【摘要】：對(duì)我國(guó)高等級(jí)公路來(lái)說(shuō),路面的質(zhì)量和壽命一直受到"離析"問(wèn)題的影響。隨著道路建設(shè)事業(yè)的迅速發(fā)展,對(duì)攤鋪機(jī)的科技含量要求也越來(lái)越高,大型寬幅攤鋪機(jī)的研發(fā)受到國(guó)內(nèi)外攤鋪機(jī)行業(yè)的高度重視。但由于我國(guó)技術(shù)基礎(chǔ)相對(duì)比較薄弱,目前仍然是進(jìn)口大型寬幅攤鋪機(jī)占領(lǐng)著國(guó)內(nèi)市場(chǎng)。而螺旋分料器作為攤鋪機(jī)的主要工作裝置,對(duì)分料質(zhì)量起著重要的作用。本文針對(duì)大型寬幅攤鋪機(jī)在要求寬度上下料的不均勻性及混合的不均勻性,對(duì)螺旋分料器中混合粒料進(jìn)行了受力和運(yùn)動(dòng)分析,建立了螺旋分料器的仿真模型,探討了螺旋分料器的結(jié)構(gòu)和工作參數(shù)對(duì)混合粒料運(yùn)動(dòng)的影響,同時(shí),建立了變徑變螺距模型,提出了相應(yīng)的優(yōu)化改進(jìn)方案。論文的主要研究?jī)?nèi)容包括以下幾部分:(1)研究螺旋分料器的結(jié)構(gòu)與工作原理,對(duì)在螺旋分料器作用下的粒料進(jìn)行受力和運(yùn)動(dòng)分析,探討螺旋分料器的主要結(jié)構(gòu)和工作參數(shù)對(duì)混合粒料運(yùn)動(dòng)的影響,找出粒料離析的原因。同時(shí)建立攤鋪速度、刮料板速度及螺旋轉(zhuǎn)速模型,實(shí)現(xiàn)三者速度的有效匹配。(2)建立螺旋分料器的有限元仿真模型,對(duì)瀝青混合料在螺旋分料器中的粒料運(yùn)動(dòng)進(jìn)行流場(chǎng)仿真,探討螺旋分料器的結(jié)構(gòu)和工作參數(shù)對(duì)于螺旋分料器徑向下料量均勻性的影響以及混合效果的影響。(3)分析由于吊桿的存在所導(dǎo)致的螺旋非連續(xù)性對(duì)分料效果的影響,并對(duì)其進(jìn)行優(yōu)化設(shè)計(jì)。(4)采用變徑變螺距數(shù)學(xué)模型對(duì)螺旋分料機(jī)構(gòu)進(jìn)行參數(shù)優(yōu)化,從理論上驗(yàn)證變徑變螺距技術(shù)的可行性,并利用有限元分析進(jìn)行優(yōu)化結(jié)果的驗(yàn)證,確定最佳的變徑變螺距螺旋分料器結(jié)構(gòu)。
[Abstract]:For the high-grade highway in China, the pavement quality and service life have been affected by the "segregation" problem. With the rapid development of road construction, the scientific and technological requirements of paver are becoming more and more high, and the research and development of large and wide paver is highly valued by the paver industry at home and abroad. However, because of the relatively weak technical foundation in our country, the import of large wide spread pavers still occupies the domestic market. As the main working device of paver, the screw separator plays an important role in the quality of material separation. In this paper, aiming at the inhomogeneity of the material on the required width and the non-uniformity of the mixing in the large wide spread paver, the force and motion of the mixed grain in the screw separator are analyzed, and the simulation model of the screw separator is established. The influence of the structure and working parameters of the screw separator on the movement of mixed particles is discussed. At the same time, the variable diameter variable pitch model is established, and the corresponding optimization improvement scheme is put forward. The main contents of this paper are as follows: (1) the structure and working principle of the screw separator are studied, and the force and motion of the particles under the action of the screw separator are analyzed. The influence of the main structure and working parameters of the screw separator on the movement of mixed granular material is discussed, and the reasons for the segregation of the granular material are found out. At the same time, the spreading speed, scraping plate speed and spiral speed model are established to realize the effective matching of the three speeds. (2) the finite element simulation model of the screw separator is established, and the flow field simulation of the asphalt mixture particle movement in the screw separator is carried out. The influence of the structure and working parameters of the screw separator on the uniformity of the radial load and the effect of the mixing effect are discussed. (3) the influence of the helical discontinuity caused by the existence of the suspender on the separation effect is analyzed. And the optimization design is carried out. (4) the variable diameter variable pitch mathematical model is used to optimize the parameters of the screw separation mechanism, and the feasibility of the variable diameter variable pitch technology is verified theoretically, and the optimization results are verified by finite element analysis. Determine the optimal structure of the variable diameter and pitch screw splitter.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U415.521

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本文編號(hào)：2228858