Dual-driving system and driving method of piezoelectric ceramic driving sheet for needle selector

Abstract

The invention relates to a dual-driving system of a piezoelectric ceramic driving sheet for a needle selector. The dual-driving system provided by the invention comprises dual-chip piezoelectric ceramic driving sheets, a base and power supplies. The dual-driving system is characterized in that the power supplies comprise a power supply for providing a positive electric field to one piezoelectric ceramic sheet within a same time period and a power supply for providing a negative electric field to another piezoelectric ceramic sheet, wherein the negative electric field is lower than a coercive electric field of the other piezoelectric ceramic sheet. The invention also provides a driving method of the piezoelectric ceramic driving sheet for the needle selector. The dual-driving system and the driving method thereof provided by the invention have the advantages that when the positive electric field is applied to one piezoelectric ceramic sheet for the piezoelectric ceramic driving sheet, the negative electric field is applied to the other piezoelectric ceramic sheet, so that not only can the swinging strength of the piezoelectric ceramic sheets be increased, but also the applied positive electric field can be lowered appropriately, thus improving and prolonging the safety and the service life of the piezoelectric ceramic sheet applied with the positive electric field.

Description

[0001] technical field [0002] The invention relates to a needle selector in the mechanical textile industry, in particular to a double-drive system and a driving method for a piezoelectric ceramic driving plate of the needle selector. Background technique [0003] As we all know, in the mechanical textile industry, according to the process requirements, the pattern can be sewed by controlling the operation mode of the needle. At present, the general practice is to use a needle selector, especially a piezoelectric ceramic needle selector to realize the automatic operation of the needle. The structure of an existing piezoelectric ceramic needle selector is as follows: figure 1 As shown (partial perspective view), the piezoelectric ceramic needle selector 1000 includes a plurality of piezoelectric ceramic driving pieces 100 , a conductive base 300 , and a needle selection head 500 installed at the front ends of the plurality of piezoelectric ceramic driving pieces 100 . The...

AI Technical Summary

Problems solved by technology

[0007] The driving system of the existing piezoelectric ceramic driving piece has the following disadvantages: in a certain period of time, only one of the piezoelectric ceramic driving pieces of the bimorph piezoelectric ceramic is displaced and driven due to the electric field applied to it. force, while the other piezoelectric ceramic piece is in a non-working state

This situation leads to the need to apply a large electric field to the working piezoelectric ceramic sheet to obtain the required displacement and driving force, thus increasing the possibility of the piezoelectric ceramic sheet being broken down and reducing the service life

However, the replacement of piezoelectric ceramic sheets is very troublesome, and even the entire piezoelectric ceramic needle selector needs to be replaced, which will inevitably lead to an increase in equipment costs

In addition, only applying a voltage on one piezoelectric ceramic sheet has a small adjustment space for displacement and driving force, which will lead to low weaving efficiency and unstable quality

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