Keestrack hybrid H6e cone crusher
Benefits include longer life, lower maintenance costs and higher resale value
The new 62-tonne H6e cone crusher is capable of processing 400 tonnes per hour with an innovative hybrid diesel-electric drive, while also being compact and easy to transport. With a maximum feed size of 215 mm, and variable crushing chamber configurations and stroke settings, the H6e offers a wide CSS range from 6 to 44 mm.
The crusher is driven by a 220-kW electric motor. The lubrication system, the hydraulic Hydroset control with overload cut-out, and the air compression of the crusher housing are powered by separate electric motor/pump units.
A 345-kW Volvo diesel engine with a connected 500-kVA generator supplies the onboard energy. The generator is remotely located from the crusher. The drive unit is a removable module similar in design to the smaller H4e, which allows for the power supply to be placed in a less dusty and abrasive location, reducing maintenance costs. It can also supply power for secondary equipment. The crusher's operating functions remain active, including the 63A connector for add-on screening units or stockpile conveyors.
The Keestrack H6e also provides plug-in power supply from the mains or an additional generator, making it possible to reduce direct energy costs by up to 70 percent.
"During ‘plug-in' operation (external gen set/mains) the diesel engine doesn't have to be started, and complete energy management is controlled automatically, including the electric supply of a secondary unit such as a screener or stacker," explained Daryl Todd, president of Frontline Machinery, which sells and services Keestrack crushers.
The electric hybrid system on these crushers helps operators reduce costs in several ways, Todd explained. Fuel use is significantly reduced - along with emissions, especially when plugged into the mains. Since the majority of maintenance is related to engine operations, moving from diesel to electric power reduces cost and downtime.
Production is greater when using electric power, as diesel engine surging is removed from the equation.
Todd also noted that hybrid crushers have a longer life than other units.
"Hybrid engines have an increased life expectancy up to 40 percent longer than diesel engines," Todd noted, adding that "hybrid units achieve 15 to 20 percent higher resale prices on the market compared to standard units."
All crusher functions are incorporated into the central Keestrack PLC controller, which enables excavator or wheel loader operators to run the crusher by means of a remote control unit. Keestrack-er, an optional satellite-based telemonitoring system, documents the crusher's key performance data in real time, alerts the operator to any malfunctions and collects the current production data if an optional belt-scale is installed.
A 1200-mm-wide, hydraulically driven belt feeder with integrated metal detector feeds material from the 8-cubic-metre hopper (a 12-cubic-metre hopper is available). A load-release device provides equal distribution of the feedstock to a maximum 400 tph. The main discharge conveyor has an 11-kW electric-drive motor and reaches a drop/transfer height of 4,800 mm, offering a stockpiling capacity of 350 tonnes without post-screening.
The optional H6e post-screen module, with a total screening area of 24.5 square metres over three decks, guarantees high production rates, including oversize material recycling. The screen box has a sensor-monitored hydraulic drive.
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