A High Precision Screwdriver Based on Piezoelectric Stack

Abstract

The invention relates to a high-precision screwdriver based on piezoelectric stacks, and belongs to a screw tightening tool. The high-precision screwdriver comprises screwdriver head slots, screws, sealing rings, sliding bearings, screw sleeves, piezoelectric stack electrodes, piezoelectric stacks, thrust bearings, a mass block, a screwdriver housing and a reset spring. The high-precision screwdriver disclosed by the invention adopts the piezoelectric stacks as driving sources; the piezoelectric stacks are precision driving elements; the output displacement and the output stress of the piezoelectric stacks are controlled by the voltage applied on the piezoelectric stack electrodes; the high-precision screwdriver uses the piezoelectric stacks as the driving sources, utilizes the inverse piezoelectric effect and the high-resolution output displacement at the micron level of the piezoelectric stacks, and changes the voltage applied to the piezoelectric stack electrodes so as to control the output displacement and the output stress of the piezoelectric stacks; the screw has high-resolution displacement output and high-precision controlled output stress; and high-precision control of the screwed-in depth of the screwdriver head is achieved, and the control accuracy of the screwing force of the screwdriver is improved.

Description

technical field [0001] The invention relates to a high-precision screwdriver based on a piezoelectric stack, which belongs to a screw tightening tool. Background technique [0002] In real life, a screwdriver is very common and applicable, a tool that turns a screw to force it into or out of place. Due to its functional characteristics, it is widely used in the fields of electronic appliances, micro-machines, computers, micro-components, etc. With the rapid development of science and technology, the installation accuracy of components is getting higher and higher, and the control of screwdriver bit screwing depth and screwdriver torque control precision is getting higher and higher. Therefore, how to improve the control precision of screwdriver bit screw-in depth and the control precision of screwdriver twisting force has become an important development direction of screwdriver. [0003] At present, there are many types of screwdrivers at home and abroad. The main screwdri...

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Problems solved by technology

Chongqing Jiangjin District Qianjin Welding Materials Factory wrote "A Transmission Device for Electric Screwdriver with Adjustable Knife Head Angle" patent mentioned that the angle of the knife head of the electric screwdriver can be adjusted, so that the electric screwdriver can work under abnormal working conditions, which is convenient and practical , but the invention only changed the structure of the transmission device, and did not essentially improve the control accuracy of the screwdriver bit screwing depth

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