کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6782508 1432270 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigations into tilt angles and order of cutting sequences for cutting head design of roadheaders
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Investigations into tilt angles and order of cutting sequences for cutting head design of roadheaders
چکیده انگلیسی
This paper explains optimum arrangement of gauge tools and corner cutting picks for cutting head design of roadheaders. Full-scale simulation of roadheaders cutting heads of practical types with a wide range of tilt angles was carried out through laboratory linear cutting experiments. The trials showed that optimum tilt angle for corner cutting picks was approximately equal to the half breakout angle of the rock, and corner cutting picks acted as gauge tools after this value. Tilt angles greater than the optimum value were not recommended for both gauge and corner cutting picks, due to poor cutting efficiency and tool holder problems. Higher specific energy was found when the order of cutting sequences of unparalleled axis tools (the gauge tools) was arranged to start cutting from nose side of the cutting head than that of the opposite direction. The parallel axis tools on roadheaders cutting heads were, however, understood to be not affected by the order of cutting sequences. Furthermore, the effective area method which was previously suggested for tool force calculation of parallel axis tools was also verified for unparalleled axis tools investigated in this research study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tunnelling and Underground Space Technology - Volume 76, June 2018, Pages 160-171
نویسندگان
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