塔式起重机回转支承大多采用交叉滚柱式。我公司在检修中发现,这种回转支承使用若干年后,在齿圈外座圈下滚道面,不同程度地出现了淬硬层剥落现象(以下简称“剥层”),位置一般在滚道退刀槽下侧边缘,在整个圆周方向上有2处以上者居多。“剥层”区域边缘呈现多处裂缝,有时用手稍用力也可剥落若干碎片。“剥层”部位底部粗糙不平。1 “剥层”的判断我公司几年来在塔机的使用和修理中逐步摸索到,支承滚道面的“剥层”是由开始时的毛细裂缝扩展而引起的,继而形成轻微的“剥层”,此时如不及时加以修复处理,则剥落下来的碎 Tower crane slewing bearings mostly use cross roller type. In inspection and repair, our company found that after several years of use of this kind of slewing bearing, the raceway surface under the outer ring of the ring gear has appeared to a certain degree in the phenomenon of exfoliation of the hardened layer (hereinafter referred to as “peeling layer”), and the position is generally rolling. The lower edge of the retracted sipe has two or more of them in the entire circumferential direction. There are many cracks on the edges of the “stripping” area. Sometimes it is also possible to peel off some debris with a little force. The bottom of the “stripping layer” is rough. 1 Judgment of “Layering” Our company gradually explored in the use and repair of tower cranes for several years. The “peeling” of the supporting raceway surface was caused by the expansion of capillary cracks at the beginning, which in turn formed a slight “peeling”. Layer", if it is not repaired in time, it will be peeled off