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What is the application of a slewing bearing?


2023-07-01 17:14:17

Slewing bearings are also called turntable bearings, and some people also call them: slewing bearing, slewing ring bearing, turntable bearing, slewing ring. The slewing ring is widely used in the actual industry, and it is called "the joint of the machine". Essential important transmission components. With the rapid development of the machinery industry, slewing bearings have been widely used in marine equipment, engineering machinery, light industrial machinery, metallurgical machinery, medical machinery, industrial machinery and other industries. The slewing ring is a large bearing capable of bearing comprehensive loads, and can simultaneously bear large axial and radial loads and overturning moments.

Slewing Bearings are used in the swiveling areas of various type of machineries, e.g. -Construction building machinery such as power shoveles, truck-mounted cranes. -Freight handling machinery. -Industrial machines and robots etc.

Slewing bearings are widely used, and construction machinery is the earliest and most widely used place for slewing bearings, such as soil moving machinery, excavators, pulverizers, stackers and reclaimers, graders, road rollers, power compactors, rock drills, roadheaders, etc. Others are concrete machinery: concrete pump truck, concrete mixing and placing boom integrated machine, belt feeder Feeding machinery: disc feeder, sand mixer; lifting machinery: wheeled crane, crawler crane, gantry crane , tower crane, fork crane, accompanying crane, gantry crane; foundation treatment machinery: impact reverse circulation drilling rig, rotary drilling rig, impact rotary drilling rig, rotary drilling rig, reverse circulation rotary drilling rig, positive circulation rotary drilling rig, Long spiral engineering drilling rig, diving engineering drilling rig, static pressure pile driver, pile driver; engineering ship: dredger; special vehicle: bridge inspection vehicle, fire truck, window cleaning machine, flat beam transport vehicle, aerial work vehicle, self-propelled Aerial work platforms; light industrial machinery: beverage machinery, bottle blowing machines, packaging machinery, filling machines, rotary bottle separators, injection molding machines; marine cranes: floating cranes.

slewing ring; equipment platform

A method to solve the noise of the slewing bearing.

There are two common solutions to rotary bearing noise: dust noise and noise.

(1) Control method of dust noise.

There are foreign objects such as dust in the rotary branch pipe. , causing non-periodic vibrations. . The so-called dust sound, the magnitude of the vibration and noise is variable, with or without.

Dust-proof method: Improve the cleaning method of slewing ring/slewing bearing. Strictly clean the bearings, shafts, seat holes and fittings before installation; remove foreign matter in the lubricant; improve the sealing of the bearing; avoid the use of plastic cages containing impure materials or embedded foreign matter.

(2) Control method of scar sound.

If there are cracks, indentations or corrosion on the rolling surface of the slewing bearing, It will produce periodic vibration and noise like riveting rivets, and its period may be fixed, but most of them have a certain corresponding relationship with the rotational speed. Scars will continue to appear in the channel, scars appear on the steel balls, and this noise will vary with the installation and lubrication conditions. The control method of this kind of noise: do not knock the bearing during installation, prevent the bearing from tilting when the bearing and shaft are assembled and put into the bearing housing; prevent bearing corrosion during storage and shock vibration during transportation; use high-viscosity grease . (3) Noise caused by lubrication factors and its countermeasures Wrong lubricant selection, insufficient lubricant or aging induration will lead to vibration and noise of slewing ring/slewing bearing, and this noise has no certain regularity. In this case, it is only necessary to select the appropriate lubricant, adjust the amount of lubricant, prolong the service life of the lubricant, and reasonably determine the replacement cycle.

(3) Noise related to the host and its countermeasures.

This kind of noise is not caused by the bearing alone, so it is invalid to find the cause simply from the bearing. We should give full attention to the host and improve its performance if necessary. . This article focuses on beeps and frame resonances that are common in electric motors. The hum of the motor and its countermeasures The axial vibration of the motor shaft produces a very high frequency noise - hum, which has the same frequency as the axial vibration and can be constant. Can also be mutable. The method of preventing buzzing is the same as the method of preventing axial vibration. b Bearing frame resonance sound and countermeasures When the axial natural vibration of the outer ring mass causes the axial bending natural vibration of the bearing frame, a noise called resonance sound will be generated. The method of increasing the pre-tightening force can increase the axial natural frequency of the outer ring mass system, destroy the resonance condition and reduce the noise.