Tapered Welding Wire Drum for Stackable Moisture-Resistant Storage
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Solution Overview
Problem
Conventional drums for welding wire coils have a low weight-to-volume ratio, leading to high transport costs, complex storage, and are not resistant to water or humidity, making them non-reusable and non-airtight, which complicates handling and storage.
Innovation Solution
A tapered-shaped drum with a plastic shell, made by injection molding, featuring a centering element and a filling element to maintain a constant internal diameter, allowing for efficient stacking and stable wire unwinding, and equipped with lifting straps and eyelets for secure handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional cylindrical drums are used for packaging welding wire coils, then the coils can be contained and transported, but the weight-to-volume ratio is low leading to high transport costs and complex storage
Solution Approach 1:
The patent employs nesting by designing the drum with an inner conical container that fits within an outer cylindrical shell. The conical container can be removed and nested within another drum when not in use, allowing multiple containers to be stored in a compact manner. This nesting approach reduces the effective transport volume while maintaining the protective function of the drum structure.
Solution Approach 2:
The drum is segmented into distinct functional components: an outer cylindrical shell for structural support and protection, an inner conical container for coil accommodation, a removable lid for access, and a filling element for stabilization. This segmentation allows each component to be optimized independently and facilitates easy assembly, disassembly, and nesting of multiple units.
2Strength
If conventional cardboard drums are used, then the drums are simple to manufacture, but they are not resistant to water and humidity and are not airtight
Solution Approach 1:
The drum employs a composite structure combining an outer cylindrical shell made of robust material (metal or heavy-duty plastic) for mechanical strength and environmental resistance, with an inner conical container that can be made of different materials optimized for coil protection. This composite approach provides both the required strength against water and humidity while maintaining manufacturing feasibility through modular construction.
Solution Approach 2:
The inner conical container is designed as a flexible or semi-rigid shell that can be made from materials resistant to moisture and humidity. This inner shell provides a protective barrier against environmental factors while allowing for cost-effective manufacturing through techniques like injection molding or forming from flexible materials.
3Strength
If conventional drums are used, then the structure is simple, but they are not very resistant mechanically and are hardly reusable
Solution Approach 1:
The drum is divided into reusable components: a durable outer shell that can be reused multiple times, removable inner containers that can be cleaned and reused, and standardized lids. This segmentation allows the structural components to be reused while facilitating easy maintenance and replacement of wear parts, thereby improving reusability without excessive complexity.
Solution Approach 2:
The use of composite materials with different properties for the outer shell and inner container allows each component to be optimized for its specific function. The outer shell uses materials optimized for mechanical strength and reusability, while the inner container uses materials optimized for protection and ease of cleaning, enabling the entire system to be reused multiple times.
4Volume of moving object
If a tapered container is used to improve stacking, then the transport volume is utilized better, but the coil stability decreases and wire may unwind with spires getting stuck or twisted
Solution Approach 1:
The inner conical container is nested within the outer cylindrical shell, creating a composite structure that combines the stacking efficiency of a tapered shape with the coil-stabilizing properties of a cylindrical outer form. The conical inner container maintains good stacking characteristics while the cylindrical outer shell provides a stable environment for the coil.
Solution Approach 2:
The drum structure applies different geometric qualities to different regions: the inner container has a conical shape optimized for stacking efficiency, while the outer shell maintains a cylindrical shape optimized for coil stability. The filling element introduces additional local structure to stabilize the coil in the tapered region where the container diameter varies.
5Shape
If the internal diameter of the container decreases from top to base to maintain tapered shape, then stacking is improved, but the residual space between coil and container walls varies causing unwinding problems
Solution Approach 1:
The nested structure of an inner conical container within an outer cylindrical shell allows the tapered shape to be maintained for stacking while the annular space between the two containers provides a consistent residual space for stable wire unwinding.
Solution Approach 2:
The filling element introduces localized structural features within the tapered container to maintain a consistent residual space between the coil and the container walls. This local modification ensures stable wire unwinding while preserving the overall tapered shape for efficient stacking.
Data Source
AI summary
A drum is described for containing a coil of welding wire, comprising a container having a bottom and side walls for delimiting a cavity in which the coil can be housed, and a lid to close the container,To improve the storage the container is a frustoconical shell and the base of the container corresponds to the bottom of the container.