VT-SWA-1-12/DFEE力士乐摆角传感器

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液压传动系统的组成

1、液压动力原件

将动力装置的机械能转换成为液压能的装置，其作用是为液压传动系统提供压力油,是液压传动系统的动力源。例如液压泵。

1.1液压泵

液压泵是液压系统的动力元件，其作用是将原动机的机械能转换成液体的压力能,指液压系统中的油泵，它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。

1.2齿轮泵

齿轮泵即依靠密封在个壳体中的两个或两个以上齿轮,在相互啮合过程中所产生的工作空间容积变化来输送液体的泵。齿轮泵的概念是很简单的，即它的基本形式就是两个尺寸相同的齿轮在一个紧密配合的壳体内相互啮合旋转，这个壳体的内部类似“8”字形，两个齿轮装在里面,齿轮的外径及两侧与壳体紧密配合。来自于挤出机的物料在吸入口进入两个齿轮中间，并充满这一空间，随着齿的旋转沿壳体运动，后在两齿啮合时排出。困油现象齿轮泵要平稳工作，齿轮啮合的重合度必须大于1, 于是总有两对齿轮同时啮合, :并有一部分油液被围困在两对轮齿所围成的封闭容腔之间。这个封闭的容腔开始随着

齿轮的转动逐渐减小，以后又逐渐加大。封闭腔容积的减小会使被困油液受挤压而产生很高的压力，并且从缝隙中挤出，导致油液发热，并致使机件受到额外的负载，而封闭腔容积的加大又造成局部真空，使油液中溶解的气体分离，产生气穴现象。这些都将产生强烈的振动和噪音，这就是齿轮泵的困意现象。

危害：径向不平衡力很大时能使轴弯曲，齿顶与壳体接触，同时加速轴承的磨损，降低轴承的寿命。

消除困油现象方法:通常是在两侧盖板上开卸荷槽，使封闭腔容积诚小时通过左边的卸荷槽与压油腔相通，容积加大时通过右边的卸荷槽与吸油腔相通。

1.3叶片泵

叶片泵即通过叶轮的旋转，将动力机的机械能转换为水能(势能、动能、压能)的水力机械。

叶片泵转子旋转时，叶片在离心力和压力油的作用下，尖部紧贴在定子内表面上。这样两个叶片与转子和定子内表面所构成的工作容积，先由小到大吸油后再由大到小排油，叶片旋转一周时，完成两次吸油与排油。

1.4柱塞泵

柱塞泵即利用柱塞在泵缸体内往复运动，使柱塞与泵壁间形成容积改变，反复吸入和排;出液体并增高其压力的泵。

柱塞泵是液压系统的一个重要装置。它依靠柱塞在缸体中往复运动，使密封工作容腔的容积发生变化来实现吸油、压油。柱塞泵具有额定压力高、结构紧凑、效率高和流量调节方便等优点，被广泛应用于高压、大流量和流量需要调节的场合，诸如液压机、工程机械和船舶中。

液压伺服控制系统

以伺服控制元件完成动力与运动方向控制，综合压力、流量、方向控制为一体，利用偏差控制进行纠偏，以满足精度控制需要，必须为闭环控制，可实现较高频率( 100HZ以上) ,有滑阀式、喷嘴挡板式、射流管式等，常采用机械伺服、电液伺服、气液伺服。

 

液压伺服系统分类:

(1)按输入的信号变化规律分类:定值控制系统、程序控制系统和伺服系统三类。当系统输入信号为定值时，称为定值控制系统，其基本任务是提高系统的抗干扰能力。当系统的输入信号按预先给定的规律变化时，称为程序控制系统。伺服系统也称为随动系统，其输入信号是时间的未知函数，输出量能够准确、迅速地复现输入量的变化规律。

(2)按输入信号的不同分类:机液伺服系统、电液伺服系统、气液伺服系统等。

(3)按输出的物理量分类:位置伺服系统、速度伺服系统、力(或压力)伺服系统等。

(4)按控制元件分类:阀控系统和泵控系统。在机械设备中，阀控系统应用较多。

 

 

液压伺服系统的特点如下:

(1)反馈。把输出量的一部分或全部按一定方式回送到输入端，并和输入信号进行比较，这就是反馈。在上例中，反馈(检测时速装置输出)电压和给定(输入信号)电压是异号的，即反馈信号不断地抵消输入信号，这是负反馈。自动控制系统大多数是负反馈。

(2)偏差。要使液压缸输出一定的力和速度，伺服阀必须有一定的开口量，因此输入和输出之间必须有偏差信号。液压缸运动的结果又力图消除这个误差。但在伺服系统工作的任何时刻都不能完全消除这一-偏差，伺服系统正是依靠这一-偏差信号进行工作的。

(3)放大。执行元件(液压缸)输出的力和功率远远大于输入信号的力和功率，其输出的能量是液压能源供给的。

(4)跟进。液压缸的输出量完全跟进输入信号的变化。

VT-SWA-1-12/DFEE力士乐摆角传感器

力士乐REXROTHA10VSO轴向柱塞泵SYDFE控制系统摆角传感器、旋转角度传感器

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力士乐REXROTH电动液压控制系统

零配件

力士乐REXROTH带电气位置反馈直动式三位三通比例方向阀作为SYDFE控制系统的先导阀

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