Changing mix is achieved by varying asphalt batch mixing plant the feed rates of the aggregate, filler and binder feeders, with time delays so that the change of blend occurs at the same point in the coating drum. Sand tends to move more slowly through the heating drum, so the blend proportions batch plant will not necessarily change at the same point on the feed conveyor. It is common to divert a small amount of material to a waste chute when the transition point reaches the hot elevator.Drum mix plants are not really suitable for short production runs; asphalt batching plants although with sophisticated controls the change of mix can be accurate to within some seconds, production rates of hundreds of tonnes per hour may equate to a tonne every ten seconds or so.
Hot storage
Finished roadstone must be kept heated to avoid setting. Asphalt Batch Mix Plant for Sale It is commonly stored in large electrically heated insulated stainless steel silos, from which it is weighed into delivery vehicles. This may be achieved by intermediate weigh hoppers (which may shuttle between hoppers) or by mounting batch asphalt plant the hoppers directly on load cells. Control of loadout by this method involves accurately predicting the material "in flight" between the discharge door and the vehicle.
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