镐型截齿不同截割速度对煤岩截割过程影响研究  

Research on the influence of various cutting speeds of conical pick on coal cutting process

作　　者：刘晋霞 咸方新[2] 张超 LIU Jinxia;XIAN Fangxin;ZHANG Chao(College of Transportation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Mechanical and Electrical Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学交通学院,山东青岛266590 [2]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2022年第1期66-74,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东省自然科学基金项目(ZR2020ME085);山东省矿山机械工程重点实验室开放基金项目(2019KLMM204)。

摘　　要：采煤机工作过程中,镐型截齿直接截割煤岩,其截割速度影响其寿命,同时也对采煤机工作效率具有重要影响。本研究在分析镐型截齿截割过程中截割速度变化的基础上,利用颗粒流离散元软件(PFC)对不同截割速度对煤岩截割过程的影响开展研究。结果表明:煤岩截割过程中,镐型截齿截割速度总体呈非线性减小趋势,且随牵引速度、滚筒角速度的增大分别呈现非线性减小趋势增强和明显增大的特点;当滚筒角速度、牵引速度一定时,截割过程中截割力均值、峰值、最大波动及产生的裂纹数量均随牵引速度、滚筒角速度的增大分别增大、减小;牵引速度一定时,提高滚筒角速度可改善截齿的受力情况;滚筒角速度一定时,提高牵引速度可在一定程度上降低截割比能耗。Because the conical pick cuts coal directly in the working process of shearers,the cutting speed not only affects the life of conical pick but also has an important influence on the working efficiency of shearers.Based on the analysis of cutting speed changes in the cutting process,the influence of various cutting speeds of conical pick on the cutting process was studied by simulation in particle flow discrete element software(PFC).The results show that the cutting speeds of conical pick in the process of cutting coal presents a non-linear decrease trend,and that the non-linear decrease trend increases with the increase of traction speed while the cutting speed increases obviously with the increase of drum angular velocity.When the drum angular velocity and traction speed are constant,the mean,peak and maximum fluctuation of the cutting force as well as the number of generated cracks show the trend of increase with the increase of traction speed and the trend of decrease with the increase of drum angular velocity.When the traction speed is constant,the force of conical pick can be ameliorated by increasing the drum angular velocity.When the drum angular velocity is constant,the cutting specific energy consumption can be reduced by increasing the traction speed to a certain extent.

关 键 词：镐型截齿 截割速度 截割过程 离散元 颗粒流 

分 类 号：TD42[矿业工程—矿山机电]