| 摘要 |
PURPOSE: An air injection excavator is provided to prevent the top ground from collapsing by spraying water and air at the same time, and to improve the speed of excavating. CONSTITUTION: An air injection excavator comprises a screw, a casing(40), a chamber unit(220), a control unit(210), an air pressure control member(200), an air supply pipe, an air spray member(300), an air pressure sensor(430). The casing covers the screw. The chamber unit is formed between the casing and a linear conductor, and receives air. The control unit controls an air gap when the air flows in through the casing. The air supply pipe sprays the air toward the front surface of the linear conductor. The air spray member is composed of a nozzle, and is formed in the air supply pipe. The air pressure sensor measures the air pressure in the chamber unit.
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