Unknown

Abstract

A measuring roller for determining a property of a strip-shaped material such as metal strip, passed over a measuring roller, having a measuring roller body with a circumferential surface, at least one recess in the measuring roller body, which is arranged at a distance from the circumferential surface or leads from the circumferential surface into the interior of the measuring roller body, and with a first force sensor arranged in the recess and a second force sensor arranged in the recess or in a further recess adjacent to the recess, wherein the first force sensor has a sensor surface and the first force sensor can generate a sensor signal when the position of the sensor surface of the first force sensor changes, and the second force sensor has a sensor surface and the second force sensor can generate a sensor signal when the position of the sensor surface of the second force sensor changes.

Claims

1.-7. (canceled)

8. A measuring roller for determining a property of a strip-shaped material passed over the measuring roller, comprising a measuring roller body with a circumferential surface, at least one recess in the measuring roller body, a force sensor arranged in the recess and a cover which at least partially closes the recess and which, viewed in the radial direction of the measuring roller body, is arranged above the force sensor, wherein the measuring roller body has an axis of rotation (A); and wherein: the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface, the geometric shape of which is mirror-symmetrical with respect to a plane of symmetry containing the axis of rotation, but the geometric shape of which is not mirror-symmetrical with respect to planes perpendicular to the axis of rotation, or the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface whose geometric shape is mirror-symmetrical with respect to a plane of symmetry running perpendicular to the axis of rotation, but whose geometric shape is not mirror-symmetrical with respect to planes containing the axis of rotation, or the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface, the geometric shape of which is not mirror-symmetrical both with respect to planes which are perpendicular to the axis of rotation and with respect to planes which contain the axis of rotation.

9. The measuring roller of claim 8, wherein the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface, the geometric shape of which is mirror-symmetrical with respect to a plane of symmetry containing the axis of rotation, but the geometric shape of which is not mirror-symmetrical with respect to planes perpendicular to the axis of rotation.

10. The measuring roller of claim 8, wherein the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface whose geometric shape is mirror-symmetrical with respect to a plane of symmetry running perpendicular to the axis of rotation, but whose geometric shape is not mirror-symmetrical with respect to planes containing the axis of rotation.

11. The measuring roller of claim 8, wherein the cover has an outer surface and/or the force sensor has an outer surface and/or an intermediate piece arranged between the cover and the force sensor has an outer surface, the geometric shape of which is not mirror-symmetrical both with respect to planes which are perpendicular to the axis of rotation and with respect to planes which contain the axis of rotation.

12. The measuring roller of claim 8, wherein the strip-shaped material is a metal strip.

13. The measuring roller of claim 8, further comprising a layer coating over the recess.

14. The measuring roller of claim 8, wherein the measuring roller body comprises a sheath.

15. A method for determining a property of a strip-shaped material comprising: passing the strip shaped material over a measuring roller having: a measuring roller body with a circumferential surface, at least one recess in the measuring roller body, at least one beam disposed in the recess and extending along a longitudinal axis, and a force sensor arranged in the recess where the beam is supported within the recess on the force sensor; and where the measuring roller body extends along an axis of rotation (A) and the longitudinal axis of the beam is not parallel to the axis of rotation (A) of the measuring roller body and the longitudinal axis of the beam does not extend in a plane perpendicular to the axis of rotation (A) of the measuring roller body, where the position of a strip edge of the strip-shaped material is determined relative to a reference point or a reference line or a reference plane when the strip-shaped material is passed over the measuring roller.

16. The method of claim 15, wherein the strip-shaped material is formed of a metal strip.

17. The method of claim 15, comprising arranging on the measuring roller a first force sensor in the recess and a second force sensor arranged in the recess, where the beam is supported within the recess on the first force sensor and on the second force sensor.

18. The method of claim 15, further comprising forming a layer coating over the recess.

19. The method of claim 15, wherein the measuring roller body comprises a sheath.

20. A method for determining the position of a strip edge of a strip-shaped material relative to a reference point or a reference line or a reference plane when the strip-shaped material is passed over the measuring roller, comprising: guiding the strip-shaped material over a measuring roller, the measuring roller having a measuring roller body with a circumferential surface, at least one recess in the measuring roller body, at least one beam disposed in the recess and extending along a longitudinal axis, and a force sensor arranged in the recess; wherein the beam is supported within the recess on the force sensor and where the measuring roller body extends along an axis of rotation (A) and the longitudinal axis of the beam is not parallel to the axis of rotation (A) of the measuring roller body and the longitudinal axis of the beam is not in a plane perpendicular to the axis of rotation (A) of the measuring roller body, where the strip-shaped material is guided over the measuring roller such that a strip edge of the strip-shaped material reaches a position once during one revolution of the measuring roller, which position is above the bar as seen in the radial direction of the measuring roller body, generating a measurement signal by the force sensor, determining the position of the strip edge of the strip-shaped material relative to a reference point or a reference line or a reference plane from the measurement signal of the force sensor.

21. The method of claim 20, wherein the strip-shaped material is formed of a metal strip.

22. The method of claim 20, further comprising arranging on the measuring roller a first force sensor in the recess and a second force sensor arranged in the recess, where the beam is supported within the recess on the first force sensor and on the second force sensor.

23. The method of claim 20, further comprising forming a layer coating over the recess.

24. The method of claim 20, wherein the measuring roller body comprises a sheath.

25. A measuring roller for detecting a property of a strip-shaped material, passed over the measuring roller, comprising a measuring roller body with a circumferential surface, at least one first recess in the measuring roller body, the first recess having a first cross-sectional shape, at least one beam disposed in the first recess and extending along a longitudinal axis, and a force sensor arranged in the recess wherein the beam is supported within the first recess on the force sensor, and where the measuring roller body extends along an axis of rotation (A) and the longitudinal axis of the beam does not run parallel to the axis of rotation (A) of the measuring roller body and the longitudinal axis of the beam does not run in a plane which is perpendicular to the axis of rotation (A) of the measuring roller body, and wherein at least one further recess is arranged in the measuring roller body, a second force sensor (304) being arranged in the further recess, the further recess having a second cross-sectional shape which is different from the first cross-sectional shape of the first recess.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0148] The invention is explained in more detail below with reference to examples of embodiments shown in the drawings.

[0149] FIG. 1 is a schematic view of a measuring roller to be used according to the invention for determining the strip edge position;

[0150] FIG. 2 is a schematic representation of the circumferential surface of the measuring roller body of the measuring roller unwound into a plane and of the strip-shaped material running over this circumferential surface;

[0151] FIG. 3 is a schematic sectional drawing through a part of the measuring roller and a recess made in the measuring roller body with beams and first force sensor and second force sensor arranged in the recess;

[0152] FIG. 4 is a section of the illustration according to FIG. 2;

[0153] FIG. 5 is a plan view of a portion of the circumferential surface of a measuring roller according to the invention;

[0154] FIG. 6 is a sectional view of a part of the measuring roller according to the invention along section line A-A in FIG. 5;

[0155] FIG. 7 is a sectional view of a part of the measuring roller according to the invention along the line of intersection B-B in FIG. 5;

[0156] FIG. 8 is a sectional view, comparable to the view according to FIG. 6, of a part of a further embodiment of a measuring roller according to the invention;

[0157] FIG. 9 is a schematic top view of a force sensor of a measuring roller;

[0158] FIG. 10 is a schematic top view of an intermediate piece and a force sensor of a measuring roller;

[0159] FIG. 11 is a schematic top view of an intermediate piece and a force sensor of a measuring roller; and

[0160] FIG. 12 is a schematic representation of the forces acting on a measuring pulley.

DETAILED DESCRIPTION

[0161] According to FIG. 1, the measuring roller 1 to be used for the strip edge position has journals 2 and has a measuring roller body 1a designed as a solid roller. The measuring roller body 1a has a rotation axis A, which is also the longitudinal axis A of the measuring roller body 1a.

[0162] The measuring roller body 1a is designed as a cylinder and has a circumferential surface 1b. The circumferential surface 1b of the cylindrical measuring roller body 1a is shown as an unrolled surface in FIG. 2.

[0163] The embodiment shown in FIG. 1 has two recesses 300. A beam 301 is disposed in each of the two recesses 300. The respective beam 301 extends along a longitudinal axis 302. In the embodiment shown in FIG. 1, the respective beam 301 is substantially rectangular in shape and has semi-circular ends at its ends, consequently the end faces of this beam 301 are curved surfaces, namely partial surfaces of a cylinder. In the embodiment shown in FIG. 2, the end faces are flat surfaces.

[0164] In the embodiment shown in FIG. 1, a first force sensor 303 and a second force sensor 304 are disposed in each recess 300. The respective beam 301 is supported within the recess on the first force sensor 303 and the second force sensor 304. The respective longitudinal axis 302 of the respective beam 301 does not run parallel to the axis of rotation A of the measuring roller body 1a and does not run in a plane perpendicular to the axis of rotation A of the measuring roller body 1a. The beams 301 run diagonally across the measuring roller body 1a.

[0165] FIG. 1 shows the center plane 305 of the measuring roller body 1a. The center plane 305 is perpendicular to the axis of rotation A of the measuring roller body 1a and is located midway between one end 306 of the measuring roller body 1a and the second end 307 opposite the first end 306.

[0166] The first beam 301 includes a first end 308 and a second end 309 opposite the first end 308, the first end 308 and the second end 309 of the first beam 301 being disposed on one side of the center plane 305. The second beam 301 includes a first end 310 and a second end 311 opposite the first end 310, the first end 310 and the second end 311 of the second beam 301 being disposed on the opposite side of the center plane 305. Neither the first beam 301 nor the second beam 301 cross the center plane. The first beam 301 and the second beam 301 are configured so that [0167] the first end 308 of the first beam 301 is arranged closer to the first end 306 of the measuring roller body 1a than to the center plane 305, [0168] the second end 309 of the first beam 301 is arranged closer to the center plane 305 than the first end 308 of the measuring roller body 1a, [0169] the first end 310 of the second beam 301 is arranged closer to the second end 307 of the measuring roller body 1a than to the center plane 305, [0170] the second end 311 of the second beam 301 is disposed closer to the center plane 305 than the first end 310, [0171] the first end 308 of the first beam 301 and the first end 310 of the second beam 310 are arranged on a line 312 that is parallel to the axis of rotation A of the measuring roller body 1a.

[0172] The first beam 301 and the second beam 301 are mirror symmetrical with respect to the center plane 305.

[0173] FIG. 3 shows that the beam 301 has a top surface 313 and a bottom surface 314. The upper side 313 is arranged radially further out than the lower side 314. The top surface is arranged in a curved surface 315, which is cylindrical and parallel to the cylindrical peripheral surface 1b of the measuring roller body 1a.

[0174] FIG. 3 shows a coating application 316 that was applied from above to the top surface 313 of the beam 301. The layer application 316 closes the recess 300 and creates a closed circumferential surface 1b of the measuring roller body 1a. The 316 layer coating can be produced by additive manufacturing processes. The 316 overlay can be produced by buildup welding. The layered coating 316 can be produced in the course of 3D printing, in particular preferably 3D printing of the entire measuring roller body 1a.

[0175] To determine the position of the strip edge 317 of the strip-shaped material 318 (the strip 318), the strip 318 is guided over the measuring roller 1 in such a way that it surrounds it with a wrap angle ALPHA (cf. FIG. 12). The movement of the belt 318 causes the measuring roller 1 to rotate about the axis of rotation A. In addition, a drive can be provided to support the rotation of the measuring roller 1 about the axis of rotation.

[0176] In FIG. 2 and FIG. 4, the belt 318 is partially shown. For clarity, the tape 318 has been cut at the line where the tape 318 first comes into contact with the first beam 301 (the run-up point 319). In reality, the tape 318 extends from the cut edge 320 even further to the right in FIGS. 2 and 4. The tape 318 is moved in the direction of the arrow 321 over the measuring roller 1. This movement causes the belt 318 to rotate the measuring roller 1 also in the direction of the arrow 321. By rotating the measuring roller 1, the first bar 301 and the second bar 301 are brought into contact with the tape 318 once per revolution of the measuring roller 1. Due to the oblique position of the beams 301, the position of the point at which the respective beam 301 first makes contact with the belt 318 per revolution (the respective run-up point 319) depends on the position of the belt edge 317 relative to the center plane 305 or on the position of the belt edge 317 relative to the first end 306 or on the position of the belt edge 317 relative to the second end 307. In the operating situation shown in FIGS. 2 and 4, the upper belt edge 317 is further away from the center plane 305 than the lower belt edge 317. The distance of the upper band edge 317 to the first end 306 of the measuring roller body 1 a is smaller than the distance of the lower band edge 317 to the second end 307 of the measuring roller body 1 a. Therefore, the distance from the point of contact 319 of the upper edge 317 of the band on the first beam 301 to the first end 308 of the first beam 301 is less than the distance from the point of contact 319 of the lower edge 317 of the band on the second beam 301 to the first end 310 of the second beam 301. In the operating situation shown in FIGS. 2 and 4, the upper belt edge 317 has just run onto the first beam 301, while the lower belt edge 317 has not yet run onto the second beam 301. The force sensors on which the first beam 301 is supported already give a signal. The force sensors on which the second beam 301 is supported do not yet give a signal.

[0177] FIG. 4 shows that the distance of the tape edge 317 from the first end 306 of the measuring roller 1 is given by the formula

by=b−(ax/tan(BETA))

can be calculated, where [0178] b=axial distance of the point of the second end 309 of the beam 301 closest to the center plane 305; [0179] ax=distance in circumferential direction between the point of the second end 309 of the beam 301 closest to the center plane 305 and the run-up point 319 (first deflection of the measuring signal); [0180] BETA=angle between roller axis and beam.

[0181] The distance ax can be determined via a rotary encoder. The encoder can also be used to resolve the signal from the force sensor in relation to the angle of rotation. This makes it possible to determine at which angle of rotation the initial deflection of the force sensor signal occurs. If, for example, the distance ax at which the angle of rotation is present is stored in a table, the value ax can be determined from monitoring the signal of the force sensor in relation to the angle of rotation. If the initial deflection of the signal is determined and output at which angle of rotation the initial deflection occurs, the value ax associated for this angle of rotation can be determined via the angle of rotation and an assignment table between angle of rotation and ax.

[0182] FIG. 1 shows that the measuring roller alone can be designed to determine the strip edge position and with it—if desired—the strip width. For such an application, the measuring roller 1 is only equipped with two beams 301.

[0183] FIG. 2 shows that the beams 301 to be used for determining the strip edge position can be combined with further force sensors in further recesses, which can be used for determining flatness, for example. Thus, FIG. 2 shows a first row of recesses 203 and a second row of recesses 203.

[0184] In the embodiment shown in FIGS. 1, 2, the cover designed as a beam 301 is designed to have an outer surface whose geometric shape is designed to be non-mirror symmetrical both with respect to planes that are perpendicular to the axis of rotation A and with respect to planes that contain the axis of rotation A. The outer surface of the cover is designed to have a geometric shape that is not mirror symmetrical.

[0185] FIG. 5 shows a top layer on a part of the outer surface of a measuring roller 1 according to the invention. The measuring roller 1 has a cutout 400. Two molded bodies 401 and 402 and a cover 403 are disposed in the cutout 400. The cover 403 has a trapezoidal cross-sectional shape in the plan view of FIG. 5, which corresponds to a plan view along a radial of the measuring roller body 1a. The cover is held by a clamping screw 404. The molded bodies 401, 402 are held in place by fastening screws 405. In FIG. 5, the axis of rotation A of the measuring roller body 1a is drawn. FIG. 5 shows that the cover 403 is configured so that [0186] the cover 403 has an outer surface whose geometric shape is not mirror-symmetrical with respect to planes perpendicular to the axis of rotation A, as well as with respect to planes containing the axis of rotation A.

[0187] FIGS. 6, 7 show that an intermediate piece 407 is arranged between the cover 403 and the force sensor 406. The intermediate piece 407 is stepped, but is symmetrical in cross-sections perpendicular to the longitudinal axis of the fastening screw 404, namely round. The force sensor 406 is circular around the longitudinal axis of the mounting screw 404.

[0188] FIG. 6 shows that the molded bodies 401, 402 overhang the recess 408 in the measuring roller body 1a.

[0189] The cutout 400 in the measuring roller body 1a has a flat base 409.

[0190] FIG. 8 shows that the cover 403 and the molded bodies 401, 402 can be part of a one-piece body. A punch 410 embodied in the body may be provided, which is disposed above the intermediate member 407, preferably in contact with the intermediate member 407. The punch 410 is made by an annular free cut 411 in the body.

[0191] FIG. 9 shows a top view of a force sensor 412 arranged in a similarly shaped recess in the measuring roller body 1a, which is not shown in detail. The axis of rotation A is shown in FIG. 9. FIG. 9 shows a design in which [0192] the force sensor 412 has an outer surface whose geometric shape is not mirror-symmetrical with respect to planes perpendicular to the axis of rotation as well as with respect to planes containing the axis of rotation.

[0193] FIG. 10 shows a top view of a (dash-dotted, circular) force sensor 413, which is arranged in an identically shaped recess in the measuring roller body 1a that is not shown in greater detail. An intermediate piece 414 is provided above the force sensor 413 and below a cover (not shown in FIG. 10). The axis of rotation A is shown in FIG. 10. FIG. 10 shows a design in which [0194] the intermediate piece 414 arranged between the cover and the force sensor 413 has an outer surface whose geometric shape is designed to be mirror-symmetrical with respect to a plane of symmetry containing the axis of rotation A, but whose geometric shape is not designed to be mirror-symmetrical with respect to planes that are perpendicular to the axis of rotation A.

[0195] FIG. 11 shows a top view of a (dash-dotted, circular) force sensor 415 arranged in an identically shaped recess in the measuring roller body 1a, which is not shown in greater detail. An intermediate piece 416 is provided above the force sensor 415 and below a cover (not shown in FIG. 10). The axis of rotation A is shown in FIG. 11. FIG. 11 shows a design in which [0196] the intermediate piece 416 arranged between the cover and the force sensor 415 has an outer surface whose geometric shape is not mirror-symmetrical both with respect to planes which are perpendicular to the axis of rotation A and with respect to planes which contain the axis of rotation A.

[0197] FIG. 12 shows the forces applied to the measuring roller 1 by a metal strip which partially wraps around the measuring roller 1 and is under strip tension. The quartz force sensors arranged in recesses in the measuring roller 1 generate an electric charge. This is directly proportional to the force applied to the quartz.

[0198] The strip length deviation, usually measured in I-units and commonly used as a representative of strip flatness, can be calculated based on the following relationships: [0199] Local radial force in N [0200] FR,i [0201] Local tensile force in N FZ,i=FR,i/(2×sin α/2) [0202] α=tape deflection angle around measuring roller [0203] Local tensile stress in N/mm2 Z,i=FZ,i/(bEl×d) [0204] bEl=measuring zone width [0205] d=strip thickness [0206] Tensile stress deviation in N/mm2 ΔZ,i=Z,max−Z,i [0207] Z,max=maximum local tensile stress [0208] Strip length deviation in μm/m

ΔL/Li=(ΔZ,i/E)×106

E=E-module (E-steel=2.06×105 N/mm2) [0209] Strip length deviation in I-unit

ΔL/Li=(ΔZ,i/E)×105

E=E-module (E-steel=2.06×105 N/mm2)

[0210] Example: [0211] Quartz force sensor: Sensitivity=4.2 pC/N [0212] Charge at the sensor: =210 pC [0213] Force on the sensor: FR,i=50 N [0214] FZ,i=50/(2×0.342/2)=146, 19 N α=20° Z,i=146, 19/(25×0.5)=11, 69N/mm2 bEl=25 mm, d=0.5 mm ΔZ,i=20−11.69=8.3 N/mm2 Z,max=20 N/mm2 ΔL/Li=(ΔZ,i/E)×106=162.34 μm/m E=E-modulus (E-steel=2.06×105 N/mm2) ΔL/Li=(ΔZ,i/E)×105=16,234 I-Unit.