What to do if the sliding bearing of the concrete mixer is damaged? In fact, the early damage of the sliding bearing of the mixer is more common than the burning out of the bearing, so it is very important to prevent the early damage of the sliding bearing.
Under the repeated action of cylinder pressure impact load, plastic deformation and cold work hardening will occur on the surface of sliding bearing, which will partially lose the deformation ability, gradually form stripes and expand, and then form cavities on the stressed surface with the falling off of wear debris.
In general, when pitting occurs on the bearing bush, the pitting first appears, and then gradually expands, resulting in interface cracking of the alloy layer. The crack propagates parallel to the interface until it peels off.
The main reason for the cavitation of sliding bearings is that the abrupt change of the cross-section of structural elements such as oil grooves and oil holes leads to the strong disorder of oil flow, forming bubbles in the disordered vacuum area, and then collapsing bubbles due to the pressure rise to cause cavitation erosion.
Cavitation usually occurs in the high load area of the bearing, such as the lower bearing bush of the crankshaft main bearing. The bearing outer ring is the relative rotation of the bearing in the seat hole. After the bearing passes through the outer ring, it will not only affect the heat dissipation of the bearing, but also easily cause alloy corrosion on the inner surface of the bearing, and damage the back surface of the bearing. In serious cases, it will burn the bearing. The main reasons are that the bearing is too short, the tenon is damaged, and the processing or installation does not meet the specifications.
The correct maintenance of sliding bearings is an effective way to reduce the early damage of bearings and also a reliable guarantee to prolong the service life of bearings. Therefore, in the daily maintenance and repair of the engine, attention must be paid to the appearance and shape of the alloy surface, bearing back surface, end and corner.
If there are abnormal signs or half wear, it is necessary to carefully find out the cause, take corresponding measures, improve the working conditions of the bearing, and pay attention to preventing early damage of the sliding bearing. For more information, follow our website Come on!