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搅拌车从发动机取力器取力，经传动轴带动液压泵工作。液压泵驱动液压马达旋转，经减速器带动搅拌筒旋转。操作系统通过调节液压泵的流量大小和方向，来控制搅拌筒的转速和转向。从而实现进出料及运输搅动的功能。
搅拌车动力由两类底盘全功率取力器输出通过传动轴把动力传给液压泵，液压泵产生液压能通过油管传到液压马达，液压马达把液压能转化为动能并通过减速机减速增扭传递到搅拌罐，通过调节(双作用变量)液压泵的伺服手柄角度从而实现搅拌罐正反转及转速的大小，以实现砼装料、搅拌、搅动、出料等工作。

搅拌车液压泵压力不足的原因、诊断和排除方法
(1)搅拌车液压泵是否能输出油液压油。
若无液压油输出，则可能是泵的转向不对，零件磨损严重或损坏;吸油管阻力过大(滤油器阻塞、油液黏度过大等)或漏气。如果是新的液压泵，可能是泵体有铸造缺陷(缩孔、砂眼等)，使吸油腔和压油腔相通，失去压油能力，输入功率不足，使泵的输油压力达不到工作压力，泵轴扭断，而输不出油
若液压泵有油液输出，则应检查各回油管，观察哪个部件溢由。如溢流阀回油管溢油，可能是调定压力低。此时，拧紧易诱发调压弹簧，若压力无变化，则可能是溢流阀主阀芯或先导部分的锥因脏物或锈蚀而卡死在开口位置;或因弹簧折断失去作用;或因阻尼孔被脏物阻塞，泵输出的油液立即经溢流阀流回油箱。排除方法：应拆开溢流阀，加以清洗。检查或更换弹簧，恢复其工作性能
(2)溢流阀工作是否正常。
若不正常，则可能是压力油路中的某个阀有污物或其它原因卡住，处于回油位置，致使压力油路与溢流回路短路，也可能是管接头松脱，或处于压力油路中的某些阀泄漏严重，或液压缸、液压马达的密封损坏，严重泄漏。排除方法：拆开有关阀进行清洗，检查密封尖刺的发小及各种，密封装置，密封装置损坏应更换
(3)若整个搅拌车液压系统能建立正常压力，而某些管路或液压缸(或液压马达)中无压力，则可能是由于管路、小孔或节流阀、换向阀等部位堵塞。此时，应铸段检查压力和有无油液通过，找出原因，加以排除
(4)若液压泵输出流量随压力升高而显著减小，且压力大达不到规定值，则是由于液压泵磨损后间隙增大所致。排除方法：测定液压泵的容积效率，即可确定该泵是否能继续使用，对磨损严重的零件，应进行修配或更换

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注塑机液压泵是否正常工作，除了系统的良好设计、元件制造的质量和维护使用等条件外，液压油选择使用清洁度也是十分重要的因素。液压油作为液压传动的工作介质除了传动传递能量，还有润滑元件部位的而保护金属不被锈蚀泵作用。
有70%的液压泵的故障是由于液压油的选用不合适或使用、保管不善，使液压油受到污染造成的。因此，必须了解液压系统对用油的各种要求，合理的选用、正确在维护保管，才能保证液压泵正常运行，少出故障，提高生产效率
液压油选择的要求
(1) 黏度合适，并且具有较好的粘温也行。若液压油黏度太大，则系统的压力损失大，效率较低，并且磨损增加，降低泵的使用寿命;如果液压油的黏度太小，则系统易泄漏，系统的效率也较低，因此，液压油的黏度要选择合理，不要偏大也不要偏小。
液压油的黏度会随温度的变化而变化，温度升高时，液压油的黏度下降。油液黏度随温度变化的性能叫粘温特性，常用黏度指数表示。黏度指数较高，油液的粘温特性就特好，温度变化时，黏度变化小。液压油的黏度指数一般高于90.
(2) 在工作温度和压力下，具有良好的润滑性、剪切稳定性和一定的油膜强度。液压泵工作元件总是在产生摩擦和磨损的，机器停止、启动时，摩擦力较大，启动时摩擦力为最大，易引起磨损。因此，液压油要具有良好的润滑性，运动起到润滑作用，达到减少磨损。
液压油要具有良好的润滑性，对运动部件起到润滑作用，达到减少磨损，延长使用寿命的目的。在高温、高压、高速的条件下工作的叶阿姨系统，更要求液压油要具有良好的润滑性，也就是有高的油膜强度，即耐磨要好。
(3) 具有较好的抗氧化性。液压泵工作时有较高的压力和温度，需要液压油在这样的条件下不变质老化，不出现沥青、焦油等胶质沉淀。