Horizontal Grinder Tip Retention With Concealed Mating Profiles
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Solution Overview
Problem
Existing comminuting apparatus face challenges in efficiently replacing grinder tips due to significant impacts and resulting forces, leading to frequent replacement of strikers and fasteners, and direct contact with comminuting material degrades structural surfaces.
Innovation Solution
A comminuting striker assembly with concealed recessed and protruding profiles on the striker and retainer, joined by a single threaded fastener, ensures that the interface is not visible from the outside, minimizing direct contact with comminuting material and facilitating easier replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strikers are bolted directly to mounting projections on the rotor, then the striker can be securely retained during comminution, but the interface between striker and rotor is exposed to direct contact with comminuting material, causing degradation of structural surfaces and increasing maintenance requirements
Solution Approach 1:
A retainer plate is introduced as an intermediary component between the striker and the rotor mounting projection. The retainer plate's leading face with protruding profile mates with the striker's recessed profile, while its trailing face attaches to the rotor. This intermediary shields the striker-retainer interface from direct contact with comminuting material, preventing degradation of the striker's structural surfaces while maintaining secure retention during operation.
2Power
If strikers are subjected to significant impacts and forces during comminution, then effective wood reduction is achieved, but the threaded fasteners and nuts deteriorate frequently, necessitating replacement
Solution Approach 1:
The fastening system is segmented into multiple components: the rotor mounting projection, the retainer plate with trailing face, and the striker with recessed profile. This segmentation allows the retainer plate to absorb and distribute impact forces across its structure, protecting the threaded fastener from direct exposure to extreme comminution forces. The modular design enables easier replacement of individual components, reducing overall maintenance time.
3Ease of operation
If the interface between striker and retainer plate is exposed, then assembly can be easily inspected, but comminuting material directly contacts the interface, degrading structural surfaces and complicating replacement
Solution Approach 1:
The interface between the striker and retainer plate is moved from an externally visible position to a concealed internal position. The retainer plate's leading face with protruding profile inserts into the striker's recessed profile, creating a hidden interface that is not directly accessible to comminuting material. This dimensional repositioning protects the interface from material contact while the overall assembly remains inspectable through other means.
Data Source
AI summary
A comminuting striker assembly for mounting on a rotor of a comminuting apparatus includes a striker having first and second opposed faces. The first face defines at least one cutting edge, and the second face defines at least one concealed recessed profile. A striker retainer has a leading face for attachment to the striker with at least one concealed protruding profile configured to mate with the concealed recessed profile. A single threaded fastener joins the striker to the striker retainer. When assembled, the interface between the concealed recessed profile and protruding profile is not visible from more than one side of the assembly, preventing direct contact with material being comminuted. Various embodiments include bowtie-shaped, rounded rectangular, and circular array configurations of the concealed profiles that maximize surface contact area and force transmission between the striker and retainer.