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Viewing and troubleshooting in bearing operations

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The inspection items in the operation include the rolling sound of the bearing, the oscillation, the temperature, the smooth condition, etc.; the details are as follows:
First, the bearing's tumbling sound is selected by the sounder to check the size and sound quality of the bearing's tumbling sound; even if the bearing has slight peeling and other damage, it will announce abnormal sounds and irregular sounds; .
Second, the bearing oscillation bearing oscillation is very sensitive to bearing damage; for example, shedding, indentation, rust, crack, wear, etc. will be reflected in the bearing oscillation measurement; therefore; after the selection of special bearing oscillation measuring device (frequency analyzer, etc. The large amount of oscillation can be measured. ü De Shi Zhi 豢 豢 鲆 鲆 鲆 5 5 5 5 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭 咛迩榭. The measured value is analyzed and compared to determine the discriminant specification.
Third, the temperature of the bearing temperature of the bearing; usually the temperature outside the bearing can be estimated; if the oil hole can directly measure the bearing outer ring temperature; then more suitable. Usually; the temperature of the bearing gradually rises with the beginning of the operation; After 1-2 hours, the stability is reached. The normal temperature of the bearing is due to the heat capacity of the machine; the heat dissipation; the speed and load are different. If it is smooth and the device is suitable, the bearing temperature will rise sharply; abnormal temperature will occur; It is necessary to suspend operations; adopt necessary precautions. Based on many test data; Table 4-1 lists the average value of outer ring temperature during bearing operation in various machines; for reference. Because temperature is affected by smoothness, speed, load, environment The impact of the table; the value of the table only indicates the approximate temperature scale. The thermal sensor can be used to monitor the operating temperature of the bearing at any time; and when the temperature exceeds the rule value, the alarm is activated or the ignition is avoided.
4. Smooth (1) The smooth effect of the bearing has a significant effect on the fatigue life of the rolling bearing and the conflict, wear, temperature rise, oscillation, etc.; there is no normal smoothness; the bearing can not work. Analyze the cause of the bearing damage; 40 Bearing damage of about % is related to poor smoothness. Therefore, the outstanding smoothness of the bearing is a useful way to reduce bearing conflict and wear. In addition to this; the smoothness of the bearing and heat dissipation; rust, sealing, flat cushioning, etc. Effect; the effect of smooth bearing can be briefly stated as follows:
a. An oil film is formed between the two tumbling surfaces or the sliding outer surface that touch each other to separate the two outer surfaces; the collision and wear of the touch surface are reduced.
b. When the oil is smooth, especially when the circulating oil is smooth, the oil mist is smooth and the fuel injection is smooth; the smooth oil can take away most of the conflict heat inside the bearing; it has a useful heat dissipation effect.
c. When the grease is smooth, it can avoid foreign matter such as dust from entering the bearing;
d. Smoothing agents have the effect of avoiding metal corrosion.
e. The fatigue life of the extended bearing.
(2) The smooth method of the grease-smooth and oil-smooth comparison bearing is roughly divided into two types: grease smoothness and oil smoothness. In order to give full play to the function of the bearing; it is important to use the reduction and application intention; select the smooth method. Table 4- 2 shows the advantages and disadvantages of smooth grease and smooth oil.
(3) Grease smooth and smooth grease is a smoothing agent composed of base oil; thickener and additives. When selecting; should select the grease which is very suitable for the bearing application conditions; because the trademark is different; there will also be functional Very different; so in the time of selection; it is necessary to pay attention. The smooth grease commonly used in bearings is calcium-based smooth fat, sodium-based smooth fat, calcium-sodium smooth grease, lithium-based smooth fat, aluminum-based smooth fat and disulfide Molybdenum smooth grease, etc. The amount of smooth grease filled in the bearing; suitable for 1/2-1/3 of the inner space of the overflow bearing. It should be reduced to 1/3 at high speed. Excessive smooth grease makes the temperature rise.
(4) Selection of smooth grease When selecting smooth grease according to working temperature; the primary target should be dropping point; oxidation stability and low temperature function; dropping point can usually be used to evaluate high temperature function; bearing practice temperature should be lower than dropping point 10-20 °C. The application temperature of the composition of smooth grease should be lower than the dropping point of 20-30 ° C. When selecting smooth grease according to bearing load; for heavy load, choose smooth grease with small penetration. When working under high pressure, except for small penetration. Also have higher oil film strength and extreme pressure function. When selecting smooth grease according to environmental conditions; calcium-based smooth fat is not easy to dissolve in water; suitable for dry and less watery environment (5) oil smooth in high speed, high temperature Under the condition; when the grease is not suitable, the oil can be selected to be smooth. After the smooth oil circulation; can take away a lot of heat.
Viscosity is an important characteristic of smooth oil; the viscosity of the powder directly affects the fluidity of the smooth oil and the thickness of the oil film formed by the conflicting surfaces; the viscosity of the smooth oil at the bearing operating temperature is usually 12-15 cst.
The higher the speed, the lower the viscosity should be selected; the heavier the load should choose the higher viscosity. The commonly used smooth oils are mechanical oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil and so on.
The oil smoothing method includes:
a. Oil bath smooth oil bath smooth is the most common smooth method; suitable for the smoothness of low and medium speed bearings; part of the bearing is immersed in the groove; smooth oil is brought up by the rotating bearing parts; then it flows back to the oil groove. Below the middle of the lowest roll.
b. Drip oil smooth drip smooth is suitable for the quantitative supply of smooth oil bearing parts; the amount of oil is usually one drop every 3-8 seconds; too much oil will lead to increased bearing temperature.
c. The circulating oil is smooth and the oil is pumped to the bearing parts; the smooth oil after the bearing is filtered and cooled, and then used. Because the circulating oil can take away a certain amount of heat; the bearing is cooled; therefore, the method is suitable for bearings with higher speed. component.
d. The spray is smooth and mixed with smooth oil by a sprayer to form an oil mist; in the eruption bearing; the air flow can effectively cool the bearing and avoid the intrusion of impurities. This method is suitable for the smoothing of high-speed, high-temperature bearing components.
e. The illuminating and sliding oil pump pumps the high-pressure oil into the bearing through the nozzle; the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed; the rolling body and the cage also make the ambient air flow at a suitably high rotation speed. It is difficult to send the smooth oil to the bearing in a generally smooth manner; it is necessary to spray the smooth oil into the bearing by means of a high-pressure eruption; the nozzle should be placed between the inner ring and the middle of the cage.
(6) The solid is smooth under some special application conditions; a small amount of solid smoothing agent is involved in the smooth grease; if 3~5% of the No. 1 molybdenum disulfide can be used to reduce wear; improve the resistance to heat and heat; High vacuum, corrosion resistance, radiation resistance; and special conditions such as extremely low temperature; solid smoothing agent to participate in engineering plastics or powder metallurgy materials; can be made into bearing parts with self-smooth function; such as solid lubricant with adhesive Bonded to the raceway, cage and roll body; constitutes a smooth film; has a certain effect on reducing conflict and wear.
(7) Make up and replace a smoothing agent a. The smooth grease compensates for the interval because of the mechanical effect; the addition of aging and pollution; the smooth base filled in the bearing equipment will gradually lose its smooth function. Therefore, the smooth rank needs to be continuously compensated and updated. The composition, scale and speed of the bearing are different; the approximate interval of the smooth grease is compensated according to the operation time requirement; otherwise; when the bearing temperature exceeds 70 °C; the bearing temperature rises by 15 °C; Make up the interval to cut in half.
The double-sided closed bearing is now filled with grease at the time of manufacture; “HRB” uses the standard smooth grease in these products; the common working temperature scale and other functions are suitable for the regular occasion; and the grease filling amount also corresponds to the bearing size. The life of the fat can usually exceed the bearing life; except for special occasions; no need to make up for smooth grease.
b. Replacement cycle of smooth oil The replacement cycle of smooth oil is different depending on the application conditions and oil quantity; usually; when the working temperature is below 50 °C; when it is used in an excellent environment with less dust; replace once a year; when the oil temperature reaches At 100 ° C; replace it once every 3 months or less.

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