Abstract:As the instantaneous flow of bulk materials is hard to be accurately measured at a high speed on a large capacity belt conveyor in real-time, a more positive and accurate method to measure the material instantaneous flow on belt conveyor based on laser scanning technology was proposed. When the 3D laser point cloud data of bulk materials surface profile are acquired at high speed by using 2D laser rangefinder and conveyor speed sensor, preprocessing steps of filtering, outliers excluding and data smoothing are applied. Then an automatic contour extraction method was proposed by analyzing the space morphological characteristics of material flow outlines laser point. By integrating the element area of material cross section, a mathematical model to calculate the instantaneous flow of bulk materials on belt conveyors was established. When measuring a trough belt conveyor whose belt speed is at 0.5 m/s to 2 m/s and bandwidth is 200 mm by using our laser scanning measurement system, the data repeatability and correlation can reach above 98%. Experiment results show that this method has strong applicability and reliability due to its small sample spacing, high measuring accuracy and real-time performance. The acquirement of real-time and accurate data can offer convenience for the further research of energy-saving control technology of belt conveyor in bulk terminal.

Abstract:In order to improve the current situation of dust concentration exceeding the limits in belt conveyer roadway,to explore the main influencing factors of dust concentration distribution, according to the similarity theory and the gas-solid two-phase flow equation motion, a similarity model device was designed for the specific situation in belt conveyer roadway. Fluent, which is a software of computational fluid dynamics, was used to analyze the dust concentration distribution in belt conveyor roadway of the similar model. Compared with similar experiment data analysis, the simulation result was consistent with the experimental data. The results show that the average wind speed in the roadway and the speed of the belt are the two main factors affecting the dust concentration distribution. When the average wind speed of the roadway is 0.15 m·s-1 ~ 0.60 m·s-1, the greater the wind speed, the lower the dust concentration. When the Tape speed is 1~ 2.5 m·s-1, the greater the speed, the higher the dust concentration.