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一、前言 英国煤炭工业目前正面临着低油价的竞争,这种状况将会持续多久,还难以预料。因此煤炭工业生存的关键是降低生产成本。 对生产成本有重要影响的是减少采煤工作面的数量,从1987年的650个减少到1986年3月的381个。 在1986年3月开工的381个长壁工作面中有88个工作面采用掩护式支架。平均日产量为1412吨,而用普通的液压支架的293个工作面平均日产量是880吨。相比之下效益是明显的,产量约提高60％。由于使用掩护式支架而取得了如此巨大的效益,因此替换旧的框架式强力支架是势在必行。
First, the foreword The British coal industry is currently facing competition from low oil prices, this situation will continue for how long, but also unpredictable. Therefore, the key to the survival of the coal industry is to reduce production costs. The significant impact on production costs is the reduction in the number of coalfaces, from 650 in 1987 to 381 in March 1986. Of the 381 long-wall workplaces started in March 1986, 88 work surfaces are covered by shields. The average daily output was 1,412 tons, compared to an average of 880 tons per day on 293 faces using standard hydraulic brackets. In contrast, the benefits are obvious, the output increased by about 60%. Because of the tremendous benefits achieved with the use of screen brackets, the replacement of old frame-style braces is imperative.