清洗段碱液循环泵的故障分析及改进

Fault analysis and improvement of alkali circulation pump in cleaning section

本文分析阐述了碱液循环泵在连续退火机组清洗段生产使用中出现的循环泵机械密封漏液、泵体轴承损坏、循环泵泵轴断裂等故障。为解决这些问题,详细分析了出现这三种故障的具体原因,循环泵机械密封漏液是因为碱液杂质多导致机械密封石墨环损坏、机封装配过程有杂质进入机械密封内;泵体轴承损坏是由于碱液进入轴承箱导致轴承润滑不良、原设计轴承选型不合适;循环泵泵轴断裂是由于循环泵轴承频繁损坏,轴承损坏后泵转动不平衡导致的。针对以上主要故障采取的有效改进措施:在循环泵机封和轴承箱之间加装挡水环,选择能够承受轴向窜动的角接触球轴承、后置改为双轴承,提高循环泵装配精度和清洁度。改进后循环泵的问题得到解决,泵的使用寿命大大提高。

This paper analyzes and explains the failures that occur in the circulation pump of a continuous annealing unit during cleaning section production,such as leaks from mechanical seals,damage to bearing of pump body,and fracture of pump shaft.In order to solve these problems,the specific reasons for these three types of failures are analyzed in detail.Leakage from mechanical seals is caused by impurities in the alkali liquid leading to damage to the graphite rings of the mechanical seals and contamination entering the sealing process.Bearing damage of pump body is due to lubrication issues caused by alkali liquid entering the bearing box and inappropriate selection of bearings in the original design.Fracture of pump shaft is caused by frequent damage to the circulation pump's bearings leading to imbalanced rotation after bearing failure.Effective improvement measures are taken to address these main failures:installing water retaining rings between the circulation pump's sealing elements and bearing box,selecting angular contact ball bearings capable of withstanding axial play,changing to dual-bearings at the rear,and improving the assembly precision and cleanliness of the circulation pump.After implementing these improvements,the problems with the circulation pump are resolved,resulting in a significant increase in the service life of the pump.