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使用二通插装阀的液压机液压系统分析
液压机液压系统因其压力高，流量大，液压控制阀适于采用二通插装阀,YA液压机液压系统原理，液压系统的液压控制阀全部采用二通插装阀。系统采用双泵供油，泵1为低压大流量泵,用于上缸和下缸的快速行程;泵2为高压小流量泵，用于系统实现压制及保压。液压系统控制部分包括七个集成块。泵1的调压、安全、卸荷及防止油液倒流由集成块②控制，泵2的调压、安全、卸荷由集成块①控制;上缸运动由集成块⑤和⑥控制;下缸运:动由集成块③和④控制;送料缸由集成块⑦控制。
由于液压系统控制阀除送料缸液压系统外，其余部分采用了二通插装阀;集成块,使液压系统结构紧凑、简单,便于安装、调试和维护。系统的工作性能得以改善:速度快、稳定性好、响应快、精度高,系统配以计算机控制,可方便地实现自动控制。

二通插装阀是插装阀基本组件( 阀芯、阀套、弹簧和密封圈)插到特别设计加工的阀体内，配以盖板、先导阀组成的一种多功能的复合阀。因每个插装阀基本组件有且只有两个油口，故被称为二通插装阀，早期又称为逻辑阀。
1、二通插装阀的特点
二通插装阀具有下列特点:流通能力大，压力损失小，适用于大流量液压系统;主阀芯行程短，动作灵敏，响应快，冲击小;抗油污能力强，对油液过滤精度无严格要求;结构简单，维修方便，故障少，寿命长;插件具有一阀多能的特性，便于组成各种液压回路，工作稳定可靠，插件具有通用化、标准化、系列化程度很高的零件，可以组成集成化系统。
2、二通插装阀的组成
二通插装阀由插装元件、控制盖板、先导控制元件和插装块体四部分组成。图1是二通插装阀的典型结构
控制盖板用以固定插装件，安装先导控制阀，内装棱阀、溢流阀等。控制盖板内有控制油通道，配有一个或多个阻尼螺塞。通常盖板有五个控制油孔:X、Y、Z1、Z2和中心孔a。由于盖板是按通用性来设计的，具体运用到某个控制油路上有的孔可能被堵住不用。为防止将盖板装错，盖板上的定位孔，起标定盖板方位的作用。另外，拆卸盖板之前就必须看清、记牢盖板的安.装方法。
先导控制元件称作先导阀，是小通径的电磁换向阀。块体是嵌入插装元件，安装控制盖板和其它控制阀、沟通主油路与控制油路的基础阀体。插装元件由阀芯、阀套、弹簧以及密封件组成(图3 )。每只插件有两个连接主油路的通口，阀芯的正面称为A口;阀芯环侧面的称作B口。阀芯开启，A口和B口沟通;阀芯闭合，A口和B口之间中断。因而插装阀的功能等同于2位2通阀。故称二通插装阀，简称插装阀。

REXROTH二通插装阀控制盖板LFA32D-7X/FX15

力士乐REXROTH二通插装阀、定向功能，控制盖板LFA..D
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在冶金工业的使用的各种机械和设备进行冶炼、铸锭、轧制、搬运和包装中，又称设备冶金。
冶金机械系统主要由动力系统、传动系统、执行系统、操纵及控制系统组成。
1、动力系统：即机械系统的驱动装置，是机器的动力源，如电机、液压马达等。作为冶金机械其动力源一般采用电动机。
2、执行系统：即机械的工作机构或执行机构，利用机械能来改变作业对象的性质、状态、形状与位置。如起重机的吊钩、轧机的轧辊等。
3、传动系统：在动力源与执行机构间传递运动与动力的中间环节，如减速机；其作用是改变运动形式（转速）或力（力矩）的大小。
4、操纵与控制系统：使机器的各个系统能协调地进行，一般通过人工操作实现操作功能，如离合、制动、变速等。


矿山机械是直接用于矿物开采和富选等作业的机械。包括采矿机械和选矿机械。探矿机械的工作原理和结构与开采同类矿物所用的采矿机械大多相同或相似，广义上说，探矿机械也属于矿山机械。另外，矿山作业中还应用大量的起重机、输送机、通风机和排水机械等。

破碎设备是将矿物进行破碎作业所用的机械设备。
破碎作业常按给料和排料粒度的大小分为粗碎、中碎和细碎。常用的砂石设备有颚式破碎机、反击式破碎机，冲击式破碎机，复合式破碎机，单段锤式破碎机，立式破碎机，旋回破碎机、圆锥式破碎机、辊式破碎机、双辊式破碎机、二合一破碎机、一次成型破碎机等几种。
根据破碎方式、机械的构造特征（动作原理）来划分的，大体上分为六类。
（1）鄂式破碎机（老虎口）。破碎作用是靠可动鄂板周期性地压向固定鄂板，将夹在其中的矿块压碎。
（2）圆锥破碎机。矿块处于内外两圆锥之间，外圆锥固定，内圆锥作偏心摆动，将夹在其中的矿块压碎或折断。
（3）辊式破碎机。矿块在两个相向旋转的圆辊夹缝中，主要受到连续的压碎作用，但也带有磨剥作用，齿形辊面还有劈碎作用。
（4）冲击式破碎机。矿块受到快速回转的运动部件的冲击作用而被击碎。属于这一类的又可分为：锤碎机；笼式破碎机；反击式破碎机。
（5）磨矿机。矿石在旋转的圆筒内受到磨矿介质（钢球、钢棒、砾石或矿块）的冲击与研磨作用而被粉碎。
（6）其他类型的破碎磨矿机。

采矿机械是直接开采有用矿物和采准工作所用的机械设备，包括：开采金属矿石和非金属矿石的采掘机械；开采煤炭用的采煤机械；开采石油用的石油钻采机械。
采掘机械用于井下和露天矿山开采的采掘机械有：钻炮孔用的钻孔机械；挖装矿岩用的挖掘机械和装卸机械；钻凿天井、竖井和平巷用的掘进机械。
钻孔机械分为凿岩机和钻机两类，钻机又有露天钻机和井下钻机之分。
掘进机械利用刀具的轴向压力和回转力对岩面的辗压作用，直接破碎矿岩的成巷或成井机械设备。所用刀具有盘形滚刀、楔齿滚刀、球齿滚刀和铣削刀具。按掘进巷道的不同，分为天井钻机、竖井钻机和平巷掘进机。
综合机械化采煤广泛应用浅截深式双(单)滚筒联合采煤机（或刨煤机）、可弯曲刮板输送机和液压自移支架等设备，使回采工作面的破碎落煤、装煤、运输、支护等环节实现全面的综合机械化。双滚筒采煤机是落煤机械。电动机经截割部分减速机把动力传递给螺旋滚筒落煤，机器的移动靠电动机经牵引部分传动装置来实现。牵引方式基本上有两种，即锚链牵引和无锚链牵引。锚链牵引借助牵引部分的链轮与固定在运输机上的锚链啮合而实现。
陆地石油钻采机械。按开采工序分为钻井机械、采油机械、修井机械和维持油井高产的压裂、酸化机械。钻井机械为开发石油或天然气而钻探或打生产井的全套机械设备。石油钻井机，包括井架、绞车、动力机、泥浆循环系统、滑车装置系统、转盘、井口装置和电气控制系统。井架用于装置天车、游动滑车和大钩等，吊升其他重物上下钻台，悬挂井内钻具进行钻进。
选矿机械是在所采集的矿物原料中，根据各种矿物物理性质、物理化学性质和化学性质的差异选出有用矿物的过程。实施这种过程的称为选矿机械。选矿机械按选矿流程分为破碎、粉磨、筛分、分选（选别）和脱水机械。破碎机械常用的有颚式破碎机、旋回破碎机、圆锥破碎机、辊式破碎机和反击式破碎机等。