Design of heating power control system for PET bottle blowing machine

The blow molding machine is a machine that blows the preform of polyester material into a bottle through a certain process, and is used to blow mineral water bottles, various carbonated beverage bottles and various bottled plastic hollow containers. PET bottle blowing machine is generally composed of blank supply system, heating system, air blowing system and other auxiliary systems. Before the blank enters the mold and starts to stretch, its heating temperature plays a crucial role in the forming of the blank. Accurate control is generally performed between 80°C and 120°C. At present, the heating control method of the PET bottle blowing machine is mainly AC voltage regulation and AC power regulation to realize the output heating power. The AC voltage regulation controls the turn-on phase of the thyristor in every half cycle to realize the regulation of the effective value of the output voltage. The AC power regulation takes the cycle of the AC power as the basic unit. By controlling the thyristor to change the ratio of the number of on-off cycles of the thyristor, it is convenient to adjust the average value of the output power. The literature proposes an optimization scheme of circuit topology, compares the advantages and disadvantages of phase modulation triggering and zero-crossing periodic wave triggering, and points out that it is difficult to achieve linear power regulation with phase modulation triggering. Theoretical research, simulation and application of temperature control of PET blow molding machine have been carried out by using fuzzy PID control, internal model control, random adaptive predictive control, variable coefficient PID adjustment and other technologies. However, in practice, due to the large amount of calculation of these control methods, the online calculation is difficult, and the external influencing factors are more complex, so it is difficult to meet the actual process requirements.
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