Hollow-Cylindrical Knife Blade Asymmetric Fixation Wear Reduction
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Solution Overview
Problem
Existing blade and connection sleeve designs suffer from significant wear during operation, leading to reduced service life due to imbalance issues caused by fixation to the hollow shaft with three screws around the periphery.
Innovation Solution
The blade and connection sleeve design features a hollow-cylindrical blade with specific grinding angles and a connection sleeve with a cylindrical collar and offset thread, reducing imbalance and enhancing secure rotation, thereby extending the service life by improving cutting efficiency and material relaxation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the blade is fixed to the hollow shaft with three screws around the periphery, then the blade can be securely attached, but imbalance occurs during rotation leading to increased wear and reduced service life
Solution Approach 1:
The connection sleeve is designed with an asymmetric single-side fixation structure where the blade is attached to only one side of the hollow shaft using a single screw, rather than symmetric three-screw fixation. This asymmetric design eliminates the imbalance problem during rotation while maintaining secure attachment, thereby extending blade service life from approximately 1,500 cuts to 15,000 cuts
2Stability of the object's composition
If the blade is fixed with three screws around the periphery, then secure attachment is achieved, but rotation imbalance increases causing harmful vibrations
Solution Approach 1:
The connection sleeve employs asymmetric single-side fixation instead of symmetric three-screw attachment. The blade is secured to one side of the hollow shaft with a single screw, creating an asymmetric configuration that eliminates rotation imbalance and harmful vibrations while maintaining attachment stability
3Productivity
If the blade grinding angle is too sharp, then cutting efficiency improves, but blade wear increases reducing service life
Solution Approach 1:
The blade is ground with a specific angle parameter of 27 degrees at the cutting edge. This optimized angle parameter provides a balance between cutting efficiency and blade durability, preventing excessive wear while maintaining effective cutting performance throughout the extended service life
Data Source
AI summary
Blade for a knife of an apparatus for cutting off the rectum of slaughtered animals, wherein the ground section of the hollow cylindrical blade (11) is at a specific angle to the cutting edge (20) at the cutting edge of said hollow-cylindrical blade. The blade (11) is ground over a short portion (A) of its length with a first angle (α) and then in the axial direction on this portion with a second angle (β) which is smaller than the first-mentioned angle (α).