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適用設備類型

液控換向的泵送設備

故障現象

小型(xing)泵車S管故障，S管出現亂擺(bai)的現象：

1.當(dang)油(you)溫(wen)在65-72度(du)之間時S出現(xian)亂擺；

2.泵(beng)車(che)在(zai)正(zheng)(zheng)常工作時(shi)S管偶爾出(chu)現(xian)亂(luan)擺，即有(you)時(shi)正(zheng)(zheng)常有(you)時(shi)亂(luan)擺；3.S管出(chu)現(xian)亂(luan)擺，來回擺動兩到(dao)三(san)次并停在(zai)中(zhong)間(jian)部位不動。若中(zhong)途停泵(beng)再次開啟(qi)泵(beng)送，S管出(chu)現(xian)亂(luan)擺兩到(dao)三(san)次，然后停在(zai)中(zhong)間(jian)部位。

系統分析

根據現(xian)象對系統進行簡要分析(xi)：

分(fen)(fen)配系(xi)統(tong)由(you)恒壓(ya)泵（1）、擺(bai)(bai)動(dong)(dong)(dong)(dong)油缸(gang)（8）、控(kong)制(zhi)部(bu)分(fen)(fen)（7）、其(qi)余附(fu)件組成。壓(ya)泵給系(xi)統(tong)提供(gong)壓(ya)力油，推動(dong)(dong)(dong)(dong)擺(bai)(bai)動(dong)(dong)(dong)(dong)油缸(gang)動(dong)(dong)(dong)(dong)作(zuo)，中(zhong)(zhong)間(jian)的控(kong)制(zhi)閥組控(kong)制(zhi)擺(bai)(bai)動(dong)(dong)(dong)(dong)油缸(gang)的動(dong)(dong)(dong)(dong)作(zuo)順(shun)序(xu)。“S管亂(luan)擺(bai)(bai)”可理解為擺(bai)(bai)動(dong)(dong)(dong)(dong)油缸(gang)的擺(bai)(bai)動(dong)(dong)(dong)(dong)正常，只(zhi)是動(dong)(dong)(dong)(dong)作(zuo)邏輯混亂(luan)，初(chu)步判斷故障(zhang)出(chu)在中(zhong)(zhong)間(jian)的控(kong)制(zhi)部(bu)分(fen)(fen)（7）。中(zhong)(zhong)間(jian)控(kong)制(zhi)部(bu)分(fen)(fen)由(you)電(dian)(dian)磁(ci)換(huan)向(xiang)閥（7.1）、小液(ye)(ye)動(dong)(dong)(dong)(dong)換(huan)向(xiang)閥（7.2）、大(da)液(ye)(ye)動(dong)(dong)(dong)(dong)換(huan)向(xiang)閥（7.3）組成，三(san)個閥的動(dong)(dong)(dong)(dong)作(zuo)都(dou)能引起擺(bai)(bai)缸(gang)換(huan)向(xiang)，其(qi)中(zhong)(zhong)大(da)液(ye)(ye)動(dong)(dong)(dong)(dong)閥的工作(zuo)油路(lu)(lu)接擺(bai)(bai)缸(gang)，電(dian)(dian)磁(ci)閥和小液(ye)(ye)動(dong)(dong)(dong)(dong)閥的工作(zuo)油路(lu)(lu)控(kong)制(zhi)大(da)液(ye)(ye)動(dong)(dong)(dong)(dong)閥換(huan)向(xiang)，電(dian)(dian)磁(ci)閥由(you)左(zuo)右(you)兩個電(dian)(dian)磁(ci)鐵和復(fu)位彈簧控(kong)制(zhi)，小液(ye)(ye)動(dong)(dong)(dong)(dong)閥動(dong)(dong)(dong)(dong)作(zuo)由(you)主(zhu)油缸(gang)邏輯閥（9）過來的液(ye)(ye)控(kong)信號控(kong)制(zhi)，小液(ye)(ye)動(dong)(dong)(dong)(dong)閥的泄油在合流后接回油箱(xiang)。

故障排除

針對以上三種狀況的(de)出現，可以直接(jie)按照以下方(fang)法處理:

A、當油(you)(you)溫(wen)(wen)(wen)在(zai)65-72度(du)時出現亂擺，說(shuo)明換向(xiang)信號與油(you)(you)溫(wen)(wen)(wen)有關，油(you)(you)溫(wen)(wen)(wen)表示油(you)(you)液的粘(zhan)度(du)，溫(wen)(wen)(wen)度(du)越高粘(zhan)度(du)越小，粘(zhan)度(du)低后液壓(ya)系統內(nei)部的泄(xie)(xie)露量(liang)會增大。在(zai)這(zhe)種狀況中，泄(xie)(xie)露大造(zao)成了小液動(dong)閥收到誤信號，一般是邏輯閥問題，更換邏輯閥故障(zhang)即可排(pai)除。

B、S管出現(xian)(xian)亂擺時好時壞(huai)的現(xian)(xian)象(xiang)，一般是(shi)S管二(er)位液動換(huan)向(xiang)閥(fa)閥(fa)芯出現(xian)(xian)磨損，使(shi)得閥(fa)芯不(bu)能定位，將(jiang)二(er)位液動換(huan)向(xiang)閥(fa)更換(huan)故障即(ji)可(ke)排除。