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用手操作的液压支架,液压支架的初撑力是凭支架工的操作经验来保证的。但是由于操作时不注意,顶梁上和底座下的浮煤、浮矸、工作面中多架支架的操作等等原因,支架的初撑力往往就达不到额定值。据阳泉矿实测,实际初撑力只有设计的60～80%。为了充分发挥液压支架的支护能力,采煤机械化程度高的国家(包括我国)都在研制保证初撑力的液压系统。本文介绍英国伽立克公司的液压支架用初撑力保证阀,可以作为我国搞液压支架工作者的借鉴。
Hand-operated hydraulic support, hydraulic support initial support force is based on the operating experience of the stent to ensure. However, due to the operation is not pay attention, under the roof and the base of the floating coal, floating gangue, the face of the multi-stent operation and so on, the initial support of the stent often fail to reach the rated value. According to Yangquan mine measured, the actual initial support only the design of 60 to 80%. In order to give full play to the support capacity of hydraulic supports, countries with high degrees of mining mechanization (including China) are developing hydraulic systems that ensure initial support. This article describes the British Galick’s hydraulic support with the first support force to ensure that the valve can be used as a reference for our hydraulic support workers.