The invention relates to a single body large-
diameter pneumatic down-the-hole hammer. The single body large-
diameter pneumatic down-the-hole hammer comprises a
drill, a spline shaft, a spline sleeve, a cylinder body, a gas distribution sleeve, a bush, an upper
flange, an intermediate
flange, a
piston and a central gas
pipe which are coaxially connected with one another, wherein the central gas
pipe is arranged in an inner hole of the
piston and is a double-core
pipe; a gas-guide annular groove is formed between an
outer core pipe and an inner core pipe of the double-core pipe; an ejecting hole communicated with the inner core pipe is formed on the spline shaft connected with the
drill; an exhaust
check valve is arranged at an inlet of the ejecting hole; the intermediate
flange is providedwith an exhaust channel and an intake channel; and an exhaust
throttle valve is arranged in the exhaust channel. The single body large-
diameter pneumatic down-the-hole hammer of the invention can achieve good gas lifting reverse circulation
slag-absorbing and
slag-discharging effects, effectively preventing the abrasion of parts caused by internal movement due to
slurry recharge, is compact and reasonable in structure, light in weight and low in manufacturing cost, is convenient to assemble and maintain, and has high working efficiency.