力士乐压力切断阀DA6VP2A50/200FSM

力士乐压力切断阀DA6VP2A50/200FSM R901224233，德国REXROTH压力切断阀，购买进口液压、气动、自动化控制工业配件，认准“上海韦米机电设备有限公司”，7年老店，产品实拍，保证产品原厂原装，价格优惠，售后无忧，欢迎新老客户咨询采购！
 

液压传动技术已经广泛应用于很多工程技术领域,由于液压系统所服务的主机的工作循环、动作特点等各不相同,相应的各液压系统的组成、作用和特点也不尽相同。以下通过对几个典型液压系统的分析,进一步熟悉各液压元件在系统中的作用和各种基本回路的组成,并掌握分析液压系统的方法和步骤。
阅读一个较为复杂的液压系统图,大致可按以下步骤进行:
(1)了解设备的工艺对液压系统的动作要求;
(2)初步游览整个系统, 了解系统中包含有哪些元件,并以各个执行元件为中心,将系统分解为若干子系统。
(3)对每一子系统进行分析,搞清楚其中含有哪些基本回路,然后根据执行元件的动作要求,参照动作循环表读懂这一子系统。
(4)根据液压设备中各执行元件间互锁、同步、防干涉等要求,分析各子系统之间的联系。
(5)在全面读懂系统的基础上,归纳总结整个系统有哪些特点,以加深对系统的理解。

一,组合机床液压系统
组合机床液压系统主要由通用滑台和辅助部分(如定位、夹紧)组成。动力滑台本身不带传动装置,可根据加工需要安装不同用途的主轴箱,以完成钻、扩、铰、镗、刮端面、铣削及攻丝等工序。
有液压夹紧的他驱式动力滑台的液压系统原理图，这个系统采用限压式变量泵供油，并配有二位二通电磁阀卸荷，变量泵与进油路的调速阀组成容积节流调速回路，用电液换向阀控制液压系统的主油路换向，用行程阀实现快和工进的速度换接。

二,液压系统的特点
液压系统采用限压式变量泵和调速阀组成容积节流调速系统,把调速阀装在进油路上,而在回油路上加背压阀。这样就获得了较好的低速稳定性、较大的调速范围和较高的效率。而且当滑台需死挡铁停留时,用压力继电器发出信号实现快退比较方便。
采用限压式变量泵并在快进时采用差动连接, 不仅使快进速度和快退速度相同差动缸),而且比不采用差动连接的流量可诚小一倍,其能量得到合理利用,系统效率进一步得到提高。
采用电液换向阀使换向时间可调,改善和提高了换向性能。采用行程阀和液控顺序阀来实现快进与工进的转换,比采用电磁阀的电路简化,而且使速度转换动作可靠,转换精度也较高。此外,用两个调速阀串联来实现两次工进, 使转换速度平稳而无沖击。
夹紧油路中串接诚压阀,不仅可使其压力低于主油路压力,而且可根据工件夹紧力的需要来调节并稳定其压力;当主系统快速运动时,即使主油路压力低于减压阀所调压力,因为有单向阀的存在,夹紧系统也能维持其压力(保压)。夹紧油路中采用二位四通阀,它的常态位置是夹紧工件,这样即使在加工过程中临时停电,也不至于使工件松开,保证了操作安全可靠。
力士乐压力切断阀DA6VP2A50/200FSM R901224233
力士乐REXROTH高压截止阀
力士乐REXROTH高压截止阀，先导式
力士乐REXROTH压力切断阀，先导操作，机械操作KAV
R901220879 KAV2C2AA/AM
R901058924 KAV2C2AA/AV
R901220878 KAV2F2AA/AM
R901058926 KAV2F2AA/AV
R901354128 KAV2K2AA/A-130-110V
R901353452 KAV2K2AA/A-160-140V
R901220877 KAV2K2AA/AM
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R901231664 KAV2K2AA/AV-028
R901220869 KAV2R2AA/AM
R901058934 KAV2R2AA/AV
R901231663 KAV2R2AA/AV-028
力士乐REXROTH先导式压力切断阀DA 6 V
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力士乐REXROTH先导式压力切断阀DA
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R900596611 DAC30-1-5X/315-17
R900509557 DAC30-1-5X/315-17Y
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R900597120 DAC30-2-5X/200-10Y
R900558848 DAC30-2-5X/200-10Y=LB
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R900513800 DAC30-2-5X/315-10
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R901264745 DAC1-5X/100-10
R900597813 DAC1-5X/100-17Y
力士乐REXROTH先导式压力切断阀DAW
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R900512239 DAW20A1-5X/315-17-6AG24NZ4
R900539867 DAW20A1-5X/315-17-6AW220-50NZ4
R900505327 DAW20A1-5X/315-17Y6AW120-60NZ45/12
R900515868 DAW20A1-5X/315-17Y6BG24NEX
R901047658 DAW20A1-5X/315-17Y6EG24N9K4
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R900596570 DAW20A2-5X/315-17-6AG24NZ5L
DA/DAW型先导控制式卸荷阀:
1.工作原理
DA/DAW型阀是先导控制式卸荷阀，它的作用是给蓄能补油，采用高低压双泵的液压系统中，可使低压泵卸荷。
该阀主要是由先导阀、带主阀芯的主阀和单向阀组成。通径10的单向阀在主阀体内，而通径25和32单向阀是在主阀底下的连接板内。
DA型阀
从P→A切换到P→T
泵输出的液流从单向阀流到阀腔(P→A)，同时通过通道流到活塞;通过阻尼器流到主阀的上腔，并且经过阻尼器作用在锥阀上。一但系统压力达到先导阀调定的卸荷压力时，立即把锥阀打开。当控制油经过阻尼器和通过Y排到T腔时，由于阻尼器和在主阀上产生了一个压力降。这时主阀打开，压力油从P腔流到T腔(P→T)。
当主阀开启并且打开时(P→T)，由于A腔的压力作用在柱塞(4)和单向
阀上，使得锥阀(8) 打开和单向阀关闭。这样就完成了从P→A切换到P→T。
从P→T切换到P→A
由于柱塞(4) 的面积比锥阀(8)的有效面积大17%，所以活塞上的作用力也比锥阀上的作用力大17%。
如果蓄能器的压力低于它相对应的切换压力差时，弹簧(9)将锥阀(8)关闭。这样主阀(6)上腔建立起压力，使主阀芯(6)关闭，即关闭了P→T。这样泵输出的液流重新又经过单向阀进入到液压系统。.
DAW型阀
这种阀的性能与DA型阀相同，只是在先导阀(2). 上有个电磁阀，可在先导阀调定的切换压力下任意实现从A→T或T→A。
2.DA/DAW型先导控制式牌子荷阀常见故障及排除
(一)卸荷阀不卸荷
由于阻尼器堵塞，阀芯上腔油液无排出故在导阀开启的情况下，主阀上下腔压力相等且上端面积大于下端面积，无法开启，P→T无油卸荷;主阀在关闭位置时卡住同样不能卸荷;柱塞卡住无法打开导阀则同样不能卸荷。
(二)非卸荷状态下卸荷
由于阻尼器(5)堵塞阀芯上腔未有油压作用，而主阀弹簧力很弱，故主阀芯在很小的力作用开启而卸荷;主阀在开启位置时卡住同样卸荷，而控力并未达导阀的调定值。导阀活塞卡住，导阀常开，则亦卸荷。
(三)DAW型的电磁阀故障同样造成上述二种故障发生。
(四)各“O”形密封圈损坏而引起各部位外泄漏。

五、压力继电器的常见故障及排除
压力继电器的常见故障是灵敏度降低和微动开关损坏等。
前者是由于阀芯、推杆的径向卡紧，或微动开关空行程过大等引起。当阀芯或推杆发生径向卡紧时，磨擦力增加，这个阻力与阀芯和推杆的运动方向相反，它一个方向帮助油液压力克服弹簧力，使油液压力降低，因而使压力继电器的灵敏度降低。
在使用中，由于微动开关支架变形，或零位可调部分松动，都会使原来调整好或在装配后保证的微动开关*小空行程变大，使灵敏度降低。
压力继电器的泄漏如不直接接回油箱，由于泄油口背压过高，也会使灵敏度降低。
差动式压力继电器，因微动开关部分和泄油腔反时，压力即冲破橡胶隔膜进入微动开关部分，从而损坏微动开关。另外，由于调压弹簧腔和泄油腔相通，调节螺钉处又无密封装置，当泄油压力过高时，在调节螺钉处会出现外泄漏现象。所以泄油腔必须直接接回油箱。
压力继电器是一种将油液的压力信号转换成电信号的小型电液控制元件。当油液压力达到压力继电器的调定压力时，即发出电信号，以控制电磁铁、电磁离合器、继电器等电气元件动作，使油路卸荷、卸压、换向、执行机构实现顺序动;作，或关闭电动机，使系统停止工作，起到安全保护作用等。

六、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。如图15、图16所示。
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。