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Liebherr at Hillhead 2010

Liebherr-Great Britain Limited continues its allegiance to the Hillhead Show and is exhibiting at its usual location - Stand Number Z6 by the North Face of the quarry.

A complete Mobilmix concrete mixing plant will be erected on the stand, which is indicative of the continued success that Liebherr enjoys worldwide with these innovative and versatile modular plants. Concrete truckmixers will also be on show, with three of the company’s top-selling 7m³ and 8m³ capacity hydraulic drum assemblies – all mounted onto the latest Mercedes Axor and Actros chassis.

As always, Liebherr’s display at this year’s Hillhead Show also includes a separate area dedicated to the ever-popular Liebherr Shop where scale models, clothing and other pro-motional items can be viewed, purchased or ordered.

The Mobilmix 2.25 Mobile Concrete Mixing Plant

The Mobilmix 2.25 is a mobile horizontal plant which, through Liebherr’s unique design, has high outputs, features and capabilities which are equal to the production performance normally found on static plants. Of robust modular construction and capable of being transported on only a few vehicles, the Mobilmix 2.25 has easily assembled components for fast, safe erecting and dismantling. With all modules fully integrated – and the entire plant with aggregate hoppers and cement silos on their own steel foundations – the Mobilmix 2.25 can be installed quickly with minimum ground preparation and can be ready to batch within a few days of delivery to site.

The heart of the plant is the Liebherr twin-shaft mixer with production capacities of up to 100m³ “set” concrete per hour. Liebherr’s own well-proven Litronic MPS II microprocessor control, installed in its own integrated module, regulates and monitors the plant’s operation – moisture and temperature measuring devices are included, together with an admixture weigher.

The whole plant, with mixer and weigher platforms, is designed and built to provide ample space for routine cleaning and maintenance procedures.

The configuration chosen for the Hillhead show features four aggregate/sand hoppers, two 100 tonnes capacity cement silos and a standard 2.25m³ twin shaft mixing section with admixture dosing and pumping facility.

HTM Concrete Truckmixers

As usual, Liebherr is displaying its popular and successful hydraulic truckmixers. This year, three models are on show – two 8 cubic metres capacity HTM 804P and one 7 cubic metres capacity HTM 704P mixer drum assemblies. The chosen host vehicles for the Liebherr mixers this year are all from Mercedes, with the two HTM 804P drums mounted onto an Axor 32.36K 8x4 and an Actros 32.36K 8x4; the smaller capacity HTM 704P is mounted on to an Axor 26.33B 6x4 chassicab. All three mixer drums have been factory finished to the highest automotive quality at the Liebherr-Mischtechnik line-dedicated factory in Bad Schussenried, southern Germany.

The Liebherr HTM series features a drum constructed from special steel with wear protection on the mixer spiral blades. For the HTM 804P, the geometric drum volume is 14.29m³ and the capacity in set concrete is 8m³; water volume is 9.10m³. For the smaller HTM 704P, the geometric drum volume is 12.34m³, the capacity in set concrete is 7m³ and water volume is 7.70m³.

An important factor in extending the working life of the mixer drum and the host chassiscab is the Liebherr developed high-quality steel frame and U-clamp fixing method. Drum support pedestals are secured to the subframe by stirrup bolts that accommodate flexing. These are fitted close to the frame to avoid stress transference and to distribute loads uniformly. The design, coupled with the fixing arrangement, enables the mixer sub-frame to be rigidly attached at regular intervals over the entire length of the frame. This forms a composite strength while still allowing the body to flex as necessary to avoid stress damage or misalignment occurring within the mixer superstructure. This, in effect, produces such a rigid and stress-free fit that problems of cracking or distortion on either the mixer frame or truck chassis are avoided. The result is a considerably extended operating life for both the superstructure installation and the host vehicle.