Expandable and foldable single-degree-of-freedom polygonal prism

Abstract

The present invention relates to an expandable, foldable single-degree-of-freedom polygonal prism, comprising a bottom unit and a node unit. Two bottom units are directly connected to form a basic prism, and the two bottom units are connected via at least one node unit connected in sequence to form an extended prism; the bottom unit comprises a bottom module and a side module, and the node unit comprises two side modules; the bottom module comprises two symmetrically arranged triangular plates A and two symmetrically arranged triangular plates B, and the side module comprises two symmetrically arranged rectangular plates A and two symmetrically arranged rectangular plates B. This design has a single degree of freedom, a large expandable ratio, is foldable, and can be infinitely expanded. After unfolding, it can be completely closed and self-locked, has good stability, and is easy to transport and store.

Description

Technical Field

[0001] The invention relates to an expandable and foldable single-degree-of-freedom polygonal prism. Background Art

[0002] The expandable structure can adapt to a variety of working conditions by changing its own shape. It has the advantages of large folding and unfolding ratio, easy transportation and storage, etc. It not only has broad application prospects in aerospace, civil construction, military engineering and other fields, but also has many applications in life and rescue.

[0003] Polyhedral structures are widely used due to their good symmetry, but existing polyhedral structures are either large in size when empty and not convenient for transportation, such as containers, or have complex folding processes, many degrees of freedom, and are difficult to control, such as foldable tents. These characteristics greatly limit the application of polyhedral structures. Summary of the invention

[0004] The purpose of the present invention is to provide an expandable and foldable single-degree-of-freedom polygonal prism in view of the above shortcomings.

[0005] The solution adopted by the present invention to solve the technical problem is an expandable foldable single-degree-of-freedom polygonal prism, comprising a base unit and a node unit, wherein two base units are directly connected to form a basic prism, and the two base units are connected via at least one node unit connected in sequence to form an extended prism;

[0006] The bottom unit includes a bottom module and a side module, and the section unit includes two side modules;

[0007] The bottom module includes two symmetrically arranged triangular plates A and two symmetrically arranged triangular plates B, and the side module includes two symmetrically arranged rectangular plates A and two symmetrically arranged rectangular plates B;

[0008] A boss of the same thickness as the plate is provided in the middle of one side of the triangle plate A, and the three sides of the triangle plate A are respectively a side connecting side A, a first bottom connecting side A, and a second bottom connecting side A, the first bottom connecting side A is provided on the surface of the boss, the side connecting side A and the second bottom connecting side A are on the upper surface of the plate, the angle between the side connecting side A and the second bottom connecting side A is a, and the angle between the first bottom connecting side A and the second bottom connecting side A is b, and the three sides of the triangle plate B are respectively a side connecting side B, a first bottom connecting side B, and a second bottom connecting side B, the first bottom connecting side B is on the lower surface of the plate, the side connecting side B and the second bottom connecting side B are on the upper surface of the plate, the angle between the side connecting side B and the second bottom connecting side B is c, and the angle between the first bottom connecting side B and the second bottom connecting side B is d, wherein a and c are equal, and the sum of b and d is 180 degrees;

[0009] A short side and a long side of the rectangular plate A of the bottom unit are respectively a short connecting side A and a long connecting side A, a connection node of the other short side and the other long side of the rectangular plate A forms an external connecting point A, and the short connecting side A, the long connecting side A and the external connecting point A are all on the upper surface of the plate, a short side and a long side of the rectangular plate B of the bottom unit are respectively a short connecting side B and a long connecting side B, a connection node of the other short side of the rectangular plate B and the other long side forms an external connecting point B, the short connecting side B and the long connecting side B are on the upper surface of the plate, and the external connecting point B is on the lower surface of the plate;

[0010] A short side and a long side of the rectangular plate A of the node unit are respectively a short connecting side A and a long connecting side A, the connection nodes of the other short side of the rectangular plate A and the two long sides form an inner connecting point A and an outer connecting point A respectively, the short connecting side A, the inner connecting point A and the outer connecting point A are on the upper surface of the plate, and the long connecting side A is on the lower surface of the plate, a short side of the rectangular plate B of the node unit is a short connecting side B, the connection nodes of the other short side of the rectangular plate B and the two long sides form an inner connecting point B and an outer connecting point B respectively, the inner connecting point B and the outer connecting point B are on the upper surface of the plate, and the short connecting side B is on the lower surface of the plate;

[0011] The middle parts of the first bottom connecting sides A of two adjacent triangle plates A are connected via a revolving pair, the middle parts of the first bottom connecting sides B of two adjacent triangle plates B are connected via a revolving pair, and the middle parts of the second bottom connecting sides A of triangle plate A are connected to the middle parts of the second bottom connecting sides B of adjacent triangle plates B via a revolving pair;

[0012] The short connecting side A of the side module is connected to the middle part of the short connecting side B via a rotating pair;

[0013] The middle parts of the long connecting sides A and B of the side modules on the bottom unit are respectively connected to the middle parts of the side connecting sides A and B of the bottom module via a rotating pair;

[0014] The middle part of the short connecting side A of the side module on the node unit is connected to the middle part of the short connecting side B via a rotating pair, and the middle part of the long connecting side A of the side module on the node unit is connected to the middle part of the long connecting side A of the adjacent side module via a rotating pair;

[0015] Adjacent internal connection points A on adjacent side modules are connected via ball pairs, adjacent internal connection points B on adjacent side modules are connected via ball pairs, adjacent external connection points A on two adjacent units are connected via ball pairs, and adjacent external connection points B on two adjacent units are connected via ball pairs.

[0016] Furthermore, the short sides of the rectangular plate A and the rectangular plate B are of equal length, the long side of the rectangular plate A and the side connecting side A of the triangular plate A are of equal length, the long side of the rectangular plate B and the side connecting side B of the triangular plate B are of equal length, the first bottom connecting side A and the first bottom connecting side B are of equal length, and the second bottom connecting side A and the second bottom connecting side B are of equal length.

[0017] Furthermore, when the difference between b and a is 90 degrees, the bottom module is an isosceles triangle, and the basic prism and the extended prism are triangular prisms.

[0018] Furthermore, when the difference between b and a is not 90 degrees, the bottom module is kite-shaped, and the basic prism and the extended prism are quadrangular prisms.

[0019] Compared with the prior art, the present invention has the following beneficial effects: it has a single degree of freedom, a large deployable ratio, is foldable, can be infinitely expanded, can be completely closed and self-locked after being unfolded, has good stability, and is easy to transport and store. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the structure of the upper left plate of the bottom unit.

[0022] Figure 2 It is a schematic diagram of the structure of the lower left plate of the bottom unit.

[0023] Figure 3 It is a schematic diagram of the structure of the lower right plate of the bottom unit.

[0024] Figure 4 It is a schematic diagram of the structure of the upper right plate of the bottom unit.

[0025] Figure 5 Schematic diagram of the structure of the first side plate of the bottom unit.

[0026] Figure 6 2 is a schematic structural diagram of the second side plate of the bottom unit.

[0027] Figure 7 Schematic diagram of the structure of the third side plate of the bottom unit.

[0028] Figure 8 Schematic diagram of the structure of the fourth side plate of the bottom unit.

[0029] Fig. 9 It is a schematic diagram of the bottom unit structure.

[0030] Fig.10 The basic prism is in a folded state of a triangular prism.

[0031] Fig.11 This is a diagram of the unfolding process of the basic prism being a triangular prism.

[0032] Fig.12 This is the expanded diagram of the basic prism being a triangular prism.

[0033] Fig.13 The basic prism is in a folded state of a quadrangular prism.

[0034] Fig.14 This is a diagram of the expansion process of the basic prism into a quadrangular prism.

[0035] Fig.15This is the expanded diagram of the basic prism being a quadrangular prism.

[0036] Fig.16 It is a schematic diagram of the first side plate structure of the node unit.

[0037] Fig.17 Schematic diagram of the second side plate structure of the node unit.

[0038] Fig.18 It is a schematic diagram of the structure of the third side plate of the node unit.

[0039] Fig.19 It is a schematic diagram of the structure of the fourth side plate of the node unit.

[0040] Fig. 20 It is a schematic diagram of the structure of the node unit.

[0041] Fig.21 It is a schematic diagram of the structure of an extended prism.

[0042] In the figure: C1 - first side plate of bottom unit, C2 - second side plate of bottom unit, C3 - third side plate of bottom unit, C4 - fourth side plate of bottom unit, D1 - upper left plate of bottom unit, D2 - lower left plate of bottom unit, D3 - lower right plate of bottom unit, D4 - upper right plate of bottom unit, J1 - first side plate of node unit, J2 - first side plate of node unit, J3 - first side plate of node unit, J4 - first side plate of node unit, r1 - first rotation pair, r2 - second rotation pair. R3- the third rotation pair, R4- the fourth rotation pair, R5- the fifth rotation pair, R6- the sixth rotation pair, R7- the seventh rotation pair, R8- the eighth rotation pair, R9- the ninth rotation pair, R10- the tenth rotation pair, R11- the eleventh rotation pair, R12- the twelfth rotation pair, R13- the thirteenth rotation pair, R14- the fourteenth rotation pair, R15- the fifteenth rotation pair, R16- the sixteenth rotation pair, R17- the seventeenth rotation pair, R18- the eighteenth rotation pair, R19- the nineteenth rotation pair, R20- the twentieth rotation pair, R21- the twenty-first rotation pair, R22- the twenty-second rotation pair, R23- the twenty-third rotation pair, R24- the twenty-fourth rotation pair, R25- the twenty-fifth rotation pair, R26- the twenty-sixth rotation pair. q1-first ball pair, q2-second ball pair, q3-third ball pair, q4-fourth ball pair, q5-fifth ball pair, q6-sixth ball pair, q7-seventh ball pair, q8-eighth ball pair. A1A2-long connecting edge A of the first side plate of the bottom unit, A2A3-short connecting edge A of the first side plate of the bottom unit, A4-external connecting point A of the first side plate of the bottom unit, A5A6-long connecting edge B of the second side plate of the bottom unit, A6A7-short connecting edge B of the second side plate of the bottom unit, A8-external connecting point B of the second side plate of the bottom unit, A9A10-long connecting edge B of the third side plate of the bottom unit, A10A11-short connecting edge B of the third side plate of the bottom unit, A12-external connecting point B of the third side plate of the bottom unit, A13A14-long connecting edge A of the fourth side plate of the bottom unit, A14A15-short connecting edge A of the fourth side plate of the bottom unit, A16-external connecting point A of the fourth side plate of the bottom unit. B1B2-side connecting edge A of the upper left plate of the bottom unit, B2B3-the second bottom connecting edge A of the upper left plate of the bottom unit, B4B5-the first bottom connecting edge A of the upper left plate of the bottom unit, B6B7-the second bottom connecting edge B of the lower left plate of the bottom unit, B7B8-side connecting edge B of the lower left plate of the bottom unit, B9B10-the first bottom connecting edge B of the lower left plate of the bottom unit, B11B12-the second bottom connecting edge B of the lower right plate of the bottom unit, B12B13-side connecting edge B of the lower right plate of the bottom unit, B14B15-the first bottom connecting edge B of the lower right plate of the bottom unit, B16B17-side connecting edge A of the upper right plate of the bottom unit, B17B18-the second bottom connecting edge A of the upper right plate of the bottom unit, B19B20-the first bottom connecting edge A of the upper right plate of the bottom unit.E1-external connection point A of the first side panel of the node, E2E3-short connection edge of the first side panel of the node, E4-internal connection point of the first side panel of the node, E5E6-long connection edge A of the first side panel of the node, E7-internal connection point B of the second side panel of the node, E8E9-short connection edge B of the second side panel of the node, E10-external connection point B of the second side panel of the node, E11-external connection point B of the third side panel of the node, E12E13-short connection edge B of the third side panel of the node, E14-internal connection point B of the third side panel of the node, E15-external connection point A of the fourth side panel of the node, E16E17-short connection edge A of the fourth side panel of the node, E18-internal connection point A of the fourth side panel of the node, E19E20-long connection edge A of the fourth side panel of the node. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] like Figure 1-21 As shown, an expandable, foldable, single-degree-of-freedom polygonal prism comprises a base unit and a node unit. Two base units are directly connected to form a basic prism, and the two base units are connected via at least one node unit connected in sequence to form an extended prism.

[0045] The bottom unit includes a bottom module and a side module, and the section unit includes two side modules;

[0046] The bottom module includes two symmetrically arranged triangular plates A and two symmetrically arranged triangular plates B, and the side module includes two symmetrically arranged rectangular plates A and two symmetrically arranged rectangular plates B;

[0047] A boss of the same thickness as the plate is provided in the middle of one side of the triangle plate A, and the three sides of the triangle plate A are respectively a side connecting side A, a first bottom connecting side A, and a second bottom connecting side A, the first bottom connecting side A is provided on the surface of the boss, the side connecting side A and the second bottom connecting side A are on the upper surface of the plate, the angle between the side connecting side A and the second bottom connecting side A is a, and the angle between the first bottom connecting side A and the second bottom connecting side A is b, and the three sides of the triangle plate B are respectively a side connecting side B, a first bottom connecting side B, and a second bottom connecting side B, the first bottom connecting side B is on the lower surface of the plate, the side connecting side B and the second bottom connecting side B are on the upper surface of the plate, the angle between the side connecting side B and the second bottom connecting side B is c, and the angle between the first bottom connecting side B and the second bottom connecting side B is d, wherein a and c are equal, and the sum of b and d is 180 degrees;

[0048] A short side and a long side of the rectangular plate A of the bottom unit are respectively a short connecting side A and a long connecting side A, a connection node of the other short side and the other long side of the rectangular plate A forms an external connecting point A, and the short connecting side A, the long connecting side A and the external connecting point A are all on the upper surface of the plate, a short side and a long side of the rectangular plate B of the bottom unit are respectively a short connecting side B and a long connecting side B, a connection node of the other short side of the rectangular plate B and the other long side forms an external connecting point B, the short connecting side B and the long connecting side B are on the upper surface of the plate, and the external connecting point B is on the lower surface of the plate;

[0049] A short side and a long side of the rectangular plate A of the node unit are respectively a short connecting side A and a long connecting side A, the connection nodes of the other short side of the rectangular plate A and the two long sides form an inner connecting point A and an outer connecting point A respectively, the short connecting side A, the inner connecting point A and the outer connecting point A are on the upper surface of the plate, and the long connecting side A is on the lower surface of the plate, a short side of the rectangular plate B of the node unit is a short connecting side B, the connection nodes of the other short side of the rectangular plate B and the two long sides form an inner connecting point B and an outer connecting point B respectively, the inner connecting point B and the outer connecting point B are on the upper surface of the plate, and the short connecting side B is on the lower surface of the plate;

[0050] The middle parts of the first bottom connecting sides A of two adjacent triangle plates A are connected via a revolving pair, the middle parts of the first bottom connecting sides B of two adjacent triangle plates B are connected via a revolving pair, and the middle parts of the second bottom connecting sides A of triangle plate A are connected to the middle parts of the second bottom connecting sides B of adjacent triangle plates B via a revolving pair;

[0051] The short connecting side A of the side module is connected to the middle part of the short connecting side B via a rotating pair;

[0052] The middle parts of the long connecting sides A and B of the side modules on the bottom unit are respectively connected to the middle parts of the side connecting sides A and B of the bottom module via a rotating pair;

[0053] The middle part of the short connecting side A of the side module on the node unit is connected to the middle part of the short connecting side B via a rotating pair, and the middle part of the long connecting side A of the side module on the node unit is connected to the middle part of the long connecting side A of the adjacent side module via a rotating pair;

[0054] Adjacent internal connection points A on adjacent side modules are connected via ball pairs, adjacent internal connection points B on adjacent side modules are connected via ball pairs, adjacent external connection points A on two adjacent units are connected via ball pairs, and adjacent external connection points B on two adjacent units are connected via ball pairs.

[0055] In this embodiment, the short sides of the rectangular plate A and the rectangular plate B are of equal length, the long side of the rectangular plate A and the side connecting side A of the triangular plate A are of equal length, the long side of the rectangular plate B and the side connecting side B of the triangular plate B are of equal length, the first bottom connecting side A and the first bottom connecting side B are of equal length, and the second bottom connecting side A and the second bottom connecting side B are of equal length.

[0056] In this embodiment, when the difference between b and a is 90 degrees, the bottom module is an isosceles triangle, and the basic prism and the extended prism are triangular prisms.

[0057] In this embodiment, when the difference between b and a is not 90 degrees, the bottom module is kite-shaped, and the basic prism and the extended prism are quadrangular prisms.

[0058] In this embodiment, the two triangular plates A of the bottom module of the bottom unit are the upper left plate D1 and the upper right plate D4, the two triangular plates B of the bottom module are the lower left plate D2 and the lower right plate D3, the two rectangular plates A of the side module are the first side plate C1 and the fourth side plate C4, and the two rectangular plates B of the side module are the second side plate C2 and the third side plate C3.

[0059] Figure 1 The upper left plate D1 has three connecting edges, namely a side connecting edge B1B2, a first bottom connecting edge B4B5, and a second bottom connecting edge B2B3, wherein the angle between B1B2 and B2B3 is a, and the angle between B4B5 and B2B3 is b.

[0060] Figure 2 The lower left bottom plate D2 is shown, having three connecting edges, namely, a side connecting edge B7B8, a first bottom connecting edge B9B10, and a second bottom connecting edge B6B7, wherein the angle between B6B7 and B7B8 is c, and the angle between B9B10 and B6B7 is d.

[0061] Figure 3 The lower right plate D3 is shown, which has three connecting edges, namely the side connecting edge B12B13, the first bottom connecting edge B14B15, and the second bottom connecting edge B11B12, wherein the angle between B11B12 and B12B13 is c, and the angle between B11B12 and B14B15 is d.

[0062] Figure 4 The upper right plate D4 is shown, having three connecting edges, namely, a side connecting edge B16B17, a first bottom connecting edge B19B20, and a second bottom connecting edge B17B18, wherein the angle between B16B17 and B17B18 is a, and the angle between B17B18 and B19B20 is b.

[0063] Figure 5 The first side plate C1 of the bottom unit is shown, A2A3 is the short connecting edge A, A1A2 is the long connecting edge A, and A4 is the external connecting point A.

[0064] Figure 6 The second side plate C2 of the bottom unit is shown, A6A7 is the short connecting edge B, A5A6 is the long connecting edge B, and A8 is the outer connecting point B.

[0065] Figure 7 The third side panel C3 of the bottom unit is shown, A10A11 is the short connecting edge B, A9A10 is the long connecting edge B, and A12 is the external connecting point B.

[0066] Figure 8The fourth side plate C4 of the bottom unit is shown, A14A15 is the short connecting edge A, A13A14 is the long connecting edge A, and A16 is the external connecting point A.

[0067] Fig. 9 The structural schematic diagram of the bottom unit is shown, D1 and D2 are connected to each other through the second rotation pair r2 or the twelfth rotation pair r12, D2 and D3 are connected to each other through the third rotation pair r3 or the thirteenth rotation pair r13, D3 and D4 are connected to each other through the fourth rotation pair r4 or the fourteenth rotation pair r14, D1 and D4 are connected to each other through the first rotation pair r1 or the eleventh rotation pair r11, D1 and C1 are connected to each other through the fifth rotation pair r5 or the fifteenth rotation pair r15, D2 and C2 are connected to each other through the sixth rotation pair r6 or the sixteenth rotation pair r16, D3 and C3 are connected to each other through the seventh rotation pair r7 or the seventeenth rotation pair r17, D4 and C4 are connected to each other through the eighth rotation pair r8 or the eighteenth rotation pair r18, C1 and C2 are connected to each other through the ninth rotation pair r9 or the nineteenth rotation pair r19, and C3 and C4 are connected to each other through the tenth rotation pair r10 or the twentieth rotation pair r20.

[0068] Figure 10-15 A schematic diagram of a basic prism is shown, wherein C1 of a bottom unit and C4 of another bottom unit are connected to each other through a first ball pair q1, C2 of a bottom unit and C3 of another bottom unit are connected to each other through a second ball pair q2, C3 of a bottom unit and C2 of another bottom unit are connected to each other through a third ball pair q3, and C4 of a bottom unit and C1 of another bottom unit are connected to each other through a fourth ball pair q4.

[0069] in Fig.10 The basic prism is shown as a triangular prism in its folded state. Fig.11 The diagram shows the expansion process of the basic prism into a triangular prism. Fig.12 The expanded view of the base prism, which is a triangular prism, is shown. Fig.13 The basic prism is shown in its folded state as a quadrangular prism. Fig.14 The diagram shows the expansion process of the basic prism into a quadrangular prism. Fig.15 The expanded view of the base prism as a quadrangular prism is shown.

[0070] In the process from the unfolded state to the folded state, the upper surface of D1 and the upper surface of D2 gradually approach each other until they overlap, the upper surface of D4 and the upper surface of D3 gradually approach each other until they overlap, the boss surface of D1 and the boss surface of D4 gradually approach each other until they overlap, the lower surface of D2 and the lower surface of D3 gradually approach each other until they overlap, the upper surface of C1 and the upper surface of C2 gradually approach each other until they overlap, the upper surface of C3 and the upper surface of C4 gradually approach each other until they overlap, and the lower surface of C2 and the lower surface of C3 gradually approach each other until they overlap.

[0071] In this embodiment, the two rectangular plates A of the side module of the segment unit are respectively the first side plate J1 and the fourth side plate J4 , and the two rectangular plates B of the side module are respectively the second side plate J2 and the third side plate J3 .

[0072] Fig.16 The first side plate J1 of the node unit is shown, E2E3 are short connecting edges A, E5E6 are long connecting edges A, E1 and E4 are external connecting points A and internal connecting points A respectively.

[0073] Fig.17 The second side plate J2 of the node unit is shown, E8E9 are short connecting edges B, E7 and E10 are external connecting point B and internal connecting point B respectively.

[0074] Fig.18 The third side plate J3 of the node unit is shown, E12E131 are short connecting edges B, E11 and E14 are external connecting points B and internal connecting points B respectively.

[0075] Fig.19 The fourth side plate J4 of the node unit is shown, E16E17 are short connecting edges A, E19E20 are long connecting edges A, E15 and E18 are external connecting points A and internal connecting points A respectively.

[0076] Fig. 20 The structural schematic diagram of the node unit is shown, J1 and J2 are connected to each other through the twenty-third rotation pair r23 or the twenty-fifth rotation pair r25, J3 and J4 are connected to each other through the twenty-fourth rotation pair r24 or the twenty-sixth rotation pair r26, J1 and J4 are connected to each other through the fifth ball pair q5 or the eighth ball pair q8, and J2 and J3 are connected to each other through the sixth ball pair q6 or the seventh ball pair q7.

[0077] Fig.21 The schematic diagram of the structure of the extended prism in the thin plate mode is shown, wherein C1 of the bottom unit and J4 of the node unit are connected to each other through the first ball pair q1, C2 of the bottom unit and J3 of the node unit are connected to each other through the second ball pair q2, C3 of the bottom unit and J2 of the node unit are connected to each other through the third ball pair q3, and C4 of the bottom unit and J1 of the node unit are connected to each other through the fourth ball pair q4.

[0078] In this embodiment, in the extended prism mode, during the process from the unfolded state to the folded state, the movement rules of the bottom unit and the basic prism mode are the same, but the node unit will be slightly deformed, wherein the upper surface of J1 and the upper surface of J2 gradually approach each other until they overlap, the upper surface of J3 and the upper surface of J4 gradually approach each other until they overlap, and the lower surface of J2 and the lower surface of J3 gradually approach each other until they overlap.

[0079] In this embodiment, the secondary rotation axis connecting the left upper plate and the left lower plate and the secondary rotation axis connecting the right upper plate and the right lower plate in the bottom module always intersect at one point during the folding process.

[0080] In this embodiment, the rotation secondary axis connecting the upper left plate and the lower left plate of the same bottom module, the rotation secondary axis connecting the above-mentioned upper left plate and the first side plate connected thereto, the rotation secondary axis connecting the above-mentioned lower left plate and the second side plate connected thereto, and the rotation secondary axis connecting the above-mentioned two side plates always intersect at one point during the folding process; the rotation secondary axis connecting the upper right plate and the lower right plate of the same bottom module, the rotation secondary axis connecting the above-mentioned upper right plate and the fourth side plate connected thereto, the rotation secondary axis connecting the above-mentioned lower right plate and the third side plate connected thereto, and the rotation secondary axis connecting the above-mentioned two side plates always intersect at one point during the folding process.

[0081] This design is expandable and infinitely expandable. It has a single degree of freedom during the folding process. When fully folded, it is in a flat state, which is convenient for processing, installation, storage and transportation. When fully unfolded, it is a fully closed polygonal prism that can self-lock and withstand large external forces. It can be used as a rescue tent or storage box. The entire structure is simple, flexible, and has the advantages of good stability. It has important significance and broad application prospects in aerospace and civil engineering.

[0082] If this patent discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or as: a non-detachable fixed connection (for example, riveting, welding). Of course, the fixed connection can also be replaced by an integrated structure (for example, manufactured by a casting process) (except when it is obviously impossible to use an integrated forming process).

[0083] In the description of this patent, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0084] The preferred embodiments listed above further illustrate the objectives, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An expandable, foldable, single-degree-of-freedom polygonal prism, characterized in that: It comprises a bottom unit and a node unit, wherein two bottom units are directly connected to form a basic prism, and the two bottom units are connected via at least one node unit connected in sequence to form an extended prism; The bottom unit includes a bottom module and a side module, and the section unit includes two side modules; The bottom module includes two symmetrically arranged triangular plates A and two symmetrically arranged triangular plates B, and the side module includes two symmetrically arranged rectangular plates A and two symmetrically arranged rectangular plates B; A boss of the same thickness as the plate is provided in the middle of one side of the triangle plate A, and the three sides of the triangle plate A are respectively a side connecting side A, a first bottom connecting side A, and a second bottom connecting side A, the first bottom connecting side A is provided on the surface of the boss, the side connecting side A and the second bottom connecting side A are on the upper surface of the plate, the angle between the side connecting side A and the second bottom connecting side A is a, and the angle between the first bottom connecting side A and the second bottom connecting side A is b, and the three sides of the triangle plate B are respectively a side connecting side B, a first bottom connecting side B, and a second bottom connecting side B, the first bottom connecting side B is on the lower surface of the plate, the side connecting side B and the second bottom connecting side B are on the upper surface of the plate, the angle between the side connecting side B and the second bottom connecting side B is c, and the angle between the first bottom connecting side B and the second bottom connecting side B is d, wherein a is equal to c, and the sum of b and d is 180 degrees; A short side and a long side of the rectangular plate A of the bottom unit are respectively a short connecting side A and a long connecting side A, a connection node of the other short side and the other long side of the rectangular plate A forms an external connecting point A, and the short connecting side A, the long connecting side A and the external connecting point A are all on the upper surface of the plate, a short side and a long side of the rectangular plate B of the bottom unit are respectively a short connecting side B and a long connecting side B, a connection node of the other short side of the rectangular plate B and the other long side forms an external connecting point B, the short connecting side B and the long connecting side B are on the upper surface of the plate, and the external connecting point B is on the lower surface of the plate; A short side and a long side of the rectangular plate A of the node unit are respectively a short connecting side A and a long connecting side A, the connection nodes of the other short side of the rectangular plate A and the two long sides form an inner connecting point A and an outer connecting point A respectively, the short connecting side A, the inner connecting point A and the outer connecting point A are on the upper surface of the plate, and the long connecting side A is on the lower surface of the plate, a short side of the rectangular plate B of the node unit is a short connecting side B, the connection nodes of the other short side of the rectangular plate B and the two long sides form an inner connecting point B and an outer connecting point B respectively, the inner connecting point B and the outer connecting point B are on the upper surface of the plate, and the short connecting side B is on the lower surface of the plate; The middle parts of the first bottom connecting sides A of two adjacent triangle plates A are connected via a revolving pair, the middle parts of the first bottom connecting sides B of two adjacent triangle plates B are connected via a revolving pair, and the middle parts of the second bottom connecting sides A of triangle plate A are connected to the middle parts of the second bottom connecting sides B of adjacent triangle plates B via a revolving pair; The short connecting side A of the side module is connected to the middle part of the short connecting side B via a rotating pair; The middle parts of the long connecting sides A and B of the side modules on the bottom unit are respectively connected to the middle parts of the side connecting sides A and B of the bottom module via a rotating pair; The middle part of the short connecting side A of the side module on the node unit is connected to the middle part of the short connecting side B via a rotating pair, and the middle part of the long connecting side A of the side module on the node unit is connected to the middle part of the long connecting side A of the adjacent side module via a rotating pair; Adjacent inner connecting points A on adjacent side modules are connected via ball pairs, adjacent inner connecting points B on adjacent side modules are connected via ball pairs, adjacent outer connecting points A on two adjacent units are connected via ball pairs, and adjacent outer connecting points B on two adjacent units are connected via ball pairs; the short sides of the rectangular plate A and the rectangular plate B are equal in length, the long side of the rectangular plate A and the side connecting side A of the triangular plate A are equal in length, the long side of the rectangular plate B and the side connecting side B of the triangular plate B are equal in length, the first bottom connecting side A and the first bottom connecting side B are equal in length, and the second bottom connecting side A and the second bottom connecting side B are equal in length; when the difference between b and a is 90 degrees, the bottom module is an isosceles triangle, and the basic prism and the extended prism are triangular prisms.

2. The expandable, foldable single-degree-of-freedom polygonal prism according to claim 1, characterized in that: When the difference between b and a is not 90 degrees, the bottom module is kite-shaped, and the basic prism and the extended prism are quadrangular prisms.

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