HIGH GRADE MOBILE CRUSHING WITH THE KEESTRACK H6e CONE CRUSHER
Keestrack, international specialist in mineral processing technology, continue to expand its range of track mounted machines designed to manufacture high-grade final grain products. Similar to the Keestrack H4e introduced in 2016, the new 62 tonne fully hybrid H6e cone combines this leading crushing technology together with an innovative diesel electric drive concept, enabling full flexibility at maximum cost efficiency.
A Productive Concept The successful launch of Keestrack’s fully hybrid H4e cone crusher (46t/250tph) has been followed by the Keestrack H6e 400tph model, which again guarantees a high level of mobility thanks to is compact design, economic productivity, efficient transport, screening module and options allowing for a broad range of applications.
The proven cone crushing technology with variable crushing chamber configurations and stroke settings enable the Keestrack KT-H6 to offer a wide CSS range (6-44mm), while the drive and control technology have been specially adapted in-line with the Keestrack hybrid concept. The crusher is driven by a 220kW 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 motors/pump units.
This drive system is incorporated into the central Keestrack PLC controller allowing excavator or loader personnel to operate the machine by means of a remote control unit.
A 345kW Volvo diesel engine with a connected 500kVA generator supplies the on-board energy. The entire drive unit is designed as a removable module that, when located remotely from the crushing plant, reduces dust and vibration levels, facilitates easy maintenance access which in turn, optimises and lengthens the service life of the drive unit. All the crusher operating functions remaining active, including the 63A connector for add on screening units or stockpile conveyors. The H6e also offers plug-in power supply from the mains or additional generator as standard, making it possible to reduce direct energy cost by up to 70%!
Efficient Components The size and capacity of all charging and discharging equipment is geared accommodate the high capacities of the aggregate crusher and, like the track drive, hydraulic cylinders and other hydraulic components (motor/engine fans) are powered via the load-sensing operating hydraulics by two 30kW electric motors. The unit is operation/cost sensitive as the volume of the hydraulic fluid can be reduced to 120L thanks to use of the new hybrid concept, cyclone extraction technology and the generally good cooling characteristics of the largely, steel piped hydraulic system.
A 1200mm wide hydraulically driven belt feeder with integrated metal detector feeds material from the 8m³ hopper, with load-release device for the equal distribution of the feedstock (max. 400 t/h). The main discharge conveyor has an 11kW electric drive motor and reaches a drop/transfer height of 4,800 mm, offering a stockpiling capacity of 350 tonnes without post-screening.
With a total screening area of 24.5m² over three decks, the optional H6e post-screen module guarantees high production rates including oversize material recycling. The screen box has a sensor-monitored hydraulic drive, with all belts powered by maintenance-friendly electric drum drives. Providing large stockpiling capacity during operation, the discharge conveyors can be fully retracted hydraulically to under 3000mm overall width for transport.
Impressive demonstration During its world premiere at the Keestrack Innotech Demodays 2017 held in Spydeberg, Norway in mid-October, the Keestrack H6e was demonstrated over several days in a granite quarry. Loaded directly with coarse aggregate and working in-line after a Keestrack B4e jaw crusher, the unit demonstrated its value as an efficient stand-alone production machine and as a high-capacity secondary crusher for high-grade, precisely defined final grains. While operating secondarily, the Keestrack H6e produced up to 200tph of final grains the size of 0/8; 8/16; 16/22mm. The feed material for the machine combination was granite 0/700 – overall throughput of pre-crushed 0/150(X)mm of the H6e was approximately 240tph in closed circuit consuming an average of 45 litres per hour in diesel-electric operating mode.
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