Study On Temperature Control System Of Plastic Injecting Machine Based On Single Chip

With development of the national economy and the industry progress, in our country mould plastics in shaping trade has obtained the rapid development in the nearly several dozens years. As mainly processing tools, because it has some advantages and irreplaceable function in shaping trade, it will be widely used in many domains. In plastic injection, the temperature of the plastic melting body is a very important parameter. Low and too high temperature will influence the final quality of the products. It helps to improve the utilization ratio of raw materials and product quality in moulding plastics if accurate temperature is controlled. In plastic processing, temperature control mainly includes the temperature control of material tube, spray nozzle and mould. The material tube temperature is the material tube skin heating temperature. The material tube wall quite is thick, therefore how to choose the thermo-element check point is extremely essential. On the different check point the temperature curve has big difference. So the two point parallel examination, namely simultaneously establishes the thermo-element in the material tube surface and the deep place, will obtain the quite stable temperature curve and be advantageous in the temperature control.At present the domestic injection molding machine temperature control system mostly has arranged the PID parameter neatly before programming the predecessor, namely programming the parameter in the procedure. Although this method can obtain the quite good control effect, but it has some shortcomings: (l)Artificial installation parameter is time-consuming, hard sledding, also the installation effect seriously relies on the experience of installators.(2)The solidification parameter control system all uses the same PID controlled variable in the identical model injection molding machine, It has neglected the difference of each injection molding machine performance, not -impossible to enable each injection molding machine all to achieve the optimum control effect. (3)After injection molding machine spare part replace, if it needs to adjust the PID parameter, it must do the artificial installation parameter and programs again.To the situation the Shenzhen Baike machinery limited company, we proposed that separate the PID parameter from the procedure and lay it aside in an independent memory area. The procedure obtains or t revises the PID parameter through reading or writing this memory area. After accepting the order to renew the parameter, the procedure can carries on the parameter self regulating to the system automatic modelling and accordmg to the model to decide, finally renovates the memory region laying aside the parameter.It not only has avoided the tedious artificial installation, but also PID parameter of each injection molding machine comes out under its most reasonable model. Each injection molding machine can achieve the most superior control effect. Even if the injection molding machine needs to renew the controlled variable, it only needs to operate on the kneading board the hypothesis key to come again the installation system parameter, simplified the system maintenance working.The PID control, the fuzzy control, the temperature gathering hardware electric circuit, how to conduct antijamming has mainly been researched. The temperature examination precision Enhanced to a certain extent.