DINOSAW DTH Drilling Machines for Stone Quarrying & Rock Mining

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.

The hammer location decides the physics. In DTH (down-the-hole) drilling, the impact hammer sits at the bottom of the hole behind the bit — impact energy goes directly into the rock face, and energy loss through the drill string stays minimal even at 30–40 m depth. In top-hammer drilling, the hammer is at the surface and impact travels down the rods: at quarry depths, rod coupling losses and vibration eat penetration rate, especially in hard granite and fractured formations. The practical consequences: DTH holds straighter holes at depth, keeps penetrating in hard rock, and wears rods less — which is why DTH is the quarry standard for bench drilling. Top-hammer rigs keep their place in shallow holes and geotechnical work, but bench patterns for block extraction point to DTH. Both rotate — the difference is where the hammer works.

Three variables decide it. Hole size first: Φ65–90 mm pre-splitting and production holes are the QKZ90 machines; Φ90–165 mm large breaking holes are the QKZ165-H. Site infrastructure second: the QKZ90-P runs on quarry compressed air (12–14 m³/min), the QKZ90-E suits sites with reliable electric power (7–9 m³/min air), and the QKZ165-H is fully hydraulic where the hardest rock demands maximum feed control. Rock hardness third: the hydraulic feed of the QKZ165-H holds 2–4 m/h in large hard-rock holes where pneumatic feed would stall. Specify your blast design, air capacity and rock conditions, and DINOSAW matches the model and bit package.

Size the compressor to the model and the hole class. The QKZ90-P needs 12–14 m³/min at 0.5–0.7 MPa — the pneumatic rotary drive consumes air continuously, so undersizing the compressor shows up immediately as stalling feed and slow penetration. The QKZ90-E drops the air demand to 7–9 m³/min because the electric motor drives the rotation; the air feeds the hammer only, which is why electric-drive models suit sites with power lines but modest compressor capacity. The QKZ165-H uses 7–12 m³/min depending on the hole, with hydraulic rotation and feed. Rule of thumb: compressor capacity is the first check after hole diameter — a correctly sized drill on an undersized compressor performs like an undersized drill. Confirm your compressor's free air delivery and pressure with DINOSAW before finalizing the model.