Rotatable Multi-Head Scraper for Roller Crusher Maintenance
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Solution Overview
Problem
Existing roller crushers with flanges face challenges in maintaining efficient operation due to excessive build-up material at the transition between the crusher roller surface and the flange, leading to increased maintenance time and wear.
Innovation Solution
A scraper device featuring a rotatable multi-head scraper unit with at least two scrapers arranged tangentially, a rotation actuator for selective scraper use, and a brake arrangement to prevent rotation during operation, allowing for reduced maintenance time and simplified scraper replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flanges are attached to the ends of crusher rollers to maintain material pressure and improve crushing efficiency, then productivity increases, but material builds up excessively at the transition between the roller surface and flange, leading to increased maintenance time and wear
Solution Approach 1:
The scraper unit is divided into multiple individual scrapers (at least two) arranged radially around the roller, allowing them to work simultaneously at different positions. This segmentation enables continuous operation while distributing the scraping function across multiple elements, reducing maintenance frequency compared to a single scraper.
Solution Approach 2:
The patent implements a replaceable scraper system where worn scrapers can be quickly replaced without replacing the entire scraper mechanism. The rotatable multi-head scraper unit allows individual scrapers to be discarded when worn and replaced with fresh ones, minimizing maintenance downtime while preserving the functional scraper structure.
2Device complexity
If a single scraper is used to remove build-up material, then the device structure remains simple, but maintenance time increases and scraper replacement becomes complex
Solution Approach 1:
The scraper unit is made rotatable, transforming it from a static single-scraper configuration to a dynamic multi-position system. The rotation actuator enables the scraper assembly to rotate to different angular positions, allowing multiple scrapers to engage the roller surface at different locations sequentially or simultaneously, increasing maintenance efficiency without proportionally increasing structural complexity.
Solution Approach 2:
The rotatable multi-head scraper unit serves multiple functions: it can position multiple scrapers at different angular locations around the roller, enable automated scraper replacement by rotating to a maintenance position, and provide adjustable scraping pressure through controlled rotation. This multi-functionality consolidates what would otherwise require separate mechanisms into a single universal device.
3Productivity
If scrapers are arranged to effectively remove build-up material, then operational efficiency improves, but scraper replacement becomes more complex and time-consuming
Solution Approach 1:
The system prepares for maintenance in advance by rotating the scraper unit to a predetermined maintenance position where worn scrapers can be accessed and replaced. The rotation actuator enables the scraper assembly to be positioned optimally before maintenance begins, and the brake arrangement ensures the scraper remains stationary during replacement, making the repair process simpler and faster.
Solution Approach 2:
The rotation actuator and brake arrangement serve as intermediary mechanisms that facilitate scraper replacement. The actuator mediates the positioning of scrapers to accessible locations, while the brake arrangement mediates the stationary condition during replacement operations, making the overall replacement process easier without compromising operational efficiency.
4Loss of time
If the scraper unit is made rotatable to enable scraper exchange, then maintenance time is reduced, but the device complexity increases
Solution Approach 1:
The patent combines multiple scrapers, the rotation mechanism, and the brake arrangement into a single integrated rotatable multi-head scraper unit. This merging consolidates what would otherwise be separate components into one unified device, reducing the number of independent mechanisms and simplifying the overall structure while maintaining the ability to rotate and replace scrapers efficiently.
Data Source
AI summary
A scraper device for a roller crusher, which scraper device includes a rotatable multi head scraper unit having at least two scrapers arranged tangentially about the rotatable multi head scraper unit at a respective radial distance from a rotational axis of the rotatable multi head scraper unit. The scraper device further includes a rotation actuator arranged to selectively rotate the rotatable multi head scraper unit to allow operative use of one of the at least two scrapers at a time. The scraper device further includes at least one brake arrangement configured to prevent and/or restrict rotation of the rotatable multi head scraper unit during operation of the one of the at least two scrapers. A roller crusher including the scraper device and a method for operating the roller crusher is also provided.