1995年针对易门矿务局狮凤山矿持续均衡生产的需要 ,将凤山段主箕斗井向下延伸 1 58m,延伸后总提升高度为 4 0 0 m,在不改变主卷扬设备设施的前提条件下 ,设计提升能力 1 70 0 t/d;经多方面、多层次、反复论证、研究、比较 ,最终运用钢丝绳弹性伸长量可获得张紧力的原理 ,提出 In 1995, according to the need of sustainable and balanced production of the Yi Feng Mine in Yimen Mining Bureau, the main shaft of Fengshan section was extended downwards to 588m and the total lifting height after extension was 400m. Without changing the main hoisting equipment and facilities Prerequisites, the design of lifting capacity of 1 70 0 t / d; by many, multi-level, repeated demonstration, research, comparison, the ultimate use of elastic rope elongation can be obtained tension principle, put forward