Sandvik Mining and Rock Technology has launched a new underground jumbo that, it says, is purpose-designed for fast and accurate drilling in tunnelling and cavern excavation.
The Sandvik DT1132i jumbo is the latest addition to Sandvik’s already extensive range of underground drill rigs. Together with the new high frequency rock drill Sandvik RD535 and rock tools designed for high speed drilling, it provides users with a heavy duty solution for their underground drilling needs, according to the company.
“All Sandvik DTi tunnelling jumbos have been developed with a special modular design that makes them highly flexible and versatile,” Sandvik says. “Suitable for fast face drilling or mechanised long-hole drilling and bolting, they are proving be highly productive, reliable and effective across the world.”
These rigs also use the latest developments in automated drilling solutions such as the iSURE® tunnel management software and SICA intelligent control system.
The new machine is a three-boom, electro-hydraulic jumbo. The computer-controlled rig can use both operator-controlled boom positioning and full-face automatic drilling functions, and also incorporates some of Sandvik’s latest developments in digital solutions. It comes equipped with Sandvik’s new high frequency RD535 rock drill, robust booms and advanced drill string guides, “making it a complete and new high-speed drilling solution”, Sandvik says.
The RD535 rock drill automated drilling features and new rock tools mean that that the DT1132i delivers the results required, but with 40% less exhaust particles, up to 20% higher penetration rate and with 25% more side coverage (3 x SB160i 190m2 -19,400m x 12,200m), Sandvik says.
The premise behind the development of the new DT1132i is to provide users with increased drilling performance and accuracy, thanks to its fast and adaptive drilling control capabilities, able to account for changing rock conditions. The rig design also maximises operator safety and ergonomics, with improved fleet standardisation (high parts commonality) enabling extended rig usage across different work sites.
Among the new features on the new rig is a 3 m telescopic TB160i boom, optimised with a front wrist structure that provides 1 m additional side coverage as standard, and 4 m side coverage with telescopic adjustment. The new boom also uses a new fully proportional boom control for accurate and fast manual boom handling, with intelligent compensation models to give accuracy in all operating conditions, according to Sandvik.
The rig also comes with an ergonomic vibration-dampened cabin, providing the operator with excellent all-round visibility, low noise level inside the cab – thanks to its acoustic windows – a filtration system to minimise dust inside the cab (according to standard EU6/7) and an open and spacious operator environment.
To further boost the efficiency of the rig and the operator, diagnostics information is integrated into one display. These include drilling diagnostics for boom instrumentation, drilling control system and shank lubrication, together with carrier diagnostics for electric motors, pumps (hydraulics and water), transmission system, diesel engines, brake system, jacks and cable reels.
Power and efficiency
The new RD535 rock drill has maximised power transfer capabilities leading to a high drilling speed without compromising hole quality, Sandvik says. It has an efficient and powerful patented percussion mechanism, as well as a tool-saving, efficient and patented stabiliser structure for increased reliability. These features, together with improved flushing and efficient cooling, provide uninterrupted high-speed drilling.
The DT1132i possesses a powerful transmission system with a Cummins B6.7, 168 kW diesel engine (Stage V) which can be operated up to 5,000 m above sea level without any modifications. The new engine provides up to a 90% reduction in NOx emissions (compared with stage III engines), with more than 90% mass reduction for diesel particulate monitoring. The rig uses a new carrier that has more efficient hydraulic and water systems – including separate circuits for both drilling and tramming hydraulics, proportional flushing valves to adjust the flushing flow and inlet/outlet pressure monitoring.
The rig steers by hydraulic rear wheel steering and its electric current reducer unit provides electric reactive power element from an on-board capacitor, reducing electric current draw by up to 20%. The 3 x 90 kW IE3 electric motors require 2.5% less energy, with all working lights based on LED technology, automatically controlled based on tramming direction and with directional lights available where needed, Sandvik says.
A new feed – TF535i – also provides increased feed force for high power drilling, while a saving hose reel structure gives longer service life for the hoses which are of an increased size.
The DT1132i is available with some of the latest developments in automation, including a SICA control system for intelligent torque control/feed percussion, with monitoring and fleet management for My Sandvik. To further improve the excavation process, remote access via WLAN can be chosen to allow web-based data transfer as well as online measurement while drilling.
As ‘Gold’ standard, the DT1132i comes with torque based semi-automated drilling, manual boom control and rod handling, all enabling drilling to a predefined depth with feed angle measurement and drill bit location measurement. Drill plan visualisation and rig navigation are also included. In addition to these standard features, the rig is also available as part of the ‘Platinum’ package with automatic long hole drilling and fully automatic face drilling.
New drilling tools
For face drilling, the DT1132i comes with the new Sandvik Alpha 360 drilling system for the RD535 rock drill. This has features such as an optimised rod diameter with increased flushing hole size, increased flushing and higher penetration rates, as well as a new Sandvik Alpha 360 connection. The latter possesses a new larger bit thread for increased drilling power and straighter holes which gives higher advance rate per blast. For grouting, the GT38 system provides 50% less deviation and increased service life.