为预测刮板输送机链条平环疲劳失效时间,基于试验载荷数据对其进行寿命预测。以38mm×137 mm的C级型号链环为研究对象,采用张力应变测试装置对刮板输送机链条张力进行在线监测,获得10个工作周期链条平环应变载荷数据,结合张力数值标定、雨流法、Goodman模型等手段对其进行数据处理、分析和平均应力修正,通过链环材料的屈服极限来估算链环疲劳特性曲线。研究结果表明：刮板输送机链条平环轴肩处是强度薄弱点,易发生应力集中现象,最大应力为719.5 MPa;对平环疲劳寿命分析显示,刮板输送机链条平环寿命为42 050次循环,链轮链环共啮合84 100次。该结论可为以后刮板链环结构设计和优化以及定期维修、更换提供参考。
In order to predict a fatigue failure time of the flat ring applied to the chains of the scraper conveyor,based on the test load data,a prediction of the service life was conducted. Based on a Φ38 mm×137 mm C grade type chain ring as the study object,a tensile strain test device was applied to the online monitoring and measuring of the chain tensile to the scraper conveyor. The flat ring strain loading data of the conveyor chains with 10 working periods were obtained. In combination with the tension numerical calibration,rain flow method,Goodman model and other means,a data processing,analysis and average stress correction were conducted on these data obtained. The yield limit of the chain ring material was applied to estimate the fatigue characteristic curve of the chain ring. The study results showed that the shaft shoulder point of the chain flat ring applied to the scraper conveyor would be the weak point of the strength,a stress concentration phenomenon would be easily occurred and the max stress value would be 719.5 MPa. The analysis on the fatigue life of the flat ring showed that the average service life of the chain flat ring applied to the scraper conveyor would be 42 050 circulations and the gearing between the sprocket and the chain link would be 84 100 times. The conclusion could have important reference significances to the structure design and optimization of the scraper chain link as well as the time references to the maintenances and replacement.
Coal Science and Technology
rain flow method