DTH hammer with DTH bits

DTH (Down-the-Hole) hammer is a tool used in various drilling applications, particularly in mining, quarrying, and construction. It is designed to create a powerful hammering action to break and crush rocks or other hard materials.

Here's how a DTH hammer works:

Drilling Rig Setup: A drilling rig is set up at the drilling site, which includes a drill pipe, a rotary head, and a DTH hammer.

Drill Pipe and DTH Hammer Connection: The DTH hammer is connected to the bottom end of the drill pipe, forming a continuous drill string.

Hammering Mechanism: The DTH hammer consists of a piston that moves inside a cylinder. The piston strikes the back end of the drill bit, creating a powerful impact force.

Air Supply: Compressed air is supplied to the DTH hammer through the drill pipe. The air enters the hammer's cylinder, pushing the piston back and compressing a spring.

Impact: When the compressed air reaches a certain pressure, it is released, propelling the piston forward. The piston strikes the back end of the drill bit with high energy, creating a rapid succession of impacts.

Drill Bit Rotation: Simultaneously, the rotary head of the drilling rig rotates the entire drill string, including the DTH hammer and the drill bit. This rotation helps to break and crush the rock formation.

Rock Fragmentation: The repeated impacts from the DTH hammer's piston, combined with the rotational force of the drill bit, fracture and disintegrate the rock formation. The crushed rock fragments are then flushed out of the borehole by air or water.

The DTH hammer's main function is to provide a powerful and efficient drilling action, enabling the penetration of hard materials like rocks. It is commonly used in applications where conventional drilling methods may be ineffective or time-consuming.