A single degree of freedom auxetic structure unit with multiple deformation modes

Abstract

The present application relates to a kind of single degree of freedom tensile inflation structure unit with multiple deformation modes, unit overall is cubic structure, including eight rectangular blocks and thirty-six right triangular prisms with base is isosceles right triangle;Eight rectangular blocks are respectively placed at the eight vertices of square, four rectangular blocks on each side of unit form a group of rectangular block module, every six right triangular prisms are connected to form a group of closed loop structure hexagonal connection module, thirty-six right triangular prisms are collectively formed six groups of hexagonal connection module, and the four rectangular blocks of each rectangular block module are connected by a group of hexagonal connection module.The single degree of freedom tensile inflation structure unit with multiple deformation modes of the present application has multiple deformation modes, single degree of freedom, can be infinitely expanded, can be large, can be simultaneously shrunk to completely folded state in three directions, good stability, has wide application prospect in the field such as aerospace, civil construction.

Description

Technical Field

[0001] This invention relates to the field of deployable structures, and in particular to a single-degree-of-freedom tensile structural unit with multiple deformation modes. Background Technology

[0002] Deployable structures, due to their excellent folding and unfolding properties, can meet the application requirements of different occasions by switching between a folded and unfolded state, and are currently widely used in aerospace, civil engineering, medical equipment, and transforming robots. Expansionable structures differ from common natural structures; they contract under compression and expand under tension, a characteristic that gives them exceptional mechanical properties.

[0003] With researchers' continuous exploration of developable and tensile structures, a relatively mature system has been formed. However, existing developable structures with tensile properties generally have characteristics such as a single deformation mode, many degrees of freedom, and difficulty in extending two-dimensional structures to three-dimensional structures. These characteristics greatly limit the application prospects of tensile structures. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a single-degree-of-freedom tensile structural unit with a large expandability, good stability, and multiple deformation modes.

[0005] The present invention is implemented using the following scheme: a single-degree-of-freedom elastomeric structural unit with multiple deformation modes. The unit as a whole has a cubic structure, including eight rectangular blocks and thirty-six right-angled triangular prisms with isosceles right-angled triangles as the base. The eight rectangular blocks are respectively placed at the eight vertices of the cube. The four rectangular blocks on each side of the unit form a group of rectangular block modules. Every six right-angled triangular prisms are connected to form a group of closed-loop hexagonal connection modules. The thirty-six right-angled triangular prisms form six groups of hexagonal connection modules. The four rectangular blocks of each group of rectangular block modules are connected through a group of hexagonal connection modules.

[0006] Furthermore, among the thirty-six right-angled triangular prisms, twelve right-angled triangular prisms have all three sides connecting their two bases as connecting edges, and are called first-type right-angled triangular prisms, where the right-angled side is the first connecting edge, and the other two sides are the second and third connecting edges, respectively; among the remaining twenty-four right-angled triangular prisms, all three sides connecting their two bases except the right-angled side can be used as connecting edges, which are the first and second connecting edges, respectively, and are called second-type right-angled triangular prisms; each group of hexagonal connecting modules consists of two first-type right-angled triangular prisms and four second-type right-angled triangular prisms, with the upper bases of the two first-type right-angled triangular prisms and the four second-type right-angled triangular prisms located in the same plane, and their lower bases also located in the same plane.

[0007] Furthermore, in each group of hexagonal connection modules, the corresponding connecting edges of two adjacent right-angled triangular prisms are connected by a revolute joint; the corresponding connecting edges of each group of hexagonal connection modules and the corresponding group of rectangular block modules are also connected by a revolute joint.

[0008] Furthermore, each group of hexagonal connecting modules exhibits four folding trends, resulting in four states when fully folded. The first folding trend, when fully folded, involves the upper left side of the first type of right-angled triangular prism coinciding with the upper side of the second type of right-angled triangular prism, the lower right side of the first type of right-angled triangular prism coinciding with the lower side of the second type of right-angled triangular prism, and the left side of the second type of right-angled triangular prism coinciding with the right side of the second type of right-angled triangular prism. The second folding trend, when fully folded, involves the upper left side of the first type of right-angled triangular prism coinciding with the left side of the second type of right-angled triangular prism, the lower right side of the first type of right-angled triangular prism coinciding with the right side of the second type of right-angled triangular prism, and the upper side of the second type of right-angled triangular prism coinciding with the lower side of the second type of right-angled triangular prism. The second type of folding trend, when fully folded, has the side of the hypotenuse of the first type of right-angled triangular prism on the upper left coinciding with the side of the hypotenuse of the upper second type of right-angled triangular prism, the side of the hypotenuse of the first type of right-angled triangular prism on the lower right coinciding with the side of the hypotenuse of the right second type of right-angled triangular prism, and the side of the hypotenuse of the second type of right-angled triangular prism on the left coinciding with the side of the hypotenuse of the lower second type of right-angled triangular prism; the fourth type of folding trend, when fully folded, has the side of the hypotenuse of the first type of right-angled triangular prism on the upper left coinciding with the side of the hypotenuse of the left second type of right-angled triangular prism, the side of the hypotenuse of the first type of right-angled triangular prism on the lower right coinciding with the side of the hypotenuse of the lower second type of right-angled triangular prism, and the side of the hypotenuse of the second type of right-angled triangular prism on the upper right coinciding with the side of the hypotenuse of the right second type of right-angled triangular prism.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The single-degree-of-freedom elastomeric structural unit of the present invention has multiple deformation modes, single degree of freedom, can be infinitely expanded, has a large unfolding ratio, can be contracted to a completely folded state in three directions at the same time, has good stability, and has broad application prospects in aerospace, civil engineering and other fields.

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a single-degree-of-freedom tautological structural unit with multiple deformation modes; Figure 2 This is a schematic diagram of a first-class right-angled triangular prism; Figure 3 This is a schematic diagram of a second type of right-angled triangular prism; Figure 4 This is a schematic diagram of a hexagonal connection module; Figure 5 This is a schematic diagram of the first plane on the front side; Figure 6 This is a schematic diagram of the second plane on the left. Figure 7 This is a schematic diagram of the third plane at the rear. Figure 8 This is a schematic diagram of the fourth plane on the right. Figure 9 This is a schematic diagram of the fifth plane on the upper side; Figure 10 This is a schematic diagram of the sixth plane on the lower side; Figure 11 This is a schematic diagram of the fully folded state under the first folding trend; Figure 12 This is a schematic diagram of the fully folded state under the second folding trend; Figure 13 This is a schematic diagram of the fully folded state under the third folding trend; Figure 14 This is a schematic diagram of the fully folded state under the fourth folding trend; Figure 15 These are all schematic diagrams showing the first type of folding trend when fully folded; Figure 16 These are all schematic diagrams of the second type of folding trend when fully folded.

[0012] Explanation of the numbering in the diagram: M1 - First rectangular block from the top left of the front side; M2 - Second rectangular block from the top right of the front side; M3 - Third rectangular block from the bottom left of the front side; M4 - Fourth rectangular block from the bottom right of the front side; M5 - Fifth rectangular block from the top left of the back side; M6 - Sixth rectangular block from the bottom left of the back side; M7 - Seventh rectangular block from the top right of the back side; M8 - Eighth rectangular block from the bottom right of the back side; D1 - First right-angled triangular prism; D2 - Second right-angled triangular prism; D3 - Third right-angled triangular prism; D4 - Fourth right-angled triangular prism; D5 - Fifth right-angled triangular prism; D6 - Sixth right-angled triangular prism; D7 - Seventh right-angled triangular prism; D8 - Eighth right-angled triangular prism; D9 - Ninth right-angled triangular prism; D10 - Tenth right-angled triangular prism; D11 - Eleventh right-angled triangular prism; D12 - Twelfth right-angled triangular prism. D13 - Thirteenth Right-Angled Triangular Prism, D14 - Fourteenth Right-Angled Triangular Prism, D15 - Fifteenth Right-Angled Triangular Prism, D16 - Sixteenth Right-Angled Triangular Prism, D17 - Seventeenth Right-Angled Triangular Prism, D18 - Eighteenth Right-Angled Triangular Prism, D19 - Nineteenth Right-Angled Triangular Prism, D20 - Twentieth Right-Angled Triangular Prism, D21 - Twenty-first Right-Angled Triangular Prism, D22 - Twenty-second Right-Angled Triangular Prism, D23 - Twenty-third Right-Angled Triangular Prism, D24 - Twenty-fourth Right-Angled Triangular Prism, D25 - Twenty-fifth Right-Angled Triangular Prism, D26 - Twenty-sixth Right-Angled Triangular Prism, D27 - Twenty-seventh Right-Angled Triangular Prism, D28 - Twenty-eighth Right-Angled Triangular Prism, D29 - Twenty-ninth Right-Angled Triangular Prism, D30 - Thirtieth Right-Angled Triangular Prism, D31 - The following are listed: D32-32 Right-angled Triangular Prism, D33-33 Right-angled Triangular Prism, D34-34 Right-angled Triangular Prism, D35-35 Right-angled Triangular Prism, D36-36 Right-angled Triangular Prism, R1-1st Revolute Joint, R2-2nd Revolute Joint, R3-3rd Revolute Joint, R4-4th Revolute Joint, R5-5th Revolute Joint, R6-6th Revolute Joint, R7-7th Revolute Joint, R8-8th Revolute Joint, R9-9th Revolute Joint, R10-10th Revolute Joint, R11-11th Revolute Joint, R12-12th Revolute Joint, R13-13th Revolute Joint, R14-14th Revolute Joint, R15-15th Revolute Joint, R16-16th Revolute Joint, R17-17th Revolute Joint. R18 - 18th revolute joint, R19 - 19th revolute joint, R20 - 20th revolute joint, R21 - 21st revolute joint, R22 - 22nd revolute joint, R23 - 23rd revolute joint, R24 - 24th revolute joint, R25 - 25th revolute joint, R26 - 26th revolute joint, R27 - 27th revolute joint, R28 - 28th revolute joint, R29 - 29th revolute joint, R30 - 30th revolute joint, R31 - 31st revolute joint, R32 - 32nd revolute joint, R33 - 33rd revolute joint, R34 - 34th revolute joint, R35 - 35th revolute joint, R36 - 36th revolute joint, R37 - 37th revolute joint, R38 - 38th revolute joint.R39 - 39th revolute joint, R40 - 40th revolute joint, R41 - 41st revolute joint, R42 - 42nd revolute joint, R43 - 43rd revolute joint, R44 - 44th revolute joint, R45 - 45th revolute joint, R46 - 46th revolute joint, R47 - 47th revolute joint, R48 - 48th revolute joint. Detailed Implementation

[0013] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0014] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0015] like Figures 1-16 As shown, a single-degree-of-freedom elastomeric structural unit with multiple deformation modes is presented. The unit has a cube-like structure, comprising eight rectangular blocks and thirty-six right-angled triangular prisms with isosceles right-angled triangles as their bases. The eight rectangular blocks are arranged in the same way: the bottom front base is the length, the bottom left side is the width, and the left front side is the height. The front and back sides of the rectangular blocks are rectangles formed by the length and height, the left and right sides are rectangles formed by the width and height, and the top and bottom faces are rectangles formed by the length and width. The eight rectangular blocks are placed at the eight vertices of the cube. Four rectangular blocks on each side of the unit form a group of rectangular block modules. Every six right-angled triangular prisms are connected to form a closed-loop hexagonal connection module. The thirty-six right-angled triangular prisms form six groups of hexagonal connection modules. The four rectangular blocks in each group are connected by a group of hexagonal connection modules.

[0016] In this invention, the "single degree of freedom" in the single-degree-of-freedom elastomeric structural unit with multiple deformation modes means that, given an input model, the model may simultaneously shrink to a fully folded state in three directions, or the model may simultaneously expand to its maximum unfolded state in three directions. Movement in one direction will drive synchronous movement in the other three directions, either increasing or decreasing simultaneously.

[0017] The eight rectangular blocks are M1, M2, M3, M4, M5, M6, M7, and M8. M1, M2, M3, and M4 form the first group of rectangular blocks, with their centers located on the front side of the cube-like structure, forming the first plane. M1, M3, M5, and M6 form the second group of rectangular blocks, with their centers located on the left side of the cube-like structure, forming the second plane. M5, M6, M7, and M8 form the third group of rectangular blocks, with their centers located on the rear side of the cube-like structure, forming the third plane. M2, M4, M7, and M8 form the fourth group of rectangular blocks, with their centers located on the right side of the cube-like structure, forming the fourth plane. M1, M2, M5, and M7 form the fifth group of rectangular blocks, with their centers located on the top side of the cube-like structure, forming the fifth plane. M3, M4, M6, and M8 form the sixth group of rectangular blocks, with their centers located on the bottom side of the cube-like structure, forming the sixth plane.

[0018] In this embodiment, all twelve sides of each rectangle can be used as connecting edges. Among the thirty-six right-angled triangular prisms, twelve right-angled triangular prisms have three sides connecting their two bases that can also be used as connecting edges; these are called the first type of right-angled triangular prisms. The right-angled sides are the first connecting edges, and the remaining two sides are the second and third connecting edges, respectively. Figure 2 As shown; of the remaining twenty-four right-angled triangular prisms, all but the right-angled sides of the three sides connecting the two bases can serve as connecting sides, namely the first connecting side and the second connecting side, which are called the second type of right-angled triangular prisms, such as... Figure 3 As shown.

[0019] like Figure 4 As shown, each group of hexagonal connection modules consists of two first-type right-angled triangular prisms and four second-type right-angled triangular prisms. The upper bases of the two first-type right-angled triangular prisms and the four second-type right-angled triangular prisms are all located on the same plane, and their lower bases are also located on the same plane.

[0020] The two first-class right-angled triangular prisms are the upper left first-class right-angled triangular prism and the lower right first-class right-angled triangular prism, respectively. The four second-class right-angled triangular prisms are the upper second-class right-angled triangular prism, the lower second-class right-angled triangular prism, the left second-class right-angled triangular prism, and the right second-class right-angled triangular prism. In each group of hexagonal connection modules, the second connecting edge of the upper left first type right-angled triangular prism is connected to the first connecting edge of the upper second type right-angled triangular prism via a revolute joint, with the first connecting edge of the upper left first type right-angled triangular prism facing upwards and the sides containing the two right angles of the upper second type right-angled triangular prism facing upwards. The third connecting edge is connected to the first connecting edge of the left second type right-angled triangular prism via a revolute joint, with the sides containing the two right angles of the left second type right-angled triangular prism facing left. Similarly, the second connecting edge of the lower right first type right-angled triangular prism is connected to the first connecting edge of the lower second type right-angled triangular prism via a revolute joint, with the first connecting edge of the lower right first type right-angled triangular prism facing downwards and the sides containing the two right angles of the lower second type right-angled triangular prism facing downwards. The third connecting edge is connected to the first connecting edge of the right second type right-angled triangular prism via a revolute joint, with the right second type right-angled triangular prism facing downwards. The two right angles are located on the right side; the second connecting edge of the upper second type right-angled triangular prism is connected to the second connecting edge of the right second type right-angled triangular prism through a revolute joint, and the second connecting edge of the lower second type right-angled triangular prism is connected to the second connecting edge of the left second type right-angled triangular prism through a revolute joint; the hexagonal connection module has four connection positions with each rectangle, where the first connecting edge of the upper left first type right-angled triangular prism is the first connection position, the second connecting edge of the upper second type right-angled triangular prism is connected to the second connecting edge of the right second type right-angled triangular prism through a revolute joint on the side where the revolute joint is located is the second connection position, the first connecting edge of the lower right first type right-angled triangular prism is the third connection position, and the second connecting edge of the lower second type right-angled triangular prism is connected to the second connecting edge of the left second type right-angled triangular prism through a revolute joint on the side where the revolute joint is located is the fourth connection position.

[0021] In this embodiment, the corresponding connecting edges of two adjacent right-angled triangular prisms in each group of hexagonal connecting modules are connected by a revolute joint; the corresponding connecting edges of each group of hexagonal connecting modules and the corresponding group of rectangular block modules are also connected by a revolute joint.

[0022] like Figure 5 As shown, in the first plane on the front side, the first group of hexagonal connecting modules is connected to the first group of rectangular connecting modules. The first connection position of the hexagonal connecting module is connected to the lower right side of the M1 rectangular block through a revolute joint R1. The second connection position is connected to the lower left side of the M2 rectangular block through a revolute joint R5. The third connection position is connected to the upper left side of the M4 rectangular block through a revolute joint R6. The fourth connection position is connected to the upper right side of the M3 rectangular block through a revolute joint R8.

[0023] like Figure 6As shown, in the second plane on the left, the second group of hexagonal-like connecting modules are connected to the second group of rectangular connecting modules. The first connection position of the hexagonal-like connecting module is connected to the lower front edge of the M5 rectangular block via a revolute joint R9. The second connection position is connected to the lower rear edge of the M1 rectangular block via a revolute joint R12. The third connection position is connected to the upper rear edge of the M3 rectangular block via a revolute joint R14. The fourth connection position is connected to the upper front edge of the M6 ​​rectangular block via a revolute joint R16.

[0024] like Figure 7 As shown, in the third plane on the rear side, the third group of hexagonal-like connecting modules is connected to the third group of rectangular connecting modules. The first connection position of the hexagonal-like connecting module is connected to the lower left side of the M7 rectangular block through a revolute joint R17. The second connection position is connected to the lower right side of the M5 rectangular block through a revolute joint R20. The third connection position is connected to the upper right side of the M6 ​​rectangular block through a revolute joint R22. The fourth connection position is connected to the upper left side of the M8 rectangular block through a revolute joint R24.

[0025] like Figure 8 As shown, in the fourth plane on the right, the fourth group of hexagonal-like connecting modules is connected to the fourth group of rectangular connecting modules. The first connection position of the hexagonal-like connecting module is connected to the lower rear edge of the M2 rectangular block via a revolute joint R25. The second connection position is connected to the lower front edge of the M7 rectangular block via a revolute joint R28. The third connection position is connected to the upper front edge of the M8 rectangular block via a revolute joint R30. The fourth connection position is connected to the upper rear edge of the M4 rectangular block via a revolute joint R32.

[0026] like Figure 9 As shown, in the fifth plane on the upper side, the fifth group of hexagonal-like connecting modules is connected to the fifth group of rectangular connecting modules. The first connection position of the hexagonal-like connecting module is connected to the front right side of the M5 rectangular block through a revolute joint R33. The second connection position is connected to the front left side of the M7 rectangular block through a revolute joint R36. The third connection position is connected to the rear left side of the M2 rectangular block through a revolute joint R38. The fourth connection position is connected to the rear right side of the M1 rectangular block through a revolute joint R40.

[0027] like Figure 10 As shown, in the sixth plane on the lower side, the sixth group of hexagonal-like connecting modules is connected to the sixth group of rectangular connecting modules. The first connection position of the hexagonal-like connecting module is connected to the rear right side of the M3 rectangular block through a revolute joint R41, the second connection position is connected to the rear left side of the M4 rectangular block through a revolute joint R44, the third connection position is connected to the front left side of the M8 rectangular block through a revolute joint R46, and the fourth connection position is connected to the front right side of the M6 ​​rectangular block through a revolute joint R48.

[0028] In this embodiment, each group of hexagonal connection modules has four folding trends and four states when fully folded; the first folding trend, when fully folded, is that the side of the upper left first type of right-angled triangular prism with the right-angled hypotenuse coincides with the side of the upper second type of right-angled triangular prism, the side of the lower right first type of right-angled triangular prism with the side of the lower second type of right-angled triangular prism, and the side of the left second type of right-angled triangular prism with the side of the right second type of right-angled triangular prism, such as... Figure 11 As shown; the second folding trend, when fully folded, is that the side of the first type of right-angled triangular prism on the upper left coincides with the side of the second type of right-angled triangular prism on the left; the side of the first type of right-angled triangular prism on the lower right coincides with the side of the second type of right-angled triangular prism on the right; and the side of the second type of right-angled triangular prism on the upper right coincides with the side of the second type of right-angled triangular prism on the lower right. Figure 12 As shown; the third folding trend, when fully folded, is that the side of the upper left first type right-angled triangular prism containing the right-angled hypotenuse coincides with the side of the upper second type right-angled triangular prism containing the right-angled hypotenuse; the side of the lower right first type right-angled triangular prism containing the right-angled hypotenuse coincides with the side of the right second type right-angled triangular prism containing the right-angled hypotenuse; and the side of the left second type right-angled triangular prism containing the right-angled hypotenuse coincides with the side of the lower second type right-angled triangular prism containing the right-angled hypotenuse. Figure 13 As shown; the fourth folding trend, when fully folded, is that the side of the first type of right-angled triangular prism on the upper left coincides with the side of the second type of right-angled triangular prism on the left; the side of the first type of right-angled triangular prism on the lower right coincides with the side of the second type of right-angled triangular prism on the lower right; and the side of the second type of right-angled triangular prism on the upper right coincides with the side of the second type of right-angled triangular prism on the right. Figure 14 As shown. The four folding trends of each group of hexagonal connection modules are independent of each other and can be combined arbitrarily. Each deformation mode formed can achieve single-degree-of-freedom folding, and the deformation modes of different folding trends will obtain different load-bearing characteristics.

[0029] In this embodiment, the six sets of hexagonal connecting modules all exhibit the first folding trend, which significantly enhances their left and right side load-bearing capacity when fully folded. Figure 15 As shown; when all six groups of hexagonal connecting modules are in the second folding trend and fully folded, their load-bearing capacity on the upper and lower sides can be significantly improved, such as... Figure 16 As shown, each group of hexagonal connection modules has four folding trends, which can be changed as needed to improve the local and overall load-bearing capacity of the model.

[0030] In this embodiment, all deformation modes formed by the combination of the four folding trends of each group of hexagonal connection modules can achieve simultaneous shrinkage in three directions during the folding process, folding to the minimum volume state with a single degree of freedom.

[0031] In this embodiment, the units formed by the eight rectangular blocks and thirty-six right-angled triangular prisms are used as basic units, and large structures can be infinitely expanded by arraying them in the same connection method to obtain large structures.

[0032] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0033] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0034] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0035] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A single-degree-of-freedom tensile structural unit with multiple deformation modes, characterized in that: The unit has a cube-like structure, consisting of eight rectangular blocks and thirty-six right-angled triangular prisms with isosceles right-angled triangles as their bases. The eight rectangular blocks are positioned at the eight vertices of the cube. Four rectangular blocks on each side of the unit form a rectangular block module. Every six right-angled triangular prisms connected together form a closed-loop hexagonal connection module. The thirty-six right-angled triangular prisms form six hexagonal connection modules. The four rectangular blocks in each group are connected by a hexagonal connection module. Of the thirty-six right-angled triangular prisms, twelve have three sides connecting their two bases that can be used as connecting edges; these are called the first type of right-angled triangular prisms, where the right-angled side is the first connecting edge, and the remaining two sides are the second... The second and third connecting edges; of the remaining twenty-four right-angled triangular prisms, all but the right-angled sides of the three sides connecting the two bases can serve as connecting edges, namely the first connecting edge and the second connecting edge, referred to as the second type of right-angled triangular prism; each group of hexagonal connecting modules consists of two first-type right-angled triangular prisms and four second-type right-angled triangular prisms, with the upper bases of the two first-type right-angled triangular prisms and the four second-type right-angled triangular prisms located in the same plane, and their lower bases also located in the same plane; each group of hexagonal connecting modules has four folding tendencies and four states when fully folded; the first folding tendency, when fully folded, is the side containing the right-angled hypotenuse of the upper left first-type right-angled triangular prism and the side containing the right-angled hypotenuse of the upper second-type right-angled triangular prism. The faces overlap: the side of the lower right first-type right-angled triangular prism containing the right-angled hypotenuse overlaps with the side of the lower second-type right-angled triangular prism; the side of the left second-type right-angled triangular prism containing the right-angled hypotenuse overlaps with the side of the right second-type right-angled triangular prism. The second folding trend, when fully folded, has the side of the upper left first-type right-angled triangular prism containing the right-angled hypotenuse overlap with the side of the left second-type right-angled triangular prism; the side of the lower right first-type right-angled triangular prism containing the right-angled hypotenuse overlaps with the side of the right second-type right-angled triangular prism; the side of the upper second-type right-angled triangular prism containing the right-angled hypotenuse overlaps with the side of the lower second-type right-angled triangular prism. The third folding trend, when fully folded, has the side of the upper left first-type right-angled triangular prism... The side containing the right-angled hypotenuse coincides with the side containing the right-angled hypotenuse of the upper second type right-angled triangular prism; the side containing the right-angled hypotenuse of the lower right first type right-angled triangular prism coincides with the side containing the right-angled hypotenuse of the right second type right-angled triangular prism; the side containing the right-angled hypotenuse of the left second type right-angled triangular prism coincides with the side containing the right-angled hypotenuse of the lower second type right-angled triangular prism. The fourth folding trend, when fully folded, is as follows: the side containing the right-angled hypotenuse of the upper left first type right-angled triangular prism coincides with the side containing the right-angled hypotenuse of the left second type right-angled triangular prism; the side containing the right-angled hypotenuse of the lower right first type right-angled triangular prism coincides with the side containing the right-angled hypotenuse of the lower second type right-angled triangular prism; the side containing the right-angled hypotenuse of the upper second type right-angled triangular prism coincides with the side containing the right-angled hypotenuse of the right second type right-angled triangular prism.

2. The single-degree-of-freedom tensile structural unit with multiple deformation modes according to claim 1, characterized in that: In each group of hexagonal connection modules, the corresponding connecting edges of two adjacent right-angled triangular prisms are connected by a revolute joint; the corresponding connecting edges of each group of hexagonal connection modules and the corresponding group of rectangular block modules are also connected by a revolute joint.

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