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源，从而对气动控制膜头气路进行切换。德国Rexroth电磁阀，REXROTH电磁阀，德国力士乐电磁阀它由阀体、阀罩、电磁组件、弹簧及密封结构等部件组成，动铁芯底部的密封块借助弹簧的压力将阀体进气口关闭。通电后，电磁铁吸合，动铁芯上部带弹簧的密封块把排气口关闭，气流从进气口进入膜头，起到控制作用。当失电时，电磁力消失，动铁芯在弹簧力作用下离开固定铁芯，向下移动，将排气口打开，堵住进气口，膜头气流经排气口排出，膜片恢复原来位置。在我们的制氧设备中，在透平膨胀机进口薄膜调节阀的紧急切断等处有应用。四通电磁阀在我们的生产中应用也很多，其工作原理如下：当有电流通过线圈时，产生励磁作用，固定铁芯吸合动铁芯，动铁芯带动滑阀芯并压缩弹簧，改变了滑阀芯的位置，从而改变了流体的方向。当线圈失电时，依靠弹簧的弹力推动滑阀芯，顶回动铁芯，使流体按原来的方向流动。在我们制氧生产中，分子筛切换系统强制阀的开关就是通过二位四通电磁阀来控制的，气流分别供至强制阀的活塞两端。从而来控制强制阀的启闭。电磁阀的故障将直接影响到切换阀和调节阀的动作，常见的故障有电磁阀不动作，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，当有机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。德国Rexroth电磁阀，REXROTH电磁阀，德国力士乐电磁阀