The Design And Research Of The Control System Of The Flat Vulcanization Machine Based On The AVR Single-chip Computer

In the rubber processing, the vulcanization is the last phase as well as the most important one. As the primary machine of the vulcanization,the flat vulcanization machine should have the ability of controlling the vulcanization's condition,such as:vulcanization temperature,time and pressure. The control precision will impair rubber product's quality directly.By analyzing, the control temperature of the flat vulcanization machine is an uncertainty, big, inertia and serious non-linearity object. In actual producing medium, the control precision of temperature is not accurate enough, which can not reach the national standard. So, designing the flat vulcanization machine with high precision tempreture--control to improve the quality of rubber products is of great significance of rubber industry. Usually, the vulcanized stress is not a necessary condition for the vulcanization chemical reaction, but for vast majority of robber products. So, to achieve high precision control pressure is also a necessary factor of the flat vulcanization. Meantime, the vulcanization time is a necessary condition for the vulcanization chemical reaction as well, the control precesion level of which is related to the success or failure of vulcanization. This study is on the basis of remaking the original control system of flat vulcanization and aimed at developing a control system which is of reliable, stable, precise control and reasonable price to achieve precise control of vulcanization condition.The text analysis on the basis of both domestic and international development status of the flat vulcanization machine's temperature control system, then, we made a simple introduction and contract with PID control of the basic tenets and the fuzzy's. In order to solve the difficulty that the PID parameter is hard to find the suitable one, and the influence on the control effect which is from reducing the unmodelled, dynamic status and model error.Meantime, In the vulcanization process, according to actual situation, that the vulcanization temperature is nonlinear,hysteresis/delay and big interference. This paper discusses the adaptive fuzzy PID's algorithm, which used in the application of temperature control of flat vulcanization. By comparing the simulation results of conventional PID with fuzzy adaptive PID, which proves that the control method of fuzzy adaptive PID is of shorter overshoot and regulation time, good dynamic and static properties, as well as a better adaptability and rubustness, which is superior to the conventional control. With the current experimental conditions, and in accordancing with the user's requirements, in this paper, the design of flat vulcanization control system is based on the high-performance AVR single-chip computer system, and using bridge circuit that makes up of PT100 platinum resistance sensor, and regulate the power at the zero-crossing of the two-way thyristor with the full sine wave circuit to achieve control of temperature. The control system equipped with the real-time date retention circuit when the power cut off, the switching output circuit of the MOS, XYD-19264AG graphic dot-matrix LCD circuit, and a series of external circuits, such as RS-485 serial communication interface circuit based on the MODBUS agreement. These make the effectivenees of single-chip microcomputer's hardware and software resources be fully played.Finally, base on the plat vulcanization machine's high control requirements and poor working environment,the paper introduced the popular anti-disturbance measures, particular the design of specific hardware and software anti-disturbance measures used in this paper. The specimen testing results show that the methods and the design is effective,and meets the design request.