Design Of Tire Belt Tension Control System

To improve the control precision of cap ply winding tension and molding quality in the building process of tire, this paper takes the second section of two-stage molding machine of semi-steel radial tire as an example, that is LCE1418-02 JY, and then designs a set of tire belt tension control system. This system sets the cap ply tension controller as the core component, and meanwhile, HMI MT4424 TE with external storing data and Mitsubishi servo motor as auxiliary devices. This article regards a high performance DSC MC56F8037 as the main control chip, with the closed-loop feedback control method of double inputs and one output. Simultaneously, based on the operating condition of high power electrical equipments, it designs the tension circuit of anti-electromagnetic disturbing in order to ensure the effective control of tension. Besides, the main chip drives the servo motor by the optocoupler isolation to further improve the reliability of signal transmission.According to the analysis of tire cap ply tension model and the system function requirements, the software design of this paper selects the integral limit PID control algorithm with deadband. The system makes response in the case of the speed disturbance, and which is validated by Matlab simulation. The system software contains detailed modular design and dynamic modeling analysis, such as system state diagram, control sequence diagram and activity diagram.By many times of field testing, tension control system runs normally. The fluctuation of cap ply winding tension ranges within ±2N,and the speed of cap ply winding comes up to 400 m/min. Tension controller communicates with HMI reliably, which sets the tension value from 3N to 15 N, and controls accurately almost without prolapsed and knotting phenomena. Furthermore, this system could achieve the switches between automatic mode and manual mode in the winding process, which improves tire quality resulting in reduced number of rejects and scrap reduction. Finally, the prototye by the use of this design works reliable for one year, and the operating results meet the need of the user. Therefore, this paper accomplishes the automatic improvement for the second section of two-stage molding machine of semi-steel radial tire, more importantly, lays a solid foundation for further intelligent control.