Research on influence of stiffness of electronic transverse system in warp knitting machine
Considering the issues such as poor transverse accuracy and dynamic performance of the warp knitting machine due to the influence of mechanical stiffness,the electromechanical coupling model for electronic transverse motion was established from the perspective of global electromechanical coupling.The mechanical dynamic stiffness matrix was derived,and key parameters affecting mechanical stiffness were identified.Considering the effect of the clearance fit on the stiffness of the mechanical structure,the intermittent recurrence formula under the closed-loop condition was derived,and the clearance amplitude and vibration frequency of the system were analyzed.By using function description method,Simulink software was used to simulate the influence of stiffness indexes on the performance of transverse moving system with clearance fit.The results show that increasing the equivalent axial stiffness of the lead screw and the support bearing in the axial direction does not contribute to the improvement of the system's operational stability.The axial stiffness of ball nut and the torsional stiffness of ball screw affect the transverse accuracy of comb table.The excessive axial tensile and compressive stiffness of the push rod is easy to cause oscillations and overshoot of the system.
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