六排滚子转盘轴承是千吨级全地面起重机的关键部件，主机对该转盘轴承的可靠性要求极高。转盘轴承的合理设计和正确选型是建立在对其进行系统的力学分析的基础之上的。利用转盘轴承在承受联合载荷时的变形协调条件和受力平衡条件，建立千吨级全地面起重机用六排滚子转盘轴承的力学模型，通过与有限元模型计算结果的比较，验证所建立的力学模型的正确性。结果表明：转盘轴承上部两排滚子的载荷显著大于下部两排滚子的载荷。随着转盘轴承轴向游隙的增大，转盘轴承内部承担外部载荷的滚子数量逐渐减少，受载最大的滚子载荷也随之逐渐增大，这一趋势在游隙增大的初期更加明显。在转盘轴承的轴向游隙从0 mm增大到0.28 mm的过程中，转盘轴承的承载能力安全系数先是随之快速下降，然后再缓慢下降。当轴向游隙为0 mm时转盘轴承的安全系数是2.66；然而，当轴向游隙增加到0.28 mm时，转盘轴承的安全系数下降了42%。
Six-row roller slewing bearing is the key component of kiloton class whole ground crane, the host machine has very high reliability requirements for this slewing bearing. Reasonable design and correct selection of slewing bearing are established on the basis of systemic mechanics analysis of it. By using the deformation coordination condition and force equilibrium condition as the slewing bearing undertaking combined loads, the mechanics model of six-row roller slewing bearing used in kiloton class whole ground crane is established, and the correctness of the established mechanics model is verified by comparing its results with the calculated results of finite element model. The results show that: the loads of the two upper row of rollers in the bearing are significantly greater than that of the two lower row of rollers. With the increase of axial clearance of slewing bearing, the number of rollers undertaking the external load decreases gradually inside the slewing bearing, the load of the heaviest loaded rollers increases correspondingly, this trend is more distinct during the early stage of clearance increase. During the process of the axial clearance increase of the slewing bearing from 0 mm to 0.28 mm, the carrying capacity safety factor of the slewing bearing decreases quickly first, then decreases slowly. The safety factor of the slewing bearing is 2.66 when the axial clearance is 0 mm, however, as the axial clearance increases to 0.28 mm, the safety factor of the slewing bearing decreases by 42 percent.
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