Pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna

Abstract

The present invention provides a pyramid shear-hinged unit hybrid array type single-degree-of-freedom double-layer peripheral truss foldable antenna, which includes N hexahedral foldable units, N is an integer greater than or equal to three, the N hexahedral foldable units are interconnected and distributed in a circumferential array, and each hexahedral foldable unit includes a first upper faceplate, a second upper faceplate, a first lower faceplate group, a second lower faceplate group, and a shear-hinged support unit. The present invention has a simple structure, all connections are revolute pairs, it is easy to realize engineering manufacturing, has a high degree of structural symmetry, good deployment performance, high reliability, and can be used to construct a support mechanism for a peripheral truss antenna to meet various aviation needs.

Description

Technical Field

[0001] The invention relates to the field of antennas, and in particular to a pyramid shear-hinged unit hybrid array type single-degree-of-freedom double-layer peripheral truss foldable antenna. Background Art

[0002] With the continuous development of my country's aerospace industry, the technology in the aerospace field is also constantly breaking through, and satellite-borne antennas as transmission tools are also receiving more attention. An important application direction of space deployable mechanisms in the aerospace field is to serve as a support and deployment mechanism for satellite-borne large-aperture antennas. The foldable antenna is a type of deployable antenna with the best comprehensive performance in terms of surface accuracy and deployment rate among all types of deployable antennas. With the continuous development of modern science and technology, space deployable antennas are also developing in the direction of high precision, large aperture and light weight. Therefore, the foldable antenna is the main research and development object at present and in the future for a long time.

[0003] At present, the theoretical research on the space deployable antenna mechanism has made certain progress. In developed countries such as the United States, Germany, Russia, and Japan, various types of antennas have been put into orbit. In view of its huge application value and complex technical difficulty, the development level of large space deployable antennas has become an important indicator for measuring the development of aerospace industry in various countries. The National Development and Reform Commission's "Medium- and Long-Term Development Plan for National Civilian Space Infrastructure (2015-2025)" clearly states in "Looking to the future, aiming at international cutting-edge technologies, and focusing on key bottlenecks that restrict development": Develop advanced payloads such as large antennas to comprehensively improve satellite performance.

[0004] The peripheral truss foldable antenna is composed of front and rear cable nets for providing tension, a retractable support mechanism, and a metal reflective surface. The retractable support mechanism determines the caliber of the antenna, and the tension of the front and rear cable nets effectively ensures the overall structural rigidity of the antenna. At present, the support mechanism of the peripheral truss antenna mainly uses a scissor-type mechanism, while the foldable mechanism is less used. The foldable mechanism has the advantages of high rigidity, good mechanical properties, high folding and unfolding ratio, good unfolding performance, and high reliability. Therefore, the support mechanism of the peripheral truss antenna composed of the foldable mechanism has a good development prospect. Summary of the invention

[0005] In order to solve the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a single-degree-of-freedom constrained folding and unfolding unit with few degrees of freedom, simple structure, large folding ratio, high rigidity, good unfolding performance, strong adaptability, high reliability and easy control, and a spatial folding and unfolding mechanism composed of the unit.

[0006] Specifically, the present invention provides a pyramid shear hinge unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna, which includes N hexahedral foldable units, N is an integer greater than or equal to three, the N hexahedral foldable units are interconnected and distributed in a circumferential array, the side projection surface of the hexahedral foldable unit is a trapezoid, and each hexahedral foldable unit includes a first upper faceplate, a second upper faceplate, a first lower faceplate group, a second lower faceplate group and a shear hinge support unit.

[0007] The first lower flower disc group, the first upper flower disc, the second upper flower disc and the second lower flower disc group are sequentially connected to form a hexahedral folding and unfolding unit; the first upper flower disc and the second upper flower disc are parallel to each other and their projections overlap, and the first lower flower disc group and the second lower flower disc group are parallel to each other and their projections overlap;

[0008] The first lower flower disc group and the second lower flower disc group are arranged in a trapezoid on the projection surface, the first upper flower disc is located on a line connecting the center of the trapezoidal circumscribed circle of the first lower flower disc group to the center of the projection surface of the third lower flower disc and the fourth lower flower disc of the first lower flower disc group, and the second upper flower disc is located on a line connecting the center of the trapezoidal circumscribed circle of the second lower flower disc group to the center of the projection surface of the third lower flower disc and the fourth lower disc of the second lower flower disc group;

[0009] The first lower flower disc group and the second lower flower disc group both include four lower flower discs, and the lower flower discs at corresponding positions have the same structure, and the four lower flower discs are respectively a first lower flower disc, a second lower flower disc, a third lower flower disc and a fourth lower flower disc; the first upper flower disc and the four lower flower discs of the first lower flower disc group and the second upper flower disc and the four lower flower discs of the second lower flower disc group are respectively connected by means of a web, and the two ends of the web are respectively rotatably connected to the upper flower disc or the lower flower disc by means of a rotating pair;

[0010] The first lower flower disc and the second lower flower disc, the second lower flower disc and the third lower flower disc, and the first lower flower disc and the fourth lower flower disc of the two lower flower disc groups are respectively connected by means of a group of rotating folding rods, each group of rotating folding rods includes two rotating rods connected together by means of a rotating pair, and the ends of the rotating rods connected to the lower flower discs are respectively rotatably connected to the lower flower discs by means of the rotating pair;

[0011] The first lower flower disc of the first lower flower disc group and the first lower flower disc of the second lower flower disc group are respectively fixedly connected by means of a first connecting rod, and the third lower flower disc and the fourth lower flower disc of the first lower flower disc group and the third lower flower disc and the fourth lower flower disc of the second lower flower disc group are respectively fixedly connected to the shear hinge support unit by means of a second connecting rod;

[0012] The two rotational pairs of each web member are parallel to each other, and the three rotational pairs of each set of rotating folding rods are parallel to each other;

[0013] Two adjacent hexahedral folding units share the first and second lower flower discs of the first and second lower flower disc groups, and the third and fourth lower flower discs of the first and second lower flower disc groups between the two adjacent hexahedral folding units are connected by means of a group of rotating folding rods.

[0014] Preferably, the outer surface of the upper faceplate is evenly provided with four notches for connecting the web rods, and the rotation axis of each notch is parallel to the upper and lower bottom surfaces and is located at the center.

[0015] Preferably, the first lower flower disc and the second lower flower disc have the same structure and are arranged in mirror symmetry, and both include two layers of slots, the first layer of slots are used to connect the belly rod, and the second layer of slots are used to connect the rotating rod, the angle between the two second layer of slots on the inner sides of the first lower flower disc and the second lower flower disc is 360°*(N-2) / N, and the angles between the remaining slots are determined by the projection of the antenna mechanism.

[0016] Preferably, the third lower face disc and the fourth lower face disc have the same structure and are arranged in mirror symmetry, and both include two layers of slots, the first layer of slots is used to connect the belly rod, and the second layer of slots is used to connect the rotating rod, and the angle between the second layer of slots on the outer sides of the third lower face disc and the fourth lower face disc is determined by the projection of the antenna mechanism.

[0017] Preferably, each notch is provided with a through hole, and the through hole is used to be connected to a rod inserted into the notch via a rotation pair.

[0018] Preferably, the size of the truss foldable antenna structure can be changed by adjusting the length of the rotating folding rod and the number of hexahedral folding units; the length of each group of rotating folding rods is positively correlated with the length of the projection surface when the foldable antenna is fully unfolded, and changes with the shape of the projection surface.

[0019] Preferably, the scissor-hinged support unit includes two first scissor-hinged links and four second scissor-hinged links. The two first scissor-hinged links are connected in the middle by a rotating pair to form a scissor-hinged folding rod. The first end of the second scissor-hinged link is connected to the end point of the scissor-hinged folding rod through a rotating pair, and the second end of the second scissor-hinged link is connected to the second connecting rod through a rotating pair. All the rotating pair axes of the scissor-hinged support unit are parallel to each other, and the length of each scissor-hinged link is determined according to the geometric relationship between the folding antenna mechanism being fully unfolded and fully folded.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention is a hexahedral folding unit formed by top-to-top combination of two tetrahedral folding units, which has the characteristics of high rigidity, good mechanical properties, and high folding ratio. In addition, each tetrahedral folding unit is provided with a shear hinge support unit, thereby facilitating angle adjustment, expansion, and folding.

[0022] (2) The present invention is a basic expandable unit in a single-degree-of-freedom space, that is, only one drive is required to realize the expansion and folding movement of the unit, with good expansion performance and high reliability.

[0023] (3) The present invention has a simple structure, and all the moving pairs are rotating pairs, which is easy to implement in engineering manufacturing.

[0024] (4) The present invention has a high degree of structural symmetry. By assembling multiple deployable units, a double-layer peripheral truss foldable antenna mechanism of any size can be formed to meet a variety of aviation needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the fully unfolded state of the pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna of the present invention;

[0026] Figure 2 yes Figure 1 A schematic front view of the fully deployed state;

[0027] Figure 3 yes Figure 1 A schematic diagram of the projection in the fully expanded state;

[0028] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the conventional unfolded state;

[0029] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the fully folded state;

[0030] Figure 6 It is a three-dimensional schematic diagram of the fully unfolded state of the single-degree-of-freedom multi-closed-loop hexahedron folding and unfolding basic unit of the present invention;

[0031] Figure 7 yes Figure 5 Side view of the fully deployed state;

[0032] Figure 8 yes Figure 5 A three-dimensional schematic diagram of the conventional unfolded state;

[0033] Fig. 9 yes Figure 5 A three-dimensional schematic diagram of the fully folded state;

[0034] Fig.10 It is a three-dimensional schematic diagram of the upper faceplate of the present invention;

[0035] Fig.11 It is a schematic three-dimensional diagram of the first lower faceplate or the second lower faceplate of the present invention;

[0036] Fig.12 It is a schematic three-dimensional diagram of the third lower faceplate of the present invention;

[0037] Fig.13 It is a three-dimensional schematic diagram of the shear hinge support unit of the present invention.

[0038] In the figure: A-hexahedral folding and unfolding unit, B-shear hinge support unit, C1-C7-rotation pair, 101-first lower faceplate group, 102-second lower faceplate group, 1-first lower faceplate, 13-second lower faceplate, 2-upper layer rotation rod, 3-fourth lower faceplate, 4-abdominal rod, 5-first upper faceplate, 14-second upper faceplate, 6-third lower faceplate, 7-first connecting rod, 8-lower layer rotation rod, 9-second connecting rod, 11-first scissor hinge connecting rod, 10-second scissor hinge connecting rod, 12-rotation folding rod. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0040] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention provides a pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna, such as Figures 1 to 9 As shown, it includes N hexahedral folding and unfolding units A, N is an integer greater than or equal to three, the N hexahedral folding and unfolding units A are interconnected and distributed in a circumferential array, and each hexahedral folding and unfolding unit A includes a first upper face disc 5, a second upper face disc 14, a first lower face disc group 101, a second lower face disc group 102 and a shear hinge support unit B.

[0043] The first lower flower disc group 101, the first upper flower disc 5, the second upper flower disc 14 and the second lower flower disc group 102 are connected in sequence to form a hexahedral folding unit A; the first upper flower disc 5 and the second upper flower disc 14 are parallel to each other and their projections overlap, and the first lower flower disc group 101 and the second lower flower disc group 102 are parallel to each other and their projections overlap.

[0044] The first lower flower disc group 101 and the second lower flower disc group 102 are arranged in a trapezoid on the projection surface, the first upper flower disc 5 is located on the line connecting the center of the trapezoidal circumscribed circle of the first lower flower disc group 101 to the center of the projection surface of the third lower flower disc and the fourth lower flower disc of the first lower flower disc group 101, and the second upper flower disc 14 is located on the line connecting the center of the trapezoidal circumscribed circle of the second lower flower disc group 102 to the center of the projection surface of the third lower flower disc 6 and the fourth lower flower disc 4 of the second lower flower disc group 102.

[0045] The first lower flower disc group 101 and the second lower flower disc group 102 both include four lower flower discs, and the lower flower discs at corresponding positions have the same structure, and the four lower flower discs are respectively the first lower flower disc 1, the second lower flower disc 13, the third lower flower disc 6, and the fourth lower flower disc 3. The first upper flower disc 5 and the four lower flower discs of the first lower flower disc group 101 and the second upper flower disc 14 and the four lower flower discs of the second lower flower disc group 102 are respectively connected by means of a web 4, and the two ends of the web 4 are rotatably connected to the upper flower disc or the lower flower disc by means of a rotation pair C3 and a rotation pair C4.

[0046] The first lower flower disc and the second lower flower disc, the second lower flower disc and the third lower flower disc, and the first lower flower disc and the fourth lower flower disc of the two lower flower disc groups are respectively connected by means of a group of rotating folding rods 8, and each group of rotating folding rods 8 includes two rotating rods connected together by means of a rotating pair, and the ends of the rotating rods connected to the lower flower discs are respectively rotatably connected to the lower flower discs by means of a rotating pair C1.

[0047] The first lower flower disc of the first lower flower disc group 101 and the first lower flower disc of the second lower flower disc group 102, as well as the second lower flower disc of the first lower flower disc group 101 and the second lower flower disc of the second lower flower disc group 102 are respectively fixedly connected by means of a first connecting rod 7, and the third lower flower disc and the fourth lower flower disc of the first lower flower disc group 101 and the third lower flower disc 6 and the fourth lower flower disc 4 of the second lower flower disc group 102 are respectively fixedly connected to the shear hinge support unit by means of a second connecting rod 9.

[0048] The two rotation pairs of each web member 4 are parallel to each other, and the three rotation pairs of each set of rotating folding rods are parallel to each other.

[0049] Two adjacent hexahedral folding units A share the first lower flower disc and the second lower flower disc of the first lower flower disc group 101 and the second lower flower disc group 102, and the third lower flower disc or the fourth lower flower disc of the first lower flower disc group 101 and the second lower flower disc group 102 between two adjacent hexahedral folding units A is connected by means of a set of rotating folding rods 12. A plurality of hexahedral folding units A are combined in a circular array to form a complete antenna mechanism. The rotating folding rod 12 is formed by two rotating rods connected to each other, and a rotating pair C2 is formed between the two rotating rods, and a rotating pair C1 is formed between the rotating rod and the lower flower disc.

[0050] exist Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The three-dimensional schematic diagram of the pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer perimeter truss foldable antenna shown in the figure includes N=8 single-degree-of-freedom multi-closed-loop hexahedron foldable basic units A, wherein the first lower faceplate and the second lower faceplate are on the inner side, and the third lower faceplate and the fourth lower faceplate are on the outer side. The adjacent hexahedrons are connected by the first lower faceplate and the second lower faceplate of the shared upper layer and the first lower faceplate and the second lower faceplate of the corresponding lower layer and the two groups of rotating folding rods 12 shown in the figure, and this connection is a rotating pair connection. Thus, a pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer perimeter truss foldable antenna is formed.

[0051] exist Figure 6 , Figure 7 , Figure 8 and Fig. 9 In the three-dimensional schematic diagram of the single-degree-of-freedom multi-closed-loop hexahedron folding and unfolding basic unit shown, it includes twelve rotating rods, six rotating rods 2 on the upper layer and six rotating rods 8 on the lower layer, eight abdominal rods 4, eight lower faceplates, six connecting rods, a shear hinge support unit and two upper faceplates. A hexahedron folding and unfolding basic unit can be regarded as two identical quadrangular pyramid folding and unfolding units placed top to top and then connected by six connecting rods and a shear hinge support mechanism, wherein the two first connecting rods 7 are respectively fixed at both ends to the lower faceplate, and the four second connecting rods 9 are fixed at one end to the lower faceplate and the other end is connected to the shear hinge support unit through a rotating pair. In a tetrahedral folding and unfolding unit, the first lower flower disc 1 and the second lower flower disc are completely identical, the third lower flower disc 6 and the fourth lower flower disc 3 have the same structure and are mirror-symmetrical, each lower flower disc has two layers of notches, the first layer is connected to the belly bar 4 through a rotating pair, and the second layer is connected to the rotating folding rod through a rotating pair; the belly bar 4 is completely identical, with a rotating pair at each end; each rotating folding rod group is connected by two rotating rods relying on a rotating pair, and each group has a rotating pair at each end; the upper flower disc has a layer of notches, connected to the belly bar 4 through a rotating pair. The three rotating pairs of each group of rotating folding rods are parallel to each other, and the two rotating pairs of each belly bar 4 are parallel to each other. Thus, a hexahedral folding and unfolding basic unit is formed.

[0052] exist Fig.10 In the upper faceplate 5 shown, a plurality of slots 51 for connecting the web rod rotation pair are provided, the rotation axis of each slot is parallel to the upper and lower bottom surfaces and is located at the center, and each side of the slot is perpendicular to the upper and lower bottom surfaces; the angle between the slots of the upper faceplate is determined by the projection of the basic folding and unfolding unit of the hexahedron, and the direction of each slot is the extension line direction of the upper faceplate to the four lower faceplates.

[0053] exist Fig.11 In the first lower faceplate and the second lower faceplate shown, the first lower faceplate and the second lower faceplate have the same structure and are both provided with two layers of notches. The first layer of notches 11 is used to connect the web rod rotation pair, and the second layer of notches 12 is used to connect the notches of the rotation pair of the rotating folding rod. In the figure, the first layer of notches is schematically shown. The rotation axis of the first layer of notches is parallel to the upper and lower bottom surfaces and is 3mm away from the upper bottom surface. The rotation axis of the second layer of notches is parallel to the upper and lower bottom surfaces and is located at the center. Each surface of each layer of notches is perpendicular to the upper and lower bottom surfaces. The angle between each notch in the first lower faceplate and the second lower faceplate is determined by the projection of the pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss folding antenna. The first lower faceplate is located at the inner vertex of the projected trapezoid. The direction of the first layer of notches is the direction of the extension line of the first and second lower faceplates upward, and the direction of the second layer of notches is the direction of the extension line of the first and second lower faceplates to other lower faceplates. The angle between the outermost second layer of notches and its opposite side is 360°*(N-2) / N.

[0054] exist Fig.12 In the third lower faceplate shown, the third lower faceplate and the fourth lower faceplate are mirror-symmetrical and are both provided with two layers of notches. The first layer of notches 61 is used to connect the web rod rotation pair, and the second layer of notches 62 is used to connect the notches of the rotation pair of the rotating folding rod. In the figure, the first layer of notches is schematically shown. The rotation axis of the first layer of notches is parallel to the upper and lower bottom surfaces and is 3mm away from the upper bottom surface. The rotation axis of the second layer of notches is parallel to the upper and lower bottom surfaces and is located at the center. Each side of each layer of notches is perpendicular to the upper and lower bottom surfaces. The angle between the two second layer notches on the outside of the third lower faceplate and the fourth lower faceplate is 360°-(360°*(2N-2) / 2N). The angles between the remaining notches are determined by the projection of the pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss folding antenna. The third and fourth lower faceplates need to be located at the outer vertices of the projected trapezoid. The direction of the first layer of notches is the direction of the extension line of the third and fourth lower faceplates upward, and the direction of the second layer of notches is the direction of the extension line of the third and fourth lower faceplates to other lower faceplates.

[0055] exist Fig.13In the scissor hinge support mechanism shown, the scissor hinge support unit is composed of six connecting rods, and the six connecting rods are divided into two types. Two first scissor hinge connecting rods 11 are provided, and the middle of the two first scissor hinge connecting rods are connected by a rotating pair C5 to form a scissor hinge folding rod. Four second scissor hinge connecting rods 10 are provided, and one end of the second scissor hinge connecting rod 10 is connected to the end point of the scissor hinge folding rod through a rotating pair C6, and the other end of the second scissor hinge connecting rod 10 is connected to the second connecting rod through a rotating pair C7. All the rotating pair axes are parallel to each other, and the length of each scissor hinge connecting rod is determined according to the geometric relationship of the folding antenna mechanism being fully unfolded and fully folded.

[0056] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna, characterized in that: It includes N hexahedral folding and spreading units, N is an integer greater than or equal to three, the N hexahedral folding and spreading units are interconnected and distributed in a circumferential array, the side projection surface of the hexahedral folding and spreading unit is trapezoidal, and each hexahedral folding and spreading unit includes a first upper faceplate, a second upper faceplate, a first lower faceplate group, a second lower faceplate group and a shear hinge support unit. The first lower flower disc group, the first upper flower disc, the second upper flower disc and the second lower flower disc group are sequentially connected to form a hexahedral folding and unfolding unit; the first upper flower disc and the second upper flower disc are parallel to each other and their projections overlap, and the first lower flower disc group and the second lower flower disc group are parallel to each other and their projections overlap; The first lower flower disc group and the second lower flower disc group are arranged in a trapezoid on the projection surface, the first upper flower disc is located on a line connecting the center of the trapezoidal circumscribed circle of the first lower flower disc group to the center of the projection surface of the third lower flower disc and the fourth lower flower disc of the first lower flower disc group, and the second upper flower disc is located on a line connecting the center of the trapezoidal circumscribed circle of the second lower flower disc group to the center of the projection surface of the third lower flower disc and the fourth lower disc of the second lower flower disc group; The first lower flower disc group and the second lower flower disc group both include four lower flower discs, and the lower flower discs at corresponding positions have the same structure, and the four lower flower discs are respectively a first lower flower disc, a second lower flower disc, a third lower flower disc and a fourth lower flower disc; the first upper flower disc and the four lower flower discs of the first lower flower disc group and the second upper flower disc and the four lower flower discs of the second lower flower disc group are respectively connected by means of a web, and the two ends of the web are respectively rotatably connected to the upper flower disc or the lower flower disc by means of a rotating pair; The first lower flower disc and the second lower flower disc, the second lower flower disc and the third lower flower disc, and the first lower flower disc and the fourth lower flower disc of the two lower flower disc groups are respectively connected by means of a group of rotating folding rods, each group of rotating folding rods includes two rotating rods connected together by means of a rotating pair, and the ends of the rotating rods connected to the lower flower discs are respectively rotatably connected to the lower flower discs by means of the rotating pair; The first lower flower disc of the first lower flower disc group and the first lower flower disc of the second lower flower disc group are respectively fixedly connected by means of a first connecting rod, and the third lower flower disc and the fourth lower flower disc of the first lower flower disc group and the third lower flower disc and the fourth lower flower disc of the second lower flower disc group are respectively fixedly connected to the shear hinge support unit by means of a second connecting rod; The two rotational pairs of each web member are parallel to each other, and the three rotational pairs of each set of rotating folding rods are parallel to each other; Two adjacent hexahedral folding units share the first and second lower flower discs of the first and second lower flower disc groups, and the third and fourth lower flower discs of the first and second lower flower disc groups between the two adjacent hexahedral folding units are connected by means of a group of rotating folding rods.

2. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 1, characterized in that: The outer surface of the upper faceplate is evenly provided with four notches for connecting the belly rod, and the rotation axis of each notch is parallel to the upper and lower bottom surfaces and is located at the center.

3. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 1, characterized in that: The structures of the first lower flower disc and the second lower flower disc are the same and are arranged in mirror symmetry, and both include two layers of slots, the first layer of slots are used to connect the belly rod, and the second layer of slots are used to connect the rotating rod, the angle between the two second layer of slots on the inner sides of the first lower flower disc and the second lower flower disc is 360°*(N-2) / N, and the angles between the remaining slots are determined by the projection of the antenna mechanism.

4. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 1, characterized in that: The third lower faceplate and the fourth lower faceplate have the same structure and are arranged in mirror symmetry, and both include two layers of slots, the first layer of slots is used to connect the web rod, and the second layer of slots is used to connect the rotating rod, and the angle between the slots of the third lower faceplate and the fourth lower faceplate is determined by the projection of the antenna mechanism.

5. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 2, 3 or 4, characterized in that: Each slot is provided with a through hole, and the through hole is used to be connected with a rod inserted into the slot through a rotating pair.

6. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 1, characterized in that: The size of the truss foldable antenna structure can be changed by adjusting the length of the rotating folding rod and the number of hexahedral folding units; the length of each group of rotating folding rods is positively correlated with the length of the projection surface when the foldable antenna is fully unfolded, and changes with the shape of the projection surface.

7. The pyramid shear-hinged unit hybrid array single-degree-of-freedom double-layer peripheral truss foldable antenna according to claim 1, characterized in that: The scissor-hinged support unit includes two first scissor-hinged links and four second scissor-hinged links. The two first scissor-hinged links are connected in the middle by a rotating pair to form a scissor-hinged folding rod. The first end of the second scissor-hinged link is connected to the end point of the scissor-hinged folding rod through a rotating pair, and the second end of the second scissor-hinged link is connected to the second connecting rod through a rotating pair. All the rotating pair axes of the scissor-hinged support unit are parallel to each other. The length of each scissor-hinged link is determined according to the geometric relationship of the folding antenna mechanism being fully unfolded and fully folded.

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