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擺動式液壓缸

擺(bai)動(dong)(dong)(dong)(dong)(dong)式(shi)(shi)(shi)液(ye)壓(ya)缸(gang)是輸出扭矩(ju)并實(shi)現往復(fu)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)的(de)(de)執行元件，有單(dan)葉片(pian)、雙(shuang)(shuang)葉片(pian)、螺旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)(dong)(dong)等幾種(zhong)形式(shi)(shi)(shi)。葉片(pian)式(shi)(shi)(shi)式(shi)(shi)(shi)：定(ding)子塊(kuai)固定(ding)在缸(gang)體上，而葉片(pian)和轉(zhuan)(zhuan)子連接在一起。根據進油方向，葉片(pian)將帶動(dong)(dong)(dong)(dong)(dong)轉(zhuan)(zhuan)子作往復(fu)擺(bai)動(dong)(dong)(dong)(dong)(dong)。螺旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)(dong)(dong)式(shi)(shi)(shi)又分(fen)單(dan)螺旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)(dong)(dong)和雙(shuang)(shuang)螺旋(xuan)(xuan)兩種(zhong)，現在雙(shuang)(shuang)螺旋(xuan)(xuan)比較常用(yong)，靠兩個螺旋(xuan)(xuan)副(fu)降液(ye)壓(ya)缸(gang)內活塞(sai)的(de)(de)直線(xian)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)轉(zhuan)(zhuan)變為直線(xian)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)與自轉(zhuan)(zhuan)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)的(de)(de)復(fu)he運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)，從(cong)而實(shi)現擺(bai)動(dong)(dong)(dong)(dong)(dong)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)。

(5)液(ye)壓(ya)缸(gang)初始(shi)動作緩(huan)慢(man)。在溫(wen)(wen)度(du)(du)較低的情況下(xia)，液(ye)壓(ya)油(you)黏(nian)(nian)度(du)(du)大，流動性差(cha)，導(dao)致液(ye)壓(ya)缸(gang)動作緩(huan)慢(man)。改善方(fang)法是，更換(huan)黏(nian)(nian)溫(wen)(wen)性能較好的液(ye)壓(ya)油(you)，在低溫(wen)(wen)下(xia)可借助加熱(re)器(qi)或用機器(qi)自身加熱(re)以提升啟動時(shi)的油(you)溫(wen)(wen)，系統正常工作油(you)溫(wen)(wen)應保(bao)持在40℃左右。

2、工(gong)作時(shi)不能驅動(dong)負載

主要表(biao)現為活塞桿停(ting)位不準、推力不足、速度(du)下降、工作不穩定等,其(qi)原因是：

密封件(jian)在液壓缸失(shi)效分析

密封(feng)(feng)是(shi)保(bao)證液壓(ya)(ya)系(xi)統(tong)(tong)正(zheng)常工作基本也是(shi)重要的(de)(de)裝置(zhi)。在液壓(ya)(ya)、氣(qi)動系(xi)統(tong)(tong)中(zhong)大(da)部分泄(xie)漏是(shi)由于密封(feng)(feng)失(shi)效造成的(de)(de)。前幾(ji)期(qi)介紹了(le)密封(feng)(feng)產品(pin)及(ji)密封(feng)(feng)系(xi)統(tong)(tong)，本期(qi)小(xiao)編給(gei)你帶來液壓(ya)(ya)缸中(zhong)密封(feng)(feng)圈失(shi)效的(de)(de)主(zhu)要原(yuan)因及(ji)失(shi)效形(xing)式,并提出了(le)具體解決(jue)的(de)(de)辦法，只有在工作中(zhong)積累經驗，不(bu)斷總(zong)結分析使用(yong)中(zhong)出現的(de)(de)問題，才(cai)能使密封(feng)(feng)件(jian)得到更好(hao)的(de)(de)應用(yong)。

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密封失效原因

1.密封(feng)設計導(dao)致失效

◆不適(shi)用(yong)的材料選擇（水解、耐(nai)(nai)化學性、耐(nai)(nai)溫性、表面速(su)度等(deng)）

◆不合(he)理的結構(gou)設計(ji)（壓力(li)、低溫、過載(zai)等，例(li)如：串(chuan)漏）

◆不適用的間隙推薦和公差等級

◆不合理的產品選型（單作用、雙作用、保(bao)壓要求(qiu)等(deng)）

2..密封(feng)應用導致失效

◆過高的系統(tong)壓力

◆應用溫度太高(gao)或太低(di)（耐溫失效、老化）

◆表面粗(cu)糙度(du)、油(you)液污染物

◆瞬時過載

◆安裝(zhuang)失誤造成損壞