The introduction of slewing ring

Wheel bearings, slewing ring, also known, is a way to withstand large axial load, radial load and overturning moment of large self aligning ball bearings  Wheel bearings are generally with the mounting holes in the gear or external gear, lubrication holes and sealing devices, which enable the host compact design guide reliable, and easy maintenance.
     Wheel bearings with or without gear, external gear teeth and inside the four-point contact ball bearings, double row angular contact ball bearings, cylindrical roller bearings cross, cross tapered roller bearings and three-row cylindrical roller bearings and other kind of structure types. Where the four-point contact ball bearings with high static load capacity; Cross cylindrical roller bearings with high dynamic load capacity; cross tapered roller bearings make through preloaded bearings with a larger supporting rigidity and high rotation accuracy.
     Wheel bearings are widely used on lifting machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery and mechanical precision radar and missile launchers and other large rotary device.
Depending on the turntable bearing structure type structure can be broadly divided into the following types:
A four-point contact ball bearing turntable
2, double four-point contact ball bearing turntable
3. Cross cylindrical roller wheel bearings
4. Cross tapered roller wheel bearings
5, three-row cylindrical roller bearing turntable

Wheel bearing applications in various fields of anatomy

Wheel bearings, slewing ring, also known as, is a way to withstand the large axial load, radial load and overturning moment of large bearings. Wheel bearings generally come with mounting holes, internal gear or external gear, lubrication holes and seals, which enables a host compact design guide reliable, easy maintenance.Have toothed wheel bearings, the outer and inner tooth tooth four-point contact ball bearings, double row angular contact ball ferris wheel bearing, crossed cylindrical roller bearings, tapered roller bearings and cross three-row cylindrical roller bearings, and other kind of structure type. Where the four-point contact ball bearings with high static load capacity; Cross cylindrical roller bearings with high dynamic load capacity; cross-tapered roller bearings through preloaded make bearings with a larger supporting rigidity and high
rotation accuracy.
Wheel handpiece bearing are widely used in lifting the machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery and mechanical precision radar and missile launchers and other large rotating equipment.
Wheel bearings used in various fields.
1. Wind Turbine
The connecting portion of the tower with a yaw bearing is mounted in the cockpit, the pitch bearing is installed with the hub at the root portion of each blade is connected. Each wind generator with a yaw bearing and three pitch bearing. Yaw, pitch bearing ring material selection 42CrMo, heat treatment with the overall quenching, raceway surface hardening. Yaw, pitch bearing force the situation is complex, and to withstand shock and vibration is relatively large, and therefore, require both bearings to withstand the impact, but also bear a greater load. Wind turbines host life requirements of 20 years, a larger bearing installation costs, thus requiring yaw, pitch bearing life have reached 20 years. The matrix hardness of the bearing rings 240-280HB, able to withstand impact without the occurrence of plastic deformation, while the raceway surface quenching hardness 55-
62HRC, contact fatigue life can be increased, so as to ensure long bearing life
requirements.
2. Ship Cranes
Ship Cranes general use double Reducing ball, four-point contact ball bearing turntable Tri-row roller tooth structure, depending on the load carrying capacity, three-row roller wheel bearings typically used for heavy-duty cranes, four-point contact ball slewing and Reducing double ball bearing turntable for light cranes.
Since the crane at -20 ° C - +45 ° C under work environment, high class material bearing on the mechanical performance requirements.
3. offshore crane
Depending on the load capacity requirements, offshore crane usually using four-point contact ball slewing and three-row roller gear wheel bearings.
Application in offshore crane turntable bearing with special material requirements, the mechanical properties of the material to be able to guarantee the safety factor under extreme load, forging sample Charpy impact test to reach the average of 42J @ -20 ° C or 27J @ -40 ° C. Bearing Classification Society certification to be finished.
4. harbor mobile cranes
4 meters of harbor cranes usually use internal or external gear teeth diameter three-row roller slewing bearings to withstand high overturning moment.
5. Stacker Reclaimer
Reclaimer with column wheel bearings usually ball joint, three-row roller and cross-roller type, most ultra-three meters in diameter. Due to poor working conditions, dusty, these bearings have a high load capacity, long life, good sealing performance characteristics.
6. Ferris Wheel
For four-point contact ball bearing turntable Ferris wheel on the outside diameter of 4100mm, thickness 85mm
7. unloader
Unloader wheel bearings with external teeth usually three-row roller structure, about 4 meters in diameter.
8. Crane
Tower crane used wheel bearings usually small size four-point contact ball bearing turntable or dual volleyball dial diameter of not more than two meters.
9. The radar antenna
Shortwave antenna generally with three-row roller bearing turntable sub-structure, the rotation is slow.
10. TBM
Shield machine with turntable bearing diameters from 2.5 m to 6 m range, some larger diameter, these bearings working under very harsh conditions, bearing carrying a large load, corrosion resistance, short life.
11. ladle turret
Ladle turret slewing bearing usually with three-row roller structure, due to work under harsh conditions with dust and high temperature conditions, and on the holder, grease and seals have very high demands.
12. Construction Machinery
Wheel ring bearing typically used in construction machinery in a small four-point contact

ball bearing turntable, a diameter of not more than two meters.

The solution of slewing ring bearing noise

   Slewing ring bearing noise common to have two kinds of dust acoustic sound and scars solution is as follows:
   (1) The control method of the dust acoustic
    Rotary branch within the dust and other foreign matter, non-periodic vibrations occur, the so-called dust acoustic, vibration and noise uncertain size, and with or without.Sound dust control methods: improving the cleaning method slewing ring / turntable bearing, the bearing before installation, shaft, housing bore all the rigorous cleaning and matching parts clean; remove foreign objects inside the lubricant; to improve angular contact ball bearing seals; avoid the use of impure material or a foreign body embedded plastic cage.
   (2)The control method scars sound
    If slewing ring rolling surface cracks, indentations or corrosion occurs as a rivet as periodic vibration and noise, the cycle may be fixed but most of the speed of a certain relationship, the scars on the channel will be continuous occurs, wounds hidden when on the ball, and this noise and there are some changes with the installation and lubrication conditions.
    Such noise control method: When installing not knock bearing, the bearing and the shaft bearing assembly before loading to prevent loading ramp when the bearing; when the stock to prevent shock and vibration to prevent bearing corrosion and transport; the use of high viscosity grease .
   (3) Noise and Countermeasures lubrication caused by factors Lubricant selection errors, lack of lubricant or the occurrence of aging sclerosis, can cause slewing ring / turntable bearing vibration and noise, and this noise is not necessarily the rule. In this case, only the choice of a suitable lubricant, lubricant adjust its volume, extend lubricant life and reasonably determine the replacement cycle.
   (4) the noise associated with the host and Countermeasures This noise is not simply caused by a handpiece bearing

, and thus to find a single reason from the bearing areas is ineffective to deal with a host full attention, to improve the performance of the host when necessary. The main narrative is now common in motor beeps and rack resonant sound.