SU408660A1 - METHOD OF MANAGING THE WORK OF MILLS OF WET SELF-MILLING - Google Patents

Description

one

There is a method for optimizing the operation of wet self-grinding mills by measuring and maintaining the extreme power values of the drive motor of the mill.

However, with this method, the value of power corresponding to the optimal operation of the mill at the time of setting up the process may be far from the extremum during normal operation. This shift occurs in practice due to changes in the grain size distribution and the grindability of the original ore, water consumption in the mill, lining wear and other uncontrolled disturbances.

The peculiarity of the proposed method is that the signal of the increment of the material weight in the mill is additionally measured in the time interval, the signals of the power increments and the weight of the material are compared and, according to the results of the comparison, the performance of the mill feeder is changed.

This allows for improved accuracy.

The drawing shows a diagram illustrating the implementation of the proposed method.

The control circuit contains a drive 1, a mill 2, a power sensor 3 with a secondary device 4, an extreme controller 5, a material weight sensor 6 in the mill with a secondary device 7, an actuator 8, a regulator 9, a classifier 10.

The power of the drive motor 1 of the mill is measured using a power sensor 3 and a secondary device 4, the signal from which enters the extreme regulator 5. At the same time, a signal from the magnetoelastic sensor 6 of the weight of the material being crushed is fed to the controller through the secondary device 7. The signal from the controller output through actuator 8 controls the position of the regulator 9.

The regulator has three positions: I - feeder capacity ensuring the filling of the mill in all modes; II - unloading the mill; III - average performance of the feeder (ensures long-term operation of the unit in the field of power extremum).

With an empty mill, the regulator is set to position I, corresponding to the fastest filling of the drum with ore.

As the engine is filled, the engine power rises to a certain extreme value, and then begins to decrease. Following this, the regulator sets the regulator in position III with the help of an actuator.

If, after the specified permutation, the power decreases, the regulator switches the regulator to position I or II.

The choice of positions is made according to the following algorithm.

When reducing the power and weight of the material should increase the performance of the feeder (position I).

When reducing the power and increasing the weight, it is necessary to lower the performance of the feeder (position II).

Predolol: This method allows you to dramatically reduce fluctuations in the system and improve the quality of the adjustment process.

Subject invention

The method of controlling the operation of wet self-grinding mills by measuring and maintaining the extreme power values of the drive motor of the mill, characterized in that, in order to improve the accuracy of operation, the signal of weight gain of the material in the mill is measured in the time interval, the signals of power gain and weight of the material are compared and the result of the comparison changes the performance of the mill feeder.