From 03.- 04.09.2010 the exclusive German-based Metso distributor of crushing and screening equipment, APEX-Lieben, celebrated the opening of larger business premises just under a kilometre from the old site as the crow flies. At the opening, invited guests were also able to admire Metso’s new mobile screen – the Lokotrack ST3.5. It is the first of this new model of screen to be shown on German soil. Not only the type name ST3.5 (3 stands for the number of products/doubledeck screen; 5 for the screen width – corresponding to around 1500 mm (5 ft)) differs from the predecessor model – the tried and tested ST352. A string of technical modifications to the screen improve its efficiency and environmental friendliness. Precondition for this is the improved combination of high-efficiency circular vibrating screen, selected quality components and the proven Lokotrack structure.
It is powered by a CAT C4.4, which with around 75 kW may seem oversized at the first glance. But it makes sure that the operator has adequate drive power even when working in the toughest and most difficult conditions. Besides the new engine, the hydraulics were optimized with a triple fixed displacement pump. As a result, the fuel consumption is around 33 % lower than for the predecessor model. The facilities for remote control (cable or radio) are still available, but manual operation of the screen is still the first choice for most operators. The intelligent arrangement of filter and the design of the engine casing optimally protect the drive system against dust.
For set-up, dismantling and transport of the screen, there are reliable fixtures and operating functions: the operating levers for the hydraulic folding of components during the set-up of the mobile screen are, for example, arranged so that the motional processes remain clearly visible (Fig. 1). This also includes the obligatory platform at the screen and an ample clearly labelled emergency stop switches. Good accessibility of lubrication points, maintenance points as well as for changing the screen meshes reduce downtime and increase working safety. The screen frames of the doubledecker with 5.3 m² screening area are suitable for fitting different screening surfaces. The same size of the screen meshes on the two decks enables economic storage.
The ST3.5 is suitable for excavator or wheel loader feeding and can be operated both as a stand-alone component and with upstream and downstream equipment – e.g. with high-performance Lokotracks – in a closed circuit (Fig. 2). For this, longer discharge belts are available as an option, with which larger volumes can be stockpiled. For environmental friendly operation near residential areas, numerous options are available, such as dust covers for the feed and fines conveyors and water spraying with minimal water consumption. Customized modification in line with specific working conditions is available ex works. In future a double-deck vibra-ting grate will be available for mounting on the feed bin to ensure efficient pre-screening.
APEX-Lieben GmbH CRUSH & SCREENTEC,
Geilenkirchen (D), Tel.: +49 2451 4095-884,