Spur Wheel Scraper for Roller Crusher Build-Up Removal

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Solution Overview

Problem

Conventional roller crushers face issues with material build-up leading to excessive wear, local stress, and skewing due to rigid scrapers, which are inefficient and user-unfriendly, particularly when material build-up occurs between grinding rolls and flanges.

Innovation Solution

A roller crusher equipped with a device comprising rotatable disc elements with circumferential protrusions, such as spurs, that loosen material build-up on the crushing surface and between the surface and flanges, reducing wear and stress by allowing for flexible and efficient removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rigid scrapers are used to remove material build-up, then material removal is achieved, but excessive shear stresses occur during operation

Engineering Contradiction:

Improvematerial build-up removalVSAvoidshear stress on scraper

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent replaces rigid scrapers with flexible elements that can dynamically adapt to the crushing surface and material build-up conditions. The flexible elements can deflect and rotate, transforming the static rigid structure into a dynamic system that reduces stress concentration while maintaining material removal capability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the physical parameters of the material removal device by using flexible elements with specific elasticity and rotational freedom. This allows the device to change its contact angle and pressure distribution, reducing shear stresses while effectively removing material build-up from the crushing surface.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If scrapers are installed inclined towards the crushing surface, then material build-up can be reached, but the scraper is exposed to excessive shear stresses

Engineering Contradiction:

Improveaccess to material build-upVSAvoidshear stress on scraper

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The flexible elements are free to rotate and deflect, allowing them to dynamically adjust their orientation relative to the crushing surface. This rotational freedom enables the elements to reach material build-up in inclined areas while reducing the shear stress component by aligning more favorably with the material removal direction.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If conventional rigid scrapers are used, then structure is simple, but the device is not flexible and user-unfriendly

Engineering Contradiction:

Improvescraper structureVSAvoiddevice flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent introduces flexible elements with variable geometric parameters that can adapt to different material build-up conditions and crushing surface configurations. This provides versatility and user-friendliness while maintaining reasonable structural complexity through the use of standardized flexible component designs.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12508597B2Spur wheel scraper

Publication Date: 2025.12.30 METSO OUTOTEC USA INC

AI summary

The disclosure relates to a roller crusher including a first grinding roll and a second grinding roll, the first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner. The roller crusher includes a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device including at least one rotatable disc element. The subject further relates to a roller crusher, wherein the plurality of disc elements is individually rotatable.