三代核环吊吊钩组升降直线度偏差研究

核电站用环行桥式起重机由于其特殊的工作场合,对吊载的定位精度有严格要求,三代核环吊通过平衡机构和钢丝绳的平衡缠绕来保证其升降直线精度.通过建立核环吊吊钩组钢丝绳缠绕系统的力学模型,采用静平衡方法研究某三代核环吊在不同起升重量、不同起升高度下吊钩组的运行轨迹及直线度偏差.结果表明:相同起升高度条件下,当起升量较大时,起升重量对吊钩组升降直线度偏差的影响较小;相同起升重量条件下,升降直线度偏差与起升高度呈非线性关系;该三代核环吊采用的钢丝绳平衡缠绕方式,能够保证吊钩组的直线度偏差小于±5mm/10m.该分析方法及结果为核环吊起升机构的设计提供了理论依据.

Research on straightness accuracy about hook assembly of the third-generation nuclear ring crane

Ring cranes used in nuclear power stations have strict requirements for the positioning accuracy of lifting objects because of the unique applications. The third-generation nuclear ring cranes control the straightness accuracy in the lifting process through the arrangement of the balance mechanism and the balance winding of wire rope. The running track and the straightness deviation of the third-generation nuclear ring cranes under different hook loads and lifting heights are investigated by static balanced approach and the mechanical model for the wire rope winding system is established. The experimental results indicate that: hook load has a little influence on the straightness accuracy of the third-generation nuclear ring cranes in the condition of large hook load and the same lifting height, the straightness accuracy has a non-linearity relation with the lifting heights in the condition of the same hook load, the third-generation nuclear ring cranes with the balance winding of wire rope can guarantee the straightness accuracy less than ±5 mm/10 m. The analytical method and the results got can give some theoretical information for the design of nuclear ring crane.