电磁干粉磁选机磁场强度下降查什么?


发布时间:

2025-03-03

电磁干粉磁选机运行一两年后,不少客户发现除铁效果大不如前,用高斯计一测,分选区磁场强度比初始值低了20%以上。磁场强度下降,根源通常出在励磁线圈和磁路两个环节。

电磁干粉磁选机运行一两年后,不少客户发现除铁效果大不如前,用高斯计一测,分选区磁场强度比初始值低了20%以上。磁场强度下降,根源通常出在励磁线圈和磁路两个环节。

山鲁电磁干粉磁选机设备.jpg

励磁线圈老化或匝间短路是磁场下降的首要原因。 线圈长期在高温下工作,绝缘层逐渐老化,匝间出现轻微短路后有效匝数减少,磁场强度随之下降。检查方法很简单:断开电源,用万用表测量线圈直流电阻,与说明书标准值对比,偏差超过10%说明线圈已老化或短路,需更换。若电阻正常但磁场仍偏低,检查励磁电源的输出电流是否达到额定值,整流元件损坏也会导致电流不足。

磁轭生锈或磁介质磨损同样会削弱磁场。 磁轭是磁力线的通路,生锈后磁导率下降,磁力线在传递过程中损失增大。拆开磁系外壳检查磁轭表面有无锈蚀,轻微锈蚀用砂纸打磨后涂防锈漆,锈蚀严重的需更换磁轭。磁介质(钢网或钢棒)磨损变细后,磁场梯度降低,吸附能力下降,建议每两年更换一次磁介质。

冷却不良导致线圈温度过高,磁场也会衰减。 线圈温度超过80℃时,磁场强度明显下降。检查冷却水路是否畅通、水温是否正常,清理水路内的水垢和杂质。日常运行中注意观察温控仪表,温度偏高时立即降载或停机散热。

磁场强度下降是渐进过程,等到除铁效果明显变差时往往已下降不少。建议每季度用高斯计检测一次分选区磁场强度,做好记录,发现持续下降及时排查。设备运行相关问题,欢迎致电山鲁重工:张经理 13583776655(同微信)。


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