铸铁烘缸附加弯矩条件下反向法兰计算方法分析研究

Flanges in Cast Iron Drying Cylinders under Additional Bending Moment Conditions

关键词:  铸铁烘缸  反向法兰  附加弯矩  ASME  PD5500  FEM

Key Words:cast iron dryer  reverse flange  additional bending moments  ASME  PD5500  FEM

摘要:铸铁烘缸在运行过程中,由于两端支反力的存在,导致端盖与缸体上反向法兰连接处产生附加弯矩。传统法兰连接设计采用Waters法,未考虑附加弯矩的影响。本文基于美国ASME和英国PD5500标准中的反向法兰计算方法,引入附加弯矩因素,对计算公式进行改进。实例计算显示,加入附加弯矩后,三个主应力的大小增加了约40%。然后,利用有限元仿真验证了改进公式的正确性。研究表明,附加弯矩对法兰连接的安全性有显著影响,改进后的计算方法能够更准确地反映实际工况,为铸铁烘缸法兰设计提供可靠的依据。

Abstract:During the operation of a cast iron dryer, additional bending moments are generated at the connection between the end cover and reverse flange on the cylinder block owing to the reaction force at both ends. Traditional flange connection design uses the Waters method and does not consider the effects of additional bending moments. In this study, based on the reverse flange calculation method in the American ASME and British PD5500 standards, additional bending moment factors were introduced to improve the calculation formula. The calculations show that the magnitude of the three principal stresses increases by approximately 40% with the addition of additional bending moments. Subsequently, the accuracy of the improved formula was verified by finite element simulation. The results show that the additional bending moment has a significant impact on the safety of the flange connection, and the improved calculation method can more accurately reflect the actual working conditions, which provides a reliable basis for the design of cast-iron dryer flanges.