Vibration measuring assembly

Patent metadata

Field	Value
Publication number	US-12440850-B2
Application number	US-202318115403-A
Country	US
Kind code	B2
Filing date	Feb 28, 2023
Priority date	Aug 28, 2020
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A device for treating a web of fibrous material, the device comprising: a sensor for detecting vibrations; a multi-part housing including a cover; and a plurality of fiber treatment tools arranged inside the multi-part housing, the plurality of fiber treatment tools including a plurality of treatment profiles facing one another, being arranged spaced apart from each other so as to form at least one treatment gap with the plurality of treatment profiles, and being mounted rotatably relative to one another, at least one of the plurality of fiber treatment tools being mounted axially movable in the multi-part housing so as to be configured for adjusting a width of the at least one treatment gap between the plurality of treatment profiles facing each other, at least one of the plurality of fiber treatment tools being supported by a part of the multi-part housing, the sensor being arranged on the multi-part housing.

First claim

What is claimed is:

1. A device for treating a web of fibrous material, the device comprising:
a sensor for detecting a plurality of vibrations;
a multi-part housing including a cover;
a plurality of fiber treatment tools arranged inside the multi-part housing, the plurality of fiber treatment tools including a plurality of treatment profiles facing one another, being arranged spaced apart from each other so as to form at least one treatment gap with the plurality of treatment profiles, and being mounted rotatably relative to one another, at least one of the plurality of fiber treatment tools being mounted axially movable in the multi-part housing so as to be configured for adjusting a width of the at least one treatment gap between the plurality of treatment profiles facing each other, at least one of the plurality of fiber treatment tools being supported by a part of the multi-part housing, the sensor being arranged on the multi-part housing; and
a control unit including an evaluation device configured for detecting a malfunction when a predetermined number of time intervals of a predetermined duration which are impacted by the plurality of vibrations are exceeded, wherein at least half of the predetermined number of time intervals are impacted by the plurality of vibrations.

2. The device according to claim 1 , wherein the multi-part housing includes an outside, the sensor being arranged on the outside of the multi-part housing.

3. The device according to claim 1 , wherein the sensor for detecting the plurality of vibrations is formed by a uniaxial acceleration recorder.

4. The device according to claim 3 , wherein the sensor formed as the uniaxial acceleration recorder is aligned for detecting in a direction of the width of the at least one treatment gap.

5. The device according to claim 1 , further comprising at least two hinges, wherein the cover is rotatably mounted about a joint axis by way of the at least two hinges, the sensor being arranged in a region of the device between the at least two hinges on the multi-part housing, the region between the at least two hinges being limited by planes extending perpendicular relative to the joint axis.

6. The device according to claim 5 , wherein the sensor is arranged in the region of the device between the at least two hinges on the cover.

7. The device according to claim 5 , wherein the joint axis is vertically extending.

8. The device according to claim 5 , wherein the cover includes a hinge-side half, the sensor being arranged on the hinge-side half of the cover.

9. The device according to claim 1 , further comprising a high-pass filter of at least 4000 HZ, the high-pass filter being configured for signal processing of a plurality of signals of the sensor.

10. The device according to claim 1 , wherein the control unit further comprises a memory configured for storing a plurality of standard deviations.

11. The device according to claim 10 , wherein at least three of five of the predetermined number of time intervals are impacted by the plurality of vibrations.

12. The device according to claim 10 , wherein the predetermined duration of a respective one of the predetermined number of time intervals is at least 2 seconds.

13. The device according to claim 10 , wherein the predetermined duration of the predetermined number of time intervals is the same.

14. A method for detecting a malfunction, the method comprising the steps of:
providing a device for treating a web of fibrous material according to claim 1 ;
detecting a vibration acceleration using the sensor;
filtering a plurality of vibration signals, corresponding to the plurality of vibrations, by way of a high-pass filter of the device;
determining, upon detecting a predetermined vibration threshold value being exceeded, the vibration acceleration over a predetermined number of time intervals which are predetermined; and
signaling a malfunction if the predetermined vibration threshold value is exceeded in at least half of the time intervals which are consecutive.

15. The method according to claim 14 , wherein the time intervals comprise at least five time intervals, and wherein the step of signaling the malfunction occurs if the predetermined vibration threshold value is exceeded in at least three of the five time intervals which are consecutive.

16. The method according to claim 14 , wherein a measurement occurs over a respective one of the time intervals of at least 2 seconds.

17. The method according to claim 14 , wherein a determination of a standard deviation from a plurality of recorded vibration acceleration signals is continuously conducted for a determination of a vibration intensity, and the standard deviation is used for a detection of the malfunction.

18. The method according to claim 14 , wherein, following each one of a start-up, a basic value of a plurality of operation-related vibrations is taught to eliminate a plurality of basic vibrations caused by an environment.

19. The method according to claim 14 , wherein an axial position of at least one treatment tool of a housing part is adjusted in order to widen at least one treatment gap when the malfunction is detected.

Assignees

• Voith Patent Gmbh

Inventors

• Heim Martin
• Honig Adrian

Classifications

• D21B1/14

  Disintegrating in mills · CPC title

• D21D1/30

  Disc mills · CPC title

• G01M1/22

  and converting vibrations due to imbalance into electric variables · CPC title

• D21D1/20

  Methods of refining · CPC title

• B02C7/14 Primary

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