Method for automatically adjusting rotating speed of roller according to production states

Abstract

The invention discloses a method for automatically adjusting the rotating speed of a roller according to production states. The method comprises the following steps: setting basic parameters and incorporating a calculating formula into a PLC; in a preheating stage: running a roller motor according to a frequency value F1 output by the PLC; in a converting stage I: after the preheating is completed, starting to feed materials for production, and enabling a system to enter the converting stage from preheating to production; in a production stage: running the roller motor according to the frequency value F output by the PLC; in a converting stage II: reducing the instantaneous flow rate P of an electronic scale in front of the roller to zero gradually, and enabling the system to enter the converting stage from the production to end; in an end stage: enabling the system to enter the end stage, and outputting the frequency F2 to the roller motor by the PLC. According to the method, the running frequency of the roller motor is automatically adjusted according to the flow rate of materials in the three running states of preheating, production and end; the rotating speed is switched stably; thin tailings are avoided; the false positive rate of a detecting meter is reduced; the rollout time of the tailings is shortened.

Description

technical field [0001] The invention relates to a method for automatically adjusting the rotation speed of a drum according to the production state, and belongs to the technical field of automatic control of tobacco shredded equipment. Background technique [0002] The horizontal drum is widely used as the necessary equipment in the tobacco shred production line. Its main function is to loosen, heat and humidify the materials. At present, the rotation speed of the drum is generally set to a fixed value according to the process requirements, but there is no differentiated control for the three production states of preheating, production and end. Especially at the end stage, the material flow rate gradually decreases, the constant drum speed cannot meet the material flow requirements, and the tailings are thin, which causes the results of the detection instrument to be distorted, resulting in misjudgment that the tailings are unqualified in terms of temperature and moisture. ...

AI Technical Summary

Problems solved by technology

However, in this control method, the drum speed cannot be changed gradually according to the change of the material flow rate, and the switching is too sudden. In the two stages of the operating state from preheating to production and from production to end, the operating frequency setting value rises sharply, and then There is a sharp increase in the material at the exit of the drum, and the flow rate is unstable, which directly affects the quality control of the subsequent process

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