| 摘要 |
<p>Disclosed therein is a rotary head of a large-diameter drilling machine, which rotates a rod connected with a head of the drilling machine. The rotary head includes: a gear box being composed of upper and lower flanges and a side plate and having an inner space of a closed structure; an interlocking gear formed in a shape of an annular ring having teeth formed on inner and outer peripheries thereof, the interlocking gear being mounted in the middle of the inner space of the gear box; a plurality of driving gears being smaller than the interlocking gear and being gear-coupled to the outer periphery of the interlocking gear inside the gear box, the driving gears being driven by receiving a driving power of a motor; a center shaft protruding upwardly and downwardly from the upper and lower flanges of the gear box while passing through the inside of the annular ring of the interlocking gear and penetrating the upper and lower flanges of the gear box, the center shaft being gear-coupled with the inner periphery of the interlocking gear and connected with the rod so as to rotate the rod while rotating according to the rotation of the interlocking gear; couplers respectively covering the portions of the center shaft, which respectively protrude upwardly and downwardly from the upper and lower flanges of the gear box, the couplers being fixed to the upper and lower flanges of the gear box through bolt-tightening; and plain bearings made of engineering plastic and contactingly mounted between the center shaft and the couplers.</p> |
