Two complex problems related to bearing maintenance technology is: When oil and how much oil should be change. If too little oil, the bearings will be early retirement; the oil too much, the bearing will be in trouble or long-term damage to the power coil and reel.
Traditionally, the lubrication plan is scheduled. Equipment suppliers usually depending on the operating time to develop the lubrication plan. And equipment suppliers in the course of their maintenance program, often the amount of the lubricating oil by adding guidance. Staff for short-term replacement of oil is a very common thing, and often added to grease the high side. Require staff every two to three weeks to replace a lubricant every time you add an ounce of grease. These recommendations are a beginning cause they are built up in the absence of any practical significance do not know the factors.
Lubrication intervals on a simple premise: to maintain a reasonable operation of the equipment in the bearing does not stop running due to dry and collapse conditions. This is a fixed concept of prevention. However, we must maintain the balance between the lubrication thirst and excessive lubrication.
In order to achieve the goal of equipment optimization, we had better know when lubrication as well as when to stop fuel to the bearing. This can be achieved through the development of lubrication strategies under the conditions. Simply put, bearing conditions determine when oil. When the bearing is running smoothly and no indication that the bearing is changed, should be avoided lubrication, it is normal operation; if conditions change or bearing to show the need for lubrication, then you should use a lubricant. Detection of bearing, lubricant replacement can help we have decided to add the amount of the lubricating oil and when to stop to add oil.
Ultrasonic technology is ideal for an effective way according to the conditions of lubrication. Want to understand why, we must understand the ultrasonic technology, bearings how to generate the ultrasound, and ultrasonic testing equipment to help maintain optimum lubrication on the bearing strength.
Ultrasonic technology to measure the induction of high frequency sound. Ultrasonic revolutions per minute circle 20,000 or 20,000 Hz. Take into account when people's hearing frequency stop high-frequency ultrasound has just begun. Most of the ultrasound equipment can be sensitive to 20KHZ to 100KHZ. People's hearing range, but only from 20HZ to 20KHZ. Average people often can hear up to 16.5KHZ or a few more.
Ultrasonic instrument
The instrument is based on the structural framework of ultrasonic technology ultrasonic converter. Ears but not the high-frequency sound through Heterodyning technology converted to electronic form to see the scope of the human ear can hear. As simple as this heterodyning technology works like radio AM. When we listen to the radio, we can not hear the radio acoustic sound, but in this way can help us easily identify the different voices and musical instruments.
Simply put, this process provides a precise ultrasonic conversion function, the sound of it will operate the equipment to convert the user can immediately identify the sound, so that you can distinguish the sound of different components. Most of the ultrasonic converter feedback sound in two ways: by sound or by the measuring instrument to expand the sound, sound enhancement or reach a certain decibel, people can hear.
Ultrasonic detectors
Suppose you have an installed bearing. By adding the appropriate amount of lubricant in a reasonable arrangement. When it according to the orbit, it is subject to any pressure lubricants broken down, that is, no pressure. If this is the case, the bearings produced by the voice like the sound of a flat tire. We call this sound "white noise". This noise includes a variety of voice, high and low frequency. High-frequency sound waves more easily than low frequency identification. With ultrasonic converter, these signals can be to identify them, are not issued by the other components of mechanical noise pollution or a small amount of pollution, such as the tool rod or adjacent bearing the sound. (Relative to the detection of moving parts vibration of the vibration meter, ultrasonic converter will detect friction.)
When a potential bearing lubrication strength failure or deterioration, friction will increase. You will notice or hear the intensity of the ultrasonic PA gas will increase. Decide when lubrication as well as when to stop oiling is very simple: to develop a baseline to develop the monitor when the observation schedule and oiling.
To develop a baseline
Bearing base line reflected in the normal operation, no video error, the decibel intensity sufficient lubrication conditions. To establish the baseline of three ways:
Comparative Law: If there is more of the same type of bearings, these bearings can be compared together. Using the same test method or from the same angle to look at each bearing. Analysis of the intensity in decibels and sound quality. If there is no essential difference (less than 8 dB), we can set it to each one bearing the basis of decibel intensity.
(2) the lubrication when setting the baseline: when the lubricant is added, listening to the sound intensity and sound intensity decreased and then increased. At this time, do not add too much oil, and set it as the baseline.
History: To observe the bearing dB intensity was recorded every day, and then record the results of comparison of 30 days. If the decibel intensity change little or no change (less than 8 dB), we can put this set to the baseline, and for later comparison value of the observed results.
Set up observation schedules
Such as gross domestic product, environmental results, the operating results related to the device key is to choose and set up the assessment of mechanical systems. When the basis of observed line after the enactment of the month detection time is necessary. To lubricate high-decibel bearings should be the frequency of detection is more frequent, so you can observe its possible changes. If a bearing is to be destroyed by the state, then the oil can only temporarily mask the error. However, the db strength will soon be increased to show the error exists. In some cases, this phenomenon within a few minutes will be apparent, while others take a few days.
Lubrication detected
If a bearing dB more than the baseline 8 db, we believe that the bearings need lubrication. When we realized that the bearings need lubrication, then know when to stop oiling will prevent over-lubrication. Follow these three steps to complete:
1 to the guidance of the bearing manufacturer's calculated on the basis of usage, and then injected into the lubricating oil, not too much. This step is very subjective, and has nothing to do with the ultrasound, and this step is never failure.
When injecting grease lubrication technician using ultrasonic detection equipment bearings. Slowly oiling until the decibel intensity dropped to baseline.
(3) If there is no baseline as a guide, the amount of the lubricant should be in the voice dropped and then rose to stop. At this time, the technician should cease to continue to use lubricants.
Ultrasonic bearing inspection
Ultrasonic inspection or monitoring find that bearing damage early (the beginning) the most reliable way. When the temperature or low frequency vibration intensity strengthen, ultrasonic warning will be the first ring. Bearing when the bearing due to the use of excessive damage early, the lack of excess lubricating oil or lubricating oil, the use of such inspections is very useful.
Found that the failure signal
Like a metal ball bearing track, such as roller or ball bearings, excessive use occurs slightly deformed. This situation will produce irregular surface, resulting in the dissemination of ultrasound to increase. The amplitude of the change from the initial reading that one to two conditions: early failures or lack of lubricant and early bearing failure. If the ultrasound is more than eight db baseline, accompanied by the continued impact of noise, the noise that the lubricant failed bearing surface (dry). If the ultrasound readings more than expected readings, 12 db is reached, there will be a collapse of the noise, this noise can be assumed to have entered for the bearing failure mode.


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