How should oil-free bearings be cleaned and inspected

               
Update: 15-10-2021
               
Abst:

When removing the oil-free bearing for inspection, firs […]

When removing the oil-free bearing for inspection, first make a record of its appearance by photographing and other methods. In addition, recognize the amount of remaining smoothing agent and sample the smoothing agent, and then wash the oil-free bearings.

a. During fine washing, gradually roll over the oil-free bearing in oil, which must be carried out carefully. The commonly used scrubbing agent is neutral non-water-containing diesel or kerosene, and occasionally warm lye is used according to the demand. No matter what kind of cleaning agent is used, it must be filtered and kept clean. After washing, immediately apply anti-rust oil or anti-rust grease on the oil-free bearing.

b. When rough washing, use a brush on the top of the oil to remove smoothing grease or adhesions. If the oil-free bearing is rolled in oil at this moment, the rolling surface may be damaged by foreign objects.

c. The washing of the oil-free bearing is divided into rough washing and fine washing, and a metal grid can be placed at the bottom of the application container.

Pay attention to the key

From an application point of view, to ensure that oil-free bearings can reliably perform homework, we must pay attention to the following points:

Improve smoothing quality, control oil pressure, temperature and flow, and strengthen oil filtration. Control the temperature of the diesel generator set, and the homework will be unfavorable in the case of over-cooling or over-heating. In cold weather, the diesel engine should be warmed up before starting, and the crankshaft should be rolled by hand to make the oil enter the friction surface. The appearance quality and geometry of oil-free bearings and journals should be strictly guaranteed. Use fuel and smoothing oil that meet the regulations. The spare time of oil-free bearings should be appropriate. If the generator set is too large, it will produce a charge.

1. Choose fuel and smoothing oil that meet the regulations.

2. The appearance quality and geometry of oil-free bearings and journals should be strictly guaranteed;

3. The leisure time of the oil-free bearing should be appropriate. If it is too large, it will cause a charge, if it is too small, it will be poorly smooth and may burn tiles;

4. Improve smoothing quality, control oil pressure, temperature and flow, and strengthen oil filtration;

Inspection and identification

The inspection results can be distinguished by those who are used to oil-free bearings or know about oil-free bearings. The identification specifications vary according to the mechanical performance, importance, and inspection cycle. If there is the following violation, the oil-free bearing must be replaced. 1) Cracks and shortcomings of oil-free bearing parts. 2) The peeling of the rolling surface of the raceway surface.

In order to identify whether the removed oil-free bearing can be used from scratch, it is necessary to focus on checking its standard accuracy, rotation accuracy, internal clearance and cooperation surface, raceway surface, retainer and seal ring. Because large oil-free bearings cannot be rotated by hand, pay attention to check the appearance of the rolling body, raceway surface, retainer, rib surface, etc. The higher the importance of oil-free bearings, the more robust they must be inspected.

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