阅读说明：本技术 复合材料薄壳平面折展装置及收展方法 (Composite material thin shell plane folding and unfolding device and folding and unfolding method ) 是由 王冰 杨潮 钟舜聪 于 2021-10-25 设计创作，主要内容包括：本发明涉及一种复合材料薄壳平面折展装置及收展方法,包括复合材料薄壳、折展机构、末端支撑臂,折展机构安装在复合材料薄壳一侧边,末端支撑臂安装在复合材料薄壳折展机构安装位的对侧边上；复合材料薄壳包含结构层和连接层,结构层由至少两段圆弧双稳态复合材料卷尺结构并列组成,连接层为柔性薄膜或织物粘结在结构层的单侧或双侧表面；折展机构包括侧板、首端支撑臂、第一限位杆、第二限位杆；末端支撑臂由至少两节外伸缩杆依次连接构成,外伸缩杆安装在固定在复合材料薄壳末端的凸面上；本装置在展开与折叠状态下都能保持稳定且能重复折叠展开,空间利用率高、结构简单、比强度和比模量大、耐高温、耐腐蚀,能满足复杂多变的工作环境。(The invention relates to a composite material thin shell plane folding and unfolding device and a folding and unfolding method, wherein the composite material thin shell plane folding and unfolding device comprises a composite material thin shell, a folding and unfolding mechanism and a tail end supporting arm, wherein the folding and unfolding mechanism is arranged on one side edge of the composite material thin shell, and the tail end supporting arm is arranged on the opposite side edge of the installation position of the composite material thin shell folding and unfolding mechanism; the composite material thin shell comprises a structural layer and a connecting layer, wherein the structural layer is formed by at least two sections of arc bistable composite material tape structures in parallel, and the connecting layer is formed by bonding a flexible film or fabric on the surface of one side or both sides of the structural layer; the folding and unfolding mechanism comprises a side plate, a head end supporting arm, a first limiting rod and a second limiting rod; the tail end supporting arm is formed by sequentially connecting at least two sections of outer telescopic rods, and the outer telescopic rods are arranged on a convex surface fixed at the tail end of the composite material thin shell; this device can both remain stable and can repeated folding expansion under expansion and fold condition, and space utilization is high, simple structure, specific strength and specific modulus are big, high temperature resistant, corrosion-resistant, can satisfy complicated changeable operational environment.)

1. The utility model provides a combined material thin shell plane folding and unfolding device which characterized in that: the folding and unfolding mechanism is arranged on one side of the composite material thin shell, and the tail end supporting arm is arranged on the opposite side of the installation position of the composite material thin shell folding and unfolding mechanism;

the composite material thin shell comprises a structural layer and a connecting layer, wherein the structural layer is formed by at least two sections of arc bistable composite material tape structures in parallel, the connecting layer is formed by bonding a flexible film or fabric on one side or two side surfaces of the structural layer, and the structural layers are connected into a whole;

the folding and unfolding mechanism comprises side plates, a head end supporting arm, a first limiting rod and a second limiting rod, the number of the side plates is two, the head end supporting arm, the first limiting rod and the second limiting rod are positioned between the two side plates, the head end supporting arm, the first limiting rod and the second limiting rod are distributed in a triangular shape, the first limiting rod and the second limiting rod are telescopic rods, two ends of the first limiting rod are fixedly connected with the side plates, the second limiting rod is accommodated in a straight slot of the side plates, the end part of the second limiting rod is connected with the side plates through a tension spring, the head end supporting arm is formed by sequentially connecting at least two sections of inner telescopic rods, and the inner telescopic rods are installed on a concave surface fixed at the head end of the thin shell made of composite material;

the tail end supporting arm is formed by sequentially connecting at least two sections of outer telescopic rods, and the outer telescopic rods are arranged on a convex surface fixed at the tail end of the composite material thin shell.

2. The composite shell plane folding and unfolding device according to claim 1, characterized in that: the radian of the structural layer is alpha, and the alpha is not less than one sixth pi and not more than pi.

3. The composite shell plane folding and unfolding device according to claim 1, characterized in that: the side plate is provided with mounting round holes A for mounting the support arms, mounting round holes B for mounting the first limiting rods and straight slotted holes for mounting the second limiting rods, wherein the mounting round holes A are distributed in a triangular manner.

4. The composite shell plane folding and unfolding device according to claim 1, characterized in that: the ratio of the thickness to the radius of curvature of the bi-stable composite tape structure in the structural layer is less than 1/20.

5. The composite shell plane folding and unfolding device according to claim 1, characterized in that: the inner telescopic rods are connected with the composite material thin shell through the long stand columns on the inner telescopic rods, and the outer telescopic rods are connected with the composite material thin shell through the short stand columns on the outer telescopic rods.

6. The composite shell plane folding and unfolding device according to claim 5, characterized in that: the fixing points of the long upright posts, the short upright posts and the composite material thin shell are uniformly distributed along the width direction.

7. The composite shell plane folding and unfolding device according to claim 5, characterized in that: the length of the long upright column is LThe length of the short upright post is L, and L is less than L; wherein d is_{Inner part}The inner diameter of the composite material thin shell after being folded; d_HeadThe diameter of the inner telescopic rod in the head end supporting arm.

8. The composite material thin shell plane folding and unfolding device as claimed in claim 5, wherein the edge of the mounting round hole A on the side plate is at a minimum distance S from the center of the straight slot hole₁₃Is composed ofMinimum difference Δ h in height direction₁₃Is composed ofThe minimum distance S between the edge of the mounting round hole B and the center of the straight slotted hole₂₃Is composed ofThe minimum difference value of the edge of the mounting round hole A and the edge of the mounting round hole B in the height direction is delta h₁₂Is, Δ h₁₂Not less than h; wherein d is_{Outer cover}The outer diameter of the composite material thin shell in a folded state; h is the height of the composite material thin shell in the unfolding state; delta is the thickness of the composite shell.

9. The composite shell plane folding and unfolding device according to claim 1, characterized in that: the first limiting rod, the second limiting rod, the head end supporting arm and the tail end supporting arm are all telescopic distances delta l, and delta l is alpha (alpha r-2rsin alpha); where r is the radius of the bistable composite tape construction.

10. A folding and unfolding method using the composite material thin shell plane folding and unfolding device as claimed in claim 1, which comprises the following steps:

winding: in an unfolded state, the head end supporting arm rotates towards the direction of the convex surface of the composite material thin shell, the composite material thin shell rotates along with the composite material thin shell and generates elastic bending deformation when contacting with the first limiting rod, then the composite material thin shell is gradually curled into a cylindrical shape under the action of bending moment and pushes the second limiting rod to slide towards the direction far away from the head end supporting arm, the elongation of the extension spring is increased, and the second limiting rod is tightly attached to the composite material thin shell; when the tail end supporting arm is contacted with the first limiting rod, the device is converted into a folded state and is kept stable, and meanwhile, the first limiting rod, the second limiting rod, the head end supporting arm and the tail end supporting arm extend to the longest state, wherein the extension amount is the increase amount of the folded width of the composite material thin shell;

unfolding: under fold condition, rotate the head end support arm to second gag lever post place direction, the combined material thin shell under fold condition rotates thereupon and takes place elastic deformation then reply gradually to the expansion state when terminal support arm contacts the second gag lever post, and first gag lever post, second gag lever post, head end support arm and terminal support arm all shorten to the shortest state simultaneously.

Technical Field

The invention relates to the technical field of mechanical structures, in particular to a composite material thin shell plane folding and unfolding device and a folding and unfolding method.

Background

Large area flat panels or frame structures (e.g., solar wing substrates, large display backplanes) are required in some mobile large devices/installations. For ease of transport, these panel or frame structures meet strength requirements while being lightweight and collapsible. The traditional scheme is that the folding and unfolding mechanism is divided into a plurality of small-area plates or frames, deformation is completed through mechanical assembly or folding, and the structures are often complex, more parts and components are provided, the weight is large, and repeated folding and unfolding is difficult to realize.

Disclosure of Invention

The invention aims to provide a composite material thin shell plane folding and unfolding device and a folding and unfolding method by utilizing the characteristics of high specific strength, high containing efficiency and the like of a composite material thin shell.

The invention solves the technical problem by adopting the scheme that the composite material thin shell plane folding and unfolding device comprises a composite material thin shell, a folding and unfolding mechanism and a tail end supporting arm, wherein the folding and unfolding mechanism is arranged on one side edge of the composite material thin shell, and the tail end supporting arm is arranged on the opposite side edge of the installation position of the composite material thin shell folding and unfolding mechanism;

the composite material thin shell comprises a structural layer and a connecting layer, wherein the structural layer is formed by at least two sections of arc bistable composite material tape structures in parallel, the connecting layer is formed by bonding a flexible film or fabric on one side or two side surfaces of the structural layer, and the structural layers are connected into a whole;

the folding and unfolding mechanism comprises side plates, a head end supporting arm, a first limiting rod and a second limiting rod, the number of the side plates is two, the head end supporting arm, the first limiting rod and the second limiting rod are positioned between the two side plates, the head end supporting arm, the first limiting rod and the second limiting rod are distributed in a triangular shape, the first limiting rod and the second limiting rod are telescopic rods, two ends of the first limiting rod are fixedly connected with the side plates, the second limiting rod is accommodated in a straight slot of the side plates, the end part of the second limiting rod is connected with the side plates through a tension spring, the head end supporting arm is formed by sequentially connecting at least two sections of inner telescopic rods, and the inner telescopic rods are installed on a concave surface fixed at the head end of the thin shell made of composite material;

the tail end supporting arm is formed by sequentially connecting at least two sections of outer telescopic rods, and the outer telescopic rods are arranged on a convex surface fixed at the tail end of the composite material thin shell.

Furthermore, the radian of the structural layer is alpha, and the alpha is not less than one sixth pi and not more than pi.

Furthermore, the side plate is provided with a mounting round hole A for mounting the support arm, a mounting round hole B for mounting the first limiting rod and a straight slot hole for mounting the second limiting rod, wherein the mounting round hole A, the mounting round hole B and the straight slot hole are distributed in a triangular manner.

Further, the ratio of the thickness to the radius of curvature of the bi-stable composite tape structure in the structural layer is less than 1/20.

Further, the inner telescopic rods are connected with the composite material thin shell through the long stand columns on the inner telescopic rods, and the outer telescopic rods are connected with the composite material thin shell through the short stand columns on the outer telescopic rods.

Furthermore, the fixing points of the long upright posts, the short upright posts and the composite material thin shell are uniformly distributed along the width direction.

Further, the length of the long upright post is LThe length of the short upright post is L, and L is less than L; wherein d is_{Inner part}The inner diameter of the composite material thin shell after being folded; d_HeadThe diameter of the inner telescopic rod in the head end supporting arm.

Furthermore, the side plate is provided with a minimum distance S between the edge of the round hole A and the circle center of the straight slotted hole₁₃Is composed ofMinimum difference Δ h in height direction₁₃Is composed ofThe minimum distance S between the edge of the mounting round hole B and the center of the straight slotted hole₂₃Is composed ofThe minimum difference value of the edge of the mounting round hole A and the edge of the mounting round hole B in the height direction is delta h₁₂Is, Δ h₁₂Not less than h; wherein d is_{Outer cover}The outer diameter of the composite material thin shell in a folded state; h is the height of the composite material thin shell in the unfolding state; delta is the thickness of the composite shell.

Furthermore, the first limiting rod, the second limiting rod, the head end supporting arm and the tail end supporting arm are all extended and retracted distances delta l, and delta l is alpha (alpha r-2rsin alpha); where r is the radius of the bistable composite tape construction.

A folding and unfolding method adopts a composite material thin shell plane folding and unfolding device:

winding: in an unfolded state, the head end supporting arm rotates towards the direction of the convex surface of the composite material thin shell, the composite material thin shell rotates along with the composite material thin shell and generates elastic bending deformation when contacting with the first limiting rod, then the composite material thin shell is gradually curled into a cylindrical shape under the action of bending moment and pushes the second limiting rod to slide towards the direction far away from the head end supporting arm, the elongation of the extension spring is increased, and the second limiting rod is tightly attached to the composite material thin shell; when the tail end supporting arm is contacted with the first limiting rod, the device is converted into a folded state and is kept stable, and meanwhile, the first limiting rod, the second limiting rod, the head end supporting arm and the tail end supporting arm extend to the longest state, wherein the extension amount is the increase amount of the folded width of the composite material thin shell;

unfolding: under fold condition, rotate the head end support arm to second gag lever post place direction, the combined material thin shell under fold condition rotates thereupon and takes place elastic deformation then reply gradually to the expansion state when terminal support arm contacts the second gag lever post, and first gag lever post, second gag lever post, head end support arm and terminal support arm all shorten to the shortest state simultaneously.

Compared with the prior art, the invention has the following beneficial effects: the folding and unfolding structure can be stably kept and can be repeatedly folded and unfolded under the unfolding and folding conditions, has the advantages of high space utilization rate, simple structure, high specific strength and specific modulus, high temperature resistance, corrosion resistance and the like, and can meet the complicated and variable working environment.

Drawings

The invention is further described with reference to the following figures.

Figure 1 is a schematic view of the device in its deployed configuration.

Figure 2 is a schematic view of the device in a folded configuration.

Fig. 3 is a schematic illustration of a composite shell.

Fig. 4 is a schematic view of the folding mechanism.

FIG. 5 is a schematic view showing the distribution of holes on the side plate.

Figure 6 is a schematic view of the distal support arm.

Fig. 7 is a schematic view of the folding process.

Fig. 8 is a schematic view of the deployment process.

In the figure: 1-a composite shell; 11-structural layer; 12-a tie layer; 2-folding and unfolding mechanism; 21-side plate; 211-mounting round hole B; 212-mounting round hole A; 213-straight slotted hole; 22-a head end support arm; 23-a first stop bar; 24-a second stop bar; 25-extension spring; 3-terminal support arm.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1-8, a composite material thin shell plane folding and unfolding device comprises a composite material thin shell 1, a folding and unfolding mechanism 2 and a tail end supporting arm 3, wherein the folding and unfolding mechanism is installed at one side edge of the composite material thin shell, and the tail end supporting arm is installed at the opposite side edge of the installation position of the composite material thin shell folding and unfolding mechanism;

the composite material thin shell comprises a structural layer 11 and a connecting layer 12, wherein the structural layer is formed by at least two sections of arc bistable composite material tape structures in parallel, the connecting layer is formed by bonding a flexible film or a fabric on the surface of one side or both sides of the structural layer, and the structural layers are connected into a whole; by adjusting the design of the connecting layer and the cross section of the composite material thin shell, the mechanical property of the composite material thin shell can be regulated and controlled according to requirements, and the composite material thin shell is suitable for various engineering applications;

the folding and unfolding mechanism comprises a side plate 21, a head end supporting arm 22, a first limiting rod 23 and a second limiting rod 24, the number of the side plate is two, the head end supporting arm, the first limiting rod and the second limiting rod are positioned between two side plates, the head end supporting arm, the first limiting rod and the second limiting rod are distributed in a triangular shape, the first limiting rod and the second limiting rod are telescopic rods, two ends of the first limiting rod are fixedly connected with the side plates, the second limiting rod is accommodated in a straight slot hole 213 of the side plates, the end part of the second limiting rod is connected with the side plates through a tension spring 25, when the folding mechanism is folded, the second limiting rod is tightly attached to a composite material thin shell under the action of the tension spring, the head end supporting arm is formed by sequentially connecting at least two sections of inner telescopic rods, and the inner telescopic rods are installed on a concave surface fixed at the head end of the composite material thin shell;

the tail end supporting arm is formed by sequentially connecting at least two sections of outer telescopic rods, and the outer telescopic rods are arranged on a convex surface fixed at the tail end of the composite material thin shell;

the device can realize simple, efficient and stable controllable folding and unfolding in a plane and has a self-locking function.

In this embodiment, the radian of the structural layer is α, and α is not less than one sixth of pi and not more than pi.

In this embodiment, the side plate is provided with a mounting round hole a212 for mounting the support arm, a mounting round hole B211 for mounting the first limiting rod, and a straight slot hole for mounting the second limiting rod, which are distributed in a triangular shape.

In this embodiment, the ratio of the thickness to the radius of curvature of the tape structure of bistable composite material in the structural layer is less than 1/20.

In this embodiment, the inner telescopic rod is connected with the composite material thin shell through the long upright column on the inner telescopic rod, and the length of the long upright column is such that when the planar folding and unfolding composite material thin shell mechanism is in a folding state, the axis of the first-end supporting arm coincides with the axis of the cylinder after the composite material thin shell is folded; the outer telescopic rods are connected with the composite material thin shell through the short stand columns on the outer telescopic rods; the long upright posts and the short upright posts are connected with the composite material thin shell in a gluing mode, and in some preferred embodiments, the long upright posts and the short upright posts can be fixed in a riveting or bolt connection mode.

In the embodiment, the fixing points of the long upright posts and the short upright posts and the composite material thin shell are uniformly distributed along the width direction.

In this embodiment, the length of the long upright column is LThe length of the short upright post is L, and L is less than L; wherein d is_{Inner part}The inner diameter of the composite material thin shell after being folded; d_HeadThe diameter of the inner telescopic rod in the head end supporting arm.

In this embodiment, the side plate has a minimum distance S between the edge of the mounting hole a and the center of the straight slot₁₃Is composed ofMinimum difference Δ h in height direction₁₃Is composed ofThe minimum distance S between the edge of the mounting round hole B and the center of the straight slotted hole₂₃Is composed ofMounting ofThe minimum difference between the edge of the round hole A and the edge of the mounting round hole B in the height direction is delta h₁₂Is, Δ h₁₂Not less than h; wherein d is_{Outer cover}The outer diameter of the composite material thin shell in a folded state; h is the height of the composite material thin shell in the unfolding state; delta is the thickness of the composite shell.

In this embodiment, the first limiting rod, the second limiting rod, the head end support arm and the tail end support arm are all extended and retracted by Δ l, where Δ l is α (α r-2rsin α); where r is the radius of the bistable composite tape construction.

In the present embodiment, the composite material used for the structural layer is a carbon fiber-epoxy resin composite material, and in some preferred embodiments, the matrix material may be any one of unsaturated polyester, vinyl ester resin, polyethylene, polypropylene, and polylactic acid resin; the reinforcing material can be any one of glass fiber, polyethylene, polypropylene, fibroin and hemp plant fiber, and has wide raw material source.

In this embodiment, the connecting layer is located on the convex surface of the composite shell, in some preferred embodiments, the connecting layer can be located on the concave surface of the composite shell, and in other preferred embodiments, the connecting layer can have two layers, which are located on the concave surface and the convex surface of the composite shell.

In this embodiment, the connection layer is made of a flexible film material, and may be made of flexible materials such as polyethylene or polyamide, in some preferred embodiments, the connection layer may be made of reflective materials such as aluminum plating or silver plating, so as to improve the effects of shielding sunlight and controlling temperature, and in other preferred embodiments, the connection layer may be made of a dark film processed by a carburizing process, so as to improve the heat absorption capability thereof.

A folding and unfolding method adopts a composite material thin shell plane folding and unfolding device:

winding: in an unfolded state, the head end supporting arm rotates towards the direction of the convex surface of the composite material thin shell, the composite material thin shell rotates along with the composite material thin shell and generates elastic bending deformation when contacting with the first limiting rod, then the composite material thin shell is gradually curled into a cylindrical shape under the action of bending moment and pushes the second limiting rod to slide towards the direction far away from the head end supporting arm, the elongation of the extension spring is increased, and the second limiting rod is tightly attached to the composite material thin shell; when the tail end supporting arm is contacted with the first limiting rod, the device is converted into a folded state and is kept stable, and meanwhile, the first limiting rod, the second limiting rod, the head end supporting arm and the tail end supporting arm extend to the longest state, wherein the extension amount is the increase amount of the folded width of the composite material thin shell;

unfolding: under fold condition, rotate the head end support arm to second gag lever post place direction, the combined material thin shell under fold condition rotates thereupon and takes place elastic deformation then reply gradually to the expansion state when terminal support arm contacts the second gag lever post, and first gag lever post, second gag lever post, head end support arm and terminal support arm all shorten to the shortest state simultaneously.

If this patent discloses or refers to parts or structures that are fixedly connected to each other, the fixedly connected may be understood as: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.