Arjes put through its paces shredding demolition waste in Finland

Published 9/3, 2021 at 13:13

Kivisampo Oy is the Finnish dealer for German company Arjes, which has been manufacturing double shaft shredders in various sizes since 2007.

The company’s smallest Arjes machine recently undertook a demonstration programme in Finland with the unit shredding a wide range of materials. 

“We quickly decided to add the Arjes Impaktor 250 evo to our product range because there is a clear mandate for a small crusher. Many recyclers need to crush several materials, but the volumes may not be large enough. Nevertheless, every challenge must be addressed and this works very well with the compact Impaktor 250 evo. After the start of the demo tour, operators seem to have a great demand for a small and versatile machine that can shred numerous waste products,” says Petri Ihainen from Kivisampo Oy. 

The Impaktor 250 evo can be equipped with two different types of shredding shafts: one pair of shafts is for crushing concrete and asphalt, whilst the other is for such materials as waste wood, roots, mixed construction waste and other types of waste.

The shafts on the units are 1,500mm long and 680mm in diameter, are attached to a quick change cassette and can be changed quickly if the material to be shredded changes. Below the shafts is a crushing bar and two counter rakes on both sides. When crushing concrete and asphalt, counter screens are kept closed so that the grain size of the end product is 0-60mm. If the material to be crushed changes, the counter screens should be opened, resulting in a larger proportion of the end product. For example, tough roofing felt or wood waste is discharged in pieces of 0-250mm in size. 

“The compact Arjes shredder is best suited where a variety of materials need to be processed, but in manageable quantities,” Petri Ihainen continues. In the first demonstration test run, the capacity for concrete was 65-70t/h with a material feed size of 0- 700mm. Compared to impact and jaw crushers, there were no material blockages and interruptions in operation, according to Ihainen. All the metal in the concrete was broken into pieces of about 100-350mm and separated by a magnet. The machine also has a water spray system as standard to reduce dust in the hopper as well as on the discharge conveyor. There are three predefined programmes for adjusting shaft rotation, with pressure switches noting changes in the resistance of the shafts and adjusting the direction of rotation. “Thanks to this system, there is no clogging. The shafts each rotate at different speeds and in opposite directions to prevent clogging,” Ihainen adds. 

Equipped with a Stage V compatible 129kW Volvo Penta (TAD 581 VE) engine, the unit has easy access for maintenance and cleaning. The height of the discharge conveyor is 3m, which Ihainen states is very good for a unit of this size. The operator of the feeder can use the remote control to control the functions of the unit and, among other things, move the unit if necessary. All control functions are found on the mechanical levers on the unit’s side with the crusher unit itself being 2.25m3.

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