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Ultrasonic selection according to different bearings
Source: China Bearing Network Time: 2018-06-11
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Traditionally, the sleek solution is based on time. The equipment supplier generally formulates a sleek solution based on the operating time. Moreover, the equipment supplier often participates in the coaching of the amount of smooth oil in the course of their repair plan. Said; short-term replacement of smooth oil right or wrong often seen; and often added more smooth grease. For example; demand workers replace the smooth oil every two to three weeks; add one ounce of smooth grease each time. These propositions start Inciting them to be established on some uninformed elements without any practical significance.
There is a simple condition for the smooth moment distance: the proper operation of the equipment is carried out under the condition that the bearing is not suspended due to boring and collapsing. This is a fixed avoidance concept. However, it is necessary to insist on smooth hunger and a lot of excessive smoothness. The balance between.
In order to reach the equipment optimization policy; we know best what time is smooth and what time to stop to refuel the bearing. After the smooth strategy based on the conditions can reach this intention. Briefly; the condition of the bearing determines what time to change the oil. When the bearing works smoothly and there is no trace to indicate the change of the bearing; avoid smoothness; let it work normally, if the condition changes or the bearing shows a smooth demand; then you should use smooth oil. Detect the bearing; replace the smooth oil to help us to add The amount of smooth oil and what time to stop adding oil.
Ultrasonic skills are a versatile and versatile method of ambition. I want to understand why; we need to know the ultrasonic skills; how the bearings attack ultrasound; and how the ultrasonic testing equipment helps us to protect the best smooth strength on the bearings.
Ultrasonic skills are measured by high-frequency acoustic induction. Ultrasound rotates 20,000 cycles per minute or 20,000 Hz. Considering that high-frequency ultrasound is just beginning when everyone's hearing frequency is aborted. Most ultrasonic instruments can sense From 20KHZ to 100KHZ. The hearing scale of everyone is only from 20HZ to 20KHZ. Evenly, everyone can often hear 16.5KHZ or more.
Ultrasonic instruments are based on the ultrasonic structure of the layout structure. They refer to ultrasonic transducers. They use Heterodyning skills to electronically change the high-frequency sounds that are inaudible to the human ear to the scale of the human ear. This kind of heterodyning skills The operation principle of the AM like the radio is the same. When we listen to the radio; we can't hear the sound of the radio sound; but this method can help us easily distinguish between different sounds and musical instruments.
Briefly; this skill process provides an accurate ultrasonic transformation function; it transforms the sound announced by the operating device into a sound that the user can immediately distinguish; thus, it is possible to distinguish the sounds declared by different components. Most The ultrasonic transducer responds to the sound in two ways: after the sound is amplified by the sound or by the measuring instrument, the sound is enhanced or reaches a certain decibel; you can hear it.
The ultrasonic monitor assumes that there is a mounted bearing. Under the reasonable arrangement, participate in the appropriate amount of smooth oil. When it is working according to the trajectory; any pressure it is subjected to is decomposed by the smooth oil; that is, there is no Pressure. If this is the case; the sound of the bearing is the same as the sound of the tire leaking. Let's call this sound "white noise". This noise contains various sounds; the bump frequency is not the same. The high frequency sound wave ratio is low. The frequency is more easily identified. With ultrasonic transducers; these signals can be distinguished; they are not contaminated by other components or are contaminated by minors; such as sounds declared by rods or nearby bearings. (Related to detecting moving parts A sensational sensation meter; the ultrasound transducer will detect conflicts.)
When the bearing smooth strength fails or becomes entangled; the potential of the conflict will be added. You will notice or hear the intensity of the ultrasonic amplified gas will be added accordingly. The resolution of what time is smooth and what time to stop the oil injection is very simple: 4. Develop a bottom line, prepare a survey plan, and monitor the time of oil injection.
The bottom line of a bottom line bearing is proposed to be reflected in normal operation; no visual fault; the decibel strength under smooth conditions is met. Three ways to draw the bottom line are:
1. Analog method: If there are multiple bearings of the same type; these bearings can be placed on a year-on-year basis. Use the same test method or investigate each bearing from the same viewpoint. Analyze the decibel strength and sound quality. If there is no essential difference (less than 8 decibels); we can set it to the base decibel strength of each bearing.
2. When adding smooth oil, set the bottom line: when adding smooth oil; listen to the intensity of the sound; when the sound intensity drops and then rise again. At this time; do not add too much smooth oil; and set it as the bottom line.
3. Historical records: investigate the bearing decibel strength; record daily; then compare the results recorded for 30 days. If the decibel strength changes little or no change (less than 8 decibels); we can set this as the bottom line; and for future investigation results Comparable value.
Setting the survey timetable, such as the equipment criticality associated with total production, environmental results, and operational results, is the main factor in selecting and setting up the evaluation mechanical system. When the root survey line is drafted; it is often necessary to test the right and wrong once a month. To smooth the high-decibel bearing; the frequency should be detected more frequently; this will be able to investigate the changes it may have. If a bearing is about to be destroyed, then the smooth oil can only temporarily cover the fault. However, the decibel strength will be very It rises quickly to show the existence of fault. In some cases, this appearance will appear in a few minutes; while others will take several days.
When it is smooth, if the decibel of a bearing exceeds the bottom line by 8 decibels; we think that the bearing demand is smooth. When we realize that the bearing needs are smooth; then knowing what time to stop the oil injection will avoid excessive smoothness. It can follow the following three steps. end:
1. Calculate the dosage based on the guidance of the bearing manufacturer; then write the smooth oil; don't overdo it. This process is wrong and one-sided; it has nothing to do with ultrasound; and this process has never failed.
2. When writing smooth oil, the smooth technician uses the ultrasonic instrument to detect the bearing. Gradually fill the oil until the decibel strength drops to the bottom line.
3. If there is no bottom line for counseling; the amount of smooth oil should be stopped when the sound drops and then rises. At this time; the skill should stop using smooth oil.
Ultrasonic bearing observation Ultrasonic observation or monitoring is the most reliable way to detect the initial (most beginning) of bearing damage. When the temperature rises or the sensation intensity of low frequency is strengthened, the ultrasonic wave will be the first to sound. When the bearing is damaged due to overuse When using short oil or smooth oil, it is useful to use this method of observing the bearing.
The signal that detects the loss is like the spherical bearing with the same metal on the trajectory; if the beginning of the roller or ball bearing is over-utilized, it will have a slender deformation. This will cause an irregular appearance; then the ultrasonic wave will be added. The changes in the amplitude obtained from the initial readings indicate one or two cases: early loss or shortness of smooth oil and initial bearing failure. If the ultrasonic wave exceeds the bottom line by eight decibels; there will be continued impact noise; this noise Indicates that the smooth oil is lost (dull bearing appearance). If the ultrasonic reading exceeds the expected reading; when it reaches 12 decibels, there will be broken noise; this noise can be assumed that the bearing is now beginning to enter the lost form.
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