Two-dimensional unfolding mechanism for large-aperture flexible thin-film antenna in space

CN117791080BActive Publication Date: 2026-10-16NANJING RES INST OF ELECTRONICS TECH
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Patent Information

Application Number
CN202311868015.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-31
Publication Date
2026-10-16
Estimated Expiration
2043-12-31

AI Technical Summary

Technical Problem

[0004]总之，现有专利及论文大多仅对柔性天线展开机构中的部分需求提出了解决方案，且均存在一定的风险和局限，当前缺少一种全局考虑高收展比、高可靠展开和展开后张紧力动态调节的机构方案

Benefits of technology

[0014] Compared to existing technologies, the advantages of this invention are as follows: The arc-shaped springs between the multi-stage support rods of this invention can act as flexible hinges during folding, provide gradually decreasing torque during unfolding, and improve support stiffness after unfolding. It also boasts advantages such as simple structure, light weight, low impact, and easy adjustment. A pre-existing gap between the linear nut and the shape memory alloy spring prevents disturbance of the shape memory alloy spring during the large-stroke unfolding of the thin-film antenna, while also shortening the adjustment stroke of the shape memory alloy spring, reducing cost and manufacturing difficulty. The length and output force of the spring are adjusted by changing the electrical signal applied to the shape memory alloy spring. The length and tension of the tension rope wound on the screw drum are controlled in real time via a ball screw-nut mechanism, improving the flatness and accuracy of the antenna.

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Abstract

The application discloses a two-dimensional unfolding mechanism for a large-aperture flexible thin film antenna in space, which comprises a box body, the box body is a hollow thin-walled regular octagonal center-symmetrical barrel structure, the central axis is coaxial with a circular thin film antenna after unfolding, a tension adjusting mechanism is arranged at the bottom of the box body, a plurality of support rods are arranged outside the box body, one end of a tension rope is fixed on the tension adjusting mechanism, the other end of the tension rope passes through the plurality of support rods and is connected to the circular thin film antenna, the tension adjusting mechanism, the plurality of support rods and the tension rope are eight groups in total and are distributed in a center-symmetrical manner relative to the regular octagonal box body. The plurality of support rods are connected by arc-shaped band springs with adjustable spacing, the arc-shaped band springs provide an unfolding moment and keep the rigidity of the support rods after unfolding. A shape memory alloy column spring is driven by an electric signal to adjust axial output, the length and tension of the tension rope wound on a screw rod drum are adjusted through a ball screw-nut mechanism, the folding of the thin film antenna is inhibited, the flatness and precision are ensured.
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