Small DTH Drilling Rig

Introduction

A small DTH drilling rig is a lightweight, bracket-mounted rock drilling machine built with down-the-hole hammer technology. It is specially designed for efficient drilling in medium-hard to hard rock formations, making it ideal for small-scale construction, mining, slope anchoring, and water well projects. Compared with crawler and vehicle-mounted drilling rigs, this portable model offers higher flexibility, lower cost, and better performance in narrow spaces, mountainous areas, and uneven job sites.

How Does a Small DTH Drilling Rig Work?

Powered by an external screw air compressor, the small DTH drilling rig uses high-pressure compressed air to drive the DTH hammer. The hammer creates high-frequency impact to break rock while the rotary head provides continuous rotation. This combined action forms clean, stable boreholes efficiently even in tough geological conditions.

Small down the hole drilling Structural composition

Rack Body (Bracket)

It is usually a steel structure frame with fixed legs or a sliding base, which can be moved manually or adjusted in a small range; it can be equipped with a lifting device to adjust the drilling height or angle (such as horizontal drilling, oblique drilling, vertical drilling).

DTH Hammer + Bit

Used to directly contact rock formations and break them through high-frequency impact; the down-the-hole hammer drives the piston to move at high speed through compressed air.

Promotion Agency

It is usually driven by a cylinder or chain, which can achieve stable advancement of the drilling tool; the propulsion force directly affects the drilling depth and efficiency.

Rotating Head (Power Head)

It provides rotary motion for the drill bit and cooperates with the down-the-hole hammer to break the rock. The drive modes include hydraulic, electric or pneumatic.

Air Source System

An external screw air compressor (e.g. 17 bar/24 bar, 10–30 m³/min) is usually required to provide the compressed air required for the down-the-hole hammer to operate.

Control System

Including functions such as propulsion, rotation, take-off and landing, angle adjustment, etc.; high-end models can be equipped with optional wireless remote control or electric control console.

Key Benefits

Compact Structure and Flexible Operation

Small footprint, can be used in narrow, steep and irregular terrain.

Strong Adaptability

Can drill hard rock, soft rock, loose layer and other geological conditions;

Can be used for vertical, oblique or horizontal drilling.

Low Cost

No need for a complete vehicle chassis, the manufacturing and transportation costs are lower than vehicle-mounted drilling rigs;

Suitable for small and medium-sized projects or local projects.

Easy Maintenance

Simple structure, few components, easy to maintain and maintain;

Most parts are highly versatile and easy to replace.

Typical application scenarios

Open-pit mine drilling and blasting

Slope anchor hole drilling

Micro water well drilling

Building foundation drilling

Geothermal holes, small pile holes

Technical parameter reference (example)

Comparison with crawler/vehicle mounted dth drills

conclusion

The bracket-type down-the-hole drill is an economical, practical and adaptable drilling equipment, which is very suitable for projects with complex terrain, limited construction space or limited budget. Especially in blast hole construction, anchor support and small geothermal water well drilling, the bracket-type drill rig has shown strong advantages with its flexibility and high cost performance.

If you have specific construction requirements (such as hole diameter, depth, rock type), I can recommend the appropriate model and configuration for you.