一种矿井巷道断面瞬时监测系统设计

Design of an instantaneous monitoring system of mine roadway section

针对矿井巷道断面人工测量方式费时费力、误差大以及现有巷道断面测量仪检测速度慢、无法实现上位机实时监测等问题,提出了一种基于PLC和ZigBee网络的矿井巷道断面瞬时监测系统的设计方案。该系统中,PLC输出2个6 400个/s的高速脉冲序列,分别用于控制步进电动机旋转和驱动脉冲式激光测距仪测距;HC0,HC1高速计数器分别对2个脉冲序列计数;步进电动机步进角设置为0.45°;激光测距仪旋转1周后,PLC计算出巷道断面的周长和面积,并将计算结果通过ZigBee网络发送至上位机进行实时显示。实验结果表明,该系统每隔10s更新显示巷道断面的周长和面积,周长测量的相对误差不超过0.5%,面积测量的相对误差不超过0.9%。

Manual measuring method for mine roadway section is time-consuming and laborious with big error, and existing measuring instruments of roadway section are poor in measuring speed and cannot realize real-time monitoring by upper computer. A design scheme of instantaneous monitoring system of mine roadway section was proposed based on PLC and ZigBee network. PLC of the system outputs two high speed pulse sequences at 6 400 bit/s to control stepper motor to rotate and drive pulsed laser rangefinder to range respectively. High-speed counters of HC0, HC1 count two pulse sequences respectively. Step angle of the stepper motor is 0.45°. After laser rangefinder rotates 360°, the PLC calculates perimeter and area of roadway section and sends the results to upper computer through ZigBee network for real-time display. The experimental results show that the system updates to display perimeter and area of roadway section every 10 seconds. Relative error of perimeter measuring is no more than 0. 5%, and the one of area measuring is no more than 0. 9%.