Customer: Cementeria di Costantinopoli Barile,Italy
Primary crushing plant with apron feeder, stepped wobbler feeder and impact crusher
Plant Description
& EPR GmbH has built a new primary crushing plant for the Cementeria di Costantinopoli cement works inBarile,Italy. The plant design incorporates the very latest technology with one pre-screening stage.
The quarried material is transported to a hopper, from where it is extracted by a 10-metre long heavy-duty apron conveyor. The spillage material underneath the apron conveyor is collected by a lightweight scraper chain conveyor.
Because of the high percentage of fines in the feed material, a wobbler feeder has been installed upstream of the impact crusher to screen off the <60 mm material prior to the crushing process.
This reduces the demands on the crusher and also eliminates abrasive fines from the crusher feed. The screening surface of the wobbler feeder comprises a number of rotating shafts spaced at defined intervals, through which spaces the fines can pass.
Fitted onto the shafts are discs sized appropriate to the desired separation point. These discs are of elliptical/triangular shape which support the conveying process and prevent jamming. For this particular application, a two-section feeder design was chosen, with a step in the direction of material flow, thus promoting the agitation and breaking up of the material and consequently improving the screening performance of the machine even further.
The crushing operation is effected by one of ’s well-proven impact crushers, an AP-PMH 1615, which in addition to its rugged GSK-type rotor is distinguished by the hydraulically-actuated impact apron adjusting system which ensures that the aprons are retained in their set position during operation. On overloading or entry of tramp metal, the aprons can retract in a controlled manner, and then immediately return to their prescribed setting position.
Thanks to this hydraulic system, a high degree of operational safety is maintained with a consistent product quality. Another feature worthy of mention is the hydraulically-actuated inlet chute plate; should an excessively-sized rock be wrongly fed to the crusher and become jammed in the inlet, the chute plate can be moved at the push of a button and with simultaneous raising of the impact plates, the offending rock released into the crusher.
Technical Data:
Feed material: Limestone
Feed rate: 420 t/h
Feed size to the wobbler feeder: 0 – 1,000 mm
Wobbler pre-screening at: 60 mm, approx. 100 t/h
Feed size to the impact crusher: 60 – 1,000 mm
Product granulometry: at least 95 % < 65 mm