吸水绳随着转轴的旋转而作圆周运动，吸水绳上的冷却水受离心力从出水孔处甩出，散落到磨盘上侧面，从而对磨盘进行散热;在转轴旋转过程中，漏斗随之作圆周运动，橡胶棒也同样做圆周运动，橡胶棒在接触到出水开口后，拨动出水开关，打开出水部，冷却水通过出水部流入到此时位于出水部正下方的漏斗内，从而在使用过程中自动添加冷却水。 
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[0006]上述技术方案中，优选的，所述转轴外壁上设置有若干个与所述出水孔一一对应的挡板，所述挡板位于所述出水孔上方。设置挡板后，从出水孔出去的水直接撞击到挡板内侧，保证从出水孔出去的冷却水能够全部散落到磨盘上侧面对其进行散热，