【摘要】 应用于磨煤机的磨球存在磨耗过大、破煤效率低的问题。采用扫描电子显微镜、X-射线衍射、激光共聚焦显微镜等仪器对ZQCr5磨球磨损状况进行了表征，并利用EDEM软件调整球径配比，通过煤块粘结键破坏速率、破碎作用力和衬板所承受的能量三方面进行定量比较，得出最佳方案。结果表明：硬度和韧性偏低是造成磨球损耗较高的主要原因，建议提高Cr含量并控制残余奥氏体含量来提升耐磨性。切向磨削为破碎烟煤主要方式，表面磨削磨损为磨球主要失效方式。更改磨球级配关系为Φ60 mm∶Φ30 mm∶Φ20 mm=16∶3∶1，可以使得磨球消耗同比降低35%，破碎效率提升9%，衬板的损耗大幅降低，该工作可为提升磨煤效率，降低磨球损耗提供参考。更多还原

【Abstract】 The grinding balls used in coal mills have the problems of excessive wear and low coal breaking efficiency. The wear status of ZQCr5 grinding balls was characterized by scanning electron microscopy, X-ray diffraction, laser confocal microscopy, and other instruments. The ball diameter ratio was adjusted by EDEM software. The optimal scheme was determined by a quantitative comparison of three indicators: the failure rate of the coal block bond,the crushing force, and the energy borne by the lining plate. The results showed that low hardness and toughness were the reasons for the high wear of the grinding balls. It is suggested to increase Cr content and control residual austenite content to improve wear resistance. In the process of crushing bituminous coal, the tangential grinding was the main way of crushing bituminous coal, and the surface grinding wear was the main failure mode of the grinding ball. While changing the grinding ball gradation relationship to: Φ60 mm∶Φ30 mm∶Φ20 mm=16 ∶3 ∶1,the grinding ball consumption was reduced by 35%, the crushing efficiency was increased by 9%, and the loss of the liner was greatly reduced. The work could provide the reference for improving coal grinding efficiency and reducing grinding ball loss.更多还原