Rotatable PCD Scraper Unit for Roller Crusher Build-Up Removal
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Solution Overview
Problem
Existing roller crushers face challenges with excessive build-up material accumulation at the transition between the crusher roller surface and the flange, leading to wear and maintenance issues, and require a more efficient and simplified scraper replacement process.
Innovation Solution
A scraper device with a rotatable multi-head scraper unit featuring polycrystalline diamond (PCD) scraping surfaces and a rotation actuator, allowing for automated scraper exchange and adjustment, and a brake arrangement to prevent rotation during operation, reducing wear and maintenance time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flanges are attached to the ends of crusher rollers to maintain crushing effect, then crushing efficiency along the roller length is improved, but material build-up accumulates at the transition between roller surface and flange causing wear and maintenance issues
Solution Approach 1:
The scraper system is divided into multiple independent scrapers (at least two scrapers) that can be selectively positioned along the roller circumference. Each scraper can be independently activated or deactivated based on operational needs, allowing selective removal of build-up material from different locations without requiring complete system replacement
Solution Approach 2:
The scraper system incorporates a positioning mechanism that allows the scrapers to be selectively positioned at different angular locations around the roller. The scrapers can be moved between active scraping positions and retracted positions, enabling dynamic control of where scraping occurs along the roller-flange transition zone
2Device complexity
If traditional single scraper systems are used, then the structure is simple, but scraper replacement requires complete shutdown and extensive maintenance time
Solution Approach 1:
Multiple scrapers are pre-positioned on the scraper system carrier before operation begins. When one scraper becomes worn or damaged, the system can be quickly reconfigured by activating a different pre-positioned scraper without requiring complete scraper replacement, thereby reducing maintenance downtime
Solution Approach 2:
The system allows individual worn scrapers to be discarded or deactivated while other scrapers continue operation. The scraper carrier retains multiple scrapers, and worn ones are replaced individually or in small groups rather than requiring complete system replacement, reducing maintenance time and resource waste
3Duration of action of moving object
If polycrystalline diamond (PCD) scraping surfaces are used, then scraper life is significantly prolonged, but the device complexity and initial cost increase
Solution Approach 1:
PCD material is applied specifically to the scraping surfaces where wear occurs, rather than requiring the entire scraper structure to be made of high-performance material. This localized application of advanced material extends scraper life at the critical wear zone while keeping overall device complexity and cost manageable
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 scraper device significantly prolongs scraper life, reduces maintenance time, and enables efficient removal of build-up material with minimal downtime, enhancing the operational efficiency of roller crushers.
Implementation Method 1
Each of the at least two scrapers comprises a scraping element having a scraping surface which scraping surface comprises a polycrystalline diamond (PCD)
Data Source
AI summary
A scraper device for a roller crusher including a rotatable multi head scraper unit having at least two scrapers arranged tangentially about the scraper unit at a radial distance from a rotational axis. The scraper device includes a rotation actuator to rotate the multi head scraper unit to allow use of one of scrapers at a time. The scraper device includes at least one brake arrangement to prevent and/or restrict rotation of the multi head scraper unit during operation of the one of the scrapers. Each of the scrapers includes a scraping element having a scraping surface formed from polycrystalline diamond (PCD). Each scraping surface at least partly faces in a tangential direction defined at the scraper surface and directed along a reference rotational direction of the rotatable multi head scraper unit. A roller crusher including the scraper device and a method for operating the roller crusher is also provided.