Fag bearing is the main vibration source that is difficult to control. Because the vibrating screen depends on a large excitation force to maintain the limit speed and friction coefficient of the working bearing, the radial force on the outer spherical bearing is large.
During the working process of the vibrating screen, a large excitation force will cause the elastic vibration of the bearing system. If the lubrication is poor, there will be large friction, so that the bearing temperature rise is too high, the thermal expansion is too large, and the radial clearance is significantly reduced, which intensifies the friction and further improves the temperature rise.Precautions for fag cylindrical roller bearing burn
Precautions for fag cylindrical roller bearing burn
The locking methods of bearings are generally divided into two types:Precautions for fag cylindrical roller bearing burn
1. Bearing attached with screws
Just lock the fastening screw on the extension part of the inner ring to fix the bearing seat, and lock it with a hexagonal wrench. Please select a hex wrench of appropriate size.
2. Bearing with locking sleeve
The fair locking sleeve has a recess, which is fair to the vibration and temperature of the outer spherical bearing. The recess is fair to its inner hole, and there is also a part of the inner ring of the bearing seat. First position the fair sleeve on the inner ring, rotate the fair bearing sleeve quickly towards the rotation direction of the shaft until it is clamped, and lock the screw with a hexagonal wrench.
The vibration system composed of bearing and eccentric system can be regarded as a single degree of freedom system. Fag bearing driving shaft and driven shaft system have a certain resonance frequency. If a certain excitation frequency is close to the resonance frequency, resonance will occur. In addition, due to the centrifugal inertia force of eccentricity, bending vibration will occur, which is the material factor affecting the service life of bearing. If the speed is close to the critical value, bending resonance will occur.
It can be inferred from the measurement of the vibration and crack of the bearing that the vibration and crack of the bearing are not sensitive to the specific vibration and crack of the bearing. Therefore, the vibration analyzer can be used to measure the vibration and crack of the bearing. Because the measured values are different due to the service conditions of the bearing or the installation position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Precautions for fag cylindrical roller bearing burn
Even if the bearing has slight peeling and other damage, it will emit abnormal sound and irregular sound. Therefore, the sound detector can be used to distinguish. The sound detector is used to check the size and sound quality of the fag sound of the running bearing, which plays the role of prevention in advance.Precautions for fag cylindrical roller bearing burn
No matter how high quality the outer spherical bearing is, if it is not used properly, it is difficult to obtain the expected high performance. The so-called fracture refers to a small part of the fracture due to the impact or excessive load exerted by the cylindrical roller bearing on the retaining edge of the raceway wheel or the local part of the roller angle. The reason for this is that the fag bearing was hit during installation. Excessive load. Poor use such as falling.
Corresponding measures shall be taken to improve the installation method (hot installation and appropriate tool clamp). Correct load conditions. Fag bearing is installed in place to support the retaining edge.Precautions for fag cylindrical roller bearing burn
State when fag bearing is jammed
The so-called jamming injury is the surface damage caused by the micro burn of the part of the cylindrical roller bearing caused by fag surface injury. Linear scars in the circumferential direction of slide surface and rolling surface. The cycloidal scar on the end face of the roller is close to the clamping wound on the shaft ring surface of the end face of the roller.Precautions for fag cylindrical roller bearing burn
Causes of fag bearing jamming
Excessive load and preloading. Poor lubrication. Foreign body bite. Inclination of inner ring and outer ring and deflection of shaft. The accuracy of shaft and bearing housing is poor.Precautions for fag cylindrical roller bearing burn
Measures for fag bearing jamming
Check the size of the load. The preloading shall be appropriate. Improve lubricants and lubrication methods. Check the accuracy of shaft and bearing housing.
The so-called burn damage state of the bearing refers to that the raceway wheel, rolling element and cage of the bearing are heated sharply during rotation until they change color, soften, deposit and damage.Precautions for fag cylindrical roller bearing burn
The second may be excessive load (excessive preloading). Excessive speed. The clearance is too small. Intrusion of water or other foreign matters. If neither of the above two cases is true, the accuracy of the shaft and bearing housing is poor and the deflection of the shaft is large. Seeing this, I think everyone wants to know the solution. First of all, we should study the lubricant and lubrication method, select the right bearing lubricant and its dosage, and correct the choice of bearing. The clearance and preloading of cylindrical roller bearing should be studied, and the sealing device should be improved. Check the accuracy of the shaft and bearing housing.Precautions for fag cylindrical roller bearing burn
According to the inspection results, if the cylindrical roller bearing is found to be damaged or abnormal, please find out the causes and formulate countermeasures according to the phenomenon of bearing damage. In addition, according to the inspection results, if there are the following defects, the cylindrical roller bearing can no longer be used and needs to be replaced with a new bearing.Precautions for fag cylindrical roller bearing burn
a. Any one of the inner and outer rings, rolling elements and cage has cracks and fragments.
b. Any one of the inner and outer rings and rolling elements has peeling.
c. The raceway surface, retaining edge and rolling element are significantly jammed.
d. The cage is seriously worn or the rivets are loose.Precautions for fag cylindrical roller bearing burn
e. The raceway surface and rolling element are rusty and scarred.
f. The rolling surface and rolling body have significant indentation and indentation.
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
h. Overheated and discolored.
i. The seal ring and dust cover of grease sealed bearing are damaged seriously.Precautions for fag cylindrical roller bearing burn