Timing view of the bearing

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Timing view of the bearing

Source: China Bearing Network Time: 2018-02-20
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Regular inspection of the equipment; inspection of the bearing and the removed bearing during the replacement of the external parts; reviewing whether the re-use or application of the situation is better or worse. Carefully inquire and record the removed bearing and appearance; In order to clarify and query the remaining amount of smoothing agent; sample the future; to remove the bearing well.
Secondly, check the raceway surface; the situation of the rolling surface and the cooperation surface, and the wear and tear of the frame, etc., whether there is damage or abnormality.
Determine whether the bearing can be used again; consider the degree of bearing damage; machine function, importance, operating conditions, viewing cycle, etc. to review the results in the future. Check the results; if the bearing is found to be damaged and abnormal; the contents of the injury section are identified Reasons; formulate countermeasures. Others; view the results; if there are several disadvantages; the bearings can no longer be used; the need to replace the new bearings.
a. The inner and outer rings, the rolling body, and any one of them have cracks and fragments.
b. The inner and outer rings and the rolling body are stripped.
c. 1. The raceway surface, ribs and roll body have obvious card injuries.
d. 3. The wear of the frame is severe or the rivets are loose and fierce.
e. The raceway surface, the rolling body is rusty and flawed.
f. There are obvious indentations and marks on the rolling surface and the rolling body.
g. Creep on the inner diameter of the inner ring or the outer diameter of the outer ring.
h. Overheating discoloration is fierce.
i. Smooth grease seal bearing seals and dust cover damage is severe.
1. In the operation, the inspection items in the fault handling operation have the rolling sound, oscillation, temperature and smooth condition of the bearing; the specific conditions are as follows:
1. The rolling sound of the bearing is selected by the sounder to check the size and sound quality of the rolling sound of the bearing in the operation; even if the bearing has slight peeling and other damage, it will announce abnormal sounds and irregular sounds; .
2, the bearing oscillation of the oscillation of the bearing is very sensitive to the damage of the bearing; for example, shedding, indentation, corrosion, cracks, 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.
3, 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; it will show abnormal high temperature; 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 prevented.
4, smooth (1), the smooth effect of the bearing smooth on the fatigue life of the rolling bearing and conflict, wear, temperature rise, oscillation, etc. have an important impact; there is no normal smooth; the bearing can not work. Analyze the cause of bearing damage; About 40% of bearing damage 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 and other effects; the smooth bearing effect 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 selected to be smooth; it can prevent foreign matter such as dust from entering the bearing;
d. Smoothing agents have the effect of preventing 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 kinds of grease smooth and oil smooth. In order to give full play to the function of the bearing; the important thing is 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), smooth and smooth grease is a smoothing agent composed of base oil; thickener and additives. When selecting; should choose the grease that is very suitable for the bearing application conditions; because the trademark is not the same; in terms of function will also There is a big difference; 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 fat, lithium-based smooth fat, aluminum-based smooth fat and two Molybdenum sulfide 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), the selection of smooth grease according to the operating temperature to select smooth grease; the primary goal should be the dropping point; oxidation stability and low temperature function; the dropping point can usually be used to evaluate the high temperature function; the bearing practice temperature should be lower than the 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, the penetration is small. Outside; also have higher oil film strength and extreme pressure function. When selecting smooth grease according to environmental conditions; calcium-based smooth fat is not easily soluble in water; suitable for dry and less watery environment.
5, the oil is smooth under the conditions of high speed and high temperature; when the grease is smooth, it can be used with smooth oil. After smooth oil circulation; can take away a lot of heat. Viscosity is an important characteristic of smooth oil; the thickness of viscosity directly affects smooth oil The fluidity and the thickness of the oil film formed by the conflicting surface; the viscosity of the smooth oil at the bearing operating temperature is usually 12-15 cst. The higher the rotational speed, the lower the viscosity should be selected; the heavier the load, the higher the viscosity should be selected. The commonly used smooth oil has machinery. Oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil, etc.
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. Smooth dripping oil is suitable for the quantitative supply of smooth oil to the bearing components; the amount of dripping is usually one drop every 3-8 seconds; too much oil will cause the bearing temperature to increase.
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 prevent 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 holding frame 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 holder.
6, the solid smooth under some special operating conditions; a small amount of solid smoothing agent to participate in smooth grease; such as 3 to 5% of the No. 1 molybdenum disulfide can reduce wear; improve resistance to heat and heat; about high temperature, elegant, 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; It is formed on the raceway, the support frame and the roll body; it forms a smooth film; it has a certain effect on reducing conflict and wear.
7, the smoothing agent to make up and replace
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 half of the interval. The double-sided closed bearing is now loaded with grease; "HRB" uses the standard smooth grease in these products; the common operating temperature scale and other functions are suitable for the regular occasion; The amount also corresponds to the size of the bearing; the life of the grease 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.
It is very important to observe the timing of the bearing seal. It is very important to keep the bearing in the best condition. The most favorable viewing time is to arrange it at the time of the scheduled stop; the pre-existing plan and the Xinxuan bearing bearing and the bearing surface are usually Yes and help to view assignments.
The importance of a clean shaft:
a. It is very important to adhere to the bearing and smooth cleanliness.
b. Before the inspection, the external appearance of the machine should be taken; then the parts around the bearing are removed. The oil seal is a very weak part; therefore, it must be taken care of; do not apply excessive force; then carefully look at the oil seal and its surrounding parts; if it has been presented When the performance is bad; it must be replaced; a bad oil seal will cause damage to the bearing and a strict equipment stop.
c. Check that the smoothing agent is stained with a little smoothing agent between the two fingers; if there is a contaminant, feel it; or apply a thin layer of smoothing agent on the back of the hand; then seal it.
d. Replace the smoothing agent oil smooth bearing after the old oil is drained; if possible; refill the fresh oil and let the machine rotate at low speed for a few minutes. Try to get the oil to collect the residual contaminants; then drain the oil The oil is best filtered before use. The grease smoother bearing should be used in the replacement of grease to prevent any joint with cotton to the bearing; because these residual fibers can be wedged Into the between the rolling elements and the formation of damage; especially the use of small bearings need to pay attention to this problem.
f. Cover the exposed bearings to see the bearings; do not expose the bearings to contaminants or moisture. If the operation is stopped, the machine should be covered with oil-paper plastic sheets or similar materials.
If the unshielded bearing is removed without being disassembled and can be viewed; remove it with a white spirit; apply it with a lint-free cloth or blow it with tight air. Dry (pay attention not to let the bearing assembly start to rotate).
Use a small mirror and a probe used by a similar dentist to view the track surface of the bearing, the holder and the beads. If the bearing is not damaged, it should be based on the smooth explanation provided by the original machine or on pages 204 to 247 of this book. The claim is fulfilled again.
It is not necessary to remove the bearing with the sealing cover or dustproof, only scrub the external appearance. If the bearing is damaged, it needs to be replaced. The replacement of the bearing during the timed protection period is far better than that due to the damage of the array. It’s more economical to lose it.
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