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索氏萃取器根據行程速比系數設計四桿機構時

發布時間:2016-12-22 10:34:00 點擊:

這樣求得的圖形 $!! "! # 就是要設計的鉸鏈 四桿機構,索氏萃取器其中 "! %! # 為一個構件,即為一個連架桿。這樣,可以保證當 "# 桿 到達 "! # 位置時,與其相固接成一體的 #% 到達題中要求的位置 #%! 。 ")由圖上量出尺寸乘以比例尺!& ,即得連桿 !" 和連架桿 "# 的長度 ’ #!& $ !! "! ( #!& $ "! # 由于 ’!% 和 ’%& 的交點只有一個,故該機構只有一個解。 !" 按給定行程速比系數設計平面四桿機構 根據行程速比系數設計四桿機構時,可利用機構在極限位置時的幾何關系, 再結合其他輔助條件進行設計。現將幾種常見機構的作圖設計方法介紹如下。 圖 "’&( 給定行程速比系數 設計平面四桿機構 (!)曲柄搖桿機構 設已知搖桿的長度 "#,擺角" 及行程 速比系數 ),試設計此曲柄搖桿機構。 設計時先根據## !)*+) , ! ) - ! 算出極位夾 角#。然后根據搖桿長度 "# 及擺角" 作出 搖桿的兩極位 "! # 及 "% #(圖 "’&(),再作 "% *!"! "% ,作""% "! + # .*+ ,#,"% * 與 "! + 交于 ,;作#,"! "% 的外接圓;則圓弧 "! ,"% 上任一點 $ 至 "! 和 "% 的連線之夾 角""! $"% 都等于極位夾角#,所以曲柄軸 心 $ 應選在此圓弧上。 設曲柄長度為 -,連桿長度為 ’,則 $"! # ’ - -,而 $"% # ’ , -,故 - # $"! , $"% % ,’ # $"! - $"% % 。 設計時應注意,曲柄的軸心 $ 不能選在 ./ 劣弧段上,否則機構將不滿足運 動連續性要求。因這時機構的兩極位 #"! 、#"% 


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