Adjustable shaped charge device and blasting method for bench blasting in open-pit mines

By designing an adjustable shaped charge shroud and highly elastic counterweights, the adaptability and positioning issues of shaped charge devices in open-pit mine bench blasting were resolved, achieving uniform distribution of blasting energy and improved fragmentation effect, while reducing construction difficulty and safety risks.

CN122305878APending Publication Date: 2026-06-30NORTH BLASTING TECH
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Patent Information

Application Number
CN202610683836.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-18
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing open-pit mine bench blasting, shaped charge devices have fixed shaped charge direction and range of action, lack axial positioning and adaptive adjustment capabilities, and cannot adapt to changes in lithology and the requirements of borehole layout, resulting in uneven blasting, root residue, and a high rate of large blocks.

Method used

An adjustable shaped charge shroud is used, which, through a cross-shaped buckle design and a highly elastic bottom cylindrical counterweight, enables adaptive adjustment of the width and direction of the shaped charge jet. Combined with a detachable structure made of PVC material, it is easy to quickly assemble and adjust on site, ensuring that the shaped charge jets converge in the rock strata to form a continuous fracture surface.

Benefits of technology

It achieves uniform distribution of blasting energy, reduces the root ratio and block ratio, improves blasting efficiency and safety, adapts to the charging requirements of different step heights and apertures, and enhances blasting quality.

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Abstract

This invention discloses an adjustable shaped charge device and its blasting method for bench blasting in open-pit mines, relating to the field of engineering blasting technology. The adjustable shaped charge device includes: an adjustable shaped charge liner, lifting holes, a sheath, a transverse groove, a cross-shaped buckle, an adjustable liner, linear shaped charge slots, and a bottom cylindrical counterweight. Lifting holes are provided on both sides of the top of the adjustable shaped charge liner. A sheath and a transverse groove are provided on the upper part of the inner wall of the adjustable shaped charge liner. The sheath is detachably connected to the adjustable liner via cross-shaped buckles. The linear shaped charge slots are provided at both ends of the adjustable liner, and the bottom of the adjustable liner is fixedly connected to the bottom cylindrical counterweight. The entire adjustable shaped charge device is placed at the bottom of the blast hole. This invention solves the problems of uneven energy distribution, unstable fragmentation effect, and high root ratio and large block ratio in existing technologies under complex rock strata conditions.
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