Roller Mill Synchronization Device for Misalignment
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Solution Overview
Problem
Roller mills experience uneven loading and misalignment of grinding rollers due to wear and varying material properties, leading to damage and uneven wear, particularly affecting edge elements.
Innovation Solution
A roller mill design featuring a synchronization device with hydraulically connected actuators that couple the movement of pistons and hydraulic cylinders, ensuring synchronized movement of the grinding rollers and preventing misalignment through a mechanical coupling and buffer units, which limit movement differences and apply forces to maintain roller alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If grinding rollers are operated with fixed mounting, then structural simplicity is maintained, but misalignment and uneven wear occur due to uneven loading
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed mounting system to a floating bearing unit that can dynamically adjust its position. The floating bearing unit moves in response to uneven loading conditions, allowing the grinding rollers to maintain proper alignment despite variations in material properties and wear. This dynamic adaptation prevents misalignment and edge element damage while maintaining operational simplicity.
2Manufacturing precision
If hydraulic actuators are used to adjust roller position, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple hydraulic actuators into a single integrated floating bearing unit. Instead of using separate adjustment mechanisms for each roller, the floating bearing unit combines the hydraulic actuation system to collectively manage the position and alignment of the grinding rollers. This merging approach achieves precise alignment control while reducing overall system complexity compared to multiple independent adjustment systems.
3Strength
If edge elements are rigidly mounted at roller ends, then structural strength is maintained, but damage occurs due to misalignment
Solution Approach 1:
The patent applies beforehand cushioning by designing the floating bearing unit to anticipate and compensate for misalignment forces before they reach the edge elements. The floating bearing unit absorbs and dampens the uneven loading and misalignment stresses through its movable design, preventing these forces from being transmitted to the rigidly mounted edge elements. This protective mechanism maintains both the structural strength and durability of the edge elements by eliminating the misalignment cause.
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 solution effectively prevents damage to the grinding rollers by maintaining their parallel alignment, reducing wear and extending the lifespan of edge elements by compensating for uneven loading and material variations during operation.
Implementation Method 1
there is attached to the floating bearing unit a plurality of hydraulic actuators for moving the floating bearing unit and/or applying a force, for example the grinding force, to the floating bearing unit
Implementation Method 2
The synchronization device has a plurality of hydraulic cylinders each having a piston, wherein the pistons are connected to one another via a mechanical coupling so that the movements of the pistons are coupled
Data Source
AI summary
A roller mill for comminution of bulk material may include a first grinding roller and a second grinding roller that are arranged opposite one another and are configured to be driven in opposite directions. The grinding rollers may be positioned with a grinding gap therebetween. A fixed bearing unit may be configured to hold the second grinding roller, and a floating bearing unit may be configured to hold the first grinding roller. Attached to the floating bearing unit are hydraulic actuators for applying a force to the floating bearing unit. The hydraulic actuators are hydraulically connected to a synchronization device. The synchronization device has a plurality of hydraulic cylinders, each having a piston. The pistons may be connected to one another via a mechanical coupling such that movements of the pistons are coupled.