Secondary negative pressure dust falling device of heading machine

The utility model relates to the technical field of heading machines, in particular to a secondary negative pressure dust falling device of a heading machine. According to the technical scheme, the dust falling device comprises a mounting base plate and a mounting base, a supporting rod piece is movably mounted at the bottom of the mounting base plate and movably connected with the mounting base plate through a telescopic hydraulic cylinder, a mounting barrel is fixedly mounted at the bottom of the supporting rod piece, a dust falling cavity is fixedly mounted on the mounting barrel, and a motor is fixedly mounted in the mounting barrel; and fan blades are installed at the output end of the motor, spraying rods are fixedly installed at the top and the bottom in the dust falling cavity correspondingly, and atomizing nozzles are evenly distributed on the spraying rods. According to the utility model, the dust falling angle of the dust falling mechanism can be movably adjusted through the telescopic hydraulic cy