Development of Prototype Quiet Hard Rock Stoper Drill. Volume 1

摘要

The report describes the design, development, and manufacture of a prototype quiet hard-rock stoper drill and results of its field tests. It is shown that the stoper drill noise level can be reduced from 118 dBA to below 100 dBA by using the design. The design concept of the drill is based on a valveless independent rotation system and use of an integral muffler and pivot mount. The drill was manufactured in a standard commercial drill manufacturing setup and organization. The design and production technology proved that commercially viable quiet drills can be made available for mine use.