The DTH Hammer is an important tool commonly used in rock drilling. Its working principle is based on pneumatics and mechanical percussion. It usually consists of a piston, cylinder, drill bit and guide device.
First of all, the operation of the DTH Hammer requires a stable compressed air supply system. Compressed air is delivered via a hose from the air compressor to the DTH Hammer. Inside the impactor, compressed air enters the cylinder and is applied to the piston.
The piston is one of the most important parts of the DTH Hammer. When compressed air enters the cylinder, the piston moves downward under the action of air pressure. This movement is caused by the rapid expansion of high-pressure gas in the cylinder, thereby promoting the movement of the piston. This movement is cyclic, with the piston continually moving up and down due to the continuous supply of compressed air.
The downward movement of the piston plays a key role in the drilling process. As the piston descends, it transfers impact energy to the drill bit attached to its base. The design of drill bits usually includes a groove or dimple to ensure that the movement of the piston effectively transfers energy to the drill bit. Once the piston hits the drill bit, it creates a series of rapid impacts directly on the rock or ground surface.
The force of this impact breaks up the rock or ground and forces the drill bit to continue drilling downward. While drilling, channels are designed inside the impactor to flush out the debris and dust generated from the drilled hole. This ensures that the drill hole remains clear while also reducing wear on the drill bit and hammer.
In some applications, DTH Hammer can also be used with a rotating mechanism to ensure accuracy and straightness of drilling. This rotating mechanism usually consists of a drill rod and a rotating device connected to the impactor.
In general, the working principle of the DTH Hammer is to use the mechanical impact force generated by compressed air to achieve efficient drilling of rocks or ground through the cooperation of the piston and the drill bit.
