Mining explosion-proof electrical equipment advanced cover opening grading poweroff control apparatus

Abstract

The invention discloses a mining explosion-proof apparatus that is applied to coal mine underground and especially discloses a mining explosion-proof electrical equipment advanced cover opening grading poweroff control apparatus. The apparatus comprises a shield and a lock pin that is arranged inside the shield; and the lock pin is connected with a key through a positioning pin. Besides, the apparatus is characterized in that: the end of the key is provided with a handle type starting special-purpose tool. By utilizing the above-mentioned technical scheme, the apparatus has the following beneficial effects that: starting and closing of a shield are direct factors for connection and disconnection of a power supply; if it is need to start a top cap of a wiring chamber of a power supply side or a load side of a switch, it is necessary to open the shield; and in order to open the shield, it is necessary to pull out a key, so that a lock pin is reset and power of the power supply side or the load side is automatically cut; therefore, it is ensured that the power of the power supply side or the load side can be cut off before the cap is opened; and thus, personal safety and coal mine safety can be ensured.

Description

technical field [0001] The invention relates to a flameproof and intrinsically safe high and low voltage power distribution switch, feed switch, starter, frequency converter, soft starter and low voltage lighting comprehensive protection device used in coal mines, especially a A mining explosion-proof electrical equipment cover-opening advance graded power-off control device. Background technique [0002] According to Article 445 of the "Coal Mine Safety Regulations": "Underground maintenance and relocation of electrical equipment, cables and wires are not allowed" and "Coal Mine Electromechanical Equipment Intact Standards" stipulates: "The flameproof joint surface fixed by bolts shall be fastened The degree should be qualified by flattening the spring pad without loosening." This device fundamentally solves this problem, that is, before opening the upper wiring compartment cover of the explosion-proof switch, if no special "key" is used to open it, any bolt cannot be remo...

AI Technical Summary

Problems solved by technology

And No. 200820077617 patent product, before opening the cover, put the end cover of the wiring compartment, except the bolts used by the two fixing devices, other bolts can be removed with ordinary tools, and the power supply side of the device is only used to send signals to the system before the cover is opened, and Instead of directly cutting off the power supply of the upper level, mines without a "system" cannot adopt this method, that is to say, they are bound by the "system"

In the past, the switches used in underground coal mines could not be sure whether the power supply was stopped after removing the switch cover on the load side or the power supply side. In order to prevent electric shock, a metal device was often used to discharge the wiring bolt and the switch shell. Generate sparks to cause combustion and explosion of mine coal dust or gas

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