【摘要】 基于离散元仿真技术对输煤胶带端部的采样运动参数进行研究。通过改变端部采样切割斗在4×30个直径为50 mm颗粒料流模型中的运动速度,研究收集的颗粒粒子种类和数量。结果显示,随着切割斗运动速度从1 m/s升到2 m/s,收集的颗粒总数从2 006个降至958个,相当于胶带中部采样宽度从835 mm降至399 mm。将横截面为4×30个颗粒的料流水平分为30种颗粒的模型中,采样斗收集颗粒的标准差与切割速度无关,在切割速度1. 5 m/s时标准差最大,为3. 69,切割速度为1 m/s时标准差最小,为2. 43;将横截面为4×30个颗粒的料流垂直分为4种颗粒的模型,采样斗收集颗粒的标准差与切割速度呈弱线性相关,切割速度1 m/s时的标准差最大,为84. 98,切割速度1. 7m/s时的标准差最小,为53. 19。不同切割速度下,切割斗对远端和底层的采集效果较差,在设计中应向胶带方向加大采样斗进料口长度,提高对底层煤粒的收集效果。更多还原

【Abstract】 Based on the discrete element simulation technology,the sampling motion parameters at the end of coal conveying belt were studied.By changing the moving speed of the end sampling and cutting bucket in the material flow model of 50 mm diameter particles with cross section of 4×30,the kinds and quantities of particles collected were counted.The results show that with the increase of the moving speed of the cutting bucket from 1 m/s to 2 m/s,the total number of particles collected decreased from 2 006 to 958,which is equivalent to the sampling width of 835 mm to 399 mm in the middle of the belt.In the model of dividing 4×30 material flow into 30 kinds of particles horizontally,there is no correlation between the standard deviation of particles collected by sampling bucket and cutting speed.The standard deviation of particles collected by sampling bucket is the largest at cutting speed of 1.5 m/s,which is 3.69,and the smallest at cutting speed of1 m/s,which is 2.43.In the model of dividing 4×30 material flow vertically into 4 kinds of particles,the standard deviation of particles collected by sampling bucket is weakly linear with cutting speed.The maximum standard deviation is 84.98 at cutting speed of 1 m/s and 53.19 at cutting speed of 1.7 m/s.The results show that the effect of the primary sampler at the end of belt on the end of sampling direction and the bottom is not ideal at different cutting speed.In the design,the length of the inlet and outlet of sampling hopper should be increased in the direction of belt to improve the effect of collecting coal particles at the bottom.更多还原