Firework Launching Pits with Annular Grooves for Stable Trajectory
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Solution Overview
Problem
Current combined fireworks formed by mold pressing suffer from uneven propellant distribution, inaccurate inner cylinder placement, and unstable priming structures, leading to reduced launch height, trajectory deviations, and crossfire issues during ignition.
Innovation Solution
The design incorporates launching pits with annular grooves for precise inner cylinder alignment and conical cavities for concentrated propellant placement, along with fireproof bosses and recessed countersinks to prevent crossfire by separating incoming and outgoing leads, enhancing the structural integrity and safety of the fireworks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If propellants are placed in tubular cavities with large bottom area, then the action area for ignition is increased, but the launching force is dispersed and launch height is reduced
Solution Approach 1:
The bottom of each tubular cavity is segmented into a launching pit with concentrated propellant placement surrounded by an annular groove, separating the ignition zone from the structural base. This segmentation concentrates the propellant in a specific pit area rather than dispersing it across the entire bottom surface, resolving the contradiction between having sufficient bottom area for structural integrity and concentrating force for effective launching.
2Ease of operation
If inner cylinders are placed without location restrictions, then placement flexibility is improved, but positioning accuracy and trajectory consistency deteriorate
Solution Approach 1:
The annular groove provides a localized restricted zone at the bottom of each tubular cavity where the inner cylinder must be positioned. This local quality constraint ensures that the lower part of each inner cylinder is precisely located within the annular groove, improving positioning accuracy and trajectory consistency while still allowing flexibility in the overall assembly process.
3Object-affected harmful factors
If cutting grooves are sealed with glues to prevent crossfire, then crossfire prevention is achieved, but structural stability and reliability deteriorate under vibration and high temperature
Solution Approach 1:
The harmful element (glue) that provides temporary crossfire prevention but compromises long-term reliability is extracted from the system. Instead of relying on glue-filled cutting grooves, the design uses a fireproof boss structure with recessed countersinks that physically separate and protect the priming holes, providing both crossfire prevention and structural stability without the weaknesses of adhesive bonding.
4Object-affected harmful factors
If priming holes are located in wiring grooves sealed with glue, then crossfire is prevented, but the sealing structure is unstable under vibration and high temperature conditions
Solution Approach 1:
The unstable glue sealing is extracted and replaced with a stable fireproof boss structure. The fireproof boss with recessed countersink provides a rigid, temperature-resistant framework that secures the priming holes and prevents crossfire through physical separation rather than adhesive bonding, resolving the instability issue under vibration and high temperature conditions.
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
This configuration ensures vertical and accurate launch of inner cylinders with improved launch height and safety, preventing crossfire and ensuring consistent firing performance by concentrating propellants and stabilizing the structural elements.
Implementation Method 1
the propellants within the above-mentioned tubular cavities are ignited through priming holes
Data Source
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AI summary
The present invention relates to a combined fireworks with launching pits and multi-channel fireproof structures comprising a body, several tubular cavities are uniformly arranged on the body with the upper ports thereof are open and the lower ports thereof are closed, inner cylinders of fireworks and propellants are arranged inside the tubular cavity, the bottom of each tubular cavity is provided with annular grooves and launching pits. The bottom surface of the body is provided with several fireproof bosses, the position of each fireproof boss corresponds to each tubular cavity in the body respectively, and recessed countersinks are arranged on the fireproof bosses, the priming holes are arranged within the recessed countersinks, one end opening of the priming hole is located on the bottom surface of the launching pit, and the other end opening of the priming hole is located in the recessed countersinks. The present invention solves the problem of directional instability and unfocused acting force of the inner cylinders of fireworks during launching. With multi-channel fireproof structures protruding from the bottom surface, this invention can also prevent crossfire during launching.