Coal blockage alarm device for medium-speed coal mill

The invention belongs to the technical field of coal mill safety equipment, and discloses a medium-speed coal mill coal blockage alarm device which comprises a controller, an alarm lamp and a sensor, the back face of the controller is provided with a signal interface and an assembly cavity, and a middle hole is formed in the back face of the controller. Gas is pressed into the elastic air bag under cooperation of rotary extrusion, good sealing is maintained after the signal connector is sleeved with the elastic air bag by means of the expansion effect after ventilation of the interior of the elastic air bag, then air in the signal connector is pumped out when a movable plug in the suction assembly is pulled to move in cooperation with the operation assembly, and under negative pressure, the signal connector can be sucked out. The signal connector is fixed in a sleeved mode and then adsorbed and fixed in cooperation with the sealing frame, stability after actual wiring installation is greatly improved, good in