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Design of heating power control system for PET bottle blowing machine

by:Yosion Machinery     2022-09-10
In this paper, the 32-bit embedded processor LPC2292 is used as the core controller, the one-way thyristor is used as the execution component, and the principle of phase trigger power regulation and voltage phase compensation is used to design a heating system for PET bottle blowing machine based on LPC2292. After continuous debugging, the system effectively realizes the linear tracking adjustment control of heating power, and can control the stable heating of multi-channel infrared lamps. On the basis of the voltage phase trigger design, according to the power supply voltage detected by sampling, the trigger phases of different voltages are compensated, and the linear tracking adjustment of the heating power is finally realized. This design has been successfully applied to the heating control system of the PET bottle blowing machine. . 1. Introduction PET (Polythyleneterephtha-late, commonly known as polyester resin) bottle blowing 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 many more. A kind of bottled plastic hollow container. 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. Aiming at the characteristics of the heating system of the PET bottle blowing machine, based on the specific application of the product and the design principle of simplicity and practicality, this paper selects LPC2292 as the core controller, uses phase trigger power regulation and voltage compensation to control the heating power, and realizes the heating process. The output power is stably and accurately adjusted in the middle. 2. Principle of heating power control 2.1 System structure of PET bottle blowing machine According to the requirements of the heating system of the PET bottle blowing machine, the structure of the heating system is determined as shown in Figure 1. The host computer communicates with 14 power regulators through the Profibus bus, each power regulator consists of 10 infrared lamps to form a heater, and the host computer controls the output heating power of the lamps in each power regulator. The host computer can set the output power value, control mode, bus switch, sensor and other parameters of the power regulator, and at the same time monitor the output power of the power regulator, bus current and voltage, overcurrent and overvoltage, lamp abnormality, overtemperature alarm and other information . 2.2 Principle of phase-triggered power regulation In the initial analysis stage of system design, the AC power regulation and AC voltage regulation schemes were theoretically compared and analyzed. The field operation showed that the AC power regulation method had the phenomenon of infrared lamp flickering, which would affect the temperature stability. , and AC voltage regulation does not have such a problem. Therefore, according to the needs of the product, AC voltage regulation is selected to achieve linear tracking output of heating power. At the same time, according to the experimental results of power quantization and voltage quantization, a voltage with better effect is selected quantify.​​
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