Research On High Speed Of Warp Knitting Shogging Based On Servo Control

Warp knitting machine electronic shogging system as the most critical part of the modern warp knitting machine electronic control system,its performance determines the production speed and stability of the warp knitting machine;at the same time because of the complexity and accuracy of the warp knitting machine guide comb shogging movement and electronic shogging system because of the high-speed response is not good,limiting the high-speed warp knitting machine operation speed to further enhance,making the high-speed shogging system of electronic and high-speed has become The electronic and high-speed system of high-speed warp knitting machine has become the technical bottleneck of comprehensive numerical control of warp knitting machine.In this study,the electronic shogging system of high speed warp knitting machine is studied by the method of theoretical analysis,calculation selection,modeling simulation,experimental test and system optimization,in order to meet the requirements of high speed warp knitting machine shogging speed,high precision,high frequency commutation and high dynamic response.The study is carried out by the method of theoretical analysis-computational selection-modeling simulation-experimental test-system optimization.First of all,this topic mainly introduces the development of high-speed warp knitting machine and shogging system at home and abroad and the current research status,and points out the gap between the current domestic and international advanced level.The electronic shogging system of high-speed warp knitting machine is systematically analyzed,and the electronic shogging system of high-speed warp knitting machine must meet the motion characteristics of high speed,high precision and high frequency commutation of the guide comb through theoretical calculation method.Secondly,the ball screw and servo control system in the electronic shogging system were selected and calculated,and a test platform was built to test the responsiveness of the highspeed shogging motion of the guide comb in the warp knitting machine according to the requirements of the motion of the guide comb,and the high speed performance of the electronic shogging control system was tested by changing the servo inertia ratio,servo motor selection(e.g.motor power,number of magnetic poles,etc.)and other parameters.The effects on the high-speed performance of the electronic shogging control system were tested.The tests show that the servo inertia ratio of the electronic shogging system should be set in accordance with the actual load condition,otherwise it will cause the high-speed shogging motion error;the servo motor selection should consider the number of pole pairs and the rated power size,increasing the number of pole pairs of the servo motor can greatly improve the system responsiveness,while increasing the motor power will not help to improve the system responsiveness.Finally,the shogging motion mechanism model was established by UG software,and the dead zone error of the ball screw subsets,the reverse dead zone error when the guide comb completes different strokes,and the first six orders of inherent frequency and corresponding mode vibration pattern of the electronic shogging system with the selected ball screw were calculated by importing the constructed model into ANSYS Workbench software.By testing the following response curves of several AC servo systems commonly used in warp knitting machine electronic shogging systems,the lag time of the servo system is determined,and a compensation scheme is designed to compensate for the lag of the servo system by sending the shogging command signal in advance,i.e.,the advance of the shogging command signal is dynamically preset according to the real-time speed of the warp knitting machine to compensate for the lag of the servo system.It is tested that the method of advance shogging command signal can effectively compensate the hysteresis response characteristics of the shogging servo,and the operation speed of the warp knitting machine with electronic shogging system can be increased by more than 30%,thus significantly improving the productivity of the electronic shogging warp knitting machine.