多层股钢丝绳早期失效原因分析及解决措施

介绍多层股钢丝绳特点。多层股钢丝绳生产难度较大,使用时常出现早期失效问题。以18×7类两层股钢丝绳为例,分析早期失效的原因:内外层绳分层及外层股松动;钢丝绳旋转;内层绳早期断裂。提出解决措施:减小股的捻距;控制内层股打扭角度为1080°～1440°,外层股为360°～540°,将内层绳变形率控制在40%以内;合理调整外层股预变形工艺参数,使钢丝绳中股的预螺旋线长度和固有螺旋线长度之比控制在0.95～0.97;对多层股微旋转钢丝绳内外层股间进行填塑,解决内层绳钢丝断裂问题。

Initial failure cause analysis and settlement measures of multi-layer strands wire rope

To introduce the characteristics of multi-layer strands wire rope. It is pointed out that the multi-layer strands wire rope is difficult to produce and often appears initial failure. Taking 18 × 7 type two layer strands wire rope as example to analyze the cause for initial failure, the causes are： layers of inner and outer layer rope separate and outer strands become flexible; wire rope rotating; inner layer rope break at earlier stage. Settlement measures are put forth： to decrease strand lay pitch; to control inner layer strand twist angle at 1 080°- 1 440° , outer layer strand at 360° -540° , and control inner layer rope deformation rate within 40% ; to adjust pre-deforming process parameters of outer layer strand rationally makes the length ratio between pre-helix and inherent helix of strand control within 0.95 - 0.97 ; to fill plastic between inner and outer strands for micro-rotation wire rope to resolve the problems of steel wire breaking in inner layer rope.