Atypical and innovative tool, holder and mining head designed for roadheaders used to tunnel and gallery drilling in hard rock

摘要

The paper deals about atypical and innovative solutions of mining cutting tools, their holders and mining heads designed to drilling galleries and tunnels in hard rock using roadheaders. If standard tools tangential-rotary picks and milling heads are used, hard rock mining usually leads to quick and significant wear of mining tools. In Department of Mining, Dressing and Transport Machines, AGH UST in Krakow innovative and atypical mining tools were developed crown picks and asymmetrical mini disk tool, especially for hard and very hard rock mining. For cutting tools (both standard and new type) a special solution of lubricated holder was also developed, allowing to facilitate and increase the number of pick rotations in the holder, as a consequence, reducing wear of the tool. The results of laboratory tests, obtained with new solutions of tools and holder, were described. On the basis of received results new solutions of mining heads were developed and manufactured. The prototype of mining head with crown picks, mining head with lubricated holders, and mining head with disk tools with complex motion trajectory were described and presented. Series of field tests, using new mining heads, were described. Final results and conclusions were presented.