Segmented Protective Cap for Shredder Rotor
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Solution Overview
Problem
Existing protective caps for shredding machines' rotors are prone to premature failure due to manufacturing-induced stresses and segregation issues in steel sheets, leading to increased wear and maintenance costs.
Innovation Solution
A protective cap design featuring multiple flat surface sections made from plate-shaped wear elements, welded together to form a closed jacket with a striking edge, eliminating the need for bending and thus avoiding stress-related cracks, and allowing for cost-effective production and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If protective caps are made from bent steel sheets, then a continuous shell surface can be achieved, but manufacturing-induced stresses and segregation cause bending cracks leading to premature failure
Solution Approach 1:
The protective cap is divided into multiple flat surface sections (at least two) that are joined together to form the shell. Each section remains flat and free from bending stresses, eliminating the crack formation issue while still creating a continuous protective surface when assembled.
2Ease of manufacture
If steel sheets are bent to form protective caps, then a cylindrical shell can be created, but tensile and compressive stresses during bending cause cracks in segregation areas
Solution Approach 1:
Instead of bending a continuous steel sheet, the cap is segmented into multiple flat sections that are joined together. This eliminates the bending process entirely, avoiding the tensile and compressive stresses that cause cracks in segregation areas.
Solution Approach 2:
The protective cap is constructed as a composite structure with at least two different materials: a base material (structural steel) and a wear-resistant material (hardened steel or coating). This combination provides both structural integrity and wear protection without the cracking issues of bent single-material sheets.
3Reliability
If the entire protective cap surface is hardened, then wear resistance is maximized, but toughness is reduced increasing fracture risk in non-wear areas
Solution Approach 1:
Different regions of the protective cap have different material properties: the surface sections exposed to wear are made from hardened wear-resistant material, while the hub and other non-wear areas use tougher structural steel. This local differentiation optimizes both wear resistance and fracture resistance where needed.
Solution Approach 2:
The protective cap uses composite construction with at least two materials having different properties: a wear-resistant material for the shell surface and a tougher base material for structural components. This allows optimization of each region for its specific function.
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 significantly extends the service life of protective caps by preventing crack formation and reducing production costs, while the striking edge design enhances material distribution and shredding efficiency by preventing feed material concentration on the rotor surface.
Implementation Method 1
the wear elements are directly welded to one another
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a protective cap (15) for a rotor of a shredding machine and to a rotor (10), wherein the rotor is formed from a rotor shaft (11) with support discs (12) arranged at axial intervals along the rotor shaft and impact tools (14) rotatably mounted between the support discs of the rotor, wherein the protective cap is designed such that the protective cap can be attached to or between the support discs, and a cylindrical shell (16) of the rotor with openings (17) for the impact tools can be formed from a plurality of protective caps arranged radially on or between the support discs, wherein the protective cap forms a partial shell surface (24) of a shell surface (23) of the shell, wherein the partial shell surface of the protective cap is formed from at least two flat surface sections (25).