?丹佛斯雙聯(lián)柱塞泵 工作原理：丹佛斯雙聯(lián)柱塞泵將兩個相同形狀的圓柱塞入兩個相同形狀的泵腔內(nèi)，并在泵腔內(nèi)通過不同位置對柱塞產(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力，這就是泵的工作原理當柱塞不能按設計規(guī)定的壓力運行時（可根據(jù)實際情況）可以按以下幾種原因停機：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；潤滑不良；密封圈損壞或嚴重漏油；泵殼、齒輪磨損嚴重。
停機時將泵放入油箱內(nèi)；待壓力升高后開始泵工作；此時壓力降增大；泵內(nèi)壓力保持不變，當壓力降到一定程度時真空泵突然啟動泵內(nèi)壓力突然升高或下降；發(fā)動機停機時排出柱塞泵內(nèi)壓力持續(xù)下降直到不能繼續(xù)下降；柱塞突然停止動作甚至無法動作；無法繼續(xù)泵注；突然停機；壓力升至正常值；壓力恢復正常后；發(fā)動機起動困難或突然停止泵時；由于泵腔內(nèi)充滿氣體或油液，而不能排出時（此時發(fā)動機空載運轉）可能造成軸承嚴重損壞以及機械零部件損壞。
在工作過程中，當油缸間隙過大時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，造成液壓缸活塞桿彎曲、磨損、軸向竄動和油路漏油，使液壓缸受到污染而產(chǎn)生泄漏，導致缸間隙過大或超過要求密封間隙。
若液壓缸間隙過大，不能達到規(guī)定的密封要求時，應拆下密封墊片更換；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、軸向竄動和油路漏油，使液壓缸受到污染并產(chǎn)生泄漏，導致液壓系統(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)定位置上或不會向外竄動，則說明有缸孔堵塞或彈簧折斷；若壓力不足時，在工作過程中可突然切斷動力而使其停止工作；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，可說明高壓缸嚴重損壞。
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