E-mobility in all performance classes

By MEq August 27, 2019 18:57

Keestrack displayed a total of nine processing plants at Bauma 2019 and showed the entire product range of tracked technology for mineral recycling and quarrying.

Complete E-portfolio in mobile crushing
Including two successful 30-ton crushers, Keestrack exhibited this year all flagships of its track-mounted jaw, impactor and cone crusher series as diesel-electric full hybrid plug-in systems. According to Keestrack, the new and enhanced models are not only class leaders for 60 to 70 tonnes transport weight in terms of size, output, product quality, and variety, but are also setting new standards for cost-efficient operation with their sophisticated drive concepts. Without restrictions in transportability and tracked on-site mobility, Keestrack’s diesel-electric heavy crusher range meets both the requirements for volume-intensive recycling jobs on construction sites as well as for flexible multi-stage production of mineral aggregates in pits and quarries.

For the first time internationally on show, Keestrack presented the jaw crusher Keestrack B7e, as 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 a 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. Thanks to constant and low engine speeds, even under full diesel-electric load, the Keestrack B7e operates with low fuel consumption. According to Keestrack, energy-saving costs of up to 80% can be obtained in emission-free plug-in operation from mains or external gen sets. The plant with a total weight of just under 69 t (with options) is highly mobile: by detaching the 6m³ feeder unit incl. pre-screening, the weight drops below 60 tonnes.

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. The powerful e-motors for crusher drive and plant hydraulic (220 kW / 2 x 30 kW) and all other directly electric-driven components are powered by a detachable diesel/generator module (345 kW / 500 kVa) or plug-in via mains or external gen set. With only 62 tons total weight with all options (51.5 t without final screen), the large cone can be operated economically at various jobsites.

This versatility is also the success of the impact crusher Keestrack R6e as compact and highly mobile “1300” with double pre-screening and double-deck post-screen module incl. oversize recirculation. Still being also available as diesel-hydraulic as well as partially electric with crusher direct drive (“rotor-by-diesel”), Keestrack shows the R6e in Munich as a fully hybrid plug-in version (439 kW/ 550 kVA). Despite its extensive electrification, including the 970×1300 mm crusher (250 kW), the hydraulic system (2 x 55 kW), almost all conveyor drives and ancillary units, the 62-t-plant can be flexibly dislocated with the optional dolly-system.

Particularly sensitive are transporting weights for compact all-rounders of the 250 to 300 tph class. Here, Keestrack 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 1000×600 jaw crusher, still being the largest unit within the 30-tonne class. The electrical equipment of the predominantly diesel-hydraulically driven plant includes a 42.5 kVA generator for all conveyor drives and ancillaries and the 16A plug-out connection for downstream screens or stackers.

Save by combining
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 today six models of his double-deck scalpers (250 – 1000 tph) optionally as full hybrid plug-in versions.

New to the “e”-programme is the scalper Keestrack K6e: With 8 m³ standard feeder, 4500 x 1800 mm double-deck screen box (2 x 8.1 m²) the nearly 30-tonne plant produces three fractions with 600 tph and can be adapted to a wide range of materials and applications with a variety of screen media and additional equipment. A full hybrid screen solution with high potential for economical semi-stationary operation from mains is the Keestrack K5e Flip Flow (approx. 29.5 tonnes). The specially adapted BIVITEC technology in the large double-deck screen box provides a wide range of applications in the economic recycling of residual materials (glass, wood, slag, etc.) or the processing of difficult materials with high basic moisture. The flexible screening equipment also allows the efficient and economical production of minimum grain sizes of <2 mm, handling hot materials (eg slag) or generally the production of large quantities of mineral standard products (up to 450 tph).