A Multistage Passive Bending Mechanism Based on Variable Cross-section Cross Reeds

Abstract

The invention relates to a multi-stage passive bending mechanism based on cross-section reeds with variable cross-sections. Two reeds with variable cross-sections of equal length are symmetrically cross-connected along the length direction of two adjacent arc-surface free ends to form one stage. The cross-section of a reed is thinnest at the intersection and thickest at the point where it joins the free end. In the free end of the arc surface of this scheme, the intersection point of the cross reed and the unit of the cross reed overlap with the center of the outer free end of the entire bending mechanism, so that the offset of the intersection point of each cross reed unit during passive bending deformation is The lower the deformation, the higher the deformation accuracy. The cross-section reed unit with variable cross-section is adopted, that is, the section of each reed is the thinnest at the intersection and the thickest at the part connected to the free end, which enables a large passive deformation to be achieved while ensuring the deformation accuracy, and at the same Under the deformation degree of , the deformation accuracy of the cross-reed unit described in this scheme is higher.

Description

technical field [0001] The invention belongs to the field of multi-stage passive bending mechanisms, and relates to a multi-stage passive bending mechanism based on cross reeds with variable cross sections, and a mechanical mechanism for realizing multi-stage bending deformation under the action of external force. Background technique [0002] The passive bending mechanism is a mechanism that produces bending deformation under the action of external force. It is a very common mechanical structure, such as the springboard of a diver and the bow of a bow and arrow. The traditional passive bending deformation mechanism is generally similar to a simple cantilever beam, or a mechanism connected by a slewing mechanism with friction, which has great limitations in deformation. For a bending mechanism similar to a cantilever beam, because it is a single-stage deformation structure, its deformation accuracy is low. For a mechanism connected by a slewing mechanism with friction, fric...

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Problems solved by technology

The passive bending mechanism used in the article "Experimental Research on SMA Wire-Driven Bionic Tail Fin Propeller" in Volume 41, No. 7, 2013 of Micro-Special Motors is SMA wire. Since it bears active deformation at the same time, its passive deformation is affected by The restriction of active deformation cannot achieve the maximum passive deformation effect of bionic fish

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