Blast-Hole Jet Units Using Shaped-Charge Detonation
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Solution Overview
Problem
Current blast-hole blasting methods face inefficiencies due to manufacturing limitations of explosives and conceptual limitations of detonators, leading to issues such as the channel effect, dead pressing, and loss of detonation power, especially in narrow drilling patterns or deep holes, which restrict the application of air-deck charging methods.
Innovation Solution
The use of a jet unit comprising liners, spacers, and fittings that act as explosives and detonators, employing a shaped charge effect to induce jet detonation, which accelerates the detonation reaction and maximizes explosive energy use by creating a stand-off distance and air-deck space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional detonators and explosives are used in blast-hole blasting, then the blasting process can be completed, but the detonation reaction is incomplete and explosive energy is not fully utilized due to manufacturing limitations and conceptual limitations of detonators
Solution Approach 1:
The patent introduces a jet unit as an intermediary component between the detonator and the explosive charge. The jet unit includes a liner and spacer that generate a jet flow to accelerate and enhance the detonation reaction, serving as a mediator that bridges the limitations of conventional detonators and explosives to achieve more complete energy utilization
Solution Approach 2:
The patent changes the physical parameters of the blasting system by introducing a jet flow with specific velocity and pressure characteristics. The jet unit creates a high-velocity jet flow that alters the detonation propagation parameters, enabling more complete and reliable detonation reactions compared to conventional methods
2Productivity
If air-deck charging method is used to improve blasting efficiency, then explosive efficiency increases, but the channel effect and dead pressing occur leading to power loss and detonation halts in narrow drilling patterns or deep holes
Solution Approach 1:
The patent extracts the problematic air-deck space from the blast-hole and relocates it to a separate jet unit component. The spacer creates a controlled air-deck space within the jet unit, separating the function of explosive charging from the air-deck effect, thereby preventing channel effect and dead pressing while maintaining blasting efficiency
Solution Approach 2:
The patent segments the blasting system into distinct functional components: the jet unit (with liner and spacer), the explosive charge, and the detonator. This segmentation allows each component to perform its specific function independently, preventing the channel effect and power loss that occur when air-deck charging is applied to narrow or deep holes
3Loss of time
If the detonation reaction completion time is reduced to maximize explosive energy use, then the ideal blasting mechanism is approached, but the shock wave emission and chemical energy conversion must be accelerated significantly
Solution Approach 1:
The patent employs periodic action through the oscillating jet flow generated by the liner and spacer. The jet flow creates periodic compression and expansion cycles that accelerate the detonation reaction progression, significantly reducing the completion time while maintaining high shock wave emission power through the cyclic energy transfer
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The jet unit enhances explosive efficiency, reduces completion time of detonation reactions, and improves the channel effect, preventing power loss and detonation halts, allowing for safer and more effective controlled blasting in various environments.
Implementation Method 1
The fundamental structure of the modern-day shaped charge (incorporating the stand-off distance starting with the observation of the cavity effect) took roughly 150 years to establish
Implementation Method 2
a shock wave generated when the explosive is detonated and transmitted to the liner, and the collapsed liner forms the jet of high temperature and high pressure in the axial direction
Implementation Method 3
The detonating action of the detonator can be divided into fragments, heat, and shock waves
Implementation Method 4
the detonation reaction of a charged explosive before the destruction of the blast-hole wall proceeds
Implementation Method 5
The stand-off distance between the liner and the target further enhances the effect
Data Source
AI summary
Liners (150), fittings (11-22), and spacers (23-25) are provided to assemble the jet (170) units, which work as explosives (110) and detonators (120) to form stand-off distance and air-deck (140) space. The liners (150) release jets (170) and the fittings (11-22) and spacers (23-25) are designed to attach the liner (150) firmly to the explosives (110), inducing the cavity effect. The objective of the present invention is to provide a blasting method using a jet (170) unit to overcome the limits of sympathetic detonation, applying a mechanism that is ideal according to the analysis of observations in blast-hole (100) blasting. The application of jet (170) units for jet (170) detonation in blast-hole (100) blasting overcomes the performance limits of explosives (110) manufacturing and the conceptual limits of detonators (120) functionalities and improves the channel effect, dead pressing, loss of power, and stopping of detonation etc. Particularly, the application of controlled blasting and air-decking can be carried out without restriction while maintaining the safety of the slurry or emulsion explosives (110).