High-precision screwdriver based on piezoelectric stacks

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 an