Roller Grinding Mill Distributed Drive Radial Force Management
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Solution Overview
Problem
Modern roller mills face challenges with drive system maintenance, as issues in one component require complete drive removal, leading to long procurement times for replacement parts and inefficiencies in multi-motor drive concepts due to torque overshoots and reduced availability.
Innovation Solution
The roller mill design features a grinding table driven by multiple distributed drives around its circumference, with grinding rollers mounted on rocker arms for individual removal and adjustable angular positions to minimize radial forces, allowing for decoupling of drives and compensation by remaining rollers to maintain capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single drive is deactivated for maintenance, then maintenance availability is improved, but a large radial force component acts on the grinding table bearing
Solution Approach 1:
The invention makes the angular position of the drives adjustable around the center of the mill. When a drive is deactivated for maintenance, the angular position of the remaining active drives can be dynamically changed to optimize the force distribution. This dynamic adjustment allows the system to adapt to the reduced number of active drives, minimizing the radial force component on the bearing while maintaining maintenance availability.
Solution Approach 2:
The invention changes the operational parameters by allowing adjustment of the angular positions of the drives. By modifying the angular position parameter, the system can compensate for the deactivation of a single drive, ensuring that the resultant radial force on the bearing remains minimal even when maintenance is performed on one drive.
2Reliability
If multiple distributed drives are used around the grinding table, then maintenance availability and radial force minimization are improved, but device complexity increases
Solution Approach 1:
The invention divides the drive system into multiple independent drives distributed around the grinding table. Each drive can be independently deactivated and maintained without affecting the others, improving maintenance availability. The segmentation allows one drive to be taken offline while the others continue operation, reducing system downtime.
Solution Approach 2:
The adjustable angular position mechanism adds dynamic capability to the drive system. This allows the system to adapt its configuration based on operational needs, such as optimizing force distribution when drives are deactivated for maintenance. The dynamic adjustment capability resolves the complexity issue by providing flexibility that simplifies maintenance operations.
3Ease of repair
If grinding rollers are mounted on rocker arms for individual removal, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The invention segments the grinding roller mounting system by attaching each roller to an individual rocker arm. This segmentation allows each roller to be independently manipulated and removed without affecting other rollers. The modular rocker arm design simplifies repair operations by providing easy access to individual rollers while maintaining a relatively simple overall structure.
Solution Approach 2:
Instead of fixing the grinding rollers rigidly to the grinding table, the invention inverts the approach by mounting rollers on rocker arms that can swing outward. This inversion of the mounting concept allows rollers to be easily accessed and removed by swinging them outward on the rocker arms, significantly improving ease of repair with minimal structural complexity.
Data Source
Figure 1
Figure 2a~2d
Figure 3a~3d
AI summary
The invention relates to roller grinding mills comprising a grinding plate (1), grinding rollers (M), and at least two drives (A) acting upon the grinding plate (1), and to a method for operating such a roller grinding mill. At least one grinding roller and simultaneously at least one matching drive (A) can be disengaged during operation. Thus only small radial forces are created that effect the radial bearing of the grinding plate (1).