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山西省鹊儿山煤矿是一个年产30万吨的矿井。在过去的一个很长时期内,该矿的局扇和掘进工作面一直采用并联供电。由于电压严重降低,使局扇被迫停止远转,造成掘进工作面瓦斯集聚,而此时工作面上机电设备继续运转,所以极易发生瓦斯事故。1980年就曾在一个月里连续发生两起瓦斯爆炸事故,对安全生产造成了极大的威胁。按照《煤矿安全规程》的规定,煤矿井下有局扇的地方,须安装风电延时闭锁装置。但是,目前这种装置尚无定型产品。该矿职工经过努力,组装了一种晶体管风电延时闭锁装置,每套仅需20元。经和QC83—80型隔爆开关配合使用,效果良好。局扇和掘进工作面的供电如图1:
Shanxi Magpie Hill Coal Mine is an annual output of 300,000 tons of mines. For a long time in the past, the mines’ fans and headings had been powered in parallel. Due to the serious reduction of the voltage, the local fan was forced to stop for a long time, resulting in the gas accumulation in the driving face. At this time, the mechanical and electrical equipment on the working face continued to operate, so the gas accident could easily occur. In 1980, there were two successive gas explosion accidents in a month, which posed a great threat to safety in production. In accordance with the provisions of the “Coal Mine Safety Regulations”, coal mines have fans outside the place, to be installed wind power delay blocking device. However, at present, this device is not a fixed product. The mine workers worked hard to assemble a transistor wind power delay locking device, each only 20 yuan. The QC83-80 flameproof switch with the use of good effect. Bureau fans and driving face power supply in Figure 1: