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索氏萃取器再假設螺母與螺旋間的作用力系集中

發布時間:2016-12-13 08:44:00 點擊:

示方向相反。說明在這種情況下,!&’也是驅動力,索氏萃取器其作用是促使滑塊 # 沿斜面 等速下滑。 當正行程時,如果!!!+ 2",則#"-,斜面機構將發生自鎖。因正行程不應 自鎖,故應使!5!+ 2"。當反行程時,如果!"",則#’"-,斜面機構將自鎖。 #!"# 螺旋傳動的效率和自鎖 $6 !!"# 螺旋傳動的效率和自鎖 !"#"$ 矩形螺紋 圖 !"#$% 所示為一矩形螺紋螺旋副,其中 # 為螺旋,& 為螺母。通常在研究 螺旋副的摩擦時,都假定螺母與螺旋間的作用力集中在其中徑為 !& 的圓柱面 內;再假設螺母與螺旋間的作用力系集中在一小段螺紋上,把對螺旋副中摩擦的 研究簡化為對斜面的研究。因此,如將該螺旋沿中徑 !& 的圓柱面展開,該斜面 的升角即為螺旋在其中徑 !& 上的螺紋升角!,則有 圖 !"#$ 矩形螺紋的受力分析 ’%(!) " !!& ) #$ !!& (!"&*) 式中," 為螺紋的導程,# 為螺紋的頭數,$ 為螺距。 如圖 !"#$% 所示,螺母 & 上受到的軸向載荷為 %+ ,如果在螺母上加上一力 矩,使螺母逆向力 %+ 等速向上運動(對螺紋連接而言,相當于擰緊螺母),則如 圖 !"#$, 所示,相當于在滑塊 & 上加一水平力 %- ,使滑塊 & 沿著斜面 # 等速向上 滑動。這樣就可/


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