Flammable and explosive place lighting explosion-proof power supply and method for coal mine roadway

Abstract

The invention relates to a flammable and explosive place lighting explosion-proof power supply and method for a coal mine roadway and belongs to the technical field of explosion prevention of coal mine roadway lighting equipment. According to the power supply, a current detection sensor detects the current condition of a lighting load circuit; and the whole process of overload to cause short circuit is determined according to the overload circuit strength and duration, and the high-speed turn-off circuit is controlled to quickly turn off the power supply of the explosion-proof power supply toan external power supply transmission line and electric equipment. According to the current detection sensor, detection of the current of the lighting load circuit is completed in the metal explosion-proof shell, the lighting power supply is cut off through the high-power MOS switch tube in the metal explosion-proof shell, the whole process is completely carried out in the metal explosion-proof shell, and no electric spark is generated in a coal mine roadway. Meanwhile, overload and short circuit conditions are accurately analyzed and judged, overload and short circuit are distinguished and processed in time, and it is guaranteed that coal production is safely and orderly conducted.

Description

technical field [0001] The invention relates to an explosion-proof power supply and method for lighting inflammable and explosive places used in coal mine roadways, especially for the high-speed electrical shutdown of large current group lighting equipment, and to study the accident The method and special equipment for preventing major explosion accidents that may be caused by short circuit, and discusses the research and application of large-capacity intrinsically safe power supply, belongs to the field of explosion-proof technology for coal mine roadway lighting equipment. Background technique [0002] At present, the mine lighting explosion-proof switch is only explosion-proof for the switch shell, and the lighting equipment and lighting lines outside the shell do not have real explosion-proof function. lead to major catastrophic accidents. The domestic coal mine roadway lighting power supply and switch are mostly explosion-proof lighting comprehensive protection devices...

AI Technical Summary

Problems solved by technology

For the protection of lighting equipment and lighting lines outside the shell, the relay contacts are disconnected to cut off the circuit overload, large current or short-circuit current. Due to the existence of inductance coils during the operation of the relay, the operation time of the relay is longer (0.13-0.36s), unable to block the generation of instantaneous electric spark in short circuit in time

However, if the lighting equipment and lighting lines outside the metal explosion-proof shell are accidentally short-circuited or broken by metal objects such as coal mining equipment and working face support, and the short-circuit causes an instantaneous high current, electric sparks are easily generated, which may lead to major catastrophes. ACCIDENT

Therefore, a large number of explosion-proof lighting comprehensive protection devices for coal mine roadways in the prior art do not have a real integral explosion-proof function.

In addition, the lighting load in the coal mine roadway is complicated. Sometimes there is only a short-term overload, and there is no risk of short circuit. Sometimes the overload fluctuates greatly, and sometimes the overload may cause a short circuit. However, the existing technology cannot accurately distinguish, which can easily cause misoperation and untimely operation, which will adversely affect coal production

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