| 摘要 |
PURPOSE: A horizontal directional drilling reamer is provided to improve the working efficiency, to quickly and accurately perform drilling, and to form a solid excavation hole because track changing of a reamer is prevented. CONSTITUTION: A horizontal directional drilling reamer comprises a driving rod(4), a conic head portion(2), a cylindrical straight body(6), a plurality of hammers(7), an inclined hammering unit(17), a plurality of discharge holes(18), and an air supply pipe(13). The driving rod supplies the torque by being connected to a digging equipment, water, and bentonite mixture at the same time. The driving rod is connected to a front-end part of the conic head portion. The conic head portion comprises a plurality of injection nozzles and tips. The cylindrical straight body is formed in the rear-end part of the conic head portion to be integrated and an air tank(11) is installed inside of the cylindrical straight body. The plurality of hammers is exposed through holes punched in all directions of the conic head portion. A hammer body is fixed and installed inside of the cylindrical straight body, thereby moving forward and backward by the pneumatic pressure supplied from the air tank. The inclined hammering unit is formed in the hammer head. The plurality of discharge holes is formed in the hammer head so that the bentonite mixture is sprayed. The air supply pipe is connected to the rear-end part of the cylindrical straight body and supplies the pneumatic pressure from outside to the hammers.
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