油研YUKEN電磁換向閥推桿伸出長(zhǎng)度過(guò)長(zhǎng),與電磁鐵的行程配合不當(dāng),電磁鐵銜鐵不能吸合,使電流過(guò)大,線圈過(guò)熱。當(dāng)電磁鐵因其他原因燒毀后,使用者自行更換電磁鐵時(shí)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(lái)電磁鐵相配合的推桿的伸出長(zhǎng)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(lái)的短,則與閥裝配后,由于推桿過(guò)長(zhǎng),將有可能使銜鐵不能吸合,而產(chǎn)生噪聲、抖動(dòng)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(wú)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(shí)的沖擊和噪聲。所以濕式電磁鐵具有吸著聲小、壽命長(zhǎng)、溫升低等優(yōu)點(diǎn)。如果電磁換向閥的各項(xiàng)性能指標(biāo)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(guò)規(guī)定的指標(biāo)。如工作的壓力,通過(guò)的流量,油溫以及油液的過(guò)濾精度等。再檢查復(fù)位彈簧是否折斷或卡住。對(duì)于板式連接的電磁換向閥,油研YUKEN電磁換向閥應(yīng)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(shí)的毛刺、飛邊,被擠入徑向平衡槽中未清干凈,在長(zhǎng)期工作中,被油流沖出擠入徑向間隙中使閥芯卡住,這時(shí)應(yīng)拆開(kāi)仔細(xì)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(guò)電磁鐵控制滑閥閥芯的不同位置,以改變形油液的流動(dòng)方向。當(dāng)電磁鐵斷電時(shí),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(dòng)故障檢查按鈕可使滑閥閥芯移動(dòng)。電磁鐵吸合,并推動(dòng)閥芯向右移動(dòng),使P和B連通,A和T連通。當(dāng)其斷電后,右端復(fù)位彈簧的作用力可使閥芯回到中間位置,恢復(fù)原來(lái)四個(gè)油腔相互封閉的狀態(tài);當(dāng)右端電磁鐵通電時(shí),其銜鐵將通過(guò)推桿推動(dòng)閥芯向左移動(dòng),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(shí),在推桿的外周有密封圈。由于回油有可能滲入對(duì)中彈簧腔中,所以閥的回油壓力不能太高。此類(lèi)電磁鐵附有手動(dòng)推桿,一旦電磁鐵發(fā)生故障時(shí)可使閥芯手動(dòng)換位。此類(lèi)電磁鐵是簡(jiǎn)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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