本文關(guān)鍵詞： 螺旋鉆桿 離散元 結(jié)構(gòu)設(shè)計 鉆桿接頭 力學(xué)特性 有限元　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文對鉆機履帶車體、主機、操縱臺、泵站這四大模塊進行了介紹,針對煤礦坑道的特殊環(huán)境對鉆機的性能做出了分析。通過對圓柱鉆桿、螺旋鉆桿、肋骨鉆桿、三棱鉆桿的優(yōu)缺點進行對比,并對其鉆桿接頭形式作出分析,得到螺旋鉆桿排粉效率最高,六方插接式接頭具有較高的可靠性。針對螺旋鉆桿的受力特征,本文建立了螺旋鉆桿排粉的力學(xué)模型,并應(yīng)用理論分析方法研究螺旋鉆桿煤孔壁內(nèi)輸運特性。應(yīng)用離散元軟件EDEM對螺旋鉆桿在外圍直徑、葉片高度、中心桿直徑一定,螺距分別為100.0mm、90.9mm、80.3mm的情況下進行排粉特性研究。通過仿真得到:螺距為100.0mm時煤粉顆粒對螺旋葉片的作用力最大;螺距為80.3mm時煤粉顆粒移動的平均位移最大;螺距為90.9mm時排粉平均速度最大。結(jié)合實際情況,本文優(yōu)先推薦排粉效率最高的鉆桿應(yīng)用于實際生產(chǎn),其螺距為90.9mm。本文對螺旋鉆桿接頭進行了改進設(shè)計,得到一種新型插接式接頭。建立了接頭受拉力學(xué)模型,能精確的計算出接頭的受拉力學(xué)特性。應(yīng)用ABAQUS軟件建立接頭有限元模型,分析接頭在承受不同軸向拉力下的力學(xué)特性。從分析結(jié)果可以得到:在鎖舌與母接頭接觸面處應(yīng)力達到最大,公接頭圓孔處與鎖舌相互作用面處應(yīng)力也較大,未發(fā)生塑性變形。通過拉力試驗,當(dāng)載荷增大到150KN時接頭未發(fā)生破壞。實驗結(jié)果表明接頭在反復(fù)插接過程中均能快速對接,性能達到實際要求,由于母接頭壁厚較薄,在承受拉力時容易發(fā)生疲勞破壞,在使用過程中母接頭應(yīng)該經(jīng)常檢查。本文討論了鉆桿接頭的加工工藝,因沖壓工藝具有較高的生產(chǎn)效率,加工成本低等優(yōu)點,故其普遍應(yīng)用于接頭制造過程中。建立了六方接頭受扭力學(xué)模型,通過強度校核公式計算出母接頭最大剪切應(yīng)力為235.5MPa。接頭受扭仿真結(jié)果表明;母接頭的最大Mises等效應(yīng)力為257.5MPa且發(fā)生在內(nèi)部兩個表面過渡處,其計算與仿真之間的誤差為9%,計算與仿真相互驗證;公母接頭在傳遞扭矩時只有一部分區(qū)域發(fā)生接觸并傳遞扭矩,其余部分沒有直接接觸不是主要傳遞扭矩區(qū)域;在反復(fù)受扭狀態(tài)下母接頭應(yīng)力是公接頭應(yīng)力的2.34倍,母接頭容易先發(fā)生破壞,所以在材料上應(yīng)優(yōu)先對母接頭進行強化。還需要對公、母接頭的結(jié)構(gòu)進一步優(yōu)化,使其在整個接觸面上都可以傳遞扭矩。最后,對接頭進行扭矩實驗結(jié)果驗證了仿真結(jié)果的正確性,六方接頭可以傳遞較大的扭矩而不發(fā)生破壞,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.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD42

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