AUTOMATIC CONTROL OF DRILLING JUMBOS
A prototype computer-controlled twin boom, crawler based drilling machine has been built for use underground by British Coal. The main problems during initial testing were associated with the unreliability of the control system, reduced drill unit performance, operational hydraulic circuit problems and poor component accessibility. These were much improved by modifications made to the machine. In September 1987 the machine was installed underground at Bentley Colliery, where it operated under production conditions on 3 shifts for some 6 weeks. Continual control system problems and hydraulic system malfunctions resulted in the machine being taken out of use. The percentage of drill and fire headings has fallen from around 25% in 1980 to less than 11% by 1988. The applications potential for this machine is restricted to short drivages, steeply inclined drifts or cross-measure roadways with compressive strengths above 120 MPa.
Bibliographic Reference: EUR 12511 EN (1990) 96 PP., MF, ECU 4, BLOW-UP COPY ECU 12.50 AVAILABLE FROM THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
Record Number: 1989128041700 / Last updated on: 1990-11-09
Available languages: en