Astec Recycled Asphalt Bins (RAP)

The collecting conveyor runs under the belt feeders to collect material from all the bins. The tail section unbolts, then easily reattaches to the collecting conveyor extension when adding future bins. The upturned end empties onto a scalping screen (if used) or onto an incline conveyor.

You can assure accurate mix formulas with variable-speed belt feeders. They let you change the production rate while keeping the mix formula unchanged. Each feeder is powered by a vari-able speed motor with a Danfoss^® controller and Sumitomo^® right angle reducers. These drives provide precise control of belt speed. Troughing idlers are standard with Astec conveyors. The troughing design results in a longer belt life and reduces material spillage. The troughing idler belt is supported on nine-inch (22.56 cm) centers. Flat idlers are optional. Head pulleys on both are covered with rubberized traction material that makes firm contact and moves the belt without slippage.

Inclined conveyors with rubber belts take the aggregate from the cold feed unit RAP bins to the drum mixer. The inclined conveyor is available in relocatable, stationary or portable designs. Most often, the inclined conveyor incorporates a scalping screen at the front end. On portable units, a transfer conveyor is used as the deck selector on two-deck screens. Pneumatically activated belt scrapers are standard on every Astec inclined conveyor. A walkway can be added as an option.

Dancing plate bin vibrators provide better material flow than common weld-on vibrators.

A load cell in the belt scale accurately indicates the weight of a section of belt running over a weigh idler. Load cell information, combined with the belt speed, shows how much material is entering the drum mixer. The scale includes a remote operated test weight for easy calibration. As material is run across the scale, a sample is routed to a truck via the cylinder operated drum bypass chute, then veried on a truck scale. All Astec belt scales come with wind guards to maximize accuracy.

Optional high-density polyethylene liners can be installed inside the bins for added wear protection. Liners also significantly reduce the friction between bin walls and material, producing ultra smooth material flow.