Variable-Tooth Agricultural Blades for Universal Cutting
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Solution Overview
Problem
Existing agricultural machinery knives require multiple blades with different tooth configurations for various cutting tasks, leading to increased production, assembly, and storage efforts, as well as a risk of clamping and breakage due to uniform or bi-level tooth designs.
Innovation Solution
The cutting edges of the knives are varied in tooth pitch and geometry along their length, allowing for a universal cutting behavior that can handle different cutting materials without blade changes, achieved through techniques like embossing or milling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple blades with different tooth configurations are used for various cutting tasks, then cutting performance for different materials is improved, but production, assembly, and storage efforts increase
Solution Approach 1:
The patent applies universality by designing a single knife blade that can handle multiple cutting tasks through varied tooth pitch and geometry along its length. The blade features a first section with first tooth pitch/geometry for coarse materials and a second section with second tooth pitch/geometry for fine materials, eliminating the need for multiple specialized blades while maintaining adaptability to different cutting requirements
Solution Approach 2:
The patent applies segmentation by dividing the continuous cutting edge into distinct sections, each with different tooth characteristics. The knife blade is segmented into a first section and a second section along the cutting direction, with each section optimized for specific material types, allowing one blade to perform functions previously requiring multiple blades
2Ease of manufacture
If uniform tooth configuration is used along the cutting edge, then manufacturing is simplified, but clamping and breakage risk increases for diverse materials
Solution Approach 1:
The patent applies local quality by varying the tooth pitch and geometry at different locations along the cutting edge rather than using a uniform configuration. The first section has coarser tooth characteristics suitable for rigid materials, while the second section has finer tooth characteristics for flexible materials, optimizing performance and reducing breakage risk for each material type without complicating manufacturing
3Adaptability or versatility
If bi-level tooth design is used to reduce clamping, then versatility is improved, but risk of breakage increases due to construction changes
Solution Approach 1:
The patent applies dynamics by implementing a gradual transition zone between the first and second sections with varying tooth pitch and geometry. This dynamic transition allows progressive adaptation from coarse to fine tooth characteristics, reducing sudden stress concentrations and construction changes that could lead to blade breakage while maintaining versatility for different materials
Data Source
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AI summary
Knife and blade for agricultural machinery, in particular mower blade, straw chopper blade, corn header blade, feed mixer wagon blade, loader wagon and baler blade, which has at least one toothed cutting edge (3) extending from a cutting edge beginning (5) to the cutting edge end (6) on a blade sheet (1), wherein the cutting edge (3) is straight or curved, and wherein the blade sheet (1) has a fastening section (2), characterized in that the toothing of the cutting edge (3) is varied over its length with regard to the tooth pitch and/or tooth geometry.