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一、本课题的提出液压支架在我国使用已有十年多的历史。架型由支撑式逐步发展到掩护式和支撑掩护式。由于架型的改变,使工作面的顶板控制状态得到了很大的改善。顶板事故明显降低,单产和效益大幅度提高。但是,架型的改革并没有完全杜绝工作面顶板冒落。据柴里矿、徐州及阳泉矿务局的调查,因顶板冒落造成工作面停产时数与总停产时数
First, the subject of hydraulic support proposed in our country has more than ten years of history. Shelves from the support of the progressive development of the cover and support cover. As the frame changes, so that the status of the roof of the control surface has been greatly improved. Roof accident was significantly reduced, yield and benefits increased significantly. However, the frame-type reform did not completely eliminate the roof caving. According to a survey conducted by Chaili Mine, Xuzhou and Yangquan Mining Bureau, the number of hours of shutdown and the total number of stopped production due to roof caving