簡介:"
"
1,限位開關就是用以限定機械設備的運動極限位置的電氣開關。"
"
2,限位開關有接觸式的和非接觸式的,"
"
3,在電氣控制系統中,限位開關的作用是實現順序控制、定位控制和位置狀態的檢測"
"
4,限位開關廣泛用于各類機床和起重機械,用以控制其行程、進行終端限位保護"
"
簡介
限(xian)位(wei)(wei)開(kai)(kai)關(guan)(guan)就是(shi)用以(yi)(yi)限(xian)定(ding)(ding)機械設(she)備的(de)(de)(de)運動極(ji)限(xian)位(wei)(wei)置的(de)(de)(de)電(dian)氣開(kai)(kai)關(guan)(guan)。限(xian)位(wei)(wei)開(kai)(kai)關(guan)(guan)有接(jie)觸式(shi)(shi)(shi)的(de)(de)(de)和非接(jie)觸式(shi)(shi)(shi)的(de)(de)(de)。接(jie)觸式(shi)(shi)(shi)的(de)(de)(de)比較直觀,機械設(she)備的(de)(de)(de)運動部(bu)件上,安(an)裝(zhuang)(zhuang)上行(xing)(xing)程(cheng)開(kai)(kai)關(guan)(guan),與其相(xiang)對運動的(de)(de)(de)固定(ding)(ding)點上安(an)裝(zhuang)(zhuang)極(ji)限(xian)位(wei)(wei)置的(de)(de)(de)擋塊,或者是(shi)相(xiang)反安(an)裝(zhuang)(zhuang)位(wei)(wei)置。當行(xing)(xing)程(cheng)開(kai)(kai)關(guan)(guan)的(de)(de)(de)機械觸頭碰上擋塊時,切斷(duan)了(或改變了)控制電(dian)路,機械就停止運行(xing)(xing)或改變運行(xing)(xing)。由于(yu)機械的(de)(de)(de)慣(guan)性運動,這種(zhong)行(xing)(xing)程(cheng)開(kai)(kai)關(guan)(guan)有一定(ding)(ding)的(de)(de)(de)“超行(xing)(xing)程(cheng)”以(yi)(yi)保護開(kai)(kai)關(guan)(guan)不受損壞。非接(jie)觸式(shi)(shi)(shi)的(de)(de)(de)形(xing)式(shi)(shi)(shi)很(hen)多(duo),常(chang)見(jian)(jian)的(de)(de)(de)有干簧管、光電(dian)式(shi)(shi)(shi)、感(gan)應式(shi)(shi)(shi)等(deng),這幾(ji)種(zhong)形(xing)式(shi)(shi)(shi)在(zai)電(dian)梯(ti)中都能(neng)夠見(jian)(jian)到。當然還有更多(duo)的(de)(de)(de)先(xian)進形(xing)式(shi)(shi)(shi)。
限位開關是一種常用(yong)(yong)的小電(dian)(dian)流主令電(dian)(dian)器。利用(yong)(yong)生產機(ji)(ji)械(xie)(xie)(xie)運(yun)(yun)(yun)動(dong)(dong)(dong)部件(jian)的碰撞使其觸頭動(dong)(dong)(dong)作來實現接通(tong)或(huo)分斷(duan)控制(zhi)電(dian)(dian)路,達(da)到一定(ding)的控制(zhi)目(mu)的。通(tong)常,這(zhe)類(lei)開關被用(yong)(yong)來限制(zhi)機(ji)(ji)械(xie)(xie)(xie)運(yun)(yun)(yun)動(dong)(dong)(dong)的位置或(huo)行程,使運(yun)(yun)(yun)動(dong)(dong)(dong)機(ji)(ji)械(xie)(xie)(xie)按一定(ding)位置或(huo)行程自動(dong)(dong)(dong)停止(zhi)、反向運(yun)(yun)(yun)動(dong)(dong)(dong)、變速運(yun)(yun)(yun)動(dong)(dong)(dong)或(huo)自動(dong)(dong)(dong)往返(fan)運(yun)(yun)(yun)動(dong)(dong)(dong)等。
在(zai)電氣控(kong)制系(xi)統(tong)中,限(xian)位(wei)開關的作用是實現順序控(kong)制、定位(wei)控(kong)制和(he)位(wei)置(zhi)狀態的檢測。用于控(kong)制機械設備(bei)的行程(cheng)及限(xian)位(wei)保護(hu)。構(gou)造:由操作頭、觸點系(xi)統(tong)和(he)外殼(ke)組(zu)成。
在實(shi)際生產(chan)中(zhong),將限位(wei)開關(guan)安(an)裝在預先安(an)排(pai)的(de)位(wei)置,當裝于生產(chan)機械運動部件上(shang)的(de)模塊撞擊行程開關(guan)時(shi),限位(wei)開關(guan)的(de)觸點(dian)動作,實(shi)現電路的(de)切(qie)(qie)換。因此,行程開關(guan)是一種根據運動部件的(de)行程位(wei)置而切(qie)(qie)換電路的(de)電器(qi),它(ta)的(de)作用(yong)原理與按鈕(niu)類似。
限位(wei)開關(guan)廣泛用于各類機床和起重機械,用以控(kong)制其行程(cheng)、進行終端限位(wei)保護。在電(dian)梯的(de)控(kong)制電(dian)路中,還利用行程(cheng)開關(guan)來控(kong)制開關(guan)轎門的(de)速度、自動開關(guan)門的(de)限位(wei),轎廂(xiang)的(de)上、下限位(wei)保護。