CUTTER-BIT EXCHANGE MECHANISM FOR SHIELD MACHINE

摘要

PROBLEM TO BE SOLVED: To exchange a cutter bit at a cutter central section. SOLUTION: A cylindrical cutter rotating shaft 5 is installed, penetrating to a cutter 6 at the center of the cutter 6, a cutter central section 12 abutted against a cutting edge 11 in the case of forward movement while being retracted into a shield machine 1 in the case of retraction is mounted slidably in the axial direction of the cylindrical cutter rotating shaft 5 on the inside of the cutter rotating shaft 5, and a gate 21 partitioning the inside of the cutter rotating shaft 5 before and behind in front of the cutter central section 12 when the cutter central section 12 is slid backwards is secured to the cutter rotating shaft 5.