MBP-02B/HEWEIYY疊加式液壓閥 MBA MBB 溢流閥 03 B/C/H
分析液壓換向閥卡死的原因
簡介:
電磁換向閥在液壓系統(tǒng)中運用非常廣泛,在工作過程中,電磁換向閥有時會出現(xiàn)閥芯卡死現(xiàn)象,通過分析閥芯的卡死多數(shù)情況下是由于液壓油污物造成的。而下面著重分析新的液壓系統(tǒng)在剛剛安裝完畢進行調(diào)試時,出現(xiàn)的電磁換向閥閥芯卡死現(xiàn)象的原因。多年的實踐表明,安裝調(diào)試時出現(xiàn)閥芯卡死的電磁換向閥往往是小通徑(≠6以下)闆式電磁換向閥,而疊加閥更容易出現(xiàn)閥芯卡死現(xiàn)象。這些閥安裝在液壓系統(tǒng)中之前,其閥芯運動自如,而當用螺釘與閥闆或集成塊連接固定后就出現(xiàn)閥芯卡死現(xiàn)象。針對這一現(xiàn)象作如下分析。
小通徑闆式電磁換向閥出現(xiàn)閥芯卡死的原因:
圖4(a)爲小通徑闆式電磁換向閥與閥闆(塊)用螺釘把緊在一起的示意圖。閥闆(塊)在加工時,一般均能按設(shè)計要求使其平面度達到足夠的精度,因此出現(xiàn)當用螺釘緊固后閥芯卡死時,其原因如圖4(b)、(c)所示。即當電磁換向閥底面凹進去[見圖4(c)],此時小通徑電磁換向閥由于閥體比較單薄,當用螺釘與閥闆(塊)緊固后,使閥體變形,從而造成閥芯卡死在閥腔中。
電磁換向閥、疊加閥
疊加式電磁換向閥出現(xiàn)閥芯卡死的原因:
如圖5所示,當電磁換向閥與閥闆(塊)之間夾有疊加節(jié)流閥時,更容易出現(xiàn)電磁換向閥閥芯卡死現(xiàn)象。這是由于電磁換向閥底面、疊加節(jié)流閥上下聯(lián)結(jié)面在加-中都可能出現(xiàn)加工精度不高,疊加在一起累積誤差增大,用螺釘緊固后造成電磁換向閥閥體變形而使閥芯卡死。
在多年的實踐中發(fā)現(xiàn),小通徑闆式電磁換向閥與閥闆(塊)用螺釘把緊后出現(xiàn)閥芯卡死的現(xiàn)象有時會遇到,而中間夾一疊加節(jié)流閥時,電磁閥閥芯卡死現(xiàn)象會經(jīng)常出現(xiàn)。這是由于疊加節(jié)流閥悶體大多是鑄鐵的,上下聯(lián)結(jié)面加工時,鑄鐵閥體尚未達到足夠的失效時間,機加工完畢的疊加閥,經(jīng)一定時間后上下聯(lián)結(jié)面産生變形,使其平面度大大降低。
解決辦法:
在液壓系統(tǒng)安裝調(diào)試時,由于找出了閥芯卡死的原因,因此解決起來就不難了。隻需把電磁換向閥底面或疊加節(jié)流閥上下表面重新加工一次,使之平面度達到足夠的精度,問題就迎刃而解了。
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