each bin may be, the #1 bin; ¾” x ½”, the #2 bin; ½” x
”, the #3 bin;
” x No.4, and the are pre-set in the
controller. A computer or some other electronic controls the weight of individual batch ingredients.
must be fully
automatic to materials for
extent that the only batch shall be a single
manual operation required for operation of a switch or starter.
An example of a 5-ton asphalt concrete batch with a target of five percent asphalt binder might be:
Storage Bins and Cold Feed Systems The aggregate storage bins and cold feed system used with a batch type plant, move cold (unheated) aggregate to the plant for processing. A loader is typically used to fill the cold feed storage bins. Extreme care must be taken by the loader operator when scooping up material from the stockpile at ground level. If the loader operator digs too deep, contamination of the
aggregates with soil materials will occur.
or underlying This type of
affect the gradation,
between each bin to prevent intermingling of the different sizes.
Good separation between coldfeed bins is not only good practice, but is required by Caltrans. These large bin dividers will not allow aggregates to over flow into adjacent bins.
Gates located at the bottom of the bins, regulate the amount of aggregate that discharges onto the collection belt. Gate openings can be adjusted to increase or decrease the discharge
from each bin. variable speed the amount of each bin, too.
Feeder controls (i.e., motors) can regulate material flowing from
The system, when
properly, provides a and uniform flow of
properly graded aggregate to the plant.