Single-excitation ultrasonic oval vibration energy converter

Abstract

The invention discloses a single-excitation ultrasonic oval vibration energy converter. The single-excitation ultrasonic oval vibration energy converter comprises an ultrasonic vibration energy converter and an oval vibration mode converter, wherein the ultrasonic vibration energy converter comprises bolts and a rear cover plate, a piezoelectric ceramic piece, an electrode slice and a front cover plate all of which are arranged on the bolt in a sleeved manner and in order, wherein the rear cover plate and the front cover plate connect and tightly compress the rear cover plate, the piezoelectric ceramic piece, the electrode sheet and the front cover plate through the bolts; the oval vibration mode converter is arranged in the front end of the front cover plate and is of an oblique wedged structure; the oval vibration mode converter can convert lengthways ultrasonic vibration generated by the ultrasonic vibration energy converter to lengthways bent composite ultrasonic oval vibration at the terminal end of the oval vibration mode converter. By the adoption of a sandwich type structure, the single-excitation ultrasonic oval vibration energy converter has the advantages of a big power capacity, a simple structure, great rigidity of partial structure of the oval vibration mode converter, high energy conversion efficiency, steady work performances and the like.

Description

technical field [0001] The invention relates to the field of ultrasonic vibration utilizing the inverse piezoelectric effect of piezoelectric ceramics, in particular to a single excitation ultrasonic elliptical vibration transducer. Background technique [0002] Ultrasonic elliptical vibration is widely used in the fields of ultrasonic vibration cutting, ultrasonic welding, ultrasonic grinding, ultrasonic polishing, linear ultrasonic motor and rotary ultrasonic motor. At present, most researchers use two vibration forms of longitudinal vibration, torsional vibration, bending vibration and radial vibration to combine to generate ultrasonic elliptical vibration. If there are two or more vibration modes, each group of piezoelectric ceramic sheets must be equipped with an ultrasonic drive power signal, and the phase difference between the ultrasonic drive power signals needs to be controlled. The structure of the ultrasonic vibration system and control system is complex. , diff...

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Problems solved by technology

At present, most researchers use two vibration forms of longitudinal vibration, torsional vibration, bending vibration and radial vibration to combine to generate ultrasonic elliptical vibration. If there are two or more vibration modes, each group of piezoelectric ceramic sheets must be equipped with an ultrasonic drive power signal, and the phase difference between the ultrasonic drive power signals needs to be controlled. The structure of the ultrasonic vibration system and control system is complex. , high manufacturing difficulty, high control difficulty, high production cost, difficult miniaturization, and unstable working performance, these problems restrict the application and promotion of ultrasonic elliptical vibration transducers in industrial production

[0003] In order to overcome the deficiencies in the above-mentioned ultrasonic elliptical vibration transducer technology, the paper "Elliptic Vibration Cutting Transducer Based on Finite Element Analysis" of "Journal of Beijing University of Aeronautics and Astronautics" in February 2005, Volume 31, No. 2, proposed a An ultrasonic elliptical vibration cutting transducer with an asymmetric structure excited by a single electric signal, and the finite element dynamic analysis and experimental research on the transducer have achieved good experimental results, but it is necessary to further increase the longitudinal vibration to The conversion of bending vibration, increasing the ratio of the short axis to the long axis of the elliptical vibration track, and improving the cutting effect, it is not ideal to only rely on adding mass blocks and tools on the front end side of the horn, and from the horn to the additional mass Two physical connections are required between the block and the additional mass block to the tool, resulting in a large loss of ultrasonic vibration energy from the piezoelectric transducer to the tool, which affects the cutting effect of ultrasonic elliptical vibration

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