23EX直线加速器7年故障统计分析经验

摘要

目的 研究故障统计分析在23EX加速器日常维护中的应用.方法 收集2008—2015年间23EX加速器的故障数据.分析23EX加速器故障率与时间关系,利用帕累托图统计分析影响23EX加速器稳定性的主要子系统和主要零部件.结果 23EX加速器运行7年共发生故障318次,更换零部件358个.加速器投入使用后1.5年内故障率逐渐增加,最高时达38次/半年,之后有所下降并保持相对稳定,1年中第3季度是加速器故障率最高时间段.影响23EX加速器稳定性的主要子系统是MLC和机械系统,分别占总故障数66.4%和11.9%;影响23EX加速器稳定性的主要零部件是MLC叶片螺母和叶片马达,分别占总更换零部件的38.8%和28.5%.结论 加速器故障统计分析有助于维护人员发现故障的分布规律,找出影响加速器稳定性的主要因素,为制定日常维护计划、改善维护策略提供依据.%Objective To study the application of statistical analysis of failure in the maintenance of a 23EX linear accelerator. Methods The failure data of a 23EX linear accelerator were collected from 2008 to 2015. The relationship between failure frequency and running time of the 23EX linear accelerator was analyzed. The Pareto diagram was used to analyze the main subsystems and components that had impacts on the stability of the 23EX linear accelerator. Results The 23EX linear accelerator had a total of 318 failures and 358 components replaced in 7 years. Within the first 1. 5 years of use, the failure frequency gradually increased and the highest frequency was up to 38 failures per 6 months. Afterwards, the failure frequency declined and remained relatively stable. The third quarter had the highest failure frequency in a year. Multileaf collimator ( MLC ) and mechanical system, responsible for 66. 4% and 11. 9% of failures, respectively, were the main subsystems that had impacts on the stability of the 23EX linear accelerator. MLC nut and motor, taking 38. 8% and 28. 5% of replaced components, respectively, were the main components that had impacts on the stability of the 23EX linear accelerator. Conclusions The statistical analysis of accelerator failure helps maintenance personnel figure out the distribution of failures and identify the main factors for the accelerator stability. Moreover, it provides a basis for improving maintenance strategy.