铁路货运车辆轮重仪测控系统设计

Design of measurement and control system for wheel weight instrument of railway freight vehicle

针对铁路运输监管部门对货运车辆超重、偏载和偏重检测的需求,根据轮重仪的机械结构和工作原理设计了测控系统。该测控系统通过控制液压泵电机产生高压油驱动活塞举升车轮,并采用模数转换器检测液压回路压力,软件将压力换算为轮重,一节货车测试完成后能够自动计算总重、货重、偏载和偏重。结果表明,该测控系统运行稳定,测量精度高,并具有低电压保护、超重保护、温度校正功能,能实现轮重检测、数据处理和记录过程自动化。

In order to meet the requirement of railway transportation department for the detection of freight vehicle overweight,partial load and partial weight,measurement and control system was designed in accordance with the mechanical structure and working principle of wheel weight instrument.The measurement and control system controlled the hydraulic pump motor to generate high-pressure oil so as to drive piston lifting wheel.The analog-to-digital converter was applied to measure the pressure of hydraulic loop,and converted the pressure value to wheel weight.After a freight vehicle was tested,its total weight,cargo weight,partial load and partial weight could be calculated automatically.The results show that the system is stable in operation and precise in measurement,coupled with the advantages of low voltage protection,overweight protection and temperature correction,capable of realizing the automation of wheel weight detection,data processing and data recording.