Purpose

This paper aims to present a dynamic reliability model of scraper chains based on the fretting wear process and propose a reasonable structural optimization method.

Design/methodology/approach

First, the dynamic tension of the scraper chain is modeled by considering the polygon effect of the scraper conveyor. Then, the numerical wear model of the scraper chain is established based on the tangential and radial fretting wear modes. The scraper chain wear process is introduced based on the diameter wear rate. Furthermore, the time-dependent reliability of scraper chains based on the fretting wear process is addressed by the third-moment saddlepoint approximation (TMSA) method. Finally, the scraper chain is optimized based on the reliability optimization design theory.

Findings

There is a correlation between the wear and the dynamic tension of the scraper conveyor. The unit sliding distance of fretting wear is affected by the dynamic tension of the scraper conveyor. The reliability estimation of the scraper chain with incomplete probability information is achieved by using the TMSA for the method needs only the first three statistical moments of the state variable. From the perspective of the chain drive system, the reliability-based optimal design of the scraper chain can effectively extend its service life and reduce its linear density.

Originality/value

The innovation of the work is that the physical model of the scraper chain wear is established based on the dynamic analysis of the scraper conveyor. And based on the physical model of wear, the time-dependent reliability and optimal design of scraper chains are carried out.

中文翻译：

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基于微动磨损过程的刮板链时效可靠性及优化设计

目的

本文旨在提出一种基于微动磨损过程的刮板链动态可靠性模型，并提出合理的结构优化方法。

设计/方法/方法

首先，通过考虑刮板输送机的多边形效应对刮板链的动态张力进行建模。然后，基于切向和径向微动磨损模式建立刮板链的数值磨损模型。根据直径磨损率介绍刮板链磨损过程。此外，基于微动磨损过程的刮板链的时间相关可靠性由三阶矩鞍点近似 (TMSA) 方法解决。最后，基于可靠性优化设计理论对刮板链进行优化。

发现

刮板输送机的磨损与动态张力之间存在相关性。微动磨损的单位滑动距离受刮板输送机动态张力的影响。该方法仅需要状态变量的前三个统计矩，利用TMSA实现概率信息不完全的刮板链的可靠性估计。从链传动系统来看，基于可靠性的刮板链优化设计可以有效延长其使用寿命，降低其线密度。

原创性/价值

工作的创新点是在刮板输送机动力学分析的基础上建立了刮板链条磨损的物理模型。并基于磨损的物理模型，进行了刮板链的瞬态可靠性和优化设计。