FPGA-based thin film rolling tension control system and method

Abstract

The invention discloses an FPGA-based thin film rolling tension control system and method. The system comprises a tension signal collection module, a thin film rolling tension control module, a thin film rolling module and an upper computer operation panel. A programmable logic device FPGA controls a chip to achieve a fuzzy PID control algorithm, the speed controlled quantity of a brushless direct current motor is obtained, a double closed-loop control algorithm of the brushless direct current motor is combined, then signals are controlled to be correspondingly changed and adjusted when tension changes in the rolling process of a thin film, and constant control over the tension in the rolling process of the thin film can be achieved through real-time collection of tension of the thin film by utilization of the fuzzy PID control algorithm; the development cost is low, the integration level of the system is high, the steady state performance is good, the response speed is high, the control precision is high, and adaptability is high.

Description

technical field [0001] The invention belongs to the technical field of multilayer co-extrusion blow molding machines in the plastics industry, and in particular relates to an FPGA-based film winding tension control system and method. Background technique [0002] Blow molding technology is an important way of plastic molding process, and the proportion of plastic products produced by it is increasing in plastic products. It is also common to use multi-layer co-extrusion blow molding equipment for film production in China. In the film production process, the last process is to wind the produced film, and the quality of film winding directly affects the quality of subsequent processing. The accuracy, reliability and rapidity of the tension control system in the film winding process directly affect the quality of the film and the final winding effect. The main factor affecting the quality of film winding is the tension during the film winding process. If the tension is too hi...

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Problems solved by technology

However, in the tension system, there are often many interference factors. The roll diameter of the winding roller, the linear speed and the moment of the winding roller change at all times, so the tension system is a nonlinear and time-varying system. Its precise mathematical model unable to create

Although in the case of a given tension, when adjusting the parameters of the PID control process to an appropriate value, the requirements can be met under certain conditions, but when the external conditions change, the control parameters need to be readjusted, and automatic control cannot be realized. control, which is time-consuming and labor-intensive, and there will be instability during the work process, it is difficult to achieve high control accuracy

At the same time, the existing tension control system is controlled by PLC. In order to improve the control accuracy, most of them use imported equipment, which greatly increases the cost of the equipment. The control effect is unstable, the cost is high, and the control period is long. High demands on operators

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