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由北京煤矿机械厂研制的BY300-11/28型掩护式液压支架在鸡西矿务局小恒山矿使用成功,通过了有关部门的技术鉴定。该支架工作阻力为2208.8～2726.4 kN,初撑力为1632.4～2014.8kN,支架中心距1.5m,支护强度为444.4～551.3kN/m~2。移架步距600mm,采用单伸缩机械加长式立柱,设计时广泛采用了国外同类产品的优点,并结合我国的地质条件设计的一种新型支架。设计中采用了长顶梁,单伸缩机械加长立柱,扁宽型槽板结构等较先进的支架结
The BY300-11 / 28 type hydraulic shield, developed by Beijing Coal Mining Machinery Factory, was successfully used in Xiaoshan Mine of Jixi Mining Bureau and passed the technical appraisal of relevant departments. The working resistance of the stent is 2208.8 ~ 2726.4 kN, the initial support force is 1632.4 ~ 2014.8kN, the center distance of the stent is 1.5m and the support strength is 444.4 ~ 551.3kN / m ~ 2. The moving step is 600mm. The single extension telescopic extension column is adopted. The design adopts a wide range of advantages of similar foreign products and a new type of stent designed according to the geological conditions in China. The design uses a long-top beam, single telescopic extension columns, flat wide slot plate structure and other more advanced knot