基于虚拟仪器的桥式起重机主梁应变采集系统设计

Design of bridge crane girder strain acquisition system based on virtual instrument

主梁是桥式起重机的重要组成部分及主要受力元件。为防止发生生产事故,需采集起重机主梁受力数据进行主梁寿命分析。设计了基于虚拟仪器的桥式起重机主梁应变采集系统。系统硬件主要包括传感器、连接器、数据采集卡、无线数据传输组、POE供电器和上位机。软件部分包括访问计算机中NI软硬件资源的接口软件NI MAX和进行主梁应变数据显示、存储的LabVIEW程序设计。通过该系统对50/10t桥式起重机主梁进行多位置、多工作日应变数据连续采集,得到主梁关键位置受力数据。运行结果表明,该主梁应变采集系统运行稳定,各通道任务信号准确,采集终端存储数据完整,满足测试任务要求,为后续主梁疲劳分析、准确预测该起重机主梁剩余使用寿命提供了重要数据支持。

Girder is an important part of the bridge crane, which is also the main force element. In order to prevent accidents, it is necessary to collect the bridge crane girder stress data to analyse the fatigue life. This paper constructs a bridge crane gird- er strain acquisition system. The hardware system consists of sensors, connectors, data acquisition cards, wireless data trans- mission groups, POE power and host computer. The software system consists of NI MAX to interface with the computer＇s NI hardware and software resources, and LabVIEW programming to display and storage the girder strain data. Through this system, positions and working days strain data acquisition for the 50/10 t bridge crane girder gets the key positions strain data. The results show that the girder strain data acquisition system runs stably, channel signals of acquisition task transmit accu- rately, and the terminal data stores competely, meeting the detection requirements, which provides an important data support for the subsequent fatigue analysis and accurate remaining service life prediction of the crane girder.