本文選題：瀝青攪拌器 + 攪拌工藝�。� 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：伴隨著我國(guó)公路交通事業(yè)的迅猛發(fā)展,人們對(duì)瀝青路面的質(zhì)量和使用壽命要求也越來(lái)越高。瀝青混合料攪拌設(shè)備作為路面機(jī)械化施工的關(guān)鍵設(shè)備,其性能和水平直接決定著混合料的生產(chǎn)質(zhì)量和效率。目前國(guó)內(nèi)外對(duì)瀝青混合料攪拌工藝方面的研究較少,這使得大多數(shù)用戶在生產(chǎn)時(shí)仍是根據(jù)以往經(jīng)驗(yàn)來(lái)調(diào)整攪拌工藝參數(shù)的,沒(méi)有嚴(yán)格的理論依據(jù)和試驗(yàn)數(shù)據(jù),缺乏科學(xué)性,常會(huì)造成所制備瀝青成品料質(zhì)量無(wú)法滿足使用要求,從而引發(fā)瀝青路面的早期破壞,降低其使用壽命。本文在明確攪拌目的和機(jī)理的基礎(chǔ)上,針對(duì)瀝青混合料攪拌過(guò)程的特殊性,分析了投料位置、投料順序、投料持續(xù)時(shí)間、充盈率以及攪拌時(shí)間等工藝參數(shù)對(duì)攪拌均勻性、攪拌效率和攪拌能耗的影響。結(jié)合理論分析,運(yùn)用EDEM離散元軟件仿真模擬了不同參數(shù)對(duì)混合料攪拌效果的影響,為了驗(yàn)證分析的正確性,設(shè)計(jì)了相關(guān)試驗(yàn)方案,并在此基礎(chǔ)上進(jìn)行了工地現(xiàn)場(chǎng)試驗(yàn)和實(shí)驗(yàn)室試驗(yàn)。試驗(yàn)結(jié)果表明:(1)投料位置對(duì)攪拌均勻性的影響程度是最顯著的,它主要影響著材料的初始分布均勻性,進(jìn)而對(duì)攪拌質(zhì)量和攪拌效率產(chǎn)生影響。橫向中央布置的投料位置形式優(yōu)于橫向單側(cè)布置和軸向端部布置。(2)投料持續(xù)時(shí)間主要影響著材料進(jìn)入拌鍋的速率,它也是影響混合料攪拌質(zhì)量和效率的一項(xiàng)重要工藝參數(shù)。隨著粉料投料持續(xù)時(shí)間的延長(zhǎng),混合料的攪拌均勻性有所改善,這得益于粉料投入攪拌器的速率較慢,可以實(shí)現(xiàn)充分分散,降低了與瀝青膠結(jié)成團(tuán)的概率,從而提高了混合料的攪拌質(zhì)量。(3)充盈率除影響攪拌器的攪拌質(zhì)量和生產(chǎn)能力外,還對(duì)攪拌能耗有著顯著影響。在相同攪拌時(shí)間條件下,增大充盈率,可以提高攪拌器的生產(chǎn)率,但是攪拌功率和攪拌不均勻性也隨之增加。當(dāng)充盈率超過(guò)60%繼續(xù)增大時(shí),這種影響就更為顯著,此時(shí)需要適當(dāng)延長(zhǎng)攪拌時(shí)間才能保證混合料的攪拌質(zhì)量,而這實(shí)際降低了攪拌器的生產(chǎn)率。
[Abstract]:With the rapid development of highway transportation in China, the quality and service life of asphalt pavement are required more and more. Asphalt mixture mixing equipment is the key equipment of road mechanization construction. Its performance and level directly determine the production quality and efficiency of the mixture. At present, there is little research on asphalt mixture mixing process at home and abroad, which makes most users adjust the mixing process parameters according to previous experience, without strict theoretical basis and test data, lack of scientific. The quality of asphalt finished material can not meet the requirement of use, which can lead to the early destruction of asphalt pavement and reduce its service life. According to the particularity of the mixing process of asphalt mixture, this paper analyzes the mixing uniformity of the process parameters such as the feeding position, feeding sequence, feeding duration, filling rate and mixing time on the basis of clear mixing purpose and mechanism. The effect of stirring efficiency and energy consumption. Combined with theoretical analysis, the influence of different parameters on mixing effect of mixture is simulated by using EDEM discrete element software. In order to verify the correctness of the analysis, the related test scheme is designed. On this basis, site tests and laboratory tests were carried out. The results show that the influence of feeding position on the mixing uniformity is the most significant, which mainly affects the initial distribution uniformity of the material, and then affects the mixing quality and the agitation efficiency. The feeding position of lateral central arrangement is superior to that of lateral unilateral arrangement and axial end arrangement. The feeding duration mainly affects the rate of material entering into the mixing pot, and it is also an important technological parameter affecting the mixing quality and efficiency of mixture. With the prolongation of the powder feeding time, the mixing uniformity of the mixture is improved, which is due to the fact that the powder is put into the agitator at a slower rate, which can achieve full dispersion and reduce the probability of agglomeration with asphalt. Thus, the mixing quality of the mixture is improved. The filling ratio not only affects the agitator's mixing quality and production capacity, but also has a significant effect on the mixing energy consumption. Under the same stirring time, the productivity of agitator can be improved by increasing the filling ratio, but the mixing power and inhomogeneity also increase. When the filling ratio is more than 60%, the effect is more obvious. In this case, the mixing quality can be guaranteed by prolonging the mixing time properly, which actually reduces the agitator productivity.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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本文編號(hào)：1925818