8.2m超大采高综采成套装备研制及应用

Development and application of complete equipment for fully mechanized mining with 8.2m super-large mining height

针对6~8m厚煤层大采高一次采全厚综采技术与装备难题,以金鸡滩煤矿2-2上煤层赋存条件为基础,通过建立超大采高工作面顶板岩层断裂的"悬臂梁+砌体梁"力学模型及煤壁片帮的"拉裂-滑移"力学模型,研究了超大采高工作面顶板岩层断裂结构及煤壁片帮力学机理,研制了8.2m超大采高综采成套装备,实现了金鸡滩煤矿8.2m超大采高工作面安全、高效、高回采率开采。研究结果表明,通过液压支架与围岩的耦合动力学模型可以确定顶板岩层对液压支架的冲击动载荷,煤壁的破坏深度与开采高度、矿山压力呈正相关性,与煤体强度呈负相关性。通过设计研发大缸径抗冲击双伸缩立柱、三级协动护帮装置等新结构,提高了超大采高液压支架对围岩的适应性。通过研制大运量变频控制刮板输送机及新结构,解决了超大采高工作面瞬间煤量大、煤量变化大、片帮煤易压死刮板输送机等问题。研制了8.2m超大采高综采成套装备,设计采用"大梯度+小台阶"过渡配套方式,解决了端头煤损失问题。金鸡滩煤矿8.2m超大采高工作面日产5.7万t,月产达到150万t以上,实现了安全、高效、高回采率开采。

Aiming at the problems of fully - mechanized mining technology and equipment for 6 ~ 8m coal seam, the ＂cantilever- voussoir beam＂ and ＂tension fracture -slippage＂ mechanical model were established to study the roof strata fracture structure and rib spalling mechanism based on the coal seam condition in Jinjitan Coal Mine. The fully - mechanized mining equipment with 8.2m mining height were developed, which achieved safe, efficient and high - recovery mining with for working face with 8.2m mining height in Jinjintan Coal Mine. The result showed that, the dynamic load from roof stratum to hydraulic support was obtained through the coupling dynamics model of hydraulic support and surrounding rock. The damage depth of rib was positively correlated with mining height and mining pressure, while negatively correlated with coal strength. The adaptability of hydraulic support to surrounding rock was improved through developing the impact resistant double telescopic upright post, three - level entrainment support device and so on. The problem of instant volume coal, coal quantity change and rib spalling coal were solved by developing the scraper conveyer with frequency control and large capacity. The complete set of fully - mechanized mining equipment was developed. The end coal loss problem was solved by adopting the ＂large gradient ＋ small steps＂ mating pattern. The production capacity was 0. 57 million tons per day and 1.5 million tons per month in Jinjitan Coal Mine, which achieved safe, efficient and high - recover mining,