Arrangement and method for adjusting blade gap in refiner

Patent metadata

Field	Value
Publication number	US-12091819-B2
Application number	US-202017115303-A
Country	US
Kind code	B2
Filing date	Dec 8, 2020
Priority date	Dec 17, 2019
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An arrangement and a method for adjusting a blade gap in a refiner. The arrangement comprises at least one loading device arrangeable to move at least one refining element of the refiner in respect of at least one another refining element of the refiner for adjusting the blade gap between the refining elements, at least one vibration measuring device for measuring a vibration of the refiner in operation, and at least one control unit configurable to adjust the blade gap between the refining elements by controlling the at least one loading device to move the at least one refining element in respect of the at least one another refining element based on the measured vibration of the refiner.

First claim

The invention claimed is:

1. A method for adjusting a blade gap in a refiner, the method comprising the steps of:
measuring a vibration of the refiner in operation to obtain a vibration measurement signal (VMS) describing the vibration of the refiner in operation,
comparing the vibration measurement signal (VMS) describing the vibration of the refiner in operation with a condition (SET-V) settable for the vibration of the refiner, the condition (SET-V) indicating the refining elements have touched,
moving at least one refining element towards at least one another refining element until the compared vibration measurement signal (VMS) and the condition (SET-V) indicate the refining elements touch to each other,
then moving the at least one refining element away from the at least one another refining element in accordance with a settable distance (SET-BW),
then periodically in accordance with a settable time interval (SET-T) after the at least one refining element has been moved away from the at least one another refining element, repeating the above steps of measuring, comparing, moving at least one refining element towards at least one another refining element, and then moving the at least one refining element away from the at least one another refining element, to provide a consistent settable distance between the refining elements.

2. The method as claimed in claim 1 , providing a position measurement signal (PMS) describing a position of the at least one refining element in respect of the at least one another refining element, and
controlling the position of the at least one refining element in respect of the at least one another refining element based on the position measurement signal (PMS).

Assignees

• Valmet Technologies Oy

Inventors

• Aronen Juha

Classifications

• B02C7/02

  with coaxial discs · CPC title

• B02C7/16

  Driving mechanisms · CPC title

• B02C7/14 Primary

  Adjusting, applying pressure to, or controlling distance between, discs · CPC title

• G01H1/00

  Measuring {characteristics of} vibrations in solids by using direct conduction to the detector (G01H9/00, G01H11/00 take precedence) · CPC title

• D21D1/24

  Jordan rolls · CPC title