Two-stage micro-displacement amplification mechanism

Abstract

The invention discloses a two-stage micro-displacement amplification mechanism which is characterized in that two triangle displacement zooms are arranged and respectively are a first stage triangle displacement zoom and a second stage triangle displacement zoom, each triangle displacement zoom comprises four sloping sides; the input end of the first stage triangle displacement zoom is linked with a driven element; the output end of the first stage triangle displacement zoom is linked with the input end of the second stage triangle displacement zoom. In the optimized scheme, flexibility hinges are respectively arranged at the joint of the displacement input end and the four sloping sides of the triangle displacement zoom and the joint of the displacement output end and the four sloping sides; the displacement input end of each triangle displacement zoom is provided with a positioning step. Two-stage micro-displacement amplification mechanism provided with by the invention has the advantages of zero friction, zero clearance and zero delay, and is easy to maintenance and service; the mechanism avoids oversized elastic counterforce caused by structural distortion, ensures direction stabilization of the displacement output; the displacement enlargement ratio of the two-stage displacement amplification is greatly improved, and the mechanism has very high practicability.

Description

technical field [0001] The invention relates to a micro-displacement amplification mechanism, which belongs to the field of mechanical quantity precision drive, and is suitable for the frictionless and hysteresis-free amplification of the output displacement of the micro-displacement drive mechanism, especially for the micro-displacement of intelligent micro-displacement drive elements such as piezoelectric and magnetic output amplification. Background technique [0002] Micro-displacement driving components, such as those based on intelligent materials such as piezoelectric and magnetostrictive, are widely used in mechanical and electronic fields such as instruments and precision machine tools because of their superior precision driving and positioning performance. However, this type of driving element can only provide micron-level working strokes, which often cannot meet the needs of practical applications. In order to overcome this shortcoming, a displacement amplificati...

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Problems solved by technology

[0003] The structure of this micro-displacement amplification mechanism based on a lever mechanism can reduce the problem of excessive reaction force by using a sheet-shaped flexible hinge, but it also causes difficulties in predicting the structural reaction force and the nonlinearity of the displacement amplification ratio.

When the target displacement is too large, it is difficult for the mechanism to obtain a fixed ratio of amplified output displacement, and due to the asymmetry of the structure, the output point will shift its position, making it difficult to accurately achieve the target action

[0004] image 3 It shows another commonly used symmetric micro-displacement amplification mechanism based on the principle of elastic deformation, but the design of this amplification mechanism does not have hinges at the input and output connections, so it cannot avoid large structural deformation reaction force (the reaction force increases with the displacement Large nonlinear and sharp increase), and the displacement magnification that can be achieved by simply using the principle of the mechanism is limited, generally not more than 4

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