The invention discloses mining downward drilling, water draining,
slag discharging and extraction integrated equipment which comprises an extraction
pipe, and the lower end of the extraction
pipe is open; a central
pipe is coaxially sleeved with the extraction pipe, a plurality of extraction holes are evenly formed in the bottom of the side wall of the extraction pipe, an extraction cavity is defined between the central pipe and the extraction pipe, an extraction connector and a deslagging connector are arranged at the top of the side wall of the extraction pipe, the extraction connector is connected with a gas extraction pipeline, and the deslagging connector is used for being connected with a deslagging pipe which is led into a roadway
drainage ditch; an extraction electromagnetic valveis arranged on the gas extraction pipeline, and a deslagging
electromagnetic valve is arranged on the deslagging pipe; and the upper end of the extraction pipe is closed, the upper end of the centralpipe is connected with a water injection pipe through a water injection
electromagnetic valve and connected with a gas injection pipe through a gas injection
electromagnetic valve. The invention further discloses a corresponding gas extraction method. The mining downward drilling, water draining,
slag discharging and extraction integrated equipment is suitable for downward gas extraction holes,
coal cinder and accumulated water accumulated in extraction holes can be conveniently discharged, a water seal effect is eliminated, water in the holes is reduced, the air permeability of
coal bodies around the extraction pipe is improved, and the gas extraction efficiency is improved.