Automatic take-up and pay-off device for photoelectric composite cable of mooring unmanned aerial vehicle

Abstract

The invention discloses an automatic take-up and pay-off device for a photoelectric composite cable of a mooring unmanned aerial vehicle, and belongs to the technical field of line take-up and pay-off device.The automatic take-up and pay-off device comprises a mounting base, a wire spool and a tensioning mechanism are rotationally mounted on the mounting base, the tensioning mechanism comprises a supporting frame fixedly connected to the mounting base, and two tensioning wheels arranged oppositely are rotationally mounted on the supporting frame; an elastic piece is arranged on the supporting frame and drives the two tensioning wheels to clamp the cable, so that the cable can pass through the tensioning wheels only under the pulling of the unmanned aerial vehicle; according to the automatic take-up and pay-off device provided by the invention, the two tensioning wheels distributed up and down can clamp a cable through the arranged elastic piece, and when the wire spool is driven to rotate and pay off the cable, due to the fact that the cable is clamped by the two tensioning wheels, even if the pay-off speed of the wire spool is larger than the flight speed of an unmanned aerial vehicle, the cable can be taken up and paid off. And the cable can pass through the two tensioning wheels only by being pulled by the unmanned aerial vehicle, and the excessive released cable can be gathered between the wire spool and the tensioning wheels, so that the cable is prevented from being wound on obstacles on the ground.

Description

Technical Field

[0001] The invention relates to the technical field of line retracting and releasing devices, and specifically discloses an automatic retracting and releasing device for a tethered unmanned aerial vehicle optoelectronic composite cable. Background Art

[0002] A tethered drone is a special type of multi-rotor drone that obtains power through a tethered cable connected to the ground. This design allows the tethered drone to hover in the air for a long time without the need to frequently replace batteries or return to the ground to recharge. Since it can hover in the air for a long time, during the disaster relief process, by installing a lighting lamp on the drone and taking advantage of its ability to hover in the air for a long time and provide power for the lighting lamp, it can be used to provide high-brightness, wide-range lighting for night rescue work.

[0003] For example, the patent with announcement number CN212639590U, with announcement date of 2021-03-02, discloses a tethered drone's retractable wire assembly and a ground recovery device, wherein the retractable wire assembly includes a wire drum, a wire pulling assembly, an encoder and a guide assembly, wherein the wire pulling assembly includes a driving wheel and a second drive motor, and the wire drum is connected by a first drive motor. The retractable wire assembly of the ground recovery device drives the driving wheel to rotate by the second drive motor to supply wire, thereby ensuring that the drone always maintains a constant cable tension during operation, avoiding excessive or insufficient cable tension on the tethered drone, thereby ensuring the stability of the tethered drone in the air; and the first drive motor drives the wire drum to rotate to achieve retractable wire, thereby avoiding friction between the cable and the ground and damaging the cable.

[0004] The disadvantage of the existing automatic retractable wire devices for tethered drones, including the above-mentioned patent, is that the speed at which the wire pulling assembly pulls the cable from the cable drum is difficult to keep consistent with the flight speed of the drone, which results in the cable being easily entangled with obstacles on the ground when it is pulled out too much, thereby affecting the normal flight of the drone. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic retractable and retractable device for a tethered unmanned aerial vehicle optical-electric composite cable.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The invention discloses an automatic retractable and retractable device for tethering an optoelectronic composite cable of an unmanned aerial vehicle, comprising a mounting seat, a cable winding drum being rotatably mounted on the mounting seat, a driving member for driving the cable winding drum to rotate being mounted on the mounting seat, a tensioning mechanism being further mounted on the mounting seat, the tensioning mechanism comprising a supporting frame fixedly connected to the mounting seat, two tensioning wheels being rotatably mounted on the supporting frame, and an elastic member being arranged on the supporting frame, the elastic member driving the two tensioning wheels to clamp the cable so that the cable can pass through the tensioning wheel only when the unmanned aerial vehicle is pulled.

[0008] The above-mentioned wire-reeling and reeling device comprises two tensioning wheels, respectively the first tensioning wheel and the second tensioning wheel. Slide blocks are slidably installed on the support frame at both sides of the first tensioning wheel. The elastic members are arranged in one-to-one correspondence with the slide blocks, and the elastic members make their corresponding slide blocks have a tendency to slide along the surface of the support frame toward the side where the second tensioning wheel is located.

[0009] The above-mentioned wire retracting and releasing device, the elastic part includes a limit rod fixedly connected to the slider, the position corresponding to the limit rod on the support frame is provided with an insertion hole, and the support frame is provided with a sliding groove for limiting the slider, within the sliding stroke of the slider, the end of the limit rod is inserted into the corresponding insertion hole, and the part of the limit rod in the sliding groove is equipped with a spring.

[0010] In the above-mentioned wire-reeling and -releasing device, a limit ring is arranged on the mounting seat between the wire winding drum and the tensioning mechanism, and the limit ring is arranged opposite to the tensioning mechanism.

[0011] The inner side surface of the limiting ring of the above-mentioned wire-retracting and releasing device is arc-shaped.

[0012] The above-mentioned wire-reeling and retracting device has a driving assembly disposed on the mounting seat, and the driving assembly drives the limit ring to reciprocate along the axial direction of the winding drum.

[0013] The above-mentioned wire-reeling and retracting device, the driving assembly includes a support rod installed on a support seat, the support rod is arranged along the axial direction of the winding drum, and a reciprocating screw is also rotatably installed on the support seat, the reciprocating screw is arranged parallel to the support rod, and a guide sleeve is mounted on the reciprocating screw, a limit ring is arranged between the guide sleeve and the support rod, and the limit ring is fixedly connected to the guide sleeve, and the limit ring is slidably connected to the support rod.

[0014] In the above-mentioned wire-winding and unwinding device, one-way transmission mechanisms are provided at positions corresponding to the first tensioning wheel and the second tensioning wheel on the support frame. When the winding drum reels the cable, the one-way transmission mechanism prevents the first tensioning wheel and the second tensioning wheel from rotating, so that the cable between the winding drum and the tensioning mechanism is tightened.

[0015] The above-mentioned wire-winding and unwinding device, the one-way transmission mechanism includes a pawl fixedly connected to the rotating shaft of the first tensioning wheel or the second tensioning wheel, and a tooth groove is provided at a position corresponding to the pawl on the support frame and the slider, and a circular array of the tooth grooves is distributed on the support frame and the slider. The ratchet cooperates with the annular tooth groove so that both the first tensioning wheel and the second tensioning wheel can only rotate in one direction.

[0016] In the above-mentioned wire-winding and unwinding device, the first tensioning wheel and the second tensioning wheel both comprise a wheel axle and a wheel body, wherein the wheel body is sleeved on the outside of the wheel axle and is frictionally driven with the wheel axle.

[0017] In the above technical scheme, the automatic wire reeling and winding device provided by the present invention arranges an elastic member on the support frame so that the two tensioning wheels distributed above and below can clamp the cable. When the winding drum is driven to rotate and the cable is released, since the cable is clamped by the two tensioning wheels, even if the unwinding speed of the winding drum is greater than the flight speed of the drone, the cable can only pass through the tensioning wheel under the pull of the drone, and the excess released cable will gather between the winding drum and the tensioning wheel, thereby preventing the excessively unwound cable from being entangled in obstacles on the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A top view of a wire-retracting and -releasing device provided in an embodiment of the present invention;

[0020] Figure 2 A front cross-sectional view of a wire-retracting and -releasing device provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the installation state of the drive assembly provided in the embodiment of the present invention in the mounting seat;

[0022] Figure 4 A schematic diagram of the connection state of the first tensioning wheel and the second tensioning wheel and the mounting plate provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the positional relationship between the first tensioning wheel and the second tensioning wheel provided in an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the matching relationship between the pawl and the tooth groove provided in an embodiment of the present invention;

[0025] Figure 7 The embodiment of the present invention provides Figure 4 A partial enlarged schematic diagram of

[0026] Figure 8 A schematic diagram of the connection relationship between the guide sleeve and the mounting plate provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Mounting seat; 11. Motor; 2. Winding reel; 3. Tensioning mechanism; 31. Support frame; 311. Crossbeam; 312. Mounting plate; 313. Connecting rod; 314. Tooth groove; 32. First tensioning wheel; 321. Ratchet; 322. Wheel axle; 323. Wheel body; 33. Second tensioning wheel; 34. Slider; 35. Slide groove; 4. Elastic member; 41. Limit rod; 42. Spring; 5. Limit ring; 6. Drive assembly; 61. Support rod; 62. Reciprocating screw rod; 63. Guide sleeve. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. 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 circumstances.

[0031] like Figure 1-Figure 8 As shown, an automatic retractable and retractable device for a tethered unmanned aerial vehicle optoelectronic composite cable provided in an embodiment of the present invention comprises a mounting seat 1, a winding drum 2 is rotatably mounted on the mounting seat 1, and a driving member for driving the winding drum 2 to rotate is mounted on the mounting seat 1, a tensioning mechanism 3 is also mounted on the mounting seat 1, and the tensioning mechanism 3 comprises a support frame 31 fixedly connected to the mounting seat 1, two tensioning wheels arranged opposite to each other are rotatably mounted on the support frame 31, and an elastic member 4 is arranged on the support frame 31, and the elastic member 4 drives the two tensioning wheels to clamp the cable so that the cable can pass through the tensioning wheel only when the unmanned aerial vehicle is pulled.

[0032] Specifically, the mounting seat 1 is the main structure of the wire-reeling device, and the winding drum 2 and the driving member are installed on the mounting seat 1. Figure 1 and Figure 3As shown, the cross-section of the mounting seat 1 is U-shaped, and both ends of the winding drum 2 are rotatably connected to the inner wall of the mounting seat 1. Optionally, the driving member is a motor 11 installed on the outer wall of the mounting seat 1, and the output shaft of the motor 11 passes through the side wall of the mounting seat 1 and is fixedly connected to one end of the winding drum 2, so that the motor 11 can drive the winding drum 2 to rotate to achieve the winding and unwinding of the cable, wherein the cable is an optoelectronic composite cable, which is a special type of cable that integrates optical fiber and power cable, and can transmit optical signals and electrical signals at the same time; different from the prior art, a tensioning mechanism 3 is also installed on the mounting seat 1, and the tensioning mechanism 3 includes a support frame 31 and two sets of tensioning wheels, and the central axes of the two sets of tensioning wheels are parallel to the central axis of the winding drum 2, such as Figure 2 As shown, the two sets of tensioning wheels are arranged up and down, the support frame 31 includes a beam 311 horizontally installed on the inner side of the mounting seat 1 and two sets of parallel mounting plates 312 installed on the beam 311, and the two tensioning wheels are rotatably installed between the two mounting plates 312, as shown in FIG. Figure 4 As shown, both ends of the two tension wheels are stably restricted. In addition, an elastic member 4 is provided on the support frame 31, and the elastic member 4 is connected to any tension wheel so that the two tension wheels can be close to each other, ensuring that the cable can be clamped by the two tension wheels; in specific implementation, the cable is wound on the winding drum 2, and the end of the cable connected to the drone passes through between the two tension wheels, and the other end of the cable is connected to the interior of the winding drum 2 and connected to the plug through a conductive ring. This is a prior art and can be directly applied without further elaboration, so that the rotation of the winding drum 2 during the unwinding process will not affect the connection of the cable circuit.

[0033] The automatic wire-winding and -releasing device provided in the embodiment of the present invention arranges an elastic member 4 on the support frame 31 so that the two tensioning wheels distributed above and below can clamp the cable. When the wire winding drum 2 is driven to rotate and the cable is released, since the cable is clamped by the two tensioning wheels, even if the unwinding speed of the wire winding drum 2 is greater than the flight speed of the UAV, the cable can only pass through the tensioning wheel under the pulling of the UAV, and the excess released cable will gather between the wire winding drum 2 and the tensioning wheel, thereby preventing the excessively unwound cable from being entangled in obstacles on the ground.

[0034] Furthermore, the two tensioning wheels are respectively the first tensioning wheel 32 and the second tensioning wheel 33, and sliders 34 are slidably installed on the support frame 31 at the positions on both sides of the first tensioning wheel 32. The elastic member 4 and the slider 34 are arranged in a one-to-one correspondence, and the elastic member 4 makes its corresponding slider 34 have a tendency to slide along the surface of the support frame 31 toward the side where the second tensioning wheel 33 is located.

[0035] Furthermore, the elastic member 4 includes a limit rod 41 fixedly connected to the slider 34, and a plug-in hole is provided at a position corresponding to the limit rod 41 on the support frame 31, and a slide groove 35 for limiting the slider 34 is provided on the support frame 31. Within the sliding stroke of the slider 34, the end of the limit rod 41 is plugged into the corresponding plug-in hole, and the part of the limit rod 41 in the slide groove 35 is covered with a spring 42.

[0036] Specifically, for ease of description, the two tensioning wheels are respectively a first tensioning wheel 32 and a second tensioning wheel 33. Figure 4 and Figure 5 As shown, the first tensioning wheel 32 is at the top. In order to enable the first tensioning wheel 32 to move relative to the second tensioning wheel 33, thereby adjusting the distance between the first tensioning wheel 32 and the second tensioning wheel 33, in this embodiment, the support frame 31 is located at both sides of the first tensioning wheel 32 and is vertically provided with a slide groove 35. Slide blocks 34 are installed in the slide grooves 35. The first tensioning wheel 32 is rotatably connected to the two slide blocks 34. The opening direction of the slide groove 35 on the slide block 34 is also Figure 6 The limiting rod 41 is fixedly connected in the vertical direction of the view, and the mounting plate 312 of the support frame 31 is provided with a plug-in hole at the position corresponding to the slider 34, and the end of the limiting rod 41 away from the slider 34 is plugged into the corresponding limiting hole, and the part of the limiting rod 41 in the slide groove 35 is covered with a spring 42, and the two ends of the spring 42 are respectively in contact with the slider 34 and the mounting plate 312. While limiting the position of the spring 42, the limiting rod 41 can also guide the sliding of the slider 34 by cooperating with the plug-in hole, and the force of the spring 42 on the slider 34 makes the slider 34 in the slide groove 35. Figure 6 The lowermost end in the view makes it possible for the first tensioning wheel 32 to press the cable onto the second tensioning wheel 33; this arrangement can ensure that the cable is clamped by the first tensioning wheel 32 and the second tensioning wheel 33, while preventing the cable from being excessively squeezed, and when the cable needs to be replaced due to damage, the end of the cable connected to the drone can be passed between the first tensioning wheel 32 and the second tensioning wheel 33 by moving the first tensioning wheel 32 upward, thereby replacing the entire cable.

[0037] In another embodiment provided by the present invention, a limit ring 5 is arranged on the mounting seat 1 between the winding drum 2 and the tensioning mechanism 3 , and the limit ring 5 is arranged opposite to the tensioning mechanism 3 .

[0038] Preferably, the inner side surface of the limiting ring 5 is arc-shaped.

[0039] Specifically, since the portion of the winding drum 2 used for winding has a certain size along its own axial direction, the cable cannot pass between the first tension wheel 32 and the second tension wheel 33 in a posture perpendicular to the first tension wheel 32 or the second tension wheel 33 during the unwinding process, which causes the cable to be easily separated from the first tension wheel 32 and the second tension wheel 33 when subjected to a large pulling force from the drone; in this embodiment, a limit ring 5 is also installed on the mounting seat 1, such as Figure 2 and Figure 3 As shown, the limit ring 5 is directly opposite to the gap between the first tension wheel 32 and the second tension wheel 33 for the cable to pass through, so that the cable can pass through the first tension wheel 32 and the second tension wheel 33 in a posture perpendicular to the central axis of the first tension wheel 32 or the second tension wheel 33, thereby preventing the cable from detaching from the first tension wheel 32 and the second tension wheel 33; preferably, the inner side surface of the limit ring 5 is arc-shaped, so as to reduce the friction between the cable and the limit ring 5 and slow down the wear rate of the cable.

[0040] Furthermore, a driving assembly 6 is provided on the mounting seat 1 , and the driving assembly 6 drives the limiting ring 5 to reciprocate along the axial direction of the winding drum 2 .

[0041] Furthermore, the driving assembly 6 includes a support rod 61 installed on a support seat, the support rod 61 is arranged along the axial direction of the winding reel 2, and a reciprocating screw 62 is also rotatably installed on the support seat, the reciprocating screw 62 is arranged parallel to the support rod 61, and a guide sleeve 63 is mounted on the reciprocating screw 62. The limiting ring 5 is arranged between the guide sleeve 63 and the support rod 61, and the limiting ring 5 is fixedly connected to the guide sleeve 63, and the limiting ring 5 is slidably connected to the support rod 61.

[0042] Specifically, in the above embodiment, due to the restriction of the limit ring 5 on the cable, most of the cables are wound around the middle of the winding drum 2 during the winding process. The cables in the middle area are too dense, making the entire cable chaotic and difficult to keep in an orderly state, increasing the possibility of knotting, and in the unwinding process, the friction between the cables increases, which can easily damage the cable skin. In this embodiment, a support rod 61 is installed on the inner side of the support seat along the axial direction of the winding drum 2, and a reciprocating screw rod 62 is also rotatably installed on the support seat parallel to the support rod 61. Figure 3 As shown, the reciprocating screw 62 is installed just above the support rod 61, and a guide sleeve 63 is sleeved on the outside of the reciprocating screw 62. A guide pin is provided on the inner wall of the guide sleeve 63. The guide pin cooperates with the groove provided on the reciprocating screw 62. This is the prior art and can be directly applied without further explanation. The upper part of the limit ring 5 is fixedly connected to the guide sleeve 63, and the lower part of the limit ring 5 is slidably connected to the support rod 61. A guide groove is provided on the support rod 61 along its own length direction. The limit rod 41 slides along the length direction of the support rod 61 under the restriction of the guide groove. In addition, as shown in FIG. Figure 1As shown, another motor 11 is also installed on the support seat, and the output shaft of the motor 11 is fixedly connected to one end of the reciprocating screw rod 62; when it is necessary to reel in the cable, the two motors 11 are started at the same time to drive the reciprocating screw rod 62 and the winding drum 2 to rotate respectively, and the winding drum 2 reels the released cable, and in this process, the reciprocating screw rod 62 is driven to rotate, and drives the guide sleeve 63 to reciprocate along the axial direction of the reciprocating screw rod 62, and the guide sleeve 63 drives the limit ring 5 to move synchronously, and continuously adjusts the position of the cable, so as to ensure that the cable can be neatly and evenly reeled onto the winding drum 2; in addition, in this embodiment, unlike the above-mentioned embodiment, the two mounting plates 312 are slidably mounted on the cross beam 311, and the mounting plates 312 can only slide along the length direction of the cross beam 311, such as Figure 8 As shown, the two mounting plates 312 are connected to the guide sleeve 63 via a connecting rod 313, so that during the cable winding process, the first tensioning wheel 32 and the second tensioning wheel 33 can move synchronously with the limiting ring 5, thereby preventing the cable from being separated from the first tensioning wheel 32 and the second tensioning wheel 33 due to the lateral pulling of the limiting ring 5, that is, the axial pulling force along the reciprocating screw rod 62.

[0043] In another embodiment provided by the present invention, a one-way transmission mechanism is provided at the positions corresponding to the first tensioning wheel 32 and the second tensioning wheel 33 on the support frame 31. When the winding drum 2 reels the cable, the one-way transmission mechanism prevents the first tensioning wheel 32 and the second tensioning wheel 33 from rotating, so that the cable between the winding drum 2 and the tensioning mechanism 3 is tightened.

[0044] Furthermore, the one-way transmission mechanism includes a pawl 321 fixedly connected to the rotating shaft of the first tensioning wheel 32 or the second tensioning wheel 33, and a tooth groove 314 is provided at a position corresponding to the pawl 321 on the support frame 31 and the slider 34. The tooth grooves 314 are distributed in a circular array on the support frame 31 and the slider 34. The pawl 321 cooperates with the annular tooth groove 314 so that the first tensioning wheel 32 and the second tensioning wheel 33 can only rotate in one direction.

[0045] Specifically, in the above embodiment, since the first tensioning wheel 32 and the second tensioning wheel 33 can rotate freely on the mounting plate 312, the cable between the winding drum 2 and the tensioning mechanism 3 cannot be tightened during the cable winding process of the winding drum 2, resulting in the wound cable being relatively loose, especially after the winding drum 2 stops suddenly, the cable will continue to move between the winding drum 2 and the tensioning mechanism 3 due to inertia, resulting in the last wound portion of the cable being loosened; in this embodiment, ratchets 321 are fixedly connected to the rotating shafts of the first tensioning wheel 32 and the second tensioning wheel 33, such as Figure 6As shown, the mounting plate 312 and the slider 34 are both provided with tooth grooves 314, and the tooth grooves 314 are arranged in a circular array with the central axis of the rotating shaft of the first tensioning wheel 32 or the second tensioning wheel 33 as the central axis, wherein the ratchet 321 is an arc-shaped elastic sheet, which can extend into the tooth groove 314 when it is in the initial state. During the process of unwinding the winding drum 2, the drone pulls the cable through the first tensioning wheel 32 and the second tensioning wheel 33, and the friction between the cable and the first tensioning wheel 32 and the second tensioning wheel 33 The force drives the first tension wheel 32 and the second tension wheel 33 to rotate. At this time, the ratchet 321 is restricted by the tooth groove 314 and deforms to approach the outer wall of the rotating shaft and revolve closely against the mounting plate 312 or the inner wall of the slider 34. When the winding drum 2 reels the cable, the cable passes through the first tension wheel 32 and the second tension wheel 33 under the pull of the winding drum 2 (the moving direction is opposite to that when unwinding the cable). At this time, the ratchet 321 is restricted by the tooth groove 314 and cannot revolve, so that the first tension wheel 32 The first tensioning wheel 32 and the second tensioning wheel 33 can only rotate in one direction; it should be noted that the pawls 321 on the first tensioning wheel 32 and the second tensioning wheel 33 are oriented in opposite directions, so that the first tensioning wheel 32 and the second tensioning wheel 33 can rotate in opposite directions. With this arrangement, during the cable winding process, the cable cannot drive the first tensioning wheel 32 and the second tensioning wheel 33 to rotate. At this time, the clamping force of the first tensioning wheel 32 and the second tensioning wheel 33 on the cable can ensure that the cable between the winding drum 2 and the tensioning mechanism 3 is in a taut state, thereby ensuring that the cable can be wound tightly; on the other hand, during the unwinding process, since the pawl 321 contacts the inner wall of the tooth groove 314 when it rotates, the friction between the pawl 321 and the inner wall of the tooth groove 314 causes a certain resistance to the rotation of the first tensioning wheel 32 or the second tensioning wheel 33, so that the drone can tighten the cable as much as possible and reduce the shaking of the cable caused by wind or other external factors, thereby ensuring that the drone maintains a stable flight attitude.

[0046] Furthermore, the first tensioning wheel 32 and the second tensioning wheel 33 each include a wheel axle 322 and a wheel body 323 . The wheel body 323 is sleeved on the outside of the wheel axle 322 and is frictionally driven with the wheel axle 322 .

[0047] Specifically, in the above embodiment, when the cable winding drum 2 rotates to reel in the cable, the first tensioning wheel 32 and the second tensioning wheel 33 cannot rotate in the opposite direction (in the opposite direction of the rotation direction when unwinding the cable), which causes the cable to be easily excessively worn; in this embodiment, the first tensioning wheel 32 and the second tensioning wheel 33 both include a wheel axle 322 and a wheel body 323, and the wheel axle 322 is also the rotating shaft in the above embodiment, such as Figure 7As shown, the wheel body 323 is mounted on the outside of the wheel axle 322 and is frictionally driven with the wheel axle 322. Obviously, in a specific implementation, the friction force between the wheel axle 322 and the wheel body 323 can be set according to the winding needs to ensure that the cable between the winding drum 2 and the tensioning mechanism 3 can be tightened when the cable is wound.

[0048] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic retractable cable device for tethering an unmanned aerial vehicle optoelectronic composite cable, comprising a mounting seat, a winding drum rotatably mounted on the mounting seat, and a driving member for driving the winding drum to rotate mounted on the mounting seat, characterized in that: A tensioning mechanism is also installed on the mounting seat, and the tensioning mechanism includes a support frame fixedly connected to the mounting seat, on which two tensioning wheels arranged opposite to each other are rotatably installed, and an elastic member is provided on the support frame, which drives the two tensioning wheels to clamp the cable so that the cable can pass through the tensioning wheel only when the drone is pulled.

2. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 1 is characterized in that: The two tensioning wheels are the first tensioning wheel and the second tensioning wheel respectively. Slide blocks are slidably installed on the support frame at both sides of the first tensioning wheel. The elastic members are arranged one by one corresponding to the slide blocks, and the elastic members make their corresponding slide blocks have a tendency to slide along the surface of the support frame toward the side where the second tensioning wheel is located.

3. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 2 is characterized in that: The elastic part includes a limit rod fixedly connected to the slider, and a plug-in hole is provided at a position corresponding to the limit rod on the support frame, and a slide groove for limiting the slider is provided on the support frame. Within the sliding stroke of the slider, the ends of the limit rod are plugged into the corresponding plug-in holes, and the parts of the limit rod in the slide groove are covered with springs.

4. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 1 is characterized in that: A limit ring is arranged on the mounting seat between the winding drum and the tensioning mechanism, and the limit ring is arranged opposite to the tensioning mechanism.

5. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 4 is characterized in that: The inner side surface of the limiting ring is arc-shaped.

6. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 4, characterized in that: A driving assembly is arranged on the mounting seat, and the driving assembly drives the limiting ring to reciprocate along the axial direction of the winding drum.

7. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 6, characterized in that: The driving assembly includes a support rod installed on a support seat, the support rod is arranged along the axial direction of the winding disk, and a reciprocating screw is also rotatably installed on the support seat. The reciprocating screw is arranged parallel to the support rod, and a guide sleeve is mounted on the reciprocating screw. A limit ring is arranged between the guide sleeve and the support rod, and the limit ring is fixedly connected to the guide sleeve, and the limit ring is slidably connected to the support rod.

8. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 2, characterized in that: One-way transmission mechanisms are provided at positions corresponding to the first tensioning wheel and the second tensioning wheel on the support frame. When the winding drum reels the cable, the one-way transmission mechanism prevents the first tensioning wheel and the second tensioning wheel from rotating, so that the cable between the winding drum and the tensioning mechanism is tightened.

9. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 8, characterized in that: The one-way transmission mechanism includes a pawl fixedly connected to the rotating shaft of the first tensioning wheel or the second tensioning wheel, and a tooth groove is provided at a position corresponding to the pawl on the support frame and the slider. A circular array of tooth grooves is distributed on the support frame and the slider. The pawl cooperates with the annular tooth groove so that the first tensioning wheel and the second tensioning wheel can only rotate in one direction.

10. The automatic retractable and retractable device for the tethered UAV optoelectronic composite cable according to claim 9, characterized in that: The first tensioning wheel and the second tensioning wheel both include a wheel axle and a wheel body. The wheel body is sleeved on the outside of the wheel axle and is frictionally driven with the wheel axle.

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