Popular science knowledge of down-the-hole（DTH） hammer
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The down-the-hole（DTH） hammer is an impact rock drilling tool, which is installed in a slender outer cylinder by a piston, an inner cylinder, an air valve seat, a check valve and a drill bit accessory.
The upper end of the outer cylinder is provided with a wrench opening and a connecting thread. The joint and the lower end are equipped with a brazing sleeve for threaded connection. The clamping sleeve is mainly used for the drill bit to transmit propulsion and rotation surge. The snap ring controls the axial movement of the drill bit, and the check valve is used to prevent debris and other debris from entering the hammer when the argon supply is stopped. During the tunneling process, the drill bit is pushed into the hammer and pressed on the clamp sleeve.
At this time, the piston directly impacts the bit for rock drilling. When the drill bit is lifted from the bottom of the hole, the compressed air directly enters the bottom of the hole to blow the slag, and then the hammer repeats the above activities.
The down-the-hole（DTH） hammer is a breakthrough in the rock-breaking method of air drilling technology, and the drilling efficiency is high. Always stay at the bottom of the hole during the rock drilling process, the compressed gas pushes the piston to impact the drill bit to smash the rock, and the slag at the bottom of the hole is blown out from the bottom of the hole by the compressed gas. The rotary motion of the hammer is provided by the slewing head, and the shaft thrust is provided by the propeller, which is transmitted to the hammer through the drill rod. The down-the-hole（DTH） hammer is the core component of the down-the-hole（DTH） drill.
