U-shaped stepping piezoelectric actuator and method based on diamond ring wedge integrated clamp

Abstract

Disclosed is a U-shaped stepping piezoelectric actuator based on an integrative clamping of diamond ring wedges and a method thereof, and the actuator comprises a shell, a u-shaped rod piece which cooperates with the shell through a guide rail, as well as an integrative clamping structure of diamond ring wedges which is fixedly arranged on the center of the shell through a rectangular section beam. Near the bottom of the output base plane, a long pole on the left side of the u-shaped rod piece is embedded a diamond-shaped driving mechanism, wherein the diamond-shaped driving mechanism is provided with a driving piezoelectric stack through the interference fit. The rectangular section beam is arranged on the vertical symmetry axis of the integrative clamping of diamond ring wedges, a clamping diamond ring provided with a clamping piezoelectric stack through the interference fit is provided with the rectangular section beam on one side, and an integrative wedge on the other side, wherein the wedge is capable of contacting closely with the wedge surface inside the u-shaped rod piece. The U-shaped stepping piezoelectric actuator based on integrative clamping of diamond ring wedges adopts a u-shaped folding output device, effectively reducing the structure size and improving the utility rate of space. The critical components of the actuator adopt the processing technology of low speed wire cutting, which has high precision, large tolerance of wearing of clamping structure, and the function of lock up after power off.

Description

technical field [0001] The invention belongs to the technical field of stepping piezoelectric actuators, and in particular relates to a U-shaped stepping piezoelectric actuator and an actuating method based on integrated clamping of rhombic ring wedges. Background technique [0002] The working principle of piezoelectric drive is based on the inverse piezoelectric effect of piezoelectricity, which has the advantages of good linearity, convenient control, high displacement resolution, good frequency response, no noise, no electromagnetic interference, low voltage drive and easy miniaturization . Piezoelectric actuators have a wide range of application backgrounds in many key technological fields such as aerospace technology, optics, adaptive smart structures, active vibration suppression, and ultra-precision micromachining. [0003] The stepping piezoelectric actuator imitates the crawling mode of natural inchworms, and through the accumulation of small step displacements of...

AI Technical Summary

Problems solved by technology

However, the previous stepping actuators often adopt a symmetrical structure, and the length of the output rod will increase the axial dimension of the actuator, resulting in a significant decrease in lateral stiffness, which limits the use of occasions.

[0004] In addition, for the traditional active clamp type stepper driver driven by static friction, the friction force is determined by the normal force and the friction coefficient, while a very small gap between the friction surfaces is required, which is affected by the environment, such as thermal expansion, pollution, corrosion and wear The impact is severe, often unable to work for a long time

[0005] Finally, the previous stepping piezoelectric actuators mostly used the power-on clamping method, and in the application where the system is required to maintain the output displacement even when the system is powered off, the previous actuators could not complete such tasks

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