Research On The Needle Vibration Of Electronic Selector

As people's demand for knitted accessories such as clothes is increasing day by day,textile machinery as a tool for manufacturing knitting-wear draw more and more people's attention.As an important part of the jacquard circular knitting machine,the needle selector is responsible for carrying out the needle selection operation according to the fabric pattern data sent by the master,which is the key energy conversion device of the system.In another word,the needle selectors' performance and stability has a direct impact on the quality of the completion of the fabric.In this paper,the research is centered on the piezoelectric ceramic needle selector,Taking the mechanical structure of the existing 10-pole piezoelectric ceramic needle selector as the research object,firstly analyze the relationship between the driving voltage and disturbance of the piezoelectric ceramic under the‘inverse piezoelectric effect',then choose a proper driving voltage.And according to the driving voltage to calculate the force of the blade swing.According to the selected driving voltage,design the driving hardware circuit.Select the FPGA as the processor,modular circuit mainly includes the processor unit,optocoupler module,power module and so on.The main algorithm involves the processing algorithm of PLL,the algorithm of CLK signal acquisition and processing,the sampling and processing algorithm of falling edge of CLK signal,and the driving algorithm of piezoelectric ceramic slice.Verify the reliability of the hardware circuit,and use the jamming signal to test the stability of the filtering program.According to the huge noise problem generated by the needle selector while working,to select the blade baffle as the research object.The modal analysis of the blade baffle is carried out to understand its dynamic characteristics.From the establishment of mathematical equations and ANSYS software to do the modal analysis on the selector blade baffle.Try to use the polymer absorber material to replace the original nickel-chromium alloy material to improve the blade baffle to reduce the working noise,and do the modal analysis of the PLA material baffle.Comparing the modal parameters of the two materials,the thickness of the PLA material baffle is thickened to increase its stiffness.3D processing of PLA material baffle,and to use the decibel meter to verify the noise of different selectors with the installation of different baffles,the results show that PLA material baffle can greatly reduce the noise of the selector while working.The amplitude characteristics of the selected measuring point of the measuring baffle in the working mode of the selector are measured by Doppler laser vibration measuring device.The amplitude of the experimental results is in agreement with the simulation results.Although the amplitude of the PLA material baffle increases,it still meets the requirements of the selector.The results of the study have a certain significance in the field of vibration and noise reduction,and provides some theoretical basis for further research.