calibrated at 30%, 60% and 100% of the feed capacity. When calibrating bins, individual aggregate sizes are run over a belt scale until the reading appears
constant. along an format.
These points are then plotted "X" and "Y" axis in a graph Usually, tons per hour and
feeder speed percentage are the used for each leg of the graph.
the bins have been calibrated, the openings should be marked and checked frequently for movement.
Cold feed bin gate openings must be
responsibility of the contractor, but the AC plant inspector should be familiar
This panel controls the feed rates (TPH) of the cold feed bins manually or automatically.
calibration will insure correct proportions for the different sized aggregates being delivered to the drier drum.
AC plant inspectors should know the gradings for each individual cold feed bin. Then, if a bin change is required at the cold feed, the Plant Inspector can perform calculations using the proposed bin percentages and determine whether the new combined grading is going to work.
Feeder controls (pictured above) regulate the amount of material flowing from each bin. Each cold feed bin can be controlled by this device as well as the combined aggregate rate for all bins being used to produce any asphalt mixture.
When the aggregate stream is decreased by more than
30 percent, the paddle pictured above will drop and send a signal to the plant controller.
be e q u ed Each of the aggregate feeders i p p determine the rate of feed (TPH, RPM, etc.) while the plant is in full with devices must that
production. This system, when functioning properly, provides a continuous and uniform flow of aggregates to the plant.
requires a device for each the troughing rollers.
feeder, which will monitor the Device, commonly referred