Research On The Electronic Forming Algorithm Of Yarn Winding And The Control System Of Covering Yarn Machine

The coating process is an important process in the yarn production process.Its main function is to wrap multiple yarns together and improve the performance of the yarn.The traditional equipment uses gear drive,cam or groove barrel to guide the yarn to complete the winding and forming process of the yarn.When changing the twist and tension of the yarn,it needs to change the gear set with different transmission ratio,and the process modification is cumbersome.In addition,the bobbin made by using cam or grooved barrel yarn guide has the problems of fixed shape,yarn stacking and high mechanism cost,which is not suitable for the processing requirements of multi variety and multi process yarn.Because the control system of the covered yarn machine can control the double twist machine,the straight twist machine,the rubber band machine and other equipment,this paper designs the covered yarn machine control system according to the functional requirements of the covered yarn machine system,provides a multi motor drive scheme,and solves the shortcomings of the traditional equipment in producing multi process and multi variety yarns.The main contents of this paper are as follows:(1)In order to realize the yarn guiding function,an electronic yarn guiding mechanism based on servo system is designed.The mechanism adopts the transmission scheme of combination of synchronous belt and slide rail,which converts the forward and reverse motion of the servo motor into the reciprocating motion of the screw moving rod,thereby driving the reciprocating motion of the yarn guide head and realizing the yarn guide function.In order to improve the motion control performance of the servo system,the kinematic model of the yarn guiding process of the servo system is established.According to the inertia of the actual load and the actual kinematic parameters,combined with the servo system debugging software,the appropriate PID parameters are set.(2)According to the requirements of the forming process in the yarn guide process,an electronic forming algorithm is designed.This algorithm can complete the functions of bobbin shape control,hard edge optimization,yarn stacking optimization and anti screen yarn.Aiming at the problem of yarn stacking,the anti stacking measures of using cam and grooved yarn guiding mechanism are studied,the mathematical model of yarn guiding process is established,the causes of yarn stacking are analyzed,and the anti stacking algorithm of periodic dynamic winding ratio is proposed.Under ideal conditions,the algorithm has good anti aliasing effect through MATLAB simulation.(3)In order to improve the quality of the yarn produced by the covering yarn machine,it is necessary to ensure the accurate twist and stable tension of the yarn in the production process.Hall sensor is used to measure the spindle speed,the linear speed of roller,winding and spandex,and PID algorithm is used to control the speed.M / t speed measurement method is used to improve the accuracy of Hall sensor speed measurement,ensure the response and accuracy of PID speed closed-loop control,and improve the stability of system operation.(4)The experimental platform of the control system of the covering yarn machine is established.Through the experimental test,when the spindle speed is 10000 rpm,the speed deviation is less than 10 rpm and the control accuracy is less than 1 ‰;When the linear speed of the friction roller is 50 M / min,the speed deviation is less than 0.2m/min,and the control accuracy is less than 4 ‰;The designed yarn guide mechanism has the advantages of fast reciprocating speed,stable operation and high accuracy;The yarn produced by the electronic forming algorithm is beautiful in appearance,without hard edges and mesh problems;The periodic dynamic winding has better anti stacking effect than the anti stacking algorithm.Through parameter optimization,compared with the traditional equipment,the anti stacking effect is improved.The control system designed in this paper can produce yarn with accurate twist,stable tension and high forming quality.Compared with the traditional equipment,the modification of yarn production process is convenient.It only needs to modify the relevant parameters on the upper computer,and it is applicable to the production of multi variety and multi process yarns.