Hamm’s improved oscillation compaction

First published in bauma Preview - March 21, 2019

Hamm is improving the performance of one of its oscillatory type asphalt compactors. The DV+ 90i VS-OS model is now be able to cope with tighter turns due to the fitting of split drums. As a result, the machine can make a tighter turn while the exciter system is in use, without risk of damaging the surface being compacted.

A key feature of the machine is its new exciter configuration for the oscillator drum at the rear of the machine. This now has a separate, mechanically-independent oscillation unit that operates in each half of the split oscillation drum. Belt-driven, the system is also said to be maintenance-free, allowing it to last the lifetime of the compactor. Although the exciter units are separate, they are synchronised electro-hydraulically so that the same forces are applied. The system is said to react quickly and precisely, helping to optimise compaction performance.

Using oscillatory type compaction is suited to use on bridge decks, thin layers, in vibration-sensitive areas or at critical temperatures. The DV+ 90i VS-OS model also has a vibration system on its front drum, again with a split drum.