Air ring cooling system controller and control method based on field programmable gate array (FPGA)

Abstract

The invention discloses an air ring cooling system controller and control method based on a field programmable gate array (FPGA). The air ring cooling system controller and control method are used for controlling an air ring cooling system of multi-layer coextrusion blow molding equipment, so that the optimal control effect is achieved. The air ring cooling system controller mainly comprises a hardware circuit part and a control method part based on the multi-objective optimization algorithm. The air ring cooling system of the multi-layer coextrusion blow molding equipment is mainly used for controlling the uniformity of a film. However, the relation between the film thickness and the motor controlling quantity is complex, and a good control effect cannot be achieved through a traditional control method or a traditional controller. According to the air ring cooling system controller and control method based on FPGA, the intelligent control algorithm and the on-chip technique are combined, the fuzzy rule scale in the controlling process is optimized, the intelligentization of the control system is achieved, the control precision and product quality are improved, and meanwhile the uniformity and yield of the film are substantially improved.

Description

technical field [0001] The invention belongs to the field of high-precision automatic air ring control, relates to a control method based on a multi-objective optimization algorithm to optimize a fuzzy rule scale and replaces a traditional PLC system with an embedded system, and specifically relates to an FPGA-based air ring cooling system control devices and control methods. Background technique [0002] The air ring is a cooling molding part of multi-layer co-extrusion blow molding equipment, which has a great influence on the surface quality, output, thickness and uniformity of the film. Among them, the uniformity of the film thickness is a very key indicator. Whether the film thickness is uniform or not It is the basis for testing various properties of the film. If the thickness of a batch of films is uneven, it will not only affect the tensile strength, tear strength, and barrier properties of the film, but also affect the subsequent processing of the film. Therefore, ...

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Problems solved by technology

From the perspective of the control process, there is no clear relationship between the film thickness change and the motor control value. The thickness change of films of different thicknesses and different positions of the valve and the control value are non-linear and irregular. The influence is very large, and the adjustment has hysteresis, so that different moments are related to each other. For this highly nonlinear, strong coupling, time-varying and control uncertainty system, its precise mathematical model is almost impossible to establish, even if it can Establishing a mathematical model is also very complicated and difficult to solve, so that it has no practical value, while the traditional control has a better control effect on the more deterministic control model, but the control effect on highly nonlinear, uncertain, and complex feedback information is poor or even powerless; In addition, foreign countries have imposed blockades on automatic air ring technology and control devices, so that domestic film manufacturers can only purchase foreign control technologies and control devices at high prices, and most of the control devices are traditional PLC control, with low control accuracy; Most of the control technologies developed by manufacturers themselves use traditional PID control, which has poor control effects; a few use fuzzy control, but the shortcomings of fuzzy control rule tables are difficult to establish and poor adaptability also limit the development of automatic wind ring technology

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