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BLAST HOLE DRILLING EQUIPMENT

  Roller-bit drilling rigs, Type SBSh became mostly used during opencast mining operations.
  Rigs of the SBSh Type manufactured at NKMZ are designed to drill both the vertical and inclined blast holes of 250 to 700 mm in dia and up to 32 m in depth in dry, water-saturated, monolithic and jointed rocks with the hardness of 6 to 20 according to prof. M.M.Protodyakonov's scale.
    Basic design feantures
  • Open P-shaped steel structure of the mast enables its easy servicing.
  • Squirrel cage variable frequency motor is installed on the rig swivel head.
  • Bore rods are made of tubes with 219 mm in dia. And 12 mm thread pitch.
  • Thyristor - operated smooth-start compressor is provided.
  • Planetary reduction gears and squirrel cage variable frequency motor are provided in the motion drive unit.
  • Winch-type feed drive is equipped with "Rexroth" MP-1800A hydraulic motor to provide continuous bore rod feed.
  • Hydraulic cylinders are provided to arrest the mast during inclined drilling.
  • Comfortable operator's cab is provided.
Blast hole drilling equipment
SPECIFICATIONS
Parameters Parameter values per Models
SBShS-250/270-32 SBShS-250N
Basic bore dia, mm 270 250
Drilling depth, m 32 32
Bore inclination angle with ref. to vertical, deg 0; 15; 30 0; 15; 30
Bore rod length, m 8 11
Capacity at rock strength f=16 to 18, m/hr 13.5 13.5
Feed force upper limit, kN 400 350
Drill bit rated torque, Nm 6000 6500
Rotational drive power, kW 90 90
Rotational speed upper limit, min-1 150 120
Lifting and lowering speed, m/min 13 12
Compressor plant capacity, m3/min 40 32
Max. travel speed, km/hr 0.7 0.92
Max. gradient to be ovecame, deg 12 12
Supply voltage, V 6000 380
Weight (without spares), t 90 78