永磁除铁器磁力下降怎么查?


发布时间:

2024-10-16

永磁悬挂除铁器安装在皮带输送机上方,用于清除石英砂中混入的铁屑、螺栓等机械铁。但不少客户反映设备用了一段时间后吸铁效果明显下降,皮带上方的铁杂质照样往下游跑。问

永磁悬挂除铁器安装在皮带输送机上方,用于清除石英砂中混入的铁屑、螺栓等机械铁。但不少客户反映设备用了一段时间后吸铁效果明显下降,皮带上方的铁杂质照样往下游跑。问题通常不在磁块本身,而是出在悬挂高度和料层厚度上。

永磁悬挂式除铁器现场.jpg

悬挂高度过高是吸铁效果差的首要原因。 悬挂除铁器的磁力随距离增加急剧衰减,悬挂高度超过200mm时,磁力对料层底部的铁杂质基本不起作用。建议将悬挂高度控制在150-200mm之间,具体数值根据皮带宽度和料层厚度调整。检查方法很简单:在皮带上放几颗铁螺母,观察能否被吸起,吸不起说明高度偏大,需下调悬挂链或调整支架。

料层过厚同样会导致铁杂质漏检。 料层厚度超过80mm时,埋在底层的铁屑磁力够不着,直接随物料进入下一工序。可在除铁器前加装平料板或布料器,将料层厚度控制在50-80mm。给料量需要提升时,优先加宽皮带或降低带速,不建议单纯堆高料层。

磁块退磁或密封破损也会导致磁力下降。 永磁除铁器长期在潮湿、粉尘环境下工作,密封老化后磁块受潮退磁。每季度用高斯计检测一次磁体表面磁场强度,若比初始值下降超20%,需拆开检查密封和磁块状态,及时更换退磁磁块。

日常巡检中注意观察卸铁口是否顺畅,吸附的铁屑若堆积过厚不及时清理,会形成磁屏蔽,影响后续吸附效果。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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