本文選題：粉碎機(jī)　切入點(diǎn)：數(shù)值模擬　出處：《內(nèi)蒙古科技大學(xué)》2015年碩士論文

【摘要】：錘片式粉碎機(jī)改變了傳統(tǒng)的篩分模式實(shí)現(xiàn)了單機(jī)循環(huán)粉碎，對于過大顆粒容易堵塞篩網(wǎng)難以透篩，物料容易形成環(huán)流層，篩網(wǎng)磨損嚴(yán)重等問題得到了有效的解決，本論文主要是對粉碎室內(nèi)部轉(zhuǎn)子組的重新設(shè)計(jì)以及對改變轉(zhuǎn)子組結(jié)構(gòu)前后分別進(jìn)行單向氣流以及氣固兩相流進(jìn)行模擬。 首先，本論文講述了課題研究的意義以及研究的背景，對有關(guān)于飼料粉碎機(jī)相關(guān)的理論做了詳盡的贅述，對常用的飼料粉碎機(jī)以及本課題研究的粉碎機(jī)如何工作進(jìn)行了分析，主要造成粉碎機(jī)分離效率低的幾個(gè)主要因素作了詳細(xì)的說明，在師兄師姐的研究基礎(chǔ)上進(jìn)行剖析，最后，確定自己研究的方向。 其次，粉碎機(jī)進(jìn)行了單相流以及雙相流進(jìn)行了模擬數(shù)值模擬[1]。比較單相流和雙向流對粉碎室的模擬結(jié)果，MRF是一種定常的求解方法，UDF是時(shí)間作為變量的動(dòng)網(wǎng)格計(jì)算方式，其中利用MRF計(jì)算的穩(wěn)定性，速度優(yōu)于利用UDF計(jì)算的結(jié)果，動(dòng)網(wǎng)格中UDF是一種自定義的函數(shù)，其計(jì)算的結(jié)果接近實(shí)際，但在運(yùn)算時(shí)間所上是MRF的9-10倍。 再次，改進(jìn)前后的錘片組互相對比分析。根據(jù)模擬結(jié)果可知改進(jìn)前后的錘片對物料的破碎力以及速度有所提高，加了肋板之后物料的速度明顯大于不加肋板的速度，提高了切向速度，即錘片與物料接觸的時(shí)候切向速度增加，有利于減小能耗，提高物料產(chǎn)量。環(huán)流層出現(xiàn)的本質(zhì)問題是原料無效撞擊過多，是部分原料圍繞著錘片端部的線速度作同向轉(zhuǎn)動(dòng)，加肋板之后環(huán)流層明顯減弱，，提高了物料和錘片之間的破碎力以及物料與物料之間的破碎力。 最后，加工出改進(jìn)之后的錘片組，對破碎機(jī)進(jìn)行了實(shí)驗(yàn)分析。分析物料運(yùn)動(dòng)情況，驗(yàn)證數(shù)學(xué)模型以及數(shù)值模擬的準(zhǔn)確性[2~8]。并以喂料量和轉(zhuǎn)速作為兩個(gè)因素，測量出不同喂料量以及不同轉(zhuǎn)速粉碎室內(nèi)物料的破碎合格率的情況，以一定時(shí)間出料量作為標(biāo)準(zhǔn)進(jìn)行比較，對比兩種情況的粉碎率。
[Abstract]:The hammer shredder has changed the traditional screening mode and realized the single machine cycle comminution. The problems such as too large particles easily clogging the screen screen are difficult to be sifted through, the material is easy to form circulation layer, and the sieve mesh wear is serious has been effectively solved.In this paper, the redesign of the rotor group in the comminution chamber and the simulation of the unidirectional flow and the gas-solid two-phase flow before and after the change of the rotor group structure are carried out.First of all, this paper describes the significance of the research and the background of the research, has done a detailed description of the relevant theory of feed crusher, and the commonly used feed crusher and how to work on the research of the grinder are analyzed.The main factors that cause the low separation efficiency of the pulverizer are explained in detail, and the direction of the research is determined on the basis of the research of the elder brother and elder sister.Secondly, the single phase flow and two phase flow are simulated by the pulverizer [1].Comparing the simulation results of single-phase flow and bidirectional flow on the comminution chamber. MRF is a steady solution method, in which the stability of MRF is better than that of UDF.UDF is a kind of self-defined function in moving grid. Its calculation results are close to reality, but the computation time is 9-10 times that of MRF.Thirdly, the hammers before and after the improvement were compared with each other.According to the simulation results, the crushing force and velocity of the improved hammers on the material are improved, and the velocity of the material is obviously higher than that of the non-ribbed plate after adding the ribbed plate, and the tangential velocity is increased.That is, the tangential velocity increases when the hammer is in contact with the material, which is beneficial to reduce the energy consumption and increase the material output.The essential problem of the circulation layer is that there is too much invalid impact of the material. Part of the material rotates in the same direction around the linear velocity of the end of the hammer, and the circulation layer obviously weakens after adding the ribbed plate.The crushing force between the material and the hammer and the crushing force between the material and the material are improved.Finally, the improved hammers were processed and the crusher was analyzed experimentally.Analyze material movement, verify the accuracy of mathematical model and numerical simulation [2 / 8].The crushing rate of different feed quantity and speed was measured by two factors, and the crushing rate was compared with the standard of material output in a certain time, and the comminution rate of the two kinds of cases was compared.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S817.122

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