BORING APPARATUS FOR EXCAVATION

摘要

PURPOSE: A punching device for excavation is provided to increase the pressure to a piston by minimizing the flow resistance of the air. CONSTITUTION: A check valve part(120) induce a pneumatic pressure supplied to the upper end of a sleeve tube(110). An air distributor(130) has a guide curve part(131) and makes the pneumatic pressure passing through the check valve part be distributed towards the inner surface of the sleeve tube. A cylinder(140) is connected to the lower part of the air distributor and has a first path(201). A piston(150) is ascended and descended and inserted into the cylinder and has a second path(202). A bit part(160) is installed in and moves on the bottom of the sleeve tube. The bit part receives the thrust force from the piston and drills the ground. An air guide part(170) is mounted on the upper part of the air distributor and guides the air to the first path.