| 摘要 |
PURPOSE: A mud hammer for underground boring using water pressure is provided to reduce noise and easily remove dust by using water pressure for boring. CONSTITUTION: A mud hammer for underground boring using water pressure comprises a valve housing(300), a guide tube, a mud injection part(500), a piston(600), and a valve(700). The valve housing is installed inside a hammer case equipped with a drill bit. The guide tube is installed in the valve housing. The mud injection part is installed at the upper part of the valve housing. The piston is provided between the guide tube and the drill bit and raised or lowered by a pressure difference. The valve is installed between the valve housing and the mud injection part and raised or lowered by a pressure difference. |
