4WE6GA6X/EG24N9K4 REXROTH電磁閥

4WE6GA6X/EG24N9K4 REXROTH電磁閥 德國博世力士樂REXROTH電磁閥 電磁方向閥

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4WE6GA6X/EG24N9K4 REXROTH電磁閥

方向控制閥

類型:單向閥、換向閥

一、單向閥

類型:普通單向閥、液控單向閥

1、普通單向閥

作用:只允許油液沿一個方向流動，不允許油液反向倒流(起止回作用)

對單向閥的性能要求:

(1) 正向?qū)�通時，壓力損失要小;

(2)反向截止時，密封性要好。

2、

液控單向閥

作用:

(1)起止回作用;

(2)必要時解除逆止，允許油液反向通過。

3、單向閥用途

(1)止回作用:安裝在泵的出口，p.=0.3~0.5 bar

(2)作背壓閥用:防止液壓缸前沖或爬行，使系統(tǒng)作平穩(wěn)。

(3)作鎖緊裝置用:起重機支腿、夾緊回路等。

(4)保持控制油路有必要的壓力: Pr≥P液挖

(5)作復合閥使用:單向節(jié)流閥、單向順序閥、單向減壓閥、單向調(diào)速閥等。

(6)局部回路作安全閥使用: Ppr>P換熱器正常工作的距力

二、換向閥

作用:

利用閥芯相對于閥體間的相對位置改變，使油路接通、關(guān)斷，或改變油流的方向，從而使液壓執(zhí)行元件啟動、停止或變換運動方向。

1、對換向閥的性能要求

(1)油液導通時壓力損失要小;

(2)油液斷開時泄漏要小;

(3)閥芯換位時操縱力要小。

2、類型

按閥芯的形狀分類滑閥、轉(zhuǎn)閥

按閥的安裝方式分類:管式、板式、法蘭式。

按操縱方式分類: 

手動、機動、電動、彈簧控制、液動、液壓先導控制、電液動等。

電磁閥是由電磁線圈和磁芯組成，是包含一個或幾個孔的閥體。當線圈通電或斷電時，磁芯的運轉(zhuǎn)將導致流體通過閥體或被切斷，以達到改變流體方向的目的。電磁閥的電磁部件由固定鐵芯、動鐵芯、線圈等部件組成；閥體部分由滑閥芯、滑閥套、彈簧底座等組成。電磁線圈被直接安裝在閥體上，閥體被封閉在密封管中，構(gòu)成一個簡潔、緊湊的組合。

電磁閥的故障應從以下幾方面排查：

1、電磁閥接線頭松動或線頭脫落，電磁閥不得電，可緊固線頭。

2、電磁閥線圈燒壞，可拆下電磁閥的接線，用萬用表測量，如果開路，則電磁閥線圈燒壞。原因有線圈受潮，引起絕緣不好而漏磁，造成線圈內(nèi)電流過大而燒毀，因此要防止雨水進入電磁閥。此外，彈簧過硬，反作用力過大，線圈匝數(shù)太少，吸力不夠也可使得線圈燒毀。緊急處理時，可將線圈上的手動按鈕由正常工作時的“0”位打到“1”位，使得閥打開。

3、電磁閥卡�。弘姶砰y的滑閥套與閥芯的配合間隙很�。ㄐ∮�0.008mm），一般都是單件裝配，當農(nóng)業(yè)生產(chǎn)體系械雜質(zhì)帶入或潤滑油太少時，很容易卡住。處理方法可用鋼絲從頭部小孔捅入，使其彈回。根本的解決方法是要將電磁閥拆下，取出閥芯及閥芯套，用CCI4清洗，使得閥芯在閥套內(nèi)動作靈活。拆卸時應注意各部件的裝配順序及外部接線位置，以便重新裝配及接線正確，還要檢查油霧器噴油孔是否堵塞，潤滑油是否足夠。

4、漏氣：漏氣會造成空氣壓力不足，使得強制閥的啟閉困難，原因是密封墊片損壞或滑閥磨損而造成幾個空腔竄氣。在處理切換系統(tǒng)的電磁閥故障時，應選擇適當?shù)臅r機，等該電磁閥處于失電時進行處理，若在一個切換間隙內(nèi)處理不完，可將切換系統(tǒng)暫停，從容處理。

電磁閥型號

WE型電磁換向閥采用濕式交流或直流電磁鐵。該閥是通過電磁鐵控制閥芯的不同工作位置。當電磁鐵斷電時，閥芯靠彈簧壓力保持在中間或終端位置(脈沖式閥除外)。電磁鐵通電，閥芯被推到工作位置上，斷電后又恢復到初始狀態(tài)。這時用手推動故障檢查按鈕可使閥芯移動。

由于濕式電磁鐵內(nèi)部與回油腔相通，這樣銜鐵油里移動，可以減少磨損、緩沖，并且提高了散熱性能，提高了使用壽命。交流電磁鐵具有動作時間短，電氣控制線路簡單，不需特殊的觸頭保護等特點。直流電磁鐵是切換特性軟，動作頻率高，對過載或低電壓反應不敏感，工作可靠。

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