Mineable coal reserves in thick and extra-thick seams account for 44% of the total deposit in China. Fullymechanized top-coal caving technology is a new mining method of safe and efficient underground operations in ex...Mineable coal reserves in thick and extra-thick seams account for 44% of the total deposit in China. Fullymechanized top-coal caving technology is a new mining method of safe and efficient underground operations in extra-thick seams in China. The development of fullymechanized top-coal caving technology in China, which was successfully applied in Face 8105 in Tashan Coal Mine, Datong, Shanxi, China, is analyzed in this paper.Studies on movement pattern of top-coal and roof from fully-mechanized top caving face in 14–20 m extra-thick seams have been carried out. A series of key technologies were successfully developed, including strata control technology, equipment for high-efficient and high-recovery top caving operations, and safety guarantee technology for low gas occurrence and high gas emission. As a result, the fully-mechanized top-coal caving Face 8105, with large mining height in Tashan Coal Mine, has achieved a recovery rate of 88.9% and an average equipment operation rate of 92.1%. With coal production of 10.84 Mt in 2011,the demonstration project is a technology and equipment breakthrough for fully-mechanized top-coal caving face in extra-thick coal seams with large mining height.展开更多
针对大学生在机械类毕业设计课题方案选择环节呈现工程意识薄弱、没有科学的论证方法与模式等问题,开发了机械产品设计方案评价系统。该系统基于AHP法,建立了方案设计评价模型,该模型以机械产品的工作性能、经济性能、可靠性能为评价的...针对大学生在机械类毕业设计课题方案选择环节呈现工程意识薄弱、没有科学的论证方法与模式等问题,开发了机械产品设计方案评价系统。该系统基于AHP法,建立了方案设计评价模型,该模型以机械产品的工作性能、经济性能、可靠性能为评价的3个准则层,每个准则层下设计3个子准则层,科学、全面评价机械产品设计方案。为了增强系统的实际应用性,利用Visual Studio 2012 MFC编程,基于对话框、流文件读写技术,实现简易数据库及功能模块设计,完成了系统开发。展开更多
文摘Mineable coal reserves in thick and extra-thick seams account for 44% of the total deposit in China. Fullymechanized top-coal caving technology is a new mining method of safe and efficient underground operations in extra-thick seams in China. The development of fullymechanized top-coal caving technology in China, which was successfully applied in Face 8105 in Tashan Coal Mine, Datong, Shanxi, China, is analyzed in this paper.Studies on movement pattern of top-coal and roof from fully-mechanized top caving face in 14–20 m extra-thick seams have been carried out. A series of key technologies were successfully developed, including strata control technology, equipment for high-efficient and high-recovery top caving operations, and safety guarantee technology for low gas occurrence and high gas emission. As a result, the fully-mechanized top-coal caving Face 8105, with large mining height in Tashan Coal Mine, has achieved a recovery rate of 88.9% and an average equipment operation rate of 92.1%. With coal production of 10.84 Mt in 2011,the demonstration project is a technology and equipment breakthrough for fully-mechanized top-coal caving face in extra-thick coal seams with large mining height.
文摘针对大学生在机械类毕业设计课题方案选择环节呈现工程意识薄弱、没有科学的论证方法与模式等问题,开发了机械产品设计方案评价系统。该系统基于AHP法,建立了方案设计评价模型,该模型以机械产品的工作性能、经济性能、可靠性能为评价的3个准则层,每个准则层下设计3个子准则层,科学、全面评价机械产品设计方案。为了增强系统的实际应用性,利用Visual Studio 2012 MFC编程,基于对话框、流文件读写技术,实现简易数据库及功能模块设计,完成了系统开发。
