U-shaped step piezoelectric actuator and method based on double-clamp plate power-off locking mechanism

Abstract

The invention provides a U-shaped stepping piezoelectric actuator and method based on a double-clamping-plate outage locking mechanism. The actuator comprises a shell, double clamping plates and a U-shaped rod, wherein two ends of each of the double clamping plates are fixedly connected with the shell; the U-shaped rod penetrates through clamping holes in the double clamping plates; the double clamping plates consist of an upper clamping plate and a lower clamping plate which are inverted to each other; two ends of each of the upper clamping plate and the lower clamping plate are fixedly connected with the shell; the structure of the upper clamping plate is the same as the structure of the lower clamping plate; a recessed arc, a recessed round slot, a clamping piezoelectric stack mounting position and a flexible hinge are arranged in each of the upper clamping plate and the lower clamping plate; during assembling, a small gap is reserved between the upper clamping plate and the lower clamping plate to reduce wear in an actuating process; the U-shaped rod comprises round rods on two sides, an arc-shaped output end and a rhombic driving mechanism, wherein the rhombic driving mechanism is inlaid in the lower part, which is close to the arc-shaped output end, of the round rod on the left side, and the driving piezoelectric stack is in interference fit to the inside of the rhombic driving mechanism. The actuator is provided with a U-shaped output device, the structure size is reduced effectively, the clamping plates are processed by low speed wire cutting process, the precision is high, and moreover, the clamping plates have displacement enlargement and outage locking functions, and are reliable in clamping.

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 a double-clamping plate power-off locking mechanism. 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 displac...

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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