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rock surface pneumatic dth blast hole machine KG420B

The KG420B down the hole drill rig for open use is an improved device in compliance with national regulations on diesel engine emissions. Equipped with the Yuchai four-cylinder engine (China III), the drill rig meets national standards for emissions and environment.

The folding frame track, four-wheel drive and tramming motor of plunger piston improve the working pressure and climbing capacity. The expanded pitch and lifting-arm hydraulic cylinder enable it to meet the requirements on extreme position.
The double-motor rotation increases the rotary torque and revolving speed; and the lifting hydraulic cylinder and chain are expanded to promote the lifting force and reliability.
The thickened profile folder is used for the housing, thus improving its level of intensity and rigidity; and the additional ring makes handling and lifting convenient.


Powerful Rotary Head, Cycloid rotation double motor for powerful rotation torque. Bigger and stronger designed rotation head for smooth high torque output and less drill tool jamming with seamless speed regulation.
Hydraulic System, The hydraulic system is upgraded,the hydraulic cylinder is more reliable, the system flow is increased, and the rotary drilling speed is increased.
Enlarged Dry Type Dust Collector, KG420BH, KG420TH is with Dust Collector. It is Hydraulic Cyclonic Laminar Flow. Reduce dust and protect workers health. Reduce air pollution and protect the atmospheric environment.
Control Panel, All controls integrated on the control panel for convenient operation by single operator, higher work efficiency and lower drilling cost, safer and more comfortable operation.
Walking Hydraulic Motor, Dual-speed tramming plunger hydraulic motor. Low noise, high efficiency, long service-life, high power, easy maintenance.
Construction Steel Crawler, Equipped with speed reduction tramming system and standard excavator track for compact structure. Excellent off-road performance with powerful two-speed hydraulic tramming system for extreme low failure rate.


Technical parameters
Model KG420B KG420BH
Transport dimension (mm) 5500x2250x2350 5600x2450x2350
Weight (kg) 4150 4350
Rock hardness f=6-20
Drilling diameter (mm) 90 to 130
Depth of economical drilling (m) 25
Roatory speed (rpm) 0 to 140
Rotary torque (Max) N.m 2000
Lifting force (KN) 25
Propulsion way Oil cylinder + flat chain
Feed stroke 3780mm
Travelling speed (km/h) 0 to 2.5
Climbing capacity ≤30 degree
Ground clearance (mm) 280
Tilt angle of beam Down 135 degree, up 50 degree, total 185 degree
Swing angle of boom Left 100 degree, Right 45 degree, total 145 degree
Pitch angle of drill boom down 50 degree, up 25 degree, total 75 degree
Swing angle of drill boom Left 44 degree, Right 45 degree, total 89 degree
Leveling angle of track ±10 degree
Compensation length of beam 900 mm
Supporting power Yuchai YC4DK80-T302
Rated power 58 KW
Rated revolving speed 2200 rpm
DTH hammer 3 inch, 4 inch
Drilling rod ф64*3 m, ф76*3 m
Air consumption 10 to 17 cubic meter/min
Maximum height of horizontal hole 2750 mm
Minimum height of horizontal hole 350 mm

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