Network power supply graded latch-selective power-off control system under coal mine well

Abstract

The invention relates to a network power supply graded latch-selective power-off control system under a coal mine well, which has the comprehensive functions of lighting under the coal mine well, loading signals and supplying power, controlling power supply as well as protecting short circuit and leakage of electricity. The system is provided with two connecting line cavities, a power supply connecting line cavity and a load connecting line cavity; wherein, the two connecting line cavities are in independent flame proof type; by the control of open top locking devices of the connecting line cavities, a switch at the level does the tripping operation when a cover of the load connecting line cavity is opened, and load wire connecting terminals are uncharged; only when the cover of the load connecting line cavity is closed, the switch at the level is electrified; when a cover of the power supply connecting line cavity contrary to the instructions, a switch at the upstream does the tripping operation, the power supply is cut off, and terminals in the connecting line cavities are uncharged. An electric circuit of the system mainly consists of a main circuit, a control and protection circuit, a lighting short-circuit protection circuit, a signal short-circuit protection circuit and an earth-leakage protection circuit. The system has simple and reliable structure as well as low cost, and improves the fireproofing and explosion prevention properties of a single machine and a whole power supply system.

Description

technical field [0001] The invention relates to a comprehensive protection device for mine explosion-proof low-voltage electrical appliances, in particular to a coal mine underground network power supply hierarchical locking selective power-off control system. Background technique [0002] The mining lighting and signal comprehensive protection device used in coal mines can be used in environments containing explosive gas and dust, and can provide comprehensive functions such as power supply, control and protection for small electrical appliances such as lighting lamps, signals, and discharge lamps. [0003] For example, the Chinese patent application number is 90105986.2, which discloses a comprehensive protection device for long-distance lighting signals in coal mines. It consists of two independent chambers, a wiring chamber and a main chamber, and is suitable for environments containing explosive gases and dust; Chinese patent application number A comprehensive protectio...

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Problems solved by technology

However, none of the above-mentioned existing technologies can avoid gas explosion accidents caused by electric sparks caused by illegal opening of the cover. The prior art does not involve the related technology of mining lighting signal comprehensive protection device to avoid illegal opening of the cover, and the existing mine lighting signal All comprehensive protection devices have the problems of complex structure and high cost

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