Hammer Mill Sleeve and Snap Ring Attachment Mechanism
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Solution Overview
Problem
Standard hammer mills experience premature failure of the pivotal connection between hammers and the mill due to high impact forces, leading to costly shutdowns for repair.
Innovation Solution
An improved apparatus featuring a sleeve with a shoulder and annular groove, combined with a snap ring and compression ring, securely attaches hammers to the mill, distributing forces more evenly and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard pivotal connection is used between hammers and hammer mill, then the hammer mill can operate, but the pivotal connection fails prematurely due to high impact forces
Solution Approach 1:
The pivotal connection is segmented into multiple components: a sleeve with first and second cylindrical outer surfaces, a shoulder, an annular groove, and a snap ring. This segmentation distributes the high impact forces across multiple elements rather than concentrating them on a single pivot point, thereby improving reliability and service life of the connection.
Solution Approach 2:
The snap ring is preliminarily positioned in the annular groove to pre-establish a secure retaining mechanism before operation begins. This preliminary action ensures that the hammer is firmly held between the shoulder and snap ring, preventing premature failure under impact loads.
2Reliability
If a secure attachment system is implemented to prevent premature failure, then reliability improves, but the device complexity increases
Solution Approach 1:
The attachment system uses a nested structure where the snap ring fits into the annular groove on the first cylindrical outer surface of the sleeve, and the hammer is nested between the shoulder and snap ring. This nesting approach achieves secure attachment while maintaining a compact and relatively simple overall structure.
Solution Approach 2:
The sleeve acts as an intermediary component between the hammer mill and the hammer. It provides the shoulder and annular groove structures that secure the hammer, thereby simplifying the overall attachment system while improving reliability compared to a direct pivotal connection.
3Strength
If the pivotal connection is strengthened to withstand high impact forces, then durability improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The sleeve is designed with different local qualities: the first cylindrical outer surface has a diameter only slightly smaller than the hammer opening for a tight fit, while the second cylindrical outer surface has a larger diameter to accommodate the snap ring. This local differentiation provides the necessary strength at critical locations while keeping manufacturing straightforward.
Solution Approach 2:
The attachment system allows for dynamic adjustment and assembly. The snap ring can be selectively disposed in the annular groove to secure the hammer, and the entire assembly can be easily disassembled for maintenance or replacement, thereby improving ease of manufacture and maintenance while maintaining high strength.
Data Source
AI summary
An apparatus for mounting hammers to a hammer mill having at least one hammer provided for attachment to a hammer mill, the at least one hammer having an opening disposed in one end thereof corresponding to a pivot axis, the opening being of a first diameter. A sleeve having a central opening therein is operatively attached to the hammer mill, the sleeve being disposed in the opening in the one end of the at least one hammer. The sleeve has a first cylindrical outer surface with a second diameter, the second diameter being only slightly smaller than the first diameter of the opening in one end of the at least one hammer. The sleeve has a second cylindrical outer surface with a third diameter, the third diameter being larger than said second diameter. A shoulder on the sleeve extends from the second cylindrical outer surface to the third cylindrical outer surface. An annular groove is disposed in the first cylindrical outer surface. A snap ring is selectively disposed in the annular groove, the snap ring having an outer diameter which is larger than the second diameter, whereby the at least one hammer will be disposed between the shoulder and the snap ring. A second embodiment uses a compression ring with a groove in it, instead of using a snap ring.