混砂机是铸造生产中造型、制芯用砂必不可少的关键设备。型砂的质量除与型砂的组成成份及配比有关外,也与混砂机的碾砂质量有很大关系。碾轮式混砂机操作方便,结构简单,使用灵活,因而广泛使用。但由于混砂机使用条件恶劣,零部件磨损很快,故修换频繁,维修工作量很大。特别是碾轮轴承的密封效 Sand mixer is casting the production of modeling, the core of the core sand system is an essential key equipment. In addition to the quality of sand and sand composition and composition of the proportion of the relevant, but also with the quality of the sand mill sand mixer have a great relationship. Drum mixer is easy to operate, simple structure, flexible use, which is widely used. However, due to bad conditions for the sand mixer, parts wear quickly, so frequent replacement, maintenance workload. In particular, the seal effect of roller bearings