DINOSAW DTH Drilling Machines for Stone Quarrying & Rock Mining

DTH (Down-The-Hole) drilling places the hammer at the bottom of the drill string, directly above the drill bit, delivering percussion energy directly to the rock face. This makes DTH drilling more efficient in hard materials like granite and marble, with energy transfer efficiency up to 80% compared to just 40-55% in rotary systems.

Rotary drilling relies on rotation and downward pressure from the surface, with energy traveling through the entire drill string before reaching the bit. This energy loss through the drill string makes rotary drilling less effective for materials with compressive strengths exceeding 100 MPa.

For stone quarrying operations, DTH drilling typically achieves 3-5 times faster penetration rates in hard stone compared to rotary methods, while also creating straighter holes with deviation as low as 0.5% of depth - critical factors for efficient stone extraction and precise block separation.

DINOSAW DTH drilling machines offer a range of hole diameters to accommodate various quarrying and construction applications:

The QKZ90 series (models P and E) can drill holes from Φ65mm to 90mm in diameter with high precision (±5mm deviation per 10m depth), ideal for most stone block extraction work and applications like anchor holes in construction or diamond wire saw insertion points.

The QKZ165-H model extends capabilities further, handling hole diameters from Φ90mm up to 165mm with the same precision standards, suitable for larger-scale quarrying operations, blast hole drilling, and foundation work requiring substantial anchoring systems.

These diameter ranges cover 95% of stone extraction requirements in the industry, from dimensional stone production to construction applications, allowing quarry operators to select the appropriate machine for their specific material properties and production targets.

DINOSAW DTH drilling machines offer depth capabilities that vary by model:

The QKZ90-P pneumatic model can reach maximum drilling depths of 35 meters with hole deviation less than 1%, suitable for most quarrying applications and exceeding the industry average depth capacity by approximately 15%.

The QKZ90-E electric model extends this capability to 40 meters with the same precision standards, providing additional depth for deep deposit extraction and specialized geotechnical applications.

The QKZ165-H hydraulic model achieves depths up to 30 meters while handling larger diameter holes (up to 165mm), delivering the optimal balance of depth and diameter for commercial quarrying operations.

These depth capabilities can be extended by adding additional drill rods as needed for specific projects. Each machine's standard configuration includes appropriate-length drill rods (typically 1-1.5m sections) that can be connected to reach the required depth while maintaining drilling accuracy.

DINOSAW offers DTH drilling machines with three distinct power source options to accommodate different operational environments and project requirements:

Pneumatic (QKZ90-P): Powered by compressed air (12-14 m³/min at 0.5-0.7 MPa), this model offers good mobility and operational simplicity, ideal for remote locations without reliable electricity. The pneumatic system provides robust performance in harsh environments and requires minimal maintenance, making it practical for isolated quarry operations.

Electric (QKZ90-E): Featuring electric rotary power with pneumatic feed (requiring 7-9 m³/min air), this hybrid model provides cleaner operation with reduced air consumption (approximately 35% less than fully pneumatic models), suitable for operations with access to stable power supplies and where environmental considerations are important.

Hydraulic (QKZ165-H): Utilizing hydraulic systems for both rotation and feed functions, this powerful model works well in demanding applications, handling larger hole diameters while maintaining precise control. The hydraulic system delivers high torque (up to 1650 N·m) and consistent performance regardless of ambient temperature variations.

All models can be customized with alternative power configurations based on specific operational requirements and site conditions, ensuring optimal performance across various quarrying environments.

When encountering DTH drilling issues, follow these systematic troubleshooting steps to quickly identify and resolve problems:

Poor Penetration Rate: Check air pressure first - ensure it's within 0.5-0.7 MPa range. Inspect drill bit for excessive wear (replace if button height is reduced by >30%). Verify rotation speed (15-25 RPM is optimal for most stone applications). For hard formations like granite, reduce feed pressure initially to allow bit stabilization before applying full pressure.

Hammer Stalling: Usually indicates insufficient air volume. Verify air compressor output meets machine requirements. Check for air leaks along supply lines and connections. Ensure hammer lubrication system is functioning properly.

Excessive Bit Wear: Most commonly caused by improper rotation speed or feed pressure. Maintain proper rotation-to-percussion ratio for specific stone types (slower in abrasive stones like granite). Ensure sufficient lubrication to reduce friction heat. When drilling through varied stone layers, adjust parameters to match the hardest material present.

Hole Deviation: Check alignment of drill guide mechanisms. Reduce feed pressure when starting holes. Ensure drill string components are straight and threads are in good condition. In layered or fractured stone, start with lower percussion energy until hole is established.

DINOSAW provides 24/7 technical support , and our service technicians can remotely diagnose many issues through our optional telemetry system to minimize downtime.