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索氏抽提儀機構與原曲柄搖桿機構的運動特性

發布時間:2016-12-13 08:45:00 點擊:

該機構與原曲柄搖桿機構的運動特性相同,索氏抽提儀其機構運動簡圖也完全一樣。在設 計機構時,當曲柄長度很短、曲柄銷需承受較大沖擊載荷而工作行程較小時,常 采用這種偏心盤結構型式,在沖床、剪床、壓印機床、柱塞油泵等設備中,均可見 到這種結構。 圖 !"#$ 偏心盤結構型式 !" 具有移動副的四桿機構 曲柄滑塊機構是具有一個移動副的四桿機構,在圖 !"#%& 所示的曲柄滑塊 機構中,若改選構件 !" 為機架(圖 !"#%’),此時構件 ! 繞軸 ! 轉動,而構件 ( 則 以構件 ! 為導軌沿其相對移動,構件 ! 稱為導桿,機構稱為導桿機構。 在導桿機構中,如果導桿能作整周轉動,則稱為轉動導桿機構。圖 !"#) 所 !"# 平面四桿機構的基本類型和演化 *# 圖 !"#$ 曲柄滑塊機構的演化 示的小型刨床中的 !"# 部分即為轉動導桿機構。如果導桿僅能在某一角度范 圍內擺動,則稱為擺動導桿機構。圖 !"#% 所示牛頭刨床的導桿機構 !"# 即為 一例。 圖 !"#& 小型刨床 圖 !"#% 牛頭刨床 如果在圖 !"#$’ 所示的曲柄滑塊機構中,改選構件 "# 為機架(圖 !"#$(),則 演化成為曲柄搖塊機構。其中構件 ) 僅能繞點 # 搖擺。圖 !"#* 所示的自卸卡 


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