| 摘要 |
A drill bit exchange device for a shield tunneling machine includes: a housing with an aperture; a valve body housed in a chamber of the housing, the valve body being pivotable about a pivot axis (Ob) inclined at a predetermined angle with respect to an axis perpendicular to the front of a cutter head; a bit-housing hole formed in the valve body to detachably accommodate a bit; and an exchange seal recess located at the front of the chamber and at a symmetrical position from the aperture with respect to the pivot axis (Ob). The valve body is pivoted about the pivot axis (Ob) to move the bit, which faces the aperture, to the exchange seal recess, allowing the bit to be removed from the bit-housing hole and exchanged. |
