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        行程開關(guān)分類

        2013/12/30 8:17:39      點(diǎn)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(dòng)式、滾輪式、微動(dòng)式和組合式。直動(dòng)式行程開關(guān)動(dòng)作原理同按鈕類似,所不同的是:一個(gè)是手動(dòng),另一個(gè)則由運(yùn)動(dòng)部件的撞塊碰撞。當(dāng)外界運(yùn)動(dòng)部件上的撞塊碰壓按鈕使其觸頭動(dòng)作,當(dāng)運(yùn)動(dòng)部件離開后,在彈簧作用下,其觸頭自動(dòng)復(fù)位。
        其結(jié)構(gòu)原理如圖F1所示,其動(dòng)作原理與按鈕開關(guān)相同,但其觸點(diǎn)的分合速度取決于生產(chǎn)機(jī)械的運(yùn)行速度,不宜用于速度低于0.4m/min的場所。
        直動(dòng)式行程開關(guān)組成
        1:推桿 2&4:彈簧 3:動(dòng)斷觸點(diǎn) 5:動(dòng)合觸點(diǎn)
        滾輪式行程開關(guān)
        當(dāng)運(yùn)動(dòng)機(jī)械的擋鐵(撞塊)壓到行程開關(guān)的滾輪上時(shí),傳動(dòng)杠連同轉(zhuǎn)軸一同轉(zhuǎn)動(dòng),使凸輪推動(dòng)撞塊,當(dāng)撞塊碰壓到一定位置時(shí),推動(dòng)微動(dòng)開關(guān)快速動(dòng)作。當(dāng)滾輪上的擋鐵移開后,復(fù)位彈簧就使行程開關(guān)復(fù)位。這種是單輪自動(dòng)恢復(fù)式行程開關(guān)。而雙輪旋轉(zhuǎn)式行程開關(guān)不能自動(dòng)復(fù)原,它是依靠運(yùn)動(dòng)機(jī)械反向移動(dòng)時(shí),擋鐵碰撞另一滾輪將其復(fù)原。
        其結(jié)構(gòu)原理如圖F2所示,當(dāng)被控機(jī)械上的撞塊撞擊帶有滾輪的撞桿時(shí),撞桿轉(zhuǎn)向右邊,帶動(dòng)凸輪轉(zhuǎn)動(dòng),頂下推桿,使微動(dòng)開關(guān)中的觸點(diǎn)迅速動(dòng)作。當(dāng)運(yùn)動(dòng)機(jī)械返回時(shí),在復(fù)位彈簧的作用下,各部分動(dòng)作部件復(fù)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(diǎn) 10:橫板
        滾輪式行程開關(guān)又分為單滾輪自動(dòng)復(fù)位和雙滾輪(羊角式)非自動(dòng)復(fù)位式,雙滾輪行移開關(guān)具有兩個(gè)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(dòng)開關(guān)式行程開關(guān)
        微動(dòng)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(dòng)合觸點(diǎn) 4:動(dòng)斷觸點(diǎn) 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(jī)床及其他生產(chǎn)機(jī)械、自動(dòng)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(jī)械的行程。
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