SU1546146A1 - Method and apparatus for automatic controlling of the process of milling in mincing machine - Google Patents

Abstract

The invention relates to the field of controlling the grinding process of solid materials in grinding aggregates, can be used in the ore-dressing, cement, and other industries and can improve the accuracy of control. To achieve this goal, the material consumption into the unit is changed depending on the deviation of the degree of filling of the aggregate from the specified value, the consumption of the mixture components is measured, the coefficient of the grindability of the mixture is calculated and the specified value of the degree of filling of the aggregate is adjusted depending on the coefficient of grindability. A device for carrying out the method comprises a metering device 3 of the initial mixture, a sensor of 4 degrees of filling, a controller 5 loads, a metering device 6 according to the number of components of the mixture, a block 7 for calculating the integral grindability, a block 8 for calculating the grindability coefficient, 9 for calculating a predetermined degree of filling. 1 il. 1 tab.

Description

The invention relates to the control of the grinding process of solid materials in ball, tube, multi-chamber, vertical-plate roller mills and can be used in the mining and processing, metallurgical, cement and other industries, where mixing is performed in fine process lines before grinding. various components.

The aim of the invention is to improve the accuracy of control.

The drawing shows a block diagram of a device for automatic control of the grinding process in a pulverizer.

The device includes an emulsifying unit 1, a transporting device 2 of the initial mixture and a dosing device 3 of the initial mixture, a sensor 4 degrees of filling of the grinding and chilling unit, a loading controller 5, dosing devices 6 according to the number of components of the grinded mixture

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grindability, block 8 for calculating the grindability factor and block 9 for calculating a predetermined degree of filling.

The method is carried out as follows.

The various components of the mixture are fed to the conveying device through the metering devices 6 of the components of the initial mixture, with each of the components of the mixture having a certain amount of efficiency. As the percentage of any of the components changes, the grindability of the raw meal as a whole decreases or increases.

Suppose that a mixture of three components enters the grinding unit: limestone, clay, and blast furnace slag. In the process of adjusting the composition of the raw mix, the clay content increases. Since clay is the most milled component, the coefficient of grindability of the mixture also increases (this coefficient is inversely proportional to the amount of energy required to grind a unit of weight of the initial mixture). With an increase in the grindability ratio of the mixture, the passing capacity of the grinding unit increases, therefore, it is possible to increase the specified degree of filling of the unit, thereby increasing the consumption of material in the unit and its performance. At the same time, the quality of the product at the outlet does not change.

In case the percentage of difficult-to-grind material, for example, blast-furnace slag, increases in the composition of the mixture, the grindability ratio of the mixture decreases, the set degree of filling of the aggregate decreases and the possibility of production of defective product is eliminated.

An example of the numerical implementation of the technical solution is presented in the table (lime grindability - 1.2%; clay grindability - 3.5%; grindability of blast-furnace slag - 0.7%).

The device works as follows.

The material through the transport device 2 and the metering device

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3 of the initial mixture enters the grinding unit 1. The signal from the output of the sensor 4 degrees of filling is fed to the input of the controller b loading. The rms of the metering devices of several components of the initial mixture are connected to the corresponding inputs of the integrated grindability calculation unit 7, the output of which generates a signal corresponding to the total grindability of the mixture at the current time. The signal of the block 7 is fed to the input of the block 8 to calculate the 5 ratio of the grindability, on the other input of which a signal is output from the output of the metering device 3 of the initial mixture.

Thus, as the hard to grind fraction decreases, the integral grindability increases, and the crushability ratio of the mixture also increases, the signal from the output of block 8 goes to the input of block 9 for calculating a given degree of filling. In this case, as the magnitude of the signal from the output of block 8 increases, the output signal of block 9, which is fed to the second input of the load controller 5, increases. The latter produces a controlling effect on the increase in material consumption in the grinding unit, which leads to an increase in the productivity of the line.

The invention makes it possible to increase the accuracy of control by automatically adjusting the parameters of the load controller when the physicomechanical properties of the initial mixture are changed, which ensures an increase in the productivity of the unit and stabilization of the quality of the finished product.

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Claims (2)

1. A method of automatic control of the grinding process in a grinding unit, including changing the flow rate of the mixture into the grinding unit depending on the deviation of the filling level of the unit from a predetermined value, characterized in that, in order to improve the control accuracy, the flow rate of the mixture components in the grinding unit, calculate the ratio of the grindability of the mixture and adjust the set value of the degree of 3 1 depending on the grindability of the mixture, and with an increase in the grindability ratio, the specified value of the filling height increases, and with a decrease in the softening coefficient, it decreases. 2. A device for automatic control of the grinding process in a grinding unit, containing a loading controller, the first input of which is connected to a filling degree sensor and a grinding unit and a dosing unit of the initial mixture, the input of which is connected to the output of the loading regulator, in order to increase control accuracy, it is equipped with metering devices according to 46146  the number of components of the comminuted mixture, the integral milling unit ™ calculating unit, the grindability coefficient clearing unit and the predetermined filling level calculating unit; the second input of which is connected to the output 15 of the metering device of the initial mixture, the output of the calculator This grindability is connected via a unit for calculating a predetermined degree of filling with a second input of the load controller. 20