Machinery News

Liebherr’s first new gen concrete batching plant enters operation

The modular concept is leading to energy savings and reduction of waste in the production of concrete and aggregates

Liebherr has launched its latest batching plant generation. A mobile version went into operation just recently for a+b Asphalt- und Betonmischwerke GmbH & Co. KG in Germany.

The new Betomix and Mobilmix batching plant series can be fully put together from a modular system. Liebherr says that customers benefit from more configuration options, shorter lead times, faster assembly and high parts availability.

a+b Asphalt- und Betonmischwerke produces and distributes ready-mixed concrete, asphalt, gravel, sand and chippings. The company was equipped with a Mobilmix 3.0 concrete batching plant from the new Liebherr system, which has gone into operation in Bad Waldsee in southern Germany.

The plant delivers up to a 130 cubic metre output per hour with the Liebherr DW 3.0 twin-shaft mixer. Up to 210 cubic metres of aggregates can be stored in a total of six chambers. Four types of cement or binder totalling up to 400 tonnes are stored in the cement section.

The new plant requires up to 30 per cent less energy than previous versions, while the necessary electricity supply can also be lower because power peaks can be avoided. This is achieved by frequency converters for the drives on the mixer and feeder elevator. Liebherr says the soft start and soft stop of the drives reduces wear and tear on the mechanical parts, while the frequency converter can change the speed of the twin-shaft mixer during the mixing process for differing recipes.

The frequency converters enable an accuracy of +/- 0.5 per cent when metering cement. With a typical recipe using 300kg of cement per cubic metre of concrete, up to 7.5kg of cement can be saved, Liebherr says. This means that an annual output of 50,000 cubic metres of concrete, corresponds to savings of 375 tonnes of cement per year, leading to reductions in CO2 emissions.

Individual modules can be planned and manufactured independently of each other and combined with other modules. With a folding design and plug connections, the modules can be quickly assembled and put into operation at the construction site.

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