1) roof fall at the end-face
端面冒落
1.
9602 coal face at Zhang Ji Colliery in Xu Zhou Area, reasons of roof fall at the end-face are analyzed, which exists at conventional machine mining face in large dip and mining height coal seam, controlling roof fall measures at the end-face are put forward.
根据徐州矿务局张集煤矿9602工作面发生的端面冒落事故和现场实测数据,分析了大倾角“大采高”煤层高档普采工作面端面冒落的原因,提出了控制端面冒落的措施。
2) roof falling in face area
端面冒顶
3) leakage risk of top coal
端面漏冒
1.
The law of fracture and instability and leakage risk of top coal in thick coal seam with a stratum of gangue in fully-mechanized mining with top coal caving is obtained aft
本文以涡北煤矿8102工作面的地质条件和生产技术条件为基础,综合运用理论分析、数值模拟和现场实测等方法,对软煤、厚硬顶板、含夹矸厚煤层综放开采围岩运移规律、夹矸层对顶煤冒放的影响及含夹矸层顶煤端面漏冒机理进行了系统研究。
4) weighting over great extent
大面积顶板冒落
1.
The prediction of the hazard caused by weighting over great extent of top layer in mine worked-out section area;
本文建立了采空区大面积顶板冒落造成的冲击气浪的最大速度预测模型。
5) roof fall over great extent
顶板大面积冒落
1.
Study on the rule caused by roof fall over great extent of worked-out area in mine;
采空区顶板大面积冒落规律研究
6) fall
[英][fɔ:l] [美][fɔl]
冒落
1.
The hing girder assorting with π type steel used in broken caving roof in Nanshan Coal Mine,Hegang Mining Bureau can not only solve the roof fall accident but also meet the needs of section mining support.
鹤岗矿务局南山煤矿在破碎易冒落顶板中 ,铰接顶梁与π型钢梁配套使用 ,不仅解决了顶板易发生的抽漏冒顶事故 ,而且满足了分层开采各分层顶板支护的要
2.
Through observing and analyzing to roof and wall of spot in 6114 workface,this paper sum up rules and features of rib spalling and roof fall under complicated geology condition in sub-level caving mining workface,it raises a series of roof control measures and gets good result.
通过对 6 114工作面顶板、煤壁现状的现场观测和理论分析 ,总结出了复杂地质条件下综放工作面煤壁片帮、端面顶板冒落的规律和特点 ,提出了一系列复杂地质条件下综放工作面顶板控制措施 ,现场应用后取得了较好的效
补充资料:车端面、切槽和切断
一、车端面
常用的端面车刀(弯头刀和偏刀)和车端面的方法,如金工实习教材第160页所示。
对于既车外圆又车端面的场合,常使用弯头车刀和偏刀来车削端面。弯头车刀是用主切削刃担任切削,适用于车削较大的端面。偏刀从外向里车削端面,是用车外圆时的副切削刃担任切削,副切削刃的前角较小,切削不够轻里向外车削端面,便没有这个缺点,不过工件必须有孔才行。
车端面操作注意点:
(1)安装工件时,要对其外圆及端面找正。
(2)安装车刀时,刀尖应严格对准工件中心,以免端面出现凸台,造成崩坏刀尖。
(3)端面质量要求较高时,最后一刀应由中心向外切削。
(4)车削大端面时,为使车刀准确地横向进给,应将大溜板紧固在床身上,用小刀架调整切削深度。
二、切槽
切槽时用切槽刀。切槽刀前为主切削刃,两测为副切削刃。安装切槽刀,其主切削刃应平行于工件轴线,主刀刃与工件轴线同一高度。
切窄槽,主切削刃宽度等于槽宽,横向走刀一次将槽切出。切宽槽,主切削刃宽度小于槽宽,分几次横向走刀,切出槽宽;切出槽宽后,纵向走刀精车槽底,切完宽槽。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条