为明确回转支承轮齿间碰撞失效的动力学原因,以回转支承的外齿圈齿轮为研究对象,建立回转支承轮齿在制动停车下的冲击动力学理论计算模型,并运用显式动力学有限元数值分析方法,分析回转支承轮齿在不同回转速度下停车的动态响应特性,探讨回转速度对回转支承外圈轮齿的影响规律。结果表明冲击载荷是引起点蚀和断齿的主要原因;冲击响应随回转速度的增加而增加。

In order to figure out the origin of the gear failure of crane slewing bearing, taking the outer race gear as research object, an impact dynamics calculation model of the gear under the condition of revolve braking was established, the shock response properties of the gear in different rotary speed were analyzed , and its general rule was discussed by using the explicit dynamics FEA analysis method. The result shows that the impulsive force is the main reason of gear surface pitting and brokenness;the shock responses are more serious while the rotary speed is increasing.

简要分析了起重机回转支承常见故障类型、故障成因及机理，提出从技术和管理两个层面对起重机回转支承故障进行预防和控制，制定了回转支承在设计、制造、安装、使用和维保等环节故障的预防和控制措施。强化设计理念，提高制造安装水平，建立科学的使用制度，加强维修保养工作等是回转支承故障预防和控制的核心工作。

The paper briefly analyzes the common failure types,failure causes and mechanism of the crane bearing, proposes to prevent and control the failure from technology and management,and presents related prevention and control measures against failures during design,manufacturing,installation,utilization,and maintenance of the slewing bear-ing.It’s required to focus on strengthening the design theory,improving manufacturing and installation level,building sci-entific utilization system,and advancing maintenance work for the purpose of failure prevention and control.

针对浮式固定抓斗起重机回转支承内齿轮圈连接螺栓断裂问题，在支承圆筒和回转支撑座与回转轴承连接的法兰局部变形处，进行对上轴承座连接处加垫片修正处理，保证轴承固定用法兰受力均匀，解决回转支承内齿轮圈连接螺栓断裂问题。

For joint bolt fracture problem of floating fixed grab crane slewing bearing internal gear ring , revising it by placing gaskets where cylinder and rotating in supporting brackets and slewing bearing connection flange local deform , ensuring the fixed with flange bear stress uniformity .In this way , the problem of rotary bearing internal gear ring joint bolt fracture can be solved .

回转支承的承载能力计算无法沿用普通轴承的理论,传统计算方法忽略众多因素影响,结果误差较大,近些年科研人员采用的计算模型复杂、计算时间长.本文采用非线性弹簧建立了变桨回转支承的有限元模型,并与经验公式进行对比,验证了模型的正确性.在此基础上,详细分析安装法兰厚度、法兰筒壁厚、法兰筒结构形式及法兰端面的平面度对载荷分布的影响.结果表明:安装法兰厚度以回转支承厚度50%为宜,法兰筒壁厚度对载荷分布影响较小,但筒壁应尽量设计在靠近滚珠一侧,法兰平面度误差对回转支承滚道与滚珠接触压力影响较大,严重影响回转支承的承载能力和使用寿命,在加工和安装过程中要严格控制.

Capacity calculation of slewing bearing is different from the normal bearing design theory .The traditional method ignored many factors , resulting in a large error in the results .A few models developed in recent years are very complex and require a long time to complete the calculations .This paper illustrates a new method , in which a nonlinear spring is used to establish a finite element model of the pitch slewing bearing .The calculation precision of this model is compared with the empirical formula;the results verify the correctness of the model .Then , a detailed analysis of the influence of the flange thickness , wall thickness , flange tube structure type and flange surface flat-ness on the load distribution was completed based on the simplified model .The results showed that the flange thick-ness to slewing bearing thickness should be 50%, the flange tube wall thickness has a small amount of influence on the load distribution , but the wall should be arranged in close proximi

堆取料机的回转机构是整机执行悬臂回转动作的重要组成部分，作用是带动斗轮机构、俯仰机构以及配重等上部结构在水平面内转动，而回转支承是回转机构的核心部分。利用ANSYS软件针对回转支承的轮轨进行非线性有限元接触分析，得出接触应力云图和总变形图。通过有限元接触分析结果与理论计算比较得出接触应力小于许用值，验证了结构满足使用要求，为回转机构设计提供了参考。

The slewing mechanism of stacker reclaimer is an important part of the cantilever rotary action .The role is to drive the superstructure part of the bucket wheel ,luffing mechanism as well as with weight in the horizontal plane .The slewing ring is the core part of slewing mechanism .Using ANSYS for slewing ring the non-linear of wheel contact FEA come to contact stress nepho-gram and the total deformation diagram .Through the finite element analysis results and the theoretical calculation result can meet the requirement of contact stress and confirme the structure to satisfy the operation requirements .It provide the necessary basis for the slewing mechanism design .