Sensor roll

Patent metadata

Field	Value
Publication number	US-9745698-B2
Application number	US-201414888152-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	Apr 30, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A roll for a machine for producing and/or processing a fibrous web, such as a paper, board or tissue web, has a circular-cylindrical main roll body. A roll cover covers the circumferential surface of the main roll body, at least in some segments. A pressure- and/or temperature-sensitive sensor is embedded in the roll cover. The sensor connects to an electrical and/or optical signal line. The signal line has a first line segment inside the roll. A second line segment extends substantially outside the roll and is connectable to a signal excitation and/or signal processing unit at one end. An electrical and/or optical rotational connection connects the first and second line segments to allow the line segments to be rotated relative to one another. When the roll is rotated, the first line segment rotates together with the main roll body. The second line segment does not have to follow the rotation.

First claim

The invention claimed is:

1. A roll for a machine for producing and/or processing a fibrous web, the roll comprising:
a circular-cylindrical main roll body having a circumferential surface, a longitudinal axis and two axial ends;
bearing journals arranged at said two axial ends of said main roll body for rotatably supporting said roll body about said longitudinal axis on a frame of the machine;
a roll cover covering said circumferential surface of said main roll body at least in some segments thereof;
at least one sensor selected from the group consisting of pressure sensors and temperature sensors;
an electrical and/or optical signal line for signal exchange with a signal excitation and/or signal processing unit, said signal line including a first line segment extending substantially in an interior of said roll and having an end connected to said at least one sensor, a second line segment extending substantially outside said roll and having an end connectable to the signal excitation and/or signal processing unit; and
an electrical and/or optical rotational connection for connecting said first and second line segments to one another and to allow said first and second line segments to rotate relative to one another so that, when the roll is rotated about said longitudinal axis, said first line segment rotates together with said main roll body, whereas said second line segment does not follow the rotational movement.

2. The roll according to claim 1 , wherein said second line segment is detachably or non-detachably connected to said rotational connection.

3. The roll according to claim 1 , wherein said rotational connection comprises a first connecting piece and a second connecting piece, said first and second connection pieces are mounted for rotation relative to one another about an axis of rotation, wherein said first line segment is connected or connectable to said first connecting piece at an end opposite said sensor, and said second line segment is connected or connectable to said second connecting piece at an end thereof opposite the end that is connected or connectable to the excitation and/or signal processing unit.

4. The roll according to claim 1 , wherein said rotational connection is arranged on a free front end of bearing journal.

5. The roll according to claim 1 , wherein said rotational connection is arranged on the roll such that an axis of rotation of said first and second connecting pieces coincides with the axis of rotation of the roll.

6. The roll according to claim 1 , wherein said at least one sensor is a piezoelectric sensor and said signal line is an electrical line, and wherein said rotational connection is an electric rotary connector.

7. The roll according to claim 6 , wherein said electric rotary connector is a slip-ring transmitter.

8. The roll according to claim 1 , wherein said at least one sensor is an optical sensor, said signal line is an optical fiber, and said rotational connection is an optical rotary connector.

9. The roll according to claim 8 , wherein said at least one sensor is a fiber Bragg sensor and said optical rotary connector is a fiber-optic rotary connector.

10. The roll according to claim 8 , wherein said first line segment is connected at one end to at least one sensor segment which includes a plurality of fiber-optic sensors arranged one after another in series.

11. The roll according to claim 10 , wherein said at least one sensor segment is one of a plurality of sensor segments.

12. The roll according to claim 1 , wherein said first line segment of said signal line extends substantially in said roll cover and/or in an interior of said circular-cylindrical main roll body.

13. The roll according to claim 1 , wherein said roll has a diameter of less than 850 mm.

14. The roll according to claim 13 , wherein said roll has a diameter in a range from 100 mm to 800 mm.

15. A roll for a machine for producing and/or processing a fibrous web, the roll comprising:
a circular-cylindrical main roll body having a circumferential surface, a longitudinal axis and two axial ends;
bearing journals arranged at said two axial ends of said main roll body for rotatably supporting said roll body about said longitudinal axis on a frame of the machine;
a roll cover covering said circumferential surface of said main roll body at least in some segments thereof;
at least one sensor selected from the group consisting of pressure sensors and temperature sensors mounted in or on said roll cover;
an electrical and/or optical signal line for signal exchange with a signal excitation and/or signal processing unit, said signal line including a first line segment extending substantially in an interior of said roll and having an end connected to said at least one sensor, a second line segment extending substantially outside the roll and remaining stationary relative to said roll when said roll rotates, and said second line segment having an end connectable to the signal excitation and/or signal processing unit; and
an electrical and/or optical rotational connection for connecting said first and second line segments to one another, said rotational connection having a first connection piece fixedly mounted to said roll for rotation with said roll and with said first line segment, and said rotational connection having a stationary second connection piece fixedly connected to said second line segment, said rotational connection enabling a signal transmission between said sensor and the signal excitation and/or signal processing unit while said first connection piece rotates with the roll and said second connection piece remains stationary and does not rotate with the roll.

Assignees

• Voith Patent Gmbh

Inventors

• Schmitt Matthias
• Ecke Wolfgang
• Breineder Martin

Classifications

• D21F3/08 Primary

  Pressure rolls · CPC title

• G01L5/107

  for measuring a reaction force applied on an element disposed between two supports, e.g. on a plurality of rollers or gliders · CPC title

• D21G1/02

  Rolls; Their bearings (in general F16C13/00) · CPC title

• G01L5/0085

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

• D21G1/0073 Primary

  Accessories for calenders · CPC title