Rotatable PCD Scraper Unit for Roller Crusher Flange Build-Up
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Solution Overview
Problem
Existing roller crushers with flanges face issues with excessive build-up material in the transition between the crusher roller surface and the flange, requiring frequent maintenance and complex scraper replacement procedures.
Innovation Solution
A scraper device with a rotatable multi-head scraper unit featuring polycrystalline diamond (PCD) scraping surfaces and a brake arrangement, allowing for automated scraper exchange and reduced maintenance time, and enabling efficient removal of build-up material without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flanges are attached to roller ends to maintain crushing effect, then crushing uniformity is improved, but material build-up in transition zones increases requiring frequent maintenance
Solution Approach 1:
The scraper system is segmented into multiple independent scrapers (at least two) arranged radially around the roller, allowing individual replacement without shutting down the entire crusher. This segmentation enables maintenance of one scraper while others continue operating, reducing overall maintenance downtime.
Solution Approach 2:
Multiple scrapers are pre-installed on the roller in different radial positions. When one scraper wears or becomes clogged, the system can switch to another pre-positioned scraper without interruption to the crushing operation, performing maintenance preparation in advance.
2Ease of repair
If traditional scrapers are used to remove build-up material, then scraper replacement is simple, but maintenance time is excessive and operational efficiency decreases
Solution Approach 1:
The scraper system incorporates a rotation actuator that can dynamically rotate the scraper assembly to different angular positions around the roller. This allows the system to switch between multiple scrapers and adjust their positions without manual intervention, automating the maintenance process.
Solution Approach 2:
The system includes a rotation actuator and brake arrangement that enable automated scraper replacement and positioning. The brake arrangement automatically secures the scraper at desired positions, and the system can rotate to bring fresh scrapers into service without human operation, making the maintenance process self-service oriented.
3Device complexity
If manual scraper replacement is used, then device complexity is low, but productivity and operational efficiency are reduced
Solution Approach 1:
The manual mechanical scraper replacement process is replaced with an automated system incorporating a rotation actuator (electrical or hydraulic motor) and brake arrangement. This substitution of manual operations with automated mechanical systems dramatically reduces maintenance time and improves operational efficiency.
Solution Approach 2:
The system changes the operational parameter from static scraper positioning to dynamic rotation and positioning. By introducing rotational movement controlled by an actuator and secured by a brake, the system transforms the scraper from a fixed component to a dynamically repositionable one, enabling rapid replacement and adjustment.
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 prolongs scraper wear life by up to 50 times, reduces maintenance time, and facilitates easy scraper replacement, enhancing the operational efficiency and reliability 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)
Implementation Method 2
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
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 multi head scraper unit at a radial distance from a rotational axis. The scraper device further includes a rotation actuator to rotate the multi head scraper unit to allow use of one of scrapers at a time. The scraper device further 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 a 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.