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最近发表的一些专题报导表明,工作面支护技术已达到很高的水平。尤为突出的是,近年来掩护支架取得了迅速发展。 从图1中看出,1982年掩护支架工作面的产量已占西德煤炭总产量的85%。从座标曲线中还可看出,过去所用的每一种支架,当其使用数量达到很大的数值时,就会出现一种新型支架,而在掩护支架广泛应用之后尚未出现一种新型支架。
Some recently published special reports show that face support technology has reached a very high level. Particularly prominent is the rapid development of shields in recent years. As can be seen from Figure 1, the production of shield supports in 1982 accounted for 85% of the total output of West Germany coal. As can also be seen from the graph of coordinates, a new type of stent appears when each of the stents used in the past reaches a very large number, and a new stent has not appeared after the widespread use of the screening stent .