| 摘要 |
PURPOSE:To reduce an outbreak section to prevent the crunch of large-sized gravel or normal gravel and to prevent the abrasion in a gravel crusher to promote excavation efficiency. CONSTITUTION:A plurality of cutter heads 3a are shifted back and forth in the direction of the excavation to arrange, and gravel crushing roller cutters 11 are provided to the sides of the cutter heads 3a. A large-sized roller cutter 12 cruching gravel between the large-sized roller cutter and roller cutters 11 is provided to rotational shafts 2 adjacent to the roller cutters 11, an outbreak section is reduced and, at the same time, gravel between the peripheral surfaces of the cutter heads 3a and rotational shafts 2 is crushed between the roller cutters 11 and large-sized roller cutter 12. The outbreak section is reduced to prevent the cruch of large-sized gravel or normal gravel, and the abrasion of the device is prevented to promote excavation efficiency. |
