Sinfimasa designed a double auger with screw conveyors and a bucket elevator for a difficult material, consisting of very different fractions.
On this occasion, our client is a waste treatment plant that needed to transport fine particles from a shredding machine. The bulk material to be transported was very heterogenous: it consisted of 60% rubber and plastics, 15% glass, soil and minerals, 10% textiles and wood, 10% paints and oxides, and 5% metals.
The material flow was 7 tonnes per hour, with a grain size of 0 to 20 mm, a density of 600 kg/m3, and a moisture content of 10 to 15%.
Closed screw conveyors
A conveyor belt was difficult to use, as spillage of material would cause an environmental problem. The solution was to design a system of closed screw conveyors that prevent the spillage of product. In addition, it also avoids manpower in the route and possible accidents with rollers and drums of a conveyor belt.
Robust and maintenance friendly
To ensure efficient extraction from the hopper that stores the material to be processed and to prevent product accumulation, Sinfimasa designed a double auger in a trough to allow inspection along the entire route and facilitate maintenance.
The auger was manufactured in HB400 anti-wear steel and a SEW geared motor was installed with sufficient power but a short rpm ratio to reduce wear and extend the conveyor’s useful life.
Oversized bucket elevator
For the elevation of the material, a bucket elevator was designed and manufactured with an anti-abrasive belt and stainless steel buckets with a filling level of 40%, just like the auger: low filling level and transport at low rpm to avoid product return and wear. Geared motor power ratings were also standardised to save on spare parts costs.