Down-the-Hole Drilling Machines

Goodeng GMD70S drilling and mineral drilling exploration borewell equipment boring mine rig

Introducing the powerful and efficient Cummins Engine QSZ13-C475 with a robust power of 354 kW, manufactured by Shanghai Goodeng International Co., Ltd. This innovative product is equipped with a two-stage air compressor, boasting a capacity of 26m³/min and 25bar. The automatic rod changing system ensures seamless operation, while the dry dust collector with automatic filter cleaning enhances maintenance efficiency. The high strength aluminum traveling motor and dual-speed hydraulic traveling motor enable reliable and smooth movement. Additionally, it features an electric fuel refueling pump and an air-conditioned cab for operator comfort. With a focus on performance and convenience, this product is a testament to Shanghai Goodeng International Co., Ltd.'s commitment to delivering high-quality equipment for diverse industrial applications

Technical Parameter

Hole diameter	φ90-203mm	3.5-8 in
DTH hammer	4 in/5 in/6 in/7 in
Rod changing system	Drill rod storage	5+1
	Drill rod diameter	114 mm	4.5 in
	Drill rod length	6 m	19.7 ft
	Max. Hole depth	36 m	118.1 ft
Hydraulic rotation head	Rotation speed	0-80 rpm
	Drilling torque	3900N·m	2876 ft·lbs
	Max. Rotation torque	6000N·m	4425 ft·lbs
Engine	Rated power	354 KW/1800 rpm	474.6 hp
Engine	Fuel tank	850 L	224.5 gal
Two-stage air compressor	Max. Working pressure	25 bar	362.6 psi
Two-stage air compressor	Max. displacement	26m³/ min	918.6 ft ³/min
Drill boom type	High strength single straight boom
High strength steel feed beam Chain motor type	Total length	9470 mm	311.4 ft
	Travel length	6500 mm	21.3 ft
	Feed extension	1600 mm	5.3 ft
	Max. Feed rate	0.9 m/s	2.95 ft/s
	Max. Feed force	40 kN	8992 lbs
	Max Tractive pull	50 kN	11240 lbf
Adjustable flat chssis	Traveling speed	1.5/3 km/h	0.93/1.86 mph
	Max. Traction force	165 k N	37085 lbs
	Gradient	25°
	Track oscillation	±10°
	Ground clearance	420 mm	16.54 in
Transportation Condition	Weight	21000 kg	46297 lbs
Transportation Condition	Size(LWH)	1270025003600mm	41.7 ft* 8.2 ft*11.8ft

Product Introduction

The GMD70S is a diesel powered down-the-hole (DTH) drill rig designed for 90-203 mm drilling operations in pre-splitting and conventional production blasthole drilling. The rig has enhanced mobility, a smaller footprint and can serve multiple sites.

1. Precise control system
This drilling rig has a precise control system and simple icon display, which enables seamless collaboration between man and machine.
2. Smart air compressor management system
This drill generates 18 cubic meters of compressor airflow at 25 bar pressure and uses a 354 kW diesel engine, which is a perfect match for a 4-inch down-the-hole hammer. By making full use of the equipment's energy, you can reduce your operating costs and energy consumption.

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solution MAIN DETAILS

application

APPLICATION AREA

Production Process

BLANKING

RIVET-WELDING

MACHINING

ASSEMBLING

DEBUGGING

TESTING

FAQ

1

What is a Down-the-Hole (DTH) drill?

DTH hammer is a percussive drilling tool attached to the bottom of the drill string. It operates using compressed air that drives a piston to strike the drill bit directly at the hole bottom, providing efficient rock breaking in medium to extremely hard formations
2

How do I choose the right DTH hammer and bit for my project?

Consider the following factors:
• Project Type & Geology: Hard, abrasive rock requires button bits with wear-resistant carbide; fractured formations benefit from drop-center face designs
• Hole Diameter & Depth: Ensure your compressor can supply sufficient air volume and pressure for the specific hammer size and drilling depth
• Equipment Compatibility: Check if components are cross-brand compatible (e.g., SD, DHD, MISSION standards) to reduce replacement costs
3

Which DTH bit face design should I use?

• Flat Face: Best for hard, abrasive rock; offers strong wear resistance and good hole stability
• Concave Face: Ideal for medium-hard rock and general blast hole drilling; improves hole cleaning
• Drop Center Face: Suitable for fractured formations and broken ground; provides better hole centering and control