4WE6GA6X/EG24N9K4 REXROTH电磁阀

4WE6GA6X/EG24N9K4 REXROTH电磁阀 德国博世力士乐REXROTH电磁阀 电磁方向阀

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4WE6GA6X/EG24N9K4 REXROTH电磁阀

方向控制阀

类型:单向阀、换向阀

一、单向阀

类型:普通单向阀、液控单向阀

1、普通单向阀

作用:只允许油液沿一个方向流动，不允许油液反向倒流(起止回作用)

对单向阀的性能要求:

(1) 正向导通时，压力损失要小;

(2)反向截止时，密封性要好。

2、

液控单向阀

作用:

(1)起止回作用;

(2)必要时解除逆止，允许油液反向通过。

3、单向阀用途

(1)止回作用:安装在泵的出口，p.=0.3~0.5 bar

(2)作背压阀用:防止液压缸前冲或爬行，使系统作平稳。

(3)作锁紧装置用:起重机支腿、夹紧回路等。

(4)保持控制油路有必要的压力: Pr≥P液挖

(5)作复合阀使用:单向节流阀、单向顺序阀、单向减压阀、单向调速阀等。

(6)局部回路作安全阀使用: Ppr>P换热器正常工作的距力

二、换向阀

作用:

利用阀芯相对于阀体间的相对位置改变，使油路接通、关断，或改变油流的方向，从而使液压执行元件启动、停止或变换运动方向。

1、对换向阀的性能要求

(1)油液导通时压力损失要小;

(2)油液断开时泄漏要小;

(3)阀芯换位时操纵力要小。

2、类型

按阀芯的形状分类滑阀、转阀

按阀的安装方式分类:管式、板式、法兰式。

按操纵方式分类: 

手动、机动、电动、弹簧控制、液动、液压先导控制、电液动等。

电磁阀是由电磁线圈和磁芯组成，是包含一个或几个孔的阀体。当线圈通电或断电时，磁芯的运转将导致流体通过阀体或被切断，以达到改变流体方向的目的。电磁阀的电磁部件由固定铁芯、动铁芯、线圈等部件组成；阀体部分由滑阀芯、滑阀套、弹簧底座等组成。电磁线圈被直接安装在阀体上，阀体被封闭在密封管中，构成一个简洁、紧凑的组合。

电磁阀的故障应从以下几方面排查：

1、电磁阀接线头松动或线头脱落，电磁阀不得电，可紧固线头。

2、电磁阀线圈烧坏，可拆下电磁阀的接线，用万用表测量，如果开路，则电磁阀线圈烧坏。原因有线圈受潮，引起绝缘不好而漏磁，造成线圈内电流过大而烧毁，因此要防止雨水进入电磁阀。此外，弹簧过硬，反作用力过大，线圈匝数太少，吸力不够也可使得线圈烧毁。紧急处理时，可将线圈上的手动按钮由正常工作时的“0”位打到“1”位，使得阀打开。

3、电磁阀卡住：电磁阀的滑阀套与阀芯的配合间隙很小（小于0.008mm），一般都是单件装配，当农业生产体系械杂质带入或润滑油太少时，很容易卡住。处理方法可用钢丝从头部小孔捅入，使其弹回。根本的解决方法是要将电磁阀拆下，取出阀芯及阀芯套，用CCI4清洗，使得阀芯在阀套内动作灵活。拆卸时应注意各部件的装配顺序及外部接线位置，以便重新装配及接线正确，还要检查油雾器喷油孔是否堵塞，润滑油是否足够。

4、漏气：漏气会造成空气压力不足，使得强制阀的启闭困难，原因是密封垫片损坏或滑阀磨损而造成几个空腔窜气。在处理切换系统的电磁阀故障时，应选择适当的时机，等该电磁阀处于失电时进行处理，若在一个切换间隙内处理不完，可将切换系统暂停，从容处理。

电磁阀型号

WE型电磁换向阀采用湿式交流或直流电磁铁。该阀是通过电磁铁控制阀芯的不同工作位置。当电磁铁断电时，阀芯靠弹簧压力保持在中间或终端位置(脉冲式阀除外)。电磁铁通电，阀芯被推到工作位置上，断电后又恢复到初始状态。这时用手推动故障检查按钮可使阀芯移动。

由于湿式电磁铁内部与回油腔相通，这样衔铁油里移动，可以减少磨损、缓冲，并且提高了散热性能，提高了使用寿命。交流电磁铁具有动作时间短，电气控制线路简单，不需特殊的触头保护等特点。直流电磁铁是切换特性软，动作频率高，对过载或低电压反应不敏感，工作可靠。

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