Temperature control device for full-automatic injecting blowing plastic hollow molding machine and temperature control method thereof

Abstract

The present invention relates to a temperature control device of an automatic injection plastic hollow molding machine. The device consists of a PLC-high-speed singlechip system, a temperature sensor signal amplification circuit, a heating device drive circuit and an operation panel; the method is that temperature information is converted into electricity information through temperature sensor; temperature signal is exerted into an operational amplifier through a bridge detecting circuit of the temperature sensor signal amplification circuit and a lowpass; after amplification, the temperature signals are converted into digital signals through a A / D converter of the high-speed singlechip, and then difference value is achieved after comparison with a temperature setting control value, and then a control value is achieved through fuzzy PID calculation; the control value is converted into square waves with certain dutyfactor; heating power of a solid-state relay for driving heated circle is output and controlled by an I / O port of the high-speed singlechip; a dynamic value and a setting control value of eight-way temperature are displayed in a dot matrix LCD module of the operational panel in real-time. The device and the method are exact in temperature control effect, high in performance-price ratio, simple in operation.

Description

technical field [0001] The invention relates to a temperature control device and a temperature control method, in particular to a temperature control device and a temperature control method for a fully automatic injection-blow plastic hollow molding machine. Background technique [0002] In the fully automatic injection blow plastic hollow molding machine, one of the important process conditions for injection blow plastic hollow molding is to affect the temperature of plasticizing flow, cooling and air pressure blowing. In the injection blow process, the temperature that needs to be controlled has the following three Type: 1. Barrel temperature: Barrel temperature is one of the temperatures that need to be controlled in the injection molding process. This temperature mainly affects the plasticization and flow of plastics: each plastic has a different flow temperature, and the same plastic due to Different sources or grades have different flow temperature and decomposition te...

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Problems solved by technology

At present, there are mainly three types of temperature control devices for fully automatic injection blow plastic hollow molding machines: one is to use a single-chip microcomputer or embedded chip to design a special control device. The temperature control device is a part of the special control device, but it must be designed by the design It is difficult for the engineers of the special control device manufacturer to modify the program, and it is difficult for the field engineer to modify the control program, and the modification method is not flexible; the second is that the programmable logic controller (hereinafter referred to as: PLC) is used as the control core device, and the temperature control instrument is used as the temperature control device. On-site engineers can modify the PLC control program according to the process requirements of injection blowing bottles. Since the temperature control instrument is completely self-contained, the effect of temperature control cannot be automatically adjusted by the control device according to different processes and temperature control values, and the required The number of temperature control instruments is large (at least 4 or more), resulting in bulky equipment; the third is that PLC is used as the control core, and the A / D and D / A modules of the PLC are used as temperature acquisition and control signal output devices of the temperature control device, industrial liquid crystal display The module is used as a human-machine interface. Although the on-site engineers can modify the PLC control program according to the process requirements of injection and blow molding, the system price is very high and the input cost is too large.

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