在大跃进中,大连水泥厂首先在石灰石矿山采用漏斗开采法。他们的做法是根据山形决定竖井中心和运输方向,然后在山脚适当地点选定峒口,由此向竖井中心开凿一条平峒,沿竖井中心线由上而下开凿一个竖井,井底设有工作平台及溜子闸门。开采时即以竖井为中心,在保证矿石自由滑落的边坡范围内,由上而下,等半径地在四周进行穿孔爆破,因此竖井上端永远呈漏斗状;愈往下开,漏斗愈大。爆破下来的矿石即沿漏斗边坡溜入竖井而落到井底,通过溜子闸门自动装入矿车,经平峒运 During the Great Leap Forward, Dalian Cement Factory first adopted funnel mining method in limestone mines. Their approach is to determine the shaft center and the direction of transport according to Yamagata and then select the ridges at the foot of the hill, thereby creating a flat ridge at the center of the shaft and drilling a shaft from top to bottom along the shaft centerline, Platform and slip gate. When the mining is taking the shaft as the center, perforation blasting is carried out from top to bottom, radius and so on around the slope where the ores are guaranteed to slide freely, so that the upper end of the shaft will always be funnel-shaped; Exploded ore that is, along the funnel slope slides into the shaft and fell to the bottom of the hole, automatically through the sluice gate into the car,