Twin-Shaft Shredder V-Shaped Blade Gap to Prevent Buildup
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Solution Overview
Problem
Conventional shredders face issues with material accumulation between the outermost blade and the housing, leading to friction, heat buildup, and potential fire hazards, as well as inefficiencies in material flow and maintenance requirements.
Innovation Solution
A shredder design featuring two parallel rotating shafts with overlapping and offset transverse shredding blades, where the outermost blade forms a V-shaped gap with the housing, facilitated by a flange or end-plate configuration, to enhance material flow and prevent accumulation, and a robust connection to withstand high torque and stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional transverse cutting blades are used with a flat gap between the outermost blade and housing, then the shredder structure is simple and easy to manufacture, but material accumulates in the gap causing friction, heat buildup, and fire hazards
Solution Approach 1:
The patent applies asymmetry by changing the gap geometry from a conventional flat rectangular shape to a V-shaped configuration. The V-shape is formed by the outermost blade having a tapered surface that meets the housing at an angle, creating a wedge-shaped gap. This asymmetric geometry prevents material from accumulating in the gap because material cannot settle horizontally in the inclined V-shaped space, thereby eliminating the fire hazard while maintaining manufacturing simplicity through standard blade design procedures
Solution Approach 2:
The patent utilizes curvature by implementing a tapered or curved surface on the outermost blade instead of a flat surface. The blade surface curves or tapers to form the V-shaped gap, creating a smooth transitional surface that guides material flow and prevents material from becoming trapped. This curved geometry ensures material continuously moves through the gap without accumulation, resolving the fire hazard issue while the blade can still be manufactured using conventional curving or tapering processes
2Productivity
If the outermost blade is designed with a V-shaped gap configuration, then material flow is improved and fire risks are reduced, but the blade and shaft connection must withstand higher torque and stresses
Solution Approach 1:
The patent applies merging by integrating the outermost blade with a flange structure that is directly connected to the shaft. The blade and flange are formed as a single integrated component or securely fastened together, creating a unified structure that can withstand the increased torque and stresses generated by the V-shaped gap configuration. This merged structure distributes the mechanical loads across both the blade and flange, preventing failure at the connection point while maintaining the productivity benefits of improved material flow
Solution Approach 2:
The patent applies segmentation by dividing the outermost blade assembly into distinct functional components: the V-shaped cutting blade portion and the flange portion for mechanical support and connection. This segmentation allows the blade to be optimized for cutting performance with the V-shaped gap while the flange is optimized for withstanding mechanical stresses. The modular design enables each component to be independently designed and manufactured to its optimal specifications, then assembled together to handle the combined requirements of productivity and strength
3Ease of manufacture
If conventional flat gap design is used, then manufacturing is simpler, but material builds up in the gap requiring frequent stoppage for clearing
Solution Approach 1:
The patent applies asymmetry by designing the gap with a V-shaped cross-section instead of a flat rectangular configuration. This asymmetric geometry creates a self-draining effect where shredded material naturally slides down the inclined surfaces of the V-shape toward the discharge point, preventing accumulation. The design eliminates the need for frequent stoppages to clear material buildup, as the geometry itself promotes continuous material flow and self-cleaning of the gap area
Solution Approach 2:
The patent utilizes curvature by implementing smoothly tapered surfaces in the V-shaped gap that guide material flow continuously. The curved or tapered geometry prevents sharp corners or flat surfaces where material could accumulate, ensuring that all material is directed toward the discharge opening. This curved design maintains manufacturing simplicity while eliminating downtime associated with material clearing operations
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 V-shaped gap design reduces fire risks, improves shredding efficiency, maintains consistent performance, and extends component lifespan by minimizing friction and wear, thereby reducing maintenance and operational costs while ensuring stable operation.
Implementation Method 1
friction of such moving material against the housing heats the material
Implementation Method 2
designed to rotate in contrary motion so as to produce a shear force thereinbetween, which force can shred or reduce or crush etc. the material
Implementation Method 3
friction of such moving material against the housing heats the material
Data Source
AI summary
A shredder for shredding material, the shredder comprising a housing supporting two rotating shafts arranged parallel to each other, each shaft having a plurality of overlapping and offset transverse shredding blades along the shafts able to rotate on the shafts in a complementary fashion to shred the material thereinbetween, the shredding blade on each shaft nearest to the housing being an outermost shredding blade and having a gap between of the outermost shredding blade and the housing, wherein the gap at least partly comprises a V-shape.