摘要
为提高采煤机行走机构的力学性能,从行走轮运行中受到应力场与热场相互作用的角度,分析热固耦合下采煤机行走轮的力学特性。采用图解法计算轮齿与销齿相对滑动速度,得到行走轮稳态温度场。采用有限元法分析行走轮非热固耦合场与热固耦合场应力分布规律,对比分析热场对行走轮应力的影响。结果表明:行走轮稳态温度场最高温度为80℃,最高温度在轮齿齿宽中部,且位于分度圆附近。热固耦合场与非热固耦合场行走轮接触应力与弯曲应力分布规律基本相同,均呈周期性变化,最大接触应力位于销排节线处,最大弯曲应力位于稳定啮合阶段。热固耦合作用下的行走轮,平均接触应力增大14 MPa,增幅1.7%,平均弯曲应力增大16 MPa,增幅5.9%,接触应力平均波动率增幅10.6%。通过热场对行走轮力学特性影响的研究,为行走轮轮齿修形及优化提供了理论基础。
In order to improve the mechanical properties of the walking mechanism of the shearer,the mechanical properties of the walking wheel of the shearer under thermal-solid coupling were analyzed from the perspective of the interaction between the stress field and the thermal field during the operation of the walking wheel.Then,the relative sliding speeds of the wheel tooth and the pin tooth were calculated by the graphical method,and the steady-state temperature field of the walking wheel was obtained.At the same time,the finite element method was used to analyze the stress distribution laws of the non-thermal-solid coupling field and the thermal-solid coupling field of the walking wheel,and the influence of the thermal field on the stress of the walking wheel was compared and analyzed.The results showed that the maximum temperature of the steady-state temperature field of the walking wheel was 80 C,and it was in the middle of the tooth width and near the pitch circle.The contact stress and bending stress distributions of the walking wheel in the thermalsolid coupling field and the non-thermal-solid coupling field were basically the same,both of which changed periodically.The maximum contact stress was located at the pin-row pitch line,and the maximum bending stress was located at the stable meshing stage.Under the action of thermal-solid coupling,the average contact stress of the walking wheel increased by 14 MPa,an increase of 1.7%,the average bending stress increased by 16 MPa,an increase of 5.9%,and the average fluctuation rate of contact stress increased by 10.6%.Through the research of the influence of thermal field on the mechanical properties of the walking wheel,it provided a theoretical basis for the modification and optimization of the tooth of the walking wheel.
作者
张丹
马克洲
吴卫东
刘训涛
赵跃超
冯业瑞
ZHANG Dan;MA Kezhou;WU Weidong;LIU Xuntao;ZHAO Yuechao;FENG Yerui(School of Mechanical Engineering,Heilongjiang University of Science and Technology,Harbin 150022,Heilongjiang,China)
出处
《矿山机械》
2023年第12期57-63,共7页
Mining & Processing Equipment
基金
黑龙江省自然科学基金(LH2022E106)
黑龙江省揭榜挂帅科技攻关项目(2021ZXJ02A01)
黑龙江科技大学博士后科研启动基金(2023BSH08)。
关键词
采煤机行走轮
热固耦合场
相对滑动速度
稳态温度场
力学特性
shearer walking wheel
thermal-solid coupling field
relative sliding speed
steady-state temperature field
mechanical property
