Squeezed micro-displacement actuator of magnetorheological elastomer

Abstract

The invention relates to a squeezed micro-displacement actuator of a magnetorheological elastomer and belongs to the field of precision mechanical devices. The actuator comprises a lower shell, a lower magnetizer, the magnetorheological elastomer, a magnet exciting coil, an upper magnetizer, a squeezing disc, an output rod, a linear bearing, a fixing flange, a pre-tightening mechanism and an upper shell. In the actuator, the output rod is used as micro-displacement output; one end of the output rod is connected with the magnetorheological elastomer through the squeezing disc while the other end of the output rod is positioned by the linear bearing; and the pre-tightening mechanism is used for applying a tightening force to the top end of the output rod. The tightening force is applied at working hours so that the magnetorheological elastomer is initially deformed, and the elastic modulus of the magnetorheological elastomer is changed through controlling a magnetic field after electrification, namely, the displacement at the end part of the output rod is changed, so that the purpose of micro-displacement output is achieved. The micro-displacement actuator provided by the invention has the advantages of large and adjustable stroke and simple structure, and can meet the requirement of micro-nano resolution.

Description

technical field [0001] The invention relates to a precision mechanical device, in particular to a micro-displacement actuator based on an intelligent material magneto-rheological elastomer, which is suitable for the focusing mechanism of astronomical telescopes, active optical mirror surface control, and ultra-finishing industries that require millimeters High-resolution precision motion drive on the stage stroke. Background technique [0002] Precision measurement and microscale actuation have broad applications in many fields, especially in optics. The optical system of an astronomical telescope generally includes optical components such as a primary mirror and a secondary mirror. The deflection caused by gravity changes at different pitch angle positions, so the secondary mirror of the telescope generally requires the ability to automatically adjust on a small scale to adapt to the change of the distance between the primary and secondary mirrors. In addition, the thin m...

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Problems solved by technology

[0004] In order to solve the problems of small stroke, non-adjustable stroke, complex structure, and low resolution of micro-displacement in the prior art, the present invention proposes an intelligent material magneto-rheological elastomer as a variable stiffness element to achieve large-stroke high-resolution micro displacement actuator

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