When the ball mill is started, the instantaneous load is extremely large, and the starting current exceeds the rated current several times. If there is no varistor, the motor can't bear it. The frequency sensitive varistor has been adjusted to the set value, that is, the starting time, before the start of use. The mill must reach the normal operation to get rid of the frequency sensitive varistor within the specified time, otherwise the motor may be burnt. Therefore, when the miller is required to drive, when the mill does not operate normally and the current indicated current does not return to the rated current position, it cannot leave the starting point immediately.
When the mill reaches normal operation and the sound is not the same when the varistor is not turned off, the general grinding operator can determine whether the mill has broken the varistor from the change of the sound.
144. Why should the operator of the grinding machine pay attention to the current meter of the grinding machine?
Because the operation of each part of the mill is normal and the operating conditions are changed, it will be reflected to a certain extent in the change of current.
The mill is in normal operation, the operating conditions are constant, and the operating current is generally kept within the rated range. When the mill is inadvertently caused by the increase in the amount of ore, the phenomenon of "bloat" is caused. At this time, in addition to the abnormal sound, the current meter will observe the current drop. It shows that the steel ball and ore in the mill have not been subjected to impact and abrasion, but rotate together with the cylinder. At this time, the motor works at the minimum, so the motor can not reach the rated current.
If there is an abnormality in the transmission part, if there is a phenomenon such as a loose place in the other place or the coupling part, the current will periodically rise and fall and the swing will be severe.
Therefore, by observing the current change of the ammeter, it is possible to find some abnormal phenomena in the equipment and production conditions, and the mill operator must always pay attention to observe the current change during the production process.
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