回转支承应用于大口径钻机动力转盘，不仅解决了大口径钻机动力传动的支承问题，也开阔了设计思路。文章介绍了应用于钻机的回转支承选型、结构特点及工作原理，指出了今后的发展方向。 Rotary support used in large-diameter drilling rig power turntable, not only to solve the large-diameter rig power transmission support problems, but also broaden the design ideas. This paper introduces the slewing bearing selection, structural characteristics and working principle applied to the rig, and points out the future development direction.