The rumbling of check project have bearing in operation, vibration, temperature, lubrication condition and so on, details are as follows: A rumbling, F&F bearing The sound device is adopted to the size of the rolling sound of bearing in operation and the quality inspection, bearing even with slight stripping damage, also an exception and irregular, and with the sound of the measuring device can distinguish. Second, the F&F bearing vibration

F&F bearing vibration is sensitive to bearing damage, such as peeling, indentation, rust, crack and wear will be reflected in the bearing vibration measurement, therefore, through the use of special bearing vibration tester (frequency analyzer, etc.) can measure the size of the vibration, through frequency points cannot deduce the abnormal situation.Measured values of bearing or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the machine after judgment standard.

Three, F&F bearing temperature F&F bearing temperature, generally have a bearing on the surface of the outdoor temperature can be measured, push, if using the oil hole can directly measure temperature of bearing outer ring, is more appropriate.In general, the temperature of the bearing with operation began to slowly rise, 1 to 2 hours to reach a steady state.The normal temperature of bearing due to the heat capacity of the machine, heat dissipating capacity, rotational speed and load.If the appropriate lubrication,

installation department, the bearing temperature will rise sharply, appear unusually high temperature, must stop at this moment, take the necessary precautions.Based on a lot of testing According to the table 4-1 lists the various kinds of mechanical bearing outer temperature averages at work, for your reference.Due to temperature lubrication, rotational speed, load, the influence of environment, the temperature range of values in the table only said roughly.Using thermal device can monitor the bearing temperature at any time, and realize e. automatic alarm when the temperature is more than the household or stop to prevent the shaft accidents.

Four, lubrication (a) F&F bearing lubrication Lubrication on the fatigue life of rolling bearing, friction and wear, temperature rise, vibration and so on have important influence, not the normal lubrication, bearing cannot work.Analyze the failure reasons of bearing show that about 40% of the bearing damage is related to bad lubrication.Therefore, good lubrication of the bearing is an effective measure to reduce the F&F bearing friction and wear.In addition, the bearing lubrication and cooling, sealing, rust and moderate impact of a number of roles, the effect of axial bearing lubrication can be briefly stated below:

A. in the contact between two rolling or sliding surface formed between a layer of oil film separates two surface, reduce the friction and wear of contact surface. B. using oil lubrication, especially the circulating oil lubrication, oil mist lubrication and oil lubrication, the bearing lubricating oil take most of the internal friction heat, F&F effective heat dissipation effect. C. using grease lubrication, can prevent external dust and other foreign body into the bearings, sealing effect. D. lubricant function to prevent corrosion of metal. E. extend the fatigue life of bearing. (2) the comparison of grease lubrication and oil lubrication F&F bearing lubrication method is roughly divided into two kinds of grease lubrication and oil lubrication.In order to give full play to the function of the bearing, it is important to use according to the way and purpose, the lubrication method.Table 4-2 shows the advantages and disadvantages of grease lubrication and oil lubrication.

(3) the grease lubrication Grease is composed of base oil, thickener and additive of lubricants.When the choice, should choose is very suitable for bearing conditions of use of embellish grease, because the trademark is different, also there will be a very big difference on performance, so when the choice, must pay attention to.Bearing the commonly used sodium calcium base grease, grease, grease sodium calcium base grease, lithium grease, aluminium base grease and molybdenum disulfide grease, etc.Number of filling grease in the bearing to full of bearing internal space 1/2-1/3 as appropriate.When high speed should be reduced to one third.Too much grease temperature increase.

(4) the choice of the grease According to the working temperature selection of grease, the main indicators should be drop point, oxidation stability and low temperature performance, drop point generally can be used to evaluate the high temperature performance, bearing the actual working temperature should be lower than 10-20 ℃ drop point.The use of synthetic grease temperature should be low in the dropping point 20-30 ℃.Based on choosing grease, bearing load of heavy duty should choose small grease penetration.When working under high pressure in addition to the penetration of small, must have high oil film strength and extreme pressure properties.According to the environmental conditions choosing grease, calcium base grease is not easy to dissolve in water, suitable for dry and less moisture environment

(5) oil lubrication Under the condition of high speed, high temperature, lubrication has not timely can use oil lubrication.Through the circulation of lubricating oil, can take away a lot of calories. Is an important characteristic of lubricating oil viscosity, viscosity directly affect the liquidity of lubricating oil and the size of the friction surface is formed between the oil film thickness, the bearing working temperature of lubricating oil viscosity is usually 12 to 15 CST. Speed the Gao Yingxuan lower viscosity, the more load weight should choose high viscosity.Commonly used lubricating oil has high-speed machine oil, machine oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc. F&F lubrication methods include:

A. oil bath lubrication Oil bath lubrication is the most common lubrication method, suitable for low, medium speed, bearing lubrication, the bearing part is immersed in a tank, the bearing parts of lubricating oil by rotating, and then flow back to the oil level of oil tank should be slightly lower than the lowest at the center of the roller. B. oil drip lubrication Oil drip lubrication is suitable for need to ration oil bearing parts, drops of oil it is advisable to general one drop every 3 to 8 seconds, too much oil will cause the bearing temperature increased. C. circulating oil lubrication Filter in the oil pump oil to the bearing parts, through the bearing lubricating oil filter cooling after use.Because of the circulating oil can take away a certain quantity of heat, cooling the F&F bearing, therefore method is suitable for high speed bearing parts. D. spray lubrication Mixed with dry compressed air after the sprayer and oil formation oil mist, spray F&F bearing, can effectively make the bearing cooling airflow and can prevent the intrusion.This method is suitable for high speed, high temperature lubrication bearing parts. E. jet lubrication With oil pump to pass through the nozzle shot into the bearing, high pressure oil into the bearing of the bearing at the other end into the oil in the tank.When bearing at high speed, rolling element and cage with high rotate speed makes the surrounding air, the air in general it is difficult to be sent to the bearing lubricating oil lubrication method, then must use the method of high-pressure jet spray the lubricating oil to the bearings, the position of the nozzle should be placed between inner ring and retainer center.

(6) solid lubrication Used in some special conditions, adding a small amount of solid lubricant grease, such as adding 1 of 3-5% molybdenum disulphide can reduce wear and improve the compressive strength heat-resistant ability, for high temperature, high, high vacuum, corrosion resistance, resistance to radiation, and the special conditions such as extremely low temperatures, the solid lubricant in engineering plastics and powder metallurgy material, lubricating bearing parts can be made with, such as the solid lubricant with adhesive bonding on the raceway, cage and rolling body, lubrication film formation, has certain effects on reducing the friction and wear.

(7) supplement and replacement of lubricant A. the added time interval of the grease Due to machinery, aging, and the increase of pollution, fill in the bearing configuration of lubrication base will gradually lose its lubrication performance.Therefore, the lubrication rank need to continuously add and update.Lubricant added time interval will be due to the formation, size and speed of the bearing is different, according to the running time of general interval to add grease.In addition, when the bearing temperature exceeds 70 ℃, under the condition of bearing temperature rise every 15 ℃, then use the added time interval to reduce half of the grease.

Double sealed bearings is already loaded lipid during manufacturing, "HRB" used in these products is a standard grease, total operating temperature scope of the provisions and other performance is suitable for the occasion, and fill in the amount of fat also accordingly with the bearing size, the service life of grease can generally be over bearing life, except for special occasions, do not need to add grease. B. oil change cycle Of lubricating oil change cycle due to the using conditions and oil amount is different, in general, under the operating temperature of 50 ℃, less dust, when used under the good environment of change once a year, when the oil temperature reaches 100 ℃, be replaced every 3 months or less.