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液壓系統的組成及其作用
一個完整的液壓系統由五個部分組成，即動力元件、執行元件、控制元件、輔助元件(附件)和液壓油。
動力元件的作用是將原動機的機械能轉換成液體的壓力能，指液壓系統中的油泵，它向整個液壓系統提供動力。液壓泵的結構形式一般有齒輪泵、葉片泵和柱塞泵。
執行元件(如液壓缸和液壓馬達)的作用是將液體的壓力能轉換為機械能，驅動負載作直線往復運動或回轉運動。
控制元件(即各種液壓閥)在液壓系統中控制和調節液體的壓力、流量和方向。根據控制功能的不同，液壓閥可分為村力控制閥、流量控制閥和方向控制閥。壓力控制閥又分為益流閥(安全閥)、誠壓閥、順序閥、壓力繼電器等;流量控制閥包括節流閥、調整閥、分流集流閥等，方向控制閥包括單向閥、液控單向閥、梭閥、換向閥等。根據控制方式不同，液壓閥可分為開關式控制閥、定值控制閥和比例控制閥。
輔助元件包括油箱、濾油器、油管及管接頭、密封圈、快換接頭、高壓球閥、膠管總成、測壓接頭、壓力表、油位油溫計等。
液壓油是液壓系統中傳遞能量的工作介質，有各種礦物油、乳化液和合成型液壓油等幾大類。
液壓系統結構
液壓系統由信號控制和液壓動力兩部分組成，信號控制部分用于驅動液壓動力部分中的控制閥動作。
液壓動力部分采用回路圖方式表示，以表明不同功能元件之間的相互關系。液壓源含有液壓泵、電動機和液壓輔助元件;液壓控制部分含有各種控制閥，其用于控制工作油液的流量、壓力和方向;執行部分含有液壓缸或液壓馬達，其可按實際要求來選擇。
在分析和設計實際任務時，一般采用方框圖顯示設備中實際運行狀況。空心箭頭表示信號流，而實心箭頭則表示能量流。
基本液壓回路中的動作順序一控制元件(二位四通換向閥)的換向和彈簧復位、執行元件(雙作用液壓缸)的伸出和回縮以及溢流閥的開啟和關閉。對 于執行元件和控制元件，演示文稿都是基于相應回路圖符號，這也為介紹回路圖符號作了準備。
根據系統工作原理，您可對所有回路依次進行編號。如果一個執行元件編號為0，則與其相關的控制元件標識符則為1。如果與執行元件伸出相對應的元件標識符為偶數，則與執行元件回縮相對應的元件標識符則為奇數。不僅應對液壓回路進行編號，也應對實際設備進行編號，以便發現系統故障。
DIN ISO1219-2 標準定義了元件的編號組成，其包括下面四個部分，設備編號、回路編號、元件標識符和元件編號。如果整個系統僅有一種設備，則可省略設備編號。
實際中，另一種編號方式就是對液壓系統中所有元件進行連續編號，此時，元件編號應該與元件列表中編號相一致。這種方法特別適用于復雜液壓控制系統，每個控制回路都與其系統編號相對應。
柱塞泵分為軸向柱塞泵和徑向柱塞泵兩種代表性的結構形式;由于徑向柱塞泵屬于一種新型的技術含量比較高的高效泵,隨著國產化的不斷加快，徑向柱塞泵必然會成為柱塞泵應用領域的重要組成部分。
柱塞泵是往復泵的一種，屬于體積泵 ,其柱塞靠泵軸的偏心轉動驅動往復運動,其吸入和排出閥都是單向閥。當柱塞外拉時，工作室內壓力降低，出口閥關閉,低于進口壓力時,進口閥打開,液體進入;柱塞內推時,工作室壓力升高,進口閥關閉,高于出口壓力時,出口閥打開,液體排出。
內帶滑靴結構的軸向柱塞泵是目前使用*廣泛的軸向柱塞泵,安放在缸體中的柱塞通過滑靴與斜盤相接觸,當傳動軸帶動缸體旋轉時,斜盤將柱塞從缸體中拉出或推回,完成吸排油過程。柱塞與缸孔組成的工作容腔中的油液通過配油盤分別與泵的吸、排油腔相通。變量機構用來改變斜盤的傾角,通過調節斜盤的傾角可改變泵的排量。
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攪拌車液壓泵壓力不足的原因、診斷和排除方法
(1)攪拌車液壓泵是否能輸出油液壓油。
若無液壓油輸出，則可能是泵的轉向不對，零件磨損嚴重或損壞;吸油管阻力過大(濾油器阻塞、油液黏度過大等)或漏氣。如果是新的液壓泵，可能是泵體有鑄造缺陷(縮孔、砂眼等)，使吸油腔和壓油腔相通，失去壓油能力，輸入功率不足，使泵的輸油壓力達不到工作壓力，泵軸扭斷，而輸不出油
若液壓泵有油液輸出，則應檢查各回油管，觀察哪個部件溢由。如溢流閥回油管溢油，可能是調定壓力低。此時，擰緊易誘發調壓彈簧，若壓力無變化，則可能是溢流閥主閥芯或先導部分的錐因臟物或銹蝕而卡死在開口位置;或因彈簧折斷失去作用;或因阻尼孔被臟物阻塞，泵輸出的油液立即經溢流閥流回油箱。排除方法：應拆開溢流閥，加以清洗。檢查或更換彈簧，恢復其工作性能
(2)溢流閥工作是否正常。
若不正常，則可能是壓力油路中的某個閥有污物或其它原因卡住，處于回油位置，致使壓力油路與溢流回路短路，也可能是管接頭松脫，或處于壓力油路中的某些閥泄漏嚴重，或液壓缸、液壓馬達的密封損壞，嚴重泄漏。排除方法：拆開有關閥進行清洗，檢查密封尖刺的發小及各種，密封裝置，密封裝置損壞應更換
(3)若整個攪拌車液壓系統能建立正常壓力，而某些管路或液壓缸(或液壓馬達)中無壓力，則可能是由于管路、小孔或節流閥、換向閥等部位堵塞。此時，應鑄段檢查壓力和有無油液通過，找出原因，加以排除
(4)若液壓泵輸出流量隨壓力升高而顯著減小，且壓力大達不到規定值，則是由于液壓泵磨損后間隙增大所致。排除方法：測定液壓泵的容積效率，即可確定該泵是否能繼續使用，對磨損嚴重的零件，應進行修配或更換
注塑機液壓泵是否正常工作，除了系統的良好設計、元件制造的質量和維護使用等條件外，液壓油選擇使用清潔度也是十分重要的因素。液壓油作為液壓傳動的工作介質除了傳動傳遞能量，還有潤滑元件部位的而保護金屬不被銹蝕泵作用。
有70%的液壓泵的故障是由于液壓油的選用不合適或使用、保管不善，使液壓油受到污染造成的。因此，必須了解液壓系統對用油的各種要求，合理的選用、正確在維護保管，才能保證液壓泵正常運行，少出故障，提高生產效率
液壓油選擇的要求
(1) 黏度合適，并且具有較好的粘溫也行。若液壓油黏度太大，則系統的壓力損失大，效率較低，并且磨損增加，降低泵的使用壽命;如果液壓油的黏度太小，則系統易泄漏，系統的效率也較低，因此，液壓油的黏度要選擇合理，不要偏大也不要偏小。
液壓油的黏度會隨溫度的變化而變化，溫度升高時，液壓油的黏度下降。油液黏度隨溫度變化的性能叫粘溫特性，常用黏度指數表示。黏度指數較高，油液的粘溫特性就特好，溫度變化時，黏度變化小。液壓油的黏度指數一般高于90.
(2) 在工作溫度和壓力下，具有良好的潤滑性、剪切穩定性和一定的油膜強度。液壓泵工作元件總是在產生摩擦和磨損的，機器停止、啟動時，摩擦力較大，啟動時摩擦力為*大，易引起磨損。因此，液壓油要具有良好的潤滑性，運動起到潤滑作用，達到減少磨損。
液壓油要具有良好的潤滑性，對運動部件起到潤滑作用，達到減少磨損，延長使用壽命的目的。在高溫、高壓、高速的條件下工作的葉阿姨系統，更要求液壓油要具有良好的潤滑性，也就是有高的油膜強度，即耐磨要好。
(3) 具有較好的抗氧化性。液壓泵工作時有較高的壓力和溫度，需要液壓油在這樣的條件下不變質老化，不出現瀝青、焦油等膠質沉淀。
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