镜铁山矿2640水平主溜井到破碎场,采用20吨架线电机车牵引6米~3底卸式矿车进行矿石运输。1号底卸式曲轨安装在破碎场的卸矿槽上部。当列车以1米/秒的速度通过该曲轨时,只需一分钟时间就将一列车的100～150吨矿石全部卸入矿槽。这是一种能力大、卸矿速度快的卸矿方法。但当时它在国内系初次设计, Jingtishan mine level of 2640 primary slip well to the crushing field, the use of 20 tons of overhead locomotive traction 6 m ~ 3 at the end of the demolition of ore transport trucks. No. 1 bottom unloading curved track installed in the crushing field at the top of the unloading tank. When the train passes the track at a speed of 1 m / s, it takes only a minute to load 100 to 150 tons of ore from a train into the mine. This is a large capacity, unloading fast unloading method. But when it was first designed in the country,