Raceway delamination, we must first make the right judgment. Delamination appears, usually in the external hard to see. According to our experience, the following occurs when the roller stripped layers: the host load rotation, the raceway at a slightly - slightly "abnormal sound, uneven rotation speed or a position has slowed significantly and accompanied by slight vibration; rotary motor temperature is too high or too much current; bad motor and hydraulic rotary coupling or coupling, etc. keyway squeezed.

 
Delamination appears, it must be repaired promptly. Otherwise, delamination area will be expanded to the entire slewing bearing scrap.
 
The repair methods are: first slewing roller or ball inside out, so that the separation of inner and outer rings; re-use gasoline to clean raceway; grinder (wheel) and then carefully Microsoft needle delamination area has generated around the crack of the hardened layer rubbed off the bottom of the delamination is bald; raceway requires welding with welding and cutting torch to preheat the carbon steel electrode welding (welding rod use to be drying, and with the drying with the use), to make the solder layer slightly above the raceway surface of 1-2mm; delamination deeper or larger should be stratified piecewise welding, do not make the base metal temperature is too high and lead to deformation; avoid rapid cooling to produce cracks, insulation measures should be taken immediately after the welding, so that he gradually cooled. After cooling, the grinder polished welding layer, making it slightly above the surface of the raceway, the oil stone or metallographic emery cloth gradually grinding the welding layer table, to make it highly consistent with the normal surface of the raceway, with the corresponding original curvature model testing, coated with grease until the qualifying date; use gasoline to clean the roller and the roller (ball) to complete the assembly into one.
 
According to the above method to facilitate the tower crane and other equipment rotary ring bearing raceway, long-term work normally.



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