Flame-proof casing uncovering power-off device

The utility model relates to a flame-proof casing uncovering power-off device, belonging to a coal mine article. The power-off device comprises a casing cover and a circuit in the casing; the casing cover is provided with an uncovering screw aperture. The characteristics are that the circuit is in series connection with a reed pipe trigger switch; the casing cover is provided with a stepped shaft; the lower end of the stepped shaft is in connection with a magnet corresponding with the position of the reed pipe trigger switch; the casing cover is also provided with a pin which dials the stepped shaft to drive the magnet to be far away from the reed pipe trigger switch when the uncovering screw aperture is rotated. The beneficial effects of the flame-proof casing uncovering power-off device are that when a flame-proof product needs to be uncovered for maintenance, a pre-stage power supply can be cut off by opening a door cover so as to avoid accident.