Folding type six-rod mechanism

Abstract

The invention discloses a folding type six-rod mechanism which comprises six connecting rods in the same length and six rotary pairs and has three symmetrical surfaces and only one degree of freedom. In the movement process, the mechanism can be unfolded into a plane and folded into a compact bunch. According to the folding type six-rod mechanism, maximum folding and unfolding can be realized, the shape, after complete folding and unfolding, of the folding type six-rod mechanism can be regulated as needed when the mechanism is applied to the fields such as aerospace and civil engineering, the mechanism can be in an equilateral triangular shape or in any kind of equilateral hexagonal shape, the movement parameter variation range of the mechanism between the completely unfolding state and the completely folding state can be controlled, and the overconstrained property enables the rigidity and stability of the mechanism to be enhanced.

Description

technical field [0001] The invention relates to the field of mechanics, in particular to a foldable six-bar structural mechanism. Background technique [0002] The theoretical basis of this structure lies in a single closed-loop over-constrained mechanism. The over-constrained mechanism is a special mechanism with a history of one hundred years. There is a special geometric relationship between the connecting rods, which makes this kind of mechanism over-constrained, so it becomes a movable and single-degree-of-freedom mechanism. This mechanism is only connected by rotating pairs, which is simple to manufacture, low in cost and high in reliability. The geometric overconstraint makes it highly rigid. The first single-closed-loop single-degree-of-freedom constraint mechanism was discovered by Sarrus more than one hundred years ago, and later some other single-closed-loop single-degree-of-freedom constraint mechanisms were discovered and studied one after another. Professor ...

AI Technical Summary

Problems solved by technology

[0003] However, most of the current single-closed-loop, single-degree-of-freedom six-link over-constrained mechanisms cannot achieve full expansion. Only when the torsion angle of the connecting rods of the triple-symmetrical Bricard mechanism is 60 degrees can full expansion be achieved. After expansion, the shape cannot be adjusted and only It is an equilateral triangle, and can only be folded and unfolded when the motion parameters reach a certain value, which is not very practical

The use of folding structures or mechanisms in the industry is to realize the change of volume or coverage area. It is obvious that the ordinary six-bar linkage mechanism and the triple symmetrical Bricard mechanism that cannot be fully folded can not perform this function well.

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