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[主观题]
斜井箕⽃缠绕式提升机,箕⽃⼀次载煤质量Q=45000kg,⾃⾝质量Q0=3500kg。提升钢丝绳标号为6×7—32—1550—1—光—右同,全部钢丝拉断⼒总和为626000N,⾃⾝质量为Wp=3.5kg/m。箕⽃运⾏阻⼒系数u1=0.01,钢丝绳与道滚、钢轨摩擦系数u2=0.15。提升钢丝绳由天轮到井下装载处提升容器的长度L=800m,井筒坡度а=35°。试核算提升钢丝绳的安全系数。
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A.5%;45.5%
B.2.5%;47.5%
C.5.5%;44.5%
D.90%;10%