刨刀刨削煤岩特性数值模拟研究

Numerical simulation study on coal and rock ploughing and planing features of plough cutters

为了探索薄煤层刨煤机刨刀刨削煤岩的破碎过程及其力学特性,基于有限元数值仿真分析方法分析煤岩截割过程的显示动力特性。依据煤岩三向应力测试试验,构建出基于Drucker Prager准则的煤岩本构模型。以煤岩刨削截深、煤岩刨削速度、刨刀前角为水平因素设计单因素仿真分析试验,实现煤岩破碎形态与刨刀煤岩截割力的研究。研究结果表明:煤屑块度与煤岩刨削截深有关,随着截深的增大,块度增大;随着刨削速度的增加,煤屑的块度变化趋势不明显,煤岩在α=30°刨刀作用下,截割剥离煤屑块度较大;刨刀煤岩截割负载随着截深的增大而增大;随着转速与截割深度的增加,前角为30°的刨刀负载呈线性上升趋势。

In order to discover the breaking process and the dynamics features of the coal and rock ploughing and planing by the plough cutters of the thin seam plough, based on the finite element numerical simulation analysis method, an analysis was conducted on the ex- plicit dynamic during the coal and rock cutting process. According to the 3D stress measurement and test of the coal and rock, a coal and rock constitutive model was established based on the Drucker Prager criterion. An analysis and test of single factor simulation was designed with the coal and rock ploughing and planing depth, the coal and rock ploughing and planing speed and the front angle of the plough cutter as the horizontal factor and a study was realized on the coal and rock breaking mode and the coal and rock cutting force of the plough cutter. The study results showed that the coal cutting lump size was related to the coal and rock ploughing and planing depth and with the depth increased, the lump size would be increased. With the ploughing and planing speed increased, the variation tendency of the coal lump size was not obvious. Under the α= 30° plough cutter role of the coal and rock, the coal cutting and planing lump size was large. The coal and rock cutting load of the plough cutter would be increased with the depth increased. With the rotary speed and cutting depth increased, the load of the plough with the front angle of 30° was in a linear rising tendency.