Keestrack: E-mobility in all performance classes

Keestrack displayed 9 processing plants and showcased the entire product range of tracked technology for mineral recycling and quarrying. The real leitmotif is the cost-effective hybrid and plug-in electrification of plant drives, which the company not only implements in new model generations and spectacular innovations, but consistently in all performance classes of its crushing, screening and handling solutions.

Keestrack E mobility

The star attraction was Keestrack’s most advanced and futuristic result of its sophisticated "e"-technology - the new track-mounted stacker S5e "Solar", which is probably the first directly solar-powered mobile processing plant worldwide; it also has a windmill stalled on top of it. Photovoltaic panels literally span like a sun sail over the 23-meter-long conveyor belt. With max. 9 kWh they feed the system battery with a capacity of 23 kWh, installed on the chassis. The conveyor belt (22 kW) and the tracks (2 x 15 kW) are directly electric-driven; an electric pump unit (2 x 15 kW) supplies the hydraulic lifting cylinders. If bad weather causes an insufficient photovoltaic power supply or intensive continuous operation exceeds the solar recharging capacities, the system can be powered or recharged via external sources such as upstream diesel-electric crushers and screens, or via mains plug-in.

Keestrack also presented for the first time, its jaw crusher Keestrack B7e, as the new 700-tph flagship, replacing the smaller B6. The plant’s core is the tried and tested single-jaw, jaw crusher CJ 412 with a 1200 x 830 mm inlet for feeding sizes up to 700 mm and a wide, hydraulically adjustable CSS range of 75 – 250 mm. In the B7e – only available as plug-in hybrid – the crusher is driven by a 132-kW electric motor. Another 55-kW electric motor powers the hydraulic system for the tracks, the lifting cylinders, the vibrating feeder with two-deck pre-screening and all conveyors. The entire diesel-electric power is delivered by the on-board Volvo diesel (optional 273 kW (EU IIIa) / 285 kW (EU IV) and the on-board 330 kVA generator. The engine house is available in a detachable drop-off module, to be positioned away from the crusher, in a dust and vibration-free environment.

High production capacities in secondary and tertiary crushing are guaranteed by the full hybrid cone crusher Keestrack H6e. With a maximum feed size of 215 mm, variable crushing chamber configurations and stroke settings (CSS: 6 - 44 mm) the specially adapted Keestrack KT-H6 based on proven Sandvik technology, processes up to 400 t/h of most various raw materials. Optionally, an efficient three-deck post-screen module (tot. 24.5 m² surface) with oversize recirculation provides high-quality end products, thus guaranteeing high added value.

Keestrack PREBauma2019

Keestrack also displayed its fully hybrid impact crusher R3e with single-deck post-screen and oversize recirculation (total 32 t), which was introduced last year. Also on show was the jaw crusher Keestrack B3e with new independent pre-screen. The electric-driven double-deck unit (1,6 m² + 1,2 m²) optimizes efficiency and wear of the 1000x600 jaw crusher, still being the largest unit within the 30-ton class.

Compared to conventional diesel-hydraulic units, diesel-electric driven plants directly save up to 40% of fuel. While working in production trains, the attributable fuel consumption may even decrease by 70% when the hybrid screeners are powered directly via the plug-out supply of an upstream or downstream diesel-electric crusher. To fully exploit this potential, Keestrack offers six models of its double-deck scalpers (250 - 1000 tph) optionally as full hybrid plug-in versions.

NBM&CW May 2019

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