Design and dynamic analysis of the scissor deployable mechanism used in the drill for replicating ice cores from the borehole wall

Zhuo Chen, Pinlu Cao, Guoqing Cui, Han Wang, Qilei Yin
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Abstract

The deep ice cores preserved within the polar ice sheets hold a wealth of valuable information, and the demand for ice cores in related scientific research is on the rise. Thus, the replication of ice cores from the borehole wall holds significant importance. However, current methods face limitations such as difficulties in whipstock retrieval, extended auxiliary working hours, structural complexity, and the necessity of ice core depth calibration. To address this, this study proposes a novel method for replicating ice cores from the borehole wall utilizing a thermal coring drill bit. The design and dynamic analysis of the scissor deployable mechanism employed to drive the drill bit movement were thoroughly examined through theoretical and simulation studies. The motion characteristics of the drill bit during the replication coring process and the stress–strain behavior of the scissor rods were determined and validated through drill bit movement experiments, demonstrating a maximum error of 10%. The findings reveal that the mechanism can meet the strength requirements across three operating stages: horizontal drilling, vertical coring, and ice core recovery, with maximum loads of approximately 284 N, 749 N, and 970 N, respectively. Increasing the thickness of the scissor rods and reducing their length can augment the load-bearing capacity of the structure. Additionally, the speed transmission characteristics derived from the scissor mechanism can offer theoretical support for the drill's control system.
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设计并动态分析用于从钻孔壁复制冰岩芯的钻机中使用的剪刀式可展开机构
保存在极地冰原中的深冰芯蕴藏着大量宝贵的信息,相关科学研究对冰芯的需求也在不断增加。因此,从钻孔壁复制冰芯具有重要意义。然而,目前的方法面临着一些限制,如鞭子取样困难、辅助工作时间延长、结构复杂以及必须进行冰芯深度校准等。为此,本研究提出了一种利用热取心钻头从井壁复制冰芯的新方法。通过理论和模拟研究,对用于驱动钻头运动的剪刀式可展开机构的设计和动态分析进行了深入研究。通过钻头运动实验,确定并验证了复制取心过程中钻头的运动特性和剪刀杆的应力应变行为,结果表明最大误差为 10%。研究结果表明,该机构可以满足水平钻探、垂直取芯和冰芯回收三个作业阶段的强度要求,最大载荷分别约为 284 N、749 N 和 970 N。增加剪刀杆的厚度并缩短其长度可以提高结构的承载能力。此外,剪刀机构的速度传输特性也可为钻机控制系统提供理论支持。
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