液压支架

中文字数:3848,中文页数:05 英文字数:2240页数:06

 液压支架被用来支护工作面顶板。他们在立即前移支护系统里通常从事以下几步工作，为了尽可能快地支撑新暴露空间。在正常的支撑重要条件下，支架的顶梁是通过立柱的支撑阻力紧紧地靠着来阻止顶板岩层。当切割和通过几个支撑单位超过支架时，立柱降柱和向前移动一段距离，通过液压推进油缸的缩回来达到与切割的深度相等。推进油缸靠在工作面输送镏槽上，它的位置是通过支架的推进油缸的推进力来保持不变，作用在支架的两边。支架一推进到设计的位置，支架就立即重新靠在顶板上。最后，支架的推力油缸试图向前推进输送机和为下一次切割做准备。

 Powered roof supports are used to support the roof at the face.They work in several steps mostly in the immediate forward support (IFS) type in order to support the newly exposed roof as soon as possible. In normal supporting condition the canopy of the support is set tightly against the roof strata,by the supporting resistances of the hydraulic legs. When the cutting machine cuts and passes several support units beyond the support in question, the support legs are lowered and pulled forward for a distance equal to the width of cut (web) by retracting the hydraulic advancing ram. The advancing ram acts against the face conveyor panline, whose position is held unchanged by the advancing rams, forces of the supports that are set on both sides of the support to be advanced. As soon as the support has been advanced to the designed position, the support is immediately reset against the roof. Finally, the advancing ram of the support in question is extended to push the conveyor forward and becomes ready for the next cut.

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