Many modern large-scale construction machinery such as asphalt mixing plant, stabilized soil mixing plant, combined crusher and so on are very large in scale, each part of the mass of dozens to hundreds of tons, moreover, most of the construction machinery operates in harsh environments such as silt, gravel, rain and snow, and its technical condition is bound to decline faster than that of other machinery, there will be different degrees of looseness, wear, corrosion and scaling in the coordination of parts, and the coordination between parts and mechanisms will be affected to different degrees, as a result, the performance indexes such as power performance, economy performance, reliability and so on decline, even causes the machine accident. Therefore, must pay attention to the construction machinery parts, especially bearing selection and technical maintenance, a high-quality bearing can improve the working life of construction machinery, improve working efficiency, and thus improve economic efficiency.