Hemispherical Trunkline Delay Detonator for Uniform Shock Wave Transmission

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Solution Overview

Problem

Conventional trunkline delay detonators suffer from energy loss and debris generation due to poor contact with shock tubes, leading to incomplete detonation and environmental pollution from heavy metals in explosives.

Innovation Solution

A trunkline delay detonator design with a hemispherical casing and less sensitive explosives like tricinate or diazodinitrophenol, combined with a connector that maintains shape during detonation, ensures stable and uniform shock wave transmission to shock tubes, reducing debris and environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a flat surface design is used for the trunkline delay detonator, then manufacturing is simpler, but shock waves are not uniformly applied to shock tubes causing energy loss

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidshock wave energy loss

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The upper end of the trunkline delay detonator is designed with a hemispherical shape instead of a flat surface. This curved geometry enables uniform contact with multiple shock tubes arranged radially around it, ensuring that shock waves are evenly distributed to all shock tubes during detonation, thereby eliminating energy loss due to poor contact.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Power

If a sensitive and powerful explosive like lead azide is used, then detonation power is increased, but debris is generated that cuts off shock tubes causing blast failure

Engineering Contradiction:

Improvedetonation powerVSAvoiddebris generation

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The explosive material is changed from sensitive and powerful lead azide to less sensitive alternatives such as tricinate or diazodinitrophenol. This parameter change in explosive chemistry maintains sufficient detonation power for reliable shock tube ignition while dramatically reducing the generation of debris that would otherwise cut off shock tubes and cause blast failure.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the connector is made with conventional materials, then ease of manufacture is improved, but the connector explodes during detonation generating large amounts of debris

Engineering Contradiction:

Improveconnector manufacturingVSAvoidconnector debris

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The connector is constructed from composite materials or materials with high heat resistance and structural stability that can withstand the extreme conditions of detonation without exploding. This material selection prevents the connector from generating debris during detonation, eliminating the cut-off phenomenon while maintaining manufacturability.

Inventive Principle:

Principle #40Composite materials

4Reliability

If lead azide is used in the detonator, then detonation reliability is improved, but environmental pollution from heavy metals occurs

Engineering Contradiction:

Improvedetonation reliabilityVSAvoidenvironmental pollution

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The explosive composition is changed from lead azide to lead-free alternatives such as tricinate or diazodinitrophenol. This chemical parameter change eliminates heavy metal content in the explosive, preventing environmental pollution from lead contamination while maintaining the detonation reliability needed for reliable shock tube ignition and blast initiation.

Inventive Principle:

Principle #35Parameter changes

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 design improves detonation reliability by minimizing energy loss and preventing cut-off phenomena, while using non-heavy metal explosives to reduce environmental pollution and maintain connector integrity during detonation.

Implementation Method 1

an explosive is inserted into the detonation tube... when the trunkline delay detonator detonates, an explosion signal is transmitted

Methodology Applied

Scientific EffectDetonation: Detonation

Implementation Method 2

shock waves are not uniformly applied to the shock tubes during detonation of the detonator... shock waves without influencing other shock tubes

Methodology Applied

Scientific EffectShock wave: Shock Wave

Data Source

PatentUS11054235B2Trunkline delay detonator and blast-triggering device using same

Publication Date: 2021.07.06 HANWHA CORP

AI summary

The present disclosure relates to a trunkline delay detonator and a blast-triggering device using the same. In the blast-triggering device, a trunkline delay detonator is inserted into a connector in such a manner that a plurality of shock tubes connected to a detonator for initiating an explosive are interposed between the connector and the trunkline delay detonator, so that an explosion signal is applied to the shock tubes by detonation of the trunkline delay detonator. In the blasting detonator, close contact between the outer surface of the trunkline delay detonator and the shock tubes is improved, whereby energy lost in an explosion is reduced and an explosion signal is stably and uniformly applied to the shock tubes by using powder which has a weak explosive power and is relatively insensitive compared to conventional powders.