由上海煤研所设计、北京煤机厂生产的zy35型液压支架三套共300架,已在西山矿务局正式投产使用。zy35型液压支架属于四柱支撑掩护式,工作阻力400吨/架,初撑力188.4吨/架,适用于煤层厚度2～3.3米,倾角小于30°的缓倾斜采煤工作面。这三套支架是81年3月至5月到矿上的。由于矿厂双 Designed by Shanghai Coal Research Institute, 300 sets of three sets of zy35 hydraulic supports produced by Beijing Coal Mining Machinery Factory have been put into operation at Xishan Mining Bureau. Zy35 hydraulic support belongs to the four-post support screening, work resistance 400 tons / frame, initial support force 188.4 tons / frame, suitable for coal seam thickness of 2 ~ 3.3 meters, dip less than 30 ° gentle inclined mining face. These three sets of brackets were mined from March to May, 1981. Due to the mine double