A piezoelectric ceramic driver preloading device

Abstract

The invention discloses a piezoelectric ceramic driver pretensioning device. A threaded column is rotatably arranged on a base, and the threaded column and the piezoelectric ceramic driver are arranged in the same direction, and one end of the threaded column can lean against the end of the piezoelectric ceramic driver; The column is driven by a worm gear, and the thread of the worm wheel is set outside the threaded column; the worm and the thread of the worm wheel cooperate to form a worm gear mechanism. When the worm rotates, it drives the worm wheel to rotate. The axial position remains fixed, and the worm gear and the threaded column are screwed together. When it is necessary to tighten, turn the worm to make the threaded column close to the piezoelectric ceramic driver. One end of the piezoelectric ceramic driver is in contact with the threaded column, and the other end is in contact with the working mechanism. Contact, apply pressure through the threaded column, so that the piezoelectric ceramic driver and the working mechanism fit closely; the worm gear mechanism has self-locking characteristics, and the worm gear can only be driven by the worm gear, and the worm gear cannot reversely drive the worm gear to rotate, eliminating the possibility of loosening .

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, and further relates to a pretensioning device for a piezoelectric ceramic driver. Background technique [0002] In the field of micro-nano precision machining, there are more and more applications of stacked piezoelectric ceramic drivers. Stacked piezoelectric ceramics have the characteristics of high displacement accuracy, resolution can reach nanometer level, and thrust is large, up to 1000N. The stroke of the electroceramic actuator is very small, generally only a few tens to a hundred microns, and it is often combined with a flexible structure to work. [0003] When the driver is placed outside and the flexible hinge is pushed externally, the driver may not be close to the flexible hinge, and there is a gap. The driver outputs displacement, but the displacement is not transmitted to the flexible hinge, resulting in an input dead zone. [0004] The commonly used method is to se...

AI Technical Summary

Problems solved by technology

[0003] When the driver is installed externally and the flexible hinge is pushed externally, the driver may not be close to the flexible hinge, there is a gap, the driver output displacement, but the displacement is not transmitted to the flexible hinge, resulting in an input dead zone

[0004] The common method is to set a fastening screw behind the piezoelectric ceramic driver to tighten it, but the working thrust of piezoelectric ceramics is large, and the screw will be loosened after working for a period of time, losing the original tightening effect

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