Compared with sliding bearing, the rolling bearing has many advantages, in which one of the most important is to reduce the operation friction loss, and its service life has much more improve than that of sliding bearing. Therefore, mostly crusher machine adopt the rolling bearing at present. Rolling bearing no need to maintain basically and should be adopted in the relevant position.
1．Crusher rolling bearing assembly
(1) The service life of rolling bearing depends on the assembly method and assembly quality. Incorrect bearing assembly easy to produce many kinds of defects, such as ball grain surface spalling, scratches, dents, forming cracks, wear severely and has a high temperature, even damaged quickly. So the correct assembly and improving the quality have an extremely important role for extending the service life of rolling bearing.
(2) Rolling bearing assembly selects the mating dimension of the shaft and bearing housing based on the inner and outer diameter of the bearing. The inner sleeve of rolling bearing mating with the shaft adopt the matching standard of basic hole system, and the outer sleeve mating with bearing housing adopt the matching standard of basic shaft system. The shaft and bearing housing should be processed according to this requirements, which will meet all the cooperation.
(3) Take consideration of the load, direction, bearing installation method, working temperature, bearing type and working condition etc. when assemble bearing. Assembly of rolling bearing adopts level two precision, rolling bearing in precision equipment normally adopts level one precision, seldom uses level three.
(4) Assembling of rolling bearing should ensure uniform abrasion of inner sleeve and outer sleeve of bearing and easy to disassemble. When choose fit tolerance, should not use large interference to prevent expansion or compression of inner and out sleeve thus blocking the normal rotation of ball. Therefore, we should choose the right fit and tolerance between bearing and shaft as well as bearing base according to the machining precision.
(5) Clean rolling bearing before assembly, check shaft neck and bearing base, and measure each dimension.
2. The adjustment of crusher roller bearing
Crusher rolling bearing should be adjusted or replaced,if following defects found in operation,
(1) Fatigue damage is the main destroy mode for rolling bearing under alternate loading over a long period of time.
(2) Due to the inferior quality of lubrication materials, or because of poor bearing sealing, dust come into working surface, cause corrosion and the oxide layer with a black spots in the early time, then form rust layer and peels off.
(3) Pits come on the surface of the rolling elements,or there is too much noise in operation which is unable to adjust.
(4) Bearing surface cracks caused by improper assembling or maintenance.
(5) Bearing overheating leads to annealing.
Rolling bearing damage repair is limited for its complex structure and high precise, replace rolling bearing after wear or damage.