EP2756890A1 - Method and measuring roller for the determination of flatness deviation of a strip-shaped material - Google Patents

Abstract

The measuring roll (4) has a longitudinal axis and a sensor arranged in a recess of the measuring roll. The sensor is provided for generating a measuring signal depending on a force applied on an outer surface of the measuring roll. A first temperature sensor is arranged at a first distance in a radial direction away from the longitudinal axis. A second temperature sensor is arranged in a second distance different from the first distance in the radial direction away from the longitudinal axis. An independent claim is included for a method for determining flatness deviations of a band-like material.

Description

The invention relates to a measuring roller and a method for determining flatness deviations of a strip-shaped material.

From the DE 29 44 723 A1 a measuring roller for detecting deviations in planarity in the treatment of strip-shaped material is known, in which the measuring roller is designed as a hollow roller consisting of rings held together by means of clamping bolts. Another design of a measuring roller for detecting flatness deviations when treating strip-shaped material is made DE 42 36 657 A1 known. Out DE 102 07 501 C1 It is known to design the measuring roller for determining flatness deviations when treating strip-shaped material as a full roll and to arrange the sensors in axially accessible recesses. Other possibilities of installing sensors within the measuring roller are off DE 196 16 980 B4 and DE 198 38 457 B4 known. Out DE 10 2006 003 792 A1 a holder for a pressure sensor is known, by means of which the sensor can be held in a recess of a measuring roller.

The measuring rollers known from the prior art already provide good measuring results in terms of the flatness deviations of a strip-shaped material in their practical use. The known from the prior art measuring rollers are known in particular for their use in determining flatness deviations in the treatment of metal strips. The metal band is moved over the co-rotating measuring roller guided so that it partially wraps around the outer surface (peripheral surface) of the measuring roller. This looping of the measuring roller causes the metal strip to introduce radial forces onto the outer surface of the measuring roller. By means of sensors introduced in the measuring roller, a measuring signal dependent on the force applied to the outer surface of the measuring roller is generated. By providing a plurality of such sensors in different sectors of the measuring roller can be determined whether the metal strip at different locations of the outer surface of the measuring roller introduces different forces. If different measurement signals result, this alone is already an indicator that flatness deviations exist. Furthermore, it is possible to obtain from an analysis of the difference of the measurement signals information about how strong the flatness deviation is and at which point of the band the flatness deviation exists.

Against this background, the object of the invention was to propose a measuring roller and a method for determining flatness deviations of a band-shaped material with which the flatness deviations can be measured more precisely and / or more simply.

This object is achieved by the subject matter of the independent claims. Preferred embodiments are given in the subclaims and the following description.

The invention is based on the basic idea, in addition to the measures provided for such a measuring rollers at least one sensor that can generate a dependent of a introduced on the outer surface of the measuring roller force measuring signal, a first temperature sensor at a first distance in the radial direction from the longitudinal axis of the Measuring roller is disposed away, and a second temperature sensor, which is arranged in a second, different from the first distance distance in the radial direction away from the longitudinal axis to use. This additional arrangement of a first and a second temperature sensor at different radial distances from the longitudinal axis makes it possible to determine a change in temperature between the location at which the first temperature sensor is arranged and the location at which the second temperature sensor is arranged. Experiments have shown that the way in which the force applied to the outer surface of the measuring roller is conducted through the measuring roller in such a way that it can be picked up by the sensor to produce a measuring signal dependent on this force can depend on the temperature conditions. The temperature measured at the location of the first temperature sensor or the temperature measured at the location of the second temperature sensor and / or the difference between these two temperatures can be used to correct the measurement signal generated by the sensor as a function of the applied force, for example if the altitude of the measuring signal at first temperature conditions means that a force of a certain first height has been applied to the outer surface of the measuring roller, while the same level of the measuring signal at other temperature conditions may mean that a force of a different height has been applied to the outer surface of the measuring roller. Likewise, the arrangement of the first temperature sensor and the second temperature sensor in the inventive manner provides the opportunity to draw conclusions about the change in the bias of a built-in bias in a preferred embodiment sensor in the recess. Thus, experiments have shown that conclusions can be drawn from the difference between the temperature measured at the location of the first temperature sensor and the temperature measured at the location of the second temperature sensor on the change in the preload of a sensor installed under prestress.

The measuring roller according to the invention may be a hollow roller, which consists of rings which are held together by means of clamping bolts, as for example from the DE 29 44 723 A1 is known. In a preferred embodiment, the measuring roller is designed as a so-called full roll. This is understood to mean a measuring roller which essentially has a one-piece basic body. This usually consists of a cylindrical central part, which has at its ends pins for supporting the measuring roller. To form the measuring roller of this body is then usually supplemented only by a few components, such as the at least one sensor that can generate a dependent of a force introduced on the outer surface of the measuring roller force measuring signal, plus the cabling required for this sensor or such sensors. Furthermore, such trained as a full roll measuring rollers may have surface coatings. In addition, other small parts that serve to attach the sensors in the recesses. However, such a full role is characterized by the massive, one-piece body.

In a preferred embodiment, the measuring roller consists essentially of steel.

It has been found that these materials are particularly well suited for the transmission of the force introduced at the outer surface of the measuring roller to the sensor for generating the force-dependent measuring signal. Furthermore, measuring rolls made of such material may be used in particular in one of the preferred fields of use of the invention, namely in the treatment of hot or hot metal strips, which in preferred applications at the time of measurement temperatures of more than the prevailing room temperature, particularly preferably more than 50 ° C and more preferably more than 300 ° C.

The recess in which the at least one sensor is arranged for generating the force-dependent measurement signal can, in a preferred embodiment, be a recess introduced radially from the outer surface into the measuring roller, as can be seen for example in FIG DE 196 16 980 B4 or DE 198 38 457 B4 is known. In another preferred embodiment, however, the recess in which the sensor is arranged for generating the force applied to the applied measuring signal, but carried out axially, as it is known from DE 102 07 501 C1 is known.

In a preferred embodiment, the sensor is installed under prestress in the recess, for example as part of an assembly of several parts arranged in the recess. One possibility of installation under bias is from the Fig. 6, 7 as well as in further education from the Fig. 9 . 10 and 11 of the DE 102 07 501 C1 known, which can also be used in the present invention for the installation of the sensor in the recess.

The advantages of the invention can already be achieved with measuring rollers which have only a single or a few sensors which can generate a measuring signal dependent on a force applied to the outer surface of the measuring roller. In a preferred embodiment, a plurality of such sensors are arranged at different locations in the circumferential direction of the measuring roller. The number of sensors arranged in the circumferential direction increases the resolution with which flatness deviations are detected on the band-shaped material when it is brought into contact with the outer surface of the measuring roller and a movement of the band-shaped material in the tape direction is accompanied by a rotation of the measuring roller. If only a few sensors are used in the circumferential direction of the measuring roller, then it may be that the part of the surface of the strip-like material to be examined, which has a particularly pronounced flatness deviation, just in the sector of the measuring roller contacts the surface of the measuring roller, in which no sensor is located is provided.

One possible arrangement of the sensors in the measuring roller is in Fig. 5 of the DE 102 07 501 C1 shown, wherein it is also conceivable to provide a plurality of sensors in the recesses shown there, as for example in Fig. 9 is shown. As with the number of sensors in the circumferential direction of the measuring roller, the resolution increases in the tape direction of the tape-like Guts, increases the number of sensors in the axial direction of the measuring roller, the resolution of the measurement result in the band width direction of the strip-shaped Guts (ie in the direction perpendicular to the tape direction of the band-shaped Guts and not in the thickness direction of the band-shaped material).

In a preferred embodiment, one or more or all of the temperature sensors provided may be arranged such that they can measure the temperature of the outer surface (the peripheral surface) of the measuring roller or for example, can measure the temperature of the end face of the cylindrical part of a one-piece body. In a preferred embodiment, one or more or all temperature sensors are arranged within the measuring roller. In a particularly preferred embodiment, the temperature sensors arranged within the measuring roller are arranged in recesses. In a particularly preferred embodiment, the temperature sensors are mounted in the recesses so that they can measure the surface temperature of a surface portion bounding the recess. Alternatively, the temperature sensors can be arranged such that they can measure the temperature of the fluid present in the recess, usually air. Alternatively, the temperature sensors can be arranged such that they can measure the temperature of the fluid present in the recess, usually air.

In a preferred embodiment, the temperature sensors measure the temperature to be measured by them by means of contact. For example, resistance thermometers (PT 100 sensors) or thermocouples can be used as temperature sensors. However, it is also conceivable that the temperature sensors, for example, optically measure, be it for example by an infrared measurement or for example by emitting laser beams and determining the temperature of the laser beam reflected from the surface to be measured.

In a preferred embodiment, a first temperature sensor and a second temperature sensor are arranged in the same recess of the measuring roller. Particularly preferably, the first temperature sensor and the second temperature sensor are arranged in the same recess, in which there is also a sensor for generating the measurement signal dependent on the introduced force. In a preferred embodiment, in particular in an embodiment with a sensor also provided in the recess, the first temperature sensor can be arranged such that it measures the temperature of the radially outwardly directed, inwardly facing boundary surface of the recess, and the second temperature sensor measures the temperature of the recess radially further inside, outwardly facing surface of the boundary of the recess measures.

In a preferred embodiment, the first temperature sensor and the second temperature sensor are arranged substantially in a same plane to which the longitudinal axis forms a normal. It has been found that for the improvement of the measurement signal generated by the sensor as a function of the introduced force, it is possible in particular for the change in the internal temperature of the measuring roller that is present in the radial direction to be significant. Therefore, in the preferred embodiment, it is appropriate to arrange the first temperature sensor and the second temperature sensor in a plane to which the longitudinal axis is the normal. In such a Arrangement, the temperature sensors primarily measure the temperature change in the radial direction. Particularly preferably, the first temperature sensor and the second temperature sensor are arranged so that they are arranged substantially on a line pointing in the radial direction of the measuring roller from the longitudinal axis. In particular, in one of the preferred fields of application of the invention, namely the detection of deviations in planarity when treating hot metal strips, it is to be expected that particularly high temperatures prevail in the sector of the measuring roll which is in contact with the strip, while in other sectors of the measuring roll significantly lower temperatures prevail, in particular, when the measuring roller is cooled to protect the measuring device. Particularly in such an application, advantages are associated with arranging the first temperature sensor and the second temperature sensor substantially on a line pointing in the radial direction of the measuring roller from the longitudinal axis. This ensures that the first temperature sensor and the second temperature sensor are arranged substantially in the same sector of the measuring roller and thus can determine the temperature profile in the interior of the measuring roller just in this sector.

The first temperature sensor and / or the second temperature sensor can also be provided as part of a holder for the sensor which generates the force-dependent measurement signal. For example, the first temperature sensor and / or the second temperature sensor can be installed in a holder for a pressure sensor, which can measure a pressure acting on top of him, with a first above the pressure sensor provided for installation position disposed inner wedge member with a to the mounting position of the pressure sensor and a first outer wedge element with an inner surface facing the installation position of the pressure sensor, with which the outer wedge element rests on the outer surface of the first inner wedge element, and with an outer surface opposite the inner surface and a second inner wedge element disposed below the installation position provided for the pressure sensor with an inner surface facing the installation position of the pressure sensor and an inner surface at an angle to the inner surface opposite outer surface and a second outer wedge member having an inner surface facing the installation position of the pressure sensor, with which the outer wedge member rests on the outer surface of the second inner wedge member, and having an inner surface opposite the outer surface.

In a preferred embodiment of the designs in which the first temperature sensor and / or the second temperature sensor are provided as part of such a holder, a temperature sensor on the first inner wedge element, the first outer wedge element, the second inner wedge element or the second outer wedge element be provided and in particular be arranged so that it measures a surface temperature of a surface of the wedge element, which it is assigned.

In a preferred embodiment, a temperature element may be disposed on an outer wedge member so as to measure the temperature of the surface of the wall defining the recess into which the support is mounted and against which the outer wedge member is pressed.

In a particularly preferred embodiment, the first temperature sensor is assigned to the first outer wedge element and the second temperature sensor is assigned to the second outer wedge element. Particularly preferably, the first temperature sensor measures the temperature of an upper surface of the wall defining the recess into which the holder is mounted and against which the outer wedge element is pressed, and the second temperature sensor measures the temperature of a lower surface of the wall containing the recess limited, in which the holder is installed and against which the outer wedge member is pressed.

In a preferred embodiment, the holder is formed with respect to a plane passing through the installation position of the pressure sensor, arranged perpendicular to the direction of action of the pressure force to be measured plane geometrically symmetrical. Even the coordination of the geometry of the above the pressure sensor and arranged below the pressure sensor components reduces the tilting moments occurring during toughening and can even completely avoid them.

Alternatively or additionally, the holder may be formed symmetrically with respect to a plane passing through the installation position of the pressure sensor, arranged perpendicular to the direction of action of the pressure force to be measured with respect to the materials used for the components forming the holder and / or with respect to the surface textures of these components. Tipping moments can be generated not only by geometrical differences of the above and below the pressure sensor components provided, but also in that due to different choice of material or different surface conditions different frictional forces between mutually moving surfaces above and below the pressure sensor arise. This can be prevented by the symmetrical design of the relevant materials or surface textures.

In a preferred embodiment, a connection is provided which connects the first inner wedge element and the second inner wedge element to prevent relative displacement in a direction which is not the effective direction of the compressive force to be measured. The tilting moments to be avoided can also arise because of comparable components above the pressure sensor and below the pressure sensor do not move in sync with each other. This can be avoided if the components in question are connected to each other. Preferably, however, this connection is designed such that it allows a displacement of the two connected components in the effective direction of the pressure force to be measured. In brackets for pressure sensors, which are to measure a force acting on top of it, is preferably by constructive measures to keep the force shunt as low as possible, so the part of the measured force to be measured, which is passed by the holder on the pressure sensor, small too hold. This is done by the components are designed to be resilient relative to each other in the effective direction of the pressure force to be measured and the spring stiffness of the force bridge resulting from the connection is minimized.

In a further embodiment of the invention, a connection is provided which connects the first outer wedge element and the second outer wedge element for avoiding relative displacement in a direction which is not the effective direction of the compressive force to be measured. As a result, the same advantages as in the connection of the inner wedge elements are achieved.

Even if the outer surface of the first inner wedge element and / or the outer surface of the second inner wedge element can be flat in the manner of a flat wedge, in a preferred embodiment the outer surface of the first inner wedge element and / or the outer surface of the second inner wedge element is formed as a partial surface of a cone whose longitudinal axis passes through the mounting position of the pressure sensor. For the tilting moments generated during preloading, it is important with which precision the geometries of the mutually facing surfaces of individual, relatively moving surfaces can be produced. It has been found that the production of tapered surfaces, for example, by rotating, machining a semi-finished can be made more accurate than the flat surface of a flat wedge. Due to this special design of the outer surfaces therefore a further reduction of the occurring tilting moments is achieved.

For the same reason, the inner surface of the first outer wedge element and / or the inner surface of the second outer wedge element are preferably formed as a partial surface of the boundary of a conical recess whose longitudinal axis extends through the installation position of the pressure sensor.

In a preferred embodiment, the first inner wedge element and the second inner wedge element are sub-elements of an integrally produced inner sleeve. This offers advantages both with regard to the manufacture of the components of the holder and with regard to the handling of the holder when installing the pressure sensor.

In a preferred embodiment, the inner sleeve between the first inner wedge member and the second inner wedge member has a longitudinal slot which is substantially perpendicular to the effective direction of the pressure force to be measured. As a result, the spring stiffness of the inner sleeve is reduced, so that the force shunt remains low. Furthermore, the inner sleeve may be formed with a small wall thickness. As a small wall thickness, with a conventional inner diameter of e.g. 20 mm to 50 mm, a wall thickness of e.g. 0.3 mm to 5 mm. The selected wall thickness of the sleeves can also be selected depending on the sleeve length, the displacement and the slope. It can also be 1/10 mm at the thinnest point. In particular, the longitudinal slot may be formed such that it has almost the entire longitudinal extent of the inner sleeve and remains only at one or both ends as a connection between the first inner wedge member and the second inner wedge member a narrow web. In a preferred embodiment, the inner sleeve has two longitudinal slots. Preferably, the or the longitudinal slots are provided in a plane extending through the installation position of the pressure sensor, arranged perpendicular to the direction of action of the pressure force to be measured.

As in the case of the inner wedge elements, in a preferred embodiment, alternatively or additionally, the first outer wedge element and the second outer wedge element can be partial elements or partial pieces of an outer sleeve produced in one piece. In a preferred embodiment, this outer sleeve can also have at least one longitudinal slot between the first outer wedge element and the second outer wedge element, which runs essentially perpendicular to the effective direction of the pressure force to be measured.

In a preferred embodiment, the inner surface of the first inner wedge member and / or the inner surface of the second inner wedge member are planar and arranged in a plane perpendicular to the effective direction of the pressure force to be measured. Such a configuration makes it possible to fit the pressure sensor, which is usually planar on its upper side and underside, directly against the inner surfaces, between the inner wedge elements.

Alternatively, in a further embodiment of the invention between the first inner wedge member and the installation position of the pressure sensor, a first intermediate piece with a dome and / or between the second inner wedge member and the installation position of the pressure sensor, a second intermediate piece may be provided with a dome, wherein the dome of the one Inner surface of an inner wedge element facing surface forms and the corresponding inner surface of the inner wedge member is formed correspondingly. The dome preferably has the geometric shape of a partial surface of a cylindrical body.

In a preferred embodiment of the invention, the outer surface of the first and / or the second outer wedge member is a partial surface of a cylindrical body. This embodiment is particularly recommended in application areas in which the pressure sensor is to be held by means of the holder in a bore, for example, the axial bore of a measuring roller.

The holder may have centering pins which engage in centering holes in components. By means of these centering individual, loose components, such as the pressure sensor, in relation to other components, such as the inner wedge elements and the inner sleeve, are well and accurately positioned.

In a preferred embodiment, the holder has an internal thread introduced into the first and second outer wedge elements, the longitudinal axis of which runs through the installation position of the pressure sensor and a pressure screw screwed into the inner thread, which can come into contact with the first inner wedge element and the second inner wedge element and relatively to the first and second outer wedge members. By this pressure screw, a simple biasing of the holder can be generated. Due to the angled configuration of the respective outer surfaces relative to the respective inner surfaces of the cooperating inner wedge and outer wedge elements, displacement of the wedge elements relative to one another produces displacement of the outer wedge member away from the mounting position of the pressure sensor. In this way, the holder can be clamped in a recess.

Alternatively, the holder may have an inner thread introduced into the first and the second inner wedge element, the longitudinal axis of which runs through the installation position of the pressure sensor and a lag screw which is screwed into the inner thread and can come into contact with the first and the second outer wedge element with its screw head and they can move relative to the first and the second inner wedge element.

In a preferred embodiment, the measuring roller has an installation arranged in the recess having the sensor or another recess, wherein the installation is made in one piece and the first temperature sensor and / or the second temperature sensor is arranged on the installation such that it determines the surface temperature of a surface section of the installation, or the installation is designed in several parts, for example, as in the above-described holder and the first temperature sensor and / or the second temperature sensor is arranged on a part of the installation, that it the surface temperature of a Surface section of this part can measure or is part of the installation and thus located inside the installation.

The inventive method for determining flatness deviations of a strip-shaped Guts is performed with the measuring roller according to the invention, wherein the measuring roller has at least a first arranged in a first recess first sensor and a second arranged in a second recess second sensor and the first recess and the second recess in Circumferential direction of the measuring roller are arranged at different locations, wherein the first sensor can generate a dependent of a force applied to the outer surface of the measuring roller force dependent first measuring signal and the second sensor can generate a dependent of a force applied to the outer surface of the measuring roller force dependent second measuring signal, wherein the strip-shaped material is guided over the outer circumference of the measuring roller and thereby touches at least a part of the surface of the measuring roller. In this method according to the invention, a difference signal is generated from a first temperature signal generated by the first temperature sensor and a second temperature signal generated by the second temperature sensor, and a corrected first measurement signal is generated from a first measurement signal generated by the first sensor and the difference signal into an evaluation unit.

In particular, it has been found in studies that in embodiments in which the sensor, which can produce a dependent of a force applied to the outer surface of the measuring roller force dependent measurement signal and which is arranged in the preferred embodiment under bias in the recess, a change in the bias of the Detect sensor when a first homogeneously tempered measuring roller receives a temperature profile in its interior due to acting on them heat and / or cold sources. Such a temperature profile can arise, for example, when a hot metal strip contacts the measuring roller in an upper surface area of the measuring roller and the measuring roller is cooled from below with ambient air or even with cooling water. Per unit of time, then, a part of the measuring roller located near the hot metal band is hotter than a part of the measuring roller close to the cooling, even if due to the rotating movement of the measuring roller the part of the measuring roll located in the vicinity of the hot band Measuring roller is located at a later time near the cooling and cooled. Both the existence of the temperature profile per unit time as such, but also the regular change in the temperature of the respective part of the measuring roller, caused by the rotational movement of the measuring roller and the alternating arrangement of individual sections of the measuring roller times near the hot band and sometimes in the vicinity of the cooling , may affect the quality of the measurement signal generated by the sensor as a function of the applied force. Have investigations In particular, it is shown that there is a nearly linear dependency ratio between the heating of the roller jacket and the reduction of the sensor bias voltage.

Fig. 1

einen Querschnitt durch eine Halterung mit einem Drucksensor in der Einbausituation in einer ausschnittweise dargestellten Messrolle in einer geschnittenen Seitenansicht gemäß der Schnittlinie B-B in Fig. 2;

Fig. 2

die Elemente der Fig. 1 in einer Ansicht entlang der Schnittlinie A-A in Fig. 1;

Fig. 3

die Elemente der Fig. 1 und 2 in einer Ansicht gemäß der Schnittlinie C-C der Fig. 2;

Fig. 4

eine alternative Bauform der Halterung in einer zur Fig. 2 vergleichbaren Darstellung;

Fig. 5

eine weitere Bauform der Halterung in einer zu der Fig. 1 vergleichbaren Darstellung;

Fig. 6

die Elemente der Fig. 5 in einer Ansicht entlang der Schnittlinie A-A der Fig. 5;

Fig. 7

die Elemente der Fig. 5 und 6 in einer Ansicht entlang der Schnittlinie C-C in Fig. 6

Fig. 8

eine weitere Bauform der Halterung in einer der Fig. 1 und 5 vergleichbaren Ansicht,

Fig. 9

eine weitere Bauform in einer Messrolle in einer teilweise geschnittenen Seitenansicht und

Fig. 10

eine mögliche Detaillösung der in Fig. 9 dargestellten Bauform.

In a preferred embodiment, the measuring roller according to the invention or the method according to the invention is used to detect flatness deviations of a metal strip. The measuring roll or the method according to the invention for determining flatness deviations of a metal strip which at the time of measuring a surface temperature of more than the prevailing room temperature, particularly preferably more than 50 ° C. and more preferably more than 300 ° C., is particularly preferably used having.

Fig. 1

a cross section through a holder with a pressure sensor in the installation situation in a partially illustrated measuring roller in a sectional side view along the section line BB in Fig. 2 ;

Fig. 2

the elements of Fig. 1 in a view along the section line AA in Fig. 1 ;

Fig. 3

the elements of Fig. 1 and 2 in a view along the section line CC of Fig. 2 ;

Fig. 4

an alternative design of the holder in a for Fig. 2 comparable representation;

Fig. 5

Another design of the holder in one of the Fig. 1 comparable representation;

Fig. 6

the elements of Fig. 5 in a view along the section line AA of Fig. 5 ;

Fig. 7

the elements of FIGS. 5 and 6 in a view along the section line CC in Fig. 6

Fig. 8

Another design of the holder in one of Fig. 1 and 5 comparable view,

Fig. 9

another design in a measuring roll in a partially sectioned side view and

Fig. 10

a possible detailed solution of in Fig. 9 illustrated design.

Fig. 1 shows a holder 1 for a pressure sensor 2. The holder 1 holds the pressure sensor 2 in an axial bore 3 of the partially illustrated measuring roller 4. Die Bracket 1 has an inner sleeve 5 which comprises a first inner wedge element 6 arranged above the installation position provided for the pressure sensor 2 with an inner surface 7 facing the installation position of the pressure sensor 2 and an outer surface 8 opposite the inner surface 7 at an angle to the inner surface 7 , Furthermore, the inner sleeve 5 has a second inner wedge element 9 arranged below the installation position provided for the pressure sensor 2, which has an inner surface 10 pointing to the installation position of the pressure sensor 2 and an outer surface 11 standing at an angle to the inner surface 10 and facing the inner surface 10.

Furthermore, the holder 1 has an outer sleeve 12. The outer sleeve 12 has a first outer wedge element 13 with an inner surface 14 facing the installation position of the pressure sensor and an outer surface 15 which is at an angle to the inner surface 14 and faces the inner surface 14. Furthermore, the outer sleeve 12 has a second outer wedge element 16 with an inner surface 17 facing the installation position of the pressure sensor 2, with which the outer wedge element 16 rests on the outer surface of the second inner wedge element 9. Furthermore, the outer wedge element 16 has an outer surface 18 lying opposite the inner surface 17.

A pressure screw 19 with an external thread is screwed into a female thread 20 introduced into the outer sleeve. The depth of engagement of the pressure screw 19 determines the relative position of the inner sleeve 5 in relation to the outer sleeve 12 and thus the degree of bias of the holder 1 in the axial bore third

Again Fig. 2 can be seen, the inner sleeve 5 and the outer sleeve 12, slots 21 and 22 respectively. These longitudinal slots 21, 22 reduce the spring stiffness of the inner sleeve 5 and the outer sleeve 12 and ensure that the force shunt remains low. The acting in the direction of action of the arrow D, to be determined pressure force is therefore well introduced into the pressure sensor 2. The outer sleeve 12 and the inner sleeve 5 can be produced by machining in a first processing step. As a result, in particular the shape tolerance of the inner surfaces 14, 17 of the outer sleeve 12 and the outer surfaces 8, 11 of the inner sleeve can be made particularly precise and so a tilting torque-free movement of the inner sleeve 5 are made possible relative to the outer sleeve 12. In subsequent processing steps, those in the view of the Fig. 2 laterally arranged portions of the inner sleeve 5 are further narrowed to reduce the lateral wall thickness of the inner sleeve 5. This results in the view of Fig. 2 lateral free spaces 23, 24 between the inner sleeve 5 and the outer sleeve 12, which favor the introduction of force into the pressure sensor 2 and further reduce the force shunt.

The Fig. 3 shows the top view of the pressure sensor 2. In this view, the leading to the pressure sensor 2 cable arrangement is clearly visible. A first cable 25 leads to the illustrated pressure sensor 2, while further cables 26 lead to further pressure sensors, not shown, which are arranged in the same axial bore 3.

The Fig. 1 to 3 show a first temperature sensor 40 installed in the first outer wedge member 13 and a second temperature sensor 41 installed in the second outer wedge member 16. The temperature sensors are mounted so that they can measure the surface temperature of the recess defining surface portions top and bottom.

The in the Fig. 4 shown further embodiment of the holder has basically the same structure as that in the Fig. 1 to 3 shown holder. Identical components have reference numbers increased by the value 100. However, a plurality of recesses 126 are provided in the inner sleeve 105 of this second embodiment, which further reduce the lateral wall thickness of the inner sleeve 105 and thus lead to a further lower spring stiffness and thus a lower force shunt. Also at the in Fig. 4 illustrated embodiment, a first temperature sensor 140 and a second temperature sensor 141 are provided.

In the Fig. 5 to 7 a further embodiment of the invention is shown which differs from that in the Fig. 1 to 3 Illustrated characterized differs that between the inner sleeve 205 and the pressure sensor 202 intermediate pieces 227 and 228 are provided with calottes. Moreover, the components shown correspond to the components of the Fig. 1 to 3 illustrated elements. They are represented by a reference number increased by 200. Also in the in the Fig. 5 to 7 illustrated embodiment, a first temperature sensor 240 and a second temperature sensor 241 are provided.

Fig. 8 shows one of the in Fig. 1 shown comparable bracket 301. It differs from the in Fig. 1 Shown by a different orientation of the inner surfaces 308, 311 and the corresponding outer surfaces 314, 317 and by a lag screw 329 which is screwed into an internal thread 330 of the inner sleeve 305. The depth of engagement of the lag screw 329 in the internal thread 330 determines the position of the inner sleeve 305 relative to the outer sleeve 312 and thus the bias of the holder 301 in the axial bore 303 of the measuring roller 304. The same components are marked with a value increased by the reference numeral 300. Also at the in Fig. 8 illustrated embodiment, a first temperature sensor 340 and a second temperature sensor 341 are provided.

At the in Fig. 9 In the illustrated embodiment, the measuring roller 401 has a pin 402. The measuring roller 401 has a metal shell 444 shrunk onto the roller body and axially parallel bores 403 arranged closely beneath it, from which transverse ducts 404 extend close to their end face and lead to a central cable duct 405. The holes are closed with a cover 406 or individually with lids and contain sensors 407, of which a cable 408 through the bore 403, the transverse channel 404 and the central channel 405 are guided to the outside. The wedge 414 biases the sensor 407. In the Fig. 9 embodiment shown shows the possibility of arranging a first temperature sensor 440 at a first radial distance R1 to the longitudinal axis and the arrangement of a second temperature sensor 441 at a second, different from the first radial distance R1 distance R2 on the end face of the measuring roller.

As in Fig. 10 shown, the holes 403 may also be connected to a longitudinal groove 421, in which the lower part of a loose clamping wedge 414 is guided and the inclined surface cooperates with an inclined surface of a housing 423. During radial clamping of the housing 423 with the guided in the longitudinal groove 421 clamping wedge 414 ensures that the housing 423 can not rotate in the bore 403. In the illustrated measuring roller 401, the sensor 407 is arranged in a four-part housing 423 with opposite parallel clamping surfaces 424, 425 and two end plates 426, 427. The in Fig. 10 shown first temperature sensor 442 is disposed in a separate recess, while the second temperature sensor 443 is disposed in the bore 403.

Claims (8)

Measuring roller for detecting flatness deviations of a strip-shaped material, wherein the measuring roller has a longitudinal axis and at least one sensor arranged in a recess in the measuring roller, which can generate a dependent of a force applied to the outer surface of the measuring roller force measuring signal, characterized by a first temperature sensor, the is arranged at a first distance in the radial direction away from the longitudinal axis, and a second temperature sensor, which is arranged in a second, different from the first distance distance in the radial direction away from the longitudinal axis. Measuring roller according to claim 1, characterized by a substantially cylindrical, integral body, in which the recess is introduced. Measuring roller according to one of claims 1 or 2, characterized in that the first and / or the second temperature sensor is a resistance thermometer (PT 100 sensors) or a thermocouple. Measuring roller according to one of claims 1 to 3, characterized in that the first temperature sensor and the second temperature sensor are arranged substantially in a same plane to which the longitudinal axis forms a normal. Measuring roller according to claim 4, characterized in that the first temperature sensor and the second temperature sensor are arranged substantially on a line pointing from the longitudinal axis in the radial direction of the measuring roller line. Measuring roller according to one of claims 1 to 5, characterized by an in the sensor having recess or another recess arranged installation, wherein the installation is integrally formed and the first temperature sensor and / or the second temperature sensor is arranged on the installation, that he the surface temperature of a surface portion of the installation can measure, or the installation is made in several parts and the first temperature sensor and / or the second temperature sensor is arranged on a part of the installation, that it can measure the surface temperature of a surface portion of this part or is part of the installation and thus located inside the installation. Measuring roller according to one of claims 1 to 6, characterized in that the first and / or the second temperature sensor is arranged in a recess and is arranged so that it can measure the temperature of a recess defining surface portion. A method for determining flatness deviations of a strip-shaped material with a measuring roller according to one of claims 1 to 7, wherein the measuring roller has at least a first first sensor arranged in a first recess and a second second sensor arranged in a second sensor and the first recess and the second Recess in the circumferential direction of the measuring roller are arranged at different locations, wherein the first sensor can generate a dependent of a force introduced on the outer surface of the measuring roller force dependent first measuring signal and the second sensor can produce a dependent of a introduced on the outer surface of the measuring roller force second measuring signal, in which the band-shaped material is guided over the outer circumference of the measuring roller and thereby contacts at least part of the surface of the measuring roller, from a first temperature signal generated by the first temperature sensor and one from the second temperature sensor A second difference signal is generated at the second temperature signal and a corrected first measurement signal is generated from a first measurement signal generated by the first sensor and the difference signal in an evaluation unit.

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