阅读说明：本技术 一种无人机机翼的折叠机构 (Folding mechanism of unmanned aerial vehicle wing ) 是由 程锋 成磊 李丹圆 徐喆 顾春辉 李晓乐 张帆 姚纳新 吴迪 崔占东 陈飞 郑 于 2020-10-23 设计创作，主要内容包括：一种无人机机翼的折叠机构,属于航空飞行器结构设计领域,针对无人机机翼展长容易受所搭载平台纵向尺寸约束问题,给出了折叠后机翼随折叠机构相对机身纵向移动,充分利用无人机纵向空间,进而增加机翼展长的技术方案。本发明的机翼折叠机构包括机构本体及纵向运动机构；本发明利用增加展长的方法增加机翼升力面积,为此类无人机(受所搭载平台纵向空间约束)在总体设计阶段赢得了设计空间。(The utility model provides a folding mechanism of unmanned aerial vehicle wing, belongs to aviation aircraft structural design field, receives the vertical size restraint problem of platform of carrying on to unmanned aerial vehicle aircraft span length easily, provides folding back wing along with folding mechanism relative fuselage longitudinal movement, make full use of unmanned aerial vehicle longitudinal space, and then increase the technical scheme of aircraft span length. The wing folding mechanism comprises a mechanism body and a longitudinal movement mechanism; the invention increases the lift area of the wing by using a method of increasing the span length, and gains design space for the unmanned aerial vehicle (constrained by the longitudinal space of the carried platform) in the overall design stage.)

1. A folding mechanism of an unmanned aerial vehicle wing is characterized by comprising a mechanism body (1), a machine body (2), a tension spring (3), a right longitudinal guide rail (4) and a left longitudinal guide rail (5);

a right longitudinal guide rail (4) and a left longitudinal guide rail (5) which are rectangular are arranged at opposite positions on the inner side of the machine body (2), and guide grooves are formed in the right longitudinal guide rail (4) and the left longitudinal guide rail (5); one end of a tension spring (3) is fixedly connected with the mechanism body (1), the other end of the tension spring is connected with a fixed rod, and the fixed rod is fixedly connected with the machine body; initially, the wings are folded on the mechanism body (1) and are longitudinally parallel to the fuselage (2), and the slight sides of the wings are restrained on the inner wall of the capsule; after the unmanned aerial vehicle is thrown, longitudinal restraint is relieved, the tension spring (3) drives the mechanism body (1) to move towards the tail direction along the right longitudinal guide rail (4) and the left longitudinal guide rail (5), the mechanism body (1) is fixed on the machine body (2) after the wings move to the longitudinal position in the flying state, and then the folding wings are transversely unfolded.

2. The folding mechanism of unmanned aerial vehicle wing of claim 1, characterized in that: the mechanism body (1) comprises a box body (6), a first spring pin (9), a second spring pin (10), a left upper cover (8), a left base (20), a right upper cover (7), a right base (19), a right rotating shaft (11), a right bearing (17), a first torsion spring (21) and a second torsion spring (22) which are positioned in the box body (6);

the box body (6) is connected with the tension spring (3), the first spring pin (9) penetrates through the box body (6) and then is in sliding connection with the guide groove of the right longitudinal guide rail (4), and the first spring pin (9) is fixedly connected with the box body (6); the second spring pin (10) penetrates through the box body (6) and then is in sliding connection with the guide groove of the left longitudinal guide rail (5), and the second spring pin (10) is fixedly connected with the box body (6);

after the left upper cover (8) is fixedly connected with the left base (20), a first cavity is formed inside the left upper cover, and the left base (20) is fixedly connected with the box body (6); after the right upper cover (7) is fixedly connected with the right base (19), a second cavity is formed inside;

the right rotating shaft (11) and the right bearing (17) are fixedly connected and then are installed in the second cavity, and the right rotating shaft (11) and the right bearing (17) can mutually rotate; a blind hole is formed in the right rotating shaft (11), the first torsion spring (21) is sleeved on the right rotating shaft (11), and one end of the first torsion spring is connected with the blind hole; a through hole is formed in the right upper cover (7), and the other end of the first torsion spring (21) is connected with the right upper cover (7) through the through hole; the left rotating shaft (12) and the left bearing (18) are fixedly connected and then are installed in the first cavity, and the left rotating shaft (12) and the left bearing (18) can mutually rotate; a blind hole is formed in the left rotating shaft (12), the second torsion spring (22) is sleeved on the left rotating shaft (12), and one end of the second torsion spring (22) is connected with the blind hole; a through hole is formed in the left upper cover (8), and the other end of the second torsion spring (22) is connected with the left upper cover (8) through the through hole;

the right rotating shaft (11) penetrates through the right upper cover (7) and is fixedly connected with the right wing; the left rotating shaft (12) penetrates through the left upper cover (8) and then is fixedly connected with the left wing.

3. The folding mechanism of unmanned aerial vehicle wing of claim 2, characterized in that: the guide groove and the machine body of the right longitudinal guide rail (4) are correspondingly provided with first through holes, the guide groove and the machine body of the left longitudinal guide rail (5) are correspondingly provided with second through holes, when the mechanism body (1) moves to the position in the tail direction along the right longitudinal guide rail (4) and the left longitudinal guide rail (5), the first spring pin (9) is inserted into the first through holes, and the second spring pin (10) is inserted into the second through holes, so that locking is realized.

4. The folding mechanism of unmanned aerial vehicle wing of claim 3, characterized in that: the mechanism body (1) further comprises a first stop block (13), a second stop block (14), a third spring pin (15) and a fourth spring pin (16);

a first stop block (13) and a second stop block (14) are arranged on two sides of the right base (19), and the first stop block (13) and the second stop block (14) are fixed on the box body (6); be equipped with the third through-hole on first dog (13), be equipped with the fourth through-hole on second dog (14), third spring catch (15) pass fourth through-hole and second dog (14) fixed connection, fourth spring catch (16) pass third through-hole and first dog (13) fixed connection, right side base (19) can be followed first dog (13) and second dog (14) and slided from top to bottom, and right side base (19) both sides set up the guide slot, are provided with the through-hole in the guide slot, right side base (19) upward movement to a fixed position after, third spring catch (15), fourth spring catch (16) card are gone into in right base (19) both sides through-hole, realize the position locking.

5. The folding mechanism of unmanned aerial vehicle wing of claim 4, characterized in that: the mechanism body (1) further comprises a base shaft (25) and a spring (26);

the base shaft (25) is fixed on the bottom surface of the box body (6), the spring (26) is sleeved on the base shaft (25), and the top end of the base shaft (25) is inserted into the cavity of the right base (19) from the bottom of the right base (19);

initially, the spring (26) is in a compressed state.

6. The folding mechanism of unmanned aerial vehicle wing of claim 5, characterized in that: the top of the right rotating shaft (11) is fixedly connected with a fan-shaped piece, the left upper cover (8) is provided with an ear piece, and initially, the fan-shaped piece is positioned below the ear piece and restricts the upward movement of the right base (19) through the ear piece.

7. The folding mechanism of unmanned aerial vehicle wing of claim 6, characterized in that: the central angle of the segment is 90 deg.

8. The folding mechanism of unmanned aerial vehicle wing of claim 2, characterized in that: a first wing spring pin (23) is arranged on the left upper cover (8) and used for limiting and locking the left wing after the left wing is unfolded in place.

9. The folding mechanism of unmanned aerial vehicle wing of claim 2, characterized in that: and a second wing spring pin (24) is arranged on the right upper cover (7) and used for limiting and locking the right wing after the right wing is unfolded in place.

10. A method for unfolding a folding mechanism of an unmanned aerial vehicle wing is characterized by comprising the following steps:

after the unmanned aerial vehicle is thrown, the longitudinal restraint of the wings is released, the box body (6) is driven by elastic potential energy stored in the tension spring (3) to drive the wings to expand towards the longitudinal position in a flight state, and after the wings move in place longitudinally, the box body (6) is fixedly connected with the machine body (2) through the first spring pin (9) and the second spring pin (10);

step two, the right rotating shaft (11) drives the right wing to transversely unfold to the right side under the action of a first torsion spring (21), the left rotating shaft (12) drives the left wing to transversely unfold to the left side under the action of a second torsion spring (22), after the wing is transversely unfolded in place, the first wing spring pin (23) carries out limit locking on the left wing, and the second wing spring pin (23) carries out limit locking on the right wing;

in the wing unfolding process, the lug on the left upper cover (8) restricts the movement of the right wing in the direction of the back of the aircraft through the fan-shaped piece on the right rotating shaft (11);

and step three, after the wings are transversely unfolded in place and locked, the lug plates release the restraint of the fan-shaped sheets, the spring (26) drives the right base (19) to drive the right wing to move towards the machine back direction, so that the left wing and the right wing are symmetrical in the height direction, and after the right wing finishes moving towards the machine back direction, the fixed connection between the wings and the machine body is realized through the third spring pin (15) and the fourth spring pin (16).

Technical Field

The invention relates to a folding mechanism of wings of an unmanned aerial vehicle, and belongs to the field of overall structural design of an aviation aircraft.

Background

The wings of the unmanned aerial vehicle delivered and spread to the upper air of a war zone by a barrel artillery or a short-range missile generally need to be folded, and the folded wings are generally divided into inflatable wings and non-inflatable wings. Because of the constraints of the delivery platform, the wings of the drone generally need to fold within the transverse envelope of the fuselage (this constraint mostly comes from the platform itself on which it is mounted). The space of the folded inflatable wing is far smaller than the volume of the unfolded inflatable wing, and the inflatable wing can be directly folded in the fuselage. Non-inflatable wings typically allow folding of the wing sections within the fuselage envelope, or folding of the wing as a whole (left and right wings are integral, respectively) in the direction of the longitudinal axis of the fuselage.

Most of the existing products at home and abroad adopt the idea that wings are folded towards the longitudinal axis direction of a fuselage so as to reduce the dependence on the transverse space of an aircraft. The wing folding scheme has the characteristics of simple folding mechanism design, high reliability and the like. However, in this solution, the wing chord length is enveloped and constrained by the inner wall of the embarkation platform, and the wing span length is constrained by the longitudinal position of the wing in the whole aircraft, so that it is difficult to increase the lift of the whole aircraft by increasing the lift area of the wing.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the folding mechanism of the wing of the unmanned aerial vehicle is provided, the longitudinal movement of the wing relative to the body is utilized, the wing unfolding design space is increased, and then the wing lifting area is increased.

The technical solution of the invention is as follows:

a folding mechanism of an unmanned aerial vehicle wing comprises a mechanism body, a machine body, a tension spring, a right longitudinal guide rail and a left longitudinal guide rail;

the right longitudinal guide rail and the left longitudinal guide rail are rectangular and are provided with guide grooves; one end of the tension spring is fixedly connected with the mechanism body, the other end of the tension spring is connected with a fixed rod, and the fixed rod is fixedly connected with the machine body; initially, the wings are folded on the mechanism body and are longitudinally parallel to the fuselage, and the slight sides of the wings are restrained on the inner wall of the missile compartment; after the unmanned aerial vehicle is thrown, longitudinal restraint is relieved, the tension spring drives the mechanism body to move towards the tail direction along the right longitudinal guide rail and the left longitudinal guide rail, after the wings move to the longitudinal position in the flying state, the mechanism body is fixed on the machine body, and then the folding wings are transversely unfolded.

The mechanism body comprises a box body, and a first spring pin, a second spring pin, a left upper cover, a left base, a right upper cover, a right base, a right rotating shaft, a right bearing, a first torsion spring and a second torsion spring which are positioned in the box body;

the box body is connected with the tension spring, the first spring pin penetrates through the box body and then is in sliding connection with the guide groove of the right longitudinal guide rail, and the first spring pin is fixedly connected with the box body; the second spring pin penetrates through the box body and then is in sliding connection with the guide groove of the left longitudinal guide rail, and the second spring pin is fixedly connected with the box body;

after the left upper cover is fixedly connected with the left base, a first cavity is formed inside the left upper cover, and the left base is fixedly connected with the box body; after the right upper cover is fixedly connected with the right base, a second cavity is formed inside the right upper cover;

the right rotating shaft and the right bearing are fixedly connected and then are installed in the second cavity, and the right rotating shaft and the right bearing can mutually rotate; the right rotating shaft is provided with a blind hole, the first torsion spring is sleeved on the right rotating shaft, and one end of the first torsion spring is connected with the blind hole; the right upper cover is provided with a through hole, and the other end of the first torsion spring is connected with the right upper cover through the through hole; the left rotating shaft and the left bearing are fixedly connected and then are installed in the first cavity, and the left rotating shaft and the left bearing can mutually rotate; the left rotating shaft is provided with a blind hole, the second torsion spring is sleeved on the left rotating shaft, and one end of the second torsion spring is connected with the blind hole; the left upper cover is provided with a through hole, and the other end of the second torsion spring is connected with the left upper cover through the through hole;

the right rotating shaft penetrates through the right upper cover and is fixedly connected with the right wing; and the left rotating shaft penetrates through the left upper cover and is fixedly connected with the left wing.

The guide groove and the machine body of the right longitudinal guide rail are correspondingly provided with first through holes, the guide groove and the machine body of the left longitudinal guide rail are correspondingly provided with second through holes, when the mechanism body moves in place along the right longitudinal guide rail and the left longitudinal guide rail towards the tail direction, the first spring pin is inserted into the first through holes, and the second spring pin is inserted into the second through holes, so that locking is realized.

The mechanism body also comprises a first stop block, a second stop block, a third spring pin and a fourth spring pin;

a first stop block and a second stop block are arranged on two sides of the right base and fixed on the box body; be equipped with the third through-hole on the first dog, be equipped with the fourth through-hole on the second dog, third spring catch passes fourth through-hole and second dog fixed connection, and fourth spring catch passes third through-hole and first dog fixed connection, and right base can slide from top to bottom along first dog and second dog, and right base both sides set up the guide slot, is provided with the through-hole in the guide slot, and right base upward movement is to a certain position after, third spring catch, fourth spring catch card are gone into in the through-hole of right base both sides, realize the position locking.

The mechanism body also comprises a base shaft and a spring;

the base shaft is fixed on the bottom surface of the box body, the spring is sleeved on the base shaft, and the top end of the base shaft is inserted into the cavity of the right base from the bottom of the right base;

initially, the spring is in a compressed state.

The top of the right rotating shaft is fixedly connected with a fan-shaped piece, the left upper cover is provided with an ear piece, and initially, the fan-shaped piece is positioned below the ear piece and restrains the upward movement of the right base through the ear piece.

The central angle of the segment is 90 deg.

And a first wing spring pin is arranged on the upper left cover and used for limiting and locking the left wing after the left wing is unfolded in place.

And a second wing spring pin is arranged on the right upper cover and used for limiting and locking the right wing after the right wing is unfolded in place.

A method for unfolding a folding mechanism of an unmanned aerial vehicle wing comprises the following steps:

after the unmanned aerial vehicle is thrown, the longitudinal restraint of the wings is released, the box body is driven by elastic potential energy stored by the tension spring to drive the wings to expand towards the longitudinal position in a flying state, and the box body is fixedly connected with the machine body by the first spring pin and the second spring pin after the wings move in place longitudinally;

step two, the right rotating shaft drives the right wing to transversely unfold to the right side under the action of a first torsion spring, the left rotating shaft drives the left wing to transversely unfold to the left side under the action of a second torsion spring, after the wings are transversely unfolded in place, the left wing is limited and locked by a first wing spring pin, and the right wing is limited and locked by a second wing spring pin;

in the wing unfolding process, the lug on the left upper cover restricts the movement of the right wing in the direction of the back of the aircraft through the fan-shaped piece on the right rotating shaft;

and step three, after the wings are transversely unfolded in place and locked, the lug plates release the restraint of the fan-shaped plates, the spring drives the right base to drive the right wing to move towards the machine back direction, so that the left wing and the right wing are symmetrical in the height direction, and after the right wing finishes moving towards the machine back direction, the fixed connection between the wings and the machine body is realized through the third spring pin and the fourth spring pin.

Compared with the prior art, the invention has the following beneficial effects:

(1) the longitudinal position of the wing root of the wing is different when the wing is folded and unfolded, and the longitudinal space of the fuselage is fully utilized, so that the aims of increasing the wing span direction design space and increasing the lifting area of the wing are fulfilled under the condition that the wing chord length is not changed.

(2) The invention realizes larger lift force requirement under the same design space;

(3) the wing folding mechanism adopts an integrated design method, optimizes the design space and reduces the extra mass.

Drawings

FIG. 1 is an overall view of a wing folding mechanism;

FIG. 2 is an internal view of a wing fold mechanism;

FIG. 3 is a connection diagram of the right rotating shaft, the first torsion spring, the fourth spring pin and the right base;

FIG. 4 is a diagram showing the connection relationship between the first wing spring pin and the right base; a relation diagram of the right rotating shaft and the left upper cover;

FIG. 5 is a connection view of the base shaft, spring, and right base;

FIG. 6 is a diagram of the fourth spring pin in relation to the right base.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention starts from the difference of the longitudinal positions of the fuselage of the wing before folding (in an unfolding state) and the wing root after folding, and increases the design space of the wing span length, thereby achieving the purpose of increasing the lifting area of the wing.

The working principle of the design scheme of the whole unmanned aerial vehicle wing folding mechanism is as follows:

the unmanned aerial vehicle utilizes the delivery platform to spread to the sky above the task area, and before scattering, the wing is loaded in carrying on the platform with folding form. The wing chord length is enveloped and restrained by the inner wall of the carrying platform, the wing span length is restrained by the longitudinal position of the wing in the whole aircraft, and the whole aircraft lift is difficult to increase by increasing the lift area of the wing. The invention starts from the difference of the longitudinal positions of the machine body where the wing root is positioned before and after the wing is folded, fully utilizes the longitudinal space of the machine body and the wingspan length design potential of the excavator, thereby achieving the purpose of increasing the lifting area of the wing.

The folding mechanism comprises a mechanism body and a longitudinal movement mechanism. As shown in fig. 1 to 6, the longitudinal movement mechanism includes a mechanism body 1, a machine body 2, a tension spring 3, a right longitudinal guide rail 4, and a left longitudinal guide rail 5.

The right longitudinal guide rail 4 and the left longitudinal guide rail 5 which are rectangular are arranged at opposite positions on the inner side of the machine body 2, and guide grooves are formed in the right longitudinal guide rail 4 and the left longitudinal guide rail 5. One end of the tension spring 3 is fixedly connected with the mechanism body 1, the other end of the tension spring is connected with a fixed rod, and the fixed rod is fixedly connected with the machine body. Initially, the wings are folded on the mechanism body 1 and are longitudinally parallel to the fuselage 2, and the slight sides of the wings are restrained on the inner wall of the missile cabin.

After the unmanned aerial vehicle is thrown, longitudinal restraint is relieved, the tension spring 3 drives the mechanism body 1 to move towards the tail direction along the right longitudinal guide rail 4 and the left longitudinal guide rail 5, after the wings move to the longitudinal position in the flying state, the mechanism body 1 is fixed on the machine body 2, and then the folded wings are transversely unfolded.

The mechanism body 1 comprises a box body 6, and a first spring pin 9, a second spring pin 10, a left upper cover 8, a left base 20, a right upper cover 7, a right base 19, a right rotating shaft 11, a right bearing 17, a first torsion spring 21, a second torsion spring 22, a first stopper 13, a second stopper 14, a third spring pin 15, a fourth spring pin 16, a base shaft 25, a spring 26, a first wing spring pin 23 and a second wing spring pin 24 which are positioned in the box body 6.

The box body 6 is connected with the tension spring 3, the first spring pin 9 penetrates through the box body 6 and then is in sliding connection with the guide groove of the right longitudinal guide rail 4, and the first spring pin 9 is fixedly connected with the box body 6; the second spring pin 10 passes through the box body 6 and then is connected with the guide groove of the left longitudinal guide rail 5 in a sliding way, and the second spring pin 10 is fixedly connected with the box body 6.

After the left upper cover 8 is fixedly connected with the left base 20, a first cavity is formed inside the left upper cover, and the left base 20 is fixedly connected with the box body 6; after the right upper cover 7 is fixedly connected with the right base 19, a second cavity is formed inside. The right rotating shaft 11 and the right bearing 17 are fixedly connected and then are installed in the second cavity, and the right rotating shaft 11 and the right bearing 17 can mutually rotate; a blind hole is formed in the right rotating shaft 11, the first torsion spring 21 is sleeved on the right rotating shaft 11, and one end of the first torsion spring is connected with the blind hole; a through hole is formed in the right upper cover 7, and the other end of the first torsion spring 21 is connected with the right upper cover 7 through the through hole; the left rotating shaft 12 and the left bearing 18 are fixedly connected and then are installed in the first cavity, and the left rotating shaft 12 and the left bearing 18 can mutually rotate; a blind hole is formed in the left rotating shaft 12, the second torsion spring 22 is sleeved on the left rotating shaft 12, and one end of the second torsion spring 22 is connected with the blind hole; the left upper cover 8 is provided with a through hole, and the other end of the second torsion spring 22 is connected with the left upper cover 8 through the through hole. The right rotating shaft 11 penetrates through the right upper cover 7 and is fixedly connected with the right wing; and the left rotating shaft 12 penetrates through the left upper cover 8 and is fixedly connected with the left wing.

The right bearing 17 is connected with the right base 19, the left bearing 18 is connected with the left base 20 in an interference mode, the right rotating shaft 11 is connected with the right bearing 17, and the left rotating shaft 12 is connected with the left bearing 18; the right rotary shaft 11 is rotatable based on the right base 19, and the left rotary shaft 12 is rotatable based on the left base 20. The first torsion spring 21 is connected with the right upper cover 7 and drives the right rotating shaft 11 to rotate to the wing unfolding position. The second torsion spring 22 is connected with the left upper cover 8 and drives the left rotating shaft 12 to rotate to the wing unfolding position.

The guide groove and the machine body of the right longitudinal guide rail 4 are correspondingly provided with first through holes, the guide groove and the machine body of the left longitudinal guide rail 5 are correspondingly provided with second through holes, when the mechanism body 1 moves in place along the right longitudinal guide rail 4 and the left longitudinal guide rail 5 towards the tail direction, the first spring pin 9 is inserted into the first through holes, and the second spring pin 10 is inserted into the second through holes, so that locking is realized.

A first stop block 13 and a second stop block 14 are arranged on two sides of the right base 19, and the first stop block 13 and the second stop block 14 are fixed on the box body 6; be equipped with the third through-hole on the first dog 13, be equipped with the fourth through-hole on the second dog 14, third spring catch 15 passes fourth through-hole and second dog 14 fixed connection, and fourth spring catch 16 passes third through-hole and first dog 13 fixed connection, third spring catch 15, fourth spring catch 16 with right side base 19 sliding connection, right side base 19 can be followed first dog 13 and second dog 14 and slided from top to bottom promptly, and the 19 both sides of right side base set up the guide slot, is provided with the through-hole in the guide slot, and right side base 19 upwards moves to a certain position after, third spring catch 15, fourth spring catch 16 card are gone into in the 19 both sides through-hole of right side base, realize the position locking. The first stopper 13 and the second stopper 14 are fixedly connected with the box body 6, and play a role in restraining the right base 19 and connecting the third spring pin 15 and the fourth spring pin 16.

The base shaft 25 is fixed on the bottom surface of the box body 6, the spring 26 is sleeved on the base shaft 25, and the top end of the base shaft 25 is inserted into the cavity of the right base 19 from the bottom of the right base 19; initially, the spring 26 is in a compressed state. After the unmanned aerial vehicle is scattered, the right rotating shaft 11 rotates 90 degrees towards the wing unfolding position, the vertical constraint of the right base 19 is released, the elastic potential energy stored by the spring 26 drives the right base 19 to the height below the wing unfolding position, and the right base is locked and limited by the third spring pin 15 and the fourth spring pin 16.

The top of the right rotating shaft 11 is fixedly connected with a fan-shaped piece, the left upper cover 8 is provided with an ear piece, and initially, the fan-shaped piece is positioned below the ear piece and restricts the upward movement of the right base 19 through the ear piece. The central angle of the segment is 90 deg.

And a first wing spring pin 23 is arranged on the left upper cover 8 and used for limiting and locking the left wing after the left wing is unfolded in place. And a second wing spring pin 24 is arranged on the right upper cover 7 and used for limiting and locking the right wing after the right wing is unfolded in place.

The box body 6 moves towards the wing unfolding direction along the right longitudinal guide rail 4 and the left longitudinal guide rail 5 under the action of the tension spring 3; after the wings move to the longitudinal position in the flying state, the first spring pin 9 and the second spring pin 10 are respectively clamped into the through holes on the two sides of the fuselage 2.

The base shaft 25 is fixed on the bottom surface of the box body 6, the spring 26 is sleeved on the base shaft 25, and the top end of the base shaft 25 is inserted into the cavity of the right base 19 from the bottom of the right base 19. Initially, the spring 26 is in a compressed state.

The invention designs that the wing unfolding process comprises three degrees of freedom movement, namely: 1) the box body 6 moves longitudinally along the right longitudinal guide rail 4 and the left longitudinal guide rail 5; 2) the left wing and the right wing respectively rotate around a left rotating shaft 12 and a right rotating shaft 11; 3) the right wing moves in the vertical (back) direction of the base shaft 25. The folding wings are unfolded to a normal flight state after the last three movements are finished. The motion 1) is finished, and the longitudinal position of the wing is limited and locked by a first spring pin 9 and a second spring pin 10, so that the problem of unfolding of the longitudinal position of the wing is solved; the first wing spring pin 23 and the second wing spring pin 24 are used for limiting and locking after the movement 2) is finished, and the problem that the wings are unfolded normally (transversely) from the longitudinal folding is solved; and 3) after the movement is finished, the third spring pin 15 and the fourth spring pin 16 are used for limiting and locking, and the problem that the left wing and the right wing are symmetrical in the machine back direction is solved (the left wing and the right wing are kept in an up-down state when being folded due to space constraint). Motion 1) is driven by a tension spring 3; motion 2) driven by the first torsion spring 21, the second torsion spring 22; movement 3) is driven by spring 26. The movement 1) and the movement 2) do not interfere with each other, the surfaces of wings are irregular, and in order to avoid the failure of unfolding caused by friction force generated by the contact of the wings in the movement 2), the right rotating shaft 11 and the left upper cover 8 are respectively provided with a sector surface and a lug, and the design ensures that the movement 3) starts to move after the movement 2) is finished. During wing deployment, the left wing performs movements 1) and 2), and the right wing performs movements 1), 2), and 3). The motion 1) and the motion 3) are linear motion and adopt a guide rail/guide groove mechanism form; the motion 2) is a rotational motion, which takes the form of a bearing mechanism. The motion 1), the motion 2) and the motion 3) are driven by elastic potential energy.

The specific implementation process of the invention is as follows:

1) after the delivery platform and the unmanned aerial vehicle are separated, the longitudinal restraint of the wing is released, the elastic potential energy stored by the tension spring 3 in the figure 2 drives the box body 6 to drive the wing to expand towards the longitudinal position in the flying state, and after the wing moves in place towards the longitudinal direction, the box body 6 is fixedly connected with the machine body 2 through the first spring pin 9 and the second spring pin 10. One end of the tension spring 3 is connected with the box body 6, and the other end is connected with the machine body.

2) After the delivery platform and the unmanned aerial vehicle are separated, the wings are transversely restrained and released, in the figure 2, the wings are driven to transversely expand by the right rotating shaft 11 and the left rotating shaft 12 under the action of the first torsion spring 21 and the second torsion spring 22, and after the wings are transversely expanded in place, the wings are fixedly connected with the right upper cover 7 and the left upper cover 8 through the first wing spring pin 23 and the second wing spring pin 24. During the movement, the lug on the left upper cover 8 restricts the movement of the right wing in the direction of the machine back through the fan-shaped piece on the right rotating shaft 11. As shown in fig. 4.

3) After the wings are transversely unfolded in place and locked, the constraint of the right wing in the machine back direction is released, the spring 26 drives the right base 19 to drive the right wing to move in the machine back direction, so that the left wing and the right wing are symmetrical in the height direction (the machine back direction), and after the movement of the right wing in the machine back direction is finished, the wings and the machine body are fixedly connected through the third spring pin 15 and the fourth spring pin 16. The first and second stoppers 13 and 14 function as guide rails during this movement. As shown in fig. 3, 5, 6.

In the rotating process of the right rotating shaft 11 and the left rotating shaft 12, the sector on the right rotating shaft 11 is 90 degrees, and after the wing rotates 90 degrees from the longitudinal direction to the transverse direction, the sector on the right rotating shaft 11 is in surface contact with the lug plate of the left upper cover 8, so that the constraint is released. As shown in fig. 4.

The invention provides a technical scheme that after folding, wings move longitudinally along with a folding mechanism relative to a machine body, longitudinal space of an unmanned aerial vehicle is fully utilized, and further span length of the unmanned aerial vehicle is increased, aiming at the problem that span length of the unmanned aerial vehicle is easily restricted by longitudinal size of a carried platform. The wing folding mechanism comprises a mechanism body and a longitudinal movement mechanism; the invention increases the lift area of the wing by using a method of increasing the span length, and gains design space for the unmanned aerial vehicle (constrained by the longitudinal space of the carried platform) in the overall design stage.

The design of the invention widens the general design scheme thought of the unmanned aerial vehicle, and partially solves the constraint problem about effective load and time of flight in the general design.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above, and therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the present invention.