Symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units

Abstract

The present invention provides a symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units, which includes three or more oblique hexagonal prism foldable units, which are interconnected and distributed in a circumferential array, and each oblique hexagonal prism foldable unit includes a first hexagonal pyramid foldable unit, a second hexagonal pyramid foldable unit, and four connecting rods connecting the first hexagonal pyramid foldable unit and the second hexagonal pyramid foldable unit, and the vertices of the first hexagonal pyramid foldable unit and the second hexagonal pyramid foldable unit are arranged relatively. The present invention can change the size of the peripheral truss antenna by changing the number and shape of the basic units. The present invention has a simple structure, all connections are revolute pairs, and it is easy to realize engineering manufacturing. It has a high degree of structural symmetry, good deployment performance, and high reliability. It can be used to construct a support mechanism for the 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 symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units. 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] The peripheral ring truss type space deployable antenna is the most common type of space deployable antenna currently in orbit. It has the characteristics of large folding ratio and light weight. Its diameter can reach 100 meters. As the diameter of the antenna increases, the mass of the antenna will not increase proportionally. The overall mass surface density of the antenna is relatively low. A peripheral ring truss type deployable antenna with a diameter of 12.25 meters was installed on the Thuraya satellite launched into orbit in 2000. Its height and diameter after folding are 3.8 meters and 1.3 meters respectively, and the overall antenna mass is 55kg. The peripheral ring truss type deployable antenna is mainly composed of a deployable ring truss, front and rear cable nets, a metal reflective net and cables. The front and rear cable nets are parabolic in shape under the action of the vertical cable preload. At present, the support mechanism of the peripheral truss antenna mainly uses a scissor-type mechanism, while the folding and unfolding mechanism is less used. Summary of the invention

[0004] In order to solve the shortcomings 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.

[0005] Specifically, the present invention provides a symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units.

[0006] It includes three or more oblique hexagonal prism folding and unfolding units, which are interconnected and arranged in a circumferential array, each oblique hexagonal prism folding and unfolding unit includes a first hexagonal pyramid folding and unfolding unit, a second hexagonal pyramid folding and unfolding unit, and four connecting rods connecting the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit, and the vertices of the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit are arranged oppositely and centrally symmetrically;

[0007] The first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit both include a top structure, a first bottom structure, a second bottom structure, a third bottom structure, a fourth bottom structure, a fifth bottom structure, a sixth bottom structure, six webs and twelve rotation connecting rods; the first bottom structure, the second bottom structure, the third bottom structure, the fourth bottom structure, the fifth bottom structure and the sixth bottom structure are respectively connected to the top structure by means of a web; the first bottom structure, the second bottom structure, the third bottom structure, the fourth bottom structure, the fifth bottom structure and the sixth bottom structure are respectively connected to each other by means of two rotation connecting rods, and the two rotation connecting rods are rotationally connected by means of a rotation pair; the first bottom structure, the second bottom structure, the fourth bottom structure and the fifth bottom structure of the first hexagonal pyramid are respectively fixedly connected to the first bottom structure, the second bottom structure, the fourth bottom structure and the fifth bottom structure of the first hexagonal pyramid of the second pentagonal pyramid by means of a connecting rod;

[0008] When three or more oblique hexagonal prism folding and unfolding units are interconnected and distributed in a circumferential array, the first bottom structure and the second bottom structure of the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit of each oblique hexagonal prism folding and unfolding unit are located on the inner side, the fourth bottom structure and the fifth bottom structure are located on the outer side, and the third bottom structure and the sixth bottom structure are located on both sides, and the third bottom structure and the sixth bottom structure are respectively shared with the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit of the oblique hexagonal prism folding and unfolding units adjacent to the two sides, and the fourth bottom structure and the fifth bottom structure are respectively connected to the fifth bottom structure or the fourth bottom structure corresponding to the oblique hexagonal prism folding and unfolding units adjacent to the two sides by means of two rotating connecting rods;

[0009] The bottom structures of the two hexagonal pyramid folding units of each oblique hexagonal prism folding unit are parallel to each other but not in the same plane. The oblique hexagonal prism folding units are arranged in a hexagonal shape on the upper and lower projection surfaces and in a parallelogram shape on the side projection surface.

[0010] Each web member is connected to the top structure or the bottom structure by means of a rotating pair, the two rotating pairs of each web member are parallel to each other, each rotating connecting rod is connected to the connected bottom structure by means of a rotating pair, and the three rotating pairs of every two rotating connecting rods are parallel to each other.

[0011] Preferably, the outer surface of the top structure is evenly provided with six notches for connecting the web rods, the rotation axis of each notch is parallel to the upper and lower bottom surfaces and located in the center, and the direction of each notch of the top structure is the extension line direction of the top structure to the six bottom structures.

[0012] Preferably, the first bottom structure and the second bottom structure are identical and mirror-symmetrical, and are both provided with two layers of slots, the first layer of slots being used to connect the web rods, and the second layer of slots being used to connect the rotating connecting rods, the rotation axis of the first layer of slots being parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots being parallel to the upper and lower bottom surfaces and located at the center; the direction of the first layer of slots is the direction of the extension line of the first bottom structure or the second bottom structure to the top structure, and the direction of the second layer of slots is the direction of the extension line of the first bottom structure or the second bottom structure to other adjacent bottom structures.

[0013] Preferably, the third bottom structure and the sixth bottom structure are the same and are both provided with two layers of slots, the first layer of slots are used to connect the web rods, the second layer of slots are used to connect the rotating connecting rods, the rotation axis of the first layer of slots are parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots are parallel to the upper and lower bottom surfaces and located in the center; the direction of the first layer of slots is the direction of the extension line of the third bottom structure or the sixth bottom structure to the top structure, and the direction of the second layer of slots is the direction of the extension line of the third bottom structure or the sixth bottom structure to other adjacent bottom structures.

[0014] Preferably, the fourth bottom structure and the fifth bottom structure are identical and mirror-symmetrical, and are both provided with two layers of slots, the first layer of slots being used to connect the web rods, and the second layer of slots being used to connect the rotating connecting rods, the rotation axis of the first layer of slots being parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots being parallel to the upper and lower bottom surfaces and located at the center; the direction of the first layer of slots is the direction of the extension line of the fourth bottom structure or the fifth bottom structure toward the top structure, and the direction of the second layer of slots is the direction of the extension line of the fourth bottom structure or the fifth bottom structure toward other adjacent bottom structures.

[0015] Preferably, each notch is provided with a through hole, and the through hole is used to be connected to a rod connector inserted into the notch via a rotation pair.

[0016] Preferably, the size of the truss foldable antenna structure can be changed by adjusting the length of the rotating rod and the number of oblique hexagonal prisms; the length of each group of rotating 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.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention is an oblique hexagonal prism folding unit formed by top-to-top combination of two hexagonal pyramid folding units, which has the advantages of high rigidity, good mechanical properties, and high folding ratio. In addition, the hexagonal prism has high reliability, can form a support mechanism of any curved surface as needed, and can be adjusted at any time as needed, and its overall support rigidity is very high, which can meet various needs.

[0019] (2) The present invention is a basic expandable unit in a single-degree-of-freedom space, that is, only one drive is needed to realize the expansion and folding movement of multiple units, which is easy to operate, has good expansion performance and high reliability.

[0020] (3) The structure of the present invention is simple, and the moving pairs are all rotating pairs, which is easy to implement in engineering manufacturing.

[0021] (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

[0022] Figure 1 It is a schematic three-dimensional diagram of the fully unfolded state of the symmetrical double-layer peripheral truss foldable antenna mechanism based on the oblique hexagonal prism unit of the present invention;

[0023] Figure 2 yes Figure 1 A schematic front view of the fully deployed state;

[0024] Figure 3 yes Figure 1 A schematic diagram of the projection in the fully expanded state;

[0025] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the conventional unfolded state;

[0026] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the fully folded state;

[0027] Figure 6 It is a schematic three-dimensional diagram of the fully unfolded state of the single-degree-of-freedom multi-closed-loop oblique hexagonal prism folding and unfolding basic unit of the present invention;

[0028] Figure 7 yes Figure 5 Side view of the fully deployed state;

[0029] Figure 8 yes Figure 5 A three-dimensional schematic diagram of the conventional unfolded state;

[0030] Fig. 9 yes Figure 5 A three-dimensional schematic diagram of the fully folded state;

[0031] Fig.10 It is a three-dimensional schematic diagram of the top structure of the present invention;

[0032] Fig.11 is a schematic three-dimensional diagram of the first bottom structure of the present invention;

[0033] Fig.12is a schematic three-dimensional diagram of the third bottom structure of the present invention;

[0034] Fig.13 is a schematic three-dimensional diagram of a fifth bottom structure of the present invention;

[0035] Fig.14 is a schematic three-dimensional diagram of the seventh bottom structure of the present invention;

[0036] Fig.15 is a schematic three-dimensional diagram of the ninth bottom structure of the present invention;

[0037] Fig.16 It is a schematic three-dimensional diagram of the tenth bottom structure of the present invention.

[0038] In the figure: A-oblique hexagonal prism folding and unfolding unit, C1-C4: rotation pair, 1-rotation connecting rod, 2-rotation connecting rod, 3-first bottom structure, 4-rotation connecting rod, 5-fifth bottom structure, 6-rotation connecting rod, 7-rotation connecting rod, 8-third bottom structure, 9-connecting rod, 10-ninth bottom structure, 11-abdomen, 12-top structure, 13-eleventh bottom structure, 14-seventh bottom structure;

[0039] A first hexagonal pyramid folding and unfolding unit 101; a second hexagonal pyramid folding and unfolding unit 102. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0041] 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.

[0042] 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.

[0043] Specifically, the present invention provides a symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units, such as Figures 1 to 5As shown, it includes three or more oblique hexagonal prism folding units A, which are interconnected and distributed in a circumferential array. Each oblique hexagonal prism folding unit A includes a first hexagonal pyramid folding unit 101, a second hexagonal pyramid folding unit 102, and four connecting rods 9 connecting the first hexagonal pyramid folding unit 101 and the second hexagonal pyramid folding unit 102. The vertices of the first hexagonal pyramid folding unit 101 and the second hexagonal pyramid folding unit 102 are relatively arranged and centrally symmetrical but not on the same vertical line, so that the side projection of each oblique hexagonal prism unit is a parallelogram on the side.

[0044] like Figures 6 to 9 As shown, the first hexagonal pyramid folding and unfolding unit 101 and the second hexagonal pyramid folding and unfolding unit 102 both include a top structure 12, a first bottom structure 3, a second bottom structure, a third bottom structure 8, a fourth bottom structure, a fifth bottom structure 5, a sixth bottom structure, six webs 11 and twelve rotating connecting rods (the figure shows the rotating connecting rod 4, the rotating connecting rod 6 and the rotating connecting rod 7 of the first hexagonal pyramid folding and unfolding unit 101), the first bottom structure 3, the second bottom structure, the third bottom structure 8, the fourth bottom structure, the fifth bottom structure 5 and the sixth bottom structure are respectively connected to the top structure 12 by means of a web 11, the first bottom structure 3, the second bottom structure, the third bottom structure 8, the fourth bottom structure, the fifth bottom structure 5 and the sixth bottom structure are respectively connected to each other by means of two rotating connecting rods, and the two rotating connecting rods are rotatably connected to form a group of foldable folding connecting rods; a rotating pair C2 is formed between the two rotating connecting rods 4, and a rotating pair C1 is formed between the rotating connecting rod and the bottom structure. The first bottom structure 3, the second bottom structure, the fourth bottom structure and the fifth bottom structure 5 of the first hexagonal pyramid are respectively fixedly connected to the first bottom structure 3, the second bottom structure, the fourth bottom structure and the fifth bottom structure 5 of the first hexagonal pyramid of the second pentagonal pyramid by means of a connecting rod 9.

[0045] When three or more oblique hexagonal prism folding units are interconnected and distributed in a circumferential array, the first bottom structure 3 and the second bottom structure of the first hexagonal pyramid folding unit 101 and the second hexagonal pyramid folding unit 102 of each oblique hexagonal prism folding unit are located on the inner side, the fourth bottom structure and the fifth bottom structure 5 are located on the outer side, the third bottom structure 8 and the sixth bottom structure are located on both sides, and the third bottom structure 8 and the sixth bottom structure are respectively shared with the first hexagonal pyramid folding unit 101 and the second hexagonal pyramid folding unit 102 of the oblique hexagonal prism folding units adjacent to the two sides, and the fourth bottom structure and the fifth bottom structure 5 are respectively connected to the fifth bottom structure 5 or the fourth bottom structure corresponding to the oblique hexagonal prism folding units adjacent to the two sides by means of two rotating connecting rods. Figure 1 The rotating connecting rod 1 and the rotating connecting rod 2 shown in the figure are connected to each other and form a rotating pair.

[0046] The bottom structures of the two hexagonal pyramid folding and unfolding units of each oblique hexagonal prism folding and unfolding unit are parallel to each other but are not in the same plane, and the oblique hexagonal prism folding and unfolding units are arranged in a hexagon on the projection plane.

[0047] Each web member 11 is connected to the top structure 12 or the bottom structure by means of a revolute pair, and the two revolute pairs are revolute pair C3 and revolute pair C4. The two revolute pairs of each web member 11 are parallel to each other, and each rotating connecting rod is connected to the bottom structure by means of a revolute pair, and the three revolute pairs of every two rotating connecting rods are parallel to each other. Specific embodiments

[0049] exist Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The three-dimensional schematic diagram of the symmetrical double-layer perimeter truss foldable antenna mechanism based on the oblique hexagonal prism unit shown includes N=20 single-degree-of-freedom multi-closed-loop oblique hexagonal prism foldable basic units, wherein the first bottom structure 3 and the second bottom structure are on the inner side, the third bottom structure 8 and the sixth bottom structure are on both sides, and the fourth bottom structure and the fifth bottom structure 5 are on the outer side. The adjacent oblique hexagonal prism units A are connected to each other by sharing the third bottom structure, the sixth bottom structure, and the corresponding ninth bottom structure and the twelfth bottom structure on the lower side, and the rotating connecting rod 1 and the rotating connecting rod 2 shown in the figure, and this connection is a rotating pair connection. Thus, a foldable antenna mechanism is formed.

[0050] exist Figure 6 , Figure 7 , Figure 8 and Fig. 9 In the schematic diagram of the single-degree-of-freedom multi-closed-loop oblique hexagonal prism folding basic unit shown, it includes twenty-four rotating connecting rods, twelve webs 11, twelve bottom structures, four connecting rods and two top structures 12. An oblique hexagonal prism folding basic unit A can be regarded as two hexagonal pyramid folding units with the same projection, which are placed top to top and centrally symmetrically and then connected by four connecting rods, and the two ends of the connecting rods are respectively fixed to the two bottom structures; in a hexagonal pyramid folding unit, the third bottom structure 8 and the sixth bottom structure are exactly the same, and each bottom structure has two layers of notches, the first layer is connected to the web 11 through a rotating pair, and the second layer is connected to the rotating connecting rod through a rotating pair; the web 11 is exactly the same, and there is a rotating pair at each end; each rotating connecting rod group is connected by two rotating connecting rods by a rotating pair, and each group has a rotating pair at each end; the top structure 12 has a layer of notches, which is connected to the web 11 through a rotating pair. The three rotating pairs of each group of rotating connecting rods are parallel to each other, and the two rotating pairs of each web 11 are parallel. Thus, an oblique hexagonal prism folding basic unit is formed.

[0051] exist Fig.10 In the top structure 12 shown, six slots 121 are provided, the rotation axis of each slot is parallel to the upper and lower bottom surfaces and 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 top structure 12 is determined by the projection of the basic folding unit of the oblique hexagonal prism, and the direction of each slot is the extension line direction of the top structure 12 to the six bottom structures.

[0052] exist Fig.11 In the three-dimensional schematic diagram of the first bottom structure 3 shown, the first bottom structure and the second bottom structure are mirror-symmetrical, so the second bottom structure is not shown. The first bottom structure and the second bottom structure both include two layers of slots, the first layer of slots 31 is used to connect the web rod, and the second layer of slots 32 is used to connect the rotating connecting rod. The first layer of slots 31 is only schematically shown in the figure, the rotation axis of the first layer of slots is parallel to the upper and lower bottom surfaces, 3mm away from the upper bottom surface, the rotation axis of the second layer of slots is parallel to the upper and lower bottom surfaces and located at the center, and each surface of each layer of slots is perpendicular to the upper and lower bottom surfaces; the angle between each slot of the first bottom structure and the second bottom structure is determined by the projection of the folding antenna mechanism, the first bottom structure and the second bottom structure are located at the inner vertices of the projected hexagon, the direction of the first layer of slots is the direction of the extension line of the first bottom structure and the second bottom structure to the top structure 12, and the direction of the second layer of slots is the direction of the extension line of the first bottom structure and the second bottom structure to other bottom structures.

[0053] exist Fig.12 The third bottom structure 8 and the sixth bottom structure are shown in a three-dimensional schematic diagram. The third bottom structure 8 and the sixth bottom structure are exactly the same, and both include two layers of slots. The first layer of slots 81 is used to connect the web rods, and the second layer of slots 82 is used to connect the rotating connecting rods. The first layer of slots 81 is only schematically shown in the figure. The rotation axis of the first layer of slots 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 slots is parallel to the upper and lower bottom surfaces and is located at the center. Each side of each layer of slots is perpendicular to the upper and lower bottom surfaces. The angle between each slot of the third bottom structure and the sixth bottom structure is determined by the projection of the folding antenna mechanism. The third bottom structure and the sixth bottom structure are located at the two side vertices of the projected hexagon. The direction of the first layer of slots is the direction of the extension line of the third bottom structure and the sixth bottom structure to the top structure 12, and the direction of the second layer of slots is the direction of the extension line of the third bottom structure and the sixth bottom structure to other bottom structures.

[0054] exist Fig.13The schematic three-dimensional diagram of the fifth bottom structure shown in the figure shows that the fourth bottom structure and the fifth bottom structure 5 have the same structure and are mirror-symmetrical, and both include two layers of slots, the first layer of slots 51 is used to connect the web rod, and the second layer of slots 52 is used to connect the rotating connecting rod. The first layer of slots 51 is only schematically shown in the figure, the rotation axis of the first layer of slots is parallel to the upper and lower bottom surfaces, 3mm away from the upper bottom surface, the rotation axis of the second layer of slots is parallel to the upper and lower bottom surfaces and located at the center, and each surface of each layer of slots is perpendicular to the upper and lower bottom surfaces; the angle between each slot of the fourth bottom structure and the fifth bottom structure 5 is determined by the projection of the antenna mechanism, and the fourth bottom structure and the fifth bottom structure 5 are located at the outer vertices of the projected hexagon, the direction of the first layer of slots is the direction of the extension line of the fourth bottom structure and the fifth bottom structure 5 to the top structure 12, and the direction of the second layer of slots is the direction of the extension line of the fourth bottom structure and the fifth bottom structure 5 to other bottom structures.

[0055] Figures 14 to 16 A schematic diagram of several bottom structures of the second hexagonal pyramid folding unit 102 is shown. For the purpose of distinction, the six bottom structures of the second hexagonal pyramid folding unit 102 are referred to as the seventh bottom structure to the twelfth bottom structure, which correspond one-to-one to the six bottom structures of the first hexagonal pyramid folding unit 101, respectively.

[0056] exist Fig.14 As shown in the simplified three-dimensional schematic diagram of the seventh bottom structure, the seventh bottom structure 14 and the eighth bottom structure are mirror-symmetrical, and are both provided with two layers of slots, which are respectively connected to the web rods and the rotating connecting rods, the rotation axis of the first layer of slots is parallel to the upper and lower bottom surfaces, and is 3 mm away from the upper bottom surface, the rotation axis of the second layer of slots is parallel to the upper and lower bottom surfaces and is located at the center, and each side of each layer of slots is perpendicular to the upper and lower bottom surfaces; the angles between the slots of the seventh and eighth bottom structures are determined by the projection of the folded antenna mechanism, the seventh and eighth bottom structures are located at the inner vertices of the projected hexagon, the direction of the first layer of slots is the direction of the extension lines of the seventh and eighth bottom structures to the top structure 12, and the direction of the second layer of slots is the direction of the extension lines of the seventh and eighth bottom structures to other bottom structures.

[0057] exist Fig.15The third perspective schematic diagram of the ninth bottom structure 10 is shown. The ninth bottom structure is exactly the same as the twelfth bottom structure, so the twelfth bottom structure is not shown. The ninth bottom structure is also provided with two layers of slots, which are connected to the web and the rotation connecting rod respectively. The rotation axis of the first layer of slots 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 slots is parallel to the upper and lower bottom surfaces and is located at the center. Each side of each layer of slots is perpendicular to the upper and lower bottom surfaces. The angles between the slots of the ninth and twelfth bottom structures are determined by the projection of the folding antenna mechanism. The ninth and twelfth bottom structures are located at the vertices of the two sides of the projected hexagon. The direction of the first layer of slots is the direction of the extension line of the ninth and twelfth bottom structures to the top structure 12, and the direction of the second layer of slots is the direction of the extension line of the ninth and twelfth bottom structures to other bottom structures.

[0058] exist Fig.16 The 11th bottom structure 13 is shown in a three-dimensional schematic diagram. The 10th bottom structure and the 11th bottom structure are mirror-symmetrical, so the 10th bottom structure is not shown. The 11th bottom structure is also provided with two layers of slots, which are connected to the web and the rotating connecting rod respectively. The rotation axis of the first layer of slots 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 slots is parallel to the upper and lower bottom surfaces and is located at the center. Each side of each layer of slots is perpendicular to the upper and lower bottom surfaces. The angles between the slots of the 10th and 11th bottom structures are determined by the projection of the folding antenna mechanism. The 10th and 11th bottom structures are located at the inner vertices of the projected hexagon. The direction of the first layer of slots is the direction of the extension line of the 10th and 11th bottom structures to the top structure 12, and the direction of the second layer of slots is the direction of the extension line of the 10th and 11th bottom structures to other bottom structures.

[0059] The present invention is conducive to the top-to-top combination of two hexagonal pyramid folding units into an oblique hexagonal prism folding unit, and then a plurality of oblique hexagonal prism folding units are combined into an antenna mechanism, which has high rigidity, good mechanical properties, and a high folding ratio. In addition, the hexagonal prism has high reliability and can form a support mechanism of any curved surface as needed when used, and can be adjusted at any time as needed, and its overall support rigidity is very high.

[0060] 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 symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units, characterized in that: It includes three or more oblique hexagonal prism folding and unfolding units, which are interconnected and arranged in a circumferential array, each oblique hexagonal prism folding and unfolding unit includes a first hexagonal pyramid folding and unfolding unit, a second hexagonal pyramid folding and unfolding unit, and four connecting rods connecting the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit, and the vertices of the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit are arranged oppositely and centrally symmetrically; The first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit both include a top structure, a first bottom structure, a second bottom structure, a third bottom structure, a fourth bottom structure, a fifth bottom structure, a sixth bottom structure, six webs and twelve rotation connecting rods; the first bottom structure, the second bottom structure, the third bottom structure, the fourth bottom structure, the fifth bottom structure and the sixth bottom structure are respectively connected to the top structure by means of a web; the first bottom structure, the second bottom structure, the third bottom structure, the fourth bottom structure, the fifth bottom structure and the sixth bottom structure are respectively connected to each other by means of two rotation connecting rods, and the two rotation connecting rods are rotationally connected by means of a rotation pair; the first bottom structure, the second bottom structure, the fourth bottom structure and the fifth bottom structure of the first hexagonal pyramid folding and unfolding unit are respectively fixedly connected to the first bottom structure, the second bottom structure, the fourth bottom structure and the fifth bottom structure of the second hexagonal pyramid folding and unfolding unit by means of a connecting rod; When three or more oblique hexagonal prism folding and unfolding units are interconnected and distributed in a circumferential array, the first bottom structure and the second bottom structure of the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit of each oblique hexagonal prism folding and unfolding unit are located on the inner side, the fourth bottom structure and the fifth bottom structure are located on the outer side, and the third bottom structure and the sixth bottom structure are located on both sides, and the third bottom structure and the sixth bottom structure are respectively shared with the first hexagonal pyramid folding and unfolding unit and the second hexagonal pyramid folding and unfolding unit of the oblique hexagonal prism folding and unfolding units adjacent to the two sides, and the fourth bottom structure and the fifth bottom structure are respectively connected to the fifth bottom structure or the fourth bottom structure corresponding to the oblique hexagonal prism folding and unfolding units adjacent to the two sides by means of two rotating connecting rods; The bottom structures of the two hexagonal pyramid folding units of each oblique hexagonal prism folding unit are parallel to each other but not in the same plane. The oblique hexagonal prism folding units are arranged in a hexagonal shape on the upper and lower projection surfaces and in a parallelogram shape on the side projection surface. Each web member is connected to the top structure or the bottom structure by means of a rotation pair, the two rotation pairs of each web member are parallel to each other, each rotation connecting rod is connected to the connected bottom structure by means of a rotation pair, and the three rotation pairs of every two rotation connecting rods are parallel to each other; The outer surface of the top structure is evenly provided with six notches for connecting the web bars, the rotation axis of each notch is parallel to the upper and lower bottom surfaces and is located at the center, and the direction of each notch of the top structure is the direction of the extension line of the top structure to the six bottom structures; The size of the truss foldable antenna structure can be changed by adjusting the length of the rotating rod and the number of oblique hexagonal prisms; the length of each group of rotating 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.

2. The symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units according to claim 1 is characterized in that: The first bottom structure and the second bottom structure are identical and mirror-symmetrical, and are both provided with two layers of slots, the first layer of slots are used to connect the web rods, and the second layer of slots are used to connect the rotating connecting rods, the rotation axis of the first layer of slots is parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots is parallel to the upper and lower bottom surfaces and is located in the center; the direction of the first layer of slots is the direction of the extension line of the first bottom structure or the second bottom structure to the top structure, and the direction of the second layer of slots is the direction of the extension line of the first bottom structure or the second bottom structure to other adjacent bottom structures.

3. The symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units according to claim 1 is characterized in that: The third bottom structure is the same as the sixth bottom structure and is provided with two layers of slots. The first layer of slots is used to connect the web rods, and the second layer of slots is used to connect the rotating connecting rods. The rotation axis of the first layer of slots is parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots is parallel to the upper and lower bottom surfaces and is located in the center; the direction of the first layer of slots is the direction of the extension line of the third bottom structure or the sixth bottom structure to the top structure, and the direction of the second layer of slots is the direction of the extension line of the third bottom structure or the sixth bottom structure to other adjacent bottom structures.

4. The symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units according to claim 1 is characterized in that: The fourth bottom structure and the fifth bottom structure are identical and mirror-symmetrical, and are both provided with two layers of slots, the first layer of slots being used to connect the web rods, and the second layer of slots being used to connect the rotating connecting rods, the rotation axis of the first layer of slots being parallel to the upper and lower bottom surfaces, and the rotation axis of the second layer of slots being parallel to the upper and lower bottom surfaces and being located at the center; the direction of the first layer of slots is the direction of the extension line of the fourth bottom structure or the fifth bottom structure toward the top structure, and the direction of the second layer of slots is the direction of the extension line of the fourth bottom structure or the fifth bottom structure toward other adjacent bottom structures.

5. The symmetrical double-layer peripheral truss foldable antenna mechanism based on oblique hexagonal prism units 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 the rod connector inserted into the slot through a rotation pair.

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