| 摘要 |
A drilling apparatus for an excavator is provided to form a hole on the ground without causing much pollution of the soil, and effectively reduce the cost. A drilling apparatus for an excavator is connected to a leader of a crane, to be movable upward and downward to form a hole on the ground. The perforator device comprises a hollow main body(100), a main cutter(200), and a driving unit. The main body is opened at the lower side and connected to the leader to be movable upward and downward. The main cutter is mounted integrally and rotatably to the lower end of the main body. A plurality of cutter blades are formed at the lower end of the main body, to perforate the ground in a cylinder form. The driving unit is installed in the main body to rotate the main cutter. The main body is connected to a driving shaft of a motor, which is mounted to the leader to be movable upward and downward. Air-jet holes and water-jet holes are arranged at intervals along the circumference of the main cutter.
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