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某单位送修TQ60/80塔式起重机,谈到回转不稳定、晃动。经拆检,发现其回转支承部分有严重损伤。八个支承滚轮有六个已严重磨损,滚道上有多道圆周方向的沟痕。原因是:八个支承滚轮的轴中缺少黄油,长期未予润滑。结果使滚轮锈死,滚道与滚轮之间产生滑动摩擦,造成滚轮单边偏磨。同时尘土、砂子混进滚道,嵌入摩擦部分而使运动受阻。间隙增大,产生塔帽回转不稳。再如,大修某台W-1001挖掘机时,拆卸履带行走装置爬行主轴上的尼龙套时,轴表面严重缺油,呈黑色,主轴上的油道已堵实,拆卸十分困难,套磨损很严重。
A unit repaired the TQ60/80 tower crane and talked about unstable rotation and shaking. After being dismantled, it was found that the slewing bearing portion was seriously damaged. Six of the eight support rollers have been severely worn and there are multiple circumferential grooves on the raceways. The reason is: the lack of butter in the shafts of the eight support rollers has not been lubricated for a long time. As a result, the roller rusted and sliding friction occurred between the raceway and the roller, causing the roller to wear unilaterally. At the same time, dust, sand mixed into the raceway, embedded in the friction part of the movement blocked. As the gap increases, the tower cap rotates unsteadily. For example, when overhauling a W-1001 excavator, when the crawler running device is used to crawl the nylon sleeve on the main shaft, the shaft surface is seriously deficient in oil and appears black. The oil passage on the main shaft is blocked, and the removal is very difficult. The wear of the sleeve is very high. serious.