EPP prepressing control system based on fuzzy control

Abstract

The present invention relates to the prepressing processing field, especially to an EPP prepressing control system based on fuzzy control. The system comprises the following steps: the step 1: initializing the memory and zone bits; the step 2: calculating the given curve of pressure in a prepressing pot; the step 3: calculating the pressure deviation E and the pressure deviation change EC in the prepressing pot; the step 4: performing fuzzification of the E and the EC, and performing table look-up calculation U; the step 5: determining whether U is smaller than 0 or not, and if the U is smaller than 0, opening an exhaust solenoid valve for U seconds, or else, opening an inlet solenoid valve for U seconds; and the step 6: after waiting for the ending of the air inlet or exhausting, performing sampling of a prepressing system, and repeatedly performing the step 2. Compared to the prior art, in the EPP prepressing control system, the fuzzy control thinking is introduced, the pressure control precision in the prepressing pot is obviously improved, a historical curve recording curve capable of displaying real-time pressure values and pressure given values is employed to display the pressure changing process and the pressure control effect in the whole EPP prepressing process through related trend charts so as to facilitate the monitoring of the system prepressing process through operators.

Description

technical field [0001] The invention relates to the field of pre-compression processing, in particular to an EPP pre-compression control system based on fuzzy control. Background technique [0002] The manufacturing process of EPP products mainly includes three processes: the pre-pressing process of EPP raw materials, the EPP molding process and the post-processing of EPP products. Before the EPP raw material is processed, it is generally necessary to pre-press the EPP raw material according to the technical parameters provided by the EPP raw material supplier. The essence of pre-pressing treatment of EPP raw materials is to control the pressure in the pre-pressing tank containing EPP raw materials according to a given pressure curve, so that the pressure in the pre-pressing tank and the internal pressure of EPP particles reach a balanced state. In this way, there will be a certain pressure inside the pre-pressed EPP particles, which has a great influence on the physical pr...

AI Technical Summary

Problems solved by technology

The development process of the EPP pre-pressure control system was before 2005. During this period, the EPP pre-pressure control system of Kurt Company realized the control of the pressure inside the pre-pressure tank through a special process controller. The main feature is a set of pre-pressure control system Only one pre-pressurization tank can be controlled, so the control cost of a single pre-pressurization tank is very high, and the system operation and maintenance are also inconvenient

After 2005, Kurt developed an EPP pre-press control system based on a programmable controller and a touch screen, and realized a set of EPP pre-press control system to simultaneously control six pre-press tanks for pre-press processing. The pressure control cost of the pre-pressing tank is significantly reduced. At the same time, the parameter setting and corresponding operation are carried out through the touch screen, which makes the operation more convenient. However, there is no historical data function for recording the pressure change during the pre-pressing process in this system, and the pressure inside the pre-pressing tank cannot be displayed. The historical change process of the system, that is to say, the actual pressure control effect of the system cannot be directly verified

At the same time, the intake and exhaust solenoid valves of the system operate frequently during the pressure maintenance phase, which will affect the mechanical and electrical life of related components in the system

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