The Liebherr LH 60 M Port material handling machine will have a very special assignment. It will be assuming a key role in the quarrying and production of the unique Brienzer Sand®, a Swiss natural product. The powerful machine will be handling natural sand and gravel directly at the harbour basin at Lake Brienz, and will also be responsible for the subsequent feeding of the gravel plant.
The machine has just been handed over at the harbour of the gravel and concrete plant. Hans Ulrich Kern and Reto Studer of Liebherr-Baumaschinen AG in Reiden presented a symbolic key for the new Liebherr material handling machine to managing director Dominik Ghelma and the general manager of the gravel plant, Kaspar Thöni.
Dominik Ghelma is enthusiastic about the new Liebherr material handling machine: “We used to operate a rail-mounted 1970s-vintage cable excavator in the harbour. When we were looking for a replacement, we decided to purchase a Liebherr material handling machine. Quite simply, the overall package is optimally configured for us. We have found an extremely versatile machine with the right attachments for everyday operations in our harbour.” This overall package is rounded off by a Liebherr service agreement. “Regular maintenance will ensure a long service life and high level of availability of the machine,” stresses Reto Studer. “The service agreement means that Liebherr will perform the maintenance work on the LH 60 M Port, allowing the customer to focus all his energy on his core operations,” he adds.
For Kaspar Thöni, handling performance was especially important in the choice of machine which is expected to remove up to 80 000 t of natural sand and gravel from the harbour basin on an annual basis. The harbour has a depth of up to 9 m therefore it was a requirement that the operator be guaranteed a perfect view of his work area at each of the many different stages of the handling process. The Liebherr LH 60 M in the customer’s configuration meets this essential criteria without problems.
The material handler is powered by a 4-cylinder Liebherr diesel engine with Stage V emissions compliance which, in combination with the standard Liebherr ERC system, delivers an overall system output of up to 322 kW to guarantee maximum handling performance. Moreover, the LH 60 M features specially designed port equipment. The weight-optimised construction ensures that the machine can boast maximum lift capacities. The specially designed port equipment includes a 12.5 m cranked boom and a 10.8 m long stick which easily achieve the required grab depth and reach of up to 21 m. The hydraulic cab elevation can be variably adjusted to the corresponding work situation in the harbour to guarantee that the machine operator always has an optimum view of his working area.
The LH 60 M Port is equipped with a GMZ 80 clamshell specially configured to meet customer requirements. The GMZ 80 impresses with its optimum design and good penetration, guaranteeing excellent handling performance. The 1650 mm wide, 2.00 m³ clamshell buckets are equipped with teeth on the cutting edge, allowing natural sand and gravel on the bed of the lake to be easily detached and loosened. The water slots on the clamshell buckets allow the water to drain off efficiently during the extraction and handling process. A reinforcement set on the inside of the wear-resistant clamshell buckets enhances durability and at the same time extends the service life of the clamshell.
This type of grab is primarily used with machines of the 60 to 80 tonne class. During the design phase, care was taken when calculating the forces acting on the components to ensure that the flow of forces was optimised and weight was minimised, enhancing the overall performance. This has a positive effect on the machine’s fuel consumption. The 2-motor Liebherr slewing drive is equipped with a large-dimension anti-friction bearing and impresses with its high torque and lifting force of up to 50 t. This allows the grapple to work effortlessly, even under full load.