Stepping piezoelectric actuator with wedge-shaped half-ring power-off locking mechanism and its actuating method

Abstract

The invention relates to a stepping piezoelectric actuator containing a wedge-shaped semi-ring power-off locking mechanism and an actuating method. The actuator comprises an end cover, a shell, press springs, wedge-shaped semi-rings, piezoelectric rings, a diamond-shaped driving mechanism, a driving piezoelectric pile and output rods, wherein a left clamping mechanism and a right clamping mechanism are symmetrically arranged in the shell of the actuator, one end of the left clamping mechanism is used for pressing the press spring at the inner side of the end cover and in a compression state, the other end of the press spring is in close contact with large end surfaces of the two wedge-shaped semi-rings arranged oppositely, the inclined outer surfaces of the two wedge-shaped semi-rings are in close contact with the inclined inner surface of the shell, one side of each piezoelectric ring is in contact with a small end surface of one corresponding wedge-shaped semi-ring, the other sides of the piezoelectric rings are fixed on the surface of a boss in the shell, the structure of the right clamping mechanism is the same as the structure of the right clamping mechanism, the driving mechanism is arranged between the left clamping mechanism and the right clamping mechanism, the driving piezoelectric pile is in interference fit with the interior of the diamond driving mechanism, and the output rods are separately connected with the left end and the right end of the driving mechanism. The actuator has the characteristics of simplicity in structure, high abrasion tolerance, power-off locking and reliability in clamping, and is convenient to assemble.

Description

technical field [0001] The invention belongs to the technical field of stepping piezoelectric actuators, and in particular relates to a stepping piezoelectric actuator with a wedge-shaped half-ring power-off locking mechanism and an actuating method. 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 th...

AI Technical Summary

Problems solved by technology

However, the crawling method used in the past stepping actuators requires three piezoelectric elements that cooperate with each other to move together, so its structure is relatively heavy under high-frequency driving conditions, and it cannot be driven at higher frequencies, thus limiting the actuation The rate at which the device shifts the output

[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

Images