Research On Control System Of Triboelectrostatic Beneficiation Equipment Based On Fuzzy PID Control

The development and application of triboelectrostatic beneficiation technology is promising because it can efficiently separate fine materials without the need for water as a medium.However,the triboelectrostatic beneficiation equipment is still at a low level of automation,for example,the start-stop control and parameter setting of each device mostly need to be manually performed on site.In order to improve the efficiency,enhance the safety and stability of the triboelectrostatic beneficiation system,a set of control system based on fuzzy PID algorithm,LabVIEW and PLC is designed and developed in this paper.The details are as follows:After analyzing the structure and working principle of the electrostatic beneficiation system,it is found that the air volume,as the parameter running through the whole process,directly affects the separation effect,so it is essential to ensure its stability and adjustability.PID control is not only simple in structure,but also robust,which is one of the most widely used control methods in the field of process control.However,single PID control also has its limitations in some complex industrial processes.After considering the actual operation characteristics of the electrostatic beneficiation system,the fuzzy algorithm is adopted to adjust the three parameters of the PID controller on-line in order to realize the rapid and accurate control of the air volume.The simulation models of fuzzy PID and traditional PID are established respectively in Simulink platform,and simulation results of the two models are compared under the input step signal.The results show that the fuzzy PID controller has better control effect.The upper monitor software is developed for the triboelectrostatic beneficiation control system in LabVIEW programming environment.After researching and analyzing the functional requirements of each part of the control system,the software is divided into five parts: login module,communication module,co-simulation module,device monitoring module and database module.Meanwhile,the functional functions required for compiling each module are self-defined and encapsulated to realize the modular development of the software.In STEP-7 MicroWIN environment,the PLC part is programmed,including the sequential start-stop control of each device,as well as the monitoring of various parameters and data transmission in the system operation.According to the characteristics and compatibility of each software and hardware,the appropriate mode is chosen for communication: OPC communicationbetween PLC and upper monitor software,RS485 communication under DCON protocol between upper monitor software and data acquisition module,serial communication under Modbus protocol between PLC and frequency converter.Air volume regulation has a quick response and high control accuracy under the co-simulation of LabVIEW and Matlab.The man-machine interface of the upper monitor software has a reasonable layout and clear logic,which is convenient for users to operate.The whole triboelectrostatic beneficiation control system has perfect functions,high stability and good control effect.