Research And Design Of PTFE Cable Insulation Thickness Control System

With the booming development of power electronics technology and 5G communication technology,the electron industry has increasingly high requirements for the manufacture of cables and wires.Simultaneously,the insulation thickness control of cables and wires has always been the important research direction of this industry,which is committed to improving the control accuracy of insulation thickness and the automation degree of production line.At the present stage,the domestic cable and wire insulation thickness control system is not by a long sight to foreign countries.Based on the above research background,the insulation thickness control system of PTFE cable extruder is studied in this thesis.Firstly,the general planning of PTFE cable and wire control system is designed,that is,the control system is roughly introduced in which several modules are described and the changes of the traditional method are briefly introduced in this thesis.Then,according to the thickness of the cable insulation extrusion in the control system to detect the thickness of the insulation module with disturbance and delays,mathematical model is established in difficulties,poor adaptability and low control precision problem,this thesis USES a nonlinear time sequence(NARX)neural network with particle swarm(PSO)algorithm for global optimization strategy of control system.In this strategy,NARX neural network is used to approximate the transfer function with hysteresis term and the field measurable variables,so as to construct a transfer function more in line with the field data.Then according to the constructed adaptive value function,PSO optimization algorithm is used to optimize the PID parameters.Finally,the constructed transfer function and the optimized PID controller are substituted into the control system.The simulation results show that the algorithm has the advantages of small overkill,fast response,strong adaptability and small steady-state error when controlling the disturbance and time-delay systems.After the control strategy of the control system is determined,the hardware and software parts of the cable insulation thickness control system are designed according to the functional requirements of the system.Among them,the hardware part carries on the model selection and the introduction according to the modularity.Divided by modules,hardware modules include PLC,power module,CPU module,communication module and input/output(I/O)module.Among them,PLC chooses s7-1200 from Siemens,and the communication module communicates with PLC through Ethernet.I/O modules are divided into digital quantity I/O modules and analog quantity I/O modules.Then,according to the type of I/O module,the external hardware equipment required by the control system,including sensor,switch,encoder,caliper,motor,governor and inverter,is selected and connected to the module.After the selection of hardware equipment is completed,the PLC program is programmed using TIA PORTAL V14 platform.The software section includes configuration design and I/O port variable assignment.Next,according to the modular programming,the initialization program,the main program,the insulation thickness detection and alarm module,the pressure module,the push speed module and the traction speed module and other programs are written,and then the PID module is used to write the optimization strategy in this thesis by using the road map.After the software design of the control module is completed,the touch screen operation interface needs to be designed in order to make it more convenient for the operator to monitor the operation of the assembly line and adjust parameters.First,the communication between the platform configuration king and PLC was completed.Then,according to the analysis of the functional requirements of the control system,the interfaces of user-login,push production,blank filling,production setting,parameter setting,real-time curve and alarm events were written.Finally,the experimental data were collected.In order to more intuitively show the advantages of the optimization strategy used in this thesis,the experimental analysis of different lag terms input by the transfer function is carried out here.According to the comparison and analysis of experimental data,compared with the original control strategy,the NARX-PSO-PID cable insulation thickness control system can realize the high-precision automatic adjustment of the cable insulation thickness in the whole pushing process,and has strong anti-interference capability,which has certain practical application value and generalization.