Rope-driven umbrella-shaped Cassegrain antenna main and auxiliary surface stable unfolding mechanism

Abstract

The invention relates to a rope-driven umbrella-shaped Cassegrain antenna main and auxiliary surface stable unfolding mechanism. The mechanism comprises a central hub, radiation ribs, a feed source horn, an auxiliary surface, a spring, a main surface rope, an auxiliary surface rope and a winding mechanism, and the central hub is a fixed component; one end of each radiation rib is hinged with the central hub; the feed source horn and the center hub are coaxially and fixedly connected to the upper surface of the interior of the center hub; the secondary surface is coaxially connected with the feed source horn; the spring sleeves the feed source horn, is in contact with the bottom of the auxiliary surface and pops up the auxiliary surface when the antenna is unfolded; the main surface rope penetrates through the slots of the radiation ribs and the holes in the side surface of the central hub, and two ends of the main surface rope are fixedly connected with the radiation ribs and the auxiliary surface respectively; the auxiliary face rope penetrates through the hole in the bottom face of the center hub, and the two ends of the auxiliary face rope are fixedly connected with the auxiliary face and the winding mechanism. According to the invention, the unfolding process is stable, the impact on the antenna is small, the radiation ribs are unfolded while the auxiliary surface is unfolded, the unfolding synchronism of the antenna is good, and the antenna can be folded automatically for multiple times.

Description

technical field [0001] The invention belongs to the technical field of space-borne antennas, and in particular relates to a mechanism for stably deploying the primary and secondary surfaces of an umbrella-shaped Cassegrain antenna driven by a cable. Background technique [0002] The space-borne deployable antenna is an important part of the satellite structure. It refers to the antenna that is folded and stored in the fairing during launch, and once it reaches the predetermined position, it will automatically unfold to form a working state shape. Due to the limitation of rocket caliber, large-diameter satellite antennas cannot be directly transported into space. Therefore, how to fold satellite antennas to minimize their volume so that they can be transported by rockets has become a very urgent problem to be solved. [0003] At present, the more mature spaceborne deployable antennas, such as fixed surface, inflatable, frame and surrounding truss, are difficult to meet the re...

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Problems solved by technology

[0004] However, the umbrella-shaped deployable antenna has two large impacts, namely the moment when the secondary surface is fully deployed and the moment when the radiation ribs are fully deployed, and the synchronization of the radiation ribs is poor when they are deployed, and it is impossible to ensure that each radiation rib is deployed at the same time. It cannot be automatically folded after launch, that is, it cannot be expanded again after launch

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