大型宽幅摊铺机螺旋分料器仿真与系统参数优化

发布时间：2018-09-07 16:56

【摘要】：对我国高等级公路来说,路面的质量和寿命一直受到"离析"问题的影响。随着道路建设事业的迅速发展,对摊铺机的科技含量要求也越来越高,大型宽幅摊铺机的研发受到国内外摊铺机行业的高度重视。但由于我国技术基础相对比较薄弱,目前仍然是进口大型宽幅摊铺机占领着国内市场。而螺旋分料器作为摊铺机的主要工作装置,对分料质量起着重要的作用。本文针对大型宽幅摊铺机在要求宽度上下料的不均匀性及混合的不均匀性,对螺旋分料器中混合粒料进行了受力和运动分析,建立了螺旋分料器的仿真模型,探讨了螺旋分料器的结构和工作参数对混合粒料运动的影响,同时,建立了变径变螺距模型,提出了相应的优化改进方案。论文的主要研究内容包括以下几部分:(1)研究螺旋分料器的结构与工作原理,对在螺旋分料器作用下的粒料进行受力和运动分析,探讨螺旋分料器的主要结构和工作参数对混合粒料运动的影响,找出粒料离析的原因。同时建立摊铺速度、刮料板速度及螺旋转速模型,实现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,对沥青混合料在螺旋分料器中的粒料运动进行流场仿真,探讨螺旋分料器的结构和工作参数对于螺旋分料器径向下料量均匀性的影响以及混合效果的影响。(3)分析由于吊杆的存在所导致的螺旋非连续性对分料效果的影响,并对其进行优化设计。(4)采用变径变螺距数学模型对螺旋分料机构进行参数优化,从理论上验证变径变螺距技术的可行性,并利用有限元分析进行优化结果的验证,确定最佳的变径变螺距螺旋分料器结构。
[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.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U415.521

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