Questions about bearings
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The question arises again: The bearing in the image is the top bearing of the company’s vertical screw vacuum pump; its model is 6208Z, with the letter Z indicating that one side of the bearing is equipped with a dust cover (a non-friction seal). After the equipment is installed, the manufacturer adjusts it according to the condition of the bearings shown in the diagram; after starting it for a few seconds, there is a loud noise and the system shuts down due to excessive current. I suspect it’s due to the bearings not having lubricant, which causes high friction, but the manufacturer believes it’s because of the low temperature (around minus 8 degrees), which makes the lubricant more viscous. I’m skeptical; after the manufacturer left, we removed the dust cover, and there was indeed a layer of white grease on the bearing balls (we rushed to fix the problem and didn’t take any photos) ； We cleaned off that excess grease, added lubricant again, and started the machine; there was no overcurrent, and the sound was normal. After running for about ten minutes, it was shut down. Here’s the question: 1. Is the grease inside the bearing lubricating grease after removing the dust cover? I insist it’s not; it’s rust preventive oil, but the manufacturer says it’s grease. 2. For bearings with dust covers, should the dust covers be removed during operation? What are the consequences if it isn’t removed, and what are the consequences if it is removed? All marine enthusiasts are welcome to engage in active discussions! ! There are wealth rewards! There are quite a few, after all, the New Year is approaching. Chemical Equipment and Machinery
1. According to you, the grease in question should be white lubricant; white lubricant is used in the gears of laser printers. However, their performance varies depending on the operating conditions, and the operating temperatures differ as well. It’s possible that the grease may freeze at low temperatures, leading to an overcurrent that causes the device to shut down. 2. Bearings with dust covers will not affect the operation of the equipment! Removing the dust cover may increase the risk of hard debris entering the bearing raceways, thereby causing damage to the equipment’s bearings!
1. White is indeed grease. 2. This type of bearing with a dust cover does not require lubricant to be added during its operation. If your equipment has a hole for applying lubricant to the bearing, you can remove the dust cover and apply lubricant to it regularly. If there is no such hole, the dust cover must remain in place; this helps prevent contaminants from entering the bearing and also stops the lubricant inside from leaking out, which could lead to a lack of lubrication in the bearing. Damaged bearing
The dust cover can be removed; once it’s taken off, it’s just an ordinary bearing! If a new bearing is left in place for a long time, the original lubricant will deteriorate! It’s best to refill the lubricant! The bearings of the rotor must have a certain axial clearance! During installation, the clearance between the inner and outer rings of the bearing and their mating parts should not be too large; it is generally 0.01–0.02 mm, otherwise the bearing will overheat!