Research On Control Strategy And System Design Of PTFE Cable Insulation Extrusion Process

With the advent of the era of Industry 4.0,the global industry is in a stage of rapid development,and the accuracy requirements of PTFE wires and cables in various industries are constantly improving.However,the current level of automation and intelligence of domestic cable production lines is low,and the equipment used in most factories is relatively old,resulting in insufficient cable diameter control accuracy.In several production processes of wire and cable,insulation extrusion control is the process with the highest accuracy requirements and the most influencing factors,which has a great influence on the final wire diameter value and cable quality,and has great research value.The wire diameter control system designed in this paper is the control of insulation extrusion process,and the insulation extrusion wire diameter control system is mainly studied and designed from two aspects: optimizing the wire diameter control algorithm and upgrading the software and hardware of the production line.Firstly,based on the analysis of insulation extrusion process and system influencing factors,the transfer function model of the system controlled object is established.The least squares method and one-dimensional search algorithm with genetic factors are used to identify the unknown parameters in the model by joint control,and the actual transfer function model of the controlled object is obtained.Secondly,the insulated extrusion wire diameter control system is a second-order nonlinear system with hysteresis characteristics,aiming at the two main control difficulties of traditional PID controllers in this system: difficulty in adjusting control parameters and slow response speed in systems with large time lag,and intelligent control algorithms are introduced to improve them.Aiming at the problem that the traditional PID control parameters are difficult to adjust,the crowd search algorithm is introduced to optimize the PID controller,and for the defect that the standard crowd search algorithm is prone to fall into local optimization in the later stage,the two improvement methods of introducing simulated annealing idea and introducing chaotic optimization idea are compared,and finally the chaotic optimization idea with faster iteration speed is used to improve the algorithm.Aiming at the slow response of traditional PID control in large time delay system,a dynamic matrix control algorithm is introduced to improve the hysteresis characteristics of the insulation extrusion wire diameter control system.Combining the crowd search algorithm with chaos optimization and dynamic matrix control algorithm for PID control,a CASOA-DMC-PID control strategy is proposed,and various control algorithms are simulated through MATLAB and Simulink,and the results show that the CASOA-DMCPID control strategy has the advantages of overshoot,anti-interference performance and robustness.Finally,according to the actual production needs,the overall design of the distributed insulation extrusion wire diameter control system is completed to improve the automation level of the insulation extrusion production line.It mainly includes two aspects: hardware design and software design.Hardware design is mainly based on economy,reliability and customer needs,and various hardware equipment selection and circuit design are carried out.Software design mainly includes PLC program design and touch screen operation interface design.After the design is completed,experiments are carried out on the workshop site and the wire diameter data at the blanks joint are collected for comparison.The comparison of experimental data shows that the CASOA-DMC-PID control strategy can also achieve good control effect at the blank-material joint.