A rigid origami-based deployable polygonal bearing structure

Abstract

The application discloses a foldable polygon bearing structure based on rigid paper folding, which comprises a central plane and three or more modules; the central plane is any polygon with the number of edges being greater than or equal to 3; the number of the modules is the same as the number of edges of the central plane, each module comprises two completely same triangular planes and another triangular plane, sequentially being a first plane, a second plane and a third plane, and the first plane, the second plane and the third plane in each module are sequentially connected, wherein one edge of the first plane in each module is connected with one edge of the central plane, and one edge of the third plane in each module is connected with one edge of the first plane in the next module.

Description

Technical Field

[0001] This invention relates to the field of foldable polygonal structures, and in particular to a foldable polygonal structure with rigid folding, high folding-to-unfold ratio, and high load-bearing capacity. Background Technology

[0002] Foldable structures are function-based, shape-variable structures that can transform from a compact folded state to a controllable unfolded state. In most cases, the folded state is used for storage and transportation, while the unfolded state is used for operational needs. Due to their excellent folding properties, foldable structures are currently used in various engineering fields. For example, in civil engineering, foldable refuges, foldable bridges, and other foldable plate structures and foldable rod structures play an important role in emergency rescue and disaster relief due to their rapid construction and convenient transportation. In the medical field, foldable medical devices, such as vascular stents and origami-style surgical forceps, have enabled the miniaturization of devices and more complex operations.

[0003] There are many types of foldable structures, which can be classified into one-dimensional rod-shaped foldable structures, two-dimensional planar foldable structures, and three-dimensional volumetric foldable structures based on their geometric shape when deployed. One-dimensional rod-shaped foldable structures mainly involve folding in a single direction, such as space extension arms; two-dimensional planar foldable structures mainly involve the folding of planes and curved surfaces, such as solar arrays and satellite antennas; three-dimensional volumetric foldable structures mainly involve the folding of spheres, polyhedra, prisms, etc. Most of these foldable structures use non-rigid deformation to achieve folding, such as car airbags and flexible space capsules. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a foldable polygonal load-bearing structure based on rigid origami. This structure has both an unfolded and a folded state; the folded state exhibits good rigidity and load-bearing capacity; the unfolded state has a regular shape, facilitating storage and transportation. The structure is simple in composition, has a variable folding direction, adjustable geometric parameters, and can be mass-produced. Based on these advantages, this invention has significant implications and broad application prospects in packaging, home furnishings, civil engineering, construction, aerospace, and other fields.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A foldable polygonal support structure based on rigid origami includes a central face and three or more modules; the central face is a polygonal structure with more than 3 sides; the number of modules is the same as the number of sides of the central face, and each module includes two identical triangular faces and another triangular face, which are respectively called the first face, the second face, and the third face, and the first face, the second face, and the third face in each module are connected in sequence;

[0007] The first surface is adjacent to the second surface and connected to it by a first revolute joint; the second surface is adjacent to the third surface and connected to it by a second revolute joint; the center surface is adjacent to the first surface of each module and connected to it by a revolute joint; the third surface is connected to the first surface of the next module by a revolute joint.

[0008] During the unfolding and folding process, each module of the foldable polygonal load-bearing structure can rotate inward around the rotating joint and fold. In the final folded state, the first and second faces of each module completely overlap, and the first and second faces partially overlap with the third face. The modules are distributed in a rotationally symmetrical manner in space.

[0009] Furthermore, the foldable polygonal load-bearing structure has two unfolding and folding directions: inward and outward.

[0010] Furthermore, when the number of sides of the center face is even, the number of modules is the same as the number of sides, which is also even. By making the folding directions of two opposite modules the same, and the folding directions of two adjacent modules opposite, the inward folding and outward folding are alternated, resulting in an alternating inward and outward folding state.

[0011] Furthermore, the inwardly folded polygonal load-bearing structure achieves self-locking in its final folded state because the direction of the load-bearing force is perpendicular to its unfolding direction, thus giving it load-bearing capacity.

[0012] Furthermore, two polygonal load-bearing structures obtained by alternating inward and outward folds can be inserted relative to each other, so that their inward and outward folded edges align with each other.

[0013] Furthermore, by changing the number of sides of the central face, the angle of each vertex, and the side length between vertices, the folding characteristics of the unfoldable polygonal load-bearing structure can be altered.

[0014] Furthermore, the revolute joint is one of a hinge, a hinge assembly, or a bearing.

[0015] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0016] 1. The foldable polygonal load-bearing structure of the present invention has a thickness of only one sheet when unfolded, and a total height of three-dimensional solid when folded. It has a very large unfolding ratio, and the unfolded shape is regular, which is convenient for storage and transportation.

[0017] 2. The inwardly folding polygonal load-bearing structure obtained by the present invention achieves self-locking in the folded state because the direction of the load-bearing force is perpendicular to the direction of unfolding movement, thus having a high load-bearing capacity.

[0018] 3. The foldable polygonal load-bearing structure of the present invention can be transformed by crease conversion to obtain two foldable polygonal structures with opposite rotation directions. The two structures have completely different folding characteristics and load-bearing capacity, and can realize adjustment and adaptation to different working states.

[0019] 4. The foldable polygonal load-bearing structure of the present invention can be designed to change the number of sides, included angle and side length of the polygonal cross section to improve the folding and load-bearing characteristics of the structure. It can be applied to innovative designs in furniture, civil engineering, aerospace and other fields.

[0020] 5. The foldable polygonal load-bearing structure of the present invention can be interlocked between two structures. The interlocking ensures the stability of the structure, and at the same time doubles the number of load-bearing surfaces without changing the space occupied, which can greatly improve the load-bearing capacity of the structure.

[0021] 6. The folding process of the foldable polygonal bearing structure of the present invention is simple and can be decomposed into multiple steps corresponding to the number of sides of the polygon, and each step is a controllable single-degree-of-freedom folding.

[0022] 7. The present invention has a simple structure, which facilitates processing, manufacturing and mass production. Attached Figure Description

[0023] Figure 1-1 The diagram shows any quadrilateral in Example 1, which serves as the center plane of the foldable polygonal load-bearing structure.

[0024] Figures 1-2 to 1-5 This is a schematic diagram of the sequential design of the foldable structure with the center face of an arbitrary quadrilateral in Example 1; Figure 1-5 This is a schematic diagram of the design result of Example 1.

[0025] Figure 2-1 This is a schematic diagram of the flattened state of a structure that can be unfolded using the central face of any quadrilateral.

[0026] Figures 2-1 to 2-5 This is a schematic diagram of the sequential folding of the foldable structure with the center face of any quadrilateral in Example 2. Figure 2-5 This is a schematic diagram of the design result of the foldable structure with the center face of any quadrilateral in Example 2.

[0027] Figure 3-1 In order to make Figure 2-5 A schematic diagram of the structural equal-height design method. Figure 3-2 A schematic diagram showing the design result to ensure that the structures are of equal height.

[0028] Figure 4-1 This is a planar unfolded schematic diagram of the unfoldable structural module consisting of the central face of an equilateral triangle, as specified in this invention. Figure 4-2 and Figure 4-3These are schematic diagrams of the folded state (inward fold) of the module and its mirror image, schematic diagrams of the folded state (outward fold).

[0029] Figure 4-4 This is a schematic diagram of the inward folding intermediate state structure of the unfoldable equilateral triangle central plane structure in Embodiment 4. Figures 4-5 to 4-7 This is a schematic diagram of the sequential folding of the unfoldable equilateral triangle structure in Example 3. Figure 4-5 This represents the fully unfolded state of a developable structure with a central face of an equilateral triangle. Figure 4-7 This represents the fully folded state of a deployable structure with a central face of an equilateral triangle.

[0030] Figure 5-1 This is a planar unfolded schematic diagram of the module comprising the square central face developable structure specified in this invention. Figure 5-2 and Figure 5-3 These are schematic diagrams of the folded state (inward fold) of the module and its mirror image, schematic diagrams of the folded state (outward fold).

[0031] Figure 5-4 This is a schematic diagram of the inward folded state of the square center plane unfoldable structure in Embodiment 5. Figures 5-5 to 5-9 This is a schematic diagram of the sequential folding of the square center plane unfoldable structure in Example 5. Figure 5-5 This represents the fully unfolded state of the structure. Figures 5-6 to 5-9 This represents the intermediate state of the structure's folding.

[0032] Figure 6-1 This is a planar unfolded schematic diagram of the modules that constitute the developable structure of the central face of a regular pentagon, as specified in this invention. Figure 6-2 and Figure 6-3 These are schematic diagrams of the folded state (inward fold) of the module and its mirror image, schematic diagrams of the folded state (outward fold).

[0033] Figure 6-4 This is a schematic diagram of the inward folding state of the unfoldable structure with the central face of the regular pentagon in Example 6. Figures 6-5 to 6-8 This is a schematic diagram of the sequential folding of the unfoldable structure with the central face of the regular pentagon in Example 6. Figures 6-6 to 6-7 This represents the intermediate state of the structure's folding. Figure 6-8 This represents the fully folded state of the structure.

[0034] Figure 7-1 This is a schematic diagram of the structure in Example 7, which has the same crease construction as Example 5 but a different folding pattern with alternating inward and outward folds. Figures 7-2 to 7-5 This is a schematic diagram of the sequential folding of the structure. Figures 7-2 to 7-4 This is the middle folded state. Figure 7-5 This refers to the fully folded state of any quadrilateral structure, where it is alternately folded inwards and outwards.

[0035] Figure 8-3This is a schematic diagram illustrating the relative insertion of two identical structures in Example 7, as described in Example 8. Figures 8-1 to 8-2 This is a schematic diagram of the process of two identical structures being inserted into each other. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0037] Example 1:

[0038] In this embodiment, an arbitrary quadrilateral is used as an example to illustrate the design method of the folding structure.

[0039] like Figure 1-1 Draw an arbitrary quadrilateral, where the vertices of the quadrilateral are named feature points (a1-a4), and the sides of the quadrilateral are named feature edges (A1-A4).

[0040] like Figure 1-2 The design follows a counter-clockwise folding sequence. Each feature point involves three feature lines: an extension, an angle bisector, and a perpendicular (the extension is an auxiliary line for constructing the angle bisector, represented by a dashed line). Starting from point a1, extend side A1 to obtain extension A1', and construct the angle bisector C1 between A1' and side A2, as well as the perpendicular B1 to side A1. The other three feature points are constructed similarly, with the three feature lines corresponding to feature points a2, a3, and a4 constructed in the same way. Specifically, for the extension A2' of side A2, construct the angle bisector C2 between A2' and side A3, as well as the perpendicular B2 to side A2; for the extension A3' of side A3, construct the angle bisector C3 between A3' and side A4, as well as the perpendicular B3 to side A3; for the extension A4' of side A4, construct the angle bisector C4 between A4' and side A1, as well as the perpendicular B4 to side A4.

[0041] like Figure 1-3 The angle bisector passing through each point intersects the perpendicular line passing through the next feature point at points b1, b2, b3, b4. Sides A1, B1, and C4 form right triangle R1, sides A2, B2, and C1 form right triangle R2, sides A3, B3, and C2 form right triangle R3, and sides A4, B4, and C3 form right triangle R4.

[0042] like Figure 1-4 ,Will Figure 1-3 The four right triangles obtained are mirrored about the angle bisectors of the feature points above the feature points connected to their hypotenuses (R1 is mirrored about C4, R2 about C1, R3 about C2, and R4 about C3). This results in a congruent right triangle that is symmetric about its hypotenuse (diagonal) (R1 is congruent to R1', R2 to R2', R3 to R3', and R4 to R4').

[0043] like Figure 1-5 , respectively Figure 1-4 The obtained right-angled triangles vertices a1', a2', a3', a4' are connected to the intersection points b4, b1, b2, b3 of the perpendicular line corresponding to the feature point above the feature point containing the right-angled side of the template right-angled triangle (R1, R2, R3, R4) and the angle bisector. This results in four right-angled triangles (T1, T2, T3, T4), thus completing the construction of the folded structure. This folded structure can be considered to consist of a base G1 and four modules P1, P2, P3, P4, where P1 is composed of three right-angled triangles R1, R1', T1; P2 is composed of three right-angled triangles R2, R2', T2; P3 is composed of three right-angled triangles R3, R3', T3; and P4 is composed of three right-angled triangles R4, R4', T4.

[0044] Example 2:

[0045] Furthermore, taking the aforementioned arbitrary quadrilateral as an example, the design method of the folding structure is explained, and a structure such as... Figure 2-1 The diagram shows the fully unfolded state of the folded structure. This embodiment provides an inwardly foldable polygonal structure, including a base G1 and four modules P1, P2, P3, and P4. The base G1 is an arbitrary quadrilateral, and the structural parameters of the four modules P1, P2, P3, and P4 are as described in Embodiment 1.

[0046] The bottom surface G1 is adjacent to the first surface of module P1 and connected to it through the revolute joint A1 of module P1. In counterclockwise order, the bottom surface G1 is adjacent to the first surface of module P2 and connected to it through the revolute joint A2 of module P2. The bottom surface G1 is adjacent to the first surface of module P3 and connected to it through the revolute joint A3 of module P3. The bottom surface G1 is adjacent to the first surface of module P4 and connected to it through the revolute joint A4 of module P4. Module P1 and module P2 are connected to each other through the revolute joint EE1. Module P2 and module P3 are connected to each other through the revolute joint EE2. Module P3 and module P4 are connected to each other through the revolute joint EE3. Module P4 and module P1 are connected to each other through the revolute joint EE4, thus forming a foldable arbitrary quadrilateral structure.

[0047] Figures 2-1 to 2-5 This refers to the sequential folding process of any quadrilateral folding inwards. Figure 2-1 This represents the unfolded state of a structure whose central face can be unfolded from any quadrilateral. Figure 2-2 Complete the folded state for module P1. Figure 2-3 Complete the folded state for P1 and P2. Figure 2-4 Complete the folded state for modules P1, P2, and P3. Figure 2-5 This is the fully folded state. Each folding step is a single-degree-of-freedom fold, while the overall structure has four independent degrees of freedom.

[0048] Example 3:

[0049] Furthermore, the design method of the equal-height folding structure is illustrated in the embodiments using an arbitrary quadrilateral as an example.

[0050] like Figure 3-1 As shown, by cutting off the top portion of the uneven structure at the required height using a plane parallel to the bottom surface G1, the remaining structure is as follows: Figure 3-2 As shown, this is the construction of an arbitrary quadrilateral folded structure with equal height.

[0051] Example 4:

[0052] Furthermore, the construction method of Example 1 is applied to the central plane of an equilateral triangle to design a structure such as... Figure 4-1 The diagram shows the unfolded pattern of the folded structure. This pattern consists of three congruent triangles with right-angled sides of lengths a and b. These three triangles correspond to the first, second, and third faces, K1, K2, and K3, respectively. Face K1 is adjacent to face K2 and connected to it via a first revolute joint L1. Face K2 is adjacent to face K3 and connected to it via a second revolute joint L2. Folding outwards around the center line of the revolute joint (as shown in the diagram), the folded shape of the module is as follows: Figure 4-2 As shown, this forms an inwardly foldable module. Mirroring this module creates a mirrored module with an outwardly foldable structure, the shape of which is as follows. Figure 4-3 As shown, the surfaces and revolute joints of the mirror module do not change, and all solid-line revolute joints are folded in opposite directions.

[0053] like Figure 4-4 As shown, this embodiment provides an inwardly folded equilateral triangle center plane unfolding structure, including a base X1 and three modules I1, I2, and I3. The base X1 is an equilateral triangle, and the three modules I1, I2, and I3 have the same structural parameters.

[0054] The bottom surface X1 is adjacent to the first surface of module I1 and connected to it through the revolute joint N1 of module I1. In counterclockwise order, the bottom surface X1 is adjacent to the first surface of module I2 and connected to it through the revolute joint N2 of module I2. The bottom surface X1 is adjacent to the first surface of module I3 and connected to it through the revolute joint N3 of module I3. Module I1 and module I2 are connected through the revolute joint KK2. Module I2 and module I3 are connected through the revolute joint KK3. Module I3 and module I1 are connected through the revolute joint KK1, thus forming a folded structure of the central surface of an equilateral triangle.

[0055] Based on the arrangement and connection method of the base surface and modules of the above-mentioned equilateral triangle central plane folded structure, Figures 4-5 to 4-7 This refers to the sequential folding process of the structure. Figure 4-5 This represents the unfolded state of the folded structure of the central plane of an equilateral triangle. Figure 4-6 This is the middle folded state. Figure 4-7 It is in a fully folded state.

[0056] Example 5:

[0057] Furthermore, applying the above construction method to the central plane of a regular quadrilateral, a structure like... Figure 5-1 The diagram shows the unfolded pattern of the folded structure module. This pattern consists of three congruent triangles with right-angled sides of lengths c and d. These three triangles correspond to the first, second, and third faces, V1, V2, and V3, respectively. Face V1 is adjacent to face V2 and connected to it via a first revolute joint O1. Face V2 is adjacent to face V3 and connected to it via a second revolute joint O2. The module folds outwards around the center line of the revolute joint, forming its folded shape. Figure 5-2 As shown, this forms an inwardly foldable module. Mirroring this module creates a mirrored module with an outwardly foldable structure, the shape of which is as follows. Figure 5-3 As shown, the surfaces and revolute joints of the mirror module do not change, and all solid-line revolute joints are folded in opposite directions.

[0058] like Figure 5-4 As shown, this embodiment provides an inwardly folded square center plane unfolding structure, including a bottom surface Y1 and four modules J1, J2, J3, and J4. The bottom surface Y1 is a regular quadrilateral, and the four modules J1, J2, J3, and J4 have the same structural parameters.

[0059] The bottom surface Y1 is adjacent to the first surface of module J1 and connected to it through the revolute joint M1 of module J1. In counterclockwise order, the bottom surface Y1 is adjacent to the first surface of module J2 and connected to it through the revolute joint M2 of module J2. The bottom surface Y1 is adjacent to the first surface of module J3 and connected to it through the revolute joint M3 of module J3. The bottom surface Y1 is adjacent to the first surface of module J4 and connected to it through the revolute joint M4 of module J4. Module J1 and module J2 are connected through the revolute joint LL2. Module J2 and module J3 are connected through the revolute joint LL3. Module J3 and module J4 are connected through the revolute joint LL4. Module J4 and module J1 are connected through the revolute joint LL1, thus forming a square center surface folded structure.

[0060] Based on the arrangement and connection method of the bottom surface and modules of the above-mentioned square center plane folded structure, Figures 5-5 to 5-9 This describes the sequential folding process of a square central face folding structure. Figure 5-5 This represents the unfolded state of the structure. Figure 5-6 Complete the folded state for module J1. Figure 5-7 Complete the folded state for modules J1 and J2. Figure 5-8 Complete the folded state for modules J1, J2, and J3. Figure 5-9 It is in a fully folded state.

[0061] Example 6:

[0062] Furthermore, applying the above construction method to the central plane of a regular pentagon, a structure like... Figure 6-1 The diagram shows the unfolded pattern of the folded structure. This pattern consists of three congruent triangles with right-angled sides of lengths e and f. These three triangles correspond to the first, second, and third faces, respectively, CC1, CC2, and CC3. Face CC1 is adjacent to face CC2 and connected to it via a first revolute joint BB1. Face CC2 is adjacent to face CC3 and connected to it via a second revolute joint BB2. The module folds outwards around the center line of the revolute joint, forming its folded shape. Figure 6-2 As shown, this forms an inwardly foldable module. Mirroring this module creates a mirrored module with an outwardly foldable structure, the shape of which is as follows. Figure 6-3 As shown, the surfaces and revolute joints of the mirror module do not change, and all solid-line revolute joints are folded in opposite directions.

[0063] like Figure 6-4 As shown, this embodiment provides an inwardly foldable regular pentagonal central face unfolding structure, including a bottom surface Z1 and five modules AA1, AA2, AA3, AA4, and AA5. The bottom surface Z1 is a regular pentagon, and the five modules AA1, AA2, AA3, AA4, and AA5 have the same structural parameters.

[0064] The bottom surface Z1 is adjacent to the first surface of module AA1 and connected to it through the revolute joint W1 of module AA1. In counterclockwise order, the bottom surface Z1 is adjacent to the first surface of module AA2 and connected to it through the revolute joint W2 of module AA2. The bottom surface Z1 is adjacent to the first surface of module AA3 and connected to it through the revolute joint W3 of module AA3. The bottom surface Z1 is adjacent to the first surface of module AA4 and connected to it through the revolute joint W4 of module AA4. The bottom surface Z1 is adjacent to the first surface of module AA5 and connected to it through the revolute joint W5 of module AA5. Module AA1 and module AA2 are connected to each other through revolute joint MM1. Module AA2 and module AA3 are connected to each other through revolute joint MM2. Module AA3 and module AA4 are connected to each other through revolute joint MM3. Module AA4 and module AA5 are connected to each other through revolute joint MM4. Module AA5 and module AA1 are connected to each other through revolute joint MM5, thus forming a folded structure of the central surface of a regular pentagon.

[0065] Based on the arrangement and connection method of the bottom surface and modules of the above-mentioned folded structure with the central face of the regular pentagon, Figures 6-5 to 6-8This describes the sequential folding process of the central face of a regular pentagon. Figure 6-5 This represents the fully unfolded state of the folded structure of the central face of a regular pentagon. Figure 6-6 Complete the folded state for module AA1. Figure 6-7 Complete the folded state for modules AA1 and AA2. Figure 6-8 It is in a fully folded state.

[0066] Example 7:

[0067] Furthermore, using the same construction method for regular quadrilaterals designed in Example 5, a structure with the same crease construction but different folding forms can be explored, such as... Figure 7-1 As shown. This embodiment provides a square center plane folding structure with alternating inward and outward folds, including a bottom surface HH1 and four modules JJ1, JJ2, JJ3, and JJ4. The bottom surface HH1 is square, and the structural parameters of the four modules JJ1, JJ2, JJ3, and JJ4 are as described in Embodiment 5.

[0068] The bottom surface HH1 is adjacent to the first surface of module JJ1 and connected to it through the revolute joint II1 of module JJ1. In counterclockwise order, the bottom surface HH1 is adjacent to the first surface of module JJ2 and connected to it through the revolute joint II2 of module JJ2. The bottom surface HH1 is adjacent to the first surface of module JJ3 and connected to it through the revolute joint II3 of module JJ3. The bottom surface HH1 is adjacent to the first surface of module JJ4 and connected to it through the revolute joint II4 of module JJ4. Modules JJ1 and JJ2 are connected to each other through revolute joint NN1. Modules JJ2 and JJ3 are connected to each other through revolute joint NN2. Modules JJ3 and JJ4 are connected to each other through revolute joint NN3. Modules JJ4 and JJ1 are connected to each other through revolute joint NN4, thus forming a square center surface folding structure with alternating inward and outward folds.

[0069] Based on the arrangement and connection method of the bottom surface and modules of the square center face folding structure with alternating inward and outward folds described above, Figures 7-2 to 7-5 This describes the sequential folding process of a square central face folding structure. Figure 7-2 Complete the folded state for module JJ1. Figure 7-3 Complete the folded state for modules JJ1 and JJ2. Figure 7-4 Complete the folded state for modules JJ1, JJ2, and JJ3. Figure 7-5 It is in a fully folded state.

[0070] Example 8:

[0071] Furthermore, by combining the structures from the two embodiments in 7, we can explore ways to... Figures 8-1 to 8-3 The diagram shows a combined structure with relative insertion of the two models. This structure consists of two examples from Implementation Seven. Figure 7-5The model structures shown in their fully folded state are named Structure I and Structure II, respectively. The corner formed by module JJ1 in Structure I (both sides folded inward) is inserted opposite to the corner formed by module JJ2 in Structure II (both sides folded outward), as follows: Figure 7-1 As shown, the remaining three corners can be matched and combined to form a whole with higher load-bearing capacity, as... Figure 8-3 As shown.

[0072] This invention is not limited to the embodiments described above. The above description of specific embodiments is intended to illustrate and explain the technical solutions of this invention. The specific embodiments described above are merely illustrative and not restrictive. Without departing from the spirit and scope of the claims, those skilled in the art can make many specific modifications based on the teachings of this invention, and these modifications all fall within the scope of protection of this invention.

Claims

1. A rigid origami-based deployable polygonal load bearing structure, characterized in that, The polygonal bearing structure comprises a center face and three or more modules; the center face is a polygonal structure with more than three sides; the number of the modules is the same as the number of the sides of the center face, each module comprises two identical triangular faces and another triangular face, in sequence, a first face, a second face and a third face, and the first face, the second face and the third face in each module are sequentially connected; the first face, the second face and the third face are all right-angled triangles; The first face and the second face are adjacent to each other and connected by a first rotary pair, the second face and the third face are adjacent to each other and connected by a second rotary pair; the center face and the first face of each module are adjacent to each other and connected by a rotary pair; the third face and the first face of the next module are connected by a rotary pair; In the unfolding and folding process of the foldable polygonal bearing structure, each module can rotate inwardly around the rotary pair to be folded, and in the final folded state, the first face and the second face of each module completely coincide, and the first face and the second face after the coincidence and the third face partially coincide, and each module is rotationally symmetrically distributed in space; In the final folded state of the inwardly folded polygonal bearing structure, the direction of the bearing force is perpendicular to the unfolding direction, so that the structure is self-locked, thereby having a bearing performance; For the case that the number of sides of the center face is even, the number of modules is also even, which is the same as the number of sides, by allowing the folding directions of the opposite two modules to be the same and the folding directions of the adjacent two modules to be opposite, the inward folding and the outward folding are alternately performed, thereby obtaining the folding state of the inward folding and the outward folding being alternately performed.

2. A rigid origami-based deployable polygonal load bearing structure according to claim 1, characterized in that, The foldable polygonal bearing structure has two unfolding and folding directions, namely, inward and outward.

3. A rigid origami-based deployable polygonal load bearing structure according to claim 1, wherein, Two polygonal bearing structures obtained by the inward folding and the outward folding being alternately performed can be relatively inserted, so that the inward folding edges and the outward folding edges of the two structures are mutually connected.

4. A rigid origami-based deployable polygonal load bearing structure according to claim 1, wherein, By changing the number of sides of the center face, the angles of the vertices and the lengths of the edges between the vertices, the folding characteristics of the foldable polygonal bearing structure can be changed.

5. A rigid origami-based deployable polygonal load bearing structure according to claim 1, wherein, The rotary pair is one of a hinge, a hinge leaf or a bearing.

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