本安型低功耗井下锚杆应力监测系统设计

Design of Intrinsic Safetyand Low Power Dissipation for Anchor Stress Monitoring Systemunder Coal Mine

针对井下有线应力监测系统存在的问题,基于低功耗和本质安全理论,设计一套终端采用电池供电的本安型低功耗井下锚杆应力监测系统,对井下锚杆等支护设备应力进行实时监测。系统按照分布式架构设计为3个层级:监测层、通讯层、监控层。系统搭建以STM32F103为核心的最小系统及外围控制电路,主要包括限压限流保护电路、A/D转换电路、ZigBee通信电路、唤醒电路、CAN通信电路等。电路依据GB3836.4 2010的本安规范设计,为验证系统长时间安全稳定运行的可靠性,按照MT/T772 1998性能测试方法搭建受试系统。通过测试,该本安型低功耗监测系统数据采集误差低于1%,低功耗节点电池使用时长可达1.5年,适用于井下支护设备的应力监测,具有较好的实用价值。

According to the existing problems of cable stess monitoring system under mine,based on the theory of low power consumption and intrinsic safety,this paper designed a battery powered intrinsically safe underground bolt stress monitoring system,which can monitor the stress of underground anchor and other supporting equipment in real time.According to the distributed architecture,the system was designed as three levels,monitoring layer,communication layer and monitoring layer.It built a minimum system with core of STM32F103 and peripheral control circuit that mainly include the voltage/current limited protection circuit,A/D conversion circuit,ZigBee communication circuit,wake up circuit,CAN communication circuit,etc.The design was based on the specification of GB3836.4-2010.To test and verify the reliability and stability of system,tested system was built according to the MT/T772-1998.The tests show that the intrinsically safe and low power dissipation system realize that data acquisition error is less than 1%.Meanwhile the battery in low power nodes can work continuously more than one year and a half.Therefore it is suitable for stress monitoring of the underground support equipment,and has a good value for practical application.