Space-based oversized three-dimensional multi-unfolding film light shield

Abstract

According to the space-based oversize three-dimensional multi-unfolding film light shield, the bottom face of a circumferential unfolding mechanism is connected with a bottom plate of a light shield cabin, the tail ends of sleeves are connected with longitudinal stretching arm assemblies and the cabin wall of the light shield cabin at the same time, and each sleeve is connected with one longitudinal stretching arm assembly. A pressing assembly capable of being controlled to be unlocked is arranged at the joint of the sleeve and the bulkhead. A set of rib assembly is connected between the two sets of longitudinal extending arm assemblies through flanges. The longitudinal extension arm assembly is connected with the cabin wall of the light shield cabin through a pressing assembly, the rib assembly is connected with the bottom plate of the light shield cabin through a pressing assembly, and unlocking can be achieved according to signals. The longitudinal stretching arm assemblies are divided into three types, and each type comprises two groups. The rib assemblies are divided into four types, totally 16 groups. Cavities are formed in the second-layer ribs and the third-layer ribs. The first layer of ribs is further provided with a bottom layer cavity besides the inner cavity. And the circumferential expandable film can be folded into the bottom layer cavity of the first layer of rib assembly. The hexagonal prism film can be folded into the first layer of cavity of the rib assembly. The beveled hexagonal prism films can be folded into the second-layer cavity and the third-layer cavity of the rib assembly.

Description

Technical Field

[0001] The present invention relates to a space-based ultra-large-scale three-dimensional multi-expandable thin film sunshade, in particular to an ultra-large-scale, lightweight, and large-storage-ratio expandable thin film sunshade structure, which is mainly used for shading and heat insulation. Background Art

[0002] With the continuous deepening of space exploration activities, the demand for ultra-large aperture cameras in future space missions is increasing. Traditional sunshades are generally rigid structures composed of carbon fiber honeycomb panels. Due to the shortcomings of large launch volume, heavy weight, and insufficient rigidity, they can no longer meet the requirements of transportation. The expandable film sunshade has the advantages of light weight and large storage ratio. Chinese patent CN201911209046.3 "A system for expanding the side sunshade of an optical imaging satellite" can simultaneously expand the cylindrical sunshade film in the axial and radial directions. There are 6 folding rods at the bottom of the sunshade, and each rod is divided into an upper section and a lower section. At the center of the top of the sunshade is a series of telescopic rings. One end of the sunshade 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 rod at the bottom of the sunshade are driven by a motor to expand from a folded state to a straight state, and the ends of the 6 rods after expansion form a regular hexagon. The top of the sunshade is extended by driving the telescopic ring through the "screw-guide rail" to achieve the longitudinal extension of the sunshade. When the "screw-guide rail" reaches the preset position, the support arm will push the support rod to rotate to achieve the top of the sunshade. The shape of the fully expanded shading film is a hexagonal prism. The sunshade has a large expansion area, but the entire mechanism contains multiple groups of different motors, and the expansion process requires these motors to move in a specified order and speed. The mechanism is complex and has low basic reliability. After expansion, the telescopic ring is located inside the sunshade and will block the light path. Chinese patent CN202011057876.1 "A deployable film sunshade" adopts the "film multilayer + body deployable skeleton" design. The deployable skeleton contains two layers and a total of 4 connecting rod frames that can be driven to expand by energy storage springs. After the compression release device is unlocked, the deployable skeleton is deployed under the drive of the energy storage spring, and the deployment synchronization is ensured by the rope linkage between the frames, driving the multi-layer film to expand into a beveled hexagonal prism structure. This design has advantages such as light weight and large storage ratio, but when the size scale is further increased, the modular configuration needs to further increase the rod units, and the deployment process of multiple rod units driven by the energy storage spring will be further complicated. The interaction between the rope linkage and the energy storage spring drive is difficult to analyze. On the one hand, the motion trajectory of the rod unit is difficult to predict, which increases the risk of hooking between the deployment mechanism and the film; on the other hand, under the interaction between the rope linkage and the energy storage spring, the driving force of the end of multiple groups of rods on the film is small, and there is a risk that the sunshade cannot be deployed in place. Therefore, the reliability of this design is low after the scale is increased, and it cannot be applied to super-large sunshades.

[0003] In order to solve the above problems, especially to meet the demand of satellite payload for ultra-large and high storage ratio deployable film sunshade, the present invention proposes a three-dimensional multi-deployable film sunshade with simple configuration, light weight, large storage ratio and high rigidity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and solve the problems that the launch volume and mass of the traditional sunshade cannot meet the transportation requirements, or the deployment mechanism is complex, the rigidity is low after deployment, and the folded volume is large.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A space-based super-large-size three-dimensional multi-expandable film sunshade mainly consists of a sunshade cabin, a set of circumferential expansion mechanisms (including six sets of sleeve mechanisms), six groups of rib assemblies, six groups of longitudinal extension arm assemblies, a circumferentially expandable film, a hexagonal prism film, and a beveled hexagonal prism film.

[0007] The bottom surface of the circumferential deployment mechanism is connected to the bottom plate of the sunshade cabin, and the end of the sleeve contained therein is connected to the longitudinal extension arm assembly and the bulkhead of the sunshade cabin at the same time, and each sleeve is connected to a set of longitudinal extension arm assemblies. The connection between the sleeve and the bulkhead is a clamping assembly that can be unlocked in a controlled manner. A set of rib assemblies is connected between the two sets of longitudinal extension arm assemblies through a flange. The longitudinal extension arm assembly and the bulkhead of the sunshade cabin, and the rib assembly and the bottom plate of the sunshade cabin are respectively connected by clamping assemblies, which can be unlocked according to signals. 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. There are cavities inside the second layer of ribs and the third layer of ribs. In addition to the internal cavity, the first layer of ribs also has a bottom layer cavity. The circumferentially expandable film can be gathered into the bottom cavity of a rib assembly. The hexagonal prism film can be gathered into the first cavity of a rib assembly. The obliquely cut hexagonal prism film can be gathered into the second and third cavities of a rib assembly.

[0008] After receiving the unfolding instruction, the visor unfolds into a beveled hexagonal film through two unfolding processes: circumferential unfolding and longitudinal unfolding. The beveled hexagonal film is formed by beveling one side of the hexagonal film toward the opposite side. The opening is in the beveled direction. The bottom surface unfolds into a hexagon.

[0009] During the circumferential deployment process, first, the clamping components between the sleeve and the bulkhead, the longitudinal extension arm assembly and the bulkhead, and the rib assembly and the bottom plate are unlocked to release 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 driven by a central motor, and each set of sleeves has five levels. The sleeve pushes the longitudinal extension arm assembly at the end to move radially. The rib assembly is pulled by the longitudinal extension arm assembly through the A flange, and gradually pulls from a W shape to a nearly straight shape with the movement of the circumferential deployment mechanism. There is a linkage device inside the rib assembly to ensure the synchronization of the deployment of the rib assembly. The internal connections of the rib assembly are all hinges. When the circumferential deployment mechanism is fully deployed, the hinges are locked. At this time, the six sets of rib assemblies form a regular hexagon, and each corner of the hexagon has a set of longitudinal extension arm assemblies. During the deployment of the circumferential deployment mechanism, the circumferential deployable film gathered inside the bottom cavity of the rib assembly is gradually pulled out of the cavity, and a hexagonal bottom surface is formed after the deployment is completed.

[0010] After the circumferential expansion is completed, the longitudinal expansion is carried out. Each set of longitudinal extension arm assemblies has a U-shaped compression rope that runs through the longitudinal extension arm assembly, and the two ends are fixed by the compression assembly. After the longitudinal expansion begins, the compression assembly cuts off the compression rope, and the longitudinal extension arm assembly moves upward driven by the bottom motor and the screw mechanism. The longitudinal extension arm assembly is provided with wing-shaped partitions on the bottom plate and at a certain height for installing the A flange, and the A flange is connected to the rib assembly. The longitudinal extension arm assembly including three layers of longitudinal extension arms has a bottom plate and three wing-shaped partitions, and a total of four places are used to install the A flange. The longitudinal extension arm assembly including two layers of longitudinal extension arms has a bottom plate and two wing-shaped partitions. The longitudinal extension arm assembly including one layer of longitudinal extension arms has a bottom plate and a wing-shaped partition. The A flange drives the movement of each layer of the rib assembly. The hexagonal prism film and the beveled hexagonal prism film inside each layer of the cavity of the rib assembly are drawn out of the cavity with the movement of the longitudinal extension arm assembly, and finally unfolded to form a beveled hexagonal prism surface.

[0011] The sunshade of the present invention is firstly expanded circumferentially by a group of circumferential expansion mechanisms, which push six groups of longitudinal extension arm assemblies into place and push six groups of rib assemblies to lock, and then the longitudinal extension arm assemblies extend, driving 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 beneficial effects:

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

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

[0015] (3) The present invention drives the three layers of ribs to expand longitudinally through three layers of longitudinal extension arms, and the ribs do not require an additional power source. The longitudinal extension arm adopts a foldable truss structure reinforced by a diagonal lock and a linear spring. The diagonal lock and the linear spring apply internal stress to the truss to increase the rigidity of the extension arm. The foldable truss structure ensures tight stacking through shape design. The extension arm is driven to expand by a screw and has a fast expansion speed. The longitudinal extension arm-rib system has modular characteristics and can be expanded as needed.

[0016] (4) The rib assembly of the present invention has the functions of improving structural rigidity and storing films. When folding, the films are folded and placed in different cavities of the rib assembly. The cavities for the circumferentially unfolded films and the three-level longitudinally unfolded films are independent of each other, so that the film trajectory can be controlled during the unfolding process. The unfolding trajectory is controllable, and the zero-gravity unloading system is easy to install.

[0017] (5) The present invention fixes the circumferential deployment mechanism, rib assembly, and longitudinal extension arm assembly on the sunshade cabin when folded, and has high rigidity. The clamping position reserves space for personnel operation, which is convenient for repeated deployment and assembly of the clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 This is a front view of the hood of the present invention in a folded state;

[0020] Figure 3 This is a schematic diagram of the sunshade of the present invention after circumferential expansion;

[0021] Figure 4 This is a front view of the sunshade of the present invention after circumferential expansion;

[0022] Figure 5 It is a partial enlarged schematic diagram of the light shield of the present invention after circumferential expansion;

[0023] Figure 6 This is a schematic diagram of the sunshade of the present invention in a fully unfolded state;

[0024] Figure 7 It is an enlarged bottom schematic diagram of the sunshade of the present invention in a fully unfolded state.

[0025] Figure markings: 1-shade cabin; 2-circumferential expansion mechanism; 3-longitudinal extension arm assembly; 4-circumferentially expandable film; 5-hexagonal prism film; 6-beveled hexagonal prism film; 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 bottom plate; 18-longitudinal extension arm wing-shaped partition; 19-A flange; 20-shade cabin bottom plate; 21-shade cabin cabin plate; 22-sleeve assembly; 23-B flange; 24-central drive device. DETAILED DESCRIPTION

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

[0027] A space-based super-large-sized three-dimensional multi-expandable film sunshade. When folded, the sunshade is located inside and around a sunshade cabin 1. When unfolded, a hexagonal prism film 5 and a beveled hexagonal prism film 6 together form a beveled hexagonal prism-shaped side surface, and a circumferentially expandable film 4 forms a hexagonal bottom surface, which is suitable for space remote sensing satellites.

[0028] The sunshade cabin 1 comprises six sunshade cabin panels 21 and one sunshade cabin bottom panel 20 .

[0029] The longitudinal extension arm assembly 3 is divided into 3 types, each with 2 groups. The first type of longitudinal extension arm assembly 3 includes a layer of longitudinal extension arm 10, a longitudinal extension arm bottom plate 17, a longitudinal extension arm wing-shaped partition 18, 4 A flanges 19, and 2 longitudinal extension arm clamping assemblies 16; the second type of longitudinal extension arm assembly 3 includes a second layer of longitudinal extension arm 9, a longitudinal extension arm bottom plate 17, 2 longitudinal extension arm wing-shaped partitions 18, 6 A flanges 19, and 4 longitudinal extension arm clamping assemblies 16; the third type of longitudinal extension arm assembly 3 includes a third layer of longitudinal extension arm 8, a longitudinal extension arm bottom plate 17, 3 longitudinal extension arm wing-shaped partitions 18, 8 A flanges 19, and 6 longitudinal extension arm clamping assemblies 16. Each group of longitudinal extension arm assemblies 3 also includes a U-shaped clamping rope and a clamping assembly of the U-shaped clamping rope.

[0030] The third longitudinal extension arm assembly 3 has three pairs of longitudinal extension arm clamping assemblies 16, the second longitudinal extension arm assembly 3 has two pairs of longitudinal extension arm clamping assemblies 16, and the first longitudinal extension arm assembly 3 has one pair of longitudinal extension arm clamping assemblies 16. The longitudinal extension arm clamping assemblies 16 respectively clamp the longitudinal extension arm assemblies 3 on the facing sunshade cabin panel 21.

[0031] The rib assembly 7 is divided into 4 types, with a total of 16 groups. The first type of rib assembly 7 is a single layer of ribs 14, with a total of 6 groups; the second type of rib assembly 7 is a double layer of ribs 13, with a total of 6 groups; the third type of rib assembly 7 is a triple layer of ribs 12, with a total of 3 groups; the fourth type of rib assembly 7 is a quad layer of ribs 11, with a total of 1 group; each group of rib assemblies includes a number of rib pressing assemblies 15, and all rib assemblies 7 located on one side of the hexagon are pressed on the bottom plate 20 of the sunshade cabin by two groups of rib pressing assemblies 15, and the entire sunshade includes a total of 12 groups of rib pressing assemblies 15.

[0032] The circumferential unfolding mechanism 2 comprises a central driving device 24 and six sets of sleeve assemblies 22 , and each set of sleeve assemblies 22 has a B flange 23 at the end.

[0033] Figure 1-2 In the folded state of the sunshade, the bottom of the circumferential deployment mechanism 2 is connected to the bottom plate 21 of the sunshade cabin. The circumferential deployment mechanism 2 includes a central drive device 24 and 6 groups of sleeve assemblies 22. The central drive device has a motor inside, which can synchronously drive the 6 groups of sleeve assemblies 22 to deploy. The root level of the sleeve assembly 22 (defined as the level 0 sleeve) is connected to the sunshade cabin cabin 21. There is a clamping assembly inside the sleeve assembly 22 for fixing the level 1-4 sleeves on the level 0 sleeve. The end of the sleeve assembly 22 is connected to the longitudinal extension arm assembly 3 through the B flange 23. The third longitudinal extension arm assembly 3 has 3 pairs of longitudinal extension arm clamping assemblies 16, the second longitudinal extension arm assembly 3 has 2 pairs of longitudinal extension arm clamping assemblies 16, and the first longitudinal extension arm assembly 3 has 1 pair of longitudinal extension arm clamping assemblies 16. The longitudinal extension arm clamping assemblies 16 respectively clamp the longitudinal extension arm assemblies 3 on the facing sunshade cabin cabin 21. The rib assembly 7 is W-shaped in the folded state, partially extending into the interior of the sunshade cabin 1, and is fixed to the bottom plate 20 of the sunshade cabin through the rib clamping assembly 15. The rib assembly 7 is connected to the longitudinal extension arm assembly 3 through the A flange 19, and the A flange 19 is installed on the longitudinal extension arm bottom plate 17 and the longitudinal extension arm wing-shaped partition 18 of the longitudinal extension arm assembly 3. There is a cavity at the bottom of the first layer of ribs 14 for storing the folded circumferentially expandable film 4. There are other cavities inside the first layer of ribs 14, the second layer of ribs 13, and the third layer of ribs 12 for storing the folded hexagonal prism film 5 and the beveled hexagonal prism film 6. The limit design at the opening of the cavity ensures that the film can be pulled out layer by layer and in order. In the folded state, a certain space is reserved in the sunshade cabin 1 to allow operators to enter and perform operations such as installing the clamping assembly and the circumferentially expandable film 4.

[0034] After the sunshade receives the deployment command, the rib clamping assembly 15 and the longitudinal extension arm clamping assembly 16 are unlocked, releasing the rib assembly 7 and the longitudinal extension arm assembly 3 respectively. The clamping assembly inside each set of sleeve assemblies 22 is unlocked, releasing the 1-4 level sleeves. The sleeve assembly 22 is synchronously deployed 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 a pulling force to the W-shaped folded rib assembly 7, gradually stretching the rib assembly 7 to a shape close to a straight line. There is a linkage mechanism inside the rib assembly 7 to ensure that all rib assemblies are deployed synchronously. There is a hinge at each corner point of the W shape. Through the locking angle design of the hinge, the hinge inside the rib assembly 7 can be synchronously locked when the circumferential deployment mechanism 2 is fully deployed. As the W-shaped rib assembly 7 is deployed to a straight line, the circumferentially deployable film 4 in the bottom cavity of a layer of ribs 14 is pulled out in an orderly manner, and finally a hexagonal shape is formed.

[0035] The part of the sunshade excluding the film is defined as the sunshade skeleton. Figure 3-5 The state of the light shield skeleton at the end of circumferential expansion. The longitudinal extension arm assembly 3 is a modular expandable truss, which can be expanded by the motor, gear transmission system and lead screw drive inside the longitudinal extension arm bottom plate 17. The longitudinal extension arm assembly 3 is connected to the B flange 23 on the 4-stage sleeve through the longitudinal extension arm bottom plate 17. There is a U-shaped compression rope inside the longitudinal extension arm assembly 3, which passes through the longitudinal extension arm bottom plate 17 and is fixed at both ends on the top surface of the longitudinal extension arm assembly 3. The A flange 19 on the longitudinal extension arm bottom plate 17 is connected to a layer of ribs 14. The entire light shield has a total of six groups of one layer of ribs 14, forming a hexagon. During the longitudinal expansion process, the position of the longitudinal extension arm bottom plate 17 is fixed, so the position of one layer of ribs 14 is fixed. There are three longitudinal extension arm wing-shaped partitions 18 between each layer and on the top surface of the three-layer longitudinal extension arm 8, which are defined from low to high as the first layer of longitudinal extension arm wing-shaped partitions, the second layer of longitudinal extension arm wing-shaped partitions, and the third layer of longitudinal extension arm wing-shaped partitions. There are two longitudinal extension arm wing-shaped partitions 18 between each layer and on the top surface of the second-layer longitudinal extension arm 9, and there is one longitudinal extension arm wing-shaped partition 18 on the top surface of the first-layer longitudinal extension arm 10. All the first-layer longitudinal extension arm wing-shaped partitions are connected to the second-layer ribs 13 through the A flange 19, and there are six groups in total, forming a hexagon. All the second-layer longitudinal extension arm wing-shaped partitions are connected to the third-layer ribs 12 through the A flange 19, and there are three groups in total, forming half of the hexagon, similar to the C shape. All the third-layer longitudinal extension arm wing-shaped partitions are connected to the fourth-layer ribs 11 through the A flange 19, and there is only one group, forming one side of the hexagon. The hexagonal film 5 is folded and stored in the cavity of the first-layer rib 14, and the beveled hexagonal film 6 is folded and stored in the cavity of the second-layer rib 13 and the third-layer rib 12. The fourth-layer rib 11 has no cavity and is only used to fix the top of the beveled hexagonal film 6.

[0036] like Figure 6 As shown, after the circumferential expansion is completed, the light shield receives a signal and starts to expand longitudinally, the clamping device cuts off the clamping rope according to the command, and the motor inside the longitudinal extension arm bottom plate 17 drives the lead screw to rotate, and the lead screw drives the expandable truss to expand step by step from the top. When the longitudinal extension arm assembly 3 is expanded to the level 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, and the longitudinal extension arm wing-shaped partition 18 drives the connected rib assembly 7 to move. The four-layer rib 11 is first expanded, and the oblique hexagonal prism film 6 is pulled out of the cavity of the three-layer rib 12 in an orderly manner. When the longitudinal extension arm assembly 3 is expanded to the level where the three-layer rib 12 is located, the second-layer longitudinal extension arm wing-shaped partition begins to move, driving the second-layer rib 13 to move upward. At this time, the film in the cavity of the three-layer rib 12 has been fully expanded, and the three-layer rib 12 begins to pull out the film in the cavity of the second-layer rib 13. When the longitudinal extension arm assembly 3 is extended to the level where the second layer rib 13 is located, the second layer rib 13 pulls the film out of the cavity of the first layer rib 14. The first layer rib 14 remains stationary during the longitudinal extension process. Finally, when all longitudinal extension arm assemblies 3 are fully extended, all rib assemblies 7 are also in place synchronously, and the film in the cavity has been fully extended to form a chamfered hexagonal side.

[0037] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

[0038] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A space-based ultra-large-scale three-dimensional multi-expandable film sunshade, characterized in that: It includes a sunshade cabin, a circumferential unfolding mechanism, six groups of rib assemblies, six groups of longitudinal extension arm assemblies, a circumferentially unfoldable film, a hexagonal prism film, and a beveled hexagonal prism film; After unfolding, the hexagonal prism film and the obliquely cut hexagonal prism film together form an obliquely cut hexagonal prism-shaped side surface, and the circumferentially unfoldable film forms a hexagonal bottom surface; The bottom surface of the circumferential deployment mechanism is connected to the bottom plate of the sunshade cabin. The end of the sleeve contained in the circumferential deployment mechanism is connected to the longitudinal extension arm assembly and the bulkhead of the sunshade cabin at the same time. Each set of sleeves is connected to a set of longitudinal extension arm assemblies; the connection between the sleeve and the bulkhead is a clamping assembly that can be unlocked in a controlled manner; a set of rib assemblies is connected between the two sets of longitudinal extension arm assemblies through a flange; the longitudinal extension arm assembly and the bulkhead of the sunshade cabin, and the rib assembly and the bottom plate of the sunshade cabin are respectively connected through clamping assemblies, which can be unlocked according to signals; there are two sets of longitudinal extension arm assemblies including three layers of longitudinal extension arms, and two sets of longitudinal The extension arm assembly includes two layers of longitudinal extension arms, and two groups of longitudinal extension arm assemblies include one layer of longitudinal extension arms; one group of rib assemblies includes four layers of ribs, three groups of rib assemblies include three layers of ribs, six groups of rib assemblies include two layers of ribs, and six groups of rib assemblies include one layer of ribs; the second and third layers of ribs have cavities inside; the first layer of ribs has a bottom cavity in addition to the internal cavity; the circumferentially expandable film can be folded into the bottom cavity of a first layer of rib assemblies; the hexagonal prism film can be folded into the first layer of cavity of the rib assembly; the obliquely cut hexagonal prism film can be folded into the second and third layers of cavities of the rib assembly.

2. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 1, characterized in that: The circumferential deployment mechanism includes a central driving device and 6 sets of sleeve assemblies, and each set of sleeve assemblies has a B flange at the end; the bottom of the circumferential deployment mechanism is connected to the bottom plate of the sunshade cabin; there is a motor inside the central driving device, which can synchronously drive the 6 sets of sleeve assemblies to deploy; the root level of the sleeve assembly is defined as the level 0 sleeve, which is connected to the sunshade cabin cabin; there is a clamping assembly inside the sleeve assembly for fixing the level 1-4 sleeves on the level 0 sleeve; the end of the sleeve assembly is connected to the longitudinal extension arm assembly through the B flange.

3. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 2, characterized in that: After the sunshade receives the deployment command, the rib clamping assembly and the longitudinal extension arm clamping assembly are unlocked, releasing the rib assembly and the longitudinal extension arm assembly respectively; the clamping assembly inside each set of sleeve assemblies is unlocked, releasing the 1-4 level 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 folded rib assembly, gradually stretching the rib assembly to a shape close to a straight line.

4. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 2, characterized in that: The longitudinal extension arm assembly is a modular deployable truss, which can be deployed through the motor, gear transmission system and lead screw drive inside the longitudinal extension arm base plate; the longitudinal extension arm assembly is connected to the B flange on the 4-stage sleeve through the longitudinal extension arm base plate; there is a U-shaped compression rope inside the longitudinal extension arm assembly, the rope passes through the longitudinal extension arm base plate, and both ends are fixed on the top surface of the longitudinal extension arm assembly; the A flange on the longitudinal extension arm base plate is connected to a layer of ribs, and the entire sunshade has a total of six groups of one layer of ribs, forming a hexagon; the position of the longitudinal extension arm base plate is fixed during the longitudinal deployment process, so the position of one layer of ribs is fixed; there are three longitudinal extension arm wing-shaped partitions between each layer and on the top surface of the three-layer longitudinal extension arm, which are defined from low to high as the first layer of longitudinal extension arm wing-shaped partitions, the second layer of longitudinal extension arm wing-shaped partitions, and the third layer of longitudinal extension arm wing-shaped partitions. There are two longitudinal stretching arm wing-shaped partitions between each layer and the top surface of the second-layer longitudinal stretching arm, and there is one longitudinal stretching arm wing-shaped partition on the top surface of the first-layer longitudinal stretching arm; all the first-layer longitudinal stretching arm wing-shaped partitions are connected to the second-layer ribs through the A flange, and there are six groups in total to form a hexagon; all the second-layer longitudinal stretching arm wing-shaped partitions are connected to the third-layer ribs through the A flange, and there are three groups in total to form half of the hexagon, similar to the C shape; all the third-layer longitudinal stretching arm wing-shaped partitions are connected to the fourth-layer ribs through the A flange, and there is only one group to form one side of the hexagon; the hexagonal prism film is folded and stored in the cavity of the first-layer rib, and the beveled hexagonal prism film is folded and stored in the cavity of the second and third-layer ribs; the fourth-layer rib has no cavity and is only used to fix the top of the beveled hexagonal prism film.

5. The space-based super-large-size three-dimensional multi-expandable thin film sunshade according to claim 4, characterized in that: After the circumferential expansion is completed, the sunshade receives a signal to start longitudinal expansion, the clamping device cuts off the clamping rope according to the command, and the motor inside the bottom plate of the longitudinal extension arm drives the screw to rotate, and the screw drives the expandable truss to expand step by step from the top; when the longitudinal extension arm assembly is expanded to the level where the wing-shaped partition of the longitudinal extension arm is located, it will drive the wing-shaped partition of the longitudinal extension arm to move upward together, and the wing-shaped partition of the longitudinal extension arm will drive the connected rib assembly to move; the four-layer ribs are expanded first, and the oblique hexagonal prism film is pulled out of the cavity of the three-layer ribs in an orderly manner; when the longitudinal extension arm assembly is expanded to the three-layer When the ribs are at the level where the second-layer longitudinal extension arm is located, the wing-shaped partition of the second-layer longitudinal extension arm begins to move, driving the second-layer ribs to move upward; at this time, the membrane in the cavity of the third-layer ribs has been fully expanded, and the third-layer ribs begin to pull the membrane out of the cavity of the second-layer ribs; when the longitudinal extension arm assembly is expanded to the level where the second-layer ribs are located, the second-layer ribs pull the membrane out of the cavity of the first-layer ribs; the first-layer ribs remain stationary during the longitudinal expansion process; finally, when all the longitudinal extension arm assemblies are fully expanded, all the rib assemblies are also synchronously in place, and the membrane in the cavity has been fully expanded to form a beveled hexagonal side.

6. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 1, characterized in that: The rib assembly is W-shaped when folded, and part of it penetrates into the interior of the sunshade cabin, and is fixed to the bottom plate of the sunshade cabin by the rib clamping assembly.

7. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 6, characterized in that: There is a hinge at each corner point of the W shape. Through the locking angle design of the hinge, when the circumferential deployment mechanism is fully deployed, the hinge inside the rib assembly can be locked synchronously.

8. The space-based super-large-size three-dimensional multi-expandable thin film sunshade according to claim 6, characterized in that: When the W-shaped rib assembly is unfolded into a straight line, a circumferentially expandable film in the cavity at the bottom of the rib is pulled out in an orderly manner, eventually forming a hexagonal shape.

9. The space-based super-large-size three-dimensional multiple-expandable thin film sunshade according to claim 1, characterized in that: The side of the light shield cabin board of the light shield cabin facing the longitudinal extension arm assembly is connected and pressed by the longitudinal extension arm pressing assembly with the light shield cabin board.

10. The space-based super-large-size three-dimensional multi-expandable thin film sunshade according to claim 1, characterized in that: The rib assembly is connected to the longitudinal extension arm assembly through the A flange of the longitudinal extension arm assembly, and the A flange is installed on the longitudinal extension arm bottom plate of the longitudinal extension arm assembly and the longitudinal extension arm wing-shaped partition plate.

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