The perfect dragline bucket for the world’s biggest hydraulic cable excavator

The cable excavator swivels and aligns the 44 m-long cantilever arm over the water surface of the gravel pit. The hoist cable is eased down, the dragline bucket plunges into the water and is lowered down to the gravelly soil. At the end of last year, a very special ‘dive’ lay ahead of one of Rädlinger’s 8½ cubic yard dragline buckets (6.5 m³): it was part of the new Liebherr HS 8300 HD when it was first used on a construction site. Since then, the 3.7 m-long and 9.3 tonne Rädlinger dragline bucket has been in action in Southern Germany.

The special tool is used for conveying and gathering bulk materials and for underwater extraction; it thus comes into its own in sand and gravel pits and for earthworks and dyke construction work. In order to ideally turn the power and performance of the world’s biggest hydraulic cable excavator into efficiency and greater quantities of extracted material, a suitable dragline bucket model is required. In close cooperation with the company Liebherr, the dragline bucket was optimally adapted to the supporting device. This is reflected, for example, in the simple operation, which enables fast loading and simple emptying. In the process, the robust, resilient and wear-resistant construction was not dispensed with. The completely welded construction made of highly wear-resistant steel is thus further strengthened in areas exposed to particularly high stresses. The drag chains are also generously dimensioned to compensate for wear and tear.

After the American manufacturer “Hendrix” withdrew from the market, the new Rädlinger dragline bucket established itself as a premium product with a market-leading position within a very short space of time. Based on the strong customer demands for larger versions, the company expanded the standard delivery range by twelve other types at the start of last year – these include the 8½ cubic yard dragline bucket for the Liebherr cable excavator.

Just like their smaller predecessors, the new models were optimised in the development phase by means of software-supported FEM calculations. With the simulation software, operating conditions and forces, which have an effect on components in reality, can be shown and simulated based on a model. Weaknesses and problems can thus be sorted out at an early stage in the product development process. At the same time, the simulation technology provides information on optimisation possibilities in terms of material savings, weight reduction and optimal design.

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