采煤专业毕业设计外文文献翻译--高效生产 — 一个关于采煤机截割的次序的问题
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1、 第 1 页 外文文献翻译 英文原文 High Productivity A Question of Shearer Loader Cutting Sequences 1 Abstract Recently, the focus in underground longwall coal mining has been on increasing the installed motor power of shearer loaders and armoured face conveyors (AFC), more sophisticated support control systems and
2、 longer face length, in order to reduce costs and achieve higher productivity. These efforts have resulted in higher output and previously unseen face advance rates. The trend towards “bigger and better” equipment and layout schemes, however, is rapidly nearing the limitations of technical and econo
3、mical feasibility. To realise further productivity increases, organisational changes of longwall mining procedures looks like the only reasonable answer. The benefits of opti-mised shearer loader cutting sequences, leading to better performance, are discussed in this paper. 2 Introductions Tradition
4、ally, in underground longwall mining operations, shearer loaders produce coal using either one of the following cutting sequences: uni-directional or bi-directional cycles. Besides these pre-dominant methods, alternative mining cycles have also been developed and successfully applied in underground
5、hard coal mines all over the world. The half-web cutting cycle as e.g. utilized in RAG Coal Internationals Twentymile Mine in Colorado, USA, and the “Opti-Cycle” of Matlas South African shortwall operation must be mentioned in this context. Other mines have also tested similar but modified cutting c
6、ycles resulting in improved output, e.g. improvements in terms of productiv-ity increases of up to 40 % are thought possible。 Whereas the mentioned mines are applying the alternative cutting methods according to their spe-cific conditions, e.g. seam height or equipment used, this paper looks systema
7、tically at the differ-ent methods from a generalised point of view. A detailed description of the mining cycle for each cutting technique, including the illustration of productive and non-productive cycle times, will be followed by a brief presentation of the performed production capacity calculatio
8、n and a summary of the technical restrictions of each system. Standardised equipment classes for different seam heights are defined, after the most suitable and most productive mining equipment for each class are se-lected. Besides the technical parameters of the shearer loader and the AFC, the leng
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