KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment

KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment
KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment
KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment
KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment
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The KJ421 hydraulic tunneling drilling rig is qualified for the drilling of tunnels whose section falls in the range of 16-68 square meters. It is capable of drilling blast holes and rock bolting in a vertical, inclined and horizontal orientations.

Features
  • The drill rig is fitted with a flexible boom in two symmetric rectangular coordinates, without any operation blind spots. 360° rotation and self-leveling beam make drill positioning extremely easy. It can also be used for the drilling of lateral cross-cut and rock bolting.
  • The drilling rig provides a good view for the operator; balanced layout and the articulated chassis of four-wheel drive ensure the flexible, fast and safe driving in the narrow tunnel.
  • The stepped piston is used for the high-frequency impacting rock drill and this can improve the transmission efficiency of impact and drilling speed and reduce the consumption of drilling tools.
  • Considerable space and automatic functions enable the driver to concentrate on drilling in a safe, fast and accurate manner;
  • All the relevant parts are protected and maintenance is easy.
  • Dimension
  • Turning Radius
  • Coverage area
Technical Parameters
1. Dimensions and weight
Length 13000mm
Width 2200mm
Height 2400/3100mm
Weight About 22000kg
Tramming speed on flat ground 10km/h
Maximum climbing capacity 25%(14°)
2. Air& water system
Air compressor 1×JN11 Oil consumption of lubrication 2×180-250 g/h
Capacity of air compressor 1.55m³/min
Pressure 8 bar Water pump 1×CR15
Device of shank lubrication Electronic pulse lubrication pump Power 11kW
Air consumption of lubrication 2×0.3m³/min Capacity of water pump 12m³/h
3. Chassis
Diesel engine Cummins QSB3.9-C125
/93kW/2200rpm
Travelling braking Wet bridge brake
Exhaust purification Exhaust catalyst Parking braking Mechanical brake
Drive system Hydraulic torque converter gearbox Fuel tank 120L
4. Safety protection
Noise level <100dB(A)
Lifting safety roof Meet the requirements of FOPS and ROPS
5. Drilling system
Rock drill 2×HC95LM
Impact power 21kW
Impact flow 100-120L/min
Impact pressure 180-200bar
Impact Frequency 54-62Hz
Torque 764Nm
Beam rotation 360°
Feed extension 1600mm
Model of drill boom K40
Form of drill boom Self-leveling
Boom extension 1800mm
6. Electric hydraulic power unit
Motor 2×75kW Three-phase motor
Impact/Feed/Positioning Axial variable displacement piston pump
Rotation Gear pump
Filter fineness 10 μ
Hydraulic oil tank 400L
Hydraulic cooler Water cooler
Working voltage 380V
Frequency 50Hz
Starting method Star-triangle
Cable reel 1×CRC1016
length of reel cabling 100m
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