Three Row Cylindrical Roller Slewing Bearing For Port Crane ,Grab Ranes, Claimers

We are offering three row cylindrical roller slewing bearing for port crane ,grab ranes, claimers. 1 moq:1 set;delivery time:35 days
2 iso9001:2008 certificate
3 oem service
4 made to order
three-row roller slewing ring has three seat, up and down, and the radial raceway separately from each other, so that the load of each row of the rollers can be determined exactly. Able to withstand various loads, the four products in the largest carrying capacity of a shaft, the radial dimensions are larger, solid structure, particularly suitable for heavy machinery requiring a larger diameter, such as bucket wheel excavators, wheel cranes, marine cranes, port cranes, molten steel operation tables and large-tonnage truck crane and other machinery.
turntable bearing, depending on the structure type can be broadly divided into the following types of structure type:
1, four-point contact ball bearing turntable
2, double reducing ball bearing turntable
crossed cylindrical roller slewing bearing
4, three-row cylindrical roller combination turntable bearings
manufacturers solar slew drive/ring gear bearing
solar slew drive/wind turbine slewing bearing
slewing bearing / slewing ring bearing
     slewing bearing is a kind of special structure of large bearings which can withstand large axial load, radial load and overturning moment, integrating supporting, rotation, transmission, fixed and other functions. Under normal circumstances, slewing bearings have their own mounting holes, lubricants and seals, which can meet various of host need  under different  working conditions; on the other hand, slewing bearings themselves are compact, easy to guide the rotation,easy installation and easy maintenance, so they widely used in material handling equipments, mining machines, construction machinery, port machinery, wind power generation, medical equipments, radar and missile launchers and other large rotating devices.
according to different structure, slewing bearing can be divided into the following types:1, the four-point contact ball slewing bearing2, double row different diameter ball slewing bearing3, crossed cylindrical roller slewing bearings4, three-row cylindrical roller combined slewing bearing
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