Automatic control system and method of sand mill

The invention discloses an automatic control system and method for a sand mill. The method comprises the following steps: acquiring main shaft rotating speed values and feeding speed values at a plurality of preset time points in a preset time period; the main shaft rotating speed values and the feeding speed values at the multiple preset time points are arranged into a main shaft rotating speed time sequence input vector and a feeding speed time sequence input vector according to the time dimension; performing time sequence correlation analysis on the main shaft rotating speed time sequence input vector and the feeding speed time sequence input vector to obtain main shaft rotating speed-feeding speed full time sequence correlation characteristics; and determining that the spindle rotating speed value at the current time point should be increased or decreased based on the spindle rotating speed-feeding speed full-time sequence correlation characteristics. Therefore, the rotating speed of the main shaft and th