油研YUKEN電磁換向閥推桿伸出長度過長,與電磁鐵的行程配合不當,電磁鐵銜鐵不能吸合,使電流過大,線圈過熱。當電磁鐵因其他原因燒毀后,使用者自行更換電磁鐵時更容易出現(xiàn)這種情況。由于電磁鐵的銜鐵與鐵芯的吸合面到與閥體安裝表面的距離誤差較大,與原來電磁鐵相配合的推桿的伸出長度就不一定能完全適合更換后的電磁鐵。油研YUKEN電磁換向閥如更換后的電磁鐵的安裝距離比原來的短,則與閥裝配后,由于推桿過長,將有可能使銜鐵不能吸合,而產(chǎn)生噪聲、抖動甚至燒毀。
油研YUKEN電磁換向閥和油浸式電磁鐵不同處是推桿處無密封圈。線圈和銜鐵都浸在有壓油液中,故散熱好,摩擦小。還因油液的阻尼作用而減小了切換時的沖擊和噪聲。所以濕式電磁鐵具有吸著聲小、壽命長、溫升低等優(yōu)點。如果電磁換向閥的各項性能指標都合格,而在使用中出現(xiàn)上述故障,主要檢查使用條件是否超過規(guī)定的指標。如工作的壓力,通過的流量,油溫以及油液的過濾精度等。再檢查復位彈簧是否折斷或卡住。對于板式連接的電磁換向閥,油研YUKEN電磁換向閥應檢查安裝底板表面的不平度,以及安裝螺釘是否擰得太緊,以至引起閥體變形。另外,閥芯磨削加工時的毛刺、飛邊,被擠入徑向平衡槽中未清干凈,在長期工作中,被油流沖出擠入徑向間隙中使閥芯卡住,這時應拆開仔細清洗。
DSHG-04-3C4-A220油研YUKEN電磁閥出售現(xiàn)貨
油研YUKEN電磁換向閥的基本工作原理是相同的,通過電磁鐵控制滑閥閥芯的不同位置,以改變形油液的流動方向。當電磁鐵斷電時,滑閥由彈簧保持在中間位置或初始位置(脈沖式閥除外)。若推動故障檢查按鈕可使滑閥閥芯移動。電磁鐵吸合,并推動閥芯向右移動,使P和B連通,A和T連通。當其斷電后,右端復位彈簧的作用力可使閥芯回到中間位置,恢復原來四個油腔相互封閉的狀態(tài);當右端電磁鐵通電時,其銜鐵將通過推桿推動閥芯向左移動,P和A相通、B和T相通。油研YUKEN電磁換向閥電磁鐵斷電,閥芯則在左彈簧的作用下回到中間位置。鐵芯與扼鐵處于空氣中不和油接觸,電磁鐵與閥聯(lián)結(jié)時,在推桿的外周有密封圈。由于回油有可能滲入對中彈簧腔中,所以閥的回油壓力不能太高。此類電磁鐵附有手動推桿,一旦電磁鐵發(fā)生故障時可使閥芯手動換位。此類電磁鐵是簡單液壓系統(tǒng)常用的一種形式。
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DSHG-04-3C4-A220油研YUKEN電磁閥出售現(xiàn)貨
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