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                                                                                                                                                                如何分析壓路機振動故障?
                                                                                                                                                                發布時間:2013-2-25 10:27:15

                                                                                                                                                                為及時進行壓路機故障診斷,在壓路機液壓系統的關鍵部位都設置了測壓口。用戶利用壓路機上配備的振動測量儀,能方便迅速地查找故障,減少排障維修時間。

                                                                                                                                                                  若柴油機額定轉速正常,可將壓路機前后各行駛10m,使振動軸承箱的油封得到充分潤滑。然后將振動輪停置在舊橡膠輪胎上,掛上空擋,啟動柴油機,以最大的速度運轉,將手掌托住彈簧式頻率表,放在前機架上,在極短時間內開啟振動,看測得振動頻率是否為31Hz(此時偏心軸轉速相應為1860r/min)。
                                                                                                                                                                 

                                                                                                                                                                  若測得振動頻率低,則應檢查振動馬達的漏油率。運轉壓路機,達到工作油溫500C。將振動輪停置在舊橡膠管口。測量用的軟管連到馬達泄油口,另一端放在計量桶里。以最大轉速開動柴油機,開啟振動。漏油量應不超過2.5L/min。若超出此值,應檢修馬達。
                                                                                                                                                                 

                                                                                                                                                                  如果馬達漏油率在允許范圍內,則應檢查振動回路壓力。運轉壓路機,使達到工作油溫(液壓油溫度500C),將振動輪停置在舊輪胎上,驅動輪用三角塊墊住。用測試軟管將60MPa的壓力表接到振動系統測試口上,以最大轉速開動柴油機,開啟振動,觀察壓力表,啟動壓力(馬達在剛開始啟動時壓力表讀數)應為19~21MPa,工作壓力(振動馬達在平穩運轉時的讀數)應為8~11MPa 。若啟動壓力低,應查振動泵,若工作壓力顯著高于11MPa,則應查振動軸承。
                                                                                                                                                                 

                                                                                                                                                                  工作壓力明顯高于11MPa時,應拆下振動馬達,檢查振動軸承的軸向間隙。將振動軸沿軸向推檢,應有1~2mm的軸向竄動量;再檢查振動軸承的徑向間隙,用撬棒向偏心軸施加徑向力,若能明顯感覺有竄動量,則須換軸承;最后查振動軸自由運動狀況,給振動軸軸端螺孔裝上一個六角頭螺栓,用套筒板手順時針方向轉動螺栓1900C,然后松開板手。若振動在幾次自由擺動時,感覺有明顯的阻力,則要換軸承。
                                                                                                                                                                 

                                                                                                                                                                  若振動回路中起動壓力低,則應拆去振動泵上的高壓軟管,用塞頭封住油管接口,將60MPa壓力表接在振動泵高壓口上,柴油機油門桿放置到停熄位置。用起動馬達轉動柴油機,若壓力達不到10MPa則更換泵,若壓力達到10MPa,則檢查起動控制閥。
                                                                                                                                                                 

                                                                                                                                                                  檢查起動控制閥時,應松開電線接頭螺絲。如果接通振動開關,插座的接觸點上無電,則尋找電路系統故障和電瓶電壓是否充足。取出座套,松開電磁線圈上的螺母,連同電線和插座一并取下,在插座上接12V直流電,用螺絲刀試探一下磁場是否建立起來了,若無磁場,應換線圈;有磁場,則換振動閥。

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