Shield machine

The diameter of the slewing bearing of the shield machine ranges from 2.5 meters to 6 meters, and some have larger diameters. This type of bearing works under very harsh conditions. The bearing carries a large load, has strong corrosion resistance, and has a short lifespan.

Shield machine is the main construction machinery in the shield construction method. It must have high reliability and be able to work stably and reliably. The main bearings of large-scale shield boring machines mostly use three-row roller slewing bearings. During the working process, they need to withstand large axial forces and overturning moments, as well as certain radial forces. The loading conditions are complex and it is easy to produce larger Large deformation affects the construction safety of shield tunneling machinery.

Slewing bearing includes an upper ring and a lower ring. The upper ring is connected to the lower ring through bolts to form an outer ring structure. The gear ring is located in the inner ring structure. There is a boss on the side of the gear ring. There is a boss between the boss and the upper ring. The upper raceway has an upper row of rollers in the middle. There is a lower raceway between the bottom of the boss and the lower ring. There is a lower row of rollers in the lower raceway. There is a row of rollers between the side of the boss and the outer ring structure. There are radial raceways with radial rollers in the middle. Double sealing rings are connected to the inner edge of the upper ring and the gear ring. There is a lower sealing belt connected to the bottom of the gear ring. The bearing capacity of each rolling element of the three rows of rollers is clearly divided. The upper and lower rows of rollers carry a load of 90°, giving full play to the load-bearing capacity of each load-bearing roller. Therefore, it has a large load-bearing capacity of axial force, radial force and overturning moment, meeting the requirements It meets the 360° requirements for slewing bearings of engineering machinery, especially cranes, stackers, ladle slewing tables, etc.