Lifting Plug Thermal Fuse Venting High Explosive Projectile Safety
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Solution Overview
Problem
Conventional safety devices for high explosive projectiles, such as artillery shells, face issues where bolts can become lethal projectiles due to explosive power, and the weight of the shell is not properly managed during handling, leading to safety risks during unexpected events like fires or terrorism.
Innovation Solution
A lifting plug with a thermal fuse is designed, featuring a plug body, handle, and a window secured by a bolt, where the thermal fuse ignites at lower temperatures than the main charge, removing the window to form a vent without igniting the main charge, and the bolt remains connected, preventing explosion and ensuring safe handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal fuse with explosive power is used to form a vent, then safety against explosion is improved, but bolts may be removed and fly away like lethal projectiles
Solution Approach 1:
The lifting plug is divided into separate components: a plug body that remains attached to the shell, and a removable window portion. When the thermal fuse detonates, only the window is ejected through the formed vent while the main plug body and bolts remain attached to the shell, preventing bolts from becoming lethal projectiles.
Solution Approach 2:
The window portion is extracted as a separate removable component from the main plug body. This extraction allows the window to be selectively ejected by the thermal fuse explosive power while leaving the main plug structure and bolts intact on the shell.
2Strength
If bolts are used to secure the lifting plug, then structural integrity is improved, but bolts may be removed by explosive power and become harmful
Solution Approach 1:
The lifting plug is segmented into a permanent plug body that retains bolts for secure attachment, and a separate removable window. This segmentation ensures bolts remain with the plug body on the shell while the window can be safely ejected.
3Reliability
If the thermal fuse is positioned to remove the window, then vent formation is improved, but the bolt connection may be compromised
Solution Approach 1:
The plug structure is segmented so the window is a separate removable portion secured by the bolt, while the main plug body remains permanently attached. The thermal fuse positioned under the bolt ejects only the window portion, preserving the bolt connection to the main plug body.
Solution Approach 2:
The window portion is extracted as a separate component that can be selectively removed by the thermal fuse explosive force, while the main plug body and bolt connection remain intact on the shell.
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 effectively prevents the explosion of high explosive projectiles by inducing thermal fuse burning at lower temperatures, ensuring the bolt remains attached and the weight of the shell is not applied to it, enhancing safety during handling and storage.
Implementation Method 1
a thermal fuse 7 charged under the bolt 4 such that when the thermal fuse 7 is ignited, the window 3 can be removed from the plug body 1 by explosive power generated due to ignition of the thermal fuse 7
Implementation Method 2
explosive power generated due to ignition of the thermal fuse 7
Data Source
AI summary
The present invention relates to a lifting plug for a high explosive projectile capable of forming a vent by a thermal fuse, in which the lifting plug is mounted to a front part of a shell of the high explosive projectile such that the vent can be formed in the lifting plug by the thermal fuse when unexpected accidents such as fires or terrorism occur during storage of the high explosive projectile, so the lifting plug can induce burning or deflagrating of the thermal fuse without allowing the high explosive projectile to be detonated or exploded by accumulated heat in the high explosive projectile due to the vent, thereby improving safety of the high explosive projectile.