High grade tamping tines reduce the running costs of a tamping machine. Over the past two years Plasser has worked intensively on further development to extend the service life. The slim result promises cost-effective utilisation.
The cost efficiency of a tamping tine can be measured by the number of tamping cycles. Therefore the goal must always be a greater number of tamping cycles and longer intervals between replacements.
In this respect the original tamping tine made by Plasser & Theurer was seen to be the standard until now. Above all, two aspects have made a substantial difference. Firstly, production of the tine as a Monobloc component that is forged in one piece. Secondly, the tungsten-carbide armour which protects the surfaces that come into direct contact with the ballast and are therefore subjected to maximum wear.
However, better protection for high wear areas is not the only option for reducing the wear. From a preventive point of view it is equally effective to optimise the shape so that less wear occurs.
And now that is exactly what we have achieved with our new tamping tine. The tine shaft has been given a much slimmer shape which reduces the penetration resistance. The underside of the tine plate was also designed with a 5° slant so that a counterforce is built up as the tine penetrates. This provides relief where the tine is mounted in the tamping unit.
Both of these new features lower the stresses on the tine at the origin and reduce the wearing forces. Furthermore, there are fewer stresses on the tamping units which also has a positive effect on their availability.
In the autumn of 2012 several machines were equipped with the new tamping tine for scheduled service on the line. One of these is the 09-4XDynamic Tamping Express which is operated in Austria. This machine has performed about 200,000 tamping insertions (status: May 2013).
There are similar results in Turkey where a Duomatic 09-32 CAT was equipped with the new tamping tines. After more than 270,000 tamping insertions (status: May 2013) an inspection revealed no wear.
Apart from these two machines, that each received a complete new set of tamping tines, other machines were equipped with individual new tamping tines for test purposes. Up until now these have also supplied only positive results.
All of our customers can benefit immediately from the advantages of this innovation. The new tamping tine can now be ordered as an original spare part.