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<p>The <a href="https://www.wxingbearing.com/" target="_blank">bearing</a> of cement machines equipment is a vulnerable section, its running state directly impacts the performance of the whole equipment. In cement machinery gear, there are many instances of equipment failure caused by the early failure of rolling bearings.Therefore, to learn the origin of the fault, consider remedial measures to eliminate the fault, is among the keys to enhance the machine operation speed.The normal failure mode of rolling bearings is only fatigue spalling in rolling contact.The spalling surface region is roughly 2mm2 and the depth is up to 0.2millimeter ~ 0.3mm, which can be decided by the vibration detection from the monitor.Spalling may happen on the internal seat surface, outer chair, or about the rolling body.Among them, the interior seat ring as a result of high contact stress, the incidence of rupture is more.Among all sorts of diagnostic techniques for rolling bearings, the vibration tracking method is still the most important one. In general, the time-domain analysis method is simple, appropriate for a small noise disturbance, is a simple diagnosis of a fantastic method; Among that the frequency-domain diagnosis methods, the resonance demodulation method is the most mature and reliable, which is suitable for precise diagnosis of bearing faults. The time-frequency analysis method is similar to the resonance demodulation method in that it can properly describe the time and frequency characteristics of fault signals and has more benefits.Analysis of the damage form of rolling bearing and curative measures(1) Overload.Severe surface spalling and wear indicate that the collapse of the rolling bearing because of early fatigue due to overload (along with a particular degree of fatigue due to a too-tight match ).The overload will also bring about critical wear of bearing ball raceways, a large area of spalling, and sometimes accompanied by overheating. The remedy is to decrease the bearing load or increase the bearing ability.(2) Overheating.A change in color of the roller raceway, ball, or retainer suggests signs of the bearing.The increase of the temperature will lessen the part of lubricants so that the oil desert isn't easy to shape or entirely disappear. If the temperature is too high, the material of the raceway and steel ball will anneal and its hardness will decrease. This is largely the warmth disadvantageous or the heavy load, the high-speed state cooling insufficient cause. The solution is adequate heat dissipation and additional cooling.(3) Vibration erosion beneath the low load.Elliptical wear marks at the axial position of each ball indicate failure due to excessive external vibration or low load corrosion once the posture isn't working and no lubricating movie is produced.The remedy would be to isolate the bearing or add anti-wear additives to the bearing grease.(4) Setup problem.Mainly listen to the following aspects: First, look closely at the use of force.If there are intervals of the pit to the raceway, the load has exceeded the elastic limit of this material.This is due to static overload or severe impact (e.g., hammer hitting the bearing during installation).The proper installation system is to apply force only to the ring to be pressed (don't push the outer ring when the inner ring is installed on the shaft).Secondly, focus on the mounting direction of the contact bearings. Angular contact bearings have an elliptical contact zone and then bear axial push only in 1 direction.When the posture is assembled from the opposite direction, the bearing surface will create a groove wear belt because the ball reaches the edge of the raceway.Therefore, attention should be paid to the right direction of setup.Third, listen to alignment.The wear marks of this steel ball are skewed and not parallel to the raceway management, indicating the bearing is not in alignment during installation.If that the deflection > 16000, simple to cause the bearing temperature increase and serious wear.The reason might be that the shaft contains bent, the shaft or the box body has burr, the clamping surface of the surrogate mum isn't perpendicular to the thread axis and thus on. Therefore, the installation needs to pay attention to check the diameter jump condition.Fourth, should pay attention to the correct cooperation.The circumferential wear or discoloration on the contact surface of the outer and inner rings of the posture is caused by the loose match between the posture and its fitting parts.The oxide created by abrasion is a kind of pure brown abrasive. As a result, the bearing will suffer from additional wear, heat, and sound, as well as a collection of issues like diameter jump. Therefore, good coordination should be paid attention to when assembling.For instance, there's a serious spherical wear trail in the base of the racetrack, which indicates the bearing clearance gets smaller due to tight match, and the bearing will soon fail due to fatigue and wear due to the increase of torsional distance and also the increase of bearing temperature. At this stage, provided that the radial clearance is suitably restored and the interference quantity is reduced, this problem can be solved.Fifth, ordinary fatigue failure. Normal fatigue failure is characterized by irregular material spalling on any running surface (for instance, raceway or chunk ) and gradual expansion leading to increased amplitude. If the life of ordinary bearings cannot meet the requirements of usage, only to choose a new more advanced bearing, or enhance the specification of their initial class bearing, to improve the bearing capacity.Sixth, improper lubrication. All rolling bearings require continuous lubrication using a high excellent lubricant to maintain their design performance.The bearing is shielded from the direct connection between compounds by an oil film formed on the rolling body and the chair ring.If it's well lubricated, friction can be lowered so that it does not wear out.Particles in lubricating oil or dirt contamination, though those contaminant particles bigger than ordinary oil film thickness, as a result of hard particles nevertheless produce abrasion, even though the oil film and bearing surfaces to produce local stress, which radically shortens the posture life. The concentration of water at the lubricating oil or grease, even as low as 0.01%, is enough to shorten the original life of the posture by half.If water melts in oil or grease, the service life of the posture decreases with increasing water concentration. The remedy would be to replace the rancid oil or grease; Better filters should be installed at normal times, sealing should be raised, and clean operation should be paid attention to during storage and installation.Seventh, corrosion.Red or brown spots on raceways, steel balls, retainers, and outer and inner ring surfaces indicate corrosion failure of bearings due to exposure to corrosive liquids or gases. It will cause greater vibration, increased wear, enhanced cerebral clearance, decreased preload, and fatigue failure in the limit. The remedy is to permit fluid to drain out of the posture or to grow the general and outside seal of the posture.Fault causes and therapy of fan bearings according to incomplete data, the failure rate of the fan vibration from the cement plant is 58.6% in the highest, since the vibration will cause the fan operation to unbalance.Among them, improper alteration of posture firming sleeve will result in abnormal temperatures increase and vibration of their posture.Such as a cement plant in the equipment maintenance throughout the replacement of the fan blade. Both sides of the wheel blade are fixed with fixed-wing and bearing housing bearing.The fault of high temperature and higher vibration worth of free posture will occur in the re-test.It's found that the posture roller in a specific place of the rotating shaft also rolls at the non-load area once the upper cover of the bearing housing is eliminated and the mounting clearance might be insufficient. The dimension proves that the internal clearance of the bearing is simply 0.04mm and the eccentricity of the rotating shaft is up to 0.18mm.Due to the large span of the left and right bearing, it is difficult to avoid the deflection of the rotating shaft or the mistake of this bearing installation Angle. Consequently, the large fan adopts the spherical roller bearing that can be mechanically adjusted to the center.But when the inner clearance of the posture is inadequate, the internal rolling regions of the bearing because of the restriction of motion space, its automatic function of the heart is affected, vibration value will boost instead. The internal clearance of the posture decreases with the rise of this match stiffness, as well as the lubricating oil film can't be formed. After the clearance of the bearing operation drops to zero due to the temperature increase, if the heat generated by the bearing operation is still greater than the heat escaped, the bearing temperature will climb rapidly.At that moment, if not instantly stop, the bearing will finally burn. The excess emission of the bearing inner ring and shaft is the cause of the abnormally high temperature of the bearing in this situation.During therapy, eliminate the setting sleeve, readjust the fitting tightness of the shaft and the inner ring, and take 0.10millimeter clearance after replacing the bearing.After reinstallation, restart the enthusiast, and the vibration value and operating temperature of the bearing return to normal.Bearing internal clearance is too small or the layout and manufacturing precision are not great are the principal causes of its large running temperature of the posture, to facilitate the installation, repair, and upkeep of the fan gear, generally at the design of the bearing housing bearing with taper hole posture interior ring. However, it is also easy to cause problems as a result of the negligence of the setup procedure, especially the proper clearance adjustment.The internal clearance of the bearing is too small and the operating temperature climbs rapidly; Bearing inner ring taper hole and tight sleeve match too loose, the bearing isn't hard to lose because of the match surface and burn in a short time.To sum up, bearing failure, needs to maintain the design, maintenance lubrication direction, operation, and other areas of the use of attention.This can reduce the maintenance cost of machinery and equipment and extend the performance speed and service life of machines and equipment.</p>
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