Underground-coal-mine ventilator working state monitoring device

The utility model discloses an underground-coal-mine ventilator working state monitoring device. The underground-coal-mine ventilator working state monitoring device comprises a left arch clamp, a right arch clamp, a reed switch, an L-shaped fixing plate and a magnet. The top end of the left arch clamp is hinged to the top end of the right arch clamp. The end of a short plate of the L-shaped fixing plate is fixed to the top of the right arch clamp. The reed switch is fixed to the inner side wall of a long plate of the L-shaped fixing plate. The magnet is fixed to the top of the left arch clamp. When the left arch clamp and the right arch clamp are folded to be in a circular ring shape, the reed switch is located right above the magnet. The underground-coal-mine ventilator working state monitoring device is ingenious in design, simple in structure and convenient to use, signal transmission is rapid and sensitive, the production requirement can be well met, and the problems that an existing mechanical button type monitoring sensor is quite prone to damage, short in service life and the like are further solved.