Grooved Hammer Mill Hammer for Hard Facing Retention

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Solution Overview

Problem

Existing hammer mill hammers face issues with hard facing separation during operation, leading to increased wear and potential loose particles in the comminuted material, which can result in inefficient grinding and higher power consumption.

Innovation Solution

A groove is formed in the edge of the grinding end of the hammer to securely receive and attach hard facing material, such as tungsten carbide, using a method that involves multiple thin layers of welding, enhancing the bond strength and retention of the hard facing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If hard facing is welded to the contact end of the hammer, then hammer life is increased, but the hard facing may separate from the hammer during operation

Engineering Contradiction:

Improvehammer lifeVSAvoidhard facing retention

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

A groove is formed in the contact end of the hammer before welding the hard facing material. This preliminary groove formation allows the hard facing to be securely received and bonded to the hammer surface, preventing separation during operation while maintaining extended hammer life.

Inventive Principle:

Principle #10Preliminary action

2Strength

If hard facing is added to the grinding end of the hammer, then wear resistance is improved, but the hammer size increases causing higher power consumption

Engineering Contradiction:

Improvewear resistanceVSAvoidpower consumption

Core Design Contradiction:

StrengthVSUse of energy by moving object

Solution Approach 1:

Hard facing material is applied only to specific areas of the hammer contact end where wear occurs, rather than covering the entire hammer surface. The groove confines the hard facing to the necessary contact zones, providing localized wear protection without significantly increasing the overall hammer size or power consumption.

Inventive Principle:

Principle #3Local quality

3Strength

If multiple thin layers of hard facing are welded, then bond strength is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improvebond strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The hard facing is applied in multiple thin layers rather than as a single thick layer. Each thin layer can be properly bonded to the hammer surface and to subsequent layers, creating a strong composite structure. The groove provides containment for these layers, ensuring proper positioning and bonding strength.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution improves the retention of hard facing on the hammer, reducing wear, minimizing power consumption, and enabling more efficient grinding with reduced risk of loose particles, while allowing for easier installation and removal of the hammer.

Implementation Method 1

A groove is formed in the edge of the grinding end of a hammer for receiving hard facing material and placing hard facing in the groove

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS11951485B2Method of making a hammer mill hammer with grooves for receiving hard facing material

Publication Date: 2024.04.09 CPM ACQUISITION CORP

AI summary

An improved hammer mill hammer constructed by forming a groove in an edge of the grinding end of a hammer for receiving hard facing material and placing hard facing in the groove.