Multi-layer co-extrusion die head intelligent temperature control system and control method thereof

Abstract

The invention relates to a multi-layer co-extrusion die head intelligent temperature control system including a temperature acquisition module, an FPGA temperature control module, a drive heating module and a control panel. The temperature acquisition module includes N temperature acquisition units; the FPGA temperature control module includes an AD switching circuit, an FPGA control chip for realizing a fuzzy PID control algorithm, and a PWM output circuit; the drive heating module includes N drive heating units corresponding to heaters in a control partition; temperature signals of the control partition are acquired by the temperature acquisition units and are inputted into the FPGA temperature control module, and after treatment, N paths of PWM control variables are outputted and are respectively outputted to the drive heating units by the PWM output circuit in a single path mode. According to the control method, double-parameter input of a deviation e and a deviation change rate e[c] is adopted, correction values of a PID parameter value obtained by fuzzy inference are corrected, final PID input parameter values are obtained, and thus heating coil temperature intelligent control is realized.

Description

technical field [0001] The invention relates to the technical field of multi-layer co-extrusion blow molding machines in the plastics industry, in particular to a multi-layer co-extrusion die head intelligent temperature control system and a control method thereof. Background technique [0002] Blow molding technology is an important method of plastic molding process, and blow molding products account for an increasing proportion of plastic products. Among them, the multi-layer co-extrusion die head is the key equipment of blow molding equipment. Blow molding is mainly formed by melting and extruding resins with different melting points and different functions through multiple extruders, and compounding and co-extruding blow molding through multi-layer co-extrusion dies. There are mainly two types of existing co-extrusion dies, plane superimposed dies and spiral axial co-extrusion dies. Such as figure 1 As shown, it is a cross-sectional structure diagram of a five-layer p...

AI Technical Summary

Problems solved by technology

For this new type of planar stacking die, readjusting the PID parameter values ​​is not only demanding on the operator, but also time-consuming and laborious. Therefore, after adopting the traditional PID control method, its robustness is poor, it is extremely inconvenient for users, and it is difficult to achieve High-precision control directly affects product quality

In order to meet the needs of control and adjustment when the temperature value changes, the traditional temperature control system of the blow molding unit adopts a PLC-based computer integrated control method. This kind of controller is not conducive to the improvement of system integration, and its cost is high, and its weight and volume are large. ; Therefore, changing the temperature control method, and realizing real-time acquisition and rapid response to the temperature have become urgent problems to be solved in the design of the temperature control system of the co-extrusion die head

Images