德國REXROTH液壓泵4WRA10E1-60-22/G24K4/V

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REXROTH液壓泵0510225006  柱塞泵柱塞往復(fù)運(yùn)動行程L是不變的，由凸輪的升程決定。柱塞每循環(huán)的供油量大小取決于供油行程,供油行程不受凸輪軸控制是可變的。供油開始時(shí)刻不隨供油行程的變化而變化。轉(zhuǎn)動柱塞可改變供油終了時(shí)刻，從而改變供油量。柱塞泵工作時(shí)，在噴油泵凸輪軸上的凸輪與柱塞彈簧的作用下，迫使柱塞作上、下往復(fù)運(yùn)動，從而完成泵油任務(wù)當(dāng)凸輪的凸起部分轉(zhuǎn)過去后，在彈簧力的作用下，柱塞向下運(yùn)動，柱塞上部空間（稱為泵油室）產(chǎn)生真空度，當(dāng)柱塞上端面把柱塞套上的進(jìn)油孔打開后，充滿在油泵上體油道內(nèi)的柴油經(jīng)油孔進(jìn)入泵油室，柱塞運(yùn)動到下止點(diǎn)，進(jìn)油結(jié)束柱塞向上供油，當(dāng)上行到柱塞上的斜槽（停供邊）與套筒上的回油孔相通時(shí)，泵油室低壓油路便與柱塞頭部的中孔和徑向孔及斜槽溝通，油壓驟然下降，出油閥在彈簧力的作用下迅速關(guān)閉，停止供油。此后柱塞還要上行，當(dāng)凸輪的凸起部分轉(zhuǎn)過去后，在彈簧的作用下，柱塞又下行。此時(shí)便開始了下一個(gè)循環(huán)。柱塞泵以一個(gè)柱塞為原理介紹，一個(gè)柱塞泵上有兩個(gè)單向閥，并且方向相反，柱塞向一個(gè)方向運(yùn)動時(shí)缸內(nèi)出現(xiàn)負(fù)壓，這時(shí)一個(gè)單向閥打開液體被吸入缸內(nèi)，柱塞向另一個(gè)方向運(yùn)動時(shí)，將液體壓縮后另一個(gè)單向閥被打開，被吸入缸內(nèi)的液體被排出。這種工作方式連續(xù)運(yùn)動后就形成了連續(xù)供油 。采用補(bǔ)油泵供油的柱塞泵，使用3000h后，操作人員每日需對柱塞泵檢查1-2次，檢查液壓泵運(yùn)轉(zhuǎn)聲響是否正常。如發(fā)現(xiàn)液壓缸速度下降或悶車時(shí)，就應(yīng)該對補(bǔ)油泵解體檢查，檢查葉輪邊沿是否有刮傷現(xiàn)象，內(nèi)齒輪泵間隙是否過大。對于自吸油型柱塞泵，液壓油箱內(nèi)的油液不得低于油標(biāo)下限，要保持足夠數(shù)量的液壓油。液壓油的清潔度越高，液壓泵的使用壽命越長。柱塞泵重要的部件是軸承，如果軸承出現(xiàn)游隙，則不能保證液壓泵內(nèi)部三對磨擦副的正常間隙，同時(shí)也會破壞各磨擦副的靜液壓支承油膜厚度，降低柱塞泵軸承的使用壽命。據(jù)液壓泵制造廠提供的資料，軸承的平均使用壽命為10000h，過此值就需要更換新口。拆卸下來的軸承，沒有檢測儀器是無法檢測出軸承的游隙的，只能采用目測，如發(fā)現(xiàn)滾柱表面有劃痕或變色，就必須更換。柱塞泵使用壽命的長短，與平時(shí)的維護(hù)保養(yǎng)，液壓油的數(shù)量和質(zhì)量，油液清潔度等有關(guān)。避免油液中的顆粒對柱塞泵磨擦副造成磨損等，也是延長柱塞泵壽命的有效途徑。在維修中更換零件應(yīng)盡量使用原廠生產(chǎn)的零件，這些零件有時(shí)比其它仿造的零件價(jià)格要貴，但質(zhì)量及穩(wěn)定性要好，如果購買售價(jià)便宜的仿造零件，短期內(nèi)似乎是節(jié)省了費(fèi)用，但由此出帶來了隱患，也可能對柱塞泵的使用造成更大的危害。

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德國REXROTH液壓泵4WRA10E1-60-22/G24K4/V

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德國REXROTH液壓泵4WRA10E1-60-22/G24K4/V