Grinding Disc Gap Monitoring Using Vibration Spectrum Peaks

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Solution Overview

Problem

Existing grinding devices for processing fibrous fluids lack real-time monitoring of gap width between grinding discs, necessitating periodic recalibration due to wear of the discs, affecting the efficiency and processing efficiency during operation, and existing recalibration during operation, and existing methods for determining the minimum gap width are not effective in continuous operation.

Innovation Solution

A method and system for monitoring the gap width between grinding discs by analyzing the frequency spectrum of mechanical vibrations caused by their rotation, using a controller to determine the prevalence of vibration peaks, which indicates the gap width, allowing continuous monitoring and adjustment during operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If periodic recalibration is performed to maintain accurate gap width measurement, then measurement precision is improved, but productivity deteriorates due to operational interruptions

Engineering Contradiction:

Improvegap width measurement accuracyVSAvoidprocessing efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The vibration analysis system enables continuous monitoring of gap width during grinding operation without requiring periodic shutdowns for recalibration. The system continuously analyzes vibrations to detect disc contact and maintain accurate gap width measurement throughout the processing cycle, eliminating interruptions and maintaining both precision and productivity

Inventive Principle:

Principle #20Continuity of useful action

2Ease of operation

If traditional sound-based recalibration method is used to determine minimum gap width, then ease of operation is improved, but measurement precision deteriorates due to subjectivity and lack of real-time monitoring

Engineering Contradiction:

Improvegap width setting simplicityVSAvoidgap width measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system replaces the subjective auditory method with an automated vibration analysis system using sensors and signal processing. Vibration sensors mounted on the grinding device detect mechanical vibrations, and a controller analyzes the vibration spectrum to objectively determine when discs contact, providing precise and repeatable gap width measurement while maintaining ease of operation through automated control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If vibration analysis in time domain is used to detect disc contact, then ease of operation is improved, but measurement precision deteriorates due to inability to distinguish contact from normal vibration

Engineering Contradiction:

Improvevibration detection simplicityVSAvoidcontact detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system transforms the vibration signal from the time domain to the frequency domain using spectral analysis. By examining the frequency spectrum rather than just time-domain amplitude, the system can identify characteristic frequency patterns that specifically indicate disc contact, distinguishing them from normal grinding vibrations and achieving precise contact detection while maintaining operational simplicity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Enables continuous monitoring and adjustment of the gap width, improving processing efficiency by maintaining optimal disc separation, reducing the need for manual recalibration and enhancing operational stability.

Implementation Method 1

obtaining a frequency spectrum of mechanical vibrations in the grinding device caused by the rotating of the first disc relative to the second disc

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Data Source

PatentUS20260001080A1Gap width monitoring

Publication Date: 2026.01.01 BELLMER CELLWOOD AB

AI summary

The present disclosure relates to a method of monitoring a width (w) of a gap (1) between two grinding discs (2) in a grinding device (10) for processing a fibrous fluid (6). The method comprises rotating a first disc of the grinding discs relative to a second disc of the grinding discs, about a rotational axis of the first disc. The method also comprises obtaining a frequency spectrum of mechanical vibrations in the grinding device caused by the rotating of the first disc relative to the second disc. The method also comprises, within a predetermined frequency range of the obtained frequency spectrum, determining a prevalence of vibration peaks, said prevalence being an indication of the gap width.