| 摘要 |
PURPOSE: A manual pump for blasting hole drilling is provided to discharge the foreign matters from a hole by using the pressure difference in the space of a check valve. CONSTITUTION: A manual pump(1) for blasting hole drilling comprises an L-shaped pipe(2), a check valve(3) having many prominences and depressions(6) on the outer face, a stopper(5) fixed through the pipe behind the check valve, and a ball(4) inserted in between the rear end of the check valve and the stopper and reciprocating in the pipe. The outer diameter of the front end of the check valve is the same or longer than the outer diameter of the pipe to cover the front end of the pipe. The distance between the rear end of the check valve and the stopper is 7-20cm. Upon reciprocating the pipe in the hole of the rock, the ball reciprocates in the space between the rear end of the check valve and the stopper. Then pressure difference is generated between the inner space of the pipe and the space of the hole. Therefore, the foreign matters in the hole flow into the check valve.
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