| With the continuous development of modern industrial manufacturing system,the requirements of the production site are constantly improving for the material conveying system,and gradually develop towards the direction of long conveying distance,large carrying capacity,low energy consumption and intelligence.Belt conveyor plays a pivotal role in the material conveying system.With the periodic or intermittent changes of production conditions,the automatic tensioning device needs to quickly control the real-time tension of belt conveyor,so as to achieve the purpose of safe and efficient operation and reduce energy consumption.The real-time dynamic tension control of automatic tensioning device is the key technical problem of high-quality and reliable operation of belt conveyor.In order to improve the tension control accuracy of belt conveyor,this paper makes an in-depth analysis and research on the tension control system of automatic tensioning device,mainly including the following aspects:(1)Establish the mathematical model of automatic tensioning device.Aiming at the disadvantages of low transmission efficiency and high energy consumption of the traditional tensioning device driving mechanism,the permanent magnet direct drive and frequency conversion technology are adopted to abandon the traditional tensioning device driving mechanism,redesign the tensioning device driving mechanism,calculate and select the main components in the designed automatic tensioning device,and deduce the mathematical model of each component of the tensioning device based on the working principle of the new automatic tensioning device,finally,the tension closed-loop mathematical model of automatic tensioning device is established.(2)Model simulation of permanent magnet synchronous motor speed regulation system.Compare different vector control strategies of the motor,apply the selected vector control strategy to the speed regulation control system of the motor,and conduct simulation analysis.The results show that the vector control strategy of permanent magnet synchronous motor has good anti disturbance characteristics and strong robustness.(3)Design and comparison of automatic tensioning device control system.PID and fuzzy PID control strategies are designed respectively,and the two control strategies are applied to the simulation model of belt conveyor for simulation and comparative analysis.The results show that the fuzzy PID control strategy can improve the tension control accuracy of the automatic tensioning device,and the response speed is faster.(4)Simulation analysis of the running process of belt conveyor.The dynamic model of belt conveyor established by AMESim and the tension intelligent control system designed by Simulink are jointly simulated to study the dynamic characteristics of belt conveyor and automatic tensioning device,so as to solve the problems of unstable tension and difficult analysis of dynamic characteristics of belt conveyor.(5)Collaborative optimization of parameters of belt conveyor.The multi-objective optimization of belt conveyor is carried out by using NSGA-Ⅱalgorithm,and the Pareto optimal solution set is obtained.On this basis,the optimal scheme determined by the weighted Minkowski distance method is more conducive to reduce energy consumption and make the tensioning device operate safely.At the same time,the determination of conveyor belt speed by orthogonal experimental design is the key factor affecting the traction force of tensioning trolley. |
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