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电磁阀里有密闭的腔，在不同位置开有通孔，每个孔连接不同的油管，腔中间是活塞，两面是两块电磁铁，面的磁铁线圈通电阀体就会被吸引到边，通过控制阀体的移动来开启或关闭不同的排油孔，而进油孔是常开的，液压油就会进入不同的排油管，然后通过油的压力来推动油缸的活塞，活塞又带动活塞杆，活塞杆带动机械装置。这样通过控制电磁铁的电流通断就控制了机械运动。

​电磁阀有很多种类，有控制气动的气动电磁阀，控制液体的液压电磁阀。电磁阀线圈都是套在阀体延伸出来的阀芯上面，分为单线圈和双线圈，阀体和线圈可以分开，阀芯是铁磁性材质做成，靠它在线圈通电时产生的磁力带动阀芯，由阀芯推动阀门完成开或关。电磁阀线圈是用来控制管路开闭大小的，可以单独拿下来。


电磁线圈是通电产生电磁的一种装置。在铁芯的外部缠绕与其功率相匹配的导电绕组，这种通有电流的线圈像磁铁一样具有磁性，它也叫做电磁铁。我们通常把它制成条形或蹄形状，以使铁芯更加容易磁化。另外，为了使电磁铁断电立即消磁，我们往往采用消磁较快的的软铁或硅钢材料来制做。这样的电磁铁在通电时有磁性，断电后磁就随之消失。电磁铁在我们的日常生活中有着极其广泛的应用，由于它的发明也使发电机的功率得到了很大的提高。
​

插装阀在液压系统中的应用.
插装阀具有内阻小，结构简单，工作可靠，标准化程度高，对于大流量、高压力、较复杂的液压系统可以显著的减小尺寸和重量等特点;而实心胎硫化机组液压系统工作时需要大流量、高压力油，因而，此系统可以应用插装阀满足要求。
一、
插装阀的工作原理及特点
插装阀是另一类液压控制阀的统称。其基本核心元件是一种液控型、单控制口的装于油路主级中的两通液阻单元(故又称二通插装阀)。将一一个或若干个插入元件进行不同的组合，并配以相应的先导控制级，可以组成插装阀的各种控制功能单元。比如方向控制功能单元、压力控制单元、流量控制单元、复合控制功能单元。
插装阀具有以下特点:内阻小，适宜大流量工作，阀口多数采用锥面密封，因而泄漏小，对于乳化液等地粘度的工作介质也适宜，结构简单、工作可靠、标准化程度高;对于大流量、高压力、较复杂的液压系统可以显著的减小尺寸和重量。
其结构:先导阀，控制盖板，插装件。
它是由插入元件、控制盖板、通道块三部分组成。插入元件有阀芯、阀套、弹簧和密封件组成;控制盖板上根据插装阀的不同控制功能，安装有相应的先导控制级元件;通道块既是嵌入插入元件及安装控制盖板的基础阀体，又是主油路和控制油路的连通体。其中A、B为主油路通口，C为控制油路通口。A、B、C油口的压力和作用面积分别为PA、PB、PC和A1、A2、A3，A3=A1+A2， Fs为弹簧作用力。
二通插装阀通过不同的盖板和各种先导阀组合，便可构成方向控制阀、压力控制阀和流量控制阀。
1、插装阀构成压力控制阀
根据插装阀的工作原理当PAA1+PBA2 >PCA3+FS时，阀芯开启，油路A、B接通。插装阀C14，当电磁阀得电时，插装阀C14的C口直接通油箱，其C口压力为零。由此可知油路A、B接通，当A口的压力大于弹簧力的时候，系统压力油回油箱，所以此插装阀起溢流阀的作用，控制油缸径油口压力。
2、插装阀构成方向控制阀
由液压动作程序表可知，同时得电,来控制主油缸上行运动。当两者同时得电时插装阀C11、C13的C口通油箱PA>FS时,A、B口直接相通，油液可从A流向B口;当只有一个电磁阀得电时，主油缸下行运动。其中C13的PA3、插装阀构成流量控制阀
在阀的顶盖上有阀芯升高限位装置通过调节限位装置的位置，便可调节阀口通流截面的大小，从而调节了流量。通过调节流量，可调节主油缸的下行速度。此插装阀作节流阀。
三、
插装阀在液压系统的简单应用，通过更为复杂的组合，可以实现更多的液压阀的功能。通过组合，插装阀可作为压力控制阀(顺序阀、减压阀)、流量控制阀(单向节流阀、节流阀)、方向控制阀(调速阀、液控单向阀、两位两通换向阀等)以及复合阀。

力士乐电磁阀线圈R901090828 24VDC，德国REXROTH电磁阀线圈，力士乐螺纹插装阀线圈；​

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R409007235 SPOLE F OD 15-31-56 L540953
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​组合机床动力滑台液压系统
动力滑台是组合机床的一种通用部件，在滑台上可以配置各种工艺用途的切削头。机床液压动力滑台可以实现多种不同的工作循环，其中一种比较典型的工作循环是：快进→ 一工进→二工进→死挡铁停留→快退→停止。 使液压缸差动联接以实现快速运动； 系统中采用限压式变量叶片泵供油； 用行程阀、液控顺序阀实现快进与工进的转换； 电液换向阀 使液压缸差动联接和变量泵以实现快速运动；
（1）快进 按下启动按钮，三位五通电液动换向阀5的先导电磁换向阀1YA得电，使之阀芯右移，左位进入工作状态。 用二位二通电磁换向阀实现一工进和二工进之间的速度换接。
（2）一次工作在快进行程结束，滑台上的挡铁压下行程阀。 用行程阀、液控顺序阀实现快进与工进的转换； 用二位二通电磁换向阀实现一工进和二工进之间的速度换接。
（3）第二次工作进给 为保证进给的尺寸精度，采用了死挡铁停留来限位。
（4）死挡铁停留 当动力滑台第二次工作进给终了碰上死挡铁后，液压缸停止不动，系统的压力进一步升高，达到压力继电器15的调定值时，经过时间继电器的延时，再发出电信号，使滑台退回。在时间继电器延时动作前，滑台停留在死挡块限定的位置上。
（5）快退 时间继电器发出电信号后，电液换向阀右位工作。 这时系统的压力较低，变量泵2输出流量大，动力滑台快速退回。由于活塞杆的面积大约为活塞的一半，所以动力滑台快进、快退的速度大致相等。
（6）原位停止 当动力滑台退回到原始位置时，挡块压下行程开关，电液换向阀处于中位，动力滑台停止运动，变量泵卸荷。


液压系统及液压元件介绍
一、液压系统的组成：动力部分、控制部分、执行部分、辅助装置 液压泵；用以将机械能转化为液体的压力能，有时也将蓄能器作为紧急或辅助动力源
各类压力、流量、方向等控制阀；用以实现对执行元件的运动速度、方向、作用力等的控制、也用于实现过载保护、程序控制等
液压缸、液压马达等；用以将液体压力转化为机械能
管路、蓄能器、过滤器、油箱、冷却器、加热器、压力表、流量计等
二、液压传动的优点 质量轻体积小 容易实现无级调速 易于实现过载保护 液压元件能够自动润滑 简化机构 便于实现自动化 
三、液压传动的缺点 液压元件制造精度要求高 实现定比传动困难 油液受温度的影响 不适宜远距离输送动力 油液中混入空气易影响工作性能 油液容易污染 发生故障不易检查和排除。 四、液压部件及图形符号 




液压是机械行业、机电行业的一个名词。液压可以用动力传动方式， 成为液压传动。液压也可用作控制方式，称为液压控制。
液压传动是以液体作为工作介质，利用液体的压力能来传递动力。
液压控制是以有压力液体作为控制信号传递方式的控制。用液压技术构成的控制系统称为液压控制系统。液压挖制通常包括液压开环挖制和液压闭环控制。液压闭环挖制也就是液压伺服控制，它构成液压伺服系统，通常包括电气液压伺服系统(电液伺服系统)和机械液压同服系统(机液伺服系统，或机液伺服机构)等。
一个完整的液压系统由五个部分组成，即能源装置、执行装置、控制调节装置、辅助装置、液体介质。液压由于其传递动力大，易于传递及配置等特点，在工业、民用行业应用广泛。液压系统的执行元件(液压缸和液压马达)的作用是将液体的压力能转换为机械能，从而获
得需要的直线往复运动或回转运动。液压系统的能源装置(液压泵)的作用是将原动机的机械能转换成液体的压力能。
液压系统组成
一个完整的液压系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件和工作介质。
动力元件的作用是将原动机的机械能转换成液体的压力能。动力元件指液压系统中的液压泵，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、柱塞泵、螺杆泵。
执行元件的作用是将液体的压力能转换为机械能，驱动负载作直线往复运动或回转运动。执行元件有液压缸和液压马达。
挖制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。


根据控制功能的不同，液压阀可分为压力控制阀、流量挖制阀和方向控制阀。压力挖制阀又分为溢流阀(安全阀)、减压阀、顺序阀、压力继电器等:流量控制阀包括节流阀、调整阀、分流集流阀等:方向控制阀包括单向阀、液挖单向阀、梭阀、换向阀等。根据控制方式不同，
液压阀可分为开关式控制阀、定值控制阀和比例控制阀。
辅助元件包括蓄能器、过滤器、冷却器、加热器、油管、管接头、油箱、压力计、流量计、
密封装置等，它们起连接、储油、过滤和测量油液压力等辅助作用
工作介质是指各类液压传动中的液压油或乳化液，有各种矿物油、乳化液和合成型液压油等
几大类。液压系统就是通过其实现运动和动力传递的。
液压元件可分为动力元件和挖制元件以及执行元件三类。尽管都是液压元件，它们的自身
功能和安装使用的技术要求也不尽相同，现分别介绍如下:
动力元件:指的是各种液压泵，齿轮泵、叶片泵、柱塞泵、螺杆泵。
1、齿轮油泵和串联泵(包括外啮合与内啮合)两种结构型式。
2、叶片油泵(包括单级泵、变量泵、双级泵、双联泵)。
3、柱塞油泵，又分为轴向柱塞油泵和径向柱塞油泵，轴向柱塞泵有定量泵、变量泵、(变量泵又分为手动变量与压力补偿变量、伺服变量等多种)从结构上又分为端面配油和阀式配油两种配油方式，而径向柱塞泵的配油型式，基本上为阀式配油。);
执行元件:液压缸和液压马达，液压缸有活塞液压缸、柱塞液压缸、摆动液压缸、组合液压缸:液压马达有齿轮式液压马达、叶片液压马达、柱塞液压马达:
控制元件:方向控制阀、单向阀、换向阀;
压力控制阀:溢流阀、减压阀、顺序阀、压力继电器等:
流量控制阀:节流阀、调速阀、分流阙:
辅助元件:除上述三部分以外的其它元件，包括压力表、滤油器、蓄能装置、冷却器、管件{主要包括:各种管接头 (扩口式、 焊接式、卡套式，sae法兰)、高压球阀、快换接头、软管总成、测压接头、管夹等}及油箱等，它们同样十分重要。