Roller Mill Bearing Block Compensation for Skewed Roller Alignment
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Solution Overview
Problem
Roll crushing mills with counter-driven grinding rollers experience misalignment and distortion due to skewed axes, leading to bearing housing distortion and high restoring forces, which can cause system failure and damage to non-adjustable bearings.
Innovation Solution
The implementation of resilient compensation elements, arranged tangentially or in a circular arc around the vertical bearing axis, to absorb skewed positions and deflections of the grinding rollers, reducing loads on non-self-aligning bearings and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-self-aligning bearings are used to support the grinding rollers, then the bearing structure is simple and reliable, but the bearing housings become distorted due to skewed positions of the axis of rotation
Solution Approach 1:
The patent introduces bearing blocks as intermediary elements between the grinding rollers and the machine frame. These bearing blocks are horizontally slidable and rotatably guided about a vertical bearing axis, serving as a mediator that absorbs the skewed positions of the roller axes and prevents direct transmission of distortion to the bearing housings.
Solution Approach 2:
The patent changes the orientation parameter of the bearing support system by introducing a vertical bearing axis that is perpendicular to the grinding roller axes. This parameter change allows the bearing blocks to rotate and slide, accommodating the skewed positions of the rollers without distorting the bearing housings.
2Reliability
If a flat rubber body is used to transmit force and compensate skewed positions, then the skewed positions are absorbed, but the sealing is subject to wear and tear leading to system failure
Solution Approach 1:
The patent replaces the rubber body compensation mechanism with a mechanical bearing block system that is horizontally slidable and rotatably guided. This substitution eliminates the sealing wear problem inherent in rubber bodies while maintaining the ability to compensate for skewed positions through the slidable and rotatable bearing blocks.
3Reliability
If a flat rubber body is used to transmit force, then skewed positions are compensated, but high restoring forces develop that can damage non-adjustable bearings
Solution Approach 1:
The bearing blocks serve as intermediaries that reduce the restoring forces transmitted to the bearings. By being horizontally slidable and rotatably guided, they provide a mechanical advantage that lowers the force magnitude compared to direct rubber body attachment.
Solution Approach 2:
The patent introduces dynamic movement capabilities to the bearing blocks, allowing them to slide horizontally and rotate about a vertical axis. This dynamic behavior enables the system to adapt to skewed positions with reduced restoring forces compared to static compensation mechanisms.
4Reliability
If the bearing blocks are made horizontally slidable and rotatably guided, then skewed positions are compensated with low restoring forces, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the bearing blocks: they simultaneously serve as support elements for the grinding rollers, compensation elements for skewed positions, and force transmission elements. This merging reduces the need for separate components and simplifies the overall device structure.
Solution Approach 2:
The bearing blocks are designed with multi-functionality, serving as both support structures and compensation mechanisms. By being both horizontally slidable and rotatably guided, they can handle multiple aspects of roller misalignment and deflection with a single component type.
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 use of resilient compensation elements with high compressive strength and low restoring torques extends the service life of the compensation elements and non-self-aligning bearings, ensuring reliable operation with reduced edge loads and increased mobility.
Implementation Method 1
at least two resilient compensation elements are associated with each bearing block in order to compensate a skewed position and/or deflection of the grinding roller
Data Source
AI summary
A roller mill for comminuting brittle grinding stock comprises at least one grinding roller constructed as a loose roller and rotatable about an axis and interacting with a counter-surface such that grinding stock is comminuted between the grinding roller and counter-surface. Horizontally slidable bearing blocks bear the grinding roller and are guided in a frame rotatably about a vertical bearing axis. A pressing device applies an adjustable grinding pressure to the grinding roller via the bearing blocks. At least two resilient compensation elements are associated with each bearing block in order to compensate a skewed position and/or deflection of the grinding roller. The compensation elements are arranged between the frame and the bearing blocks, and, in the plan view of the roller mill, are arranged tangentially to a circle around the vertical bearing axis or constructed in a circular arc around the vertical bearing axis.