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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 rows of roller slewing bearings are the key components of the kiloton all-terrain cranes, and the host demands extremely high reliability of the turntable bearing. The rational design and correct selection of the turntable bearing are based on the systematic mechanical analysis of the turntable bearing. The mechanical model of the six-row roller turntable bearing for kiloton cranes is established by using the deformation coordination condition and the force balance condition of the turntable bearing under the joint load. By comparing with the calculation results of the finite element model, the established The correctness of the mechanical model. The results show that the load of the two rows of rollers in the upper part of the turntable bearing is obviously larger than the load of the two rows of rollers in the lower part. With the increase of the axial clearance of the turntable bearing, the number of rollers bearing the external load inside the turntable bearing gradually decreases, and the maximum loaded roller load also increases gradually. This tendency is further increased in the early stage of the clearance increase obvious. During the increase of the axial clearance of the turntable bearing from 0 mm to 0.28 mm, the safety factor of the bearing capacity of the turntable first decreases rapidly then decreases slowly. The safety factor of the turntable bearing is 2.66 when the axial clearance is 0 mm; however, the safety factor of the turntable bearing is reduced by 42% when the axial clearance is increased to 0.28 mm.