国内外回采工作面单体支护装备的发展大体经历过木支柱→单体金属摩擦式支柱→单体液压支柱几个阶段。上世纪80年代出现的单体液压支柱具有初撑力高、恒阻、承载力均匀、升降柱速度快等特点。它已成为我国煤矿不可缺少的支护产品。目前全国各煤矿使用DZ型单体液压支柱在100万根 At home and abroad mining face monomer support equipment development generally experienced wooden pillar → single metallic friction props → single hydraulic prop several stages. The hydraulic props that appeared in the 80s last century have the characteristics of high initial holding capacity, constant resistance, uniform bearing capacity and fast lifting column speed. It has become an indispensable support product for China’s coal mines. At present, all types of coal mines in the country use DZ single hydraulic props at 1 million