Friction-modified wedge stemming plugs
Australia Patent
Stats
Importance
Abstract
A stemming plug (10) for stemming a blast hole in a mine, the plug (10) comprising an active wedge-shaped member (12) having a sloping face received in sliding relationship with a matching face of a passive wedge- shaped member (14). In use, the active wedge-shaped member (12) is positioned nearest to an explosive material in the blast hole and the passive wedge-shaped member (14) is positioned further from the explosive material in the blast hole. The active wedge-shaped member (12) has a friction reducing material provided on at least part of its surface to reduce the sliding resistance of the active wedge-shaped member (12) relative to the passive wedge-shaped member (14); whereby, in use, when a shockwave from initiation of the explosive material in the blast hole encounters the active wedge-shaped member (12) it acts as a piston, sliding on the passive wedge-shaped member (14) so that both wedge-shaped members exert diametrically opposed forces against a wall of the blast hole and are locked in place.
First Claim
Family
International Classification(s)
Cited Art Landscape
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address