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Expandable thin film light shield

A sunshade and deployable technology, which is applied in the field of sunshade, can solve the problems of complex inflation system, insufficient rigidity, and heavy weight of the sunshade, and achieve the effect of simple and reliable driving mode, satisfying shading and shape dimension, and light weight

Active Publication Date: 2021-02-19
BEIJING INST OF SPACECRAFT SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sunshade is generally a rigid structure composed of carbon fiber honeycomb panels. The rigid sunshade cannot meet the requirements of transportation due to its large emission volume, excessive weight, and insufficient rigidity. The expandable film sunshade has light weight and large storage capacity. Compared with other advantages, it has been greatly valued
[0003] In 1995, JPL of the United States proposed an inflatable unfolding hood. The structure is designed as a beveled cylindrical surface with a diameter of 3.65m. Six layers of aluminum / Kapton film are deployed through 10 inflatable tubes of different heights along the axial direction around the periphery. And the light curing method is used to improve the rigidity of the structure; but the inflation system of the hood is relatively complicated, and the light curing effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a light-weight, large storage ratio, and large-scale expandable film shading cover with high rigidity in the unfolded state. When folded, the shading cover is pressed against the bottom frame, and after unfolding, it forms a diagonally cut polygonal body structure, which is suitable for Space optics satellite.

[0041] Such as Figure 1-Figure 3 As shown, the shading cover includes: an expandable skeleton, a light-shielding film 7 and a compression release device 8; wherein the expandable skeleton is used as the main support structure of the shading cover, which is directly related to the position accuracy, profile accuracy and basic structure of the shading cover after deployment. Frequency; the expandable skeleton includes: two sets of large connecting rod expansion mechanisms 1, two sets of small connecting rod expansion mechanisms 2, bottom frame 3, middle frame 4, upper frame 5 and linkage device 6; figure 1 In the unfolded state of the ho...

Embodiment 2

[0056] On the basis of Embodiment 1 above, the structure of the compression release device is further described in detail.

[0057] Such as Figure 7 It is a schematic diagram of compression state and release state of compression release device. The compression release device includes: a separation nut 16, a compression rod 17 and a separation spring 18; wherein the separation nut 16 is a pyrotechnic separation nut, which is fixed inside the compression seat by four screws, and the compression seat is arranged on the bottom frame 3; The position corresponding to the compression seat on the middle bulkhead frame 4 and the upper bulkhead frame 5 is provided with a mounting hole for the compression rod 17 to pass through; Screw and pre-tighten the threads of the separation nut 16. At this time, the compression rod 17 compresses the expandable skeleton. The separation spring 18 is set outside the compression rod 17. One end is in conflict with the frame 5, and the other end is co...

Embodiment 3

[0061] On the basis of the above-mentioned embodiment 1 or embodiment 2, the linkage sheave adopts a built-in design to avoid the extra lateral bending moment caused by the hinge due to the external linkage sheave; at the same time, the linkage rope adopts internal routing accordingly, through a The linkage rope is introduced into the inside of the connecting rod to the guide wheel (that is, the connecting rod adopts a hollow rod, and the linkage sheave is arranged inside the connecting rod, and correspondingly, the linkage rope is routed from the inside of the connecting rod). Compared with the external wiring, this wiring method can effectively eliminate the risk of the linkage rope being caught with other parts during the movement.

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Abstract

The invention provides an expandable thin-film light shield, and the light shield can meet the requirements of satellite-borne large loads for large-scale, light-weight and large-storage-ratio expandable thin-film light shields. The light shield comprises an expandable framework, a shading thin film and a pressing and releasing device, the expandable framework is of a beveled hexagonal prism structure as a whole and has the functions of folding and unfolding in the height direction. The shading film is of a beveled hexagonal prism structure and covers the outer surface of the expandable framework. When the expandable framework is folded or unfolded in the height direction, the shading film is driven to be unfolded or folded. The linkage device is used for synchronously unfolding or foldingthe large connecting rod unfolding mechanism and the small connecting rod unfolding mechanism; and the compressing and releasing device is used for compressing the expandable framework when the expandable framework is in the folded state, so that the expandable framework is kept in the folded state.

Description

technical field [0001] The invention relates to a shading cover, in particular to a large expandable film shading cover. Background technique [0002] With the continuous development of space exploration activities, the demand for large-aperture cameras in future space missions is increasing. The traditional sunshade is generally a rigid structure composed of carbon fiber honeycomb panels. The rigid sunshade cannot meet the requirements of transportation due to its large emission volume, excessive weight, and insufficient rigidity. The expandable film sunshade has light weight and large storage capacity. Great attention has been paid to such advantages. [0003] In 1995, JPL of the United States proposed an inflatable unfolding hood. The structure is designed as a beveled cylindrical surface with a diameter of 3.65m. Six layers of aluminum / Kapton film are deployed through 10 inflatable tubes of different heights along the axial direction around the periphery. The rigidity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B11/04
CPCG03B11/045
Inventor 林秋红从强邱慧董凯捷黎彪苏周蔡伟余快刘冬李潇赵震波
Owner BEIJING INST OF SPACECRAFT SYST ENG
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