PID-based temperature grading control method

Abstract

The invention discloses a PID-based temperature grading control method. The method comprises the following steps of detecting the percentage content of cut stem moisture at a material outlet of a cuttobacco dryer, comparing the percentage content of the cut stem moisture with a threshold percentage value, setting a proportion parameter, an integral parameter and a differential parameter of a PIDcontroller as a first parameter combination under the condition that the percentage content of the moisture of the cut stems is greater than a threshold percentage value, so that a temperature controlsystem executes an instruction sent by the PID controller to regulate and control the temperature of steam and hot air, under the condition that the percentage content of the cut stem moisture is notgreater than the threshold percentage value, setting the proportion parameter, the integral parameter and the differential parameter of the PID controller as a second parameter combination, and enabling the temperature control system to execute an instruction sent by the PID controller to regulate and control the steam and hot air temperature, the proportion parameter in the first parameter combination being larger than that in the second parameter combination, the first parameter and the second parameter combination being the same in integration and differentiation. Continuity and stabilityof process control are kept.

Description

technical field [0001] The invention relates to the technical field of tobacco industry equipment, in particular to the flexible transformation based on the SH86 tunnel-type shred drying machine and auxiliary equipment. Background technique [0002] At present, the drying equipment for shredded leaves (stalks) in Liuzhou Cigarette Factory includes SH86 tunnel-type shredded drying machine and HDT air-flow shredded shredded drying machine, which mainly rely on the temperature of steam hot air to dry materials. Taking the SH86 tunnel-type wire drying machine as an example, after the equipment is preheated, after the first and second zones reach a fixed temperature (the first zone is 150±5°C, the second zone is 140±5°C), it will be completed automatically. After the equipment is installed, the PID controller controls the opening of the pneumatic membrane valve through the control system to keep the temperature stable. When the outlet moisture is abnormal (high or low), the tempe...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a PID-based temperature classification control method for the above-mentioned defects in the prior art, wherein the inconsistency of temperature control in the drying process of materials is solved by optimizing the PID parameters, and the control method is sought. The adaptability of the method in different grades and different process processing requirements

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