A Down-The-Hole (DTH) hammer is a powerful drilling tool that uses compressed air or hydraulic pressure to deliver high-frequency percussive blows to a drill bit. The hammer is located at the bottom of the drill string, right above the bit, which allows it to transfer maximum energy directly to the rock. This direct impact makes DTH hammers exceptionally effective for drilling in hard and abrasive rock formations, as they crush the rock into small chips. The hammer’s internal piston is driven by the fluid, creating a powerful hammering action while the drill string slowly rotates.
DTH Hammer For Air Drilling:
150-300 MM
Application:
Water Well & Mining
Suitable Formation / Strata:
Medium & hard
Direct Percussion
High Efficiency
Durable Design
Air-Driven Mechanism
Best Size Range
Suitable for Hard Formations
Detailed Description:
The DTH hammer operates on a simple but powerful principle. Compressed air is supplied from a surface compressor and travels down the hollow drill pipe to the hammer. Inside the hammer’s casing, a piston is driven up and down by the compressed air. This rapid, reciprocating motion causes the piston to strike the shank of the drill bit hundreds of times per minute. The energy from these blows is what breaks the rock. As the air exits the hammer, it carries the rock cuttings (chips) up the annulus (the space between the drill pipe and the borehole wall) to the surface. This continuous cleaning action is crucial for preventing the bit from getting bogged down and ensuring efficient drilling. The combination of percussive action and slow rotation of the drill string allows the DTH hammer to create a perfectly round and straight borehole. The hammers are made from high-quality steel and are heat-treated for superior hardness and wear resistance, allowing them to perform reliably in tough conditions.
How is a DTH hammer powered?
DTH hammers are primarily powered by a high-pressure air compressor. The compressed air is supplied through the drill pipe and is used to drive the hammer’s piston and flush the cuttings from the hole.
What is the primary function of a DTH hammer?
The primary function of a DTH hammer is to deliver a powerful percussive force to the drill bit, which is the main mechanism for breaking hard rock formations.
Can a DTH hammer be used for all types of rock?
While versatile, DTH hammers are specifically designed for and most effective in medium to hard rock formations. For very soft ground, other drilling methods like rotary drilling might be more suitable.
