Rolling bearings are ball bearings, roller (tapered) bearings and needle bearings. They often work at high speeds and under heavy loads. After long-term use, wear, ablation, fracture, fatigue spalling and spots will occur on rolling bodies and raceways.

　　滚动轴承一般不拆供检查。在检验过程中进行清洗，通过外部检验、空转检验和内部间隙检验来判断其质量。

　　Rolling bearings are generally not disassembled for inspection. In the process of inspection, cleaning is carried out, and its quality is judged by external inspection, idling inspection and internal clearance inspection.

　　1. 外检发现有下列情况之一的，应当更换或者修改。

　　1. If one of the following circumstances is found in the external inspection, it shall be replaced or modified.

　　(1)钢球、滚子及内外滚道因烧蚀而改变原有光泽。

　　(1) The original luster of steel balls, rollers and inner and outer raceways is changed by ablation.

　　(2)轴承内外滚道产生撞击痕迹、擦伤、擦伤和异常磨损。

　　(2) The internal and external raceways of bearings produce impact marks, scratches, abrasions and abnormal wear.

　　(3)轴承内外滚道、钢球和滚子裂纹、金属分层、水垢剥落及大量黑点。

　　(3) Cracks in inner and outer raceways, steel balls and rollers, metal delamination, scale peeling and a large number of black spots of bearings.

　　(4)在隔离环中，密封圈有穿透性裂纹，缺少铆钉或松动。

　　(4) In the isolation ring, there are penetrating cracks in the sealing ring, lack of rivets or loosening.

　　(5)钢球隔离环槽磨损过大，钢球会自行脱落。

　　(5) The steel ball isolation ring groove wears too much, and the steel ball will fall off by itself.

　　6. 轴承隔震圈端面磨损深度大于0.30mmo

　　6. End face wear depth of bearing isolation ring is greater than 0.30 MMO

　　圆锥滚子磨损时，工作面的小端面凸出在轴承外的阀座环端面上。

　　When tapered roller wears out, the small end face of the working face protrudes on the end face of the seat ring outside the bearing.

　　我们圆锥滚子轴承内圈内圈内端面切口大，金属剥落。

　　Our tapered roller bearing inner ring inner end face cut large, metal peeling.

　　如果只有轻微腐蚀性黑点在轴承和轻微缺陷隔离环圈而不影响旋转,不超过4破洞的周长的法兰表面小的圆锥滚子轴承的内圈环,和两个相邻孔有一定的距离,它仍然可以被使用。

　　If only slightly corrosive black spots are present in the bearing and slightly defective isolation ring without affecting rotation, the inner ring of a small tapered roller bearing with a flange surface no more than 4 holes and a distance from two adjacent holes can still be used.

　　2. 空转试验:空转轴承，检查轴承转动是否轻巧灵活，无噪声、滞止、堵塞。轴承旋转的不均匀性可以通过手的感觉来判断。

　　2. idle test: idle bearing, check whether the rotation of the bearing is light and flexible, no noise, stagnation, blockage. The non-uniformity of the bearing rotation can be judged by the feeling of the hand.

　　3.通过检查滚珠轴承的径向间隙和轴向间隙，检查滚珠轴承的磨损情况，确定是否在规定的值范围内。

　　3. By checking the radial and axial clearances of ball bearings, checking the wear of ball bearings, determine whether in the specified value range.