發(fā)布時(shí)間：2018-05-10 05:21

  本文選題：圓振動弛張篩 + 動力學(xué)模型��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：煤炭是我國的基礎(chǔ)能源和重要的工業(yè)原料,有力支撐了國民經(jīng)濟(jì)的發(fā)展,煤炭的清潔、高效利用也一直是煤炭分選的重要課題。振動篩分設(shè)備是煤炭分選流程的重要組成設(shè)備,其工作性能是煤炭能否實(shí)現(xiàn)高效分選的關(guān)鍵。但是由于煤層滲水、防塵噴水等原因,導(dǎo)致原煤含有較多外在水分,一般振動篩已經(jīng)很難勝任分選工作,潮濕細(xì)粒煤的直接篩分技術(shù)一直沒有得到有效地解決。針對以上問題,本文在圓振動篩的基礎(chǔ)上,根據(jù)動力學(xué)原理,提出了圓振動弛張篩,并以篩面弛張?jiān)頌榛A(chǔ),設(shè)計(jì)了圓振動弛張篩的整體結(jié)構(gòu)。基于Lagrange方程,建立了圓振動弛張篩的三自由度動力學(xué)模型,并求出解析解,闡明了其進(jìn)行振動篩分的機(jī)理,并以此為根據(jù),選取了相關(guān)的動力學(xué)參數(shù)。利用ADAMS構(gòu)建圓振動弛張篩的虛擬樣機(jī)模型,對其進(jìn)行多體動力學(xué)仿真,分析其動力學(xué)特性,驗(yàn)證了理論模型及解析計(jì)算的正確性。建立圓振動弛張篩的三維模型,對其進(jìn)行有限元分析,通過模態(tài)分析,得出其各階模態(tài)及振型,有效規(guī)避了對其平穩(wěn)工作較為不利的模態(tài),并為諧響應(yīng)分析奠定基礎(chǔ);進(jìn)行靜力學(xué)和諧響應(yīng)分析,研究圓振動弛張篩的頻響特性及等效應(yīng)力,并據(jù)此對其關(guān)鍵部位進(jìn)行強(qiáng)度校核。鑒于普通弛張篩篩面易損壞的缺點(diǎn),提出一種新型結(jié)構(gòu)的彈性篩面,并對新型篩面及普通篩面進(jìn)行有限元對比分析,得出新型篩面無應(yīng)力集中現(xiàn)象,受力更均衡的結(jié)論,為彈性篩面的結(jié)構(gòu)優(yōu)化及延長使用壽命提供思路。制作圓振動弛張篩的中試樣機(jī),通過進(jìn)行空載工況和帶料工況下的動力學(xué)實(shí)驗(yàn),對其振動位移信號及動力學(xué)參數(shù)進(jìn)行研究。通過對比主篩體和浮動框的水平位移信號,分析其實(shí)現(xiàn)弛張?jiān)淼南鄬ξ灰萍捌淇臻g軌跡等數(shù)據(jù);通過對比主篩體上不同測點(diǎn)的豎直位移信號,分析其運(yùn)動穩(wěn)定性;通過測試不同激振頻率下的主篩體及浮動框水平位移,尋找可以更好實(shí)現(xiàn)篩分工作的激振頻率。
[Abstract]:Coal is the basic energy and important industrial raw material in our country. It can support the development of national economy. The clean and efficient utilization of coal is always an important task of coal separation. Vibrating screen separation equipment is an important part of coal separation process, and its working performance is the key to the efficient separation of coal. However, due to coal seams seepage and dustproof water injection, the raw coal contains more external water, the general vibrating screen has been very difficult to do the sorting work, and the direct screening technology of wet fine coal has not been effectively solved. In view of the above problems, based on the circular vibrating screen, according to the dynamic principle, the circular vibration relaxation screen is put forward, and the integral structure of the circular vibration relaxation screen is designed on the basis of the screen surface relaxation principle. Based on the Lagrange equation, a dynamic model of three degrees of freedom for a circular vibrating relaxation screen is established, an analytical solution is obtained, and the mechanism of carrying out the vibrating screen is clarified. Based on this, the relevant dynamic parameters are selected. The virtual prototype model of circular vibration relaxation screen is constructed by using ADAMS. The multi-body dynamics simulation is carried out and its dynamic characteristics are analyzed. The correctness of the theoretical model and analytical calculation is verified. The three-dimensional model of circular vibration relaxation screen is established, and the finite element analysis is carried out. Through modal analysis, the modes and modes of each order are obtained, which effectively avoid the more unfavorable modes to its smooth operation, and lay the foundation for harmonic response analysis. The frequency response characteristics and equivalent stress of circular vibration relaxation screen were studied by statically harmonious response analysis, and the strength of the key parts was checked accordingly. In view of the defect that the common relaxation screen surface is easy to be damaged, a new type of elastic screen surface is proposed, and the finite element contrast analysis between the new type screen surface and the ordinary screen surface is carried out, and the conclusion is drawn that the new type screen surface has no stress concentration phenomenon and the force is more balanced. It provides ideas for structural optimization and extension of service life of elastic sieve surface. The vibration displacement signal and dynamic parameters of circular vibrating relaxation screen were studied by dynamic experiments under no-load and strip conditions. By comparing the horizontal displacement signals of the main screen body and the floating frame, the relative displacement and the space track of the relaxation principle are analyzed, the vertical displacement signals of different measuring points on the main screen body are compared, and its motion stability is analyzed. By measuring the horizontal displacement of the main sieve and the floating frame at different exciting frequencies, the exciting frequency of sieving can be better realized.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD452

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