The invention provides a fully hydraulic reverse circulation drilling
machine, which comprises a walking mechanism, a
chassis assembly, a work table frame
assembly, a main frame, a main frame turning oil cylinder, a swinging rod
assembly, a
winch assembly, a
drill pipe, a dismounting device, a hydraulic
system, a power take-off assembly, an
impact drill bit, a rotating wing
drill bit, a power assembly and an oil cylinder
pulley assembly. A
diesel engine or
electric power is used for driving; hydraulic motors and oil cylinders are used as executing mechanisms; and the whole
process operation of the drilling
machine is realized through a hydraulic transmission and
control system. The two hydraulic motors and a gear
reducer are used for forming a power head to drive a drilling tool to rotate; the hydraulic motors adopt a serial connection or parallel connection mode; and the
drill pipe realizes different rotating speeds and can adapt to different-geological-condition and different-hole-
diameter operations. The oil cylinders are used for controlling the oil
pipe feeding and lifting the drilling tool, so that the power head can vertically move along with the drilling tool and can realize floating, suspension stop and pressurized drilling; the
drill pipe can be automatically dismounted and mounted; and the
impact drill bit and the rotating wing
drill bit are used for realizing the hole drilling of holes with the hole
diameter being 2 to 3m and the hole depth exceeding 200m in the
pebble bed, the hard rock stratum and the stratum containing large-
diameter rock blocks.