Comminution Tool Segmented Contact Surface

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Solution Overview

Problem

Existing comminution devices face issues with tool wear and foreign object loading, leading to increased stress and potential connection failure between the tool body and exchangeable cutting edge parts due to unfavorable geometric integration, necessitating frequent replacement of entire tools.

Innovation Solution

A tool design featuring a tool body and exchangeable cutting edge part with complementary elevations and depressions on their contact surface, providing a stable thread-like connection that distributes stress evenly and prevents upward disengagement under radial forces, allowing for cost-effective and frequent replacement of only the cutting edge part.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the tool cutting edge part is connected to the tool body via screws with unfavorable geometric integration, then the tool can be assembled, but the connection fails under high local stresses and radial forces

Engineering Contradiction:

Improveconnection strengthVSAvoidconnection reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The contact surface is segmented into multiple elevations and depressions that distribute the connection area, preventing high local stresses at single points. This segmentation allows the connection to handle radial forces and stress loads more reliably while maintaining assembly feasibility.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the entire tool is replaced due to tool wear, then worn tools are replaced, but replacement frequency increases and costs rise

Engineering Contradiction:

Improvetool reliabilityVSAvoidreplacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The tool is segmented into a reusable tool body and replaceable cutting edge parts. When cutting edges wear, only these specific parts need replacement while the tool body remains in service, significantly reducing replacement frequency and associated time losses.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting edge parts are designed as consumable components that can be discarded after wear, while the valuable tool body is recovered and reused. This selective replacement strategy extends overall tool life and reduces waste.

Inventive Principle:

Principle #34Discarding and recovering

3Ease of manufacture

If the contact surface has simple flat geometry, then manufacturing is easy, but the connection area is small and stress distribution is poor

Engineering Contradiction:

Improvecontact surface manufacturingVSAvoidconnection strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The contact surface features curved elevations and depressions rather than simple flat geometry. This curvature increases the effective contact area and improves stress distribution while remaining manufacturable through standard forming processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP2548649B1Tool for a reduction device

Publication Date: 2019.04.10 KOMPTECH

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AI summary

The tool (22) has a contact surface (30) comprising complementary ridges (32) and recesses (34) between a tool base body (26) and a tool cutting part (28). The ridges of the tool base body are engaged in the recesses of the cutting part. Inclined surfaces starting from the ridges run to the recesses, and the ridges and the recesses run parallel to each other. The cutting part is detachably connected with the base body by mounting screws (42). The base body is formed as a counter cutting tool and inserted into a counter cutting tool carrier of a comminution apparatus. An independent claim is also included for a comminution apparatus comprising a comminution roller.