When the mechanism is running, the part where the railway bearing is installed is allowed to have a certain temperature. When the structure of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the bearing temperature is too high.
The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the bearing assembly is too tight; the bearing race rotates on the shaft or inside the casing; Large; INA bearing cage or rolling body fragmentation.
Rolling bearings allow a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact, the bearing is faulty.
The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the coupling relationship between the bearing and the housing, the railway bearing and the shaft is broken, causing the axis to deviate from the correct position and generate an abnormal sound when the shaft is moving at a high speed. When the bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the INA bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.
1.Maintenance of bearing maintenance and overhaul
Maintenance and overhaul
In order to maintain the original state of the bearing in a good condition for as long as possible, maintenance and repair are required to prevent accidents, ensure the reliability of operation, and improve productivity and economy.
Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections.
(1) Inspection of the INA bearing in the operating state, inspection of the vibration, vibration, temperature, maintenance of the lubricant condition, and determination of the period of replacement or replacement of the lubricant.
(2) Inspection and repair of the bearing When the machine is regularly inspected and replaced, the railway bearing taken out is fully observed, the condition of the track surface is damaged, and whether it can be reused.
2. Maintenance under operating conditions
Maintenance items in operation include the rotary sound of the bearing, vibration, temperature, and the condition of the lubricant.
(1) The rotary sound of the bearing
Use a diagnostic device or the like to investigate the noise level and sound quality.
Even if a few railway bearings have abnormal sounds and irregular sounds in the fatigue peeling state, it is possible to hear them if they are skilled.
Representative abnormal sounds are shown on the next page
(2) Bearing vibration
The bearing vibrator is used to quantitatively measure the amplitude and frequency of the vibration, and the damage condition of the bearing is inferred.
However, since the use conditions of the INA bearing are different from the measurement position, it is necessary to use the measured value of the machine to determine the criterion.
(3) Bearing temperature
The bearing temperature usually rises slowly after the start of the run and reaches saturation after a while. The steady temperature of railway bearings varies with mechanical heat capacity, heat release, speed and load.
When the bearing temperature does not rise to a saturated state and rises abnormally, consider the cause of the following page, stop the operation and take necessary measures.
(4) Lubrication
Investigating the use of grease and lubricants is effective in understanding the operating conditions of railway bearings. Of course, it is possible to judge the leakage, discoloration, and deterioration of grease or oil from the moisture, impurities, iron powder, and the like therein.
When there is a leak of lubricant and foreign matter such as iron powder or metal powder, the amount of leakage, INA bearing temperature and vibration are periodically observed. If it is considered abnormal, early inspection is performed.
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