CN210653631U - Bidirectional foldable coaxial structure - Google Patents

Abstract

The utility model discloses a pair of two-way folding coaxial structure, include: the first rotor wing group, the second rotor wing group and the central fixed shaft; the first rotor wing group comprises two first rotor wings, a first connecting seat and a first rotor wing folding mechanism; the second rotor wing group comprises two second rotor wings, a second connecting seat and a second rotor wing folding mechanism; the first connecting seat and the second connecting seat are sleeved on the central fixed shaft, and the two first rotors are symmetrically fixed on two sides of the first rotor folding mechanism so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the first rotor folding mechanism; two the both sides at second rotor folding mechanism are fixed to the second rotor symmetry to carry out the horizontal folding in the horizontal direction and the vertical folding in the longitudinal direction respectively through second rotor folding mechanism. The utility model discloses can realize horizontal, vertical two-way folding for have the technological effect that reduces the storage space when being applied to unmanned aerial vehicle with it.

Description

Bidirectional foldable coaxial structure

Technical Field

The utility model belongs to the technical field of unmanned aerial vehicle, in particular to two-way folding coaxial structure.

Background

Unmanned aerial vehicle is called unmanned aerial vehicle for short, and is unmanned aerial vehicle operated by radio remote control equipment and self-contained program control device. The machine has no cockpit, but is provided with an automatic pilot, a program control device, an information acquisition device and other equipment. The personnel on the ground, the naval vessel or the mother aircraft remote control station can track, position, remotely control, telemeter and digitally transmit the personnel through equipment such as a radar. The airplane can take off like a common unmanned aerial vehicle or launch and lift off by a boosting rocket under the radio remote control, and can also be carried to the air by a mother airplane to launch and fly. Unmanned aerial vehicles are often used for inspection of power transmission lines in mountainous areas and across large rivers, and for inspection of power transmission lines during ice disasters, flood disasters, earthquakes, landslides, and nights.

Present coaxial unmanned aerial vehicle is by the upper and lower paddle full displacement control of last rotor and lower rotor, it can only accomodate through horizontal folding mode usually when accomodating, this kind of coaxial unmanned aerial vehicle that can only horizontal folding function, when unmanned aerial vehicle itself is bulky (like four rotor type or six rotor type etc.), because unmanned aerial vehicle itself is bulky needs take up space, so only through horizontal folding can, but to some small unmanned aerial vehicle (mini cylinder type unmanned aerial vehicle etc.), because unmanned aerial vehicle itself is small, and can not satisfy when only transversely folding this moment and accomodate the requirement, there is the big technical defect in occupation space.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem how to provide a two-way folding coaxial structure can realize horizontal, vertical two-way folding for have the technological effect that reduces storage space when being applied to unmanned aerial vehicle with it.

In order to solve the technical problem, the utility model provides a two-way folding coaxial structure, include: the first rotor wing group, the second rotor wing group and the central fixed shaft; the first rotor wing group comprises two first rotor wings, a first connecting seat and a first rotor wing folding mechanism; the first connecting seat is sleeved on the central fixed shaft, the first rotor wing folding mechanisms are fixedly connected with the first connecting seat, and the two first rotor wings are symmetrically fixed on two sides of the first rotor wing folding mechanisms so as to respectively perform transverse folding in the transverse direction and longitudinal folding in the longitudinal direction through the first rotor wing folding mechanisms; a first threaded hole is formed in the first connecting seat; the second rotor wing group comprises two second rotor wings, a second connecting seat and a second rotor wing folding mechanism; the second connecting seats are sleeved on the central fixed shaft, the second rotor wing folding mechanisms are fixedly connected with the second connecting seats, and the two second rotor wings are symmetrically fixed on two sides of the second rotor wing folding mechanisms so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the second rotor wing folding mechanisms; wherein, the center fixed axle has a stiff end, and passes through the stiff end passes in proper order first connector block, motor with the second rotor group makes first rotor group second rotor group reaches the motor separately with the center fixed axle is the center pin symmetric distribution, first rotor group, the symmetry of second rotor group are fixed the upper and lower terminal surface department of motor, in order to pass through the motor winds drive respectively when the center fixed axle is rotatory first rotor group with second rotor group rotates.

Optionally, the first rotor folding mechanism comprises: two first oar press from both sides, each first oar presss from both sides including first parallel arm, second parallel arm, first round pin axle and first convex arm, first connecting hole has been seted up to first parallel arm, the second connecting hole has been seted up on the second parallel arm, the third connecting hole has been seted up on the first convex arm, first parallel arm with the second parallel arm is fixed through respective tip on the first convex arm, and with first convex arm forms a groove structure, so that arbitrary one first rotor is in corresponding through its tip setting in the groove structure, and pass through first round pin axle pass in proper order first connecting hole the tip of first rotor reaches the second connecting hole, with arbitrary one first rotor and its one that corresponds first oar presss from both sides the round pin hub connection.

Optionally, the first rotor folding mechanism further comprises: the first propeller hub comprises two first concave arms and a first connecting ring, the two first concave arms are symmetrically fixed on two sides of the first connecting ring, each first concave arm corresponds to one first convex arm and is connected with the corresponding first convex arm through the third connecting hole pin shaft, a second threaded hole corresponding to the first threaded hole is formed in the first connecting ring, the first connecting ring is sleeved on the first connecting seat, and a first screw sequentially penetrates through the first threaded hole and the second threaded hole to enable the first connecting ring to be in threaded connection with the first connecting seat.

Optionally, the second rotor folding mechanism comprises: two second oar presss from both sides, each the second oar presss from both sides including third parallel arm, fourth parallel arm, second round pin axle and second convex arm, the fifth connecting hole has been seted up to the third parallel arm, the sixth connecting hole has been seted up on the fourth parallel arm, the seventh connecting hole has been seted up on the second convex arm, the third parallel arm with the fourth parallel arm is fixed through respective tip on the second convex arm, and with the second convex arm forms a groove structure, so that arbitrary one the second rotor is corresponding through its tip setting in the groove structure, and pass through the second round pin axle passes in proper order the fifth connecting hole the tip of second rotor reaches the sixth connecting hole, will arbitrary one the second rotor and its one that corresponds the second oar presss from both sides the round pin hub connection.

Optionally, the second rotor folding mechanism further comprises: the second hub comprises two second concave arms, a second connecting ring, a connecting shaft and two force guide arms for conducting driving force, the two second concave arms are symmetrically fixed on two transverse sides of the second connecting ring, each second concave arm is correspondingly connected with one second convex arm through a seventh connecting hole pin shaft, and a fourth connecting hole is formed in the second connecting seat; the second connecting ring is provided with an eighth connecting hole corresponding to the fourth connecting hole, the second connecting ring is sleeved on the second connecting seat, and the connecting shaft sequentially penetrates through the eighth connecting hole and the fourth connecting hole to rotatably connect the second connecting ring and the second connecting seat; the two guide force arms are symmetrically fixed on two longitudinal sides of the second connecting ring and are respectively movably connected with the variable pitch assembly, so that the two guide force arms are driven by the variable pitch assembly to drive the second connecting ring to rotate around the connecting shaft.

Optionally, the first parallel arm and the second parallel arm are parallel to each other.

Optionally, the third parallel arm and the fourth parallel arm are parallel to each other.

Optionally, the folding angle of the first parallel arm and/or the second parallel arm relative to the first concave arm is 0-90 °.

Optionally, the fold angle of the third parallel arm and/or the fourth parallel arm relative to the second concave arm is between 0 ° and 90 °.

Optionally, the folding angle of the first rotor wing relative to the first paddle clip is 0-180 °; and/or the folding angle of the second rotor wing relative to the second paddle clamp is 0-180 degrees.

Has the advantages that:

the utility model relates to a two-way folding coaxial structure, include: the first rotor wing group, the second rotor wing group and the central fixed shaft; the first rotor wing group comprises two first rotor wings, a first connecting seat and a first rotor wing folding mechanism; the second rotor wing group also comprises two second rotor wings, a second connecting seat and a second rotor wing folding mechanism; the first connecting seat and the second connecting seat are sleeved on the central fixed shaft, and the two first rotors are symmetrically fixed on two sides of the first rotor folding mechanism so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the first rotor folding mechanism; the two second rotors are symmetrically fixed on two sides of the second rotor folding mechanism so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the second rotor folding mechanism; simultaneously the stiff end of central fixed axle passes first connecting seat, motor and second rotor group in proper order for first rotor group, second rotor group and motor use central fixed axle as the center pin symmetric distribution separately, and drive first rotor group and second rotor group respectively when rotatory around central fixed axle through the motor and rotate. The utility model discloses can realize horizontal, vertical two-way folding for have the technological effect that reduces the storage space when being applied to unmanned aerial vehicle with it.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an overall folded structure of an unmanned aerial vehicle provided in an embodiment of the present invention;

fig. 2 is a schematic view of the whole structure of the unmanned aerial vehicle before folding provided by the embodiment of the present invention;

fig. 3 is a schematic overall structure diagram of a coaxial structure provided by an embodiment of the present invention;

fig. 4 is a schematic view of a connection relationship between a motor and a rotor assembly in the whole unmanned aerial vehicle provided by the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a motor according to an embodiment of the present invention;

fig. 6 is a first schematic structural diagram of a first rotor folding mechanism according to an embodiment of the present invention;

fig. 7 is a first schematic structural diagram of a second rotor folding mechanism according to an embodiment of the present invention;

fig. 8 is a second schematic structural view of the first rotor folding mechanism according to the embodiment of the present invention;

fig. 9 is a second schematic structural view of a second rotor folding mechanism according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art belong to the protection scope of the present invention; the "and/or" keyword "referred to in this embodiment represents sum or two cases, in other words, a and/or B mentioned in the embodiment of the present invention represents two cases of a and B, A or B, and describes three states where a and B exist, such as a and/or B, representing: only A does not include B; only B does not include A; including A and B.

Also, in embodiments of the invention, when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.

Referring to fig. 1-9, the present invention relates to a bidirectional foldable coaxial structure, comprising: a first rotor set 21, a second rotor set 22 and a central fixed shaft 23; wherein, the first rotor set 21 includes two first rotors 211, a first connection seat 212 and a first rotor folding mechanism 213; the second rotor set 22 also comprises two second rotors 221, a second connection seat 222 and a second rotor folding mechanism 223; the first connecting seat 212 and the second connecting seat 222 are both sleeved on the central fixing shaft 23, and the two first rotors 211 are symmetrically fixed on two sides of the first rotor folding mechanism 213, so that the first rotor folding mechanism 213 can respectively perform transverse folding in the transverse direction and longitudinal folding in the longitudinal direction; the two second rotors 221 are symmetrically fixed on two sides of the second rotor folding mechanism 223, so that the second rotor folding mechanism 223 can respectively perform transverse folding in the transverse direction and longitudinal folding in the longitudinal direction; meanwhile, the fixed end 232 of the central fixed shaft 23 sequentially penetrates through the first connecting seat 212, the motor 1 and the second rotor group 22, so that the first rotor group 21, the second rotor group 22 and the motor 1 are respectively symmetrically distributed by taking the central fixed shaft 23 as a central axis, and the motor 1 respectively drives the first rotor group 21 and the second rotor group 22 to rotate around the central fixed shaft. The utility model discloses can realize horizontal, vertical two-way folding for have the technological effect that reduces the storage space when being applied to unmanned aerial vehicle with it.

For further explanation of the present invention, please refer to the following explanation to explain the technical problems to be solved and the technical effects to be achieved.

The utility model provides a two-way folding coaxial structure is applied to unmanned aerial vehicle, including first rotor group 21, second rotor group 22 and central fixed axle 23 to stiff end 231 through central fixed axle 23 passes first rotor group 21, central perpendicular groove and second rotor group 22 in proper order.

Wherein, first rotor group 21 specifically includes: two first rotors 211, a first connection base 212, and a first rotor folding mechanism 213. This first rotor folding mechanism 213 is used for connecting two first rotors 211 for realize two first rotors 211's horizontal folding and vertical folding, first connector 212 is used for being connected two first rotors 211, first connector 212 and first rotor folding mechanism 213 with central fixed axle 23, and central fixed axle 23 cover is established in the central vertical slot of motor 1, and first connector 212 and motor 1 fixed connection to it rotates to rotate two first rotors 211 to rotate 12 drive through the last rotation of motor 1.

Specifically, the first connection seat 212 is provided with a first threaded hole 2121, and the first connection seat 212 is sleeved on the central fixed shaft 23 and fixed on the first inner circle structure 1221 of the first rotor 122 through a plurality of first mounting holes 1221 a. First rotor folding mechanism 213 and first connector 212 fixed connection, two first rotors 211 are fixed in the both sides of first rotor folding mechanism 213 of symmetry to carry out horizontal folding and the vertical folding in the longitudinal direction in the horizontal direction respectively through first rotor folding mechanism.

Further, the first rotor folding mechanism 213 includes: two first paddle clips 2131 and a first hub 2132. Each first paddle clamp 2131 includes a first parallel arm 21311, a second parallel arm 21312, a first pin 21313, and a first protruding arm 21314, the first parallel arm 21311 is provided with a first connecting hole 21311a, the second parallel arm 21312 is provided with a second connecting hole 21312a, the first protruding arm 21314 is provided with a third connecting hole 21314a, the first parallel arm 21311 and the second parallel arm 21312 are fixed on the first protruding arm 21314 through respective ends, and form a groove 2133 structure with the first protruding arm 21314, so that any one first rotor 211 is disposed in the corresponding groove 2133 structure through the end thereof, and sequentially passes through the first connecting hole 21311a, the end of the first rotor 211, and the second connecting hole 21312a through a first pin 21313, so as to connect any one first rotor 211 with a corresponding first paddle clamp 2131 through the pin. That is, in the embodiment of the present invention, it can be understood that 2 symmetrical first paddle holders 2131 are disposed on the left and right sides of the first rotor folding mechanism 213 for installing two symmetrical first rotors 211, and each of the first paddle holders 2131 on the left and right sides is provided with a recess 2133 structure formed by a first parallel arm 21311, a second parallel arm 21312 and a first protruding arm 21314, so that the end of the first rotor 211 can be inserted into the recess 2133 structure, and the first rotor folding mechanism and the second rotor folding mechanism can be connected through the first pin 21313, the first connection hole 21311a and the second connection hole 21312 a.

In addition, the first hub 2131 includes two first concave arms 21321 and one first connecting ring 21322, the two first concave arms 21321 are symmetrically fixed on two sides of the first connecting ring 21322, each first concave arm 21321 is connected with one first convex arm 21314 through a third connecting hole 21314a by a pin, a second threaded hole 21322a corresponding to the first threaded hole 2121 is arranged on the first connecting ring 21322, the first connecting ring 21322 is sleeved on the first connecting seat 212, and the first connecting ring 21322 is connected with the first connecting seat 212 by a first screw passing through the first threaded hole 2121 and the second threaded hole 21322a in sequence. That is, in the embodiment of the present invention, it can be understood that 2 first concave arms 21321 are symmetrically disposed on the left and right sides of the first hub 2131, and the 2 first concave arms 21321 correspond to the 2 first convex arms 21314, and each first convex arm 21314 is connected to a corresponding one of the first concave arms 21321 through a corresponding third connecting hole 21314 a.

It should be noted that each first paddle clip 2131 is connected with a corresponding first concave arm 21321 of the first hub 2131 through a first convex arm 21314 by a pin, so that the first paddle clip 2131 can rotate and fold around the first concave arm 21321 (i.e., the first paddle clip 2131) in the longitudinal direction through the pin connection, and meanwhile, because the end portions of the two first rotors 211 are inserted into the structures of the concave grooves 2133 and are also connected through the pin of the first pin 21313, the first rotors 211 can rotate and fold in the transverse direction relative to the first paddle clip 2131, thereby achieving the transverse folding and the longitudinal folding of the first rotors 211 in the process of storing the flying device, reducing the storage volume of the flying device, and achieving the technical effect of saving the occupied space.

Similar to the structure of the first rotor set 21, the second rotor set 22 in the embodiment of the present invention specifically includes: two second rotors 221, a second connection mount 222, and a second rotor folding mechanism 223. The second connecting seat 222 is provided with a fourth connecting hole 2221, the second connecting seat 222 is sleeved on the central fixing shaft 23, and the second connecting seat 222 is fixed on the second inner circle structure of the lower rotating body 13 of the motor 1 through a plurality of second mounting holes. Meanwhile, the second rotor folding mechanism 223 is fixedly connected with the second connecting seat 222, and the two second rotors 222 are symmetrically fixed at two sides of the second rotor folding mechanism 223 so as to respectively perform transverse folding in the transverse direction and longitudinal folding in the longitudinal direction through the second rotor folding mechanism 223.

Further, the second rotor folding mechanism 223 includes: two second paddle clamps 2231, each second paddle clamp 2231 includes a third parallel arm 22311, a fourth parallel arm 22312, a second pin 22313, and a second convex arm 22314. The third parallel arm 22311 is provided with a fifth connecting hole 22311a, the fourth parallel arm 22312 is provided with a sixth connecting hole 22312a, the second convex arm 22314 is provided with a seventh connecting hole 22314a, the third parallel arm 22311 and the fourth parallel arm 22312 are fixed on the second convex arm 22314 through respective ends, and form a groove 2133 structure with the second convex arm 22314, so that any one of the second rotors 221 is arranged in the corresponding groove 2133 structure through the end thereof, and sequentially passes through the fifth connecting hole 22311a, the end of the second rotor 221 and the sixth connecting hole 22312a through the second pin 22313, and any one of the second rotors 221 is pin-connected with a corresponding one of the second paddle clamps 2231;

that is, in the embodiment of the present invention, it can be understood that the second rotor folding mechanism 223 is provided with 2 symmetrical second blade clips 2231 on the left and right sides for installing the second rotor 221 which is symmetrical to each other, and each of the second blade clips 2231 on the left and right sides is provided with a groove 2133 structure formed by a third parallel arm 22311, a fourth parallel arm 22312 and a second convex arm 22314, so that the end of the second rotor 221 can be inserted into the groove 2133 structure.

In addition, in the embodiment of the present invention, the second hub 2232 may include two second concave arms 22321, a second connecting ring 22322, a connecting shaft 22323 and two force-guiding arms 22324 for conducting driving force, the two second concave arms 22321 are symmetrically fixed on two lateral sides of the second connecting ring 22322, each second concave arm 22321 is connected to a second convex arm 22314 through a seventh connecting hole 22314, the second connecting ring 22322 is provided with an eighth connecting hole 22322 corresponding to the fourth connecting hole 2221, and the second connecting ring is sleeved on the second connecting seat, the connecting shaft sequentially passes through the eighth connecting hole and the fourth connecting hole to rotatably connect the second connecting ring and the second connecting seat; the two guide force arms are symmetrically fixed on two longitudinal sides of the second connecting ring and are respectively movably connected with the variable-pitch assembly, so that the two guide force arms are driven by the variable-pitch assembly to drive the second connecting ring to rotate around the connecting shaft.

It should also be noted that each second paddle clamp 2231 is pivotally connected to a corresponding second concave arm 22321 of the second hub 2232 by a second convex arm 22314, so that the second paddle clamp 2231 can be rotationally folded around the second concave arm 22321 (i.e., the second paddle clamp 2231) in the longitudinal direction by the pivotal connection, and at the same time, since the end portions of the two second rotors 221 are inserted into the groove 2133 structure and are also pivotally connected by a second pin 22313, the second rotor 221 can be rotationally folded in the transverse direction with respect to the second paddle clamp 2231, thereby achieving the transverse folding and the longitudinal folding of the second rotor 211 during the storage of the flight device, reducing the storage volume of the flight device, and achieving the technical effect of saving occupied space.

It is worth mentioning that in the embodiment of the utility model, in order to realize single rotor drive displacement, the utility model discloses only be connected second rotor group 22 with displacement subassembly 3 innovative, also be in two guide arm 22324 of setting up of second go-between 22322 vertical bilateral symmetry to respectively with its and displacement subassembly 3 swing joint, rotate with realization displacement subassembly drive two guide arm 22324 drive second go-between 22322.

Preferably, the first parallel arm and the second parallel arm are parallel to each other. The third parallel arm and the fourth parallel arm are parallel to each other. The folding angle of the first parallel arm and/or the second parallel arm with respect to the first concave arm is 0 ° -90 ° (can be understood as folding down 90 ° from a horizontal position). The fold angle of the third and/or fourth parallel arm relative to the second concave arm is 0 ° -90 ° (which can be understood as folding down 90 ° from a horizontal position). The folding angle of the first rotor wing relative to the first paddle clip is 0-180 ° (which can be understood as folding from the leftmost side of the horizontal position to the rightmost side of the horizontal position); the angle of folding of the second rotor relative to the second paddle clamp is 0 ° -180 ° (which can be understood as folding from the leftmost side of the horizontal position to the rightmost side of the horizontal position).

To sum up, the utility model relates to a two-way folding coaxial structure, include: the first rotor wing group, the second rotor wing group and the central fixed shaft; the first rotor wing group comprises two first rotor wings, a first connecting seat and a first rotor wing folding mechanism; the second rotor wing group also comprises two second rotor wings, a second connecting seat and a second rotor wing folding mechanism; the first connecting seat and the second connecting seat are sleeved on the central fixed shaft, and the two first rotors are symmetrically fixed on two sides of the first rotor folding mechanism so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the first rotor folding mechanism; the two second rotors are symmetrically fixed on two sides of the second rotor folding mechanism so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the second rotor folding mechanism; simultaneously the stiff end of central fixed axle passes first connecting seat, motor and second rotor group in proper order for first rotor group, second rotor group and motor use central fixed axle as the center pin symmetric distribution separately, and drive first rotor group and second rotor group respectively when rotatory around central fixed axle through the motor and rotate. The utility model discloses can realize horizontal, vertical two-way folding for have the technological effect that reduces the storage space when being applied to unmanned aerial vehicle with it.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (10)

1. A bi-directionally collapsible coaxial structure, comprising:

the first rotor wing group, the second rotor wing group and the central fixed shaft;

the first rotor wing group comprises two first rotor wings, a first connecting seat and a first rotor wing folding mechanism; the first connecting seat is sleeved on the central fixed shaft, the first rotor wing folding mechanisms are fixedly connected with the first connecting seat, and the two first rotor wings are symmetrically fixed on two sides of the first rotor wing folding mechanisms so as to respectively perform transverse folding in the transverse direction and longitudinal folding in the longitudinal direction through the first rotor wing folding mechanisms; a first threaded hole is formed in the first connecting seat;

the second rotor wing group comprises two second rotor wings, a second connecting seat and a second rotor wing folding mechanism; the second connecting seats are sleeved on the central fixed shaft, the second rotor wing folding mechanisms are fixedly connected with the second connecting seats, and the two second rotor wings are symmetrically fixed on two sides of the second rotor wing folding mechanisms so as to be transversely folded in the transverse direction and longitudinally folded in the longitudinal direction respectively through the second rotor wing folding mechanisms;

wherein, the center fixed axle has a stiff end, and passes through the stiff end passes in proper order first connector block, motor with the second rotor group makes first rotor group second rotor group reaches the motor separately with the center fixed axle is the center pin symmetric distribution, first rotor group, the symmetry of second rotor group are fixed the upper and lower terminal surface department of motor, in order to pass through the motor winds drive respectively when the center fixed axle is rotatory first rotor group with second rotor group rotates.

2. The bi-directionally collapsible coaxial structure of claim 1, wherein said first rotor folding mechanism comprises:

two first oar press from both sides, each first oar presss from both sides including first parallel arm, second parallel arm, first round pin axle and first convex arm, first connecting hole has been seted up to first parallel arm, the second connecting hole has been seted up on the second parallel arm, the third connecting hole has been seted up on the first convex arm, first parallel arm with the second parallel arm is fixed through respective tip on the first convex arm, and with first convex arm forms a groove structure, so that arbitrary one first rotor is in corresponding through its tip setting in the groove structure, and pass through first round pin axle pass in proper order first connecting hole the tip of first rotor reaches the second connecting hole, with arbitrary one first rotor and its one that corresponds first oar presss from both sides the round pin hub connection.

3. The bi-directionally collapsible coaxial structure of claim 2, wherein said first rotor folding mechanism further comprises:

the first propeller hub comprises two first concave arms and a first connecting ring, the two first concave arms are symmetrically fixed on two sides of the first connecting ring, each first concave arm corresponds to one first convex arm and is connected with the corresponding first convex arm through the third connecting hole pin shaft, a second threaded hole corresponding to the first threaded hole is formed in the first connecting ring, the first connecting ring is sleeved on the first connecting seat, and a first screw sequentially penetrates through the first threaded hole and the second threaded hole to enable the first connecting ring to be in threaded connection with the first connecting seat.

4. The bi-directionally collapsible coaxial structure of claim 3, wherein said second rotary wing collapsing mechanism comprises:

two second oar presss from both sides, each the second oar presss from both sides including third parallel arm, fourth parallel arm, second round pin axle and second convex arm, the fifth connecting hole has been seted up to the third parallel arm, the sixth connecting hole has been seted up on the fourth parallel arm, the seventh connecting hole has been seted up on the second convex arm, the third parallel arm with the fourth parallel arm is fixed through respective tip on the second convex arm, and with the second convex arm forms a groove structure, so that arbitrary one the second rotor is corresponding through its tip setting in the groove structure, and pass through the second round pin axle passes in proper order the fifth connecting hole the tip of second rotor reaches the sixth connecting hole, will arbitrary one the second rotor and its one that corresponds the second oar presss from both sides the round pin hub connection.

5. The bi-directionally collapsible coaxial structure of claim 4, wherein said second rotary wing collapse mechanism further comprises:

the second hub comprises two second concave arms, a second connecting ring, a connecting shaft and two force guide arms for conducting driving force, the two second concave arms are symmetrically fixed on two transverse sides of the second connecting ring, each second concave arm is correspondingly connected with one second convex arm through a seventh connecting hole pin shaft, and a fourth connecting hole is formed in the second connecting seat; the second connecting ring is provided with an eighth connecting hole corresponding to the fourth connecting hole, the second connecting ring is sleeved on the second connecting seat, and the connecting shaft sequentially penetrates through the eighth connecting hole and the fourth connecting hole to rotatably connect the second connecting ring and the second connecting seat; the two guide force arms are symmetrically fixed on two longitudinal sides of the second connecting ring and are respectively movably connected with the variable pitch assembly, so that the two guide force arms are driven by the variable pitch assembly to drive the second connecting ring to rotate around the connecting shaft.

6. A bi-directionally collapsible co-axial structure as claimed in claim 5, wherein:

the first parallel arm and the second parallel arm are parallel to each other.

7. A bi-directionally collapsible co-axial structure as claimed in claim 5, wherein:

the third parallel arm and the fourth parallel arm are parallel to each other.

8. A bi-directionally collapsible co-axial structure as claimed in claim 5, wherein:

the folding angle of the first parallel arm and/or the second parallel arm relative to the first concave arm is 0-90 degrees.

9. A bi-directionally collapsible co-axial structure as claimed in claim 5, wherein:

the folding angle of the third parallel arm and/or the fourth parallel arm relative to the second concave arm is 0-90 degrees.

10. A bi-directionally collapsible co-axial structure as claimed in claim 5, wherein:

the folding angle of the first rotor wing relative to the first paddle clamp is 0-180 degrees;

and/or the presence of a gas in the gas,

the folding angle of the second rotor wing relative to the second paddle clamp is 0-180 degrees.

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