Twin Roller Crusher Interlocking Teeth Pockets

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Solution Overview

Problem

Conventional dual-roller crushers require a second crusher for achieving final grain size due to limited size reduction capability with large crusher teeth, necessitating additional processing steps and increased costs.

Innovation Solution

Each crusher tooth on one roller is associated with a pocket on the other roller, allowing large teeth to engage without collision, enabling a smaller nip and increased size reduction in a single pass, with additional crushing projections for further size reduction without increasing roller spacing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If large crusher teeth are used on the roller surface, then the ability to reduce coarse supplied material is improved, but the final grain size after crushing becomes relatively large

Engineering Contradiction:

Improveability to reduce coarse supplied materialVSAvoidfinal grain size

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The roller surface is segmented into two functional zones: crusher teeth for coarse material reduction and smooth pockets for fine material crushing. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between handling coarse material and achieving fine grain size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the roller surface are given different qualities: the outer surface has large crusher teeth for coarse material, while the inner surface has smooth pockets for fine material. This local differentiation allows the same roller to handle both coarse reduction and fine sizing simultaneously.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If a second dual-roller crusher is added to achieve final grain size, then the grain size precision is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvefinal grain sizeVSAvoidnumber of crushers required

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The functions of two separate crushers (coarse reduction and fine sizing) are merged into a single dual-roller crusher by equipping each roller with both crusher teeth and smooth pockets. This eliminates the need for a second crusher while achieving the same final grain size precision.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Each roller in the dual-roller crusher is designed to perform multiple functions: the outer surface with crusher teeth handles coarse material reduction, while the inner smooth surface with pockets handles fine material sizing. This multi-functionality allows one crusher to replace what would traditionally require two separate units.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If the nip between rollers is reduced to achieve smaller grain size, then the final grain size is improved, but the ability to handle coarse supplied material deteriorates

Engineering Contradiction:

Improvefinal grain sizeVSAvoidability to handle coarse supplied material

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The solution moves from a single-dimensional nip width adjustment to a two-dimensional approach: maintaining a larger overall nip for coarse material intake while creating localized smaller crushing zones within the pockets for fine grain size. This dimensional transition allows simultaneous handling of both coarse and fine material requirements.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Achieves a significantly larger crushing ratio up to 1:20, eliminating the need for a second crusher, enhancing economic efficiency and machine utilization while reducing space requirements.

Implementation Method 1

crusher teeth being mounted on the outer surfaces of the rollers... the crusher tooth engages into the respective pocket... crushed by the crusher teeth

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS10065191B2Twin roller crusher

Publication Date: 2018.09.04 CRUSH SIZE TECH

AI summary

The invention relates to a dual-roller crusher (1) with rollers (2, 3) rotatably mounted in a crusher housing and are driven by a motor so as to counter-rotate synchronously about respective parallel center axes, crusher teeth (6, 7) being mounted on the outer surfaces of the rollers (2, 3), every crusher tooth (6, 7) of a roller (2, 3) of the pair of rollers being fittable into a respective pocket (8, 9) in the outer surface of the other roller (2, 3) of the pair of rollers such that, during rotation of the rollers (2, 3), each crusher tooth (6, 7) engages in the respective pocket (8, 9).