Grasan has introduced a road-portable system for crushing concrete and asphalt rubble, including a primary impact crusher plant, side discharge conveyor, screening plant and closed-circuit return conveyor, that can be set up quickly without a crane or special tools other than a front-end loader and block-and-tackle, according to the manufacturer.
Setup time will vary according to terrain, weather and resulting ground conditions. Normally, the entire system can be set up or torn down in one day or less by an experienced crew.
According to Grasan, the key to quick set up is the company’s skid-on, skid-off hopper that can be transferred from its flatbed trailer to the crusher chassis in about 30 minutes, bolted down and ready for operation. A block-and-tackle and front-end loader can pull the hopper onto the crusher chassis, where self-centering guides assure proper alignment with the impact crusher.
With the hopper in place, the crushing plant is raised and leveled on six different independent hydraulic legs—two front, two middle and two rear—which provide total operational support without any braces, blocks or other support devices.
The portable side discharge conveyor is backed into place under the crusher discharge feeder and raised to operating height. Crushed material is discharged directly out the side of the impactor onto the side discharge conveyor in a short, straight line for a smooth flow to maximize production and minimize clogging. The portable horizontal screening plant is then driven into place under the side discharge conveyor and its legs are blocked. Lastly, the portable return conveyor is positioned.
In addition, portable radial stacking conveyors are usually added to the system to deposit crushed materials in piles according to produce size and type of material. Grasan impact crushers usually handle concrete and asphalt rubble, C&D debris, bricks, concrete blocks, stones and rocks. The impactor is also used to crush limestone and usually is designed with an end-discharge conveyor (instead of side) when used primarily for that purpose.
The Grasan plant uses a Hazemag APPH hydraulically controlled primary impact crusher. This impactor usually requires no secondary crusher and is faster, more efficient and more versatile than jaw and cone crushers for recycling applications.
A vibratory feeder under the crusher helps protect the discharge conveyor, and a magnetic separator is located near the top of the side discharge conveyor to pick out ferrous materials.
More information is available at www.grasan.com.