KJ421 Hydraulic Underground Drilling Rig, Tunnel Drilling Equipment

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