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閥門普通開關防爆型電動執行機構結構說(shuo)明

1、電動機(ji)：戶外型(xing)(xing)采用YDF型(xing)(xing)，隔爆型(xing)(xing)采用YBDF型(xing)(xing)閥(fa)門(men)三相異步電動機(ji)。

2、減速(su)機構(gou)：由一對直齒輪和蝸輪副兩級傳動組成(cheng)。電動機的動力經減速(su)機構(gou)傳遞給輸出(chu)軸。

3、力矩控制機構：當(dang)輸出軸上受到一(yi)定(ding)(ding)轉(zhuan)(zhuan)矩后，蝸(gua)桿(gan)除旋轉(zhuan)(zhuan)外還(huan)產生軸向位(wei)移(yi)，帶動曲(qu)拐，曲(qu)拐直接（或通過撞(zhuang)塊）帶動支架產生角位(wei)移(yi)。當(dang)輸出軸上的(de)轉(zhuan)(zhuan)矩增大到整定(ding)(ding)轉(zhuan)(zhuan)矩時，則支架產生的(de)位(wei)移(yi)量(liang)使(shi)微動開關動作，從而切斷(duan)電(dian)(dian)機電(dian)(dian)源(yuan)，電(dian)(dian)動機停轉(zhuan)(zhuan)。以此實現(xian)對電(dian)(dian)動裝置輸出轉(zhuan)(zhuan)矩的(de)控制，達到保護電(dian)(dian)動閥門的(de)目的(de)。

4、行程控制機構：閥門普通開關防爆型電動執行機構

采用十(shi)進(jin)制(zhi)(zhi)(zhi)計數(shu)器(qi)原(yuan)(yuan)理，又稱(cheng)為計數(shu)器(qi)，控制(zhi)(zhi)(zhi)精度高，結構見圖7。其工作(zuo)原(yuan)(yuan)理為：由減速(su)箱(xiang)內的一對(dui)大小(xiao)傘(san)齒(chi)輪(lun)帶動中傳小(xiao)齒(chi)輪(lun)，再帶動行(xing)程控制(zhi)(zhi)(zhi)機構工作(zuo)。如果(guo)行(xing)程控制(zhi)(zhi)(zhi)器(qi)按閥門開、關(guan)的位置(zhi)已(yi)調整好，當控制(zhi)(zhi)(zhi)器(qi)隨輸出軸轉動到預先(xian)調整好的位置(zhi)（圈(quan)數(shu)）時，則凸輪(lun)將轉動90°，迫(po)使微(wei)動開關(guan)動作(zuo)，切(qie)斷(duan)電(dian)(dian)動機電(dian)(dian)源(yuan)，電(dian)(dian)動機停轉，從而實現對(dui)電(dian)(dian)動裝置(zhi)行(xing)程（轉圈(quan)數(shu)）的控制(zhi)(zhi)(zhi)。

注1：為了控制較多(duo)轉圈(quan)數的(de)閥(fa)門(men)，可調整凸輪(lun)轉180°或(huo)270°再壓迫微動開關動作。

5、開度指(zhi)示(shi)(shi)機構(gou)(gou)：結(jie)構(gou)(gou)見(jian)圖8。輸(shu)(shu)入齒(chi)輪(lun)(lun)由(you)計數器(qi)個位齒(chi)輪(lun)(lun)帶(dai)動(dong)(dong)，經減(jian)速后，指(zhi)示(shi)(shi)盤(pan)隨閥門的開關(guan)過程同時轉(zhuan)(zhuan)(zhuan)動(dong)(dong)，以指(zhi)示(shi)(shi)閥門的開關(guan)量，電位器(qi)軸(zhou)和(he)指(zhi)示(shi)(shi)盤(pan)同步轉(zhuan)(zhuan)(zhuan)動(dong)(dong)，供(gong)遠(yuan)傳(chuan)開度指(zhi)示(shi)(shi)用(yong)。移動(dong)(dong)轉(zhuan)(zhuan)(zhuan)圈數調整齒(chi)輪(lun)(lun)可(ke)以改(gai)變轉(zhuan)(zhuan)(zhuan)圈數。開度指(zhi)示(shi)(shi)機構(gou)(gou)內(nei)設一微動(dong)(dong)開關(guan)和(he)凸(tu)輪(lun)(lun)，當電動(dong)(dong)裝置運(yun)轉(zhuan)(zhuan)(zhuan)時，旋轉(zhuan)(zhuan)(zhuan)凸(tu)輪(lun)(lun)周期性地使微動(dong)(dong)開關(guan)動(dong)(dong)作，其(qi)頻率為輸(shu)(shu)出軸(zhou)轉(zhuan)(zhuan)(zhuan)動(dong)(dong)一圈動(dong)(dong)作一次(ci)(ci)或二次(ci)(ci)，可(ke)供(gong)閃(shan)光信(xin)號等(deng)使用(yong)。

6、手(shou)(shou)(shou)(shou)(shou)—電動(dong)(dong)切換機(ji)(ji)構：為半自動(dong)(dong)切換，手(shou)(shou)(shou)(shou)(shou)動(dong)(dong)時(shi)需扳動(dong)(dong)手(shou)(shou)(shou)(shou)(shou)柄切換，手(shou)(shou)(shou)(shou)(shou)動(dong)(dong)狀(zhuang)(zhuang)態轉(zhuan)變(bian)為電動(dong)(dong)時(shi)則自動(dong)(dong)運行(xing)。其結構見圖9。它(ta)由(you)手(shou)(shou)(shou)(shou)(shou)柄、切換件、直立桿、離(li)(li)合(he)(he)器(qi)、壓(ya)簧等組成。需手(shou)(shou)(shou)(shou)(shou)**作(zuo)時(shi)，將手(shou)(shou)(shou)(shou)(shou)柄向(xiang)手(shou)(shou)(shou)(shou)(shou)動(dong)(dong)方向(xiang)推動(dong)(dong)，切換件使離(li)(li)合(he)(he)器(qi)抬高，并壓(ya)迫壓(ya)簧。當手(shou)(shou)(shou)(shou)(shou)柄推到一(yi)定位置時(shi)，離(li)(li)合(he)(he)器(qi)即(ji)脫(tuo)(tuo)離(li)(li)蝸輪(lun)(lun)而與(yu)手(shou)(shou)(shou)(shou)(shou)輪(lun)(lun)嚙(nie)合(he)(he)，同(tong)時(shi)直立桿在扭簧作(zuo)用(yong)下直立于蝸輪(lun)(lun)端(duan)面(mian)，支撐住離(li)(li)合(he)(he)器(qi)不致(zhi)下落，切換完成即(ji)可(ke)放開手(shou)(shou)(shou)(shou)(shou)柄，使用(yong)手(shou)(shou)(shou)(shou)(shou)輪(lun)(lun)進行(xing)操(cao)作(zuo)。而需電動(dong)(dong)操(cao)作(zuo)時(shi)，電動(dong)(dong)機(ji)(ji)將帶(dai)動(dong)(dong)蝸輪(lun)(lun)轉(zhuan)動(dong)(dong)，支承(cheng)于蝸輪(lun)(lun)端(duan)面(mian)的(de)直立桿即(ji)倒下，在壓(ya)簧作(zuo)用(yong)下離(li)(li)合(he)(he)器(qi)迅(xun)速向(xiang)蝸輪(lun)(lun)方向(xiang)移(yi)動(dong)(dong)，并與(yu)蝸輪(lun)(lun)嚙(nie)合(he)(he)，同(tong)時(shi)與(yu)手(shou)(shou)(shou)(shou)(shou)輪(lun)(lun)脫(tuo)(tuo)開，自動(dong)(dong)實現手(shou)(shou)(shou)(shou)(shou)動(dong)(dong)到電動(dong)(dong)狀(zhuang)(zhuang)態的(de)轉(zhuan)換。