| 摘要 |
An air pressure reused pneumatic hammer drill comprises a rotary driven head, a housing and a ground entry and operation unit which includes a pneumatic hammer duct to hold a hollow pneumatic hammer piston and a drill, an integrated hood with an air cycling chamber communicating with the pneumatic hammer duct, a stone discharge duct which has a first stone and air discharge duct at an upper side communicating therewith, a discharge air inlet running through the integrated hood and communicating with the air cycling chamber, and an air discharge duct communicating with the discharge air inlet and the first stone and air discharge duct. The discharge air inlet and the air discharge duct are interposed by a check valve. Thus the invention not only can save electricity resource to reduce cost, but also can shorten working hours to save manpower to meet requirements in engineering industry.
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