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Multi Role Face Drill: Evaluation of the 2 Boom Face Drill in Australia Based on Swedish Design Criteria
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2017 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The 2 boom development face drill rig is originally designed for drilling blast holes. Currently in Australian mines the rig is utilised as a multi role face drill for drilling blast holes and rock reinforcement such as scaling, semi-mechanised bolting and meshing. The aim of the study is to understand if the machines produced today are what Australia demands.

It is important that the development is carried out in the most efficient way possible. There are a number of drilling methods and multiple factors to consider when choosing which method to use. One way of increasing the advance rate is to extend the rounds. A computerised control system allows longer rounds while maintaining the same advance per round. Longer rounds means however longer feeds on the face drill which in turn creates problems in other operations at the face.

Simulations of multi role equipment have shown that they can both increase and decrease the developed metres. The outcome of exchanging two or more dedicated equipment into one multi role equipment is a higher general availability but with limitations of having access to only one function at the time.

In a 2-, 3- or 4-heading scenario and if having set firing times in the mine and same length of the rounds and cycle times, then 2 multi role face drills can perform the same amount of work as 3 dedicated rigs. This is due to the time it takes for bolting and the fact that the total work cycle is longer than a shift.

Bolting with mesh and resin bolts is the longest cycle time, making it the bottleneck, and therefore focus should be to improve this. Utilising the face drill for scaling and bolting shows a significant increase of the unplanned breakdowns.

In regards to the new face drill that was recently released on the Australian market a lot of the factors causing unplanned breakdown have been improved. However, the hydraulic hoses are still exposed on the feed and will most likely continue to break if the rig continues being utilised as a multi role face drill.

In order to combine a computerised control system with a multi role face drill and at the same time maintain good availability, hoses, cables and sensors need to be protected or somehow eliminated from the boom and feed.

Place, publisher, year, edition, pages
2017. , 38 p.
National Category
Mineral and Mine Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-61238OAI: oai:DiVA.org:ltu-61238DiVA: diva2:1060338
External cooperation
Atlas Copco
Educational program
Mining and Geotechnical Engineering, bachelor's level
Supervisors
Examiners
Available from: 2017-01-23 Created: 2016-12-22 Last updated: 2017-01-23Bibliographically approved

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