電力液壓管道通風啟閉器電力液壓管道通風啟閉器

要進行更換(huan)。檢(jian)(jian)修制動(dong)輪時必須(xu)用煤(mei)油(you)清(qing)洗，以保證其(qi)摩擦面(mian)光滑，無油(you)膩。檢(jian)(jian)修調(diao)整后。

制(zhi)動(dong)帶應正(zheng)確地(di)靠在制(zhi)動(dong)輪上，要求其間隙為0．8～1mm。n按所需的制動(dong)力矩選(xuan)擇(ze)標(biao)準制動(dong)器，對于起重機(ji)的工作(zuo)級別為幾個機(ji)構，若每(mei)小時(shi)制動(dong)不大于150次，則不(bu)需(xu)進行發(fa)(fa)熱驗(yan)算；但對于工作級別為較(jiao)強機(ji)構，必須進行發(fa)(fa)熱驗(yan)算。制(zhi)動(dong)(dong)器發(fa)(fa)熱溫(wen)升的情況見(jian)溫(wen)度(du)在第一次制(zhi)動(dong)(dong)的制(zhi)動(dong)(dong)輪發(fa)(fa)熱同時向空(kong)氣中(zhong)散熱，制(zhi)動(dong)(dong)輪溫(wen)度(du)由一較(jiao)低(di)溫(wen)度(du)升到另(ling)一較(jiao)高(gao)溫(wen)度(du)。

在第一次制(zhi)(zhi)動終了到第二(er)次制(zhi)(zhi)動開始的(de)時(shi)，制(zhi)(zhi)動輪不產生(sheng)熱(re)(re)(re)量(liang)，而是向周圍散(san)熱(re)(re)(re)。但(dan)由于制(zhi)(zhi)動停歇短，即(ji)在制(zhi)(zhi)動輪冷卻(que)溫度(du)(du)(du)尚未降到相(xiang)應溫度(du)(du)(du)前(qian)，又(you)進(jin)行(xing)第二(er)次制(zhi)(zhi)動，此時(shi)制(zhi)(zhi)動輪溫升再度(du)(du)(du)增加。當制(zhi)(zhi)動器經過若干次制(zhi)(zhi)動以后，其(qi)制(zhi)(zhi)動的(de)發(fa)熱(re)(re)(re)量(liang)與散(san)熱(re)(re)(re)量(liang)相(xiang)等時(shi)，即(ji)進(jin)入熱(re)(re)(re)平衡(heng)狀(zhuang)態。若熱(re)(re)(re)平衡(heng)時(shi)的(de)高溫度(du)(du)(du)不大(da)于摩擦襯墊的(de)允許溫度(du)(du)(du)，則制(zhi)(zhi)動器的(de)發(fa)熱(re)(re)(re)驗算通過。

制動過(guo)程中若不能(neng)滿足條件，則(ze)應(ying)采取相應(ying)措施。常用增加制動輪直徑，加散熱筋及(ji)改善通風等方(fang)法(fa)，來滿足上(shang)述(shu)熱平(ping)衡條件。n目前(qian)各類汽(qi)車所用的(de)車輪制動(dong)器(qi)，基本上可分為兩(liang)大(da)類，即(ji)鼓式和盤式兩(liang)類。它們的(de)區(qu)別是：前(qian)者(zhe)(zhe)的(de)摩擦(ca)副(fu)中(zhong)，旋轉(zhuan)元件(jian)為制動(dong)鼓，工作表(biao)面(mian)(mian)為圓(yuan)柱(zhu)面(mian)(mian)；后者(zhe)(zhe)的(de)摩擦(ca)副(fu)中(zhong)，旋轉(zhuan)元件(jian)為圓(yuan)盤狀的(de)制動(dong)盤，工作表(biao)面(mian)(mian)為兩(liang)端面(mian)(mian)。

鼓式制(zhi)動(dong)(dong)器(qi)(qi)摩擦(ca)副中的(de)固定(ding)(ding)元(yuan)件，多用(yong)(yong)帶摩擦(ca)片的(de)制(zhi)動(dong)(dong)蹄(ti)。按制(zhi)動(dong)(dong)蹄(ti)張開裝置的(de)形式不同(tong)(tong)，鼓式制(zhi)動(dong)(dong)器(qi)(qi)又可分為(wei)液壓驅動(dong)(dong)輪(lun)缸張開式和氣(qi)壓驅動(dong)(dong)凸輪(lun)張開式兩類。盤(pan)(pan)(pan)式制(zhi)動(dong)(dong)器(qi)(qi)，其傳(chuan)動(dong)(dong)機構多為(wei)液力式。按其固定(ding)(ding)摩擦(ca)元(yuan)件結構的(de)不同(tong)(tong)，可分為(wei)鉗(qian)盤(pan)(pan)(pan)式，適用(yong)(yong)于前輪(lun)制(zhi)動(dong)(dong)器(qi)(qi)，也有的(de)汽車(che)前、后(hou)輪(lun)制(zhi)動(dong)(dong)器(qi)(qi)均采用(yong)(yong)盤(pan)(pan)(pan)式制(zhi)動(dong)(dong)器(qi)(qi)。轎車(che)一般是前輪(lun)為(wei)盤(pan)(pan)(pan)式，后(hou)輪(lun)采用(yong)(yong)鼓式。