MATERIALS HANDLING
Eti Bakir is Turkey’s most productive mine
electric motor, gearbox and frequency converter,” he says. “Our conveyor drive needs very little maintenance at all, and it’s easily planned hydraulic maintenance that can be done without any problem.”
The mine shaft is 600m deep and is where all of the ore exits
HIGH PRECISION, LOW DRIVE MAINTENANCE Naturally, the drive solution has had immediate benefits as well. Te fully variable speed, combined with automation, allows Eti Bakır to use Küre’s bucket lifting system to the fullest. “Te drive system interfaces with our
upper-level automation, and the variable speed lets us stop the conveyor exactly where we want it to stop,” says Küçükateş. “We can run the conveyor at 0.35m/s up to a first weighing point, for example, then continue moving it at 1m/s to stop at a second weighing point. Ten, if our control system gives the approval for the load, the speed can be increased to 3m/s for loading into the bucket. Afterwards, the cycle begins again.” Küçükateş notes that this would be difficult to achieve with an electromechanical drive system. Not only would it be complex, the solution would also require far more maintenance. “Hägglunds systems need less maintenance than a system with an
ALWAYS MOVING – EVEN WHEN OVER-LOADED What Eti Bakır is most keen to avoid is an expensive production stop, caused by an unpredicted failure. Although the company keeps an additional Hägglunds motor and hydraulic pump in stock at the Küre mine, no unplanned stops have occurred since the drive system was commissioned in 2015. Tis is a notable contrast to previous conveyor drive solutions. “We used to drive long belt conveyors with gearboxes and hydraulic couplings,” says Küçükateş. “Tose systems had problems once a week, which negatively impacted our transportation of ore. Sometimes a conveyor would become overloaded, and the old systems didn’t have enough torque to get started at low speed. We would have to empty the conveyor with shovels before it could move, which led to big production losses.” With the Hägglunds drive solution, things could not be more different. Because of the drive’s high starting torque, which can be maintained for an unlimited time, moving a belt conveyor is no issue – regardless of the speed and load. “If the conveyor is overloaded, we can switch the drive into manual mode to solve the problem,” says Küçükateş. “Using the infinitely variable speed, we can move ore into the bucket at
any speed we need to. We can load the bucket without failure, and the bucket itself is neither overloaded nor underloaded.”
A DRIVE SOLUTION WORTH REPEATING Based on the high reliability, Eti Bakır has continued to invest in Hägglunds conveyor drives. With the Küre mine growing deeper, a new belt conveyor was added at 475m depth in 2021. Like the conveyor in the main shaft at 200m depth, this one is powered by a Hägglunds hydraulic solution. Moreover, Eti Bakır has taken the drive concept beyond Küre. “Eti Bakır has invested in a new
underground mining site in Siirt, where the ore is also being lifted from a shaft,” Küçükateş explains. “We’ve chosen a Hägglunds drive system again, because we know the solution works without issue and meets our requirements when it comes to automation. I know, for sure, that we can always reach our daily goals regarding the tonnage to be transported.” “I’m convinced that long belt
conveyors require an alternative solution to traditional drives,” Küçükateş concludes. “Whenever we invest in a new underground mine with a shaft, we’ll be using Hägglunds again.”
Ananda Wunschel is with Hägglunds.
www.hagglunds.com
www.engineerlive.com 45
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