High-folding-unfolding-ratio double-layer annular unfoldable antenna mechanism based on straight quadrangular units

Abstract

The invention provides a high-folding-unfolding-ratio double-layer annular unfoldable antenna mechanism based on straight quadrangular units. The high-folding-unfolding-ratio double-layer annular deployable antenna mechanism comprises a plurality of same straight quadrangular units, each straight quadrangular unit is formed by fixedly connecting an upper-layer unfoldable module and a lower-layer unfoldable module which are in mirror symmetry through four connecting rods, and the plurality of adjacent straight quadrangular units are networked; every two adjacent straight quadrangular units share a first faceplate, a first connecting block and a first connecting rod. The sequential connection lines of the central points of all the first connecting rods form a regular polygon, and a third faceplate and a fourth faceplate on the same layer of every two adjacent straight quadrangular units are connected through a series chain comprising three parallel revolute pairs and two equal-length rods. The mechanism has the beneficial effects that joint parts are connected through revolute pairs, so that the cold welding phenomenon of the mechanism during the moving process is reduced; the straight quadrangular units have the advantages of being high in stability, large in folding-unfolding ratio and high in rigidity and being easy to assemble.

Description

technical field [0001] The invention relates to the technical field of extendable antennas, in particular to a double-layer ring-shaped extendable antenna mechanism with a high fold-to-expand ratio based on a right quadrangular prism unit. Background technique [0002] With the development of aerospace technology, the technical requirements for aerospace deployable antennas are getting higher and higher, and the requirements for the application types of deployable antennas are becoming more and more complex. The space deployable antenna is a new type of space structure produced with the rapid development of aerospace technology in the past 20 to 30 years. International research institutions, various universities and private aerospace companies have studied it. Among them, the large-scale space-borne deployable antenna is considered by many researchers to be an ideal form of aerospace deployable structure due to its characteristics of large aperture, light weight, high precis...

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Problems solved by technology

[0005] Chinese patent (CN 110085964 A) discloses a mesh loop deployable antenna and antenna truss, and Chinese patent (CN 109687091 A) discloses a pyramid element array ring truss deployable antenna mechanism, which all belong to a single-layer ring structure. The disadvantages are small rigidity, poor stability, large elasticity and poor reliability when the mechanism is deployed;

[0006] Chinese patent (CN 109659661 A) discloses a cable-rod tensioning ring-type deployable antenna mechanism, and Chinese patent (CN 109659659 A) discloses a ring-shaped truss-type deployable antenna mechanism based on 3R-RRP mechanism units. The disadvantage is that the deployable antenna is easy to be cold-welded in the low-temperature environment in space, so that the entire deployable antenna cannot be effectively deployed;

[0007] Chinese patent (CN 106025484 B) discloses a scissor linkage type double-layer annular truss deployable antenna mechanism, and Chinese patent (CN 108281747 A) discloses a scissor linkage type over-constraint double-layer annular truss expandable antenna mechanism. Their disadvantages are The use of space over-constrained scissor-fork mechanism makes assembly difficult and prone to local stress concentration; in addition, the space scissor-fork mechanism easily interferes with the rods when folding, resulting in a limited folding-expanding ratio

[0008] Chinese patent (CN 105071012 B) discloses a space-expandable annular tension integral antenna mechanism, and Chinese patent (CN 106785306 B) discloses a rope-driven scissors truss structure. Their disadvantage is that there are multiple degrees of freedom, which cannot effectively ensure the entire The mechanism can be deployed synchronously, which leads to the failure of the mechanism deployment and complicated control, which leads to a very high manufacturing cost of the entire antenna;

[0009] Chinese patent (CN 106586037 A) discloses a repeatable telescopic frame-type telescopic mechanism, which belongs to a linear motion mechanism, which can only realize folding in one direction, but cannot realize circumferential folding, and the folding range in space is limited

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