Five-point inspection method to check bearing failure
Author: hongyuanTime:
The daily inspection work is to monitor the operation status of the equipment through the “five senses inspection method”, and judge and eliminate the fault in time. Generally, the five items are used to judge the rolling noise (noise), temperature, vibration, and lubrication status of the bearing during operation. HONBbearing02
The “five senses” refer to the sensation of a person’s eyes, ears, nose, hands and mouth.”Five senses the tally:” mainly in the equipment operation or before and after operation, the operation, check and run together with five senses and listening rods, hammer, some simple equipment, such as thermometer, according to the cycle and the location of a set, rely on visual, ear, nose smell, touch, taste, check and control equipment of pressure, temperature, flow rate, the condition of leakage, to fat, different sound, vibration, cracking (compromise), wear, relaxation and other elements in a way.
“Five senses spot check” method
See with eyes
According to statistics, 60% of human actions begin with “visual” perception. The scope of visual inspection is extremely wide, and various inspections can begin with visual inspection. For example, the paint on the bearing block is broken, and the joint marks on the upper and lower bearings of the bearing are misaligned. The looseness of the bearing block can be found; observe the changes in the oil level and oil color to understand whether the lubrication system is operating normally; , Dust, cracks, etc., you can observe defects in electrical components. When inspecting visually, you must make careful and careful observations. For example, when inspecting electrical cabinets, you must not only look at the panel, but also further open the cabinet door and observe from all angles. When inspecting the motor, you must not only look at the motor casing, but also You can open the end cover to observe the rectification status and spark level.
Listen with ear
Humans are quite sensitive to sound wave stimuli. The listening method mainly distinguishes the difference between abnormal sounds and normal sounds.
The impact of machinery, the damage of bearings, the occurrence of eccentricity and the rapid acceleration and deceleration of high-speed rotary machinery, a series of vibration sources can cause various parts to loosen, and produce various abnormal impact sounds or irregular noises.
Relays, contactor operation sounds, motor rotation sounds, and transformer electromagnetic sounds all have their own normal sounds. After listening to these normal sounds, it is easy to find abnormalities after comparison. In addition, some stationary devices, such as plug-in boards and connectors, do not make sound, but if you hear some kind of “cracking” sound, you should pay attention, because this is often caused by poor contact, loose screws or plugs, or current. Oversized and other abnormalities.
When you hear a strange sound, strengthen the connection with other sensations, or use a listening stick and other inspection methods to determine the abnormal part.
Smell with nose
Smell plays an important role in the “five senses check” method. The strange smell of the nose indicates that the device must be abnormal. The nasal sniff method mainly checks for abnormal odors caused by charring. For example, common electrical equipment has no strange odors, so the strange odors are easy to detect. It is either a short circuit between relays and motor coils, or burned insulation. As these situations are extremely likely to cause fires, it is necessary to quickly find out the abnormal points, and if necessary, stop processing.
Touch by hand
Tactile is closely related to sight and hearing. Hand touch is mainly to check temperature, vibration and pollution. Excessive temperature not only accelerates insulation degradation and shortens insulation life. It is also easy to cause accidents such as electric shock and burns, and the effect on the degradation of electronic circuit performance is particularly obvious.
Taste with mouth
When using the “five senses” checkpoint, the taste method is usually not used. Even when it is urgent to identify acidity or alkalinity in special occasions, it must be used with caution under the premise of ensuring no impact on the body.
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