Multi-Roller Bearing Preload Layout for Stable Nip Force

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Solution Overview

Problem

Conventional roller mills are not suitable for processing materials with varying material properties during continuous production, as they fail to maintain consistent rolling forces, leading to nip collapse and uneven material thickness due to different density distributions.

Innovation Solution

A roller arrangement with axially parallel rollers, where compressive and tensile stresses are strategically applied between bearings to ensure consistent force guidance, allowing for adjustable clearance and improved infeed, using a pressure-controlled actuator system to manage stress states across multiple rollers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional bearings are used in roller mills, then the structure is simple and easy to manufacture, but the bearing clearance causes nip collapse and uneven material thickness when processing materials with varying density

Engineering Contradiction:

Improvematerial thickness consistencyVSAvoidbearing arrangement complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The bearing support system is segmented into multiple bearing units (first bearing unit, second bearing unit, third bearing unit) arranged in series along the roller journal. Each bearing unit independently supports specific portions of the roller, allowing precise control over clearance and force distribution in different zones of the roller journal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different bearing units are assigned different functions: the first bearing unit provides primary support, the second bearing unit compensates for clearance in specific directions, and the third bearing unit maintains positional accuracy. This local differentiation of bearing functions optimizes performance for handling materials with varying density distributions.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If bearing clearance is reduced to maintain consistent rolling forces, then material thickness uniformity improves, but the bearing becomes more sensitive to load variations and requires more precise positioning

Engineering Contradiction:

Improvematerial thickness uniformityVSAvoidbearing performance under load variation

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The bearing arrangement is pre-configured with specific clearances and preloads to anticipate and compensate for load variations during operation. The series arrangement of bearing units creates a cushioning effect that absorbs sudden load changes and maintains consistent rolling forces even when processing materials with inhomogeneous density.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The bearing system is designed to dynamically adapt to load variations through the interaction of multiple bearing units in series. Each bearing unit can independently adjust its load distribution, allowing the system to maintain optimal performance across varying operating conditions and material properties.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If multiple bearings are arranged in series with crosswise tensioning, then force guidance nesting is achieved and bearing clearance is controlled, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvebearing clearance controlVSAvoidbearing assembly complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The bearing units are pre-assembled and pre-adjusted to achieve the correct force guidance nesting and clearance specifications before final installation. This preliminary preparation simplifies the overall assembly process and ensures that the complex bearing arrangement is installed in the correct configuration, reducing manufacturing difficulty.

Inventive Principle:

Principle #10Preliminary action

4Manufacturing precision

If the bearing arrangement is optimized for consistent force guidance, then processing quality improves, but the adaptability to different material properties decreases

Engineering Contradiction:

Improveprocessing qualityVSAvoidadaptability to varying material density

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The bearing system incorporates dynamic adjustment capabilities that allow the clearances and preloads of individual bearing units to be modified based on material properties. This enables the same bearing arrangement to maintain optimal performance across different material types and density distributions, enhancing adaptability while preserving processing quality.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11821460B2Roller arrangement

Publication Date: 2023.11.21 MATTHEWS INTERNATIONAL CORP

AI summary

A roller arrangement includes at least three parallel-axis rollers with a respective nip formed between adjacent rollers. Each of the rollers having a journal at both axial ends and is pivot-mounted via the respective roller journals. At least two bearings being arranged axially adjacent to one another at least on both of a first roller journal of a first, second and third adjacent rollers. A compressive stress is generated between an inner bearing on the first roller journal of the first roller and an outer bearing on the first roller journal of the second roller and a tensile stress is generated between an outer bearing on the first roller journal of the first roller and an inner bearing on the first roller journal of the second roller or vice versa. Similarly, compressive and tensile stresses are generated between the bearings on respective journals of the second and third adjacent rollers.