Investigation on influences on the service life of running ropes under reverse bending

反向弯曲对运行绳使用寿命的影响研究

• 批准号: 406702566
• 负责人: Professor Dr.-Ing. Robert Schulz, since 7/2019
• 金额: --
• 依托单位: Institut für Fördertechnik und Logistik (IFT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/406702566?language=en
• 关键词: Investigation; influences; service; life; running

The influences of reverse bending on the reduction of service life of running ropes compared to simple bending is today mostly uninvestigated. Nevertheless, in many applications of mechanical handling machinery like elevators, cranes, ropeways, or in stage machinery, it is not possible to avoid reverse bending completely and therefore it has to be included into the lifetime calculation of the rope drives. State of the art standards and lifetime calculation methods take account of the additional damaging of running ropes under reverse bending on basis of a general constant factor. On the other hand, in advance of this research proposal conducted literature research, as well as pilot tests on bending machines of IFT showed dependencies of the service life reduction due to reverse bending of many parameters, e.g number of strands, lay, rope force and sheave to rope diameter ratio. Especially the axis distance of the sheaves under reverse bending evidently have great influence on the amount of additional damaging to the running rope. The conducted pilot tests revealed remarkable discrepancies compared to the results of theoretical lifetime calculation what in many cases can lead to major safety risks. The proposed research project aims on conducting basic research to develop widely usable parameters for taking the service life reduction of ropes under reverse bending into account for lifetime calculation of rope drives. Especially the circumstances under which the rope can “escape” the additional damaging due to reverse bending, but also the circumstances under which the additional damaging of the rope is disproportionately higher are to be investigated. The results of the scientific investigation will increase the availability and safety of rope drives with reverse bending and eliminate today existing safety risks. Existing knowledge deficits will be closed and for example possibly wrong estimations of rope lifetime in rope drives with reverse bending, safety risks and wrong estimations with view to service and inspection intervals will be avoided in future. The acquired understanding of the mechanisms of damage of the rope under reverse bending can be of use in all fields of applications of materials handling.

与简单弯曲相比，反向弯曲对降低运行绳索使用寿命的影响目前大多未被研究。然而，在机械搬运机械的许多应用中，如电梯、起重机、索道或舞台机械中，不可能完全避免反向弯曲，因此必须将其包括在绳索驱动器的寿命计算中。现有技术标准和寿命计算方法基于一般常数因子考虑了运行绳索在反向弯曲下的附加损坏。另一方面，在本研究建议之前，进行了文献研究，以及对IFT弯曲机进行的试验表明，由于反向弯曲，许多参数（如股数、捻距、钢丝绳力和绳轮与钢丝绳直径比）对使用寿命的影响。特别是反向弯曲时滑轮的轴距对走行钢丝绳的附加损伤量有很大的影响。进行的试点测试显示，与理论寿命计算结果相比，存在显着差异，在许多情况下可能导致重大安全风险。拟议的研究项目旨在进行基础研究，以开发广泛使用的参数，将反向弯曲下绳索的使用寿命减少考虑到绳索驱动器的寿命计算。特别是，要研究绳索能够“逃脱”由于反向弯曲而造成的额外损坏的情况，以及绳索的额外损坏不成比例地更高的情况。科学研究的结果将提高反向弯曲绳索驱动的可用性和安全性，并消除目前存在的安全风险。现有的知识不足将被弥补，例如，在反向弯曲的绳索驱动装置中可能错误地估计绳索寿命，安全风险以及未来服务和检查间隔的错误估计将被避免。所获得的了解的机制下的反向弯曲的绳子的损坏可以在所有领域的材料处理的应用。