Система автоматичного регулювання співвідношення тверде/рідке в млинах з циркулюючим навантаженням
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Date
2021
Authors
Кондратець, В. О.
Сербул, О. М.
Дідик, О. К.
Мацуй, А. М.
Kondratets, V.
Serbul, O.
Didyk, O.
Matsui, A.
Journal Title
Journal ISSN
Volume Title
Publisher
ЦНТУ
Abstract
В статті приведені проміжні результати розробки і випробування системи
автоматичного регулювання співвідношення тверде/рідке в кульових млинах, що
працюють зі спіральними механічними класифікаторами в замкнутому циклі. The operation of a ball mill operating in a closed loop with a spiral classifier depends on the vacuum of
the pulp in it, which is characterized by a solid / liquid ratio. Supply to the entrance of the ball mill at the same
time ore and sand classifier, as well as changes in the circulating load in a wide range greatly complicate the
definition of this technological parameter. This situation has led to the fact that the solid / liquid ratio in mills
operating in such conditions can not be automatically adjusted, in turn, the deviation of the pulp vacuum from
the required value leads to significant losses. The study of the ball mill as a controlled object on the pulp vacuum channel made it possible to
describe it using the mathematical expression given in the article. The solution of this expression makes it
possible to characterize the change in the mass of the material in the mill over time, provided that a stepwise
action is introduced at the entrance - the volume flow of water or ore. A constant value of the mass of material in
the mill will clearly characterize the corresponding solid/liquid ratio. It has been found that it is important to
study the filtering capabilities of the control object, as control actions on water and disturbing actions on ore can
significantly change the vacuum of the pulp in some areas of the mill. The filtering capabilities of the mill can be
investigated by its amplitude frequency characteristics, which showed that at low circular frequencies the
amplitude frequency characteristics depend on the mode of operation of the mill - the magnitude of the
circulating load and the cost of the source ore. Using computer technology, spatial diagrams of the relative
oscillations of the mass of material in the mill from the amplitude and frequency of influences at its entrance
through the ore and water.
In the course of theoretical research it was determined that the only approach to ensure the required
accuracy of determining the solid / liquid ratio in these conditions is to filter the signals before applying to the
input of the identification unit of the ratio. Thus, the system of automatic control of the solid/liquid ratio at the
entrance to the mill is implemented on microprocessor means. Its operation on the laboratory test bench made on
the microcontroller showed high accuracy of stabilization of technological parameter, reliability in various
conditions of change of characteristics of input signals.
Description
Keywords
вимірювання співвідношення тверде/рідке, оптимізації вибору вимірювальних засобів, області зміни коливальних параметрів на вході млина, measurement of the solid/liquid ratio, optimization of the choice of measuring instruments
Citation
Система автоматичного регулювання співвідношення тверде/рідке в млинах з циркулюючим навантаженням / В. О. Кондратець, О. М. Сербул, О. К. Дідик, А. М. Мацуй // Конструювання, виробництво та експлуатація сільськогосподарських машин : загальнодерж. міжвід. наук.-техн. зб. – Кропивницький : ЦНТУ, 2021. – Вип. 51. – С. 203-210.