Space-based ultra-large-size three-dimensional multi-unfolding film light shield

Abstract

A space-based ultra-large three-dimensional multi-unfolding thin film light shield, the circumferential unfolding mechanism bottom surface is connected with the bottom plate of the light shield cabin, the contained sleeve end is connected with the longitudinal stretching arm assembly and the cabin wall of the light shield cabin at the same time, each set of sleeve is connected with a group of longitudinal stretching arm assemblies. The sleeve and the cabin wall connection is a controllable unlocking compression assembly. A group of rib assemblies are connected between the two groups of longitudinal stretching arm assemblies through flanges. The longitudinal stretching arm assembly and the cabin wall of the light shield cabin, the rib assembly and the bottom plate of the light shield cabin are connected through compression assemblies respectively, which can be unlocked according to signals. The longitudinal stretching arm assembly is divided into three kinds, each with two groups. The rib assembly is divided into four kinds, a total of 16 groups. The two-layer rib and the three-layer rib have cavities inside. In addition to the internal cavity, the one-layer rib also has a bottom cavity. The circumferential unfoldable film can be folded into the bottom cavity of the one-layer rib assembly. The hexagonal prism film can be folded into the one-layer cavity of the rib assembly. The oblique cutting hexagonal prism film can be folded into the two-layer and three-layer cavities of the rib assembly.

Description

Technical Field

[0001] This invention relates to a space-based ultra-large three-dimensional retractable thin-film light shield, particularly a retractable thin-film light shield structure suitable for ultra-large scale, lightweight, and large storage ratio, mainly used for light shielding and heat insulation. Background Technology

[0002] With the continuous development of space exploration activities, the demand for ultra-large aperture cameras in future space missions is increasing. Traditional light shields are generally rigid structures made of carbon fiber honeycomb panels, which no longer meet the requirements of launch due to their excessive launch volume, weight, and insufficient rigidity. Deployable thin-film light shields, on the other hand, have advantages such as being lightweight and having a high collapsibility ratio. Chinese patent CN201911209046.3, "A Side Light Shield Deployment System for an Optical Imaging Satellite," can deploy a cylindrical light-shielding film simultaneously in the axial and radial directions. The light shield has six folding rods at the bottom, each rod consisting of an upper and lower section. At the center of the top of the light shield is a series of telescopic collars. One end of the light-shielding film is connected to the upper section of the folding rod at the bottom, and the other end is connected to the support rod at the top. After the satellite enters orbit, the upper and lower sections of the folding rods at the bottom of the light shield unfold from a folded state to a straight state under the drive of a motor. The ends of the six rods after unfolding form a regular hexagon. The top of the light-shielding cover extends longitudinally by a telescopic collar driven by a lead screw and guide rail. When the lead screw and guide rail reach a preset position, the support arm pushes the support rod to rotate, thus unfolding the top of the light-shielding cover. The fully unfolded light-shielding film is a hexagonal prism. While the unfolded area of ​​this light-shielding cover is large, the entire mechanism contains multiple sets of different motors, and the unfolding process requires these motors to move in a specified sequence and speed. The mechanism is complex and has relatively low reliability. After unfolding, the telescopic collar is located inside the light-shielding cover, which blocks the light path. Chinese patent CN202011057876.1, "A Deployable Film Light-Shielding Cover," adopts a "multi-layer film + integral deployable frame" design. The deployable frame contains two layers and a total of four connecting rod frames that can be unfolded by energy storage springs. After the clamping release device is unlocked, the deployable frame unfolds under the action of the energy storage springs. The rope linkage between the frames ensures synchronous unfolding, causing the multi-layer film to unfold into a diagonally cut hexagonal prism structure. This design boasts advantages such as light weight and high storage ratio. However, as the size increases further, the modular configuration requires additional rod units. The deployment process of multiple rod units driven by energy storage springs becomes increasingly complex, making the interaction between the rope linkage and the energy storage spring drive difficult to analyze. On one hand, the motion trajectory of the rod units is unpredictable, increasing the risk of snagging between the deployment mechanism and the membrane. On the other hand, under the interaction of multiple rods with rope linkage and energy storage springs, the driving force on the membrane at the ends is relatively small, posing a risk that the sunshade may not deploy to its full extent. Therefore, this design exhibits low reliability with increasing scale and cannot be applied to ultra-large sunshades.

[0003] To address the aforementioned issues, and particularly to meet the requirements of spaceborne payloads for ultra-large, high-retractability deployable thin-film light shields, this invention proposes a three-dimensional, multi-deployable thin-film light shield with a simple configuration, lightweight design, high retractability, and high rigidity. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and solve the problems that the traditional light shield's launch volume and mass cannot meet the carrying requirements, or that the deployment mechanism is complex, the rigidity after deployment is low, and the folded volume is large.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A space-based ultra-large three-dimensional retractable thin film light shield mainly consists of a light shield chamber, a set of circumferential unfolding mechanisms (including six sets of sleeve mechanisms), six sets of rib assemblies, six sets of longitudinal extension arm assemblies, a circumferentially unfoldable thin film, a hexagonal prism thin film, and a beveled hexagonal prism thin film.

[0007] The bottom surface of the circumferential deployment mechanism connects to the bottom plate of the sunshade compartment. The ends of the included sleeves connect simultaneously to both the longitudinal extension arm assemblies and the bulkhead of the sunshade compartment. Each sleeve connects to one set of longitudinal extension arm assemblies. The connection between the sleeve and the bulkhead is a controllable unlocking clamping assembly. A set of rib assemblies connects two sets of longitudinal extension arm assemblies via flanges. The longitudinal extension arm assemblies are connected to the bulkhead of the sunshade compartment, and the rib assemblies are connected to the bottom plate of the sunshade compartment via clamping assemblies, which can be unlocked based on a signal. There are two sets of longitudinal extension arm assemblies containing three layers of longitudinal extension arms, two sets of longitudinal extension arm assemblies containing two layers of longitudinal extension arms, and two sets of longitudinal extension arm assemblies containing one layer of longitudinal extension arms. There is one set of rib assemblies containing four layers of ribs, three sets of rib assemblies containing three layers of ribs, six sets of rib assemblies containing two layers of ribs, and six sets of rib assemblies containing one layer of ribs. The two-layer and three-layer ribs have internal cavities. The one-layer rib has an internal cavity and a lower cavity. The circumferentially expandable film can be retracted into the bottom cavity of the rib assembly. The hexagonal prism film can be retracted into the first cavity of the rib assembly. The obliquely cut hexagonal prism film can be retracted into the second and third cavities of the rib assembly.

[0008] After receiving the unfolding command, the light shield unfolds in two stages: circumferential and longitudinal. The side unfolds into a beveled hexagonal prism shape, where a hexagonal prism is formed by obliquely cutting one side towards the opposite side. The direction of the oblique cut is the opening. The bottom unfolds into a hexagon.

[0009] During circumferential deployment, the clamping components between the sleeves and the bulkhead, the longitudinal extension arm assembly and the bulkhead, and the rib assembly and the bottom plate are first unlocked, releasing the circumferential deployment mechanism, the longitudinal extension arm assembly, and the rib assembly. The circumferential deployment mechanism is a single-degree-of-freedom mechanism that can synchronously deploy six sets of sleeves under the drive of a central motor, with each set of sleeves having five stages. The sleeves push the longitudinal extension arm assembly at the end to move radially. The rib assembly is pulled by the longitudinal extension arm assembly through flange A, and gradually stretches from a W-shape to an almost straight shape with the movement of the circumferential deployment mechanism. There is a linkage device inside the rib assembly to ensure the synchronicity of the rib assembly deployment. The internal connections of the rib assembly are all hinges. When the circumferential deployment mechanism is fully deployed, the hinges lock, at which point the six sets of rib assemblies form a regular hexagon, with a set of longitudinal extension arm assemblies at each corner of the hexagon. During the deployment of the circumferential deployment mechanism, the circumferentially deployable membrane that is gathered inside the bottom cavity of the rib assembly is gradually pulled out from the cavity, forming a hexagonal bottom surface after deployment.

[0010] After circumferential unfolding, longitudinal unfolding begins. Each longitudinal extension arm assembly contains a U-shaped clamping rope running through it, secured at both ends by clamping components. Upon commencement of longitudinal unfolding, the clamping components cut the clamping rope, and the longitudinal extension arm assembly moves upward under the drive of the bottom motor and lead screw mechanism. The longitudinal extension arm assembly has wing-shaped partitions at the base plate and a certain height for mounting the A-flange, which connects to the rib assembly. A longitudinal extension arm assembly containing three layers of longitudinal extension arms has a base plate and three wing-shaped partitions, providing four mounting points for the A-flange. A longitudinal extension arm assembly containing two layers of longitudinal extension arms has a base plate and two wing-shaped partitions. A longitudinal extension arm assembly containing one layer of longitudinal extension arms has a base plate and one wing-shaped partition. The A-flange drives the movement of each layer of the rib assembly. The hexagonal prism membrane and obliquely cut hexagonal prism membrane inside each layer of the rib assembly are extracted from the cavity as the longitudinal extension arm assembly moves, ultimately unfolding to form obliquely cut hexagonal prism surfaces.

[0011] The light shield of the present invention first achieves circumferential expansion through a set of circumferential expansion mechanisms. The circumferential expansion mechanisms push six sets of longitudinal extension arm assemblies into place and push six sets of rib assemblies to lock. Then the longitudinal extension arm assemblies extend, causing the rib assemblies and the film to form a beveled hexagonal prism shape.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) The present invention uses a circumferential unfolding mechanism, ribs, longitudinal extension arms and other skeleton structures to tension circumferential unfoldable film, hexagonal prism film, oblique hexagonal prism film and other film components to form a three-dimensional oblique hexagonal prism structure with extremely large size, high rigidity and high storage ratio.

[0014] (2) The present invention drives the longitudinal extension arm and ribs to unfold synchronously through the circumferential unfolding mechanism. The linkage device is installed inside the ribs to ensure the synchronicity of the unfolding. After the circumferential unfolding is completed, the sleeve mechanism and the ribs are locked by the locking mechanism respectively. The risk of jamming is low, and the unfolding and retraction can be completed automatically by changing the control command.

[0015] (3) This invention utilizes three layers of longitudinal extension arms to drive the longitudinal deployment of three layers of ribs, eliminating the need for an additional power source for the ribs. The longitudinal extension arms employ a foldable truss structure reinforced with diagonal tie rods and linear springs. The diagonal tie rods and linear springs apply internal stress to the truss to enhance the rigidity of the extension arms. The foldable truss structure ensures tight stacking through its shape design. The extension arms are deployed via a lead screw, resulting in rapid deployment. The longitudinal extension arm-rib system is modular and can be expanded as needed.

[0016] (4) The rib assembly of the present invention has the functions of improving structural rigidity and accommodating the film. When folded, the film is folded and placed into different cavities of the rib assembly. The cavities of the circumferentially unfolded film and the three-stage longitudinally unfolded film are independent of each other, so that the film trajectory is controllable during the unfolding process. The controllable unfolding trajectory makes it easy to install a zero-gravity unloading system.

[0017] (5) When the invention is retracted, the circumferential unfolding mechanism, rib assembly, and longitudinal extension arm assembly are all fixed to the light shield chamber, resulting in high rigidity. The clamping position provides space for personnel to operate, facilitating repeated unfolding and retraction and assembly of the clamping device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the sunshade of the present invention in its retracted state;

[0019] Figure 2 This is a front view of the sunshade of the present invention in its retracted state;

[0020] Figure 3 This is a schematic diagram of the light shield of the present invention after being unfolded circumferentially;

[0021] Figure 4 This is a front view of the light shield of the present invention after it has been unfolded circumferentially;

[0022] Figure 5 This is a partially enlarged schematic diagram of the light shield of the present invention after it has been unfolded circumferentially;

[0023] Figure 6 This is a schematic diagram of the light shield of the present invention in its fully deployed state;

[0024] Figure 7 This is an enlarged bottom view of the light shield of the present invention in its fully extended state.

[0025] Reference numerals: 1-Sunshade chamber; 2-Circumferential unfolding mechanism; 3-Longitudinal extension arm assembly; 4-Circumferentially unfoldable membrane; 5-Hexagonal prism membrane; 6-Beveled hexagonal prism membrane; 7-Rib assembly; 8-Three-layer longitudinal extension arm; 9-Two-layer longitudinal extension arm; 10-One-layer longitudinal extension arm; 11-Four-layer ribs; 12-Three-layer ribs; 13-Two-layer ribs; 14-One-layer ribs; 15-Rib clamping assembly; 16-Longitudinal extension arm clamping assembly; 17-Longitudinal extension arm base plate; 18-Longitudinal extension arm wing-shaped partition; 19-A flange; 20-Sunshade chamber base plate; 21-Sunshade chamber panel; 22-Sleeve assembly; 23-B flange; 24-Central drive unit. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] A space-based ultra-large three-dimensional retractable thin film sunshade is provided. When retracted, the sunshade is located inside and around the sunshade chamber 1. When unfolded, the hexagonal prism film 5 and the obliquely cut hexagonal prism film 6 together form the obliquely cut hexagonal prism side surface, and the circumferentially unfoldable film 4 forms a hexagonal bottom surface. It is suitable for space remote sensing satellites.

[0028] The sunshade compartment 1 comprises 6 sunshade compartment panels 21 and 1 sunshade compartment bottom plate 20.

[0029] The longitudinal extension arm assembly 3 is divided into three types, with two sets of each type. The first type of longitudinal extension arm assembly 3 includes a single longitudinal extension arm 10, a single longitudinal extension arm base plate 17, a single longitudinal extension arm wing-shaped partition 18, four A-flanges 19, and two longitudinal extension arm clamping assemblies 16; the second type of longitudinal extension arm assembly 3 includes two layers of longitudinal extension arms 9, a single longitudinal extension arm base plate 17, two longitudinal extension arm wing-shaped partitions 18, six A-flanges 19, and four longitudinal extension arm clamping assemblies 16; the third type of longitudinal extension arm assembly 3 includes three layers of longitudinal extension arms 8, a single longitudinal extension arm base plate 17, three longitudinal extension arm wing-shaped partitions 18, eight A-flanges 19, and six longitudinal extension arm clamping assemblies 16. Each set of longitudinal extension arm assembly 3 also includes a U-shaped clamping rope and a clamping assembly for the U-shaped clamping rope.

[0030] The third type of longitudinal extension arm assembly 3 has three pairs of longitudinal extension arm clamping assemblies 16, the second type of longitudinal extension arm assembly 3 has two pairs of longitudinal extension arm clamping assemblies 16, and the first type of longitudinal extension arm assembly 3 has one pair of longitudinal extension arm clamping assemblies 16. The longitudinal extension arm clamping assemblies 16 press the longitudinal extension arm assemblies 3 onto the facing sunshade compartment panels 21 respectively.

[0031] The rib assembly 7 is divided into 4 types, totaling 16 groups. The first type of rib assembly 7 consists of one layer of ribs 14, with 6 groups; the second type of rib assembly 7 consists of two layers of ribs 13, with 6 groups; the third type of rib assembly 7 consists of three layers of ribs 12, with 3 groups; and the fourth type of rib assembly 7 consists of four layers of ribs 11, with 1 group. Each rib assembly group contains several rib clamping components 15. All rib assemblies 7 located on one side of the hexagon are clamped onto the bottom plate 20 of the sunshade compartment by 2 groups of rib clamping components 15. The entire sunshade contains a total of 12 groups of rib clamping components 15.

[0032] The circumferential unfolding mechanism 2 includes a central drive unit 24 and 6 sets of sleeve assemblies 22, each set of sleeve assemblies 22 having a B flange 23 at its end.

[0033] Figure 1-2 With the sunshade in its retracted state, the bottom of the circumferential deployment mechanism 2 is connected to the bottom plate 21 of the sunshade compartment. The circumferential deployment mechanism 2 includes a central drive unit 24 and six sets of sleeve assemblies 22. The central drive unit contains a motor that can synchronously drive the six sets of sleeve assemblies 22 to deploy. The root level (defined as the level 0 sleeve) of the sleeve assembly 22 is connected to the compartment plate 21 of the sunshade compartment. The sleeve assembly 22 contains a clamping component for fixing the level 1-4 sleeves onto the level 0 sleeve. The end of the sleeve assembly 22 is connected to the longitudinal extension arm assembly 3 via a B flange 23. The third type of longitudinal extension arm assembly 3 has three pairs of longitudinal extension arm clamping components 16, the second type of longitudinal extension arm assembly 3 has two pairs of longitudinal extension arm clamping components 16, and the first type of longitudinal extension arm assembly 3 has one pair of longitudinal extension arm clamping components 16. The longitudinal extension arm clamping components 16 press the longitudinal extension arm assemblies 3 onto the facing sunshade compartment plate 21. In its folded state, the rib assembly 7 is W-shaped, partially extending into the interior of the light-shielding chamber 1, and is fixed to the bottom plate 20 of the light-shielding chamber by the rib clamping assembly 15. The rib assembly 7 is connected to the longitudinal extension arm assembly 3 via flange A 19, which is mounted on the longitudinal extension arm bottom plate 17 and the longitudinal extension arm wing-shaped partition 18 of the longitudinal extension arm assembly 3. The bottom of the first rib 14 has a cavity for storing the folded circumferentially expandable film 4. The first rib 14, the second rib 13, and the third rib 12 also have cavities for storing the folded hexagonal prism film 5 and the obliquely cut hexagonal prism film 6. The cavity openings are designed with limiting mechanisms to ensure that the films can be pulled out layer by layer in an orderly manner. In the folded state, a certain space is reserved inside the light-shielding chamber 1 to allow operators to enter and perform operations such as installing the clamping assembly and the circumferentially expandable film 4.

[0034] Upon receiving the deployment command, the rib clamping assembly 15 and the longitudinal extension arm clamping assembly 16 unlock, releasing the rib assembly 7 and the longitudinal extension arm assembly 3 respectively. The clamping assemblies inside each set of sleeve assemblies 22 unlock, releasing sleeves 1-4. The sleeve assemblies 22 expand synchronously under the drive of the central drive device 24 of the circumferential deployment mechanism 2, pushing the longitudinal extension arm assembly 3 to move. During the movement, the distance between the A flanges 19 gradually increases, thereby applying tension to the W-shaped rib assembly 7, gradually stretching it to an almost straight shape. The rib assembly 7 has an internal linkage mechanism to ensure that all rib assemblies expand synchronously. Each corner of the W-shape has a hinge; through the hinge locking angle design, the hinges inside the rib assembly 7 lock synchronously when the circumferential deployment mechanism 2 is fully deployed. As the W-shaped rib assembly 7 expands to a straight shape, the circumferentially expandable film 4 inside the bottom cavity of one layer of rib 14 is pulled out in an orderly manner, ultimately forming a hexagonal shape.

[0035] The portion of the light shield excluding the film is defined as the light shield frame. Figure 3-5 This is the state of the sunshade frame at the end of circumferential deployment. The longitudinal extension arm assembly 3 is a modular, deployable truss that can be deployed via a motor, gear transmission system, and lead screw inside the longitudinal extension arm base plate 17. The longitudinal extension arm assembly 3 is connected to the B flange 23 on the 4-stage sleeve via the longitudinal extension arm base plate 17. The longitudinal extension arm assembly 3 contains a U-shaped clamping rope that passes through the longitudinal extension arm base plate 17 and is fixed at both ends to the top surface of the longitudinal extension arm assembly 3. The A flange 19 on the longitudinal extension arm base plate 17 connects to a layer of ribs 14. The entire sunshade has a total of six sets of layers of ribs 14, forming a hexagon. During longitudinal deployment, the position of the longitudinal extension arm base plate 17 is fixed, therefore the position of the layer of ribs 14 is also fixed. There are three longitudinal extension arm wing-shaped partitions 18 between each layer of the three-layer longitudinal extension arms 8 and on the top surface, defined from low to high as the first layer longitudinal extension arm wing-shaped partition, the second layer longitudinal extension arm wing-shaped partition, and the third layer longitudinal extension arm wing-shaped partition. Each layer of the two-layer longitudinal extension arm 9 has two longitudinal extension arm wing-shaped partitions 18 between layers and on the top surface. The top surface of the first-layer longitudinal extension arm 10 has one longitudinal extension arm wing-shaped partition 18. All the first-layer longitudinal extension arm wing-shaped partitions are connected to the second-layer ribs 13 via flange A 19, forming six sets and a hexagon. All the second-layer longitudinal extension arm wing-shaped partitions are connected to the third-layer ribs 12 via flange A 19, forming three sets and half of a hexagon, similar to a C-shape. All the third-layer longitudinal extension arm wing-shaped partitions are connected to the fourth-layer ribs 11 via flange A 19, forming only one set and one side of a hexagon. The hexagonal prism membrane 5 is folded and stored in the cavity of the first-layer rib 14, and the obliquely cut hexagonal prism membrane 6 is folded and stored in the cavities of the second-layer ribs 13 and the third-layer ribs 12. The fourth-layer rib 11 has no cavity and is only used to fix the top of the obliquely cut hexagonal prism membrane 6.

[0036] like Figure 6 As shown, after the circumferential unfolding is completed, the light shield receives a signal and begins to unfold longitudinally. The clamping device cuts the clamping rope according to the command, and the motor inside the longitudinal extension arm base plate 17 drives the lead screw to rotate. The lead screw drives the unfoldable truss to unfold step by step from the top. When the longitudinal extension arm assembly 3 unfolds to the stage where the longitudinal extension arm wing-shaped partition 18 is located, it will drive the longitudinal extension arm wing-shaped partition 18 to move upward together. The longitudinal extension arm wing-shaped partition 18 drives the connected rib assembly 7 to move. The four layers of ribs 11 unfold first, pulling the obliquely cut hexagonal prism film 6 out of the cavity of the three layers of ribs 12 in an orderly manner. When the longitudinal extension arm assembly 3 unfolds to the stage where the three layers of ribs 12 are located, the second layer of longitudinal extension arm wing-shaped partition begins to move, driving the second layer of ribs 13 to move upward. At this time, the film in the cavity of the three layers of ribs 12 has been fully unfolded, and the three layers of ribs 12 begin to pull the film in the cavity of the second layer of ribs 13. When the longitudinal extension arm assembly 3 extends to the stage where the second rib 13 is located, the second rib 13 pulls the membrane out of the cavity of the first rib 14. The first rib 14 remains stationary during the longitudinal extension process. Finally, when all the longitudinal extension arm assemblies 3 are fully extended, all the rib assemblies 7 are also in place simultaneously, and the membrane in the cavity is fully extended, forming a beveled hexagonal side.

[0037] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A space-based ultra-large-size three-dimensional multi-deployment thin-film light shield, characterized in that, It includes a light-shielding chamber, a circumferentially deployable mechanism, sixteen sets of rib assemblies, six sets of longitudinally extendable arm assemblies, a circumferentially deployable membrane, a hexagonal prism membrane, and a beveled hexagonal prism membrane; After unfolding, the hexagonal prism film and the obliquely cut hexagonal prism film together form the obliquely cut hexagonal prism side surface, and the circumferentially unfoldable film forms the hexagonal base surface; The bottom surface of the circumferential deployment mechanism is connected to the bottom plate of the sunshade compartment. The end of the sleeve contained in the circumferential deployment mechanism is simultaneously connected to the longitudinal extension arm assembly and the bulkhead of the sunshade compartment. Each sleeve connects to one set of longitudinal extension arm assemblies. The connection between the sleeve and the bulkhead is a controllable unlocking clamping assembly. A set of rib assemblies is connected between the two sets of longitudinal extension arm assemblies via flanges. The longitudinal extension arm assemblies are connected to the bulkhead of the sunshade compartment, and the rib assemblies are connected to the bottom plate of the sunshade compartment via clamping assemblies, which can be unlocked according to a signal. Two sets of longitudinal extension arm assemblies contain three layers of longitudinal extension arms. The extendable arm assembly includes two layers of longitudinal extendable arms, and two sets of longitudinal extendable arm assemblies include one layer of longitudinal extendable arms; one set of rib assemblies includes four layers of ribs, three sets of rib assemblies include three layers of ribs, six sets of rib assemblies include two layers of ribs, and six sets of rib assemblies include one layer of ribs; the two-layer and three-layer ribs have cavities inside; the one-layer rib has a bottom cavity in addition to its internal cavity; a circumferentially expandable membrane can be retracted into the bottom cavity of the one-layer rib assembly; a hexagonal prism membrane can be retracted into the first-layer cavity of the rib assembly; and a beveled hexagonal prism membrane can be retracted into the second and third-layer cavities of the rib assembly. Each of the three longitudinal extension arms has three longitudinal extension arm wing-shaped partitions between layers and on the top surface, defined from low to high as the first longitudinal extension arm wing-shaped partition, the second longitudinal extension arm wing-shaped partition, and the third longitudinal extension arm wing-shaped partition. All the first longitudinal extension arm wing-shaped partitions are connected to the second layer of ribs via flange A, totaling six sets, forming a hexagon. All the second longitudinal extension arm wing-shaped partitions are connected to the third layer of ribs via flange A, totaling three sets, forming half of a hexagon, similar to a C shape. All the third longitudinal extension arm wing-shaped partitions are connected to the fourth layer of ribs via flange A, with only one set, forming one side of a hexagon.

2. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 1, characterized in that, The circumferential deployment mechanism includes a central drive unit and six sets of sleeve assemblies, each with a B-flange at its end. The bottom of the circumferential deployment mechanism is connected to the bottom plate of the sunshade compartment. The central drive unit contains a motor that can synchronously drive the six sets of sleeve assemblies to deploy. The root level of the sleeve assembly is defined as the level 0 sleeve and is connected to the sunshade compartment plate. The sleeve assembly contains a clamping component to fix the level 1-4 sleeves onto the level 0 sleeve. The end of the sleeve assembly is connected to the longitudinal extension arm assembly via a B-flange.

3. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 2, characterized in that, After receiving the deployment command, the rib clamping assembly and the longitudinal extension arm clamping assembly unlock, releasing the rib assembly and the longitudinal extension arm assembly respectively; the clamping assembly inside each set of sleeve assemblies unlocks, releasing the 1st to 4th stage sleeves; the sleeve assemblies are synchronously deployed under the drive of the central drive device of the circumferential deployment mechanism, pushing the longitudinal extension arm assembly to move; during the movement, the distance between the A flanges gradually increases, thereby applying tension to the W-shaped rib assembly, gradually stretching the rib assembly to an almost straight shape.

4. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 2, characterized in that, The longitudinal extension arm assembly is a modular, deployable truss that can be deployed via a motor, gear transmission system, and lead screw driven inside the longitudinal extension arm base plate. The longitudinal extension arm assembly is connected to the B flange on the 4-stage sleeve via the longitudinal extension arm base plate. The longitudinal extension arm assembly contains a U-shaped clamping rope that passes through the longitudinal extension arm base plate and is fixed at both ends to the top surface of the longitudinal extension arm assembly. The A flange on the longitudinal extension arm base plate connects to a layer of ribs; the entire light shield consists of six sets of one-layer ribs, forming a hexagon. During longitudinal deployment, the position of the longitudinal extension arm base plate is fixed, therefore the position of the first-layer ribs is also fixed. There are two longitudinal extension arm wing-shaped partitions between each layer of the second-layer longitudinal extension arm and on its top surface; there is one longitudinal extension arm wing-shaped partition on the top surface of the first-layer longitudinal extension arm. The hexagonal prism film is folded and stored in the cavity of the first-layer rib, and the obliquely cut hexagonal prism film is folded and stored in the cavities of the second and third layers of ribs. The fourth layer of ribs has no cavity and is only used to fix the top of the obliquely cut hexagonal prism film.

5. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 4, characterized in that, After circumferential deployment, the sunshade receives a signal and begins longitudinal deployment. The clamping device cuts the clamping rope as instructed, and the motor inside the longitudinal extension arm's base plate drives the lead screw to rotate. The lead screw drives the deployable truss to unfold from the top step by step. When the longitudinal extension arm assembly unfolds to the stage where the longitudinal extension arm's wing-shaped partition is located, it will drive the longitudinal extension arm's wing-shaped partition to move upward together. The longitudinal extension arm's wing-shaped partition drives the connected rib assembly to move. The four layers of ribs unfold first, orderly pulling the obliquely cut hexagonal prism membrane out from the cavity of the three layers of ribs. When the longitudinal extension arm assembly unfolds to the three layers... When the ribs are in their respective stages, the second layer of longitudinal extension arm wing-shaped septa begins to move, driving the second layer of ribs upward; at this time, the membrane in the cavity of the third layer of ribs has been fully unfolded, and the third layer of ribs begins to pull the membrane out of the cavity of the second layer of ribs; when the longitudinal extension arm assembly unfolds to the stage where the second layer of ribs is located, the second layer of ribs pulls the membrane out of the cavity of the first layer of ribs; the first layer of ribs remains stationary during the longitudinal unfolding process; finally, when all longitudinal extension arm assemblies are fully unfolded, all rib assemblies are also in place synchronously, and the membrane in the cavity has been fully unfolded, forming a beveled hexagonal side.

6. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 1, characterized in that, When the rib assembly is folded up, it is W-shaped and partially extends into the interior of the sunshade compartment. It is fixed to the bottom plate of the sunshade compartment by the rib clamping assembly.

7. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 6, characterized in that, Each corner of the W-shape has a hinge. Through the locking angle design of the hinges, the hinges inside the rib assembly can be locked synchronously when the circumferential unfolding mechanism is fully unfolded.

8. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 6, characterized in that, When the W-shaped rib assembly unfolds into a straight line, the circumferentially unfoldable membrane inside the cavity at the bottom of one rib is pulled out in an orderly manner, eventually forming a hexagonal shape.

9. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 1, characterized in that, The longitudinal extension arm assembly is connected to and pressed against the side of the sunshade compartment panel facing the sunshade compartment using a longitudinal extension arm clamping assembly.

10. The space-based ultra-large-size three-dimensional multi-expansion thin-film light shield according to claim 1, characterized in that, The rib assembly is connected to the longitudinal extension arm assembly via the A flange of the longitudinal extension arm assembly. The A flange is mounted on the longitudinal extension arm base plate and the longitudinal extension arm wing-shaped partition of the longitudinal extension arm assembly.

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