煤炭英语的翻译,急寻高手!Face Equipment: Powered SupportsThe application of modern powered supports can be traced back to the early 1950s. Since then, following its adoption in every part of the world, there have been countless models desig

煤炭英语的翻译,急寻高手!Face Equipment: Powered SupportsThe application of modern powered supports can be traced back to the early 1950s. Since then, following its adoption in every part of the world, there have been countless models desig
煤炭英语的翻译,急寻高手!
Face Equipment: Powered Supports
The application of modern powered supports can be traced back to the early 1950s. Since then, following its adoption in every part of the world, there have been countless models designed and manufactured in various countries.①But unfortunately there still is no uniform system of classification.
There are four types of powered supports, that is, the frame, chock, shield and chock shield, in order of evolution of their development. However, it must be noted that the trend of development in each type is such that it becomes less distinguishable in terms of application.②
Frame
The frame support is an extension of the single hydraulic props conventionally used underground. Thus it is the first type developed in modern self-advancing hydraulic powered supports. It involves setting up two hydraulic props or legs vertically in tandem that are connected at the top by a single or two segmented canopies. The two-segmented canopies can be hinge-jointed at any point between the legs or in front of the front leg. The base of the two hydraulic legs may be a circular steel shoe welded at the bottom of each leg or a solid base connecting the legs are used to increase the stability.
Generally a frame support consists of two or three sets of hydraulic legs. The set that moves first is the secondary set, the set that moves later is the primary set. There is a double-acting ram installed between each set. The pistion of the ram is connected to the secondary set and the cylinder to the primary set. During support advance, the primary set is set against the roof while the secondary set is lowered and pushed forward by the pistion. Having reached the new position, the secondary set is set against the roof while the primary set is lowered and pulled forward by the cylinder. ③The distance of each advance ranges from 20 to36 in.(0.05～0.91m).
Thus the frame support is very simple, but more flexible or less stable structurally. There are considerable uncovered spaces between the two pieces of canopy, which allows broken roof rock to fall through. Consequently the frame support is not suitable for a weak roof.

煤炭英语的翻译,急寻高手!Face Equipment: Powered SupportsThe application of modern powered supports can be traced back to the early 1950s. Since then, following its adoption in every part of the world, there have been countless models desig
面对装备：液压支架
应用现代液压支架,可以追溯到20世纪50年代初.自那时起,通过之后,在每一个世界的一部分,有无数的模式,设计和制造各个国家. ①但可惜的是,没有统一的分类系统.
有四种类型的液压支架,也就是框架,轴承座,盾牌,盾牌座,在秩序的演变它们的发展.但是,必须指出的是,发展的趋势,在每类是如此,它成为少区别而言的应用前景. ②
帧
该框架支持,是一个扩展的单体液压支柱道具常规使用的地下.因此,它是第一种类型发展现代自移液压动力支持.它涉及到了两个液压道具或腿在垂直串联是连接在顶部由一个单一或两个分割的檐篷.两个分割的檐篷,可铰链连接,在任何点之间腿还是在前线的前线腿.该基地的两个液压腿可能是一个圆形钢擦鞋焊接在底层的每个腿或奠定了坚实的基础,连接腿是用来增加稳定.
一般帧支持连续两个或三套液压腿.一套动首先是中学设置,设置动作后,是首要的.有一个双作用的RAM安装之间,每套.该活塞的RAM是连接到中学设置及调节器,以小学设置.在支持前进,首要的是一套一套针对屋顶,而二手设,是降低和推动的,由活塞.因达到新的位置,中学组是一套针对屋顶,而小学组是降低和拉动由缸. ③距离,每提前不等,从20 to36英寸（ 0.05 〜 0.91米） .
因此帧的支持非常简单,但更灵活或较稳定的结构.有相当大破获位之间的两块巨型天篷,使破碎顶板岩石,以告吹.因此帧支持,是不适合弱屋顶.