Hammer Mill Bushing and Spacer System for Rod Wear Protection
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Solution Overview
Problem
Hammer mills experience wear and damage due to contact between hammers and rods, leading to elongation of hammer apertures and groove formation on rods, potentially causing hammers to collide with the enclosure, resulting in damage.
Innovation Solution
A bushing system comprising a rod with first and second bushings, where the second bushing has a spacer portion and a neck portion with a larger cross-section, allowing hammers to be mounted on the neck portion and preventing direct contact between hammers and rods, thereby reducing wear and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hammers are mounted directly on rods, then the structure is simple and easy to manufacture, but wear and damage occur at contact points causing hammer aperture elongation and rod groove formation
Solution Approach 1:
The patent introduces bushings as intermediary components between the hammers and rods. These bushings serve as mediators that prevent direct metal-to-metal contact, thereby eliminating the wear and damage problems while maintaining manufacturing simplicity. The bushings are installed on the rods and provide a protective interface for the hammers.
Solution Approach 2:
The patent extracts the harmful contact interface by removing the direct connection between hammers and rods. By taking out the direct contact relationship and replacing it with bushings, the invention eliminates the source of wear and damage while preserving the functional connection between hammers and rods.
2Ease of operation
If hammers rotate freely on rods, then operation is simple, but hammers extend radially outwardly and collide with the enclosure causing damage
Solution Approach 1:
The bushings act as intermediaries that control the rotational movement of hammers while preventing excessive radial extension. The bushings provide a constrained interface that allows necessary rotation for operation while limiting the harmful radial movement that causes enclosure collisions.
Solution Approach 2:
The patent segments the connection between hammers and rods by introducing bushings as separate components. This segmentation allows independent optimization of rotational freedom for operation and radial constraint for damage prevention, resolving the contradiction between ease of operation and prevention of harmful effects.
3Device complexity
If rods are exposed to hammer contact, then the structure is simple, but grooves form on rods and hammers extend radially causing potential enclosure contact
Solution Approach 1:
The bushings serve as protective intermediaries that shield the rods from direct hammer contact. This prevents groove formation on rods and controls hammer radial extension, thereby improving reliability without significantly increasing device complexity. The bushings are simple cylindrical components that provide effective protection.
Data Source
AI summary
A bushing and spacer system for use with hammer mills is configured to be mounted on a hammer mill rod to receive and support a plurality of hammers such that the surface of the rod is shielded from contact with the hammers, and such that the hammers are positioned in spaced relationship one with another. The bushing and spacer system includes at least a first bushing and a second bushing mounted on the hammer rod. The second bushing includes a spacer portion and a neck portion, the spacer portion presenting a larger cross section than the neck portion. The second bushing is mounted on the rod such that the neck portion of the second bushing is adjacent the first bushing. A hammer is rotatably mounted on the neck portion of the second bushing.