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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2016 Vol.17 No.5 P.353-365
Basic parameters of the static stability, loads and strength of the vital parts of a bucket wheel excavator’s slewing superstructure
Abstract: Determining a bucket wheel excavator (BWE)’s slewing superstructure weight and its center of gravity (COG) is of extreme importance not only in the design phase, but also after the completion of the erection process and during the operation of the machine. This paper presents a critical comparative analysis of the basic parameters of the static stability of a BWE 1600 superstructure, with the parameters being obtained by both analytical and experimental procedures. The analysis shows that a relatively small difference in superstructure mass, obtained by calculation, leads to a relatively large unfavorable shifting of its COG, necessitating a significant increase in counterweight mass for balancing. A procedure for superstructure 3D model mass correction is presented based on results obtained by weighing after the completion of the erection process. The developed model provides enough accuracy to determine the superstructure’s COG in the entire domain of the bucket wheel boom inclination angle, and enables accurate load analysis of the superstructure’s vital parts. The importance of this analysis is reinforced by the finding that the procedure prescribed by standard DIN 22261-2 gives results which are not on the side of safety, as shown by an example of strength analysis of a bucket wheel boom stays’ end eyes.
Key words: Bucket wheel excavator (BWE), Slewing superstructure, Parameters of the static stability, Loads, Strength
方法:1. 分析比较由数值模拟和实验得到的静态稳定性基本参数;2. 构建上部结构的3D模型(图1~3),并根据斗轮挖掘机组装完成后的重量分布对模型进行质量修正;3. 对上部结构进行负载和应力分析。
结论:1. 上部结构一个较小的质量变化(1.5%)会导致重心位置一个较大的变化(902 mm),从而不得不明显增加配重的重量(24 t)来保持平衡;2. 构建的3D模型可以得到精确的上部结构重量分布和重心位置;3. 由DIN 22261-2标准规定的眼板应力被证明并不安全。
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DOI:
10.1631/jzus.A1500037
CLC number:
TD422
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On-line Access:
2024-08-27
Received:
2023-10-17
Revision Accepted:
2024-05-08
Crosschecked:
2016-04-07