Already starting to the crusher, should first idling for several minutes, can check base, idling protective plate chain, such as no abnormalities, can start feeding.

对已起动的破碎机，应先空转几分钟，空转时可以检查基座、防护板链等，如无异常，可开始给料。

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Through experiments, the improvement can reduce the content of minicrystal to 31.8 percent, compared with an original protective plate without a through hole for the cooled air to circulate.

通过试验，相对于原先没有用于冷却气体流通用的通孔的护板，该改进可以把微晶含量减少到31.8%。

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This paper mainly researches on the technique of draining long distance pressure relief gas in bed plate tunnel under the circumstance of mining protective coal seam.

本论文主要是针对远程下保护层开采条件下，对底抽巷上向穿层钻孔抽放远程卸压瓦斯技术进行了深入的研究。

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