Versatility and precision for narrow headings 14 Jan 2021

For drill+blast in narrow spaces, Sandvik has produced the DD212, a single boom electro hydraulic upgrade of the DD210. Developed specifically for narrow vein operations, it is productive, low cost, and requires 20% less time for boom positioning per face, has 15% improvement in drill penetration rate, and 3% improved pull out ratio. This translates into 10cm greater advance rate per face compared to similar equipment.

During site tests the machine reached 93% mechanical availability and performed 300 hours drilling within the 2.5 month operation with no rod jamming.

Special features of the DD212 include a new drilling control system - THC562 - with torque control and reaming hole selection, that enables the machine to provide increased drilling performance, yet reduces the wear on both the rock drill and rock tools; and a new intelligent boom - SB20i – for accurate hole electronic positioning enabling the precise and fast navigation of the drill feed and tool, with automatic parallelism and instrumentation for hole angle measurements. The boom offers large face drill coverage from 6m² to 25m², due to the 1m boom extension and the two narrow vein rotation actuators.

The development drill also has an extended 12ft rod and an RDX5 rock drill that provides fast drilling cycle time and low operating costs. The specific compact and versatile CFX telescopic feed can extend from 6ft to 12ft and enhances multipurpose operations in small 2.5m x 2.5m to 3.5m x 3.5m tunnel sizes. Face drilling can be performed with more accuracy, and in smaller tunnel segments, reducing overbreak, dilution and drilling costs.