How to judge in time that the ball mill will appear swollen?

During the grinding process, the balance of the material entering and leaving the grinding machine is out of balance, and there is a “blowing belly”, which does not happen suddenly, but has a process of occurrence, development and deterioration, and accompanied by various abnormal phenomena in the process. It is necessary to enhance the sense of responsibility, timely discover and adjust accordingly, and eliminate the “flatness” in a slight stage. The following phenomena can be used to judge the occurrence of "swelling belly":

First, observe the current

In normal operation, the grinder shows that the ammeter pointer of its main motor current always swings within a small range, indicating that the current change is small. Once there is a "flatness" to occur, the effective space is occupied by a large amount of material due to the increase of the amount of material in the mill, so the medium has a small range of activity, which is used to improve the useful work of the medium, and the load of the mill (medium, ore) The center of gravity increases, that is, the distance from the center of the mill decreases, the resistance torque generated by the eccentricity decreases, the power required to overcome the resistance torque decreases, and the total energy consumption of the mill decreases, and the current reading reflected by the ammeter decreases. The more severe the swelling, the more the current drops, and the lowest point when the grinding machine “swells”. Therefore, once the operator finds that the current is gradually decreasing, it should be adjusted in time to prevent accidents.

Second, listen to the sound

The sound produced by the grinding machine is mainly caused by the mutual collision between the transmission mechanism itself and the medium of the ore and the liner. The intensity of the impact sound emitted from the cylinder varies with the amount of the mill material. When the balance is to be inflated, the mill is filled with high-quality fraction slurry. The impact of the medium and the ore and the lining is weakened by the viscous pulp, and the sound gradually becomes dull. When the swell is severe, the sound in the cylinder almost disappears. Hear the buzz from other parties. Therefore, it can be found that the mill is swollen from the sound intensity when the mill is working.

Third, measure the quality score, look at the ore

The quality fraction and discharge of the normal working mill should be basically stable, but when the stomach is swollen, the mass fraction starts to increase, the amount of ore discharge is also large, the grain size becomes thicker, and “pre-spit” and “post-pull” appear. ". In severe cases, because the mass fraction is too large, the fluidity is not good, and the mine is stopped when it is completely "inflated". Therefore, from the change in the ore discharge mass fraction, particle size and discharge amount of the mill, it can also be found that the belly is swollen.

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