采煤机螺旋滚筒动态截割过程研究
doi: 10.13433/j.cnki.1003-8728.20180188
Exploring Dynamic Cutting Process of Shearer's Drum
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摘要: 为研究采煤机螺旋滚筒动态截割过程动力传递规律,基于相似理论建立螺旋滚筒模型与原型的相似准则,确定了模拟螺旋滚筒结构参数、运动学参数及截割材料特性参数,应用三维实体建模软件Pro/E、离散元分析软件EDEM联合仿真分析验证原型滚筒和模型滚筒动态截割过程中煤颗粒运动轨迹、量变规律、滚筒装煤率、滚筒载荷等性能。验证结果表明:原型滚筒和模型滚筒在截割过程中煤颗粒流动轨迹一致,截落的煤分布规律相似,载荷波动规律一致,滚筒装煤率预测误差1.82%,载荷数值误差小于2.1%,装煤率和载荷均值均满足推导的相似关系,验证了螺旋滚筒相似准则正确性。
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关键词:
- 螺旋滚筒 /
- 相似理论 /
- 动态截割 /
- 离散元 /
- 装煤率
Abstract: In order to study the dynamic cutting processes and coal power transfer laws of a shearer's drum, its model drum was built based on the similarity theory; the prototype was similar to the parameters of similarity criterion. The structural parameters, movement parameters and cutting material characteristics of the drum to be simulated are determined. The Pro/E and EDEM were applied. The simulation analysis and verification of the prototype drum, the dynamic cutting process, coal particles' motion trail, quantitative change rule, coal rate and drum loading are the same. The cylinder model validation results show that the prototype drum's coal particle distributions are similar in the cutting process; the drum's coal rate prediction error is 1.82%; the loading error is less than 2.1%; the coal rate and loading are satisfactory, verifying the accuracy of the drum's similarity criterion.-
Key words:
- shearer's drum /
- similarity theory /
- dynamic cutting process /
- discrete element method /
- coaling rate
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图 1 原型滚筒和相似后滚筒
图 2 煤壁颗粒工厂
图 3 滚筒装煤仿真模型
图 4 滚筒装煤仿真状态
图 5 煤颗粒轨迹矢量图
图 6 统计区域示意
表 1 滚筒相关参数量纲
参数 符号 量纲 滚筒直径/mm D M0L1T0 螺旋叶片头数/个 Z M0L0T0 每条截线截齿数/个 m M0L0T0 叶片螺旋升角/(°) α M0L0T0 滚筒转速/(r·min-1) n M0L0T-1 牵引速度/(m·min-1) vq M0L1T-1 煤的密度/(kg·m-3) ρ M1L-3T0 齿体屈服强度/MPa σ M1L-1T-2 重力加速度/(m·s-2) g M0L1T-2 滚筒所受载荷/N F M1L1T-2 装煤率/% Q M0L0T0 表 2 量纲矩阵指数表
参数 D n vq ρ σ g F 指数 a1 a2 a3 a4 a5 a6 a7 M 0 0 0 1 1 0 1 L 1 0 1 -3 -1 1 1 T 0 -1 -1 0 -2 -2 -2 表 3 滚筒主要参数π矩阵
参数 D n vq ρ σ g F 指数 a1 a2 a3 a4 a5 a6 a7 π1 1 0 0 0 1/2 0 -1/2 π2 0 1 0 0 -1/4 -1/2 1/4 π3 0 0 1 0 1/4 -1/2 -1/4 π4 0 0 0 1 -3/2 1 1/2 表 4 滚筒相关参数相似系数
参数 原型 模型 滚筒直径/mm D D/3 螺旋叶片头数/个 Z Z 每条截线截齿数/个 m m 叶片螺旋升角/(°) α α 滚筒转速/(r·min-1) n 牵引速度/(m·min-1) vq 煤的密度/(kg·m-3) ρ ρ 齿体屈服强度/MPa σ σ/3 重力加速度/(m·s-2) g g 滚筒所受载荷/N F F/27 装煤率/% Q Q 表 5 滚筒主要结构参数
参数 原型 模型 滚筒直径/mm 1 150 383 圆柱段长度/mm 700 233 筒毂直径/mm 530 176 筒毂内径/mm 460 153 螺旋叶片外缘直径/mm 930 310 叶片厚度/mm 70 23 圆柱段截线条数/条 11 11 截线距/mm 67 22 轴向倾斜角/(°) 0 0 安装角/(°) 40 40 叶片螺旋升角/(°) 13 13 螺旋叶片头数/个 2 2 每条截线截齿数/个 2 2 尾片与半个齿座距离和/mm 50 17 表 6 煤的物理力学性质指标
真密度/(kg·m-3) 视密度/(kg·m-3) 抗拉强度/MPa 抗压强度/MPa 弹性模量/MPa 坚固性系数 1 332 1 309 1.08 17.71 4 388 2.0 表 7 滚筒装煤仿真结果统计
煤颗粒数/个 装煤率/% 统计区Ⅰ 统计区Ⅱ 原型 5 703 10 038 63.77 模型 290 537 64.93 表 8 载荷数值结果
方向 原型滚筒 模型滚筒 相似预测滚筒载荷均值/N 误差/% 滚筒载荷均值/N 载荷波动系数 滚筒载荷均值/N 载荷波动系数 X 95 247.6 0.026 6 3 589.4 0.027 2 3 527.7 1.75 Y 1 152.1 0.031 4 44.3 0.032 3 42.7 3.74 Z 74 769.5 0.029 5 2 829.5 0.030 6 2 769.2 2.04 PHP网站源码松岗模板制作石岩外贸网站设计大运模板推广宝安品牌网站设计广州seo网站推广沙井百姓网标王推广布吉百度竞价包年推广宝安SEO按效果付费龙华网站优化按天扣费同乐网络广告推广广州网页设计松岗网页设计坑梓网络推广双龙网站优化盐田网站推广工具西乡网站优化推广福田SEO按效果付费民治企业网站改版福田seo网站优化坪地优秀网站设计南山关键词排名包年推广坂田网站推广系统坪地营销网站南联品牌网站设计松岗关键词按天计费罗湖企业网站建设双龙SEO按天计费丹竹头SEO按天收费塘坑百度关键词包年推广石岩关键词排名包年推广歼20紧急升空逼退外机英媒称团队夜以继日筹划王妃复出草木蔓发 春山在望成都发生巨响 当地回应60岁老人炒菠菜未焯水致肾病恶化男子涉嫌走私被判11年却一天牢没坐劳斯莱斯右转逼停直行车网传落水者说“没让你救”系谣言广东通报13岁男孩性侵女童不予立案贵州小伙回应在美国卖三蹦子火了淀粉肠小王子日销售额涨超10倍有个姐真把千机伞做出来了近3万元金手镯仅含足金十克呼北高速交通事故已致14人死亡杨洋拄拐现身医院国产伟哥去年销售近13亿男子给前妻转账 现任妻子起诉要回新基金只募集到26元还是员工自购男孩疑遭霸凌 家长讨说法被踢出群充个话费竟沦为间接洗钱工具新的一天从800个哈欠开始单亲妈妈陷入热恋 14岁儿子报警#春分立蛋大挑战#中国投资客涌入日本东京买房两大学生合买彩票中奖一人不认账新加坡主帅:唯一目标击败中国队月嫂回应掌掴婴儿是在赶虫子19岁小伙救下5人后溺亡 多方发声清明节放假3天调休1天张家界的山上“长”满了韩国人?开封王婆为何火了主播靠辱骂母亲走红被批捕封号代拍被何赛飞拿着魔杖追着打阿根廷将发行1万与2万面值的纸币库克现身上海为江西彩礼“减负”的“试婚人”因自嘲式简历走红的教授更新简介殡仪馆花卉高于市场价3倍还重复用网友称在豆瓣酱里吃出老鼠头315晚会后胖东来又人满为患了网友建议重庆地铁不准乘客携带菜筐特朗普谈“凯特王妃P图照”罗斯否认插足凯特王妃婚姻青海通报栏杆断裂小学生跌落住进ICU恒大被罚41.75亿到底怎么缴湖南一县政协主席疑涉刑案被控制茶百道就改标签日期致歉王树国3次鞠躬告别西交大师生张立群任西安交通大学校长杨倩无缘巴黎奥运
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