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‘Long-reach’ rig on show at Steinexpo 99 <BR> The ROC D7 - the smallest of Atlas Copco’s new crawler rigs - makes its European debut at the Steinexpo 99 exhibition in Wülfrath, near Düsseldorf, Germany, where exhibits will be demonstrated in action at a quarry. The rig has exceptional climbing ability, makes swift progress over difficult terrain, and has a unique round boom concept which gives an extensive reach. Here its shown in a cabin version.

Steinexpo is an important venue for the quarrying industry – at the 1996 show, 93 per cent of visitors were from the trade. This year’s exhibition, from June 9 to 15, will have over 100 exhibitors in its 90,000 sq.m area and more than 50,000 visitors are expected.

The ROC D7 is designed for quarry and construction site drilling in the 64-102 mm (2 1/2"-4") range and there is a choice of engine. It can be powered by either a CAT 3116 DITA, with a rating at 2,200 rpm of 147 kW (200 hp), or a Deutz BF6M 1013EC, with a rating at 2,200 rpm of 152 kW (207 hp). Both engines are water-cooled and turbo-charged.

New boom system

The folding-boom reach on the ROC D7 covers an area of up to 15m2 (161 sq. ft.). The long-reaching round boom is light, rigid and flexible and the system provides a stable and fast set-up, hole quality and good accessibility for servicing. The folding boom has a swing of 25° right and 35° left and expanding shafts at all the boom joints make it simple to maintain stability throughout the system.

The unique aluminium cylinder feed system ensures smooth and controlled feeding with the drill bit always in contact with the rock, contributing towards long drill steel life at low cost, a high penetration rate and higher productivity.

The new rig is equipped with COP 1800 series (COP 1838 ME/HE) rockdrills and is suitable for T38, T45 and T51 drill steel. A double drill steel support gives perfect guidance for fast and safe collaring, resulting in straighter holes, lower drill steel costs and easier blasting.

Excellent flushing is achieved with the Atlas Copco C 106 on-board screw compressor, which can deliver 105 l/s at 10.5 bar.

Optional cabin

The D7 can be delivered with or without a cabin. If an operator’s cabin is the choice, it is spacious and ergonomically-designed to provide an efficient and comfortable workplace. The controls are in the armrests of the six-way adjustable seat, there is an excellent overall view for drilling and collaring and the cabin itself is FOPS/ROPS approved as a safe working environment. In addition, large panoramic windows provides for maximum visibility and the front window is angled to avoid dust and oil accumulating on the glass.

Winching, tramming and boom positioning are remote controlled and the winch is located in the centre of the rig. In addition, a rigid, sliding hydraulic support leg is designed for use when tramming and climbing.

Other optional equipment available for the new rig includes a water-mist system for hole stabilisation, an air conditioner/heater unit, a toe-hole drilling kit, electric refuelling pump and an electronic inclination instrument.

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Photo no: 201968, 201132