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Material handling made easy
Dragline excavators from Liebher are used for a wide variety of applications with a dragline bucket, mostly for the mining of sand and/or gravel.
The dragline bucket is more or less cast as required through the swinging of the duty cycle crawler crane.
Duty cycle crawler cranes must endure especially high dynamic stresses during dragline operation.
Their robust steel construction not only increases the performance but also extends the service life making them perfectly suited for material handling operation.
The Interlock control system allows for power regeneration in dragline operation. This reduces the fuel consumption as well as the wear of the free-fall winch.
For about one year, two duty cycle crawler cranes, type HS 8070, worked twenty-four hours, seven days a week. Each machine was equipped with a 23 m long boom as well as a dragline bucket with a filling capacity of 3 m³.
Every day about 16,000 t of sand and gravel were extracted from depths of down to 12 m. That means a turnover of approximately 330 t per hour and machine. The average diesel consumption was only 24-26 litres per hour.
“The complete design of the machine is very well thought out. We achieve excellent turnovers with an impressively low fuel consumption. That’s why the HS 8130 is the perfect machine for extracting gravel.”
Andreas Gran, Owner
The HS 8130 has a 23-metre boom and is fitted with a Hendrix dragline bucket 7 ½ HS with a capacity of 5.7 m³. At a digging depth of 8-10 m the duty cycle crawler crane manages 450 m³ of material per hour.
Thanks to the machine's optimized hydraulic system the size of the primary source can be reduced without negative impact on the turnover.
The efficiency is thus significantly increased while fuel consumption is decreased.
Special attention was given to the uncomplicated and economic transportation on all roads in accordance with current international transport regulations.
Thanks to minimum set-up work the machine can be quickly mobilized between jobsites so promoting economic deployment.