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O形(xing)密封(feng)圈在低(di)壓(ya)下使用時(shi)，CDCG250系列重載液壓(ya)缸廠，與U形(xing)密封(feng)圈比較(jiao)，由于(yu)面壓(ya)較(jiao)高、動靜摩擦阻力之差較(jiao)大，容(rong)易產生滑(hua)移或爬(pa)行；U型密封(feng)圈的(de)面壓(ya)隨著壓(ya)力的(de)提高而增大，雖然密封(feng)效果也相應提高，但動靜摩擦阻力之差也變(bian)大，泊于(yu)鎮液壓(ya)缸廠，內(nei)壓(ya)增加，拉桿式液壓(ya)缸廠，影響橡膠(jiao)彈性，由于(yu)唇緣(yuan)的(de)接觸阻力增大，密封(feng)圈將會(hui)傾翻及唇緣(yuan)伸長，也容(rong)易引(yin)起滑(hua)移或爬(pa)行，為(wei)防止其傾翻可采用支承環保持(chi)其穩定。

擺動式液壓缸

擺(bai)動(dong)(dong)(dong)式(shi)液(ye)壓缸(gang)(gang)是輸出扭(niu)矩并實現(xian)往復(fu)運動(dong)(dong)(dong)的執行元件，有單(dan)葉(xie)片(pian)(pian)、雙葉(xie)片(pian)(pian)、螺(luo)旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)等幾(ji)種形式(shi)。葉(xie)片(pian)(pian)式(shi)式(shi)：定(ding)子(zi)(zi)塊固定(ding)在(zai)(zai)缸(gang)(gang)體上，而(er)葉(xie)片(pian)(pian)和轉(zhuan)子(zi)(zi)連接在(zai)(zai)一起(qi)。根據(ju)進油(you)方向，葉(xie)片(pian)(pian)將帶動(dong)(dong)(dong)轉(zhuan)子(zi)(zi)作往復(fu)擺(bai)動(dong)(dong)(dong)。螺(luo)旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)式(shi)又分單(dan)螺(luo)旋(xuan)(xuan)擺(bai)動(dong)(dong)(dong)和雙螺(luo)旋(xuan)(xuan)兩種，現(xian)在(zai)(zai)雙螺(luo)旋(xuan)(xuan)比較常(chang)用(yong)，靠兩個(ge)螺(luo)旋(xuan)(xuan)副(fu)降(jiang)液(ye)壓缸(gang)(gang)內活塞的直(zhi)線運動(dong)(dong)(dong)轉(zhuan)變為直(zhi)線運動(dong)(dong)(dong)與(yu)自(zi)轉(zhuan)運動(dong)(dong)(dong)的復(fu)he運動(dong)(dong)(dong)，從而(er)實現(xian)擺(bai)動(dong)(dong)(dong)運動(dong)(dong)(dong)。

威(wei)海(hai)力建(jian)冶金(jin)液(ye)(ye)壓(ya)(ya)(ya)設備(bei)廠座落(luo)在膠東半島美(mei)麗的海(hai)濱城(cheng)市----威(wei)海(hai)，主要(yao)生(sheng)產重載液(ye)(ye)壓(ya)(ya)(ya)缸(gang)、標準(zhun)液(ye)(ye)壓(ya)(ya)(ya)缸(gang)、工(gong)(gong)程液(ye)(ye)壓(ya)(ya)(ya)缸(gang)、車輛液(ye)(ye)壓(ya)(ya)(ya)缸(gang)、拉桿多(duo)液(ye)(ye)壓(ya)(ya)(ya)缸(gang)、液(ye)(ye)壓(ya)(ya)(ya)系統等系列(lie)多(duo)種(zhong)(zhong)規格設備(bei)及(ji)液(ye)(ye)壓(ya)(ya)(ya)元件。可以根據用戶需要(yao)設計(ji)(ji)制造(zao)各種(zhong)(zhong)工(gong)(gong)程用、冶金(jin)用標準(zhun)和非(fei)標準(zhun)液(ye)(ye)壓(ya)(ya)(ya)（氣）缸(gang)及(ji)冶金(jin)、礦山、化工(gong)(gong)、交(jiao)通(tong)等行業用液(ye)(ye)壓(ya)(ya)(ya)系統。同時還從事特種(zhong)(zhong)鑄(zhu)造(zao)設備(bei)（離心鑄(zhu)造(zao)機(ji)、低壓(ya)(ya)(ya)鑄(zhu)造(zao)機(ji)）的研發﹑設計(ji)(ji)、制造(zao)及(ji)安裝調(diao)試和咨詢服(fu)務。