【作者】 王兴珊；

【导师】 钱静；

【作者基本信息】 江南大学 ， 包装工程， 2008， 硕士

【摘要】 包装机械在包装工业中占有举足轻重的地位,包装机械的生产效率、自动化程度以及工作的可靠性直接影响到产品的包装的质量和速度。随着包装工业的迅速发展,包装机械已经成为国内机械工业中的十大行业之一。但是根据统计显示,目前我国的包装机械产品,在产品质量、可靠性、精度等各方面,与发达国家的产品仍存在着相当的差距。评估包装机械的可靠性水平、分析包装机械的故障数据是提高产品的质量、增强企业市场竞争力的有效手段。鉴于目前包装机械可靠性工作研究的不足,论文利用可靠性工程的基本理论和数理统计的方法,借鉴其他领域的可靠性研究的方法,对包装机械的可靠性关键指标平均故障间隔时间(MTBF)的计算方法和故障分析的方法进行了详细的探讨,确立了指标的计算流程,初步建立了包装机械可靠性分析的基本理论。课题结合无锡哈佛电子秤包装机有限公司生产的6RS电子秤包装机,阐述了包装机械的MTBF计算流程和故障分析方法。为了获得比较准确的MTBF,论文首先拟合故障间隔时间的分布模型,然后引入灰关联分析法寻求故障间隔时间的最佳分布函数,最后用数学期望法计算得到MTBF。为了提出有效的可靠性改进措施,论文综合运用故障模式及影响分析法和故障树分析法分析包装机械的故障。同时,为了方便企业的可靠性信息统计和分析工作,论文以Visual Basic6.0编程语言为开发平台,采用Access数据库技术,开发了包装机械的可靠性信息管理系统。该系统主要有三大功能:可靠性信息的管理模块,包括故障数据的输入、维护和查询等;可靠性指标的计算模块,包括分布函数的拟合、假设检验、拟合择优以及MTBF的点估计和区间估计等;故障分析模块,包括整机和子系统的故障模式和故障原因分析。该系统为企业可靠性信息管理的规范化和产品的改进提供了有效的依据。更多还原

【Abstract】 Packaging machinery plays an important role in the development of packaging Industry. The production efficiency, automation and reliability of packaging machinery determine the rate and quality of packaging. With the rapid development of packaging Industry, packaging machinery has become one of the top ten Industries of machinery. However, according to the related investigation, there is a gap between packaging machinery in China and those of developed countries, in aspects of quality, reliability, precision and so on.Evaluating the reliability of packaging machinery and analyzing failure data can help improve quality of products and strengthen the competition of enterprises in market. Due to the deficiency of reliability research on packaging machinery, this paper utilizes basal theory of reliability engineering and method of statistic, and uses studying method of other field for reference. Methods of calculating mean time between failures(MTBF), a critical index of reliability, and ways of analyzing failures are discussed in detail. The best calculating flow is established and the basal theory on reliability analyzing for packaging machinery is built in this paper.This paper takes the reliability analysis of 6RS Roto-Packer with electronic balance produced by Wuxi Haver Cement Machinery Company as an example to illustrate the method. To acquire accurate meantime between failures, the distribution function should be fitted, then the grey associative analysis is used to get the best distribution model, from which precise MTBF can be obtained by calculating the expectation. To provide effective methods of improving reliability of packaging machinery, Failure Mode and Effects Analysis is applied combined with Fault Tree Analysis to analyze failure data of the product.In the meantime, to make the statistic and analysis of packaging machinery more convenient, the reliability information managing system is developed, taking the Visual Basic6.0 as a platform and using the Access database. This system has three major functions. The first part is reliability information management, including input and amending and inquiry of failure data and so on. The second part is to calculating the main reliability indexes, including fitting the distribution function, assumption test, choosing the best model, point and interval estimation of MTBF and so on. The last part is to analyze failures of products through counting failure modes and failure reasons of the product and its subsystems. This system provides enterprises effective basis for the standardization of reliability management and helps improve the product.更多还原