?丹佛斯雙聯(lián)柱塞泵 工作原理：丹佛斯雙聯(lián)柱塞泵將兩個(gè)相同形狀的圓柱塞入兩個(gè)相同形狀的泵腔內(nèi)，并在泵腔內(nèi)通過不同位置對(duì)柱塞產(chǎn)生力矩，而使泵出口具有一定的壓力并能提供更大限度的動(dòng)力，這就是泵的工作原理當(dāng)柱塞不能按設(shè)計(jì)規(guī)定的壓力運(yùn)行時(shí)（可根據(jù)實(shí)際情況）可以按以下幾種原因停機(jī)：泵不出油：柱塞密封圈老化和堵塞引起回位或損壞；壓力低；油量不足；泵內(nèi)有異物；潤(rùn)滑不良；密封圈損壞或嚴(yán)重漏油；泵殼、齒輪磨損嚴(yán)重。
停機(jī)時(shí)將泵放入油箱內(nèi)；待壓力升高后開始泵工作；此時(shí)壓力降增大；泵內(nèi)壓力保持不變，當(dāng)壓力降到一定程度時(shí)真空泵突然啟動(dòng)泵內(nèi)壓力突然升高或下降；發(fā)動(dòng)機(jī)停機(jī)時(shí)排出柱塞泵內(nèi)壓力持續(xù)下降直到不能繼續(xù)下降；柱塞突然停止動(dòng)作甚至無法動(dòng)作；無法繼續(xù)泵注；突然停機(jī)；壓力升至正常值；壓力恢復(fù)正常后；發(fā)動(dòng)機(jī)起動(dòng)困難或突然停止泵時(shí)；由于泵腔內(nèi)充滿氣體或油液，而不能排出時(shí)（此時(shí)發(fā)動(dòng)機(jī)空載運(yùn)轉(zhuǎn)）可能造成軸承嚴(yán)重?fù)p壞以及機(jī)械零部件損壞。
在工作過程中，當(dāng)油缸間隙過大時(shí)容易造成液壓缸回路堵塞，液壓缸阻力增大，液壓缸行程變短，液壓系統(tǒng)工作壓力降低液壓缸間隙過大時(shí)，造成液壓缸活塞桿彎曲、磨損、軸向竄動(dòng)和油路漏油，使液壓缸受到污染而產(chǎn)生泄漏，導(dǎo)致缸間隙過大或超過要求密封間隙。
若液壓缸間隙過大，不能達(dá)到規(guī)定的密封要求時(shí)，應(yīng)拆下密封墊片更換；若液壓缸間隙過大，缸內(nèi)壓降增大，使缸體受力變大，引起活塞桿彎曲、軸向竄動(dòng)和油路漏油，使液壓缸受到污染并產(chǎn)生泄漏，導(dǎo)致液壓系統(tǒng)發(fā)生泄漏；若液壓缸間隙過大，但活塞桿仍能保持在規(guī)定位置上或不會(huì)向外竄動(dòng)，則說明有缸孔堵塞或彈簧折斷；若壓力不足時(shí)，在工作過程中可突然切斷動(dòng)力而使其停止工作；若高壓液壓缸間隙過大，不引起油壓下降和壓力升高而造成油缸壓傷或拉傷；若壓力下降幅度大且穩(wěn)定不變時(shí)，可說明高壓缸嚴(yán)重?fù)p壞。
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