Slewing bearing applications

Slewing bearing are widely used in lifting machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery, precision machinery radar and missile launchers and other large rotating device.

1. Wind generator

Tower and yaw bearings are installed in the junction of tower and the cockpit; pitch bearings are installed in each blade root and hub joints. Each wind turbine equipment use three sets pitch bearings and a set of yaw bearing. pitch bearing ring material select 42CrMo, treatment with the overall quenching, raceway select surface-hardening. As the wind turbine yaw, pitch bearing’s force is complex and bearings withstand large shock and vibration, therefore, required bearings to withstand both the impact and greater loads. Host wind turbine life requirements of 20 years, bearing the cost of installing large, thus requiring yaw, pitch bearing life have reached 20 years. Bearing rings matrix hardness is 240HB-280HB, so it is able to withstand shocks but no plastic deformation, meanwhile raceway surface quenching hardness reach to 55HRC-62HRC, also can increase the contact fatigue life, thus ensuring long life bearing requirements.

2. Marine Crane

In general, marine crane use double-row different diameter ball, four-point contact ball, three-row roller inner gear structure slewing bearings. According to the different carrying capacity, three-row roller slewing bearings are usually used for heavy-duty cranes, four-point contact ball slewing bearing and double row different diameter ball for light crane.

As cranes working environment is -20 ° C-+45 ° C, this kind of bearing require high material mechanical properties.

3. Offshore crane

According to different requirement for carrying capacity, offshore crane usually use four-point contact ball slewing bearing and three-row roller inner gear slewing bearing.

Slewing bearing used for offshore platform crane have special material requirements: material mechanical properties should be able to guarantee the limit load factor of safety., forging sample Charpy impact test can achieve to average 42J @ -20 ° C or 27J @ -40 ° C, bearing products to the Classification Society certification.

4. Port mobile crane

Port cranes usually use internal or external gear, 4 meters in diameter three rows roller slewing bearings to withstand high overturning moment.

5. stacker-reclaimer

Slewing bearing stacker-reclaimer usually use is ball column combined type, three-row roller and cross-roller, the majority diameter over 3 meters. Due to poor working conditions, dusty, these bearings have high load capacity, long life and good sealing performance feature.

6. Ferris wheel

Usually use four-point contact ball slewing bearing, diameter 4100mm, thickness 85mm.

7. Ship unloaders

Usually use three rows of outer roller tooth structure, about 4 meters in diameter

8. Tower crane

Usually use small size four-point contact ball bearings or double-row ball, diameter not more than 2 meters

9. Radar antenna

Usually use three-row roller slewing bearing, slow rotation

10. Shield

Diameter from 2.5 meters to 6 meters, some larger diameter, these bearings work in very poor conditions, bearing a large load, corrosion resistance, short life.

11. Ladle turret in steel plant

Usually these bearing are three-row roller slewing bearings, because work in the dust and high temperature conditions, so s have high demands for maintain, grease and seal.

12. Engineering machinery

Usually use small size four-point contact ball bearings or double-row ball, diameter not more than 2 meters