SU145078A1 - The system of automatic control of the process of two-stage grinding of nepheline-limestone mixture in tube chamber mills - Google Patents

Description

The systems for automatic control of the two-stage grinding of nepheline-well-known mixture in tube chamber mills are known, which consist of an electro-acoustic frequency regulator for the ratio of the solid component to water according to the frequency of the noise in the pulping zone of the first mill and the regulator for the ratio between petroleum and slurry of the second mill.

In contrast to the well-known, in order to increase the accuracy of automatic control, a system of automatic control of the two-stage grinding of nepheline-limestone charge in tube tube mills is proposed, in which the pulp correction of the ratio of the solid component — water in the viscosity of the slurry at the outlet of the first mill — is applied, made with a viscometer and a discontinuous EPR regulator.

The drawing shows a schematic block diagram of a predolno automatic control system of the grinding process.

Grinding of nepheline charge in tube chamber mills occurs as follows. In the mill / come lime and water. The limestone pulp obtained at the outlet of the mill 1 is collected in a tank with a stirrer, from where it continuously enters the second mill.

Simultaneously with limestone pulp, nepheline enters the mill.

The mixture (pulp) after the mill 2 enters the mill 3, where the grinding is produced without changing its composition.

In the density control system, the signal from microphone 4 installed in the pulping zone is fed to the input of the ICh-6 frequency meter (pos. 5), the voltage at the output of which is measured by an EPD-12 electronic potentiometer (pos. 6). The potentiometer is equipped with a rheostat No. 145078-- 2 sensor, with which it is connected with the input of the electronic controller 7 of the brand ER-Ш-54.

The regulator 7 controls the actuator 8, which is an integral part of the slit-water metering device 9. The secondary device of the water metering unit is a differential transformer device 10 of the EPID-04 type, equipped with a resistance sensor.

A rheostat sensor is connected to the input (summation system of signals) of the same density regulator of the brand ER-SH-54, due to which a rigid feedback on the water flow is introduced, which ensures the necessary static error in controlling the frequency of the noise in the pulp zone. Additional corrections are introduced into the density control system from the viscometer // via the intermittent controller 12 and the secondary device 13 of the EPD type.

The charging of the mill with a solid component is controlled by means of a sensor 14, which is a microphone mounted at the beginning of the mill. The signal from the microphone is fed to the input of the ICH-6 frequency meter (pos. / 5), the input voltage of which is proportional to the frequency of the noise, measured by an electronic automatic potentiometer 16 of the type EPD-12. The potentiometer is connected via a rheostat sensor to the input of an electronic load controller 17 of the type ER-W-54, which, by means of the excitation motor rheostat 18, changes the speed of the drive of the power supply plate.

Limestone consumption is measured by the position of the plunger of an induction sensor installed in a tape weigher 19 and connected to the input of the load controller 20, thereby introducing a rigid feedback on limestone consumption.

Pa nepheline-lime ratio regulator pulp is assigned the task of stabilizing limestone module 2.14

nepheline limestone at the exit of the second mill.

The automatic control circuit of the second mill consists of a slit-type flow meter 21 of limestone pulp, the secondary device 22 of which is connected via a rheostat sensor to the summing circuit section of the regulator 23 of the ER-SH-54 ratio, the weighing tape meter 24 of the VL-1058M nepheline type with the secondary device 25 of EPID-06 type, graded in t / hour.

Using the EPID-06 rheostatic sensor, the signal for the amount of nepheline is fed to the second section of the summing circuit of the ER-SH-54 device, which acts as a regulator of the ratio of limestone pulp - nepheline. The viscosity correction of the nepheline-izvestnuyu nulpa carried out similarly to the first mill, i.e., through an intermittent regulator 26 of the EPR type.

Subject invention

 The system of automatic regulation of the two-stage neopheline-limestone process in tube chamber mills, consisting of an electro-acoustic frequency regulator of the mill-solid component, a ratio regulator of the solid component — water at the frequency of the sound in the pulping zone of the first mill and the regulator nepheline - pulp ratio of the second mill, characterized in that, in order to improve the accuracy of the automatic regulation, a pulse correction of the ratio regulator is applied th component - the water on the viscosity of the slurry at the outlet of the first mill made using the viscometer and discontinuous regulator EPR torus.