矿用坑道钻机以及配套钻具关键技术研究

发布时间：2018-03-01 03:07

本文关键词： 螺旋钻杆离散元结构设计钻杆接头力学特性有限元　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文对钻机履带车体、主机、操纵台、泵站这四大模块进行了介绍,针对煤矿坑道的特殊环境对钻机的性能做出了分析。通过对圆柱钻杆、螺旋钻杆、肋骨钻杆、三棱钻杆的优缺点进行对比,并对其钻杆接头形式作出分析,得到螺旋钻杆排粉效率最高,六方插接式接头具有较高的可靠性。针对螺旋钻杆的受力特征,本文建立了螺旋钻杆排粉的力学模型,并应用理论分析方法研究螺旋钻杆煤孔壁内输运特性。应用离散元软件EDEM对螺旋钻杆在外围直径、叶片高度、中心杆直径一定,螺距分别为100.0mm、90.9mm、80.3mm的情况下进行排粉特性研究。通过仿真得到:螺距为100.0mm时煤粉颗粒对螺旋叶片的作用力最大;螺距为80.3mm时煤粉颗粒移动的平均位移最大;螺距为90.9mm时排粉平均速度最大。结合实际情况,本文优先推荐排粉效率最高的钻杆应用于实际生产,其螺距为90.9mm。本文对螺旋钻杆接头进行了改进设计,得到一种新型插接式接头。建立了接头受拉力学模型,能精确的计算出接头的受拉力学特性。应用ABAQUS软件建立接头有限元模型,分析接头在承受不同轴向拉力下的力学特性。从分析结果可以得到:在锁舌与母接头接触面处应力达到最大,公接头圆孔处与锁舌相互作用面处应力也较大,未发生塑性变形。通过拉力试验,当载荷增大到150KN时接头未发生破坏。实验结果表明接头在反复插接过程中均能快速对接,性能达到实际要求,由于母接头壁厚较薄,在承受拉力时容易发生疲劳破坏,在使用过程中母接头应该经常检查。本文讨论了钻杆接头的加工工艺,因冲压工艺具有较高的生产效率,加工成本低等优点,故其普遍应用于接头制造过程中。建立了六方接头受扭力学模型,通过强度校核公式计算出母接头最大剪切应力为235.5MPa。接头受扭仿真结果表明;母接头的最大Mises等效应力为257.5MPa且发生在内部两个表面过渡处,其计算与仿真之间的误差为9%,计算与仿真相互验证;公母接头在传递扭矩时只有一部分区域发生接触并传递扭矩,其余部分没有直接接触不是主要传递扭矩区域;在反复受扭状态下母接头应力是公接头应力的2.34倍,母接头容易先发生破坏,所以在材料上应优先对母接头进行强化。还需要对公、母接头的结构进一步优化,使其在整个接触面上都可以传递扭矩。最后,对接头进行扭矩实验结果验证了仿真结果的正确性,六方接头可以传递较大的扭矩而不发生破坏,具有可靠的安全性能。
[Abstract]:This paper introduces the four modules of drilling rig caterpillar, main engine, operating platform and pumping station, and analyzes the performance of drilling rig in the special environment of coal mine tunnel. The advantages and disadvantages of triangulation drill pipe are compared, and the form of drill pipe joint is analyzed. The results show that the screw drill pipe has the highest efficiency of powder discharge, and the hexagonal plug joint has higher reliability. In this paper, the mechanical model of screw drill pipe discharging powder is established, and the transport characteristics of spiral drill pipe in coal hole wall are studied by using theoretical analysis method. The diameter of spiral drill pipe in peripheral diameter, blade height and center stem diameter is fixed by using discrete element software EDEM. The characteristics of pulverized coal removal were studied when the pitch was 100.0mm / 90.9mm / 80.3mm respectively. The results of simulation showed that when the pitch was 100.0mm, the average displacement of pulverized coal particles was the largest when the pitch was 100.0mm, and the average displacement of pulverized coal particles was the largest when the pitch was 80.3mm. The average speed of powder removal is the largest when the pitch is 90.9 mm. In combination with the actual situation, this paper first recommends that the drill pipe with the highest discharging efficiency should be used in actual production, and its pitch is 90.9 mm. The improved design of screw drill pipe joint is carried out in this paper. A new type of plug joint is obtained. The tensile mechanics model of the joint is established, and the tensile mechanical characteristics of the joint can be calculated accurately. The finite element model of the joint is established by using ABAQUS software. The mechanical properties of the joint under different axial tensile forces are analyzed. From the results of the analysis, it can be concluded that the stress at the contact surface between the locking tongue and the mother joint reaches the maximum, and the stress at the circular hole of the male joint is also larger at the interaction surface of the lock tongue. No plastic deformation occurred. By tensile test, the joints did not break when the load increased to 150KN. The experimental results show that the joints can be docked quickly in the process of repeated insertion, and the performance meets the actual requirements. It is easy to take place fatigue damage when bearing tensile force, and the mother joint should be inspected frequently in the process of using. The processing technology of drill pipe joint is discussed in this paper, because the stamping process has the advantages of high production efficiency and low processing cost, etc. So it is widely used in the process of joint manufacture. The torsion model of hexagonal joint is established, and the maximum shear stress of the master joint is calculated by strength checking formula, and the result of torsion simulation shows that the maximum shear stress is 235.5MPa. The maximum Mises equivalent stress of the master joint is 257.5 MPA and occurs at two internal surface transitions. The error between the calculation and simulation is 9. The calculation and simulation verify each other, and only one part of the contact and torque transfer occurs in the transmission torque of the male and female joints. The stress of the master joint is 2.34 times that of the common joint under repeated torsion, and the master joint is liable to damage first. Therefore, priority should be given to the reinforcement of the parent joints in materials. The structure of the male and female joints should also be further optimized so that they can transmit torque throughout the contact surface. Finally, The correctness of the simulation results is verified by the torque test results of the joints. The hexagonal joints can transmit large torque without damage and have reliable safety performance.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD42

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