One machine for everything: Weatherproof shredder for processing a wide range of materials

More than 50 percent of Swiss municipal waste was recycled in 2017, according to an OECD study. Maag Recycling AG, a regional waste management company in Winterthur, is also a factor in this high rate.

It is difficult to find spare parts for the long-serving rotary shear
In order to process the raw materials appropriately, the recycling company has had a rotary shear in use since 1999, which is operated in a primary treatment stage for shredding various input materials – mainly components made of aluminium, copper and zinc.
However, with the increasing age of the plant, the maintenance effort had increased and the search for spare parts became arduous. “Based on the problem we contact Erdwich for the new acquisition”, reports Maag.
The frequency-controlled twin-shaft ripper, based on the RM1350/2-2000 model developed by Erdwich, no longer produces strips – instead, the input fractions are processed into a homogeneous output material thanks to 24 ripper blades.
Depending on the material and the configuration of the cutter set, parts measuring 6 x 1 x 0.5 m can be shredded to a size of approximately 100 x 100 x 100 mm. To this end, control programmes can be stored or the machine can be freely programmed to adjust it for the different input materials.

Another factor contributing to a high throughput rate is  the radial feed press integrated into the hopper, which presses voluminous and light materials. These features result in a higher hourly throughput.
Since the power of the plant, with 2 x 55 kW, is designed in accordance with great importance being placed on a considerable degree of robustness, even massive parts which can occasionally arise can be processed. This was impossible with the rotary shear.

Limited space environment demands adjustments to the system
The input material is fed into the ripper’s hopper by means of an excavator with a polygrab meaning the RM1350/2-2000 can thus be conveniently remotely controlled from the grab’s cab. After shredding, the material falls onto a vibrating conveyor chute directly below the plant.
In addition to the ripper, a discharge belt with an ascending element and an overhead magnet are installed to separate the Fe fraction.
This is followed by a sorting station with protective roofing.
The entire shredding solution now has external dimensions of 9 x 7 x 4.4 m.

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