摘要
复杂煤层赋存条件下刨煤机的受力是随机变化的,这种变化直接影响刨煤机的刨削能力、生产率、工作可靠性和使用寿命。为研究刨煤机的载荷特性,基于破煤理论的刨刀受力模型,利用计算机程序模拟计算出刨刀、刨头和刨链受到的随机载荷,获得了不同刨深情况下刨刀、刨头和刨链受力的变化规律;分析了在考虑溜槽转角对刨链牵引力影响下,不同预紧力对刨链受力的影响。研究表明:刨刀与煤发生力学耦合作用而产生的交变冲击载荷中,刨刀受到的刨削阻力最大,小刨深情况下,刀体易出现磨损破坏,当刨深过大时,刨削过程中的能量积聚与释放会出现急剧的增加,使得刀体脊背处承受较高的动应力;预紧力的适当增加能减小刨链在工作过程中由于松紧交替而产生的振动;分析结果为研究动载荷作用下刨刀、刨链的可靠性和疲劳分析提供了理论依据。
The force exerted on the Plow was random under the condition of complex coal seam occurrence. These variations directly affected the planing capacity, productivity, reliability and service lifetime. In order to study the load characteristics, a computer program was used to calculate the random loads of planing tool, plow head and plow chain based on planing force model from the broken coal theory. The force variation law of planing tool, plow head and plow chain with different cutting depths were obtained. The influence of different preload forces on plow chain force were analyzed considering the effect of the chute corner angle on the plane chain traction. The research results indicated that the ploughing resistance was maximum under the alternating impact load produced by mechanical coupling. The tool body was prone to wear and tear damage under small planing depth. The energy accumulation and release in the planing process would be increased dramatically when the planing depth was too large. This situation made the back of the tool body bear high dynamic stress. The appropriate increase of pretension force could reduce the alternating elastic vibrations of plane chain in the working process. The analysis results provided the theoretical basis for reliability and fatigue analysis of planing tool and plow chain under dynamic loads.
出处
《机械设计》
CSCD
北大核心
2016年第10期55-61,共7页
Journal of Machine Design
基金
国家自然科学基金资助项目(51304105)
关键词
刨煤机
随机载荷
刨削阻力
预紧力
动应力
疲劳寿命
plow
random load
planing resistance
pretension force
dynamic stress
fatigue life
