硬汉视频app

加重錘片(pian)金具之原(yuan)因：

有級（同(tong)音）繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)即是四線(xian)(xian)制道岔(cha)啟動電(dian)(dian)(dian)(dian)(dian)路(lu)中(zhong)2道岔(cha)啟動繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)，其具有定(ding)(ding)位(wei)和反位(wei)兩(liang)(liang)個穩定(ding)(ding)狀態(tai)（±級），在(zai)(zai)通以正(zheng)向(xiang)或反向(xiang)電(dian)(dian)(dian)(dian)(dian)流時，使(shi)繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)接點系統分(fen)(fen)別處于兩(liang)(liang)個狀態(tai)中(zhong)的(de)(de)一(yi)個狀態(tai)，正(zheng)向(xiang)吸起接點閉合(he)或反向(xiang)打(da)落(luo)接點閉合(he)，使(shi)用長條(tiao)型磁(ci)(ci)(ci)鐵(tie)代替了部(bu)分(fen)(fen)軛鐵(tie)，由(you)于磁(ci)(ci)(ci)鐵(tie)的(de)(de)磁(ci)(ci)(ci)力，線(xian)(xian)圈斷(duan)電(dian)(dian)(dian)(dian)(dian)，接點系統仍保持在(zai)(zai)斷(duan)電(dian)(dian)(dian)(dian)(dian)前的(de)(de)狀態(tai)，即定(ding)(ding)位(wei)吸起狀態(tai)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)路(lu)，反位(wei)打(da)落(luo)狀態(tai)勵(li)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)路(lu).

偏級繼(ji)電(dian)器是四線制道岔啟動(dong)電(dian)路(lu)中定位表(biao)示繼(ji)電(dian)器和反位表(biao)示繼(ji)電(dian)器，其可鑒別電(dian)流(liu)的級性，在(zai)電(dian)路(lu)通(tong)以正向電(dian)流(liu)時前(qian)接點閉(bi)合(he)，無電(dian)或通(tong)以反向電(dian)流(liu)時，繼(ji)電(dian)器均不動(dong)作(zuo).

直流無級繼電器即是信號機點燈電路中的信號繼電器，當給線圈通以標定的工作電流，電磁鐵勵磁帶動接點系統，使前接點與中接點閉合，線圈斷電或電流下降達不到規定數值，靠接點簧 片彈力和重錘片重力使中接點與前接點斷開，與后接點閉合，使用或加重錘片是為了從結構上保證繼電器接點可靠閉合或斷開。