机器人化钻锚车钻臂工作空间分析及轨迹规划

针对深部危险煤层综掘工作面事故率高、效率低的工程难题以及锚杆支护自动化、智能化需求,提出一种与智能掘支锚联合机组配套的机器人化钻锚车,并对其进行工作空间分析和轨迹规划。首先,基于D-H法建立钻锚车顶板和侧帮钻臂结构的运动学模型,基于蒙特卡洛伪随机数方法对4个钻臂进行工作空间分析;其次,针对左右钻臂协同分工作业、变位过程中避障的需求,编排顶板和侧帮钻臂的关节运动谱,基于五项式插值法得到各关节随时间的运动轨迹方程,并结合运动学模型解算各钻机末端的运动轨迹。研究结果表明:机器人化钻锚车工作空间能满足长×宽为5 500 mm×3 600 mm的试验巷道的支护要求;钻机末端轨迹到临时支护支架最小距离为100 mm,顶板钻臂和侧帮钻臂变位过程中均不会与支架发生干涉。

智能锚注一体台车钻臂运动学研究

为实现在作业过程中的钻臂自动定位,对智能锚注一体台车钻臂运动学进行研究。以钻臂机械结构为依据,运用D-H方法建立了8自由度钻臂的运动学方程。基于蒙特卡洛法分析钻臂的可达工作空间,在MATLAB中仿真出钻臂的工作空间云图和投影图。根据钻臂的结构特点和关节运动范围提出了一种钻臂运动学逆解算法。针对大断面隧道锚杆作业过程,在台车理想状态和倾斜状态下对钻臂运动学逆解算法进行验证。结果表明:(1)智能锚注一体台车钻臂可达工作空间可以满足大部分隧道施工使用需求;(2)钻臂逆运动学算法计算效率高,在台车理想状态和倾斜状态下均表现良好。

Stability influence factors analysis and construction of a deep beam anchorage structure in roadway roof

Deep beam anchorage structures based on spatial distribution analysis of the cable prestressed field have been proposed for roadway roof support, Stability and other factors that influence deep beam structures are studied in this paper using mechanical calculations, numerical analysis and field measurements, A mechanical model of deep beam structure subjected to multiple loading is established, including analysis of roof support in the return airway of S1203 working face in the Yuwu coal mine, China, The expression of maximum shear stress in the deep beam structure is deduced according to the stress superposition criterion, It is found that the primary factors affecting deep beam structure stability are deep beam thickness, cable pre-tension and cable spacing, The variation of maximum shear stress distribution and prestressed field diffusion effects according to various factors are analyzed using Matlah and FLAC3DTM software, and practical support parameters of the S1203 return airway roof are determined, According to the observations of rock pressure, there is no evidence of roof separation, and the maximum values of roof subsidence and convergence of wall rock are 72 and 48 mm, respectively, The results show that the proposed roof support design with a deep beam structure is feasible and achieves effective control of the roadway roof,

关于船舶平行靠泊的研究

基于笔者多年的引航实践和总结,本文针对船舶的平行靠泊提出了基本操作思路,并对拖轮、侧推、锚、车、舵的运用以及附加惯矩和偏转惯性等要点分别展开了深入的研究分析,为操船者提供相应的参考。