The Research And Development On The Temperature Controller In Adhesive Production Process

In recent years, as the demand for man-made-board in our country growing, the production process of wood adhesive has been paid more and more attention. The traditional manual control method has drawbacks such as poor environmental conditions in the production locale and high product costs. Thus, using electronic equipment to control reaction temperature, reducing manual intervention and saving cost in man-made-board industry is becoming an inevitable trend.The production of adhesive is mainly carried out in a reactor. Different kinds of adhesive have different reaction characteristics and their inherent reaction mechanisms are very complicated. Large hot inertia,long time lag and nonlinear changes of the temperature in the reactor are the main difficulties to automate the production process of adhesive. It has great practical significance for plywood industry to improve product quality and to reduce costs via controlling of chemical reaction process parameters.Here we studied the Phenolic resin adhesive production process, analyzed the heat transfer characteristics of the reactor, summarized its particularity, researched on the specific application of fuzzy-PID complex control theory in adhesive production based on analyzing respective advantages and disadvantages of fuzzy control and conventional PID control algorithm, discussed the feasibility of the control strategy and designed an fuzzy self-tuning PID intelligent temperature control system. Details of the control algorithms and design process are also presented.During the designing process, we used the upper and lower structure to facilitate algorithm research and comparison and lay the foundation for distributed control adopted by large man-made-board enterprises. Technical requirements and actual condition of the factory had been fully considered during the design of hardware and software. Base on STC89C58RD+ and RTX51 RTOS, the part of lower computer was developed. STC89C58RD+ is a new generation enhanced 8051 single-chip computer produced by HongJin, which has the characteristics of strong anti-inerference ability,high speed and low power. is able to run RTX51 RTOS without extending external memory, particularly suitable for the industrial monitoring area; upper computer programs is developed based on LabWindows/CVI, LabWindows/CVI is a fully integrated standard C development environment, majorly apply on developing virtual instruments, has great flexibility and can be easily interface with other hardware, carry a lot of functions, users can develop complex program in a relatively short period. For reducing the cost of the controller, control algorithms can be transplanted to the secondary controller to make it operate independently.After design completion, we installed the system and tested under field condition, turned parameters for fuzzy self-turning PID algorithm by experiments, obtained the fuzzy control rule table. Good results had been achieved.