Seal air is injected into the labyrinth seals located at the main motor shaft (top and bottom) and at the pinion shaft driving the motor.

密封空气被注入到主马达轴（顶部和下部）和驱动马达的齿轮轴的迷宫式密封里。

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Labyrinth seal and piston ring provide a dual sealing system, keeping oil clean and reducing wear.

曲径汽封和活塞环提供了双密封系统，使油保持洁净并减少磨损。

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Some design defects occurred since it was put into operation in 2005. The labyrinth seal of grinding table had wind leakage, coal powder leakage.

自2005年投运以来，逐渐出现了一些由于设计原因产生的缺陷。 磨盘迷宫密封出现了漏风、漏粉、漏渣现象。

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