A Large Stroke Actuator Driven by Piezoelectric Ceramics

Abstract

The invention discloses a large-stroke actuator based on piezoelectric ceramic driving and belongs to the technical field of actuators, which matches the work by arranging a piezoelectric ceramic pile, a slider and a stroke amplifying unit and drives the slider to move based on the reverse piezoelectric effect of a piezoelectric ceramic body; then, the movement of the slider is converted into a relative rotation of two connecting rods in the stroke amplifying unit; after that, the stroke of the slider is amplified and transmitted to an inserting-pulling member through a stroke amplifying mechanism to complete inserting / pulling process of the inserting-pulling member. The actuator in the invention is simple in structure, easy to set; the sliding stroke of the slider can be greatly enlargedthrough the stroke amplifying mechanism; the whole process is simple in control, strong in recoverability and high in precision; the change of the stroke driving distance of the actuator can be realized by changing the setting number of the stroke amplifying unit and / or the sliding distance of the slider, thereby greatly improving the compatibility of the actuator, achieving large stroke control of the actuator, and having a good promotion and application value.

Description

technical field [0001] The invention belongs to the related technical field of actuators, and in particular relates to a large-stroke actuator driven by piezoelectric ceramics. Background technique [0002] As a stroke control mechanism, actuators have been widely used in many fields, such as electromechanical systems and weapon systems; with the continuous development of modern industry and science and technology, more and more requirements have been put forward for the performance of actuators. The requirements make it continue to develop in the direction of miniaturization, large stroke, and high response speed. [0003] In the existing technology, most of the traditional actuators are based on electromagnetic or direct drive of gunpowder to complete the actuation process. Among them, the electromagnetic drive actuator is mainly composed of armature, yoke, wire package assembly, spring, pin, etc. A magnetic field is generated after the wire package assembly is energized ...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, most of the traditional actuators are based on electromagnetic or gunpowder direct drive to complete the actuation process. Among them, the electromagnetic-driven actuator is mainly composed of armature, yoke, wire package assembly, spring, pin, etc. , the magnetic field is generated after the wire package assembly is energized to magnetize the armature and the yoke made of soft magnetic materials, the magnetic force of the armature and the yoke overcomes the spring resistance, the movement of the armature drives the pin to move, and then completes the actuation process of the actuator. The structure often has problems such as small driving force and short driving stroke; while the gunpowder-driven actuator mainly uses the gas generated by the combustion of the gunpowder to drive the piston to do work, and the piston drives the pin to move to complete the actuation process of the actuator. However, affected by factors such as structure, gas pressure transmission direction and sealing, propellant actuators often have problems such as low reliability, low energy conversion efficiency, and poor safety in practical applications, and propellant-driven actuators are often one-time drives. , that is, the drive of the actuator is non-recoverable, so its application range is often limited, and it cannot be effectively applied to the application environment that requires cyclic drive, which has great limitations

[0004] In the field of actuator technology, piezoelectric ceramics have the advantages of high response frequency, large driving force, and good linearity, but their output displacement is small, which cannot fully meet the motion requirements of various actuators in many applications, so its The application also has certain limitations and cannot be effectively applied to large-stroke actuators

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