在矿体尚未正式采掘以前,必然要开凿大量的准备坑道(包括探矿、运输、通风等坑道)而这些坑道大都是在独头掘进的条件下进行开凿的,其掘进深度常由数十公尺到数百公尺。因此,这些坑道通风情况的好坏,直接决定着坑道掘进时的纯作业时间和掘进速度,从而;也影响到采矿量的增长。根据不少书藉介绍和实际经验证明;在独头坑道内,最有效的通风方法,就是利用局部扇风机风筒。近几年来,由於在我们的矿坑内,普遍地采用了这种局部通风方法,使我们独头坑道内的通风情况,有着根本上的好转。但是;在我们的实际工 Before the ore body is formally tapped, it is inevitable to excavate a large number of trenches (including excavation, transportation, ventilation and other tunnels) which are mostly excavated under the condition of single-head tunneling. The tunneling depth is often controlled by several tens of meters To hundreds of meters. Therefore, the ventilation of these tunnels is good or bad, which directly determines the pure operation time and the speed of tunneling when tunneling, which also affects the growth of mining volume. According to a lot of books by the introduction and practical experience to prove; in the single head tunnel, the most effective method of ventilation is the use of local fans fan duct. In recent years, due to the widespread adoption of this method of local ventilation in our mines, the ventilation in our single-headed tunnel has been fundamentally improved. But; in our practical work