一、问题的提出煤矿井下支柱的回收和再利用是降低产煤成本、节约材料消耗的重要途径之一。回柱的方法多种多样，但无论用何种方法，回柱设备都必须能够提供足够大的牵引力，且设备本身应具有结构尺寸小，重量轻，便于搬移等优点。我们设计的一种新型回柱器为：将一减速器悬挂 First, the issue raised Coal pillar recovery and reuse is to reduce coal production costs, material consumption savings one of the important ways. There are many ways to return to the column, but no matter which method is used, the column equipment must be able to provide sufficient traction, and the device itself should have the advantages of small size, light weight, easy to move. A new type of backhoe we designed is: Hang a reducer