Blow molding equipment intelligent temperature control system and method based on DSP and FPGA

Abstract

The invention discloses a blow molding equipment intelligent temperature control system and method based on a DSP and an FPGA. The system comprises a temperature signal acquisition unit, a multiple-temperature-zone decoupling control unit and a heating execution unit. The temperature signal acquisition unit comprises a thermocouple sensor, a temperature transmitter and an A / D conversion module. The multiple-temperature-zone decoupling control unit comprises an adaptive genetic algorithm optimization PID control parameter module, a PID control module, a DSP and FPGA communication module and a multi-path PWM output module. Temperature signals in all temperature zones are obtained through the temperature signal acquisition unit and input to an FPGA temperature control module for filtering and other processing; a processed result is sent to a DSP adaptive genetic algorithm optimization PID parameter control unit in a parallel communication mode; an optimal PID control parameter is found and sent to the FPGA temperature control module; the FPGA outputs multiple PWM control signals to control the temperature in all the temperature zones. The blow molding equipment intelligent temperature control system and method based on the DSP and the FPGA are used for multiple-temperature-zone decoupling control over blow molding equipment and have the advantages that the system integration degree is high, the steady-state performance is good, the response speed is high, and the control accuracy 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 intelligent temperature control system and a control method for blow molding equipment based on DSP and FPGA. Background technique [0002] Blow molding technology originated in the early 1930s and has undergone rapid development through multiple stages. At present, blow molding technology has become the third largest plastic molding method after extrusion molding and injection molding, and it is the fastest growing plastic molding method. Compared with other molding methods, blow molding equipment has low cost, strong adaptability, and can form products with high performance and complex shapes. [0003] Blow molding technology can be divided into two categories: extrusion blow molding and injection blow molding. Multi-layer co-extrusion high barrier blow molding unit, which is the most common blow mo...

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Problems solved by technology

This kind of controller is easy to implement, but there are some problems in this control method: 1) Since the heating system is a multi-variable nonlinear time-varying system with large inertia, serious coupling and large lag, since the PID parameters need to be manually input on site, Debugging is time-consuming, and when the environment is different, the PID parameters need to be readjusted, which is difficult to meet the requirements of blow molding

2) With the increase in the number of temperature zones divided by the die head of the multi-layer blow molding unit, the heat transfer coupling between each temperature zone is serious, and the temperature control accuracy of each temperature zone is required to be higher. The traditional PID algorithm control can no longer meet the needs of multi-layer high-performance films. Blow molding requirements

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