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单向阀、液控单向阀、SV/SL型液控单向阀、叠加式液控单向阀
1.结构和工作原理
单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动。单向阀有直通式和直角式两种。
SV和SL型液控单向阀都是座式阀,由液压开启,能给出反向流。
这种阀用来隔离局部压力回路,即作为在管子破裂时防止负载降落的保护,也可防止负载下爬。这种液控单向阀主要包括阀体、主阀、先导阀、压缩弹簧和控制活塞 。
SV型阀(无泄油口)一一泄漏油内部回油
由A口至B口始终可以流动。反方向上则导阀和主阀被压缩弹簧和系统压力保持在阀座上。若X口供给压力油则控制活塞被推向右。
这首先打开导阀,然后打开主阀。于是油液先通过导阀,然后通过主
导阀。为了保证用控制活塞能可靠地操纵,需要一定的低控制压力。
SL型阀(带泄油口)-一-泄漏油外部回油
在原理上,此阀与SV型有相同的功能。不同之处在于增加了泄油口Y,这就可使控制活的环形面积与A口隔离。A口来的油压只作用在控制活塞的面积A4上,从而有效地降低此条件下所需的控制压力。
Z2S型叠加式液控单向阀
Z2S型单向阀是叠加式液控单向阀。它可用于关闭一个或两个工作油口,无泄漏持续时间长,稳定性好。
油液从A到A1或B到B1自由流通,反向则被截止。如果油流通过阀,例
如从A到A1,压力油作用在阀芯上,阀芯则向右运动并推动钢球离开阀座。单向阀被控制油打开时,油可从B1到B流通。压力在B1腔卸荷,单向阀全部开启。为保证两个主单向阀在换向阀中位时能可靠的关闭,阀的A、B口与回油路连接。
2.单向阀的主要故障
单向阀可能出现的主要的故障,是当油液从P2腔反向进入时,锥阀芯(或钢球)不能将油液严格封闭而产生渗漏。这种渗漏现象更容易出现在反向流油的压力比较低的情况。这时需要检查阀芯锥面(或钢球)与阀座的接触是否紧密;或检查阀座孔与阀芯孔是否保证所需要的同轴度要求,或者当阀座压入阀体孔时有没有压歪。如不符合要求,则需将阀芯锥面(或钢球)与阀座重新配研,或者将阀座拆出重新压装,直到与阀芯锥面(或钢球)严密接触为止。
另外单向阀的阀座或阀套与阀体间的密封装配或拆装时挤伤,而造成内部泄漏。
如果单向阀启闭不灵活,这种阀芯有卡阻现象,则需检查阀体孔与阀芯的加工几何精度,以及二者的配合间隙是否符合要求。这种现象有可能出现于正向开启压力很小的单向阀,或者这种开启压力很小的单向阀是阀芯轴线沿水平方向安装使用时的场合;另外,也应检查弹簧是否断裂或者过分弯曲而引起卡阻。这里应该注意的是,不论是直通型单向阀还是直角型单向阀,都不允许阀芯锥面向上安装。
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*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*有盘形滚刀、楔齿滚刀、球齿滚刀和铣削*。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。
Z2S6-2-64/V力士乐叠加式液控单向阀
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工程机械行走制动系统必须保证在恶劣条件下仍具有良好的制动性能,并要求操纵轻便和高可靠性。目前大多数工程机械的制动系统采用气顶油的
结构型式,以实现车辆的高压制动效能。近年来,国外工程机械出现采用全液压制动的方式,其主要.优点是系统的制动压力高,产生的制动力矩大,制动灵敏,且液压管路为全封闭的回路,污染性也很小。
液压制动系统一般由制动传动装置和制动执行元件两部分组成。前者将制动踏板控制的动力源传递给制动执行元件;后者是装在车轮上的制动器,它将传动装置传来的动力变成摩擦力矩。