Bearing temperature 95

I’d like to ask how to measure the top clearance: by lifting the shaft, taking measurements, or using a lead wire? Every measurement method has its errors. Based on what you’ve described, it seems that the replacement tiles need to be swapped out. If there’s a difference of 10 microns, first verify whether the measurement data and methods are correct, as such a large difference is not normal under normal circumstances ； If that is indeed the case, then the gap needs to be adjusted to the design value. There are adjustment shims behind the tilting pads, which can be used for this purpose. The sizes of these pads vary quite significantly; it is recommended that you use measurement and calculation methods to adjust all the pads to the same size ； The oil wedge can be adjusted slightly to increase the contact area between the grinding pad and the shaft. It is recommended not to scrape the pad directly; it’s best not to scrape the tilting pad blocks either, and only minor adjustments can be made to the higher areas.

This post was last edited by unknown_LNJJ on 2017-11-1 at 16:33. The gap is created by pressing in lead, so there should be no issues with measurement. This tilting bearing tile does not have any adjustment shims; it relies on its spherical surface at the back to make contact with the bearing housing. There are positioning shafts on both sides of the bearing tile, allowing it to rotate around these shafts. Can it be tilted? I’ve never done this before; I’d like some advice: handshake

I can basically understand the current condition of the machine’s bearings. Since there shouldn’t have been high temperatures in the bearing shells before the maintenance, it’s best not to make any changes to the oil inlet and outlet holes. Instead, it’s better to grind the bearing shells. This is a technical task, so it’s necessary to find an experienced fitter. Tools such as an external diameter micrometer, vise grips, grinding tools, sandpaper, cleaning oil, and red lead are required. Before starting the grinding process, measure the thickness of the bearing shells first; during the grinding process, the shells will be ground against the shaft to ensure proper contact area. Once the shells are properly ground, their middle surfaces should be in contact with each other, while the area near the oil wedge should have a lighter color due to the red lead, with almost no red lead present in that area. If the fitter is experienced at grinding bearing shells, he’ll know exactly what to do. It’s a minor issue. If the fitter lacks experience, it’s advisable to handle only a small portion of the shells at a time, to prevent the gap from becoming too large. Given that the gap might become too large, it’s better to treat all five bearing shells to ensure that their centers align with the center of the bearing.

I’m sorry I just saw it. Generally, bearing shells are adjusted using the shaft-lifting method, as multiplying by a coefficient is required for the lead wires, and the location is near the highest point of the level blocks; this method is not easy to use. It is recommended that you install two gauges right above the bearing and near the shaft journal where it meets the bearing shell. By lifting the shaft and calculating the difference, you can determine the bearing clearance. You can use this method to see how much the value differs from the design value; if it’s similar, it’s possible that there is poor contact between the surface of your spare bearing shell and the other components

During maintenance, a flat surface should be used to inspect the tilting pad blocks; each block must be checked to ensure that the thickness difference between them does not exceed 0.01 mm. If the deviation is too large, the pads need to be ground or the bearing must be replaced! Another reason is that the clearance measured by the poster is not within the technical specifications. Overheating of the bearing can be caused by axial or radial factors, and a comprehensive consideration is required!

I’ve never shingled before; it seems pretty simple from the description. If I tried to do it myself, I’d definitely ruin a set of shingles. What kind of scraper is best for scraping this type of tile? I’ve heard that some people use metallographic sandpaper on a shaft and then grind the tiles against it, claiming that this helps to ensure concentricity. I’m not sure if that’s true.

Gather more experience now, and implement it during the next major overhaul

The clearance of the tilting bearings is too small; it might be advisable to replace the shaft bearings rather than the tilting bearings. I’ve never heard of such a thing as \"replacing\" tilting bearings – it’s impossible to make all five bearings identical.

There are indeed few people who can grind turbine blades properly, and nowadays, few young fitters in manufacturing plants know how to do this task. Most turbines that require blade grinding are those from the past; only experienced craftsmen still have work to do in this area. These days, the precision of blade processing is guaranteed! Previously, when I was at a site in Inner Mongolia, I used foreign-made tilting pad bearings. Since there were no spare parts available, it was necessary to scrape the pads and then use shims to equalize the thickness of all the pads. It seems simple, but the precision required is very high