Roller Press Roll Flow Restricting Means

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Solution Overview

Problem

The autogenous layer of granular material flowing between wear-resistant surface studs on roller press rolls causes excessive wear and disrupts comminution by interparticle crushing, limiting the lifespan of the rolls and the comminution process.

Innovation Solution

The rolls are equipped with flow restricting means, such as strip-like elements positioned in longitudinal or inclined orientations, to prevent the autogenous layer from flowing between the wear-resistant surface studs, thereby reducing wear and maintaining effective comminution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wear-resistant surface studs are provided on the roller surface to improve draw-in capability and protect the base material, then the draw-in capability and protection are improved, but the autogenous layer flows between the studs causing excessive wear and disrupting comminution

Engineering Contradiction:

Improvedraw-in capability and protection of base materialVSAvoidexcessive wear and disruption of comminution

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The roller surface is segmented into multiple functional zones: wear-resistant studs for draw-in capability, flow restricting means to prevent autogenous layer flow, and cladding layers for protection. This segmentation allows each element to perform its specific function without interfering with others, resolving the contradiction between protection and harmful flow effects

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Flow restricting means act as intermediary elements between the wear-resistant studs and the autogenous layer. These intermediaries prevent the harmful flow of granular material between studs while maintaining the protective function of the autogenous layer, thus eliminating the excessive wear problem without sacrificing draw-in capability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the autogenous layer is allowed to form between surface studs to protect the roll surface, then protection is provided, but the layer fluidizes and causes excessive wear instead of protection

Engineering Contradiction:

Improveprotection of roll surfaceVSAvoidexcessive wear to base material

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Flow restricting means are pre-installed on the roller surface to prevent the harmful fluidization of the autogenous layer before it can occur. By anticipating and preventing the flow condition, the protective function of the autogenous layer is maintained while avoiding the harmful effects of fluidization and excessive wear

Inventive Principle:

Principle #9Preliminary anti-action

3Productivity

If surface studs are used to improve draw-in capability, then material capture is improved, but the autogenous layer flow limits the lifespan of the roll

Engineering Contradiction:

Improvedraw-in capability and material captureVSAvoidlifespan of the roll

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The roller surface structure is segmented into functional zones with wear-resistant studs for draw-in capability and flow restricting means for lifespan extension. This segmentation allows simultaneous optimization of productivity through effective material capture and durability through prevention of excessive wear

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The surface geometry parameters are changed by adding flow restricting means with specific dimensions and orientations. These parameter changes prevent autogenous layer flow while maintaining the draw-in capability provided by the surface studs, thus extending roll lifespan without sacrificing productivity

Inventive Principle:

Principle #35Parameter changes

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

The flow restricting means significantly reduce or prevent excessive wear on the roll surfaces and ensure uninterrupted comminution of granular material by preventing the autogenous layer from fluidizing, thereby extending the lifespan of the rolls and maintaining process efficiency.

Implementation Method 1

Granular material is fed into the nip between two opposing rotatable rollers, which are rotating in opposite directions. Under friction the material is compressed between the roller surfaces with the application of an extremely high pressure.

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the comminution of the granular material by interparticle crushing in the nip between the opposing rolls

Methodology Applied

Scientific EffectInterparticle crushing: Impact Force

Data Source

PatentEP3749458B1A roll for a roller press, as well as a roller press provided with such a roll

Publication Date: 2023.11.15 WEIR MINERALS NETHERLANDS BV

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AI summary

The invention relates to a roll for a roller press suitable for comminution of granular material by interparticle crushing, as well as a roller press provided with such a roll. In certain applications and under specific operational conditions the autogenous layer starts to displace or flow between the outwardly extending wear-resistant surface studs. This flow of granular material has a low velocity relative to the roll and can cause excessive wear to the base material of the outer cylindrical pressing surface of the roll, instead of protecting it.