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Sixty-eight face ends were included in an assessment sheet campaign to investigate the effects of different approaches to face end configurations on major target parameters, such as face advance and convergence. A database was installed and the data were evaluated by means of an extensive variance analysis. In order to improve the face end situation in the main gate of dipping faces, the possibility of operating AFCs and coal ploughs by single drives was studied. Single drive operation provides considerable safety improvements. To improve the design of face/gateroad transitions at reduced costs, the AutoCAD system was used to install extensive component bases which are able to be displayed, varied and optimised on a PC for various face end alternatives. The VME roadheader was tested on the rig for face end simulation at the Mining Engineering Division of the Bergbau-Forschung GmbH. The tests helped to widen the application range of the machine. For comparative assessment, all three available face measuring systems were logged. Positive experience was gained with the absolute measuring systems "AFME" and "SSZ2", and among the systems for relative measurement, the Reed contact chain proved its usefulness. A strain gauge was developed for use with the DMS method to determine the loads on roof bolts. After comprehensive test work it was possible to reduce the measuring error to +/- 2%. This instrument can be reused and is suitable for any current type of bolt.

Additional information

Authors: WIECHERS K P, Bergbau-Forschung GmbH, Bochum (DE)
Bibliographic Reference: EUR 13009 DE (1991) 237 pp., MF, ECU 12, blow-up copy ECU 30
Availability: (2)
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