Three-dimensional secondary space film folding storage mechanism

Abstract

The utility model relates to a three -dimensional secondary space film folding storage mechanism, relates to film storage field, including bottom film subassembly, upper film subassembly, W shape deployable rib subassembly and a plurality of telescopic stretchable arms, a plurality of W shape deployable rib subassembly form a layer rib group, set up multilayer rib group, every W shape deployable rib subassembly includes root hinge, inter -bar hinge and four carbon fiber rods, and the carbon fiber rods are sequentially connected through inter -bar hinge between the carbon fiber rods, obtain carbon fiber rod chain, and the both ends of carbon fiber rod chain are connected root hinge, the both ends of upper film subassembly are connected with the carbon fiber rods of adjacent two layers rib group respectively, and bottom film subassembly is connected in bottom layer rib group's carbon fiber rod, and bottom film subassembly is fixed with cabin bottom, and the root hinge of W shape deployable rib subassembly both ends is connected on adjacent two stretchable arms, and the root hinge is rotatably connected with stretchable arm with the axis of stretchable arm as the shaft, can be stored many times, lightweight, and the storage ratio is big.

Description

TECHNICAL FIELD

[0001] The application relates to a three-dimensional secondary space thin film folding storage mechanism, and particularly relates to a three-dimensional secondary space thin film folding storage mechanism which is suitable for an ultra-large and ultra-light deployable thin film structure. BACKGROUND

[0002] With the increasing demand of large aperture (hundreds of square meters or even larger) antennas of spacecraft, the space large thin film deployable structure has become one of the research hotspots of current spacecraft. The traditional spacecraft rigid structure cannot meet the carrying requirements due to the excessively large launch volume and weight, and the deployable thin film structure is highly valued due to the advantages of light weight and large storage ratio.

[0003] ESA designed a global astronomical interferometer (Global Astronomic Interferometer for Astrophysics, GAIA) sunshade, and the structure has been deployed in space in December 2013. The structure is composed of 12 H-shaped carbon fiber-aluminum trusses, and 2 simple seats are designed at the bottom of each truss. A motor provides continuous mechanical torque to stably and synchronously deploy the truss from vertical to horizontal, and form a circular plane with a diameter of 10.3 m. However, the sunshade structure is a single-layer thin film structure, and the thin film structure is deployed once. The James Webb Space Telescope (JWST) adopts a thin film sunshade screen. The JWST sunshade screen is 22 meters long and has 5 layers, and a high polymer thin film material is adopted. The deployment design principle is that two combined brackets are axially rotated to deploy, and two variable-diameter sleeve rods are directionally moved to gradually deploy the multi-layer sunshade thin film. However, the storage ratio is large, and the weight of the thin film storage mechanism is large. SUMMARY

[0004] The application solves the technical problem that the existing thin film storage mechanism is once stored, the storage mechanism is heavy, and the storage ratio is large, and provides a three-dimensional secondary space thin film folding storage mechanism which is three-dimensional, secondary stored, light, and has a large storage ratio, so as to meet the demand of a large spaceborne load on the large, light, and small volume deployable thin film sunshade after folding, and the deployment is stable and reliable.

[0005] The technical scheme provided by the application is as follows:

[0006] The application discloses a three-dimensional secondary space thin film folding storage mechanism, which comprises a thin film assembly, a W-shaped expandable rib assembly and a linear stretching mechanism, n W-shaped expandable rib assemblies form a rib group, n is a positive integer not less than 1, and m layers of rib groups arranged vertically are arranged in total, m is a positive integer; the thin film assembly comprises a bottom thin film assembly and an upper thin film assembly; each W-shaped expandable rib assembly comprises a root hinge, an inter-rod hinge and four carbon fiber rods, the four carbon fiber rods are sequentially connected through three inter-rod hinges to form a carbon fiber rod chain, and both ends of the carbon fiber rod chain are connected with the root hinge; both ends of the upper thin film assembly are connected with carbon fiber rods of adjacent two layers of rib groups respectively, the bottom thin film assembly is connected with the carbon fiber rods of the bottom layer of rib groups, and the bottom thin film assembly is fixed to the bottom of a cabin body; the linear stretching mechanism comprises a plurality of telescopic stretching arms, the root hinges at both ends of each W-shaped expandable rib assembly are connected with adjacent two stretching arms, and the root hinge is rotationally connected with the stretching arm with the axis of the stretching arm as the axis; the root hinge is rotated to drive the W-shaped expandable rib assembly, the stretching arm and the thin film assembly to be circumferentially unfolded; the stretching arm is stretched to drive the distance between the adjacent two layers of rib groups to be larger, and the thin film assembly is longitudinally unfolded.

[0007] If there is another W-shaped expandable rib assembly above one W-shaped expandable rib assembly, the W-shaped expandable rib assembly is located at a lower layer position, and the carbon fiber rods of the W-shaped expandable rib assembly at the lower layer position are detachably connected with ultra-thin aluminum honeycomb plates on both sides.

[0008] Two W-shaped expandable rib assemblies adjacent in the vertical direction are positioned by means of a wedge, that is, the lower edge of the W-shaped expandable rib assembly above and the upper edge of the W-shaped expandable rib assembly below are both inclined surfaces, and the two inclined surfaces are in close contact in the folding state, so as to ensure the synchronism of the unfolding process of the four layers of W-shaped expandable rib assemblies.

[0009] Ropes are used to link all the root hinges and inter-rod hinges in the rib group.

[0010] The bottom thin film assembly is a circumferentially unfoldable sunshade screen, a through hole is arranged in the middle of the circumferentially unfoldable sunshade screen, the edge of the through hole forms an inner edge of the circumferentially unfoldable sunshade screen, the inner edge is fixed on the bottom of the cabin body, and the outer edge is connected with the carbon fiber rods of the bottom layer of rib groups; in order to solve the folding storage problem of the circumferentially unfoldable sunshade screen, the folding state of the circumferentially unfoldable sunshade screen is composed of Miura paper folding units and 'Z' paper folding units, the edge connected with the W-shaped rib assembly is folded by means of the Miura folding, and the edge connected with the stretching arm is folded by means of the 'Z' folding; the folding mode can realize the ordered folding storage of the planar thin film and ensure the coordination between the thin film folding and the mechanism folding.

[0011] The upper film assembly comprises a cylindrical high-thermal-insulation film structure and a bevel-cut wave-penetrating film structure, the m-layer rib group comprises a first layer rib group, a second layer rib group, a third layer rib group and a fourth layer rib group from bottom to top, the cylindrical high-thermal-insulation film structure is in a cylindrical shape, one end of the cylindrical high-thermal-insulation film structure is connected with the carbon fiber rods of the first layer rib group, and the other end is connected with the carbon fiber rods of the second layer rib group; the bevel-cut wave-penetrating film structure is divided into an upper section and a lower section, one end of the lower section is connected with the carbon fiber rods of the second layer rib group, and the other end is connected with the carbon fiber rods of the third layer rib group; one end of the upper section is connected with the carbon fiber rods of the third layer rib group, and the other end is connected with the carbon fiber rods of the fourth layer rib group.

[0012] The cylindrical high-thermal-insulation film structure is folded in a Z shape and is then loaded into the space formed by the carbon fiber rods of the first layer rib group and the super-thin aluminum honeycomb plates on both sides; the upper section and the lower section are both folded in a Z shape, and then the lower section is loaded into the space formed by the carbon fiber rods of the second layer rib group and the super-thin aluminum honeycomb plates on both sides, and the upper section is loaded into the space formed by the carbon fiber rods of the third layer rib group and the super-thin aluminum honeycomb plates on both sides.

[0013] The W-shaped rib assembly is mainly used for being compressed to bear the load of the launch section, and each W-shaped rib assembly has two compression points, and there are totally 12 compression points.

[0014] In summary, the present application has at least the following beneficial technical effects:

[0015] (1) The present application adopts the technical scheme of "block type film assembly+W-shaped deployable rib assembly", which can realize three-dimensional secondary storage and deployment of a super-large space film, solves the problem of three-dimensional secondary storage of the film, and meets the demand for high storage ratio and light weight of a large-area space bevel-cut cylindrical film structure;

[0016] (2) The W-shaped deployable rib assembly adopts a four-layer drawer type structure, which is composed of carbon fiber rods and super-thin aluminum honeycomb structures, and the drawer type structure can be repeatedly disassembled, thereby greatly improving the efficiency of film disassembly and assembly;

[0017] (3) The film is stored in the W-shaped deployable rib assembly, which is first deployed circumferentially to form a hexagon, and then is longitudinally deployed under the driving of the deployment arm, so as to realize three-dimensional secondary deployment of the film structure;

[0018] (4) The circumferential deployable sunshade screen is based on Miura folding units and Z-shaped folding units, a Miura folding unit with a large-angle top corner is designed by comprehensively considering driving elements, inner constraint frames and outer constraint frames;

[0019] (5) In the present application, the layers of the multi-layer rib group are positioned by wedges, and the hinges in each single-layer W-shaped rib are connected by a rope linkage, which ensures the orderliness of the rib assembly during deployment BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the unfolded state of the space film folding storage mechanism of the present application;

[0021] Figure 2 It is a schematic diagram of the folded state of the high-space film folding storage mechanism of the present application;

[0022] Figure 3 It is a schematic diagram of the folded state of the W-shaped deployable rib assembly of the present application;

[0023] Figure 4 It is a schematic diagram of the connection between the film assembly and the rib assembly of the present application;

[0024] Figure 5 It is a schematic diagram of a layer of W-shaped deployable rib assembly of the present application;

[0025] Figure 6 It is a schematic diagram of the Miura folding and Z-shaped folding state of the circumferential deployable sunshade screen of the present application;

[0026] Figure 7 It is a schematic diagram of the Miura and Z-shaped folding creases of the circumferential deployable sunshade screen of the present application;

[0027] Figure 8 It is a schematic diagram of the wedge positioning between the multi-layer rib groups of the present application;

[0028] Figure 9 It is a schematic diagram of the rope linkage of the W-shaped deployable rib assembly of the present application;

[0029] Figure 10 It is a schematic diagram of the compacting and releasing device of the present application.

[0030] 1, circumferential deployable sunshade screen; 2, cylindrical high-thermal-insulation film structure; 3, obliquely cut wave-penetrating film structure; 4, W-shaped deployable rib assembly; 5, straight-line stretching mechanism; 7, compacting and releasing device;

[0031] 8, first layer rib group; 9, second layer rib group; 10, third layer rib group; 11, fourth layer rib group; 12, root hinge; 13, inter-rod hinge; 14, detachable storage carbon fiber frame; 15, compacting rope. DETAILED DESCRIPTION

[0032] To make the objects, technical solutions and advantages of the present application clearer, the disclosed embodiments will be further described in detail below with reference to the drawings.

[0033] The embodiments of the present application disclose a three-dimensional secondary space film folding storage mechanism, as shown in Figure 1 and Figure 2 , the unfolded film is a bevelled six-prism, which comprises a film assembly, a W-shaped deployable rib assembly 4, a straight stretching mechanism 5 and a compression release device 7.

[0034] As shown in Figure 10 , each W-shaped deployable rib assembly 4 has two compression release devices 7, and there are totally 12 compression release devices 7. In the launch section, the compression release device 7 applies a pre-tightening force to the W-shaped deployable rib assembly 4 through a compression cable 15, both ends of the compression cable 15 are connected to the top and bottom W-shaped deployable rib assemblies among the plurality of W-shaped deployable rib assemblies arranged along the axial direction, and after reaching the predetermined orbit, the compression cable 15 is cut off under the unlocking instruction, thereby achieving the unlocking and releasing of the compression release device 7.

[0035] The plurality of W-shaped deployable rib assemblies 4 form a layer, and there are totally four layers, each layer is used for the storage of the folded film assembly, the four layers of W-shaped deployable rib assemblies 4 from bottom to top are respectively a first layer rib group 8, a second layer rib group 9, a third layer rib group 10 and a fourth layer rib group 11, the first layer rib group 8 and the second layer rib group 9 each comprise six W-shaped deployable rib assemblies 4, the third layer rib group 10 comprises three W-shaped deployable rib assemblies 4, and the fourth layer rib group 11 comprises one W-shaped deployable rib assembly 4, the fourth layer rib group 11 is located directly above the W-shaped deployable rib assembly 4 in the middle of the third layer rib group 10.

[0036] As shown in Figure 5As shown, it is a schematic diagram of one (and one layer) W-shaped deployable rib assembly 4, which includes 2 root hinges 12, 3 inter-rod hinges 13 and 4 detachable carbon fiber frame 14. Each detachable carbon fiber frame 14 includes carbon fiber rods and optional ultra-thin aluminum honeycomb panels, and the two sides of the carbon fiber rods are respectively detachably connected with the ultra-thin aluminum honeycomb panels. The space above the carbon fiber rods and the two ultra-thin aluminum honeycomb panels forms a space for placing the film assembly. Specifically, the carbon fiber rods of the W-shaped deployable rib assembly 4 at the top layer position are not installed with ultra-thin aluminum honeycomb panels, and the carbon fiber rods of the other W-shaped deployable rib assemblies 4 are detachably installed with ultra-thin aluminum honeycomb panels on both sides. The carbon fiber rods are threaded inserts, and the ultra-thin aluminum honeycomb panels are through-hole inserts. When they are connected, they are connected by screws. When disassembled, the ultra-thin aluminum honeycomb panels can be directly disassembled by removing the screws. The meaning of the top layer position is that when there is no other W-shaped deployable rib assembly 4 above the W-shaped deployable rib assembly 4, the W-shaped deployable rib assembly 4 is at the top layer position. When it is necessary to install the film assembly, the outer ultra-thin aluminum honeycomb panel is disassembled, and after the film assembly is installed, the ultra-thin aluminum honeycomb panel is reinstalled. The film assembly is installed between the two adjacent W-shaped deployable rib assemblies 4, and the two ends of the film assembly are respectively connected with the carbon fiber rods of the upper W-shaped deployable rib assembly 4 and the carbon fiber rods of the lower W-shaped deployable rib assembly 4.

[0037] As shown, Figure 5 Each W-shaped deployable rib assembly 4 includes 4 carbon fiber rods, which are sequentially connected by inter-rod hinges 13. The two ends of the 4 carbon fiber rods are connected with the root hinges, and the W-shaped deployable rib assembly 4 is folded into a W shape. When unfolded, it is driven by 5 hinges, and the unfolding process is from W-shaped to one shape. The hinges are connected by a rope linkage to ensure the orderliness of the W-shaped W-shaped deployable rib assembly during unfolding. The film assembly of each layer is folded and stored in the detachable carbon fiber frame 14, and is unfolded with the unfolding of the W-shaped deployable rib assembly 4.

[0038] The straight stretching mechanism 5 includes 6 length-adjustable stretching arms arranged in a hexagonal shape. The root hinges 12 at both ends of each W-shaped deployable rib assembly 4 are connected to the adjacent two stretching arms, and the W-shaped opening side of the 6 W-shaped deployable rib assemblies 4 faces outward. The root hinge 12 and the stretching arm are connected with the axis of the stretching arm as the axis. When unfolding is needed, the root hinge 12 rotates to drive the film assembly to unfold circumferentially. Then, the length of the stretching arm is increased, so that the distance between the two adjacent W-shaped deployable rib assemblies 4 is increased, and the film assembly between the two adjacent W-shaped deployable rib assemblies 4 is opened.

[0039] As shown, Figure 3The diagram shows a four-layer W-shaped deployable rib assembly 4. The carbon fiber rods of the first rib assembly 8, the second rib assembly 9, and the third rib assembly 10 are fitted with ultra-thin aluminum honeycomb panels on both sides. The carbon fiber rods of the fourth rib assembly 11 are not fitted with ultra-thin aluminum honeycomb panels on both sides.

[0040] like Figure 1 As shown, the thin film assembly includes a circumferentially deployable sunshade 1, a cylindrical high-heat-insulating thin film structure 2, and a slanted wave-transparent thin film structure 3.

[0041] The circumferentially deployable sunshade 1 is hexagonal in shape, with a hexagonal through-hole in the center. The edge of the through-hole forms the inner edge of the circumferentially deployable sunshade 1. The inner edge is fixed to the bottom of the cabin, and the outer edge is fixed to the bottom edge of the carbon fiber rod of the first layer of ribs 8. Figure 6 This is a schematic diagram of the folded state of the circumferentially expandable sunshade 1, which consists of Miura origami units and "Z" shaped origami units. The side connected to the W-shaped rib assembly adopts Miura folding, and the side connected to the extension arm adopts "Z" shaped folding. This folding method can not only achieve orderly folding and storage of the planar film, but also ensure the coordination between film folding and mechanism folding. Figure 7 This is a schematic diagram of the fold design of the circumferentially expandable sunshade 1.

[0042] The circumferentially expandable sunshade 1 is located on the bottom surface of a beveled hexagonal prism. When folded, it is stored in the first layer of the W-shaped expandable rib assembly. When unfolded, it expands through the unfolding of the W-shaped expandable rib assembly, forming a hexagonal planar annular membrane structure under the action of the membrane tensioning system. The folding design of the circumferentially expandable sunshade has many constraints, and the crease design is a challenge. Based on the Miura origami unit and the "Z"-shaped origami unit, and considering the driving element, inner constraint frame, and outer constraint frame, a Miura origami unit with a large apex angle is designed to reduce the spacing between units after folding. A "Z"-shaped origami unit is designed at the apex of the hexagonal outer contour. The creases of the two origami units are allowed to extend and intersect naturally, forming the final crease design.

[0043] The cylindrical high-insulation film structure 2 is cylindrical in shape. One end of the cylindrical high-insulation film structure 2 is connected to the carbon fiber rod of the first layer rib group 8, and the other end is connected to the carbon fiber rod of the second layer rib group 9. The cylindrical high-insulation film structure 2 is folded and stored in a "Z" shape. After folding and then rotating 90°, it is stored in a hexagonal shape and then inserted into the space formed by the carbon fiber rod of the first layer rib group 8 and the ultra-thin aluminum honeycomb panels on both sides. It then undergoes a second folding with the W-shaped deployable rib assembly 4. The cross-sectional structure of the cylindrical high-insulation film structure 2 after being inserted into the W-shaped deployable rib assembly 4 is shown below. Figure 4 As shown.

[0044] The obliquely cut, wave-transparent thin-film structure 3 adopts a segmented design, consisting of an upper section and a lower section. One end of the lower section is connected to the carbon fiber rod of the second rib group 9, and the other end is connected to the carbon fiber rod of the third rib group 10. One end of the upper section is connected to the carbon fiber rod of the third rib group 10, and the other end is connected to the carbon fiber rod of the fourth rib group 11. Both the upper and lower sections are folded in a "Z" shape for storage. After folding and then rotating 90°, they are stored in a hexagonal shape. A W-shaped deployable rib assembly 4 is then inserted, and a second fold is performed along with the W-shaped deployable rib assembly 4. The cross-sectional structures of both the upper and lower sections after inserting the W-shaped deployable rib assembly 4 are as follows... Figure 4 As shown. The unfolded shape of the obliquely cut translucent thin film structure is an obliquely cut cylindrical structure, located on the edge of the obliquely cut hexagonal prism. After the film is folded up, it is stored in the second, third, and fourth layers of the W-shaped unfoldable rib assembly.

[0045] This invention adopts a technical solution of "segmented thin film assembly + W-shaped expandable rib assembly + thin film tensioning system", which can realize three-dimensional secondary storage and expansion of ultra-large space thin film, solve the current problem of three-dimensional secondary storage of thin film, and meet the high storage ratio requirement of ultra-large area three-dimensional thin film structure.

[0046] The W-shaped deployable rib assembly of the present invention adopts a four-layer drawer-type structure, which is composed of carbon fiber rods and ultra-thin aluminum honeycomb structure. The drawer-type structure can be repeatedly disassembled, which greatly improves the efficiency of repeated disassembly and assembly of the film.

[0047] The circumferentially deployable sunshade of the present invention is based on the Miura origami unit and the "Z" shaped origami unit. The Miura origami unit with a large apex angle is designed to adapt to the configuration of the driving element, the inner constraint frame and the outer constraint frame.

[0048] The film components in this invention are all housed in a closed W-shaped expandable rib assembly, which greatly saves storage space for the film components. Moreover, the film is pulled out during the unfolding process, which can effectively avoid the risk of snagging with the mechanism.

[0049] In this invention, the layers of the multi-layered rib assembly are positioned using a wedge shape, such as... Figure 8 As shown, the upper W-shaped retractable rib assembly has first inclined surfaces on its lower inner and outer sides, which gradually converge towards the lower W-shaped retractable rib assembly. The lower W-shaped retractable rib assembly has second inclined surfaces on its upper inner and outer sides, which gradually recede towards the upper W-shaped retractable rib assembly. In the retracted state, the first and second inclined surfaces fit together, and the hinges in each single-layer W-shaped rib are linked by a rope linkage design. Figure 9 As shown, wedge positioning and rope linkage ensure the orderly deployment of the rib assembly.

[0050] The content that is not described in detail in the specification of the present application is the known technology of those skilled in the art.

[0051] The above detailed description of the present application is made in conjunction with specific embodiments and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that the technical solutions and embodiments of the present application can be variously replaced, modified or improved without deviating from the spirit and scope of the present application, and these all fall within the scope of the present application. The protection scope of the present application is subject to the appended claims.

Claims

1. A three-dimensional secondary space thin film folding storage mechanism, characterized in that: The thin film assembly, W-shaped expandable rib assembly (4) and linear stretching mechanism (5) are included, n W-shaped expandable rib assemblies (4) form a rib group, n is a positive integer not less than 1, m layers of rib groups are arranged in sequence, m is a positive integer; the thin film assembly includes a bottom thin film assembly and an upper thin film assembly; Each W-shaped expandable rib assembly (4) includes a root hinge (12), an inter-rod hinge (13) and four carbon fiber rods, the four carbon fiber rods are sequentially connected by three inter-rod hinges (13) to form a carbon fiber rod chain, and both ends of the carbon fiber rod chain are connected with the root hinge (12); The two ends of the upper thin film assembly are connected with the carbon fiber rods of the adjacent two layers of rib groups, the bottom thin film assembly is connected with the carbon fiber rods of the bottom layer of rib groups, and the bottom thin film assembly is fixed on the bottom of the cabin body; The linear stretching mechanism (5) includes a plurality of telescopic stretching arms, the root hinges (12) at both ends of each W-shaped expandable rib assembly (4) are connected to the adjacent two stretching arms, and the root hinges (12) are rotationally connected with the stretching arms with the axis of the stretching arms as the axis; the root hinges (12) are rotated to drive the W-shaped expandable rib assembly (4), the stretching arms and the thin film assembly to be circumferentially expanded; the stretching arms are stretched to drive the distance between the adjacent two layers of rib groups to be larger, and the thin film assembly is longitudinally expanded; The adjacent two W-shaped expandable rib assemblies (4) in the vertical direction are positioned by means of wedge, that is, the inner side and the outer side of the lower edge of the upper W-shaped expandable rib assembly are provided with first inclined surfaces, the first inclined surfaces of the inner side and the outer side gradually approach along the direction close to the lower W-shaped expandable rib assembly; the inner side and the outer side of the upper edge of the lower W-shaped expandable rib assembly are provided with second inclined surfaces, the second inclined surfaces of the inner side and the outer side gradually move away along the direction close to the upper W-shaped expandable rib assembly; the first inclined surfaces and the second inclined surfaces are in contact in the folded state.

2. The three-dimensional secondary space film folding and storing mechanism according to claim 1, characterized in that: If there is another W-shaped expandable rib assembly (4) above one W-shaped expandable rib assembly (4), the W-shaped expandable rib assembly (4) is located at a lower layer position, and the two sides of the carbon fiber rods of the W-shaped expandable rib assembly (4) at the lower layer position are detachably connected with ultra-thin aluminum honeycomb panels.

3. The three-dimensional secondary space film folding and storing mechanism according to claim 1, characterized in that: Ropes are used to link all the root hinges (12) and inter-rod hinges (13) in the rib group.

4. The three-dimensional secondary space film folding and storing mechanism according to claim 1, characterized in that: The bottom thin film assembly is a circumferentially expandable sunshade screen (1), a through hole is arranged in the middle of the circumferentially expandable sunshade screen (1), the edge of the through hole forms the inner edge of the circumferentially expandable sunshade screen (1), the inner edge is fixed on the bottom of the cabin body, and the outer edge is connected with the inner side of the carbon fiber rods of the bottom W-shaped expandable rib assembly (4); the folded state of the circumferentially expandable sunshade screen (1) is composed of Miura folding units and "Z" shaped folding units, the part of the circumferentially expandable sunshade screen (1) between the two carbon fiber rods in the middle of the W-shaped expandable rib assembly (4) is folded by Miura, and the part of the circumferentially expandable sunshade screen (1) between the adjacent W-shaped expandable rib assemblies (4) is folded by "Z".

5. The three-dimensional secondary space film folding and storing mechanism according to claim 1, characterized in that: The upper film assembly comprises a cylindrical high-thermal-insulation film structure (2) and a bevel-shaped wave-penetrating film structure (3), and the m-layer rib groups are sequentially arranged from bottom to top as a first layer rib group (8), a second layer rib group (9), a third layer rib group (10) and a fourth layer rib group (11); the cylindrical high-thermal-insulation film structure (2) is in a cylindrical shape, one end of the cylindrical high-thermal-insulation film structure (2) is connected with the carbon fiber rods of the first layer rib group (8), and the other end is connected with the carbon fiber rods of the second layer rib group (9); the bevel-shaped wave-penetrating film structure (3) is divided into an upper section and a lower section, one end of the lower section is connected with the carbon fiber rods of the second layer rib group (9), and the other end is connected with the carbon fiber rods of the third layer rib group (10), one end of the upper section is connected with the carbon fiber rods of the third layer rib group (10), and the other end is connected with the carbon fiber rods of the fourth layer rib group (11).

6. The three-dimensional secondary space film folding and storing mechanism according to claim 5, characterized in that: The cylindrical high-thermal-insulation film structure (2) is folded in a "Z" shape and then is arranged in the space formed by the carbon fiber rods of the first layer rib group (8) and the super-thin aluminum honeycomb plates on both sides; the upper section and the lower section are both folded in a "Z" shape, then the lower section is arranged in the space formed by the carbon fiber rods of the second layer rib group (9) and the super-thin aluminum honeycomb plates on both sides, and the upper section is arranged in the space formed by the carbon fiber rods of the third layer rib group (10) and the super-thin aluminum honeycomb plates on both sides.

7. The three-dimensional secondary space film folding and storing mechanism according to claim 1, characterized in that: The compacting and releasing device (7) is arranged to compact the W-shaped expandable rib assembly (4) in the launching section to bear the load of the launching section, and to release the compacting of the W-shaped expandable rib assembly (4) after reaching the predetermined orbit.

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