Save resources and reduce costs: The better the quality of the screened material, the less frequently the ballast bed will have to be cleaned and tamped. Therefore, the screening quality is crucial for the cost-efficiency of a ballast cleaning machine and the overall technology.
The screen size, mesh size, screen vibration and direction of vibration and angle of the screens are essential for optimising the quality and output of a ballast cleaning machine’s screening unit. When working on superelevated track, it should be possible to place the screen in horizontal position. Guide mechanisms at the base of the screens control the ballast flow. They make it possible to provide more ballast when there are differences in superelevation.
Many years of experience gained by Plasser & Theurer’s design engineers with machines in operation all over the world ensure cost-efficient machine operations.
Optimising the quality and output of the screening unit:
Plasser & Theurer’s ballast cleaning machines are fitted with triple-deck screening units. The most common mesh sizes are 80/50/40 mm. (Other sizes are available on request.)
Our ballast cleaning machines produce excellent screening results. The figures of the recovered material are better than the figures of new ballast – depending on its quality. In addition, the recovered ballast has better frictional behaviour because it does not break at the edges like new ballast.
Again and again, attempts have been made to raise the screening output of ballast cleaning machines using unsuitable measures such as steep, over-long screens or pre-separators. Ultimately, these measures minimise the cleaning quality. Plasser & Theurer is on the right track: We use a separate screening car with double-screening units or triple-screening units to increase the screening capacity. This ensures the high-quality stone separation.
