Middle-sized rescue unmanned aerial vehicle air freight device
By designing a medium-sized rescue drone air cargo device, using components such as lift control boxes and motor controllers to reduce the air hover delivery of drones, the problem of insufficient distribution capabilities of medium-sized drones is solved, and rapid material delivery and safe landing are achieved.
Patent Information
- Application Number
- CN202422553106.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The cargo distribution model of the existing medium-sized drones is a single-line drop-off, resulting in low distribution capacity, unable to meet the needs of rapid delivery of remote rescue materials, and there is a problem of difficulty in landing drones.
Design a medium-sized rescue drone air cargo device, including lift control box, motor controller, drive motor, lift rope and range measurement sensor, to realize the air hover delivery drop of the drone, and accurately control the cargo drop through the motor controller and range measurement sensor.
It has realized the rapid delivery of materials for drones during rescue, reduced the difficulty of distributing materials for rescue personnel, improved the efficiency of distribution, and ensured the safe landing of drones and the rapid whereabouts of cargo.
Smart Images

Figure CN223148698U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of UAV rescue, in particular to an aerial cargo transportation device for a medium-sized rescue UAV. Background Art
[0002] Based on medium-sized and small UAVs, when conducting remote cargo delivery, a high-altitude lifting device for a cargo delivery box is required to enable the UAV to hover and lower the cargo, thereby supplementing the cargo delivery capacity of the medium-sized UAV and improving the layout. For remote material delivery in disaster areas, rapid floor delivery to support villages can reduce the difficulty of relief personnel in distributing materials. Moreover, during the delivery process, an aerial hovering and descending strategy is adopted, enabling more rapid distribution of relief supplies. Therefore, it can also offset problems such as the difficulty of the loaded UAV in landing and the rapid unloading of rescue items by the UAV. The current general cargo delivery mode of existing medium-sized UAVs is generally a single-line descending and throwing mode. Especially when using UAVs for remote rescue delivery, the UAV needs to descend, resulting in relatively low delivery capacity, which does not conform to the long-term strategy of medium-sized UAV remote cargo assistance. Content of the Utility Model
[0003] Therefore, the utility model provides an aerial cargo transportation device for a medium-sized rescue UAV to solve the above problems in the prior art.
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] According to the first aspect of the utility model, an aerial cargo transportation device for a medium-sized rescue UAV includes a battery body, a lifting control box seat frame, a lifting control box body, a motor controller, a motor shaft wheel, a motor shaft body, a lifting rope, a driving motor, a cargo compartment small door, a lifting cargo compartment, a ranging sensor, a UAV main body, a connecting body part, and a diversion wire;
[0006] The lower end of the UAV main body is connected to the lifting control box body through the lifting control box seat frame, and the lifting cargo compartment is arranged below the lifting control box body;
[0007] The motor controller is installed on the inner side surface of the lifting control box body, the battery body is installed inside the lifting control box seat frame, the battery body is electrically connected to the motor controller through the diversion wire, and the driving motor is arranged on the lateral side of the motor controller;
[0008] The motor shaft wheel is arranged on the inner side surface of the lifting control box body opposite to the position of the motor controller, the output shaft of the driving motor is connected to one end of the motor shaft body, and the other end of the motor shaft body is rotatably arranged on the side surface of the motor shaft wheel;
[0009] Two lifting ropes are wound around the motor shaft body.
[0010] A small cargo door is provided on the side of the lifting cargo bin.
[0011] The lower end of the UAV body is connected to the lifting control box seat through the connecting member.
[0012] A ranging sensor is provided on the bottom surface of the lifting cargo bin.
[0013] Further, a UAV parachute is included, and the UAV parachute is installed on the top of the UAV body.
[0014] Further, a motor bracket is included, and the driving motor is installed on the inner bottom surface of the lifting control box through the motor bracket.
[0015] Further, a ventilation net is included. A ventilation net is provided on the side of the lifting control box body, and the ventilation net is located on the side of the lifting control box body where the driving motor is provided.
[0016] Further, a first electric magnet, a small battery pack body, and a second electric magnet are included; the small battery pack body is installed on the bottom surface of the lifting control box body, the first electric magnet is installed at the lower end of the small battery pack body, and the second electric magnet is installed at a position on the top surface of the lifting cargo bin opposite to the first electric magnet.
[0017] Further, a leg fixing device and an aircraft leg are included. The leg fixing devices are respectively provided on both sides of the bottom surface of the lifting control box body, and each leg fixing device is installed with the outwardly inclined aircraft leg.
[0018] Further, a camera is included. The camera is provided beside the ranging sensor on the bottom surface of the lifting cargo bin.
[0019] Further, an electric control small battery pack is included. The electric control small battery pack is provided on the front surface of the lifting cargo bin, and the electric control small battery pack is electrically connected to the second electric magnet.
[0020] Further, a UAV hanging rope body, a bidirectional connection hook, and a bidirectional hook connection control box hook are included. The bidirectional connection hook is installed on the lower surface of the UAV body, the bidirectional hook connection control box hook is installed on the top surface of the lifting control box body, and the bidirectional connection hook and the bidirectional hook connection control box hook are connected through the UAV hanging rope body.
[0021] Further, it further includes a shaft intermediate convex joint body, the shaft intermediate convex joint body is installed in the middle of the motor shaft body, and the two lifting ropes are respectively located on both sides of the shaft intermediate convex joint body.
[0022] The utility model has the following advantages: effectively realizing the material transportation of the unmanned aerial vehicle during rescue, supplementing the cargo distribution capacity of medium-sized unmanned aerial vehicles, reducing the problem of difficult material distribution for rescue personnel, and adopting an aerial hovering distribution and descending strategy during the delivery process, so as to more quickly distribute rescue materials. Therefore, it can also offset the characteristics such as difficult landing of the carrying unmanned aerial vehicle and rapid unloading of rescue items of the unmanned aerial vehicle. Description of the Drawings
[0023] Figure 1 It is an overall structure diagram of a medium-sized rescue unmanned aerial vehicle air cargo device provided by some embodiments of the utility model.
[0024] Figure 2 It is a plan view of a lifting control box of a medium-sized rescue unmanned aerial vehicle air cargo device provided by some embodiments of the utility model.
[0025] Figure 3 It is a three-dimensional view of a lifting control box of a medium-sized rescue unmanned aerial vehicle air cargo device provided by some embodiments of the utility model.
[0026] Figure 4 It is a side view of a lifting cargo compartment of a medium-sized rescue unmanned aerial vehicle air cargo device provided by some embodiments of the utility model.
[0027] In the figure: 1. Battery body; 2. Lifting control box seat frame; 3. Lifting control box body; 4. Motor controller; 5. Motor frame; 6. Motor shaft wheel; 7. Motor shaft body; 8. Lifting rope; 9. Driving motor; 10. Ventilation net; 11. First electric magnet; 12. Aircraft landing gear; 13. Cargo compartment small door; 14. Lifting cargo compartment; 15. Distance measuring sensor; 16. Camera; 17. UAV main body; 18. Landing gear fixing device; 19. Connecting body part; 20. UAV parachute; 21. Small battery pack body; 22. Electric control small battery pack; 23. UAV hanging rope body; 24. Bidirectional connecting hook; 25. Shaft intermediate convex joint body; 26. Bidirectional hook connecting control box hook; 27. Conductive wire; 28. Second electric magnet. Detailed Embodiment
[0028] The following describes the implementation manners of the present utility model by specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0029] Embodiment 1
[0030] As Figures 1 to 4 shown, a medium-sized rescue UAV air cargo device in the first aspect embodiment of the present utility model includes a battery body 1, a lifting control box seat frame 2, a lifting control box body 3, a motor controller 4, a motor shaft wheel 6, a motor shaft body 7, a lifting rope 8, a driving motor 9, a cargo compartment small door 13, a lifting cargo compartment 14, a ranging sensor 15, a UAV main body 17, a connecting member 19, and a diversion wire 27; the lower end of the UAV main body 17 is connected to the lifting control box body 3 through the lifting control box seat frame 2, and a lifting cargo compartment 14 is arranged below the lifting control box body 3; a motor controller 4 is installed on the inner side surface of the lifting control box body 3, a battery body 1 is installed on the inner side of the lifting control box seat frame 2, the battery body 1 is electrically connected to the motor controller 4 through the diversion wire 27, and a driving motor 9 is arranged on the lateral side of the motor controller 4; a motor shaft wheel 6 is arranged on the inner side surface of the lifting control box body 3 opposite to the motor controller 4, the output shaft of the driving motor 9 is connected to one end of the motor shaft body 7, and the other end of the motor shaft body 7 is rotatably arranged on the side surface of the motor shaft wheel 6; two lifting ropes 8 are wound around the motor shaft body 7; a cargo compartment small door 13 is opened on the side surface of the lifting cargo compartment 14; the lower end of the UAV main body 17 is connected to the lifting control box seat frame 2 through the connecting member 19; a ranging sensor 15 is arranged on the bottom surface of the lifting cargo compartment 14.
[0031] In the above embodiments, it should be noted that the battery body 1 is the main component for supplying power to the lifting control box body 3, the drive motor 9, and the motor controller 4; the lifting control box seat frame 2 mainly connects and stabilizes the UAV body 17 and the lifting control box body 3, and is all the control components for the UAV to lift; the lifting control box body 3 is mainly the position where the motor components and the motor controller are placed; the motor controller 4 is the main component for giving the motor a remote control signal, and can realize the concept function of remotely controlling the lifting of the lifting device motor; the motor shaft wheel 6 is the carrier opposite to the drive motor 9, and is stable, reliable, quiet and reliable when the lifting rope 8 descends; the motor shaft body 7 is the main part of the mechanical composition, enabling the two-way lifting rope to descend stably during the control process; the lifting rope 8 mainly bears the technical barrier of the descending body and is the main docking component for completing the lifting of the cargo hold; the drive motor 9 is the main power source for the lifting control box, and can realize forward and reverse rotation during the lifting process, and safely and reliably presents the reduction of the risks of this technology; the small door 13 of the cargo hold is a mechanical type pick-up small door. When it lifts to a height of 0.2 - 0.5, the pick-up personnel can open the mechanical door to pick up the goods; the lifting cargo hold 14 is the main component for mainly placing goods, and the combination of the cargo holds is provided with heat preservation and heat insulation measures; the ranging sensor 15 drives the remote control drive motor to stop by sensing the distance range between 0.1 and 0.5; the UAV body 17 selects a medium-sized UAV structure body, and a quadcopter UAV can be selected; the connecting body part 19 is the main safety measure for connecting the UAV and the control box, improving the safety hazards; the diversion wire 27 is an insulating cable for the power supply safety structure that supplies power from the battery body to the drive motor 9.
[0032] The technical effects achieved by the above embodiments are as follows: effectively realizing the material transportation of the UAV during rescue, supplementing the cargo distribution capacity of the medium-sized UAV, reducing the problem of difficult material distribution for rescue personnel, and adopting an aerial hovering distribution and descending strategy during the delivery process, so as to more quickly distribute rescue materials. Therefore, it can also offset the problems such as the difficulty of the UAV landing and the rapid unloading of rescue items of the UAV.
[0033] Embodiment 2
[0034] As Figures 1 to 4 shown, a medium-sized rescue UAV aerial cargo transportation device includes all the contents of Embodiment 1. In addition, it further includes a UAV parachute 20, and the UAV parachute 20 is installed on the top of the UAV body 17.
[0035] The technical effects achieved by the above embodiments are as follows: The UAV parachute 20 is a safety measure for the UAV to prevent the UAV body from falling to the ground instantaneously and hitting people and buildings in case of an accident when the UAV carrier is in the air.
[0036] Embodiment 3
[0037] AsFigures 1 to 4 As shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 2. In addition, it further includes a motor mount 5, and the driving motor 9 is installed on the inner bottom surface of the lifting control box body 3 through the motor mount 5.
[0038] The technical effect achieved by the above embodiment is that the motor mount 5 mainly provides a carrier for the driving motor 9, and the driving motor 9 is stable and reliable.
[0039] Embodiment 4
[0040] As Figures 1 to 4 As shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 3. In addition, it further includes a ventilation net 10. A ventilation net 10 is provided on the side surface of the lifting control box body 3, and the ventilation net 10 is located on the side of the lifting control box body 3 where the driving motor 9 is provided.
[0041] The technical effect achieved by the above embodiment is that the ventilation net 10 mainly provides a ventilation and heat dissipation function for the lifting control box body 3, improving the maneuvering efficiency.
[0042] Embodiment 5
[0043] As Figures 1 to 4 As shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 4. In addition, it further includes a first electromagnet 11, a small battery pack body 21, and a second electromagnet 28; the small battery pack body 21 is installed on the bottom surface of the lifting control box body 3, the first electromagnet 11 is installed at the lower end of the small battery pack body 21, and the second electromagnet 28 is installed at the position on the top surface of the lifting cargo compartment 14 facing the first electromagnet 11.
[0044] During operation, when the second electromagnet 28 (cargo compartment connector) is closed, it completely engages with the first electromagnet 11, and separates from the first electromagnet 11 when starting to work to complete the cargo lowering work.
[0045] The technical effect achieved by the above embodiment is that the first electromagnet 11 calculates through the STM32 single-chip microcomputer brain. When the driving motor 9 and the lifting rope 8 are about to start working, they calculate and sense the principle of the first electromagnet controller that needs to be powered on and demagnetized through calculation, and the upper and lower electromagnets are disconnected, thereby driving the lifting rope 8 to descend in a planned manner; the small battery pack body 21 is mainly the main component that supplies power to the small-piece electromagnet.
[0046] Embodiment 6
[0047] As Figures 1 to 4As shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 5. In addition, it further includes a tripod fixing device 18 and an aircraft tripod 12. The two sides of the bottom surface of the lifting control box body 3 are respectively provided with the tripod fixing device 18, and each tripod fixing device 18 is installed with an aircraft tripod 12 that inclines outward.
[0048] The technical effects achieved by the above embodiment are as follows: The landing gear of the aircraft tripod 12 bears the overall UAV fuselage and the lifting control box, playing a role in safety and prevention; the tripod fixing device 18 mainly provides a fixing device for the landing tripod of the UAV to prevent UAV accident injuries caused by the detachment of the tripod.
[0049] Embodiment 7
[0050] As Figures 1 to 4 shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 6. In addition, it further includes a camera 16. A camera 16 is provided beside the distance measuring sensor 15 on the bottom surface of the lifting cargo compartment 14.
[0051] The technical effects achieved by the above embodiment are as follows: During the process of lowering the goods, the background personnel can clearly see all the situations on the ground through the camera 16.
[0052] Embodiment 8
[0053] As Figures 1 to 4 shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 7. In addition, it further includes an electric control small battery pack 22. An electric control small battery pack 22 is provided on the front surface of the lifting cargo compartment 14, and the electric control small battery pack 22 is electrically connected to the second electromagnet 28.
[0054] The technical effects achieved by the above embodiment are as follows: The electric control small battery pack 22 is the main component for supplying power to small parts, cameras, and distance measuring sensors.
[0055] Embodiment 9
[0056] As Figures 1 to 4 shown in the figure, a medium-sized rescue UAV air cargo device includes all the contents of Embodiment 8. In addition, it further includes a UAV hanging rope body 23, a bidirectional connection hook 24, and a bidirectional hook connection control box hook 26. A bidirectional connection hook 24 is installed on the lower surface of the UAV main body 17, and a bidirectional hook connection control box hook 26 is installed on the top surface of the lifting control box body 3. The bidirectional connection hook 24 and the bidirectional hook connection control box hook 26 are connected by a UAV hanging rope body 23; the small hook of the bidirectional connection hook 24 is cooperatively connected with the UAV hanging rope body 23.
[0057] The technical effects achieved by the above embodiments are as follows: The two-way hook connection control box hook 26 is connected to the two-way connection hook 24 relatively, and is connected to the drone hanging rope body 23, which increases the safety hazards during takeoff and landing.
[0058] Optionally, it further includes a shaft middle convex joint 25. The shaft middle convex joint 25 is installed in the middle of the motor shaft body 7, and the two lifting ropes 8 are respectively located on both sides of the shaft middle convex joint 25; the drone hanging rope body 23 is connected to the control box by a safety rope, which is a safety measure for the drone box to lift and control the box, and further increases the safety hazards of the drone lifting control box connection body.
[0059] The technical effects achieved by the above embodiments are as follows: The shaft middle convex joint 25 is to prevent the lifting ropes on both sides from being twisted during the descent and contraction of the descending rope in the lifting control box, so the middle shaft convex measure is proposed to prevent problems from interfering with the descent accuracy, etc.
[0060] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.
[0061] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0063] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0064] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
[0065] In the description of this specification, the descriptions referring to terms such as "Embodiment 1", "Embodiment 2", "example", "specific example", or "some examples", etc. mean that the specific methods, devices, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, methods, devices, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0066] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A medium-sized rescue UAV air cargo device, characterized in that, It includes a battery body (1), a lifting control box seat frame (2), a lifting control box body (3), a motor controller (4), a motor shaft pulley (6), a motor shaft body (7), a lifting rope (8), a driving motor (9), a small door of the cargo compartment (13), a lifting cargo compartment (14), a ranging sensor (15), a drone body (17), a connecting body part (19), and a diversion wire (27); The lower end of the drone body (17) is connected to the lifting control box body (3) through the lifting control box seat frame (2), and the lifting cargo compartment (14) is arranged below the lifting control box body (3); The motor controller (4) is installed on the inner side surface of the lifting control box body (3), the battery body (1) is installed on the inner side of the lifting control box seat frame (2), the battery body (1) is electrically connected to the motor controller (4) through the diversion wire (27), and the driving motor (9) is arranged on the lateral side surface of the motor controller (4); The motor shaft pulley (6) is arranged on the inner side surface of the lifting control box body (3) opposite to the position of the motor controller (4), the output shaft of the driving motor (9) is connected to one end of the motor shaft body (7), and the other end of the motor shaft body (7) is rotatably arranged on the side surface of the motor shaft pulley (6); Two of the lifting ropes (8) are wound around the motor shaft body (7); The small door of the cargo compartment (13) is opened on the side surface of the lifting cargo compartment (14); The lower end of the drone body (17) is connected to the lifting control box seat frame (2) through the connecting body part (19); The ranging sensor (15) is arranged on the bottom surface of the lifting cargo compartment (14).
2. The medium-sized rescue UAV air cargo device according to claim 1, wherein It further includes a drone parachute (20), and the drone parachute (20) is installed on the top of the drone body (17).
3. The medium-sized rescue UAV air cargo device according to claim 2, characterized in that, It further includes a motor bracket (5), and the driving motor (9) is installed on the inner bottom surface of the lifting control box body (3) through the motor bracket (5).
4. The medium-sized rescue UAV air cargo device according to claim 3, characterized in that, It further includes a ventilation net (10), the ventilation net (10) is opened on the side surface of the lifting control box body (3), and the ventilation net (10) is located on the side of the lifting control box body (3) where the driving motor (9) is arranged.
5. The medium-sized rescue UAV air cargo device according to claim 4, characterized in that, It further includes a first electric magnet (11), a small battery pack body (21), and a second electric magnet (28); the small battery pack body (21) is installed on the bottom surface of the lifting control box body (3), the first electric magnet (11) is installed at the lower end of the small battery pack body (21), and the second electric magnet (28) is installed at the position on the top surface of the lifting cargo compartment (14) opposite to the first electric magnet (11).
6. The medium-sized rescue UAV air cargo device according to claim 5, characterized in that, It further includes a leg fixing device (18) and a drone leg (12), the leg fixing devices (18) are respectively arranged on both sides of the bottom surface of the lifting control box body (3), and each leg fixing device (18) is installed with the outwardly inclined drone leg (12).
7. The air cargo device of a medium-sized rescue drone according to claim 6, characterized in that, It further includes a camera (16), and the camera (16) is disposed beside the distance measuring sensor (15) on the bottom surface of the lifting cargo bin (14).
8. The medium-sized rescue UAV air cargo device according to claim 7, characterized in that, It further includes an electric control small battery pack (22), and the electric control small battery pack (22) is disposed on the front surface of the lifting cargo bin (14), and the electric control small battery pack (22) is electrically connected to the second electric magnet block (28).
9. The medium-sized rescue UAV air cargo device according to claim 8, characterized in that, It further includes a drone hanging rope body (23), a bidirectional connecting hook (24) and a bidirectional hook connecting control box hook (26). The bidirectional connecting hook (24) is installed on the lower surface of the drone body (17), and the bidirectional hook connecting control box hook (26) is installed on the top surface of the lifting control box body (3). The bidirectional connecting hook (24) and the bidirectional hook connecting control box hook (26) are connected by the drone hanging rope body (23).
10. The medium-sized rescue UAV air cargo device according to claim 9, characterized in that, It further includes a shaft middle convex joint body (25), and the shaft middle convex joint body (25) is installed in the middle of the motor shaft body (7). The two lifting ropes (8) are respectively located on both sides of the shaft middle convex joint body (25).