CN107521675B - Foot rest structure opened and closed by turbine worm - Google Patents
Foot rest structure opened and closed by turbine worm Download PDFInfo
- Publication number
- CN107521675B CN107521675B CN201610460992.5A CN201610460992A CN107521675B CN 107521675 B CN107521675 B CN 107521675B CN 201610460992 A CN201610460992 A CN 201610460992A CN 107521675 B CN107521675 B CN 107521675B
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- turbine
- foot rest
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- worm
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- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000000758 substrate Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009975 flexible effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/08—Undercarriages non-fixed, e.g. jettisonable
- B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
- B64C25/18—Operating mechanisms
- B64C25/20—Operating mechanisms mechanical
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
The invention discloses a foot rest structure opened and closed by using a turbine worm rod, which comprises a support fixed on an unmanned aerial vehicle main body, a foot rest rotatably connected with the support, and a transmission mechanism arranged between the support and the foot rest, wherein the transmission mechanism comprises a motor fixed on the support, a worm rod connected with an output shaft of the motor, and a turbine coaxially arranged with a rotating shaft of the foot rest. According to the invention, the motor and the turbine worm are adopted to control the opening and closing of the foot rest of the unmanned aerial vehicle, and when the unmanned aerial vehicle is not put into use, the turbine worm transmission mechanism can control the foot rest to be retracted into the body or attached to the surface of the body, so that the size and the occupied area of the unmanned aerial vehicle are reduced, and the unmanned aerial vehicle is favorably stored.
Description
Technical Field
The invention belongs to the field of unmanned aerial vehicles, relates to an unmanned aerial vehicle with a foot rest capable of being automatically opened and closed, and particularly relates to a foot rest structure opened and closed by a turbine worm.
Background
The unmanned aerial vehicle is also called as an unmanned aerial vehicle, is an unmanned aerial vehicle operated by utilizing a radio remote control device and a self-contained program control device, and is a high-tech product integrating aerodynamics, material mechanics, an automatic control technology and a software technology. The unmanned aerial vehicle has flexible action, lower requirements on taking-off and landing environments, good operation performance and the like, and is widely applied to various fields such as aerial photography, monitoring, detection, search and rescue and the like. This kind of unmanned aerial vehicle all generally has the foot rest to when unmanned aerial vehicle landed, can stand the support to the aircraft through its foot rest.
However, current unmanned aerial vehicle all adopts fixed connection with the foot rest that stretches out and fuselage, and when unmanned aerial vehicle did not drop into the use, the unmanned aerial vehicle that has great foot rest deposits and can occupy great space. Simultaneously, because of the consideration that unmanned aerial vehicle self subtracts heavy, the structure of its each part of self also designs succinctly relatively, consequently, the great unmanned aerial vehicle of foot rest if deposit improper still can cause the breakage danger of unmanned aerial vehicle part. Therefore, designing an unmanned aerial vehicle convenient to store when not in use becomes an important research direction. Meanwhile, in order to realize the unmanned aerial vehicle, a framework mechanism such as the unmanned aerial vehicle, a driving mechanism and a locking mechanism which can realize the unfolding and the folding of a foot rest of the unmanned aerial vehicle need to be newly developed.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a foot rest structure capable of realizing the unfolding and the folding of the foot rest of the unmanned aerial vehicle, solves the problem of large occupied area caused by the storage of the unfolded foot rest when the unmanned aerial vehicle is not put into use, and simultaneously avoids the danger of breaking down the unmanned aerial vehicle possibly caused by the storage.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention discloses a foot rest structure opened and closed by using a turbine worm rod, which comprises a support fixed on an unmanned aerial vehicle main body, a foot rest rotatably connected with the support, and a transmission mechanism arranged between the support and the foot rest, wherein the transmission mechanism comprises a motor fixed on the support, a worm rod connected with an output shaft of the motor, and a turbine coaxially arranged with a rotating shaft of the foot rest.
Further, the support includes a base plate, the both ends that the base plate corresponds the parallel upwards extend respectively and form two support arms, two support arm tip correspond and are provided with the shaft hole, the foot rest is rotationally fixed between two support arms through the foot rest pivot that sets up in the shaft hole.
Furthermore, at least one end of the foot rest rotating shaft extends out of the outer side face of the supporting arm, the turbine and the foot rest rotating shaft are coaxially installed, and the turbine is arranged on the part, extending out of the supporting arm, of the foot rest rotating shaft.
Further, a motor mounting seat is further arranged on the outer side face of the supporting arm at one side where the turbine is located, and a shaft hole is formed in the center of the motor mounting seat.
Furthermore, a scroll bar shaft seat is arranged below the motor mounting seat, one end of the scroll bar shaft seat is connected with the supporting arm, a shaft hole is formed in the center of the scroll bar shaft seat, one end of the scroll bar is close to the shaft hole of the motor mounting seat, and the other end of the scroll bar shaft seat passes through the shaft hole of the scroll bar shaft seat and is fixedly connected with the scroll bar shaft seat through a fastener.
Further, the worm rod is engaged with the turbine, and the worm rod is positioned closer to the base plate relative to the turbine.
Further, be equipped with a protective sleeve between motor mount pad and scroll bar axle bed, protective sleeve corresponds the foot rest pivot and is equipped with the shaft hole, the foot rest pivot pass through the fastener with protective sleeve links to each other.
Furthermore, a motor output shaft of the motor is provided with a reduction gear set.
Furthermore, a fastening seat is arranged between the motor and the motor mounting seat, the fastening seat is provided with a central through hole, and the motor is fixedly mounted on the motor mounting seat through the fastening seat.
Further, be equipped with the reinforcing plate of connecting two fixed support arms between two support arms, the reinforcing plate still links to each other with the base plate, the one end that base plate and reinforcing plate link to each other still is equipped with a fixed plate in the direction of keeping away from the reinforcing plate, fixed plate and unmanned aerial vehicle fixed connection.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: the unmanned aerial vehicle foot stand is controlled to be opened and closed by the motor and the turbine worm as the transmission mechanism, and when the unmanned aerial vehicle is not put into use, the transmission mechanism can control the foot stand to be retracted into the unmanned aerial vehicle body or attached to the surface of the unmanned aerial vehicle body, so that the size and the floor area of the unmanned aerial vehicle are reduced, and the unmanned aerial vehicle is favorably stored and stored; the motor is provided with a reduction gear set, so that the output torque can be increased, and meanwhile, the power transmission is realized by utilizing the turbine worm, the structure is compact, and the transmission ratio is higher; the foot rest is also structurally provided with a limiting mechanism for monitoring the extension or folding angle of the foot rest, the limiting mechanism communicates with the unmanned aerial vehicle to send monitoring signals, the opening and closing angle of the foot rest can be effectively controlled through the limiting mechanism, and the foot rest is prevented from being opened/closed in place or excessively deflected.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is an exploded view of a foot rest structure opened and closed by a turbine scroll;
FIG. 2 is a schematic view of a stand structure opened and closed by a turbine scroll;
FIG. 3 is a schematic view of a stand structure opened and closed by a turbine scroll;
FIG. 4 is a schematic top view of a foot rest structure opened and closed by a turbine scroll;
FIG. 5 is a side view of a foot rest structure opened and closed by a turbine scroll;
fig. 6 is a schematic view of a support structure of a foot stool structure opened and closed by a turbine scroll.
In the figure: 1, a bracket; 2, a transmission mechanism; 3, a foot rest;
101 a substrate; 102 supporting the arm; 103 fixing plate; 104 a motor mounting seat; 105 a protective sleeve; 106 a reinforcing plate;
107 a reinforcing structure; 108 scroll shaft seats; 201 a motor; 202 a reduction gear set; 203 fastening seats; 204 a scroll bar;
205 a turbine; 301 a foot rest rotating shaft.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 1 to 5, the foot rest structure opened and closed by the turbine scroll of the present embodiment mainly includes three major parts: a bracket 1, a transmission mechanism 2 and a foot rest 3. Support 1 links to each other with unmanned aerial vehicle on the one hand, and on the other hand is connected with foot rest 3 through foot rest pivot 301 as the mounting base of drive mechanism 2 again at last. The transmission mechanism 2 comprises a motor 201 and a turbine worm structure, the power output source of the transmission mechanism is the motor 201, the power output source is connected with the turbine worm structure to realize power transmission, and finally the power is transmitted to the foot rest rotating shaft 301 through the turbine 205 to realize the opening and closing control of the foot rest 3.
Example two
As shown in fig. 6, a schematic structural diagram of a support of a foot stool structure opened and closed by a turbine scroll according to the embodiment includes: a substrate 101, wherein the substrate 101 is a rectangular or square plate; two parallel ends of the substrate 101 respectively extend upwards to form two supporting arms 102, and one end of each supporting arm 102 is provided with a shaft hole; a reinforcing plate 106 is arranged between the two supporting arms 102, the reinforcing plate 106 is also connected with the base plate 101, the two supporting arms 102 are fixed in a reinforcing mode, and meanwhile through holes connected with other mechanisms of the unmanned aerial vehicle are formed in the surface of the reinforcing plate 106; the base plate 101 is provided with a fixing plate 103 extending in the direction away from the support arm 102, and the fixing plate 103 is connected with the unmanned aerial vehicle; a reinforcing structure 107 is arranged between the fixing plate 103 and the substrate 101, and is a plurality of triangular plates for reinforcing and supporting the fixing plate 103 and the substrate 101; the outer side of one leg arm 102 is provided with a motor mounting seat 104 for mounting a motor 201; a protective sleeve 105 is arranged at the lower end of the motor mounting seat 104, and the protective sleeve 105 is used for protecting the turbine worm; the lower end of the protective sleeve 105 has a scroll shaft seat 108 connected to the support arm 102, and a shaft hole is formed in the center of the protective sleeve, through which the scroll 204 passes and is connected to the scroll shaft seat 108 by a fastener.
EXAMPLE III
Fig. 1 is an exploded view of a foot stool structure opened and closed by a turbine scroll. The transmission structure 2 comprises, from top to bottom: the motor 201, a reduction gear set 202 installed on the output shaft of the motor, a fastening seat 203, a worm 204 connected with the output shaft of the motor, and a turbine 205 engaged with the worm 204. The motor 201 is electrified to work to drive the motor output shaft to rotate, the reduction gear set 202 mounted on the motor 201 is used for reducing speed, the motor is arranged on the motor mounting seat 104 through the fastening seat 203, one side of the motor output shaft extends out of the fastening seat 203, the motor mounting seat 104 is connected with the worm 204, the worm 204 is meshed with the worm wheel 205, and the worm wheel 204 is arranged behind the worm wheel 205 and is closer to the substrate 101.
The worm gear 205 is sleeved on the foot stool rotating shaft 301, and a protective sleeve 105 for protection is arranged outside the worm gear worm structure, and is integrally designed with the motor mounting seat 104 and the supporting arm 102. The direction of the motor 201 driving the motor output shaft to rotate is clockwise or counterclockwise, when the power is transmitted from the motor 201 to the turbine 205, the turbine 205 rotates to drive the foot stool rotating shaft 301 sleeved and connected with the turbine, and the foot stool rotating shaft 301 rotates to drive the foot stool 3 to open and close to do stretching or folding action.
Example four
The not shown in the figure, this embodiment is the further injeciton of above-mentioned embodiment, the foot rest on be equipped with stop gear structurally, this stop gear is used for monitoring foot rest 3 open or closed angle to with the information that unmanned aerial vehicle communication transmission monitored, unmanned aerial vehicle can judge through the angle information who monitors that the opening and the closure of horn 3 are target in place, thereby control motor 201 rotates or stall. The limiting mechanism can be arranged on the motor 201 to monitor the number of rotation turns of the motor 201; or on the turbine 205, monitoring the number of revolutions of the turbine 205; or on the foot stool rotating shaft 301.
EXAMPLE five
Not shown in the drawings, this embodiment is a further limitation to the second embodiment, in the case that the scroll 204 and the worm wheel 205 run at a high speed, a large amount of heat is generated, and the protection sleeve 105 is modified accordingly in order to make the scroll 204 and the worm wheel 205 radiate heat well. The protection sleeve 105 is provided with a turbine mounting hole for mounting and dismounting the turbine 205 on a part of the turbine 205, which is far away from the base plate 101, and a maintenance observation hole is arranged on a corresponding part of the scroll 204.
Preferably, a strip-shaped maintenance observation hole is provided on the outer side surface of the protection sleeve 105.
The advantages of this embodiment are: the heat dissipation of the scroll 204 and the turbine 205 is facilitated, the service life of the scroll 204 and the turbine 205 is prolonged, and the installation and the maintenance of the scroll 204 and the turbine 205 are facilitated.
EXAMPLE six
In the present embodiment, on the basis of the above-described embodiments, the turbine worm gear mechanisms are disposed on both the supporting arms 102 of the bracket 1, that is, the turbine worm gear mechanisms having the same structure are disposed on both the left and right supporting arms 102.
In the embodiment, two sets of symmetrical turbine worm transmission mechanisms are arranged on the two supporting arms 102, so that the heavy foot stool 3 can be sufficiently supported, and when the foot stool 3 needs to be opened or closed, larger rotation power can be provided, so that the foot stool 3 can be quickly opened or closed.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides an utilize foot rest structure that turbine scroll pole opened and shut, including fix in the unmanned aerial vehicle main part the support, with support rotatable coupling's foot rest, setting are in drive mechanism between support and the foot rest, its characterized in that: the transmission mechanism comprises a motor fixed on the bracket, a worm connected with an output shaft of the motor and a turbine coaxially arranged with the rotating shaft of the foot rest;
the support comprises a base plate, two parallel ends corresponding to the base plate respectively extend upwards to form two supporting arms, a reinforcing plate for connecting and fixing the two supporting arms is arranged between the two supporting arms, the reinforcing plate is also connected with the base plate, a fixing plate is arranged at one end of the base plate, which is connected with the reinforcing plate, in the direction away from the reinforcing plate, and the fixing plate is fixedly connected with the unmanned aerial vehicle;
a plurality of reinforcing structures of triangular plates are arranged between the fixed plate and the base plate and used for reinforcing and supporting the fixed plate and the base plate;
the outer side surface of the supporting arm at one side where the turbine is located is also provided with a motor mounting seat, a worm shaft seat is arranged below the motor mounting seat, a protective sleeve is arranged between the motor mounting seat and the worm shaft seat, the protective sleeve is provided with a shaft hole corresponding to the foot rest rotating shaft, and the foot rest rotating shaft is connected with the protective sleeve through a fastener;
a turbine mounting hole for mounting and dismounting the turbine is formed in the part, far away from the base plate, of the protective sleeve, a maintenance observation hole is formed in the corresponding part, located on the worm rod, of the protective sleeve, and a strip-shaped maintenance observation hole is formed in the outer side face of the protective sleeve;
the foot stool is characterized by further comprising a limiting mechanism used for monitoring the opening or closing angle of the foot stool, wherein the limiting mechanism is arranged on the motor or the worm gear and used for monitoring the number of rotation turns of the motor or the number of rotation turns of the worm gear, or the limiting mechanism is arranged on the rotating shaft of the foot stool.
2. A horse structure opened and closed by a turbine scroll according to claim 1, characterized in that: the end parts of the two supporting arms are correspondingly provided with shaft holes, and the foot rest is rotationally fixed between the two supporting arms through a foot rest rotating shaft arranged in the shaft holes.
3. A horse structure opened and closed by a turbine scroll according to claim 2, characterized in that: at least one end of the foot rest rotating shaft extends out of the outer side face of the supporting arm, the turbine and the foot rest rotating shaft are coaxially installed, and the turbine is arranged on the part, extending out of the outer side of the supporting arm, of the foot rest rotating shaft.
4. A horse structure opened and closed by a turbine scroll according to claim 3, characterized in that: the outer side surface of the supporting arm at one side where the turbine is located is further provided with a motor mounting seat, and the center of the motor mounting seat is provided with a shaft hole.
5. A foot stool structure opened and closed by using a turbine worm as claimed in claim 4, wherein: the motor mounting seat is provided with a scroll bar shaft seat below, one end of the scroll bar shaft seat is connected with the supporting arm, a shaft hole is formed in the center of the scroll bar shaft seat, one end of the scroll bar is close to the shaft hole of the motor mounting seat, and the other end of the scroll bar shaft seat passes through the shaft hole of the scroll bar shaft seat and is fixedly connected with the scroll bar shaft seat through a fastener.
6. A foot stool structure opened and closed by using a turbine worm as claimed in claim 5, wherein: the worm is engaged with the turbine, and the worm is closer to the base plate relative to the turbine.
7. A horse structure opened and closed by a turbine scroll according to claim 1, characterized in that: and a motor output shaft of the motor is provided with a reduction gear set.
8. A horse structure opened and closed by a turbine scroll according to claim 7, characterized in that: the motor mounting structure is characterized in that a fastening seat is arranged between the motor and the motor mounting seat, the fastening seat is provided with a central through hole, and the motor is fixedly mounted on the motor mounting seat through the fastening seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460992.5A CN107521675B (en) | 2016-06-22 | 2016-06-22 | Foot rest structure opened and closed by turbine worm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460992.5A CN107521675B (en) | 2016-06-22 | 2016-06-22 | Foot rest structure opened and closed by turbine worm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107521675A CN107521675A (en) | 2017-12-29 |
| CN107521675B true CN107521675B (en) | 2022-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610460992.5A Expired - Fee Related CN107521675B (en) | 2016-06-22 | 2016-06-22 | Foot rest structure opened and closed by turbine worm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107521675B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827474A (en) * | 2005-02-28 | 2006-09-06 | 欧洲直升机公司 | A device for locking a structure for securing a blade to the hub of a rotocraft rotor |
| CN101767649A (en) * | 2010-01-29 | 2010-07-07 | 中国航天空气动力技术研究院 | Unmanned aerial vehicle undercarriage receive and releases system |
| CN203832749U (en) * | 2014-03-24 | 2014-09-17 | 浙江海洋学院 | Aircraft landing gear |
| CN204916165U (en) * | 2015-06-19 | 2015-12-30 | 深圳一电科技有限公司 | Foot rest and unmanned aerial vehicle |
| CN204937480U (en) * | 2015-08-14 | 2016-01-06 | 中国航空工业集团公司西安飞机设计研究所 | A kind of multistage folded wing assembly and there is its aircraft |
| CN105253296A (en) * | 2015-09-30 | 2016-01-20 | 中航飞机起落架有限责任公司 | Landing-gear raising-lowering device |
| CN205311895U (en) * | 2015-12-24 | 2016-06-15 | 深圳一电航空技术有限公司 | Unmanned aerial vehicle undercarriage receive and releases structure and unmanned aerial vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201001178D0 (en) * | 2010-01-26 | 2010-03-10 | Airbus Operations Ltd | Linear actuator |
-
2016
- 2016-06-22 CN CN201610460992.5A patent/CN107521675B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827474A (en) * | 2005-02-28 | 2006-09-06 | 欧洲直升机公司 | A device for locking a structure for securing a blade to the hub of a rotocraft rotor |
| CN101767649A (en) * | 2010-01-29 | 2010-07-07 | 中国航天空气动力技术研究院 | Unmanned aerial vehicle undercarriage receive and releases system |
| CN203832749U (en) * | 2014-03-24 | 2014-09-17 | 浙江海洋学院 | Aircraft landing gear |
| CN204916165U (en) * | 2015-06-19 | 2015-12-30 | 深圳一电科技有限公司 | Foot rest and unmanned aerial vehicle |
| CN204937480U (en) * | 2015-08-14 | 2016-01-06 | 中国航空工业集团公司西安飞机设计研究所 | A kind of multistage folded wing assembly and there is its aircraft |
| CN105253296A (en) * | 2015-09-30 | 2016-01-20 | 中航飞机起落架有限责任公司 | Landing-gear raising-lowering device |
| CN205311895U (en) * | 2015-12-24 | 2016-06-15 | 深圳一电航空技术有限公司 | Unmanned aerial vehicle undercarriage receive and releases structure and unmanned aerial vehicle |
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| Publication number | Publication date |
|---|---|
| CN107521675A (en) | 2017-12-29 |
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