BLAST-HOLE PLUG Russian patent published in 2009 - IPC F42D1/08 

FIELD: explosive materials.

SUBSTANCE: this invention relates to drilling and blasting operations, particularly to blocking of light-end explosion products in charge hole - i.e. blast hole and can be used at mining enterprises. Blast-hole plug contains cylindrical shells 1 with parting walls 4 and ridges 7. The shell is equipped with fixation device 3 and internal sealing valve 6 mounted in its tail end. Channel 2 is made in the shell body with the possibility of installation in it fixation device 3 of adjacent shell. Cone-shaped parting walls 4 in the with holes 5. The ridges 7 are made of rubber and helical curve positioned with a 45-70-degree slope to horizon with lead equal to 2D. Shell length 1 is taken as 6-8D where D is a blast-hole diametre, m.

EFFECT: design simplification, reduction in working hours of installation, mining safety improving, stemming cost saving.

2 dwg