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      1. 行程開關(guān)分類

        2013/12/30 8:17:39      點擊:
        行程開關(guān) 按結(jié)構(gòu)分
         概述行程開關(guān)符號行程開關(guān)按其結(jié)構(gòu)可分為直動式、滾輪式、微動式和組合式。直動式行程開關(guān)動作原理同按鈕類似,所不同的是:一個是手動,另一個則由運動部件的撞塊碰撞。當外界運動部件上的撞塊碰壓按鈕使其觸頭動作,當運動部件離開后,在彈簧作用下,其觸頭自動復位。
        其結(jié)構(gòu)原理如圖F1所示,其動作原理與按鈕開關(guān)相同,但其觸點的分合速度取決于生產(chǎn)機械的運行速度,不宜用于速度低于0.4m/min的場所。
        直動式行程開關(guān)組成
        1:推桿 2&4:彈簧 3:動斷觸點 5:動合觸點
        滾輪式行程開關(guān)
        當運動機械的擋鐵(撞塊)壓到行程開關(guān)的滾輪上時,傳動杠連同轉(zhuǎn)軸一同轉(zhuǎn)動,使凸輪推動撞塊,當撞塊碰壓到一定位置時,推動微動開關(guān)快速動作。當滾輪上的擋鐵移開后,復位彈簧就使行程開關(guān)復位。這種是單輪自動恢復式行程開關(guān)。而雙輪旋轉(zhuǎn)式行程開關(guān)不能自動復原,它是依靠運動機械反向移動時,擋鐵碰撞另一滾輪將其復原。
        其結(jié)構(gòu)原理如圖F2所示,當被控機械上的撞塊撞擊帶有滾輪的撞桿時,撞桿轉(zhuǎn)向右邊,帶動凸輪轉(zhuǎn)動,頂下推桿,使微動開關(guān)中的觸點迅速動作。當運動機械返回時,在復位彈簧的作用下,各部分動作部件復位。
        滾輪式行程開關(guān)組成
        1:滾輪 2:上轉(zhuǎn)臂 3&5&11:彈簧 4:套架
        6:滑輪 7:壓板 8&9:觸點 10:橫板
        滾輪式行程開關(guān)又分為單滾輪自動復位和雙滾輪(羊角式)非自動復位式,雙滾輪行移開關(guān)具有兩個穩(wěn)態(tài)位置,有“記憶”作用,在某些情況下可以簡化線路。
        微動開關(guān)式行程開關(guān)
        微動開關(guān)式行程開關(guān)的組成,以常用的有LXW-11系列產(chǎn)品為例,其結(jié)構(gòu)原理如圖F3所示:
        1:推桿 2:彈簧 3:動合觸點 4:動斷觸點 5:壓縮彈簧

        按用途分

        一般用途行程開關(guān):如JW2、JW2A、LX19、LX31、LXW5、3SE3等系列。主要用于機床及其他生產(chǎn)機械、自動生產(chǎn)線的限位和程序控制。
        起重設(shè)備用行程開關(guān),如LX22、LX33系列。主要用于限制起重設(shè)備及各種冶金輔助機械的行程。
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