Structural Design And Research Of High Frequency Injection Valves Based On Piezoelectric Actuation

With the rapid development of air jet loom in the textile field,air jet loom has become the current mainstream loom because of its high efficiency,high quality and other advantages,while the response speed,control accuracy,energy consumption and other important performance of the air jet loom jet valve driven by electromagnetism is difficult to break through,which has become an important problem limiting the development of air jet loom.In this thesis,based on piezoelectric drive technology,we design a piezoelectric ceramic drive to replace the traditional weaving machine jet valve electromagnetic drive jet valve,using a piezoelectric stack driver to control the opening and closing of the weaving machine jet valve port,so that the overall response speed and control accuracy of the air jet weaving machine jet valve is improved,and the gas consumption is reduced.The research contents are as follows that.First,according to the displacement output characteristics of the piezoelectric stack,the type of piezoelectric stack displacement amplification mechanism and the material are selected through comparative analysis,after which the corner stiffness and maximum stress of the displacement amplification mechanism are calculated.The MATLAB software is also used to calculate the degree of influence of each parameter of the displacement amplification mechanism on its stiffness,and the influence of different parameters is analyzed.The range of values of the structural parameters is obtained.After that,the amplification model of the displacement amplification mechanism is selected through comparative analysis,the theoretical amplification of the output displacement is calculated by using the geometric relationship,and the relationship between the input stiffness and the output stiffness and the relationship between the cross-sectional dimensions of the lever amplification mechanism are determined.According to the air-jet weaving machine weft guidance system and air-jet weaving machine jet valve space size and gas flow requirements,the optimal structural design of the weaving machine piezoelectric jet valve is carried out by using the mechanical structure morphology transformation method to determine the structural parameters.Secondly,the static finite element analysis and modal analysis of the piezoelectric jet valve actuator were carried out.Using ANSYS Workbench 19.2 software,the output displacement,maximum stress value and first-order resonance frequency of the piezoelectric injection valve actuator with different structural parameters are analyzed to obtain the maximum stress value and first-order resonance frequency curves under different structural parameters,and the structural parameters adapted to the maximum stress value and first-order resonance frequency are selected optimally.The simulation analysis of the optimized model is carried out for each order of modal vibration.Finally,the dynamics of the piezoelectric injection valve of the loom is simulated.A mathematical model of the dynamics at no load and coupling is established,and MATLAB is used to simulate the dynamics model of the piezoelectric injection valve of the loom.From the simulation results,it can be seen that the loom piezoelectric jet valve drive mechanism can open the response of the loom jet valve opening in 6ms and close the valve opening in 10 ms.Compared with the traditional air jet loom jet valve,the opening and closing of the valve port are improved,and from the theoretical data,the piezoelectric driven jet valve of the loom can save 40% of air consumption compared with the traditional air jet loom jet valve.