Lead-Free Electric Detonator with Composite Priming Charge
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Solution Overview
Problem
Conventional electric detonators containing lead face environmental concerns and exhibit impaired low-temperature performance when using lead-free alternatives like silver azide, necessitating a reliable and compact lead-free solution with improved temperature characteristics.
Innovation Solution
A lead-free electric detonator design featuring a cap with a priming charge comprising potassium 4,6-dinitrobenzofuroxane and silver azide as primary explosives, along with cyclotrimethylenetrinitramine as a secondary explosive, arranged in layers, and a zirconium thin film resistor element for enhanced sensitivity and temperature stability, with electrical insulation using steatite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-containing primers are replaced with lead-free alternatives like silver azide, then environmental friendliness is improved, but low-temperature performance deteriorates
Solution Approach 1:
The patent combines silver azide (second primary explosive) with potassium 4,6-dinitrobenzofuroxane (first primary explosive) to create a composite priming charge. This composite structure allows the silver azide to provide environmental friendliness while the potassium 4,6-dinitrobenzofuroxane compensates for low-temperature performance deficiencies, achieving both ecological safety and reliable low-temperature operation.
2Object-affected harmful factors
If lead-free alternatives are used, then environmental safety is improved, but sensitivity at low temperatures deteriorates
Solution Approach 1:
The invention creates a composite priming charge where potassium 4,6-dinitrobenzofuroxane serves as the first primary explosive layer with high low-temperature sensitivity, while silver azide serves as the second primary explosive layer providing environmental safety. The layered composite structure ensures both environmental compliance and adequate sensitivity across temperature ranges.
3Object-affected harmful factors
If conventional lead-free designs are used, then environmental friendliness is improved, but device size and weight increase
Solution Approach 1:
The patent employs a layered structure where each layer of the composite priming charge (potassium 4,6-dinitrobenzofuroxane and silver azide) is optimized for specific local functions. This local optimization allows the overall device to achieve compact dimensions and reduced weight while maintaining environmental friendliness, as each layer contributes efficiently to the detonation process without requiring excessive material quantities.
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 solution provides a compact, reliable, and environmentally friendly electric detonator with improved low-temperature performance and flexible production, ensuring effective detonation across a wide temperature range.
Implementation Method 1
a zirconium thin film resistor element for enhanced sensitivity and temperature stability
Implementation Method 2
the two primary explosives and the secondary explosive are arranged in layers, in an increasing degree of sensitivity, bearing one against the other
Data Source
AI summary
The present invention relates to an electric detonator (1) comprising a cap (2), comprising a priming charge (3) and an electrode (4), comprising a positive pole, a negative pole and a resistor element (8), the said priming charge (3) comprising at least two primary explosives, a first primary explosive (9) and a second primary explosive (10), and at least one secondary explosive (11). The electric detonator is characterized in that the two primary explosives (9, 10) and the secondary explosive (11) are arranged in layers, in an increasing degree of sensitivity, bearing one against the other, wherein the first primary explosive (9), constituting the most sensitive of the two primary explosives (9, 10), is arranged closest to the resistor element (8), and in that the second primary explosive (10) is arranged thereafter between the first primary explosive (10) and the secondary explosive (11). The invention also relates to a production method for the said electric detonator (1).