2013年8月5日星期一

Imported large gyratory crusher bearing failure analysis



A rack brass burning characteristics
Rack copper sleeve burnout from copper sleeve catchy (circumferential direction) began down side extension, compatible with other parts of the surface of each operation has the following characteristics:
(1) eccentric cylindrical face is not partial sets of eccentric portion (ie, the area under the thick edge of the axis of the arc on the surface), but in contrast to thin over the top, and pass gradually downward expansion, FAG Bearings
(2) a copper sleeve round rack appear before work circumferential burns to go abroad with their hearts burn marks correspond to the rack copper sleeve that is catchy. Chucierwai, FAG bearings other parts of the inner circular surface contact with each other and found no signs of wear.
(3) mounted on the eccentric sleeve comprising an eccentric inner circle of copper work surface has two bearing manufacturer surface symmetrical to each other; one side in the thickness between the top and the bottom surface side, the other side in the chip There are two sides Swage groove edge on top-down;
(4) Face gear at the bottom than the entire bottom surface contact, wear parts on the outside of the bottom plane, radial wear ring is the most wide 10-15mm or so, around the circumference 1000mm long, ring in the eccentric sleeve thick edge corresponding to the positive bottom.
According to the crusher working principle and structural characteristics, in the case of stone work, eccentric face in each case should be: in the role of detritus by moving cone axis wheel, eccentric cylindrical working surface is thick edge of the upper and lower surfaces of the arc. For structural reasons, the eccentric sleeve is designed to be inverted. Therefore, normal operation will be the weight of the entire eccentric bottom surface of the support by the rotation of the large gear, large gear whole area of ​​the bottom plane should have a relative movement traces.
After analysis and comparison, can be considered the primary crusher eccentric hole in the side mountings are not running in a vertical state, but there is a tilt angle, tilt direction is eccentric to the top of the thin edge thick edge tilted. Cause of this may be due to inclination: (a) or eccentric gear combination of surface machining tolerances of form and position error is too large; (b) does not meet the required quality of the assembly, as eccentric in a rack in a tilted state comprising operation of the moving parts so the force is larger changes occurred fat from the original point contact into surface contact is not easy to form a film of the working surface are not reliable lubrication, the operating temperature will be gradually increased the rack copper sleeve, eccentric and eccentric steel jacket copper sleeve jacket burning until locking.
Two eccentric thin compared with the large capital knot with face detection Xingse
After testing eccentric and gear assembly between the case and found that the larger size of the error at the assembly, the specific situation is eccentric bottom flat bottom surface with the large gear around depths ranging and relative said. In the eccentric sleeve thick edge just below the edge of the sink measured depth is 7.68mm, the thin edge of FAG Precision bearing measured just below the edge of the sink depth is 7.1mm, when checked with a feeler eccentric gear assembly combined with the large surface Positioning the binding of stairs and found no such gap around the eccentric sleeve thick edge just below the gap is 2.3mm, the book just below the edge of the gap is 1.7mm. By comparing the detected data found both upper and lower positions corresponding to the size variation and consistent, the change values ​​are about 0.6mm, the variation is large to small. Ascending again.
In a further disintegration testing, found eccentric tilt is caused by assembly is not in place. After confirmation of the cause of the failure, the replacement of eccentric, due to the eccentric sleeve to ensure accuracy of the assembly with the large gear, after the repair of the 3 'basic machine is in the normal state of the production run. But back to the oil lubrication system on the filter can still recover to the copper foam and tin metal. To prolong the life of the various components, such as under the levelness of the frame body and eccentric bottom thrust bearing levelness pending further inspection or adjustment

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