S114混砂机碾轮轴承原设计的密封型式如图1。虽然采用了迷宫式密封,但由于罩和曲臂之间的间隙较大,容易积聚砂尘,且挡盖和曲臂之间也有较大间隙。当混砂机运转时,由于挤压作用砂尘会进入空间,此空间又将轴承卡死。每次检修都发现碾轮内侧轴承积聚的砂尘多于外侧轴承的砂尘。因碾轴外侧的轴承挡盖是固 S114 sand mill roller bearing seal design of the original design shown in Figure 1. Although a labyrinth seal is used, sand and dust accumulate easily due to the large clearance between the cover and the crank arm, and a large gap between the cover and the crank arm. When the sand mixer is running, the sand will enter the space due to the squeezing action, which in turn will jam the bearing. Each inspection found that the inner roller bearing accumulation of sand dust more than the outside bearing sand. Because of the outer shaft bearing cover is solid