Monitoring machine wires and felts

Patent metadata

Field	Value
Publication number	US-9863827-B2
Application number	US-201514735947-A
Country	US
Kind code	B2
Filing date	Jun 10, 2015
Priority date	Jun 10, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Collecting data includes generating a sensor signal from each of a plurality of sensors located on a sensing roll, wherein each signal is generated when each sensor enters a region of a nip between the sensing roll and mating roll during each rotation of the sensing roll; wherein a web of material travels through the nip and a continuous band, which also travels through the nip, contacts a region of the web of material upstream from or in the nip. A periodically occurring time reference is generated associated with each rotation of the continuous band and the signal generated by each sensor is received so that the one of the plurality of sensors which generated this signal is determined and one of a plurality of tracking segments associated with the continuous band is identified. The signal is stored to associate the respective sensor signal with the identified one tracking segment.

First claim

The invention claimed is:

1. A system comprising a sensing roll and a mating roll, the system further comprising:
the sensing roll and mating roll located relative to one another to create a nip therebetween, wherein a web of material travels through the nip from an upstream direction to a downstream direction and a continuous band, arranged to travel around in a loop pattern, contacts at least a region of the web of material at the nip;
a plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor enters a region of the nip during each rotation of the sensing roll to generate a respective sensor signal;
structure for generating a periodically occurring time reference associated with each rotation of the continuous band around the loop pattern; and
a processor to receive the periodically occurring time reference and the respective sensor signal generated by each sensor and, upon receiving the respective sensor signal, the processor operates to:
determine a particular one of the plurality of sensors which generated the respective sensor signal,
based upon an amount of time that elapsed between when the respective sensor signal was generated and a most recent time reference, identify one of a plurality of tracking segments associated with the continuous band, wherein each of the plurality of tracking segments is, respectively, associated with a different amount of elapsed time, and
store the respective sensor signal to associate the respective sensor signal with the identified one tracking segment.

2. The system of claim 1 , wherein the continuous band comprises a press felt.

3. The system of claim 1 , wherein the continuous band comprises a wire mesh.

4. The system of claim 1 , wherein the plurality of tracking segments associated with the continuous band comprise a plurality of time segments of a period of the continuous band.

5. The system of claim 1 , wherein the received sensor signal comprises a pressure value.

6. The system of claim 1 , wherein the processor receives:
the respective sensor signal for each of the plurality of sensors during each rotation of the sensing roll, and
a plurality of the respective sensor signals occurring during a plurality of rotations of the sensing roll.

7. The system of claim 6 , wherein, for each one of the plurality of the respective sensor signals, the processor identifies an associated continuous band axial segment and its identified one tracking segment.

8. The system of claim 7 , wherein:
the continuous band comprises n axial segments, having respective index values: 1, 2, . . ., n;
a continuous band rotational period comprises m tracking segments, having respective index values: 1, 2, . . ., m, and
wherein there are (n times m) unique permutations that are identifiable by a two-element set comprising a respective axial segment index value and a respective tracking segment index value.

9. The system of claim 8 , wherein, for the plurality of respective sensor signals and for one or more of the possible (n times m) permutations, the processor determines an average of all the plurality of respective sensor signals associated with an axial segment and tracking segment matching each of the one or more permutations.

10. The system of claim 1 , wherein the structure for generating a periodically occurring time reference comprises:
a signal generator to generate a trigger signal on each rotation of the continuous band, wherein the processor identifies the identified one tracking segment relative to a reference position based on a most-recently-generated trigger signal.

11. The system of claim 1 , wherein the plurality of tracking segments associated with the continuous band comprise one of:
a plurality of circumferential segments on the continuous band, and
a plurality of time segments of a period of the continuous band.

12. A method associated with a sensing roll and a mating roll, the method comprising:
providing the sensing roll and the mating roll;
generating a respective sensor signal from each of a plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each respective sensor signal is generated when each sensor enters a region of a nip between the sensing roll and the mating roll during each rotation of the sensing roll; the sensing roll and mating roll located relative to one another to create the nip therebetween, wherein a web of material travels through the nip from an upstream direction to a downstream direction and a continuous band, arranged to travel around in a loop pattern, contacts at least a region of the web of material at the nip;
generating a periodically occurring time reference associated with each rotation of the continuous band around the loop pattern; and
receiving the respective sensor signal generated by each sensor and, upon receiving the respective sensor signal:
determining a particular one of the plurality of sensors which generated the respective sensor signal,
based upon an amount of time that elapsed between when the respective sensor signal was generated and a most recent time reference, identifying one of a plurality of tracking segments associated with the continuous band, wherein each of the plurality of tracking segments is, respectively, associated with a different amount of elapsed time, and
storing the respective sensor signal to associate the respective sensor signal with the identified one tracking segment.

13. The method of claim 12 , wherein the continuous band comprises a press felt.

14. The method of claim 12 , wherein the continuous band comprises a wire mesh.

15. The method of claim 12 , wherein the plurality of tracking segments associated with the continuous band comprise one of:
a plurality of circumferential segments on the continuous band, and
a plurality of time segments of a period of the continuous band.

16. The method of claim 12 , wherein the received sensor signal comprises a pressure value.

17. The method of claim 12 , comprising:
receiving the respective sensor signal for each of the plurality of sensors during each rotation of the sensing roll, and
receiving a plurality of the respective sensor signals occurring during a plurality of rotations of the sensing roll.

18. The method of claim 17 , comprising:
for each one of the plurality of the respective sensor signals, identifying an associated continuous band axial segment and its determined one tracking segment.

19. The method of claim 18 , wherein:
the continuous band comprises n axial segments, having respective index values: 1, 2, . . ., n;
a continuous band rotational period comprises m tracking segments, having respective index values: 1, 2, . . ., m, and
wherein there are (n times m) unique permutations that are identifiable by a two-element set comprising a respective axial segment index value and a respective tracking segment index value.

20. The method of claim 19 , comprising:
for the plurality of respective sensor signals and for one or more of the possible (n times m) permutations, determining an average of all the plurality of respective sensor signals associated with an axial segment and tracking segment matching each of the one or more permutations.

21. The method of claim 12 , wherein generating a periodically occurring time reference comprises:
generating a trigger signal on each rotation of the continuous band, wherein the identified one tracking segment is identified relative to a reference position bas

Assignees

• Int Paper Co

Inventors

• Figiel Kerry D

Classifications

• D21F1/0027 Primary

  Screen-cloths · CPC title

• D21G9/0036

  controlling the press or drying section · CPC title

• D21F7/08

  Felts · CPC title

• D21F3/02

  Wet presses · CPC title

• G01L5/0085 Primary

  Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers · CPC title