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撥(bo)叉式氣動執行(xing)器(qi),是一(yi)種程活塞(sai)式執行(xing)機構(gou),適用90°轉角(jiao)的(de)閥門(men)(如球閥、蝶閥、旋塞(sai)閥)的(de)開關切斷(duan)或(huo)計(ji)量控制。
撥叉(cha)(cha)式氣(qi)動執行(xing)器,通常(chang)指的是(shi)結(jie)構(gou)為”單氣(qi)缸雙活塞(sai)-變扭矩撥叉(cha)(cha)式“氣(qi)動執行(xing)器。
壓縮空(kong)氣(qi)(qi)進入氣(qi)(qi)缸,推動(dong)(dong)活(huo)塞作(zuo)直線(xian)運(yun)動(dong)(dong),活(huo)塞通利用(yong)活(huo)塞銷(xiao)與撥叉U型槽(cao)設計(ji)將活(huo)塞的直線(xian)運(yun)動(dong)(dong)轉(zhuan)(zhuan)為(wei)撥叉的旋(xuan)轉(zhuan)(zhuan)運(yun)動(dong)(dong),撥叉旋(xuan)轉(zhuan)(zhuan)帶動(dong)(dong)輸出(chu)軸轉(zhuan)(zhuan)動(dong)(dong),從而實現對閥門的控制(zhi)。
按照作(zuo)(zuo)用(yong)(yong)類型的(de)(de)不(bu)同,可(ke)分為單(dan)作(zuo)(zuo)用(yong)(yong)撥(bo)(bo)叉(cha)式氣(qi)(qi)(qi)(qi)動(dong)(dong)(dong)執(zhi)行器和雙作(zuo)(zuo)用(yong)(yong)撥(bo)(bo)叉(cha)式氣(qi)(qi)(qi)(qi)動(dong)(dong)(dong)執(zhi)行器。執(zhi)行器的(de)(de)開關(guan)動(dong)(dong)(dong)作(zuo)(zuo)都是通過氣(qi)(qi)(qi)(qi)源(yuan)驅動(dong)(dong)(dong)完成的(de)(de),就是雙作(zuo)(zuo)用(yong)(yong)撥(bo)(bo)叉(cha)式氣(qi)(qi)(qi)(qi)動(dong)(dong)(dong)執(zhi)行器;而只(zhi)有開動(dong)(dong)(dong)作(zuo)(zuo)是由氣(qi)(qi)(qi)(qi)源(yuan)驅動(dong)(dong)(dong)完成,關(guan)動(dong)(dong)(dong)作(zuo)(zuo)為彈簧復位(wei)的(de)(de)就是單(dan)作(zuo)(zuo)用(yong)(yong)撥(bo)(bo)叉(cha)式氣(qi)(qi)(qi)(qi)動(dong)(dong)(dong)執(zhi)行器。
按照結構的不同,可(ke)分(fen)為單(dan)氣缸活(huo)塞式(shi)和雙(shuang)氣缸活(huo)塞式(shi)。
按主(zhu)要材(cai)質的不同(tong),可分為鋁(lv)合(he)金型(xing)(xing)、不銹鋼(gang)(gang)型(xing)(xing)、碳(tan)鋼(gang)(gang)型(xing)(xing)等。