门座式起重机改造后安全可靠性论证

Demonstration of safety and reliability of portal crane after improvement

门座式起重机的安全可靠性是表征其在设计、制造、安装和质量方面的综合特性。文中仅对某船厂门座式起重机改造后， 最能代表其安全可靠性的几个方面进行论证， 并为今后遇到类似问题时， 提供基本解决办法。

This paper demonstrates some aspects on safety and reliability of portal crane just after it is improved,for its safety and reliability will show its comprehensive characters in design,manufacture,installation and quality. And some basic methods to solve similar problems are also given here.