discharged from the intake pipe 12. At this time, the airbag 11 can be inserted into the annular storage box 10 through the opening to complete the recycling of the airbag 11 for subsequent reuse.

[0063] The airbag 11 is made of aramid fiber-reinforced rubber material, and the coverage area is > 70% of the surface of the ball cage.

[0064] In this embodiment, by providing the airbag 11, by setting the material of the airbag 11 to aramid fiber-reinforced rubber material, the airbag 11 has better stretchability, which is convenient for the airbag 11 to expand quickly, and is also beneficial to the subsequent storage of the airbag 11.

[0065] Embodiment Three:

[0066] On the basis of Embodiment Two, in this embodiment, the inflation mechanism inflates the airbag 11, and then when the UAV body 1 drops, the airbag 11 will play a buffering role to protect the UAV. However, considering that if the airbag 11 cannot cover the surface of the ball cage structure in a spherical shape after inflation, there is still a risk of damage when the UAV body 1 drops. It also includes a guiding mechanism, which is fixedly arranged on the top of the airbag 11.

[0067] The guiding mechanism includes four traction blocks 17 fixedly connected to the top of the airbag 11. One side of the traction block 17 is fixedly connected with a guiding block 18. The upper ball cage frame 5 and the lower ball cage frame 6 are both provided with guiding grooves 19. Both sides of the guiding block 18 are rotatably connected with sliding wheels 20 through first rotating shafts. The inner wall of the guiding groove 19 is provided with sliding grooves 21 for the sliding wheels 20 to cooperate with.

[0068] In this embodiment, by providing the guiding mechanism, when the airbag 11 is inflated, the expanding force of the airbag 11 will push the traction blocks 17 and the guiding blocks 18 to slide in a spherical shape along the track of the guiding groove 19. Under the guidance of the traction blocks 17, finally the airbag 11 will Figure 4 As shown, wrap around the surface of the ball cage structure, playing a role of guiding and orienting the airbag 11. At the same time, the sliding wheels 20 and the sliding grooves 21 change the sliding mode into a rolling form, which can reduce friction and improve the smoothness of the movement of the traction blocks 17 and the guiding blocks 18.

[0069] Embodiment 4:

[0070] On the basis of the second embodiment, the inflation mechanism in this embodiment inflates the airbag 11, and then the airbag 11 will play a cushioning role when the drone body 1 falls, thereby protecting the drone. However, if the rotor 2 is still in a rotating state during the falling process, it is very likely to cause secondary damage. The present application also includes a locking mechanism, which is fixedly arranged on the inner wall of the lower cage frame 6;

[0071] The locking mechanism includes four housings 22 fixedly connected to the inner wall of the lower cage frame 6. A spring 23 is fixedly connected to the interior of the housing 22. One end of the spring 23 is fixedly connected to a moving block 24. One side of the moving block 24 is fixedly connected to a locking rod 25. One end of the locking rod 25 extends into the interior of the guide groove 19 and contacts one side of the guide block 18. The top of the moving block 24 is fixedly connected to a transmission block 26.

[0072] A U-shaped frame 27 is sleeved on the surface of the transmission rod 3. The U-shaped frame 27 is connected to the transmission block 26 through a traction belt 28. A plurality of latch teeth 29 are fixedly connected to the inner wall of the U-shaped frame 27. A sleeve 30 is provided on one side of the U-shaped frame 27. The sleeve 30 is fixedly connected to the drone body 1 through a connecting block 31. A telescopic rod 32 is slidably connected to the inner wall of the sleeve 30. One end of the telescopic rod 32 is fixedly connected to one side of the U-shaped frame 27.

[0073] In this embodiment, a locking mechanism is provided, so that when the thrust of the airbag 11 drives the traction block 17 and the guide block 18 to move along the trajectory of the guide groove 19, without the restriction of the guide block 18, the elastic force generated by the spring 23 will push the moving block 24 and the locking rod 25 to the side away from the spring 23, and the transmission block 26 will move synchronously with the moving block 24, while pulling the traction belt 28 to move, and the traction block 17 will drive the U-shaped frame 27 to move horizontally under the restriction of the telescopic rod 32 and the sleeve 30, so that the latching tooth 29 contacts the surface of the transmission rod 3. At this time, the torque required for the rotation of the transmission rod 3 will be greater than the torsional overload protector 4, and the torsional overload protector 4 will disconnect the transmission rod 3 from the output end of the drone body 1, thereby stopping the rotation of the transmission rod 3 and the rotor 2, and preventing the rotor 2 from falling in the rotating state and causing secondary damage;

[0074] It should be noted that the locking rod 25 rests on the guide block 18 and can also limit the traction block 17 and the guide block 18, so that the traction block 17 and the guide block 18 can only move when the airbag 11 is inflated. At the same time, the locking rod 25 will not affect the normal inflation of the airbag 11.

[0075] A rubber ring 36 is fixedly connected to the surface of the transmission rod 3 , and the rubber ring 36 is opposite to the latching teeth 29 .

[0076] In this embodiment, by setting the rubber ring 36, when the engaging teeth 29 contact the transmission rod 3, the engaging teeth 29 will embed into the inside of the rubber ring 36, thereby further increasing the contact friction force, so that the transmission rod 3 can quickly stop rotating.

[0077] The top of the housing 22 is fixedly connected with a first guide frame 37. The inner wall of the first guide frame 37 is rotatably connected with a first guide wheel 38 through a second rotating shaft. The top of the UAV body 1 is fixedly connected with four second guide frames 39. The inner wall of the second guide frame 39 is rotatably connected with a second guide wheel 40 through a third rotating shaft. The first guide wheel 38 and the second guide wheel 40 can guide the traction belt 28.

[0078] In this embodiment, by setting the first guide frame 37, the first guide wheel 38, the second guide frame 39 and the second guide wheel 40, the traction belt 28 can be guided, so that the traction belt 28 drives the U-shaped frame 27 to move more smoothly.

[0079] Working principle: The user connects the upper ball cage frame 5 and the lower ball cage frame 6 through a magnetic attraction mechanism to form a ball cage shape. When the UAV body 1 hits an obstacle, the ball cage part will contact the obstacle, so as to avoid the rotor 2 directly contacting the obstacle. At the same time, when the ball cage contacts the obstacle, the rubber buffer layer 9 and the aluminum honeycomb collapse layer 8 can play a buffering role, and the stability of the overall structure of the ball cage protection mechanism, so as to achieve the role of protecting the rotor 2 part;

[0080] When the UAV body 1 hits an obstacle and falls downward, at this time the acceleration sensor 16 will receive a signal of accelerating downward. At the same time, the solenoid valve 15 is started, and the gas in the high-pressure gas tank 13 will enter the intake pipe 12 through the transmission pipe 14, and then enter the airbag 11 through the intake pipe 12 to inflate the airbag 11. After the airbag 11 is inflated, it will be fully unfolded, as Figure 4 shown, the coverage area > 70% of the ball cage surface. When the UAV body 1 falls, the airbag 11 will contact the ground, playing a buffering and protecting role, so as to avoid damage to the UAV body 1 and the rotor 2 due to falling;

[0081] When the UAV body 1 hits an obstacle and falls downward, at this time the acceleration sensor 16 will receive a signal of accelerating downward. At the same time, the solenoid valve 15 is started, and the gas in the high-pressure gas tank 13 will enter the intake pipe 12 through the transmission pipe 14, and then enter the airbag 11 through the intake pipe 12 to inflate the airbag 11. After the airbag 11 is inflated, it will be fully unfolded, as Figure 4 shown, the coverage area > 70% of the ball cage surface. When the UAV body 1 falls, the airbag 11 will contact the ground, playing a buffering and protecting role, so as to avoid damage to the UAV body 1 and the rotor 2 due to falling;

[0082] While the airbag 11 is being inflated, the force of the expanding airbag 11 will push the traction block 17 and the guiding block 18 to slide spherically along the track of the guiding groove 19. Under the guidance of the traction block 17, finally the airbag 11 will be as Figure 4 shown, wrapped around the surface of the constant velocity joint structure, playing a role in guiding and pulling the airbag 11. At the same time, the sliding wheels 20 and the sliding grooves 21 change the sliding mode into a rolling form, which can reduce friction and improve the smooth movement of the traction block 17 and the guiding block 18;

[0083] When the thrust of the airbag 11 drives the traction block 17 and the guiding block 18 to move along the track of the guiding groove 19, without the restriction of the guiding block 18, the elastic force generated by the spring 23 will push the moving block 24 and the locking rod 25 to move to the side away from the spring 23. The transmission block 26 will move synchronously with the moving block 24, and at the same time pull the traction belt 28 to move. The traction block 17 will drive the U-shaped frame 27 to move horizontally under the restriction of the telescopic rod 32 and the sleeve 30, so that the cogs 29 are in contact with the surface of the transmission rod 3. At this time, the torque required for the transmission rod 3 to rotate will be greater than that of the torque overload protector 4, and the torque overload protector 4 will disconnect the transmission rod 3 from the output end of the UAV body 1, thereby stopping the rotation of the transmission rod 3 and the rotor 2, and avoiding the secondary damage that may occur when the rotor 2 falls while in a rotating state.

[0084] It should be noted that the UAV body 1, the torque overload protector 4, the high-pressure gas tank 13, the solenoid valve 15, and the acceleration sensor 16 are devices or equipment existing in the prior art, or devices or equipment that can be realized by the prior art. And the specific composition and principle of the power supply of the UAV body 1, the torque overload protector 4, the high-pressure gas tank 13, the solenoid valve 15, and the acceleration sensor 16 are clear to those skilled in the art, so they will not be elaborated in detail.

[0085] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0086] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball cage type rotor unmanned aerial vehicle applicable to sports games, comprising an unmanned aerial vehicle body (1), characterized in that: Four rotors (2) are arranged on the top of the UAV body (1). A transmission rod (3) is fixedly connected to the bottom of the rotor (2). The transmission rod (3) is in transmission connection with the output end of the UAV body (1) through a torsion overload protector (4). A constant velocity joint protection mechanism is fixedly arranged on the UAV body (1). The constant velocity joint protection mechanism comprises an upper constant velocity joint frame (5) and a lower constant velocity joint frame (6). The connection part between the lower constant velocity joint frame (6) and the UAV body (1) is fixedly connected through a support frame (7). Aluminum honeycomb crush layers (8) are fixedly connected to the surfaces of the upper constant velocity joint frame (5) and the lower constant velocity joint frame (6). A rubber buffer layer (9) is fixedly connected to the surface of the aluminum honeycomb crush layer (8). A magnetic attraction mechanism is arranged at the connection part between the upper constant velocity joint frame (5) and the lower constant velocity joint frame (6).

2. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 1, characterized in that: An inflation mechanism is further included, and the inflation mechanism is fixedly arranged on the lower constant velocity joint frame (6). The inflation mechanism comprises an annular storage box (10) fixedly connected to the surface of the lower constant velocity joint frame (6). An airbag (11) is fixedly connected to the inner wall of the annular storage box (10). One end of the airbag (11) passes through the opening of the annular storage box (10) and extends to the top of the annular storage box (10). Two air inlet pipes (12) are fixedly communicated with both sides of the airbag (11). One end of the air inlet pipe (12) penetrates to the outside of the annular storage box (10). High-pressure gas cylinders (13) for inflating the airbag (11) are arranged on both sides of the annular storage box (10). The air outlet end of the high-pressure gas cylinder (13) is fixedly communicated with a transmission pipe (14) which is matched with the air inlet pipe (12). A solenoid valve (15) is fixedly installed on the surface of the transmission pipe (14). Two acceleration sensors (16) are symmetrically and fixedly connected to the inner wall of the lower constant velocity joint frame (6). The acceleration sensor (16) is in signal connection with the solenoid valve (15).

3. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 2, characterized in that: A traction and guiding mechanism is further included, and the traction and guiding mechanism is fixedly arranged on the top of the airbag (11). The traction and guiding mechanism comprises four traction blocks (17) fixedly connected to the top of the airbag (11). A guiding block (18) is fixedly connected to one side of the traction block (17). Guide grooves (19) are formed in both the upper constant velocity joint frame (5) and the lower constant velocity joint frame (6). Sliding wheels (20) are rotatably connected to both sides of the guiding block (18) through a first rotating shaft. Sliding grooves (21) for cooperating with the sliding wheels (20) are formed in the inner wall of the guide groove (19).

4. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 3, wherein: A locking mechanism is further included, and the locking mechanism is fixedly arranged on the inner wall of the lower constant velocity joint frame (6). The locking mechanism comprises four shells (22) fixedly connected to the inner wall of the lower cage frame (6), a spring (23) fixedly connected to the interior of the shell (22), one end of the spring (23) fixedly connected to a moving block (24), one side of the moving block (24) fixedly connected to a locking rod (25), one end of the locking rod (25) passes through the interior of the guide groove (19) and contacts one side of the guide block (18), and the top of the moving block (24) fixedly connected to a transmission block (26); The surface of the transmission rod (3) is sleeved with a U-shaped frame (27), and the U-shaped frame (27) is connected to the transmission block (26) through a traction belt (28). The inner wall of the U-shaped frame (27) is fixedly connected with a plurality of latch teeth (29). A sleeve (30) is provided on one side of the U-shaped frame (27), and the sleeve (30) is fixedly connected to the drone body (1) through a connecting block (31). The inner wall of the sleeve (30) is slidably connected with a telescopic rod (32), and one end of the telescopic rod (32) is fixedly connected to one side of the U-shaped frame (27).

5. A ball cage type rotor UAV applicable to sports games according to claim 1, characterized in that: The magnetic attraction mechanism comprises a magnetic buckle (33) fixedly connected to the bottom of the upper cage frame (5); a slot (34) for use with the magnetic buckle (33) is provided on the top of the lower cage frame (6); and a magnetic block (35) for use with the magnetic buckle (33) is fixedly connected to the inner wall of the slot (34).

6. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 5, wherein: The number of the magnetic buckles (33) is several and they are evenly distributed in a ring shape at the bottom of the upper cage frame (5).

7. A ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 4, characterized in that: A rubber ring (36) is fixedly connected to the surface of the transmission rod (3), and the rubber ring (36) is opposite to the position of the latching tooth (29).

8. A ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 4, characterized in that: The top of the shell (22) is fixedly connected to a first guide frame (37), and the inner wall of the first guide frame (37) is rotatably connected to a first guide wheel (38) via a second rotating shaft. The top of the drone body (1) is fixedly connected to four second guide frames (39), and the inner wall of the second guide frame (39) is rotatably connected to a second guide wheel (40) via a third rotating shaft. The first guide wheel (38) and the second guide wheel (40) can guide the traction belt (28).

9. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 2, wherein: The surface of the transmission pipe (14) is provided with an external thread (41), and the inner wall of the air inlet pipe (12) is provided with an internal thread (42) used in conjunction with the external thread (41).

10. The ball cage type rotor unmanned aerial vehicle applicable to sports games according to claim 2, characterized in that: The airbag (11) is made of aramid fiber reinforced rubber material, and covers an area greater than 70% of the cage surface.

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