COMBINED PLUG Russian patent published in 2009 - IPC F42D1/08 

FIELD: mining engineering.

SUBSTANCE: device relates to drilling-and-blasting in competent formation field and can be used in different fields, using blasting in rocky formation massif. Combined plug contains bulk material 6 and cylinder 1 with channel for conductor of initiating pulse. Cylinder 1 is filled by bulk material and is implemented from plastic with openings 4, uniformly distributed by its sides. In bottom part cylinder 1 allows conical basis with vertex of cone angle from 60° up to 110°. From outer face of cylinder 1 it is installed rubber covering 2. Device diametre is accepted equal to 0.9-0.95D, where D - well bore, m, device's height is accepted not less than 2.5D. Internal diametre 4 is accepted equal to 0.1D. Distance between openings row 4 by vertical line is accepted equal to 0.3D. Channel for conductor of initiating pulse is implemented in the form of longitudinal hollow in cylinder 1.

EFFECT: invention provides design simplification, laboriousness reduction of installation and plug's cost price, and also safety increasing of mining implementation.

2 dwg