硬汉视频app

加(jia)重錘片金具之原(yuan)因：

有(you)級（同(tong)音(yin)）繼(ji)電(dian)(dian)器即(ji)(ji)是(shi)四(si)線(xian)(xian)制道岔啟動電(dian)(dian)路中(zhong)2道岔啟動繼(ji)電(dian)(dian)器，其具有(you)定(ding)(ding)位(wei)和反(fan)位(wei)兩個(ge)穩定(ding)(ding)狀(zhuang)態(tai)(tai)(tai)（±級），在(zai)通(tong)以正(zheng)向或反(fan)向電(dian)(dian)流時(shi)，使繼(ji)電(dian)(dian)器接(jie)點(dian)系(xi)統(tong)分別處于兩個(ge)狀(zhuang)態(tai)(tai)(tai)中(zhong)的(de)一個(ge)狀(zhuang)態(tai)(tai)(tai)，正(zheng)向吸起(qi)接(jie)點(dian)閉合或反(fan)向打落(luo)接(jie)點(dian)閉合，使用長條型磁(ci)(ci)鐵(tie)代替了(le)部(bu)分軛鐵(tie)，由于磁(ci)(ci)鐵(tie)的(de)磁(ci)(ci)力，線(xian)(xian)圈斷電(dian)(dian)，接(jie)點(dian)系(xi)統(tong)仍保持在(zai)斷電(dian)(dian)前的(de)狀(zhuang)態(tai)(tai)(tai)，即(ji)(ji)定(ding)(ding)位(wei)吸起(qi)狀(zhuang)態(tai)(tai)(tai)勵磁(ci)(ci)電(dian)(dian)路，反(fan)位(wei)打落(luo)狀(zhuang)態(tai)(tai)(tai)勵磁(ci)(ci)電(dian)(dian)路.

偏級(ji)繼(ji)電(dian)(dian)器是(shi)四(si)線(xian)制道岔啟動電(dian)(dian)路中定位(wei)表示(shi)繼(ji)電(dian)(dian)器和反位(wei)表示(shi)繼(ji)電(dian)(dian)器，其可鑒(jian)別電(dian)(dian)流(liu)的級(ji)性，在(zai)電(dian)(dian)路通以(yi)正向電(dian)(dian)流(liu)時(shi)前接(jie)點閉合(he)，無電(dian)(dian)或通以(yi)反向電(dian)(dian)流(liu)時(shi)，繼(ji)電(dian)(dian)器均不動作(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。