Parabolic cylinder deployable mechanism composed of deployable units

Abstract

A parabolic cylinder deployable mechanism composed of deployable units is formed by combining a plurality of deployable units; each deployable unit comprises a first isosceles trapezoid piece, a second isosceles trapezoid piece, a first right trapezoid piece, a second right trapezoid piece, a third isosceles trapezoid piece, a fourth isosceles trapezoid piece, a first rectangular piece, a second rectangular piece, a first hinge, a second hinge, a third hinge and a fourth hinge; the two deployable units form the one-layer parabolic cylinder deployable mechanism in a manner of sharing a component, and the sharing component comprises the first isosceles trapezoid piece and the second isosceles trapezoid piece; the plurality of parabolic cylinder deployable mechanisms with the layer number of 1 are sequentially connected through a fifth hinge to obtain the parabolic cylinder deployable mechanism; and the parabolic cylinder deployable mechanism has the advantages of single-degree-of-freedom movement, large folding and unfolding ratio, good mechanism rigidity, stable unfolding and folding processes and good practicability.

Description

technical field [0001] The invention relates to the field of expandable mechanisms, in particular to a parabolic cylindrical expandable mechanism composed of expandable units. Background technique [0002] The expandable mechanism first appeared in the 1960s as a new type of space structure, which can be unfolded when in use and folded when not in use. In the folded state, the structure is gathered in a certain shape, and under the action of external driving force, the structure is gradually unfolded, reaching the fully unfolded working state, and then locked into a stable state. In recent years, deployable mechanisms have been used in various engineering fields, from umbrellas and retractable roofs to space station deployable antennas and spacecraft solar panels. The expandable mechanism usually adopts a modular design, that is, the mechanism can be obtained through an array of expandable modules, and this expandable module is called an expandable unit. [0003] There are...

AI Technical Summary

Problems solved by technology

[0005] 1. The expandable units in the prior art are often obtained by hinged rods at both ends. The overall rigidity of the expandable mechanism formed by the combination of the expandable units is poor. If the rigidity is increased by increasing the size of the rods and hinges, it will lose Part of the folding ratio and portability limit the practicability of the mechanism

[0006] 2. Extensible mechanisms in the prior art often require multiple deployment steps, and the deployment and folding process is cumbersome

[0007] 3. The expandable units in the prior art are often obtained by connecting more rods. Although they can achieve a large folding-expanding ratio, they are prone to misfolding

[0008] 4. The deployable units in the prior art are often connected by a rod, and the structure and function of the deployable mechanism obtained by combining them are relatively single and weakened

[0009] 5. When the expandable unit in the prior art is stored, the rods are often scattered, resulting in insufficient space utilization and poor storage

[0010] 6. The expandable units in the prior art are often obtained by combining straight rods, and it is not easy to combine them into a developable curved surface

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