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Bearing maintenance techniques for complex problems are two: When oil and how much oil should be changed. If too little oil, the bearings will be early retirement; if too much oil, the bearings will be in trouble or long-term harm power coil and wire.
Traditionally, lubrication program is based on the time given. Equipment suppliers often lubricated according to the operation time to develop plans. Also, equipment suppliers in the course of their regular maintenance program for the amount of oil added guidance. For the staff, the short-term replacement of oil is a very common thing, and is often added grease ones. If officers are required every two to three weeks to replace oil, every time you add an ounce of grease. These recommendations led to the outset that they are no practical significance in some unknown factors of the set up.
Lubrication intervals have a simple premise: the bearing does not collapse due to dry and stop the conditions to maintain a reasonable device operation. This is a fixed concept of prevention. However, we must maintain a large number of excessive thirst and lubrication lubrication balance.
To achieve the goal of optimizing the device, we'd know when to stop and when to lubricate the bearings refueling. Through lubrication under conditions of strategies can be developed to achieve this goal. Simply put, bearing conditions determine when the oil change. When the bearing running smoothly and there is no indication that the bearing changes, lubrication should be avoided, it functioning; if conditions change or display the desired bearing lubrication, then you should use lubricant. Detection bearings, oil change can help us determine the amount of lubrication and when to stop adding oil.
Ultrasound technology is ideal for an effective way according to the conditions of lubrication. Want to understand why, we must understand the ultrasonic technology, bearing how to generate ultrasound, and ultrasonic testing equipment is helping us maintain optimum lubrication of the bearing strength.
Ultrasound technology is based on the high-frequency sound sensor to the measurement. Ultrasonic 20,000 revolutions per minute laps or 20,000 Hz. Taking into account the frequency when people stop hearing high-frequency ultrasound has just begun. Most of the ultrasonic instrument can sense 20KHZ to 100KHZ. And people's hearing range, but only from 20HZ to 20KHZ. Highest average people often hear 16.5KHZ or some more.
Ultrasound equipment
Structural framework based on ultrasonic technology is the ultrasound transducer device. They passed Heterodyning technology inaudible high-frequency sounds in electronic form, switch to the human ear can hear the see the range. This heterodyning technique is like an AM radio works as simple. When we listen to the radio, we can not hear the sound of the radio waves, but this way you can help us to easily identify the different voices and musical instruments.
Briefly, this technique provides an accurate process of the ultrasonic conversion, the sound operation of the device will convert the user can immediately identify the sound so that it can distinguish the sound of different components. Most ultrasonic transducer feedback sound in two ways: through the audio or voice through a measuring instrument to expand or enhance the sound reaches a certain decibel, people can hear it.
Ultrasonic Monitor
Suppose there is a station installed bearings. Reasonable arrangements adding the appropriate amount of lubricating oil. According to the track when it is running, it will be subject to any pressure being decomposed oil, which is without any pressure. If this is the case, the sound generated by the bearing flat tire as the same sound. We call this sound as "white noise." This noise includes a variety of voices, high and low frequencies. High-frequency sound waves more easily recognizable than the lower frequencies. With the ultrasonic converters, these signals can be identified out mechanical noise issued from other components by a small amount of contamination or pollution, such as tool adjacent bearing rod or the sound. (Relative to the moving element vibration detecting vibration meter, ultrasonic converters will detect the friction.)
When the bearing lubrication strength failure or deterioration, will increase the potential for friction. You will notice or hear gas intensity ultrasound PA also increased correspondingly. Decide when to stop oiling lubrication and when the way is very simple: to develop a baseline to develop observation and oiling the time schedule for monitoring.
To develop a baseline
Bearing base line reflects the normal operation, no visible errors, sufficient lubrication conditions decibel. To develop a baseline of three ways:
1 comparison: If the same type of a plurality of bearings, these bearings can be compared together. Using the same test method, or from the same perspective of each of the bearings. Analysis decibel intensity and sound quality. If there is no essential difference (less than 8 db), we can set it on the basis of each one bearing decibel intensity.
(2) add the oil, when setting the base line: When adding oil when listening to the sound intensity, when the sound intensity decreased and then increased. At this time, do not add too much oil, and the set it to baseline.
3 History: observation bearing decibel intensity recorded daily for 30 days and then compare the results recorded. If the decibel intensity change with little or no change (less than 8 db), we can put this to the baseline, and observe the results for future comparison value.
Set observation schedule
As with the production, environmental results, the operating results of associated equipment is selected and set critical assessment of the mechanical system of the main factors. When the base line was observed after the enactment tested once a month is necessary. For those who want a high-decibel lubricated bearings, the frequency should be detected more frequently, so that it can be observed that the changes that may occur. If a bearing is going to destroy the state, then the oil can only temporarily cover up mistakes. However, the decibel intensity will soon be elevated to display an error exists. In some cases, this phenomenon is apparent within a few minutes, while others take several days.
Lubrication detection
If a bearing dB over baseline 8 db, we believe that this needs to be lubricated bearings. When we realized that the bearings require lubrication, then know when to stop oiling will prevent excessive lubrication appears. Can be done according to the following three steps:
1 to bearing manufacturers is calculated based on the amount of guidance, and then injected into oil, not too much. This step is very subjective, and ultrasonic independent and never fail over this step.
2 When injected lubricant lubrication technician ultrasonic detection equipment bearings. Oiling down slowly until the decibel intensity baseline.
3 If no base line as a guide, the amount of oil to be reduced after the sound stops rising. At this time, technicians should discontinue the use of lubricants.
Ultrasonic inspection of bearings
Ultrasonic inspection or monitoring bearing damage is discovered early (the beginning of) the most reliable way. When the temperature rises or low-frequency vibration intensity strengthened when the ultrasonic warning will be the first ring. When the bearing is damaged due to excessive use of the initial lack of excessive oil or lubricating oil, the use of such inspections bearing is very useful.
Find a signal failure
Like the metal on the same track ball bearings or spherical roller bearings, such as the use of excessive start occurs when slight deformation. This situation will produce irregular surface, resulting in increased distribution of the ultrasonic waves. Obtained from the initial readings indicate changes in the amplitude of one to two conditions: Early failure or lack of lubrication and early bearing failure. If the ultrasound over baseline eight db, it will have a continuing impact associated with noise, which indicates that lubricant failure (dry bearing surfaces). If the ultrasound readings than expected readings, up to 12 dB, there will be the collapse of noise, which can be assumed to have entered the bearing failure mode.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7206BDB NSK | 30 | 62 | 16 |
| 7206ADB NSK | 30 | 62 | 16 |