Fast start, fast stop
Conventional tamping machines work with an eccentric shaft, which sets the tamping tines into sinusoidal oscillation. “The large number of rotating and therefore wear-intensive parts, the continuous noise emission as well as the rigid and therefore inflexible control system caused us to break new ground with our ‘Universal Tamper 4.0’ development”, explains system7 CEO Hansjörg Hofer. The core of the machine, which has been awarded 20 different patents, is the low-noise tamping assembly with its fully hydraulic drive. The vibration and adjustment operations are implemented hydraulically. The advantage is that the vibration does not begin until shortly before the tamping tines reach their operating position in the ballast bed. “Modern proportional valves are able to control large quantities of oil in a very short period of time. A tamping operation only lasts 1.5 seconds. Such start-stop controls wouldn’t be possible at all with rotating vibration shafts”, states Hofer.