摘要
针对变桨轴承连接螺栓因预紧力不足导致疲劳断裂问题,分析造成预紧力不足的拉伸器拉伸回弹现象,通过实验研究影响拉伸器拉伸回弹的因素。分步骤改进拉伸器紧固螺栓的拉伸工艺,实验数据表明,在螺母下增加垫圈、在螺母及螺纹处涂润滑膏、重复预紧以及超张拉都有助于稳定螺栓残余预紧力,减小离散性。研究结果表明,使用改进后的紧固螺栓拉伸工艺,螺栓残余预紧力平均值达到设计目标值的98%,且非常稳定。
Aiming at the problem of fatigue fracture of the pitch bearing connecting bolts due to insufficient pre-tightening force,the tensile"rebound"phenomenon of the tensioner caused by insufficient pre-tightening force is analyzed.This paper studies on the factors that affect the rebound phenomenon through experiments,and improves the operation process of the pre-tightening bolts of stretcher step by step.It shows that adding washer under the nut,and applying lubrication on the nuts and threads,or repeated stretching of the fastening bolts,as well as over tensioning,all help stabilize residual preload and reduce dispersion.The result shows that the average residual preload reaches 98%of the design target by using the improved tightening bolt stretching process,and it is very stable.
作者
童跃平
朱斌辉
徐东杰
赵佰余
陈皓
支道跃
邹渊士
Tong Yueping;Zhu Binhui;Xu Dongjie;Zhao Baiyu;Chen Hao;Zhi Daoyue;Zou Yuanshi(Huayi Wind Energy Co., Ltd., Zhejiang Wenzhou, 325000, China)
出处
《机械设计与制造工程》
2022年第6期88-92,共5页
Machine Design and Manufacturing Engineering
关键词
风力发电机
变桨轴承连接螺栓
失效分析
拉伸回弹
测试
wind turbines
bolt connection for pitch bearings
failure analysis
stretch rebound
test
