Abstract

The discharging homogeneity and discharge efficiency of fresh concrete are the most important aspects of engineering practices of researchers. In this study, the influence of the main structural parameters of the blade on the discharge homogeneity and efficiency is numerically simulated through an orthogonal test based on the discrete element method. The order of influence of the blade structural parameters on the discharging homogeneity was obtained through range analysis and determined: t-shaped blade width > blade width > blade pitch > blade swing angle. Regarding the discharge efficiency, the influence order is blade pitch > blade swing angle > t-shaped blade width > blade width. Considering the discharging homogeneity and discharge efficiency, the optimal width of the t-shaped blade, blade pitch, blade width, and blade swing angle of the front cone–central cylinder–back cone were established as 120 mm, 1800–2280–1680(mm), 480–440–390 (mm), and 90°–90°–75°, respectively.

摘要

新拌混凝土的排放均匀性和排放效率是研究人员工程实践中最重要的方面。本研究通过基于离散元法的正交试验数值模拟了叶片主要结构参数对放电均匀性和效率的影响。通过极差分析得到叶片结构参数对出料均匀性的影响顺序，确定为：T型叶片宽度>叶片宽度>叶片节距>叶片摆角。关于排放效率，影响顺序为桨距>桨叶摆角>T形桨叶宽度>桨叶宽度。考虑出料均匀性和出料效率，优化T型叶片宽度、叶片间距、叶片宽度、 毫米、1800–2280–1680（毫米）、480–440–390（毫米）和 90°–90°–75°，分别。