The DTH hammer is a tool commonly utilized in underwater operations; it primarily achieves its percussive action by harnessing the buoyancy of air bubbles within the water. The working principle of the DTH hammer is as follows:

1. Bubble Generation and Storage: The interior of the DTH hammer features a built-in cavity. When the hammer is submerged, water flows through intake ports located at its base into this internal cavity, resulting in the formation of air bubbles within the chamber.

2. Bubble Contraction and Expansion: Gas ​​is expelled through jet ports at the base of the hammer into the surrounding water, triggering a process of compression and expansion within the bubbles contained in the internal cavity. The compression of the bubbles generates instantaneous pressure, while their subsequent expansion produces a powerful impact force.

3. Underwater Impact Transmission: As the bubbles expand, they generate shockwaves that propagate through the water. By leveraging the elastic properties of water, these shockwaves effectively transmit energy into the underlying underwater geological strata, thereby enabling the execution of underwater engineering operations.

4. Percussive Effect: Upon reaching the geological strata, the shockwaves induce effects such as rock fragmentation and stratum displacement, thereby achieving the desired percussive result. This mechanism facilitates the execution of various underwater operations, including drilling, mining, and blasting.

In summary, the DTH hammer operates by generating air bubbles underwater and utilizing the cyclical compression and expansion of these bubbles to produce shockwaves. By transmitting this energy into the underwater geological strata, the tool effectively executes percussive operations within the aquatic environment. This fundamental working principle establishes the DTH hammer as an indispensable tool in the field of underwater engineering.