Hot Mix Plant Screens

Additional Details

A. 8’x10’ cold-feed bins feed different sizes of aggregate to an integral collecting-conveyor that runs underneath the bins. Each bin features its own adjustable gate to control feed rates of the different sizes of aggregate. The collecting con- veyor drops the aggregate onto a scalping screen mounted on the dryer/mixer unit. B. The scalping screen removes any oversized material from the aggregate and lets it fall away to the ground. Meanwhile, the screened aggregate drops onto a slinger conveyor mounted below the screen. The slinger conveyor carries screened aggregate to the drying drum. An integral weigh bridge monitors flow of material to the drum. Optionally, the scalping screen and weigh bridge can be mounted on a separate incline conveyor.
C. The drying drum rotates on a set of four trunnions. As the drum rotates, a burner fires a flame down the center axis of the drum. A series of flights inside the drum shower the aggregate through the burner flame to remove all moisture. Dry aggregate exits the drum to the unit’s twin-shaft coater. D. The liquid asphalt tank feeds liquid AC (Asphalt Cement) to the twin-shaft coater mounted on the dryer/mixer unit. Liquid AC is proportioned with extremely high accuracy by a special two-pump asphalt meter. Mass- flow type meters are also available. E. The twin-shaft coater mixes dried aggre- gate with liquid AC to make hot-mix asphalt. Fines returned from the plant’s baghouse
are also added to the mix in the twin-shaft coate. Additionally, RAP (Recycled Asphalt Pavement) can be added to the mix through a special dedicated inlet. Mixed asphalt discharges into the base of the plant’s drag conveyor. F. The baghouse receives the exhaust gas stream from the dryer/mixer unit. It filters out dust and small particulate (fines) carried by the exhaust stream. Fines are returned to the mix by a screw conveyor. G. The surge bin holds the mixed asphalt before it is loaded into a haul truck. Surge bins are available in either 50-ton or 100-ton capacity. Each size includes its own drag conveyor with batcher.
H. The control house contains all plant controls, which are mounted on a centralized control panel. A PLC (Programmable Logic Controller) controls mixing.
       
A. 8’x10’ cold-feed bins feed different sizes of aggregate to an integral collecting-conveyor that runs underneath the bins. Each bin features its own adjustable gate to control feed rates of the different sizes of aggregate. The collecting con- veyor drops the aggregate onto a scalping screen mounted on the dryer/mixer unit. B. The scalping screen removes any oversized material from the aggregate and lets it fall away to the ground. Meanwhile, the screened aggregate drops onto a slinger conveyor mounted below the screen. The slinger conveyor carries screened aggregate to the drying drum. An integral weigh bridge monitors flow of material to the drum. Optionally, the scalping screen and weigh bridge can be mounted on a separate incline conveyor.
C. The drying drum rotates on a set of four trunnions. As the drum rotates, a burner fires a flame down the center axis of the drum. A series of flights inside the drum shower the aggregate through the burner flame to remove all moisture. Dry aggregate exits the drum to the unit’s twin-shaft coater. D. The liquid asphalt tank feeds liquid AC (Asphalt Cement) to the twin-shaft coater mounted on the dryer/mixer unit. Liquid AC is proportioned with extremely high accuracy by a special two-pump asphalt meter. Mass- flow type meters are also available. E. The twin-shaft coater mixes dried aggre- gate with liquid AC to make hot-mix asphalt. Fines returned from the plant’s baghouse
are also added to the mix in the twin-shaft coater. Additionally, RAP (Recycled Asphalt Pavement) can be added to the mix through a special dedicated inlet. Mixed asphalt discharges into the base of the plant’s drag conveyor. F. The baghouse receives the exhaust gas stream from the dryer/mixer unit. It filters out dust and small particulate (fines) carried by the exhaust stream. Fines are returned to the mix by a screw conveyor. G. The surge bin holds the mixed asphalt before it is loaded into a haul truck. Surge bins are available in either 50-ton or 100-ton capacity. Each size includes its own drag conveyor with batcher.
H. The control house contains all plant controls, which are mounted on a centralized control panel. A PLC (Programmable Logic Controller) controls mixing.