为什么脱水筛用久了侧板焊缝会出现裂纹?


发布时间:

2026-10-29

振动脱水筛在石英砂产线中连续运行,筛框开裂是较严重的结构故障。裂纹多出现在侧板焊缝、横梁连接处或激振器安装座附近,一旦发现不及时,裂纹扩展可能导致整台筛机报废。

振动脱水筛在石英砂产线中连续运行,筛框开裂是较严重的结构故障。裂纹多出现在侧板焊缝、横梁连接处或激振器安装座附近,一旦发现不及时,裂纹扩展可能导致整台筛机报废。问题通常出在焊缝质量、应力集中和运行负荷三个方面。

为什么脱水筛用久了侧板焊缝会出现裂纹?.jpg

焊缝质量不过关是筛框开裂的首要原因。 筛框侧板与横梁、加强板的连接焊缝,若焊接时存在咬边、气孔或未焊透等缺陷,运行中在交变振动应力作用下,缺陷处逐渐扩展成裂纹。检查时重点观察焊缝表面有无锈迹渗出,锈水痕迹往往就是裂纹的起点。发现裂纹后,先用角磨机沿裂纹方向开V形坡口,清除干净后重新焊接,焊后打磨平整。补焊时注意控制层间温度,避免热影响区过大产生新的应力集中。

应力集中同样会导致筛框开裂。 筛框上开孔、切口或截面突变处,都是应力集中的敏感部位。激振器安装座与侧板的连接处若过渡不圆滑,振动能量集中传递到该处,时间一长便出现裂纹。建议在应力集中部位加焊加强板,加强板边缘打磨成斜坡过渡,减少截面突变。日常巡检中重点检查这些部位有无异常振动或异响。

长期超负荷运行会加速筛框疲劳。 给料量超过筛机额定处理能力时,筛框承受的振动负荷增大,金属疲劳速度加快。检查运行电流是否长期超过额定值,超标时适当调低给料量。另外,筛框地脚螺栓松动也会导致筛体与基础之间产生相对位移,额外增加筛框的扭曲应力。每月检查一次地脚螺栓紧固情况,发现松动立即拧紧。

日常巡检中每周检查一次筛框焊缝和连接部位,发现锈迹、裂纹或异常振动及时处理。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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