带式输送机物料瞬时流量激光测量方法

针对高带速、大运量带式输送机物料瞬时流量难以实时精准测量问题,提出一种基于激光扫描的带式输送机物料瞬时流量高精度实时测量方法.利用二维激光测距仪和测速传感器获取带式输送机高速运行下物料流三维激光点云数据,经滤波、异常值剔除、数据平滑等预处理后,通过分析扫描线上激光点云空间形态特征提出一种物料流轮廓自动提取方法,并建立基于面元积分的带式输送机物料瞬时流量计算数学模型.开发的带式输送机物料瞬时流量测量系统用于测量带宽为200mm槽型带式输送机在带速0.5~1.5m/s下物料流瞬时流量时,数据重复性和相关性都达到98%以上.实验结果表明,该方法采样间距小、测量精度高、实时性强,具有较强适用性和可靠性,有助于为港口带式输送机自适应节能控制技术提供实时、精确的数据来源.

Measurement of Material Instantaneous Flow on Belt Conveyors Based on Laser Scanning

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 outline's 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.