回转支承装置是起重、施工类机械设备承受主载荷的重要部件。我公司进口的二手韩国双龙２８Ｍ砼泵车，其上车部分是意大利产的ＣＩＦ产品组合件，因使用年久，泵送悬臂架回转支承的滚道与滚柱磨损严重，轴向跳动间隙达７．６ｍｍ左右，严重影响砼泵送稳定性。 经测绘发现，该支 Rotary support device is lifting, construction machinery and equipment to withstand the main part of the main load. My company imported second-hand Ssangyong 28M concrete pump truck, the car is part of the Italian-made CIF product portfolio, due to the use of long, pumping cantilever slewing ring and roller wear serious, the axial play gap of up to 7.6mm or so, seriously affecting the stability of concrete pumping. The survey found that the branch