摘要
硬质大块煤是影响放顶煤开采后部工作面煤流输送和顶煤回收的重要因素。为提高后部大块煤的破断效率,分析研究了乳化液冲击破碎锤的系统结构及破块性能,设计了尾梁插板内置式和尾梁下表面贴附式2种布设方案并进行了分析比较。对伸缩千斤顶拖动破碎锤挤压、冲击破碎大块系统进行了地面试验,单次冲击下实现了0.5m规格尺度大块混凝土的整体破断。分析和试验共同表明,高速、高压重载冲击是破断硬质大块煤的有效方式,试验的成功为尾梁冲击破碎装置的井下应用打下了基础。
Large coal block was important factor that influenced coal flow transportation of the back working face and top coal recover of top coal caving, in order to improve large coal blockbroken ratio at back, system structures and block broken property of emulsion liquid impact broken hammer, two different designing schemes that built-in tail beam spile plate and lower surface attach type tail beam were compared, surface experiment of large block broken system by extrusion and impact under flexible jack movement, and total bro- ken of 0. 5m large block concrete was realized at one impact time. the results showed that high speed and high pressure large loading im- pact is an effectively method to harden large block broken, it references foundation for tail beam impact broken device apply in under- ground.
出处
《煤矿开采》
北大核心
2017年第2期106-109,共4页
Coal Mining Technology
基金
"十二五"863高技术研究发展计划资助项目(2012AA06A407)
关键词
放顶煤支架尾梁
冲击破碎装置
试验研究
硬质大块煤
support tail-beam of top coal caving
impact crushing device
experimental studying
harden and big block coal
