摘要
针对风电机组高强螺栓拆卸后,二次使用时螺栓预紧力是否满足设计要求的问题,基于超声波法测量螺栓预紧力技术,采用了一款高精度的小型便携式超声波螺栓预紧力测试仪,对基于扭矩法安装的轮毂与变桨轴承连接位置高强螺栓初次使用和二次使用时的预紧力分布进行了实验测试与分析。比较了实际现场装配中螺栓获取的预紧力与理论计算预紧力的偏差,以及二次使用对螺栓预紧力的影响,提出了用超声波法测量和控制风电机组高强螺栓预紧力的新工艺。研究结果表明:高强螺栓初次使用时,预紧力与理论计算值吻合较好;高强螺栓二次使用时,预紧力平均下降13%左右,分散度变化不大,预紧力分布范围仍符合设计要求;在保持施拧扭矩不变或适当提高施拧扭矩的情况下,高强螺栓可二次使用。
Aiming at the problem that the pre-tightening force of high-strength bolts in wind turbine whether to meet the design requirements when they are reused for the second time,based on the ultrasonic measuring technique of the bolts’pre-tightening force,a high-precision and portable ultrasonic bolt pre-tightening force tester was used to test the distribution of pre-tightening force between hub and pitch bearing installed by torque method when the bolts were used for the first and second time.The deviation between the pre-tightening force obtained in actual field assembly and by theoretical calculation were compared,and the influence of bolts reused on the pre-tightening force was dis-cussed.A new technique for measuring and controlling the pre-tightening force of high strength bolts in wind turbines by ultrasonic method was proposed.The results indicated that the pre-tightening force obtained from high strength bolts used for the first time is in good agreement with the target value.The pre-tightening force obtained from reused high strength bolts is 13%lower than the target value in average,the distribution range still meet design requirement,and the high-strength bolt can be reused while keeping the twisting torque unchanged or in-creasing the twisting torque in an appropriate proportion.
作者
吴晨
WU Chen(Department of Mechanical Technology,Zhejiang Institute of Mechanical&Electrical Engineering,Hangzhou 310053,China)
出处
《机电工程》
CAS
北大核心
2020年第1期78-82,共5页
Journal of Mechanical & Electrical Engineering
基金
浙江省重点研发计划项目(2019C01050)
关键词
风电机组螺栓
预紧力
扭矩系数
初次使用
二次使用
超声波螺栓预紧力测试仪
bolts in wind turbine
pre-tightening force
torque coefficient
first use
secondary use
ultrasonic bolt pre-tightening force tester
作者简介
吴晨(1982-),女,浙江杭州人,硕士,助理研究员,主要从事风力发电技术、高等职业教育方面的研究.E-mail:88095561@qq.com。
