Method and system associated with a sensing roll and a mating roll for collecting data including first and second sensor arrays

Patent metadata

Field	Value
Publication number	US-9804044-B2
Application number	US-201414268706-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	May 2, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Collecting roll data associated with a sensing roll and a mating roll forming a nip includes generating sensor signals from a first sensor array on the sensing roll and a second sensor array on the mating roll during rotations of the mating rolls and sensing rolls. A periodically occurring first time reference is associated with each rotation of the mating roll and a periodically occurring second time reference is associated with each rotation of the sensing roll. For a received sensor signal, based on whether the received signal is from the sensors of the mating roll or the sensing roll, a tracking segment on the other roll is detected that enters a region of the nip concurrent with the sensor that generated the received signal. The detection is made from either a most-recent-identified first time reference or second time reference. The received signal can then be stored using the detected tracking segment.

First claim

The invention claimed is:

1. A system comprising a sensing roll and a mating roll, the system further comprising:
a first array of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor of the first array 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 array of sensors located at axially spaced-apart locations of the mating roll, wherein each sensor of the second array enters a region of the nip between the sensing roll and the mating roll during each rotation of the mating roll to generate a second respective sensor signal,
a periodically occurring first time reference associated with each rotation of the mating roll;
a periodically occurring second time reference associated with each rotation of the sensing roll 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 array or second array which generated the received sensor signal,
when the particular one sensor is from the first array, then based upon a first amount of time that has elapsed since a most recent first time reference, determine a detected tracking segment based on which one of a plurality of first tracking segments associated with the mating roll enters the region of the nip substantially concurrently with the particular one sensor from the first array,
when the particular one sensor is from the second array, then based upon a second amount of time that has elapsed since a most recent second time reference, determine a detected tracking segment based on which one of a plurality of second tracking segments associated with the sensing roll enters the region of the nip substantially concurrently with the particular one sensor from the second array; and
store the received sensor signal to associate the received sensor signal with the detected tracking segment.

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

3. The system of claim 2 , wherein, for each one of the plurality of sensor signals, the processor identifies:
its detected tracking segment,
an associated axial segment, and
whether said particular one of the plurality of sensor signals is generated from the first array of sensors or from the second array of sensors.

4. The system of claim 3 , wherein:
the mating roll and the sensing roll each, respectively, comprises n axial segments, having respective index values: 1, 2, . . . , n;
the mating roll and the sensing roll each, respectively has associated therewith, m tracking segments, having respective index values: 1, 2, . . . , m, and
wherein, for the first array of sensors, there are (n times m) unique permutations, respectively, that are identifiable by a two-element first set comprising a respective first axial segment index value and a respective first tracking segment index value and for the second array of sensors, there are (n times m) unique permutations, respectively, that are identifiable by a two-element second set comprising a respective second axial segment index value and a respective second tracking segment index value.

5. The system of claim 4 , wherein:
a respective average pressure value is associated with each of the (n times m) unique permutations of each of the first and second sets, each of the respective average pressure values based on previously collected pressure readings related to the nip.

6. The system of claim 5 , wherein:
a first respective column average value is associated with each first 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 axial segment index value, and
a second respective column average value is associated with each second 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 axial segment index value.

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

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

9. The system of claim 8 , 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.

10. The system of claim 4 , wherein,
for the plurality of first respective sensor signals and for a first plurality of the possible (n times m) permutations, the processor determines an average of all the plurality of respective first sensor signals associated with a mating roll axial segment and first tracking segment matching each of the first plurality of permutations, and
for the plurality of second respective sensor signals and for a second plurality of the possible (n times m) permutations, the processor determines an average of all the plurality of respective second sensor signals associated with a sensing roll axial segment and detected second tracking segment matching each of the second plurality of permutations.

11. The system of claim 4 , 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 are associated with a mating roll axial segment and first tracking segment matching that permutation; and
a summation of all of the plurality of first respective sensor signals associated with the mating roll axial segment and first tracking segment matching that permutation, and

for the plurality of second respective sensor signals and each of a second plurality of the possible (n times m) permutations, the processor determines:
a number of times

Assignees

• Int Paper Co

Inventors

• Figiel Kerry D

Classifications

• G01L5/0085 Primary

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

• G01L5/0028 Primary

  Force sensors associated with force applying means (G01L5/0052, G01L5/0057, G01L5/0061 take precedence) · CPC title

• D21F3/08 Primary

  Pressure rolls · CPC title