干式辊式磁选机磁辊表面温度过高怎么办?


发布时间:

2026-10-21

永磁干式辊式磁选机在石英砂干法除铁中,磁辊表面温度过高是容易被忽视的问题。磁辊温度一高,钕铁硼磁材的磁力逐渐衰减,除铁效果悄悄下降,而且这种衰减往往不可逆。问题

永磁干式辊式磁选机在石英砂干法除铁中,磁辊表面温度过高是容易被忽视的问题。磁辊温度一高,钕铁硼磁材的磁力逐渐衰减,除铁效果悄悄下降,而且这种衰减往往不可逆。问题通常出在磁辊散热和给料温度两个环节。

永磁干式辊式磁选机磁辊表面温度过高怎么办?.jpg

给料温度过高是磁辊升温的首要原因。 前端烘干机出料后如果未经充分冷却就直接进入磁选机,热砂把热量传导给磁辊,磁辊表面温度可达70℃以上。钕铁硼磁材工作温度超过80℃后磁畴结构开始变得不稳定,长期如此磁力永久性衰减。建议在烘干机与磁选机之间加装冷却输送段,让砂料自然降温至40℃以下再进入磁选。若产线空间有限,可在磁选机前增设风冷装置,用冷风快速带走物料热量。

磁辊内部散热结构堵塞同样会导致温度积聚。 部分磁辊设计有内部通风道或散热孔,长期运行后粉尘进入通风道,散热通道被堵死,磁辊内部热量散不出去。每季度拆开端盖用压缩空气吹扫内部通风道,保持散热通道畅通。若磁辊为全封闭结构,则需检查外部散热风扇是否正常运转,风扇损坏的及时更换。

给料量过大导致磁辊持续高负荷运转,温度也会偏高。 物料在磁辊表面快速通过时摩擦生热,给料量越大摩擦热越多。检查给料量是否超过设备额定处理能力,超标时适当调低给料速度,或加宽磁辊有效宽度分散负荷。磁辊表面温度建议控制在60℃以下,用手触摸感觉烫手时就应该停机排查。

日常巡检中每班次用手背触碰磁辊轴承座感受温度,发现明显偏高时按“先查给料温度、再查散热通道、最后看给料量”的顺序排查。设备运行遇到问题,欢迎联系山鲁重工技术团队沟通交流:张经理 13583776655(同微信)。


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