阅读说明：本技术 一种用于无人机气囊加压开盖的可抛弃式口盖及其无人机 (A can abandon formula flap that is used for unmanned aerial vehicle gasbag pressurization to uncap and unmanned aerial vehicle thereof ) 是由 王浩 金龙 李嘉祥 于 2021-10-08 设计创作，主要内容包括：本发明公开一种用于无人机气囊加压开盖的可抛弃式口盖及其无人机,可抛弃式口盖包括可与无人机机体分离的口盖主体,口盖主体上设置有用于通过紧固件连接口盖主体和机体的紧固件孔,口盖主体位于紧固件孔的外侧设置有用于气囊膨胀压裂以使紧固件和机体分离的应力槽,口盖主体上还设置有用于机体和口盖主体可分离式粘接的粘接面。本发明通过应力槽断裂以及粘接面脱粘使机体和口盖主体分离,进而实现两种适用于无人机气囊加压开盖方式,只要其中任何一种开盖方式正常工作即可保证开盖顺利,从而通过双重保险的方式显著提高了开盖的成功率。该种可抛弃式口盖的开盖方式结构简单,开盖过程高效,生产成本低,适用于批量生产。(The invention discloses a disposable cover cap for an unmanned aerial vehicle air bag pressurization cover opening and an unmanned aerial vehicle thereof. The invention separates the body and the cover main body through stress groove fracture and bonding surface debonding, thereby realizing two modes of cover opening suitable for unmanned aerial vehicle airbag pressurization. The cover opening mode of the disposable cover cap is simple in structure, efficient in cover opening process, low in production cost and suitable for batch production.)

1. The utility model provides a can abandon formula flap for unmanned aerial vehicle gasbag pressurization is uncapped, include can with flap main part (1) of unmanned aerial vehicle's organism (3) separation, its characterized in that, be provided with on flap main part (1) and be used for connecting through the fastener hole of flap main part (1) and organism (3), flap main part (1) is located the outside in fastener hole is provided with and is used for gasbag inflation fracturing so that stress groove (202) of fastener and organism (3) separation, still be provided with on flap main part (1) and be used for face of bonding (201) that organism (3) and flap main part (1) detachable bond.

2. The disposable cover for the air bag pressurization cover of the unmanned aerial vehicle according to claim 1, further comprising a gasket (2) arranged in the fastener hole, wherein a stepped hole (11) is arranged on the cover body (1), the stepped hole (11) comprises a counter bore (111) facing the machine body (3) and a through hole (112) arranged at the bottom of the counter bore (111), one end of the gasket (2) is clamped in the counter bore (111), the other end of the gasket is inserted in the through hole (112), and the stress groove (202) is arranged on the periphery of the gasket (2).

3. The disposable flap for unmanned aerial vehicle air bag pressurized door release of claim 2, characterized in that the gasket (2) is provided with a cross groove (204) capable of accelerating fracture on the inner side of the stress groove (202), and the gasket (2) is divided into a plurality of breakable tabs (203) by the cross groove (204) and the stress groove (202).

4. The disposable flap for unmanned aerial vehicle air bag pressurized door opening of claim 3, characterized in that the fastener is a countersunk screw (4) and the fastener hole is a countersunk screw hole (205) that can receive a screw head of the countersunk screw (4).

5. The disposable flap for unmanned aerial vehicle airbag pressurized cover opening of claim 4, characterized in that the screw head of the countersunk screw (4), the gasket (2) are all arranged flush with the side wall of the body (3).

6. The disposable flap for unmanned aerial vehicle airbag pressurized door opening according to claim 4, characterized in that the adhesive surface (201) has a thickness H and the stress groove (202) has a thickness t, wherein H-2 t; and when the cover opening force of the single countersunk head screw (4) is 50-100N, t is 0.5-1 mm.

7. The disposable flap for unmanned aerial vehicle airbag pressurized door release of claim 4, characterized in that the maximum outer diameter of the gasket (2) satisfies:wherein, the sigma is the adhesive strength, and the unit is MPa; n is the number of the countersunk head screws (4); f is the cover opening force of a single countersunk head screw (4), and the unit is N; r is in mm.

8. An unmanned aerial vehicle, characterized in that, including organism (3), countersunk screw (4) and any of claims 4-7 the disposable flap, flap main part (1) pass through countersunk screw (4) with organism (3) are connected, be provided with the bonding on bonding face (201) the bonding material of flap main part (1) and organism (3), during the gasbag inflation, gasket (2) fracture with countersunk screw (4) separation perhaps bonding face (201) with flap main part (1) debond.

Technical Field

The invention relates to the technical field of unmanned aerial vehicles, in particular to a disposable cover cap for an unmanned aerial vehicle airbag pressurization cover and an unmanned aerial vehicle thereof.

Background

The parachute landing and the airbag landing are one of the existing landing modes adopted by many small and medium-sized unmanned aerial vehicles, the landing mode does not need a complex undercarriage system, and the compact design and the light-weight design of the unmanned aerial vehicle can be realized. The cushioning airbag is typically placed inside the fuselage with a disposable flap disposed outside of the airbag. Make the gasbag inflation through filling high-pressure air before the landing, the flap expands under the effect of inflation power and drops, finally realizes unmanned aerial vehicle's buffering landing. According to the difference of the cover opening mode, the throwable cover opening cover has two types of a mechanical cover opening scheme and a stress type cover opening scheme.

The Chinese invention patent with publication number CN 106335627A, namely a releasable cover, provides a mechanical buckle type releasable cover. The uncovering mode of the cover is a cutter or electric explosion tube removing mode, the structure is complex, the cost is high, and the cover is difficult to be suitable for the uncovering mode of the air bag. The Chinese invention patent of publication No. CN 111717374A, "an air bag landing type small and medium-sized unmanned aerial vehicle cover structure capable of being thrown", provides a cover capable of being thrown, which is fixed and opened by a rope. This flap structure occupation space is big, need set up dedicated automatically controlled rope cutter, is difficult to be applicable to the unmanned aerial vehicle structure that has the space requirement. The Chinese invention patent with publication number CN 107618652A 'a rapid detaching structure and a jacking device for a flap of an unmanned aerial vehicle', provides a mechanical cover opening mechanism for the flap of the unmanned aerial vehicle, and the mechanism or the device is mainly used for ground maintenance of the unmanned aerial vehicle, has large volume and is not suitable for a flap which can be thrown. Above three patents all belong to the mechanical type scheme of uncapping, and the mechanical type scheme of uncapping needs comparatively complicated mechanical structure to be used for connecting the flap and releasing the flap, therefore needs to occupy great space and arranges this mechanism, still needs extra control system/procedure to realize uncapping the action simultaneously.

The Chinese invention patent with publication number CN 109896030B, unmanned aerial vehicle air bag door and unmanned aerial vehicle with the same, provides a disposable air bag door scheme with a semicircular gasket pre-embedded in a door skin. This scheme needs pre-buried gasket when the flap shaping, has provided higher requirement to the location of gasket in the flap, has improved the forming process degree of difficulty, has increased manufacturing cost. In addition, the cover is opened by tearing the fiber skin through the gasket with higher strength, the covering scheme belongs to the destructive covering scheme, and the cover opening force of the cover is difficult to control, so that the cover opening reliability is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a disposable cover cap for an unmanned aerial vehicle airbag pressurization cover and an unmanned aerial vehicle thereof.

In order to solve the technical problem, the invention firstly discloses a disposable cover for an unmanned aerial vehicle air bag pressurization cover opening, which comprises a cover main body capable of being separated from a machine body of the unmanned aerial vehicle, wherein a fastener hole for connecting the cover main body and the machine body through a fastener is formed in the cover main body, a stress groove for separating the fastener and the machine body through air bag expansion and fracturing is formed in the outer side of the fastener hole of the cover main body, and a bonding surface for detachably bonding the machine body and the cover main body is further formed in the cover main body.

Further, the cover body is provided with a stepped hole, the stepped hole comprises a counter bore facing the machine body and a through hole arranged at the bottom of the counter bore, one end of the gasket is clamped in the counter bore, the other end of the gasket is inserted in the through hole, and the stress groove is formed in the circumferential direction of the gasket.

Furthermore, the gasket is provided with a cross groove capable of accelerating fracture on the inner side of the stress groove, and the gasket is divided into a plurality of fractured lugs through the cross groove and the stress groove.

Further, the fastener is a countersunk head screw, and the fastener hole is a countersunk head screw hole capable of accommodating a screw head of the countersunk head screw.

Further, the screw head and the gasket of the countersunk head screw are flush with the side wall of the machine body.

Further, the thickness of the bonding surface is H, the thickness of the stress groove is t, and H is 2 t; and when the cover opening force of a single countersunk head screw is 50-100N, t is 0.5-1 mm.

Further, the maximum outer diameter of the gasket satisfies:wherein, the sigma is the adhesive strength, and the unit is MPa; n is the number of the countersunk head screws; f is the cover opening force of a single countersunk head screw, and the unit is N; r is in mm.

Then, the invention discloses an unmanned aerial vehicle, which comprises a machine body, a countersunk screw and the disposable cover cap, wherein the cover cap main body is connected with the machine body through the countersunk screw, the bonding surface is provided with a bonding material for bonding the cover cap main body and the machine body, and when the air bag expands, the gasket is broken and is separated from the countersunk screw or the bonding surface is debonded from the cover cap main body.

Compared with the prior art, the invention has the advantages that:

the invention separates the body and the cover main body through stress groove fracture and bonding surface debonding, thereby realizing two modes of cover opening suitable for unmanned aerial vehicle airbag pressurization. The cover opening mode of the disposable cover cap is simple in structure, efficient in cover opening process, low in production cost and suitable for batch production.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:

FIG. 1 is an axial schematic view of a disposable flap for an unmanned aerial vehicle airbag pressurized door as disclosed in an embodiment of the present invention;

FIG. 2 is a schematic view of the connection of the gasket, the flap body and the countersunk head screw according to the embodiment of the present invention;

FIG. 3 is an axial view of a spacer according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a dimensional design of a gasket according to an embodiment of the disclosure;

fig. 5 is a schematic diagram of a stress groove fracture when an unmanned aerial vehicle airbag is opened by pressurization, which is disclosed by the embodiment of the invention;

fig. 6 is a schematic diagram of debonding of the bonding surface when the airbag of the unmanned aerial vehicle is opened by pressurization.

Illustration of the drawings:

1. a flap body; 11. a stepped hole; 111. a counter bore; 112. a through hole; 2. a gasket; 201. bonding surface; 202. a stress slot; 203. a tab; 204. a cross groove; 205. countersunk screw holes; 3. a body; 4. countersunk head screw.

Detailed Description

In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

As shown in fig. 1-6, the embodiment of the invention discloses a disposable flap for an unmanned aerial vehicle airbag pressurization cover opening, which comprises a flap main body 1 separable from a body 3 of the unmanned aerial vehicle, wherein a fastener hole for connecting the flap main body 1 and the body 3 through a fastener is arranged on the flap main body 1, in the embodiment, the fastener is a countersunk screw 4, the fastener hole is a countersunk screw hole 205 capable of accommodating a screw head of the countersunk screw 4, a stress groove 202 for airbag inflation and fracturing to separate the fastener from the body 3 is arranged on the outer side of the fastener hole of the flap main body 1, the structure at the stress groove 202 is relatively weak, and the stress groove 202 can break first when the airbag is inflated and pressurized. The cover body 1 is also provided with an adhesive surface 201 for detachably adhering the body 3 and the cover body 1 in parallel, and the cover body 1 can be adhered through the adhesive surface 201 when the airbag is not inflated and pressurized. Therefore, this application makes flap main part 1 separate from organism 3 through stress groove 202 fracture and bonding face 201 debond and make unmanned aerial vehicle have two kinds of gasbag pressurization modes of uncapping, as long as wherein any one of them mode of uncapping normally works and can guarantee to uncap smoothly. The success rate of uncapping is obviously improved through the mode of double insurance. In this embodiment, the flap body 1 is a carbon fiber composite flap.

Specifically, in order to form the stress groove 202 and the bonding surface 201, the circular gasket 2 provided with the fastener hole is used for realizing the method, wherein the cover body 1 is provided with the stepped hole 11, the stepped hole 11 comprises a counter bore 111 and a through hole 112 arranged at the bottom of the counter bore 111, the counter bore 111 faces the machine body 3, a flange at one end of the gasket 2 is clamped in the counter bore 111, the other end of the gasket is inserted into the through hole 112, and the stress groove 202 is formed in the circumferential direction of the gasket 2. The outer diameter of the flange at one end of the gasket 2 is smaller than the inner diameter of the counterbore 111, so that a bonding surface 201 is formed between the flange and the counterbore 111 for filling with a bonding material. Meanwhile, a cross groove 204 for accelerating fracture is arranged on the inner side of the stress groove 202 of the gasket 2, the middle part of the gasket 2 is divided into a plurality of breakable lugs 203 through the cross groove 204 and the stress groove 202, and the lugs 203 are connected with a flange at one end of the gasket 2 through the stress groove 202. When unmanned aerial vehicle gasbag pressurization was uncapped, under the effect of normal force, stress groove 202 fracture to make flap main part 1 break away from organism 3.

In this embodiment, screwhead, the gasket 2 of countersunk screw 4 all set up with the lateral wall parallel and level of organism 3 to guarantee the planarization of junction, reduce the resistance when unmanned aerial vehicle flies.

In the embodiment, the thickness of the bonding surface is H, and the thickness of the stress groove is t, where H is 2 t; and when the cover opening force of a single countersunk head screw is 50-100N, t is 0.5-1 mm. When the uncovering force of a single countersunk head screw is larger than 100N, the thickness of the stress groove is increased properly for t.

In the present embodiment, the adhesive strength between the gasket 2 and the flap body 1 is designed to finally obtain the outer dimensions of the gasket 2. Assuming that the bonding strength of the selected adhesive is σ, the effective bonding area of the bonding surface 201 is

S＝π(R²-r²)；

Where R and R are the outer and inner diameters, respectively, of the bonding surface 201. If N gaskets are uniformly distributed on each opening cover, an

Where F is the uncapping force of the disposable flap,

r＝r₀+Δ+a；

wherein r is₀Is the head diameter of the countersunk head screw 4, Delta isThe width of the circular stress groove 202, a is the distance between the countersunk head screw 4 and the circular stress groove 202, and preferably Δ is 0.5-1 mm, and a is 1.5-2 mm, so that

The maximum outer diameter of the gasket satisfies:wherein σ is adhesive strength (MPa); n is the number of the countersunk head screws; f is the cover opening force (N) of a single countersunk head screw; r is in mm.

Then, the invention discloses an unmanned aerial vehicle, which comprises a body 3, a countersunk screw 4 and the disposable flap adopting the scheme, wherein a flap main body 1 is connected with the body 3 through the countersunk screw 4, and a bonding material for bonding the flap main body 1 and the body 3 is arranged on a bonding surface 201. When the air bag expands, the gasket 2 is broken and separated from the countersunk head screw 4 or the bonding surface 201 is debonded from the opening cover main body 1, so that the opening cover can be ensured to be smooth as long as any one of the opening cover modes works normally, and the success rate of opening the cover is obviously improved through a double-insurance mode.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.