煤矿井下采掘设备隔爆兼本安型电气控制箱的本安设计

针对煤矿井下采掘设备防爆兼本安型电气控制箱内本安电路与非本安电路并存、非本安电路的能量可能会窜入本安电路而影响本安电路防爆及本安性能的问题,从结构设计和电气隔离两方面介绍了煤矿井下采掘设备隔爆兼本安型电气控制箱的本安设计方法,给出了电气间隙、爬电距离、绝缘及耐压、接线端子、本安布线、电源变压器、本安隔离栅印制板等结构布置方法以及RS485通信隔离电路、模拟量隔离电路、压频变换电路、电阻信号隔离电路、开关量隔离电路、继电器隔离电路等电气隔离措施。应用表明,采用该方法设计的煤矿井下采掘设备隔爆兼本安型电气控制箱安全可靠,维护简便,能够满足煤矿井下的防爆要求。

Intrinsic Safety Design of Explosion-proof and Intrinsic Safety Type Electrical Control Box for Underground Mining Equipment

In order to solve problems that there are both intrinsic safety circuits and non-intrinsic safety circuits in explosion-proof and intrinsic safety type electrical control box for underground mining equipment and energy of the non-intrinsic safety circuits maybe transfer into the intrinsic safety circuits to damage explosion-proof and intrinsic safety performance,the paper introduced intrinsic safety design methods of explosion-proof and intrinsic safety type electrical control box for underground mining equipment in terms of structure design and electrical isolation,including structure arranging methods of electric interval,creepage distance,insulation,voltage resistance,terminal block,intrinsic safety wiring,transformer of power source and printed circuit board of intrinsic safety isolated barrier,and electrical isolation measures of isolation circuit for RS485 communication,isolation circuit for analog value,V/F converting circuit,isolation circuit for resistance signals,isolation circuit for switching value,isolation circuit for relay.The application showed that explosion-proof and intrinsic safety type electrical control box for mine-used control box by use of the methods is safe and reliable in performance and convenient in maintenance,which can meet explosion-proof requirement of coal mine underground.