Paste Extrusion Device for Pyrotechnic Tube Ignition
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Solution Overview
Problem
The existing methods for filling and dismantling igniter tubes in propellant charges pose pyrotechnic risks due to the handling of explosive ignition powders, and the complexity of depositing varied geometries of ignition material within combustible tubes is challenging, especially in terms of handling and distribution control.
Innovation Solution
A device comprising mechanical assemblies for holding, positioning, and moving tubes, along with a cartridge system for extruding paste patterns, allowing for precise deposition of ignition charge on the inner or outer surface of tubes with varied geometries, such as circular or helical patterns, using a controlled extrusion nozzle and piston system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If agglomerated powder tablets are used for ignition charge, then the ignition charge can be placed in the combustible tube, but the operation becomes delicate with pyrotechnic risks and requires special tooling for automation
Solution Approach 1:
The invention changes the physical state of the ignition charge from solid tablets to a paste form that can be extruded. This parameter change allows the ignition charge to be deposited continuously without requiring special handling tooling, thereby reducing device complexity while maintaining pyrotechnic safety through controlled deposition
Solution Approach 2:
The invention replaces the mechanical handling of tablets with an extrusion-based deposition system. The paste is extruded through a nozzle under controlled pressure, substituting delicate mechanical tablet placement with a more robust and automatable extrusion process that reduces pyrotechnic risks
2Ease of manufacture
If collodion is loaded in the tube for in situ tablet formation, then the ignition charge can be formed within the tube, but the evaporation time for the solvent becomes long due to confinement
Solution Approach 1:
The invention performs the deposition action beforehand by extruding the paste directly into the desired pattern within the tube. The paste is deposited in its成型 state rather than requiring subsequent evaporation and formation steps, thereby eliminating the time-consuming evaporation process while maintaining the ease of in situ formation
Solution Approach 2:
The invention extracts the solvent evaporation step from the manufacturing process by depositing the ignition charge as a paste that maintains its shape without requiring complete solvent evaporation. This removes the time-consuming evaporation phase while preserving the benefit of in situ formation
3Ease of operation
If ignition charge is extracted by direct contact for dismantling, then the igniter tube can be dismantled, but pyrotechnic danger is generated
Solution Approach 1:
The extruded paste forms a cohesive structure that acts as an intermediary between the ignition powder and external handling. This cohesive paste structure allows for safer manipulation and extraction compared to loose powder, reducing pyrotechnic danger while maintaining ease of dismantling operations
4Ease of operation
If flexible sheets with adhesive are used to hold powder piles, then the powder can be inserted in the combustible tube, but the implementation becomes complex with control issues
Solution Approach 1:
The invention extracts the flexible sheet and adhesive components from the system by directly extruding the paste through a nozzle. This eliminates the complex sheet handling, adhesive control, and powder pile geometry control issues while maintaining ease of powder/ignition charge insertion into the combustible tube
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
Facilitates safe and precise deposition of ignition charges with reduced pyrotechnic risks, enabling the creation of complex patterns within combustible tubes, improving handling and dismantling processes while minimizing exposure to hazardous materials.
Implementation Method 1
a second mechanical assembly B for extrusion... The cartridge is prolonged at one of its ends by a bent tubular extension provided with an extrusion nozzle
Data Source
AI summary
A device for depositing paste patterns on the surface of the channel of a tube, the device comprising a frame supporting a first mechanical assembly for holding, positioning and moving the tube, and a second mechanical assembly for extruding paste for depositing said paste patterns, the assemblies cooperating with one another.