Multi-support two-way piezoelectric rotary driving device

Abstract

The invention relates to a multi-support two-way piezoelectric rotary driving device, which comprises a base, a center rotating shaft, a first connecting plate, a second connecting plate, a first peripheral piezoelectric driving device and a second peripheral piezoelectric driving device, wherein the base is fixed; the center rotating shaft and the base are in gap matching to form a rotating pair;the peripheral piezoelectric driving devices are rotationally and symmetrically arranged on the periphery of the center rotating shaft through a connecting plate; alternating current voltage is exerted on two piezoelectric vibrators in the peripheral piezoelectric driving devices; the two foot support seats are driven to move; the foot support seats receive friction force opposite to the moving direction; materials with different friction coefficients on the foot support seats are promoted to be respectively in contact with the work surface; the directional moving of the piezoelectric drivingdevices can be realized; the center rotating shaft is driven to directionally rotate and to output torque. The two-way driving is realized. The multi-support two-way piezoelectric rotary driving device has the advantages that the structure is simple; the maintenance cost is low; the requirement on the work surface is low; the service life of piezoelectric ceramics in the driving devices can be prolonged.

Description

technical field [0001] The invention belongs to the field of piezoelectric drive, and in particular relates to a multi-support bidirectional piezoelectric rotary driver. Background technique [0002] The performance of the driver directly affects the performance of automation equipment. Due to the superior performance of piezoelectric drive components such as small size, fast response speed, high controllable precision, high energy conversion efficiency and no electromagnetic interference, it is widely used in ultra-precision instruments, micro robots, precision positioning and biomedical fields have been widely used. Piezoelectric drive is mainly divided into linear drive and rotary drive. Piezoelectric linear drive has made many achievements, while rotary drive has yet to be further studied. Existing rotary drives mainly include piezoelectric inertial drives and bionic drives. The bionic drives are mainly inchworm-like peristaltic drives. This driving method requires stac...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems that the structure of the current piezoelectric actuator is relatively complex, it is mostly in rigid contact with the working surface, the requirements for the working environment are high, and the easy-to-wear components are not easy to replace, a multi-support bidirectional piezoelectric rotary actuator is proposed, which consists of a base, a central shaft , a first connecting plate, a second connecting plate, a first circumferential piezoelectric driver and a second circumferential piezoelectric driver, wherein the base is a cylinder with a circular groove in the center and its position is fixed, and the central shaft It includes a positioning section, a driving section and an output section. The positioning section of the central rotating shaft is connected with the groove of the base to form a rotating pair. The central rotating shaft can rotate around its axis. The first connecting plate and the second connecting plate are Rectangular thin plate, the first circumferential piezoelectric driver and the second circumferential piezoelectric driver are arranged on both sides of the driving section of the central rotating shaft through the first connecting plate and the second connecting plate, respectively; The electric driver includes: a first piezoelectric vibrator, a second piezoelectric vibrator, a third piezoelectric vibrator, a first foot support, a second foot support, a third foot support and a fourth foot support; wherein the The first piezoelectric vibrator, the second piezoelectric vibrator and the third piezoelectric vibrator are all composed of piezoelectric sheet materials pasted on a rectangular elastic base, and the first piezoelectric vibrator, the second piezoelectric vibrator and the third piezoelectric vibrator connected in sequence, one end of the first leg support is arranged on the lower surface of the first piezoelectric vibrator, and the other end is a free end, and one end of the second leg support is connected between the first piezoelectric vibrator and the second piezoelectric vibrator The lower surface, the other end is a free end, one end of the third leg support is connected to the lower surface between the second piezoelectric vibrator and the third piezoelectric vibrator, and the other end is a free end, the fourth leg support One end is connected to the lower surface of the third piezoelectric vibrator, and the other end is a free end. The free end of the first foot support is composed of a first high friction coefficient material and a first low friction coefficient material with a semicircular cross section. If the structure, size and material of the second foot support, the third foot support and the fourth foot support are exactly the same as those of the first foot support, the materials with the same friction coefficient at the free ends of the four foot supports are arranged adjacent to each other; The structure of the second piezoelectric actuator is exactly the same as that of the first piezoelectric actuator, and the piezoelectric actuator is rotationally symmetrical about the central axis of rotation

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