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综合水平与垂直2种气流场的风选特征,建立任意倾斜角度流场风选模型,推导出风选气流参数(气流速度与方向)与固体物料沉降轨迹之间的关系。研究结果表明,风向一定时,随着风速增大,密度不同的物料水平风选位移差增大,风选精度增高;风速一定时,随着风向倾斜角度增大,风选精度先增大后减小,最佳倾斜角集中在45°～60°之间。通过计算与试验分析,得到建筑废弃物再生骨料精确分离的最佳风选参数:8mm粒度级骨料采用风向60°、风速16m/s;15mm粒度级采用风向45°、风速24m/s;24mm粒度级风向60°、风速28m/s。该研究结果为研制建筑废弃物风力精选设备提供了参考依据。
Based on the wind characteristics of two horizontal and vertical airflow fields, a wind selection model of arbitrary inclination angle flow field is established, and the relationship between the parameters of airflow (airflow velocity and direction) and the settlement trajectory of solid material is deduced. The results show that when the wind direction is constant, as the wind speed increases, the air-bearing displacement difference of materials with different density increases, and the precision of wind selection increases. When the wind speed is fixed, the wind selection accuracy first increases with the increase of wind direction tilt angle Decrease, the best tilt angle is concentrated between 45 ° ~ 60 °. Through the calculation and experimental analysis, the best parameters for the precise separation of recycled aggregate waste from construction waste were obtained: the wind direction was 60 ° and the wind speed was 16m / s for the 8mm particle size aggregate; the wind direction was 45 ° and the wind speed was 24m / s for the 15mm particle size class; 24mm particle size grade wind direction 60 °, wind speed 28m / s. The results provide a reference for the development of wind power equipment for construction waste selection.