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 |
