Method and system associated with a sensing roll including pluralities of sensors and a mating roll for collecting roll data

Patent metadata

Field	Value
Publication number	US-9797788-B2
Application number	US-201414268737-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	May 2, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

Collecting roll data associated with a sensing and mating rolls that form a nip uses first and second pluralities of sensors. Each sensor of the first plurality has a corresponding sensor in the second plurality which is associated with a same respective axial location on the sensing roll but is spaced-apart circumferentially. The sensors are located at axially spaced-apart locations of the sensing roll and generate either a first or second respective signal when entering the nip. Upon receiving a generated signal, a determination is made about which sensor generated the received signal and the membership of that sensor in one of the pluralities. Based upon a rotational position of the mating roll, a determination is made of which tracking segment associated with the mating roll enters the region of the nip concurrently with the signal to store the signal using the determined one tracking segment and the determined membership.

First claim

The invention claimed is:

1. A system comprising a sensing roll and a mating roll, the system further comprising:
a first plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor of the first plurality enters a region of a nip between the sensing roll and the mating roll during each rotation of the sensing roll to generate a first respective sensor signal;
a second plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor of the second plurality enters the region of the nip during each rotation of the sensing roll to generate a second respective sensor signal,
wherein each sensor of the first plurality has a corresponding sensor in the second plurality which is associated with a same respective axial location on the sensing roll but is spaced-apart circumferentially; and

a processor to receive a received sensor signal, the received sensor signal comprising one of the first respective sensor signal and the second respective sensor signal, and, upon receiving the received sensor signal, the processor operates to:
determine a particular one of the sensors of the first plurality or second plurality which generated the received sensor signal,
determine membership of the particular one sensor based on which plurality of sensors the particular one sensor is a member,
based upon a rotational position of the mating roll relative to a reference position, determine which one of a plurality of tracking segments associated with the mating roll enters the region of the nip substantially concurrently with the particular one sensor entering the region of the nip, and
store the received sensor signal to associate the received sensor signal with the determined one tracking segment and the determined membership.

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

3. The system of claim 2 , wherein, for each one of the plurality of sensor signals, the processor identifies:
its determined one tracking segment,
an associated mating roll axial segment, and
a specific sensor of the first or second pluralities of sensors which generated said particular one of the plurality of sensor signals, wherein the processor further determines membership of the specific sensor based on which of the plurality of sensors the specific sensor is a member.

4. The system of claim 3 , wherein:
the mating roll comprises n axial segments, having respective index values: 1, 2, . . . , n;
the mating roll period comprises m tracking segments, having respective index values: 1, 2, . . . , m,
wherein, for each of the first plurality of sensors, there are (n times m) unique permutations, respectively, that are identifiable by a first two-element set comprising a respective axial segment index value and a respective tracking segment index value and, for each of the second plurality of sensors, there are (n times m) unique permutations, respectively, that are identifiable by a second two-element set comprising a respective axial segment index value and a respective tracking segment index value; and
a respective average pressure value is associated with each of the (n times m) unique permutations of each of the first and second sets, wherein each of the respective average pressure values is based on previously collected pressure readings related to the nip.

5. The system of claim 4 , wherein:
a first respective column average value is associated with each first set axial segment index value, each first respective column average value comprising an average of the m respective average pressure values, from the first set, associated with that first set axial segment index value; and
a second respective column average value is associated with each second set axial segment index value, each second respective column average value comprising an average of the m respective average pressure values, from the second set, associated with that second set axial segment index value.

6. The system of claim 5 , wherein the processor operates to:
for each one of the plurality of the received sensor signals which defines a pressure reading:
determine a particular axial segment index value and a particular tracking segment index value, based on that signal's associated axial segment, its determined one tracking segment and whether that signal is generated from the first plurality of sensors or the second plurality of sensors;
select the respective average pressure value associated with the particular axial segment index value and the particular tracking segment index value;
calculate a respective corrected average pressure value by subtracting:
one of the first respective column average value or the second respective column average value associated with the particular axial segment index value
from the

selected respective average pressure value; and

calculate a respective adjusted pressure reading value by subtracting the respective corrected average pressure value from the one received sensor signal.

7. The system of claim 6 , wherein the processor operates to:
calculate an average pressure profile based on the respective adjusted pressure reading values.

8. The system of claim 7 , wherein the processor adjusts operating conditions of the rolls using the respective adjusted pressure reading values by adjusting roll loading mechanisms to achieve a desired pressure profile.

9. The system of claim 3 , wherein:
the mating roll comprises n axial segments, having respective index values: 1, 2, . . . , n;
the mating roll has associated therewith m tracking segments, having respective index values: 1, 2, . . . , m, and
wherein, for each of the first plurality of sensors and the second plurality of sensors, 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.

10. The system of claim 9 , wherein:
for the plurality of first respective sensor signals and for each of a first plurality of the possible (n times m) permutations, the processor determines an average of all the plurality of first respective sensor signals associated with an axial segment and tracking segment matching each of the first plurality of permutations; and
for the plurality of second respective sensor signals and for each of a second plurality of the possible (n times m) permutations, the processor determines an average of all the plurality of second respective sensor signals associated with an axial segment and tracking segment matching each of the second plurality of permutations.

11. The system of claim 9 , wherein:
for the plurality of first respective sensor signals and each of a first plurality of the possible (n times m) permutations, the processor determines:
a number of times one or more of the plurality of first respective sensor signals is associated with an axial segment and tracking segment matching that permutation; and
a summation of all of the plurality of first respective sensor signals associated with the axial segment and tracking segment matching that permutation; and

for the plurality of second respective sensor signals and each of a second plurality of the p

Assignees

• Int Paper Co

Inventors

• Figiel Kerry D

Classifications

• G01L5/0085

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

• D21F3/08 Primary

  Pressure rolls · CPC title

• G05D15/01 Primary

  characterised by the use of electric means · CPC title

• G01D21/02

  Measuring two or more variables by means not covered by a single other subclass · CPC title

• G01L1/2275 Primary

  for non linearity · CPC title