| 摘要 |
<p>PURPOSE: To securely unload excavation rubbish with a simple configuration by alternately covering or opening the end face side openings of two transport cylinders at the outflow end of a rotary switching pipe where an inflow end is connected to a leading pipe. CONSTITUTION: A leading pipe 11 is provided on a center axis line at the opposite side of an excavation head 1 of a partition wall 7 for forming an excavation chamber 9, and two transport cylinders 14 and 14 with transport pistons 16 and 16 that are driven by opposite cycles in parallel with the leading pipe 11. The leading pipe 11 and the transport cylinder 14 can connect both the end face side openings being directed toward the excavation chamber 9. Then, at the side of the excavation chamber 9 of the partition wall 7, a rotary switching pipe 17 that is bent in a U shape and can rotate around the center axis line commonly with the excavation head 1 is provided. The outflow end of the rotary switching pipe 17 is connected to the opening of the leading pipe 11, and the inflow end 18 covers the opposite side opening of the transport cylinder 14 during the push-out process of the transport piston 16 and is opened toward the excavation chamber 9 during a suction process.</p> |
