Theoretical and Experimental Study of Optimal Cutting Thickness of Short Helix Bit while Drilling the Rock
-
摘要: 根据岩石的物理力学特性和截齿的破岩机理,建立了单个镐型截齿破岩时受力的数学模型;在此基础上,对安装12个镐型截齿的短螺旋钻头进行整体受力分析,并建立钻头扭矩的数学模型,结合旋挖钻机恒功率钻进的特点,得到钻头转速的数学表达式,从而求得钻头钻进速度关于切削厚度和岩石接触强度的关系式。针对几种不同接触强度的岩层,运用Matlab程序分别求得钻机在不同切削厚度下的钻进速度,并与同等条件下的实验数据相比较。结果表明:若切削厚度过小,钻机钻速达不到最大,钻进效率偏低;若切削厚度过大,钻机提供的扭矩因无法克服负载(即钻速为零),导致钻机损伤。Abstract: According to the physical and mechanical characteristics of rock,combining with the working principle of the conical bit while cutting rock,the mathematical model of single conical bit was built.And it was applied in the whole force analysis of the short helix bit with twelve conical bits and the mathematical model of short helix bit's torque was built.Also the mathematical expression of rotary speed of short helix bit was obtained because the power of the hydraulic piling rig is constant while drilling rock.Grounded on all these above,it can be deducted to a relational expression among drilling speed,cutting thickness and contact strength of rock.In accordance with rock stratum of different contact strength,drilling speed of the machine with different cutting thickness were got by Matlab program,which were compared with those statistics from the practical test under the same condition.From the results,it can be concluded as following: the excessively small cutting thickness will lead to low drilling efficiency because drilling speed isn't maximum,and excessively big cutting thickness will lead to the damage of the machine for the torques can't get over the load(drilling speed is zero).
-
Key words:
- hydraulic piling rig /
- helix bit /
- cutting thickness /
- efficiency
-
[1] 王景祥. 旋挖钻机及其施工工法[J].建筑机械,2010,(08):57-59. [2] 黎中银,王宏伟,解大鹏. 旋挖钻机入岩机理和钻岩效率的分析[J].建筑机械,2008,(01):73-77. [3] Evans I. A theory of the cutting force for point-attack picks[J].International Journal of Mining Engineering,1984,(02):63-71. [4] 雷玉勇,李晓红. 刀形截齿截割阻力的理论和试验研究[J].煤矿机械,1999,(10):13-15. [5] 王琦,李贵轩. 镐齿截割煤断裂模式研究[J].辽宁工程技术大学学报,2004,(02):247-249. [6] 屠厚泽,高森. 岩石破碎学[M].北京:地质出版社,1990. [7] 别隆,王兴祚. 煤炭切削原理[M].北京:中国工业出版社,1965. [8] E.3保晋,B.3拉麦德,B.B顿,王庆康,门迎春. 采煤机破煤理论[M].北京:煤炭工业出版社,1992. [9] Bilgin N,Demirchin M A,Copur H. Dominant rock properties affecting the performance of conical picks and the comparison of some experimental and theoretical results[J].International Journal of Rock Mechanics & Mining Sciences & Geomechanics Abstracts,2006,(01):139-156. [10] Liu S Y,Du C L,Cui X X. Research on the cutting force of a pick[J].Mining Science and Technology,2009,(04):514-517. [11] Mustafa Eyyuboglu E,Bolukbasi N. Effects of circumferenti',fl pick spacing on boom type roadheader cutting head performance[J].Tunnelling and Underground Space Technology,2005.418-425. [12] 沙永东. 纵轴式掘进机截割不同对象的载荷模拟及优化设计[D].阜新:辽宁工程技术大学,2007. [13] 何素梅,李晓豁. 半煤岩巷掘进机截割过程的计算机模拟[J].黑龙江矿业学院学报,1999,(09):6-9. [14] 李晓豁,姜丽丽. 掘进机截割硬岩的载荷模拟研究[J].中国工程机械学报,2008,(04):415-417. -
![WeChat](/fileJXKXYJS/journal/article/jxkxyjs/2012/11/PIC/wechat_cn_5471.jpg)
计量
- 文章访问数: 235
- HTML全文浏览量: 49
- PDF下载量: 13
- 被引次数: 0