【摘要】：隨著綜采設(shè)備工作環(huán)境復(fù)雜性的增大,乳化液泵的性能也隨之提高,即大流量、高壓、結(jié)構(gòu)緊湊。曲軸作為乳化液泵的關(guān)鍵零部件之一,將旋轉(zhuǎn)運動轉(zhuǎn)化為往復(fù)直線運動。在曲軸的工作過程中,其工況復(fù)雜,承受著由周期性的交變載荷所帶來的復(fù)雜扭轉(zhuǎn)應(yīng)力和彎曲應(yīng)力,所以在一定程度上極易造成曲軸的變形和工作失效。因此曲軸的可靠性直接影響到乳化液泵的穩(wěn)定性和安全性。由此可見,如何準(zhǔn)確的分析計算曲軸危險截面處的應(yīng)力應(yīng)變,以及對這些危險部位如何進(jìn)行結(jié)構(gòu)優(yōu)化,這已經(jīng)成為曲軸結(jié)構(gòu)設(shè)計的重要問題。實踐表明,某系三拐四支撐乳化液泵曲軸運行時出現(xiàn)失效,因此本文以該曲軸為研究對象,分析有關(guān)曲軸在裝配存在偏心和不存在偏心的條件下,不同工況的結(jié)構(gòu)強度及改進(jìn)的問題。首先,對乳化液泵的曲軸系在理論上進(jìn)行運動學(xué)分析和動力學(xué)分析,推導(dǎo)出有關(guān)柱塞、連桿和曲軸的相關(guān)運動方程及受力公式。其次,利用三維建模軟件Pro/e對乳化液泵曲軸系的各個部件進(jìn)行三維建模并裝配。將裝配好的曲軸系模型導(dǎo)入到Ansys workbench12的多體動力學(xué)模塊,進(jìn)行曲軸的運動學(xué)和動力學(xué)仿真分析,得到了柱塞的位移和速度曲線圖以及各個曲拐與連桿之間的相互作用力。再次,利用有限元軟件Ansys workbench12的靜力分析模塊和瞬態(tài)動力學(xué)模塊對曲軸整體進(jìn)行分析,分析計算其不同工況下的曲軸應(yīng)力應(yīng)變,并且得出了應(yīng)力值最大的工況及位置。最后,對曲軸進(jìn)行模態(tài)分析,得出了不同階次的振型。最終根據(jù)計算的曲軸應(yīng)力最大值進(jìn)行結(jié)構(gòu)尺寸優(yōu)化,使曲軸結(jié)構(gòu)強度滿足設(shè)計要求。通過對曲軸的一系列分析計算,得到了一些相關(guān)的數(shù)據(jù),這為曲軸結(jié)構(gòu)以及乳化液泵整機(jī)結(jié)構(gòu)的改進(jìn)和進(jìn)一步的優(yōu)化升級提供理論依據(jù)。
[Abstract]:With the increasing complexity of the working environment of fully mechanized coal mining equipment, the performance of emulsion pump is improved, that is, large flow rate, high pressure and compact structure. As one of the key parts of emulsion pump, crankshaft transforms rotation motion into reciprocating linear motion. In the working process of crankshaft, its working condition is complex, bearing complex torsional stress and bending stress caused by periodic alternating load, so it is easy to cause deformation and working failure of crankshaft to a certain extent. Therefore, the reliability of crankshaft directly affects the stability and safety of emulsion pump. Therefore, how to accurately analyze and calculate the stress and strain at the dangerous section of crankshaft and how to optimize the structure of these dangerous parts has become an important problem in the design of crankshaft structure. The practice shows that the crankshaft of a series of three-crank and four-braced emulsion pump appears to be invalid in operation, so this paper takes the crankshaft as the research object, and analyses the condition that the crankshaft has eccentricity and does not exist eccentricity in assembly. Structural strength under different working conditions and problems of improvement. Firstly, the kinematics and dynamics of the crankshaft system of the emulsion pump are analyzed theoretically, and the equations of motion and the force formula of the plunger, connecting rod and crankshaft are deduced. Secondly, the 3D modeling software Pro/e is used to model and assemble the components of the crankshaft system of emulsion pump. The assembled crankshaft system model is introduced into the multi-body dynamics module of Ansys workbench12 and the kinematics and dynamics simulation analysis of crankshaft is carried out. The displacement and velocity curves of plunger and the interaction forces between each crank and connecting rod are obtained. Thirdly, the static analysis module and the transient dynamic module of the finite element software Ansys workbench12 are used to analyze the whole crankshaft, and the stress and strain of the crankshaft under different working conditions are analyzed and calculated, and the working condition and position of the maximum stress value are obtained. Finally, the modal analysis of the crankshaft is carried out, and the vibration modes of different order are obtained. Finally, the structure size is optimized according to the calculated maximum stress of crankshaft, so that the structural strength of crankshaft meets the design requirements. Through a series of analysis and calculation of the crankshaft, some relevant data are obtained, which provides a theoretical basis for the improvement of the crankshaft structure and the structure improvement and further optimization and upgrading of the whole machine structure of the emulsion pump.
【學(xué)位授予單位】：西安工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD40

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相關(guān)期刊論文 前1條

1 馬建鋒,余利祺;LRB400/31.5型大流量乳化液泵站[J];煤礦機(jī)電;2001年05期

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本文編號：2331553