DE102014012426A1 - measuring roller - Google Patents

Abstract

The invention relates to a measuring roller for detecting deviations in planarity when treating strip-shaped material, in particular metal strip, with a roller body and the roller body at least partially surrounding the casing tube and arranged in recesses sensors, wherein the recesses in the axial direction of the measuring roller in the roller body and / or extend into the casing tube, wherein the recesses in the axial direction at both ends - by a web of the roller body and / or a web of the casing tube and / or - by a front side of the measuring roller forming lid, which also provided on this end pin of the measuring roller is limited.

Description

The invention relates to a measuring roller for determining flatness deviations in the treatment of strip-shaped material.

Measuring rollers are used for cold and hot rolling of metal strip and are for example from the DE 42 36 657 A1 known.

For the conventional measurement of the flatness in the rolling of belts, methods are essentially used in which the belt is guided with a certain wrap angle over a measuring roller equipped with sensors.

This is what happens in the DE 42 36 657 A1 described measuring roller to a contact between force transducers or their covers, which are arranged in open to the roller surface radial bores of the measuring roller, and the band. Between the spanned at the bottom of their recess sensors and the surrounding bore wall is a cylindrical gap. This gap can be sealed with an O-ring shoulder sealing or with a plastic layer front sealing to prevent the ingress of dirt, such as belt abrasion and lubricant in the annular gap between the sensor and the roll body. Also it is possible, as in the DE 42 36 657 A1 in the 1c is shown to place the encoder in a recess of the full roll, which is then covered with an attached membrane.

The arrangement of the sensors (load cell) with distance from the surrounding wall and the closing of the annular gap by means of an O-ring or a sufficiently elastic plastic ( DE 196 16 980 A1 prevents effective lateral forces during rolling in the body of the roller interfere with the force transducer or the measurement result. Such disturbing forces are the result of the strip tension acting on the measuring roller and an associated bending of the roller. Their cross section assumes the shape of an ellipse whose longer axis is parallel to the band. The roller deflection simulates the force transducer an unevenness of the tape when it is transmitted by force shunt on the encoder. Such a force bypass can not be completely avoided when using a seal in the annular gap, since the sealing forces inevitably act on the sensor.

Out DE 102 07 501 C1 is a full role for determining flatness deviations in the treatment of band-shaped Good, in particular of metal strip, known with sensors arranged in recesses, in which the sensors are axially accessible. The introduction of the axially extending recesses is often carried out with deep hole drilling tools. For measuring rolls with bale widths> 1000 mm, very long drilling tools must be used, as the drilling tool must first be run over the sometimes very long spigots for the frontal drilling of the recess. Bleeding of the drilling channel is often the cause.

Out DE 20 2007 001 066 U1 is a measuring roller for detecting flatness deviations in the treatment of band-shaped Good, in particular of metal strip, with a roller body and the roller body at least partially surrounding casing tube and arranged in recesses sensors known, wherein the recesses of a front side of the measuring roller in the roller body and / or extends into the casing pipe. The recess can be closed at the front with a lid. The each end provided pins of this measuring roller are formed on the roller body. A disadvantage of this measuring roller is the weakening of the roller body, or of the jacket tube through the introduced recesses. In the case of wide measuring rollers, driving over the bearing journal is also a great disadvantage, as in deep hole drilling. Another problem is the closing of the incorporated up to the front side channels / grooves, as these are not like the DE 102 07 501 C1 with drilling tools (round channels), but with milling tools (angular channels) are produced.

The invention is based on the problem to provide a measuring roller of the type mentioned with a long service life, which also provides accurate measurement results.

This object is solved by the subject matter of claims 1 and 2.

• – durch einen Steg des Rollenkörpers und/oder einen Steg des Mantelrohrs und/oder
• – durch einen die Stirnseite der Messrolle bildenden Deckel, der auch einen an dieser Stirnseite vorgesehenen Zapfen der Messrolle umfasst,

begrenzt. Der verbleibende Steg des Rollenkörpers, bzw. des Mantelrohrs, bzw. der den Zapfen umfassende Deckel geben der Messrolle zusätzliche Steifigkeit und reduzieren die Bereiche, in denen die Messrolle durch die Ausnehmungen geschwächt wird.The invention is according to a first aspect of the basic idea to perform the recesses for receiving the sensors only with a limited extent in the axial direction of the reel body. For this purpose, the recess in the axial direction at both ends

• - By a web of the roller body and / or a web of the jacket tube and / or
• By a cover which forms the end face of the measuring roller and which also comprises a journal of the measuring roller provided on this end face,

limited. The remaining web of the reel body, or of the jacket tube, or the cover comprising the pin give the measuring roller additional rigidity and reduce the areas in which the measuring roller is weakened by the recesses.

Although it is off DE 102 07 501 C1 Known to perform the executed there in the full roll recesses as blind holes and adjust the axial extent of the intended location for each sensor location. The blind holes according to DE 102 07 501 C1 however, weaken in their entirety the frontal area of the measuring roller. By according to the first aspect of the invention, the recesses are no longer guided to the front side, but are closed on both sides by a web or a cover which has the pin provided on this end face, the frontal region of the measuring roller is no longer weakened.

This advantage can also be realized by the second aspect of the invention, according to which the measuring roller has a roller body (thus a roller body which is not at least partially surrounded by a tubular casing) in the form of recesses in which sensors are arranged , Wherein the measuring roller has a front side of the measuring roller forming, connected to the full roll lid, which also includes a provided on this end pin of the measuring roller. In this embodiment, the support forces introduced via the pin are introduced via the connection between the cover and the full roll in the full roll.

In a preferred embodiment, the wall thickness of the web of the roller body, or the web of the casing tube in the axial direction at least 5 mm, more preferably more than 10 mm and most preferably more than 15 mm. The larger the wall thickness is selected in the axial direction, the larger the area of the end face of the measuring roller, which is not weakened by a recess.

In a preferred embodiment, the wall thickness of the lid forming the end face of the measuring roller in the region which does not have the pin, in the axial direction at least 5 mm, more preferably more than 10 mm and most preferably more than 15 mm. The larger the wall thickness is selected in the axial direction, the larger the area of the end face of the measuring roller, which is not weakened by a recess.

In a preferred embodiment, the cover is connected by means of connecting elements, in particular preferably by means of screws with the roller body.

The recesses may be bores or else channels produced, for example, by milling or sinking EDM, for example with a square cross section. The term bores therefore includes below all eligible cross sections and recesses, regardless of which concrete method they were generated. As bores are therefore also (in cross section, for example, in the radial direction, unilaterally open) channels and grooves (which are closed only by another component) and, for example, produced by actual drilling "holes" with a closed cross-section.

The recess (or as will be referred to hereafter: the hole) may be made, for example, by milling on the peripheral surface of the reel body. Thus, for example, a channel can be milled into the outer peripheral surface of the roller body, which is then closed by the drawn over the roller body casing tube at its first radially open side to form a completely closed cross-section recess. Likewise, the bore can be created by forming a channel in the inner surface of the jacket tube. When the jacket tube is applied to the reel body, this channel is also closed in the radial direction. Likewise, the bore can be produced by introducing channels into the outer surface of the roller body and into the inner surface of the jacket tube, wherein particularly preferably the jacket tube is then applied to the roller body such that the respective channels together form a bore, the bore thus in their lower part in the roller body and in its upper part in the casing pipe extends.

In a preferred embodiment, the sensors are keyed in the bore. As a result, they can be loaded in a particularly preferred embodiment with a predefined bias voltage. As a result of the wedging, they are not only fixed in their position within the bore, but can also be loaded with preloading forces. The loading with biasing forces is preferred because when using the measuring roller in normal operation, the installation conditions for the sensor under the various operating conditions, such. B. by changing temperature, can change. So z. B. by the influence of temperature, a different spatial extent of the jacket tube and the roller body, which can lead to a change in the installation situation, in particular the power coupling of the sensor. Therefore, it is preferred that the sensors are loaded during installation in the bores with a biasing force which is so high that in operation under all operating conditions, the power connection between the sensor and bore wall is maintained, so that a hysteresis-free and linear measurement is ensured.

The measuring roller has a roller body, which forms the main body of the measuring roller. Furthermore, in a first embodiment of the invention, a jacket tube is provided, which surrounds the roller body at least partially. Particularly preferably, the jacket tube is designed such that it completely surrounds the roller body, that is, completely covers the circumferential surface of the roller body and particularly preferably also a cover provided on the front side. However, it is also possible designs in which the roller body is only partially encompassed by the casing tube in relation to its longitudinal axial extent, that is, more or more depending on the application protrudes significantly beyond the casing tube. It is also conceivable that in embodiments which have a cover arranged on the front side, the cover projects beyond the jacket tube.

The recesses (bores) are particularly preferably designed paraxial. Although it is also conceivable that the recesses extend in a circumferential plane at an angle to the roller axis. However, axially parallel recesses can be produced more easily. The recesses in particular preferably have a greater extent in the axial direction than the sensors. Particularly preferably, the recesses have an extent in the axial direction, which corresponds to at least 1.1 times, more preferably at least 1.2 times and particularly preferably at least 1.5 times the extent of the sensor in this direction.

In a preferred embodiment, a plurality of sensors are arranged in a recess.

The sensors should be fixed in the holes, namely wedged, and preferably also be braced by the wedging. In a preferred embodiment, the wedging is performed such that a bias is applied to the sensor. This bias is particularly preferably chosen so that the power connection between the sensor and bore wall is maintained during operation under all operating conditions, so that a hysteresis-free and linear measurement is ensured.

If different preloads occur during clamping, they can easily be compensated by measurement. On the other hand, the bias can also be deliberately metered to compensate for manufacturing tolerances of both the sensors and the holes. In this case, sensors can be arranged with plane-parallel surfaces between wedge-shaped holding pieces, for example clamping wedges, which are moved against each other until the sensor is immovably clamped between the holding pieces.

One of the two holding pieces is normally located in the hole where the sensor is to be placed, while the other holding piece is displaced to fix the sensor in the hole. This can be done with the help of a clamping screw, which is supported on the roller body and acts via a spacer sleeve on the movable holding piece.

Particularly favorable is the arrangement of a plurality of sensors in radially movable sliding pieces, which are fixed by means of a wedge strip in the bore. The sliding pieces can be arranged in a spacer strip and pressed by means of wedge-shaped retaining lugs a clamping bar radially outward and clamped in the holes.

To safely accommodate the leads leading to the sensors, the bores may be connected to parallel ducts. Alternatively, however, the holes can also be connected via a transverse channel with a central cable bore in the role. The transverse channel can run in the body of the roll or be closed as an open channel on the end face of the roll and then with a lid.

In order to guide the holding pieces for the sensors or the strips in the holes, they can be provided with a longitudinal rib which engages in a complementary guide groove in the body of the roller.

If the jacket tube has a wall thickness of, for example, 1 to 30 mm, preferably 5 to 10 mm, the axially parallel bores are therefore arranged at a small distance below the roller surface, then results over the clamped sensors, a thin bending beam, which is the smaller its thickness the more favorable effect on the measurement result, because it absorbs virtually no or at most extremely low lateral forces.

In a preferred embodiment, the surface of the jacket tube has a coating with wear-resistant metallic or non-metallic or ceramic materials, for example with tungsten, molybdenum and tantalum and their alloys or with carbides, nitrides, borides, silicides and oxides. Furthermore, the outer surface or the coating can be provided with a texture in order to structure the surface of the web-like material guided over the roll.

The invention is based on the idea of holding the pressure sensor between two pairs of inner and outer wedge elements. This makes it possible, on the one hand, to align the sensor in the effective direction of the pressure force to be measured. Furthermore, it is possible by this arrangement, the holder with respect to a through the Installation position of the pressure sensor extending, arranged perpendicular to the effective direction of the pressure force to be measured arranged plane geometrically symmetrical form, possibly even axially symmetric. It has been recognized that tilting of the mounting elements occurs in the installation variant of the pressure sensor known from the prior art during clamping of the sensor, which leads to a reduction in the overall rigidity of the internals. The tilting takes place about an axis perpendicular to the longitudinal axis of the axial bore and the radial direction. This tilting is probably caused by the frictional forces occurring during bracing, which, however, are not balanced due to the asymmetric construction of the mainly used second installation variant and thus cause a tilting moment. It is also believed that the preload losses are due to tilting and skewing of the mounting elements during preloading. The elastic deformations and micro-movements caused by the alternating bending stress of the measuring roller also reduce the load asymmetry caused by the inclination of the internals and thereby cause the preload loss.

• – ein erstes oberhalb der für den Drucksensor vorgesehenen Einbauposition angeordnetes Innenkeilelement mit einer zu der Einbauposition des Drucksensors weisenden Innenfläche und einer im Winkel zur Innenfläche stehenden, der Innenfläche gegenüberliegenden Außenfläche, und
• – ein erstes Außenkeilelement mit einer zu der Einbauposition des Drucksensors weisenden Innenfläche, mit der das Außenkeilelement auf der Außenfläche des ersten Innenkeilelements aufliegt, sowie mit einer der Innenfläche gegenüberliegenden Außenfläche, und
• – ein zweites unterhalb der für den Drucksensor vorgesehenen Einbauposition angeordnetes Innenkeilelement mit einer zu der Einbauposition des Drucksensors weisenden Innenfläche und einer im Winkel zur Innenfläche stehenden, der Innenfläche gegenüberliegenden Außenfläche und
• – ein zweites Außenkeilelement mit einer zu der Einbauposition des Drucksensors weisenden Innenfläche, mit der das Außenkeilelement auf der Außenfläche des zweiten Innenkeilelements aufliegt, sowie mit einer der Innenfläche gegenüberliegenden Außenfläche.

The advantages of the invention are already achieved by a holder for a pressure sensor, which can measure a pressure force acting on it from above, comprising the following components:

• A first inner wedge element arranged above the installation position provided for the pressure sensor with an inner surface facing the installation position of the pressure sensor and an outer surface opposite the inner surface at an angle to the inner surface, 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 arranged below the installation position provided for the pressure sensor with an inner surface facing the installation position of the pressure sensor and an outer surface lying opposite the inner surface at an angle to the inner surface and
• A second 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 second inner wedge element, and with an outer surface opposite the inner surface.

In this way, the necessary for biasing the holder and the pressure sensor in a recess by a translational movement wedge assembly is moved into the interior of the holder. With regard to its outer surfaces, the holder can be adapted to the shape of the recess into which the holder and the pressure sensor are to be clamped, and at the same time allows the inner surfaces directly or indirectly influencing the installation orientation of the pressure sensor to be adapted to the desired orientation, for example these inner surfaces are vertical to arrange the direction of action of the pressure force to be measured. In addition, it has been found that in the holder according to the invention, the surface quality of the recess (for example, the axial bore), in which the holder is used, may be lower without tipping occurs. This eliminates complex procedures for producing a good surface quality, such as hoisting or rolling.

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 comparable components above the pressure sensor and below the pressure sensor do not move synchronously with one another. This can be avoided if the components in question are connected to each other. Preferably, however, this compound is designed such that it has a Displacement of the two connected components allowed 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 member and / or the inner surface of the second outer wedge member is preferably formed as a partial surface of the boundary of a conical recess whose longitudinal axis extends through the mounting 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 is at a conventional inner diameter of z. B. 20 mm to 50 mm a wall thickness of z. B. 0.3 mm to 5 mm understood. 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 element and / or the inner surface of the second inner wedge element is 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 associated 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, more than one type of sensor is provided in the measuring roller for measuring different mechanical forces. Thereby, the influence of the temperature can be detected, wherein the inventors have recognized that the influence of the temperature can be detected by a measurement of a present in the measuring roller mechanical force and then corrected accordingly. Accordingly, in addition to the usual measurement of a mechanical force, a second mechanical force is measured which makes it possible to draw conclusions about the influence of a temperature entry caused by the use of the measuring roller in the hot strip. The inventively designed measuring roller allows separation of the force generated by the thermal input into the reel body portion of the sum signal of the force transducer.

According to the invention, the term "type of sensor detects a sensor or measuring transmitter which enables the measurement of a physical quantity, in particular of a force, due to the utilization of a physical law or of a physical principle in a specific manner.

According to the invention, the term "different mechanical forces" comprises mechanical forces which differ, in particular, in their effective direction. For example, the different mechanical forces can be the radial force acting on the measuring roller in a section or (measuring) region and a force counteracting the radial force in the same section, the cause of which may be a thermal entry into the measuring roller.

Preferably, the sensors can be arranged distributed over the length of the measuring roller in order to determine the force in individual sections or area and to determine a possible distribution of the force acting on the measuring roller.

The inventors have found, according to a preferred embodiment, to be particularly useful when one type of sensors is a sensor for measuring the radial force, and one type of sensors is a sensor for measuring the biasing force of the sensor for measuring the radial force. Tried to have shown that a temperature change on the roller surface leads to such an elastic deformation of the measuring roller that the built under bias force usually provided sensors for measuring the radial force change their biasing force and thus their linearity. By the kind of the sensors for measuring the biasing force which differs from the first kind, which is applied to the sensors for measuring the radial force, it is possible to measure the influence of the thermal deformation of the roller body, and the proportion of the generated by the thermal deformation To separate the measuring signal of the sensor for measuring the radial force of the actual caused by the band-shaped Good radial force.

The inventors have further recognized first that with sensors of another type which measure a mechanical force, it is possible that in addition to the thermal deformation of the measuring roller, the the measurement result of the sensors of a first type influenced, a relative temperature distribution over the bandwidth can be determined when a plurality of sensors are arranged in the longitudinal direction of the measuring roller. For example, for the thermal input of 1 ° C., a value x can be measured in N, via which the temperature distribution can be determined by the relationship with the measured mechanical force.

Preferably, the forces introduced by the strip-like material under longitudinal tension are dynamically measured by one type of sensor and the forces occurring due to the deformation of the measuring roll as a consequence of a thermal entry are measured statically by another type of sensor. As a result, the respectively currently measured forces can be related to one another and the radial forces measured by the sensors of one type can be corrected by the thermal input or the thermal deformation.

In a preferred embodiment, the recesses are designed as bores whose longitudinal direction encloses an angle of less than 20 ° with the longitudinal axis of the measuring roller. In particular, the recesses may be configured as axially parallel bores extending from end face to end face, or are formed as blind holes. As a result, the sensors can then be placed from the front side in the holes with different depths, so that individual sensors can be staggered in adjacently located holes on a helix extending over the entire width of the roll. However, it is also possible to arrange a plurality of sensors in a bore at a distance from each other.

In particular, one type of sensor can be fixed or clamped in the bores, for example wedged. These biases are intentional and can be easily compensated metrologically. The bias voltage can be set with a predetermined value. For example, sensors can be arranged with plane-parallel surfaces between wedge-shaped holding pieces, for example clamping wedges, which are moved against each other until the sensor is immovably clamped between the holding pieces. Preferably, a sensor of the other type can be fixed or clamped together in a housing with the first type of sensor in the bores. The other type of sensor may for example also be fastened in a recess formed on one of the holding pieces or on one of the holding pieces with which the one type of sensor is braced in the bore.

One of the two holding pieces can, where the sensor is to be placed, be arranged stationarily in the bore, while the other holding piece is displaced for fixing the sensor in the bore. This can be z. B. done with the aid of a clamping screw, which is supported on the measuring roll body and acts via a spacer sleeve on the movable holding piece.

It is particularly preferred that the sensors of different types are arranged adjacent to each other in order to measure the direct influence by the thermal entry "on site" and to apply the influence on the signal of the other sensor as a correction.

In a preferred embodiment, a sensor of one type is arranged with a sensor of a further type in or on a housing or a holder, which simplifies handling during manufacture. The housing can be arranged in a recess of the measuring roller. For example, the sensor of one type can already be biased in the housing, wherein the sensor of the further type is arranged on the sensor of the first type and can measure the biasing force. It can be provided that the sensor of the first type is biased in the housing and / or with the housing, wherein the sensor of the further type determines the bias voltage to the housing, and thus the thermal input. The arrangement of the two types of sensors in or on a housing also ensures that the two types of sensors are arranged adjacent to one another in order to precisely take into account the influence that one type of sensor determines for the other type of sensor.

The term "housing" according to the invention also holders are detected, which have no closed design of a conventional housing. An inventive housing can in particular as in the DE 10 2006 003 792 A1 the disclosure of which is explicitly incorporated herein by reference, wherein the housing or holder is an inner sleeve having an outer peripheral cone in which a sensor for measuring the radial force (sensor of one type) is disposed, and one engaged with the inner sleeve having engageable or with this bracing an inner peripheral cone having outer sleeve. For example, a sensor for measuring one of the radial force counteracting mechanical force (sensor of another kind) on the inner sleeve or in a recess thereof may be arranged or fixed. For example, the sensor may be glued. A sensor for measuring a radial force counteracting mechanical force (sensor of another kind) can also be arranged on the outer sleeve or in a recess thereof. It is also possible for the sensor to be arranged for a mechanical force (sensor of another type) counteracting the radial force in a recess of the measuring roller in the area provided for the installation of the housing or the holder, without itself with the housing or the Holder to be connected.

In a preferred embodiment, the sensor of the other type is arranged such that it lies in the force flow of the force acting on the sensor of the first type. The arrangement should be in the power flow of a type of sensor.

In a preferred embodiment, one type of sensor is designed as a quartz sensor, wherein a quartz sensor is understood to be a piezoelectric element on the crystal surface of which the force to be measured generates charges which serve as a measured variable. Such sensors have a high sensitivity, a high natural frequency and stability with small dimensions and make it possible to compensate for initial loads without affecting the measurement result.

Preferably, a sensor of a (further) type is designed as a strain gauge, which can measure, for example, the biasing force of a quartz sensor, which can change during the deformation of the measuring roller as a result of a thermal entry into the measuring roller.

The invention will be explained in more detail with reference to exemplary embodiments illustrated in the drawing. In the drawing show:

1 the side view of a first embodiment of a measuring roller partially in section;

2 a sectional side view of a second embodiment of a measuring roller;

3 a sectional side view of a third embodiment of a measuring roller;

4 a sectional side view of a fourth embodiment of a measuring roller;

5 a perspective view of an embodiment of the measuring roller;

6 a measuring roller with cable channels in perspective view with the cover removed;

7 a section of an end view of the measuring roller according to 6 ;

8th a measuring roller with an axial bore with radially clamped sensor therein;

9 the perspective view of a measuring roller arranged along a helical staggered sensors with removed cover;

10 a measuring roller with two sensors facing each other;

11 a part of a roll with a sensor in a multi-part housing;

12 a plan view of the hole according to 11 ;

13 a spacer strip in conjunction with an associated wedge strip prior to bracing the sensors;

14 the two bars of the 13 with the strained sensors;

15 a measuring roll with the two strips in the situation according to 14 ;

16 a frontal plan view of a part of the roll according to 15 with a rectangular cross-section recess;

17 a cross-section through the holder according to the invention 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 18 ;

18 the elements of 17 in a view along the section line AA in 17 ;

19 the elements of 17 and 18 in a view along the section line CC of 18 ;

20 an alternative design of the holder according to the invention in a for 18 comparable representation;

21 another design of the holder according to the invention in one of the 17 comparable representation;

22 the elements of 21 in a view along the section line AA of 21 ;

23 the elements of 21 and 22 in a view along the section line CC in 22 ;

24 another design of the holder according to the invention in one of 17 and 21 comparable view;

25 a (partial) sectional view along a longitudinal direction of a measuring roller according to the invention with arranged in a recess sensors;

26 an isometric view of a measuring roller with sensors in a partially sectioned illustration with and lifted lid;

27 a detail view of in a recess of the measuring roller according to 26 arranged sensors; and

28 a detail view of in a recess of the measuring roller according to 26 arranged sensors of another embodiment.

The measuring roller according to the invention 1 according to the embodiments according to 1 and 2 has a lid 6 with a pin 2 and one in the embodiments according to 1 and 2 formed as a full role reel body 1b (Body) on. In the reel body 1b are axially parallel holes 3 arranged, of which close to their front side transverse channels 4 go off and to a centric cable channel 5 to lead. The holes are through the lid 6 closed and contain sensors 7 , each of which has a cable 8th through the hole 3 , the cross channel 4 and the centric channel 5 are led to the outside. The lid 6 is with the reel body 1b screwed. The embodiment according to 1 shows that per hole 3 a sensor 7 can be provided. The embodiment according to 2 shows that per hole 3 several sensors 7 can be provided.

The embodiment according to 3 shows that the measuring roller a roller body 1b with molded pin 2 can have. About the reel body 1b is a jacket pipe 1a postponed. The holes 3 be through a jetty 20 of the reel body 1b limited in the axial direction. The embodiment according to 3 shows that per hole 3 a sensor 7 can be provided or per hole 3 several sensors 7 can be provided. The embodiment according to 7 differs from the according to 3 in that a lid 6 is provided, on which the pin 2 is formed. The lid 6 is with the reel body 1b screwed.

5 shows a perspective view of one 4 comparable embodiment with lid 6 , Roll body 1b and casing pipe 1a , wherein, in contrast to the embodiment according to 4 in the embodiment according to 5 the jacket pipe 1a also the lid 6 surrounds.

The in the 6 and 7 schematically shown in perspective measuring roller 1 with removed (not shown lid) has parallel to each hole 3 opposing cable channels 10 . 11 for over the cross channel 4 and the centric channel 5 outgoing lines. The bore is here designed so that its lower portion in the reel body 1b and the upper area in the jacket tube 1a is trained.

At the in 8th shown measuring roller 1 are the sensors 7 in a hole 3 with a face plate 12 between a holding piece in the form of a stationary clamping wedge 13 and a slidable in the axial direction holding piece in the form of a loose wedge 14 arranged. At the Loskeil 14 there is a spacer sleeve 15 at. The clamping screw 16 is provided with an external thread in the internal thread 17 the stepped drilled hole 3 is screwed. Both the spacer sleeve and the clamping screw have a channel for cable entry 18 , With the help of one on the head 19 the clamping screw 16 attacking key can be the spacer sleeve 15 and the loskeil 14 deeper into the hole 3 move while the sensor 7 between the two wedges 13 . 14 radially clamp. As in 6 and 7 is at 8th the bore also designed so that its lower area in the reel body 1b and the upper area in the jacket tube 1a is trained.

The holes can, as in the 9 and 10 represented, from both end faces of the reel body 1b go out and as blind holes have a different depth. This causes the individual sensors along a helical line 20 , ie staggered and total the total width of the roll 1 to capture. The reel body 1b is frontally of the lid 6 covered, on which the pin 2 is trained.

The holes 3 can, as in the 11 . 12 shown, also with a longitudinal groove 21 be connected, in which the lower part 22 a loose clamping wedge 14 is guided and its inclined surface with an inclined surface of a housing 23 interacts. When radial distortion of the housing 23 with the in the longitudinal groove 21 guided clamping wedge 14 will ensure that the case 23 not in the hole 3 can twist.

At the in 13 to 15 shown measuring roller 1 is the sensor 7 in a four-part housing 23 with opposite parallel clamping surfaces 24 . 25 and two face plates 26 . 27 arranged.

The sensors 7 can also be used in radially movable sliding pieces 28 a spacer strip 29 be arranged with an axially parallel clamping bar in the form of a wedge strip 30 for radial clamping of the sliding pieces 28 interacts like that in the 13 to 15 is shown. While the spacer bar 29 in her hole 3 Fixed, the wedges are designed to work with their wedge surfaces 31 in cooperation with complementary inclined surfaces 32 the sliding pieces 28 to move radially outward and in this way the sliding pieces 28 with the immovably arranged therein sensors 7 and their lid 33 to clamp radially. The lid 33 is in a hole 34 of the sliding piece 28 guided without wall contact and has on its underside a recess, not shown, which receives the cable connection of the sensor.

In 16 is a measuring roll 1 with a rectangular cross-section longitudinal recess 35 shown with side slits 36 is provided. These slots serve to be above the longitudinal recess 35 widening for a sensor resulting bending beam to improve the elastic behavior of the bending beam. The slots can also serve as a guide for longitudinal ribs 37 on wedge bars 30 serve on the sensor, on holding pieces or on spacer or clamping strips and / or they can also serve as cable channels.

17 shows a holder 101 for a pressure sensor 102 , The holder 101 Holds the pressure sensor 102 in an axial bore 103 the partially illustrated measuring roller 104 , The holder 101 has an inner sleeve 105 on top of that one above the one for the pressure sensor 102 intended installation position arranged inner wedge element 106 with a to the installation position of the pressure sensor 102 facing inner surface 107 and one at an angle to the inner surface 107 standing, the inner surface 107 opposite outer surface 108 on. Furthermore, the inner sleeve 105 a second below that for the pressure sensor 102 intended installation position arranged inner wedge element 109 on, the one to the installation position of the pressure sensor 102 facing inner surface 110 and one at an angle to the inner surface 110 standing, the inner surface 110 opposite outer surface 111 having.

Furthermore, the holder has 101 an outer sleeve 112 on. The outer sleeve 112 has a first outer wedge element 113 with an inner surface facing the installation position of the pressure sensor 114 and one at an angle to the inner surface 114 standing, the inner surface 114 opposite outer surface 115 on. Furthermore, the outer sleeve 112 a second outer wedge element 116 with an installation position of the pressure sensor 102 facing inner surface 117 with which the outer wedge element 116 on the outer surface of the second inner wedge member 109 rests on. Furthermore, the outer wedge element 116 one of the inner surface 117 opposite outer surface 118 on.

A pressure screw 119 with an external thread is in a introduced into the outer sleeve internal thread 120 screwed. The screw-in depth of the pressure screw 119 determines the relative position of the inner sleeve 105 in relation to the outer sleeve 112 and thus the degree of bias of the holder 101 in the axial bore 103 ,

Again 18 it can be seen, have the inner sleeve 105 and the outer sleeve 112 , Slits 121 respectively 122 on. These longitudinal slots 121 . 122 reduce the spring stiffness of the inner sleeve 105 or the outer sleeve 112 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 good in the pressure sensor 102 initiated. The outer sleeve 112 and the inner sleeve 105 can be produced by machining in a first processing step. As a result, in particular the shape tolerance of the inner surfaces 114 . 117 the outer sleeve 112 and the outer surfaces 108 . 111 the inner sleeve are made very precise and so a tilting torque-free movement of the inner sleeve 105 relative to the outer sleeve 112 be enabled. In subsequent processing steps, those in the view of the 18 laterally disposed portions of the inner sleeve 105 be further narrowed to the lateral wall thickness of the inner sleeve 105 to reduce. This results in the view of 18 lateral free spaces 123 . 124 between the inner sleeve 105 and the outer sleeve 112 introducing the force into the pressure sensor 102 favor and further reduce the power shortage.

The 19 shows the top view of the pressure sensor 102 , In this view, the one to the pressure sensor 102 to recognize leading cable arrangement well. A first cable 125 leads to the illustrated pressure sensor 102 while more cables 126 lead to other pressure sensors, not shown, in the same axial bore 103 are arranged.

The in the 20 shown further embodiment of the holder has basically the same structure as that in the 17 to 19 shown holder. Same components indicate the value 100 increased reference numerals. However, with the inner sleeve 205 this second embodiment, a plurality of recesses 226 provided, which is the lateral wall thickness of the inner sleeve 205 further reduce and thus lead to a new lower spring stiffness and thus a lower force shunt.

In the 21 to 23 a further embodiment of the invention is shown which differs from that in the 17 to 19 Illustrated thereby distinguishes that between the inner sleeve 305 and the pressure sensor 302 spacers 327 and 328 provided with calottes. Moreover, the components shown correspond to the components of the 17 to 19 illustrated elements. You will be using one for the value 200 represented increased reference numerals.

24 shows one of the in 17 illustrated comparable bracket 401 , It is different from the one in 17 Illustrated by a different orientation of the inner surfaces 408 . 411 and the corresponding outer surfaces 414 . 317 and by a lag screw 429 in an internal thread 430 the inner sleeve 405 is screwed. The screw-in depth of the lag screw 429 in the internal thread 430 determines the position of the inner sleeve 405 relative to the outer sleeve 412 and thus the bias of the holder 401 in the axial bore 403 the measuring roller 404 , Same components to the in 17 to 19 Elements shown are with a value around 300 increased reference number marked.

This in 25 illustrated embodiment of a measuring roller according to the invention 1 with a lid 6 and cones formed thereon 2 has close to their surface arranged axially parallel recesses 3 on. In the in 25 illustrated embodiment, the recesses 3 arranged in a circle (see also 26 ).

In 25 is shown that of the paraxial recesses 3 close to their front side cross channels 4 are provided, leading to a centric cable channel 5 to lead. The paraxial recesses 3 are also through the lid 6 locked. In the recesses 3 are each at least two sensors 7a . 7b arranged, of which a cable 8th through the recess 3 , the cross channel 4 and the centric cable channel 5 are led to the outside. The cable 8th can be designed as two cables insulated from each other cables, so that for each sensor 7a . 7b a line is present.

With the sensors 7a . 7b These are sensors that are designed to measure mechanical forces. The sensors 7a . 7b differ with regard to their type in that with both a mechanical force is measured, but different laws or a different physical principle is used. Further, by the sensors 7a . 7b different mechanical forces relative to the direction of the force measured. The sensors 7a . 7b are arranged adjacent to each other.

The recesses 3 can from both ends of the roller body designed as a full role 1b go out and as blind holes have a different depth. This results in the individual sensors arranged in pairs adjacent to each other 7a . 7b along a helical line 9 , ie staggered, are arranged and total across the width of the measuring roller 1 are arranged distributed. The sensors arranged in pairs 7a . 7b capture the entire width of the measuring roller 1 ,

27 shows a detail view of in a recess 103 the measuring roller 1 in a pair arranged sensors 102 . 102b , The housing 101 or the holder holds the sensor 102 a first type, which is designed to measure the radial force in the recess 103 the partially illustrated measuring roller 1 , The housing 101 has an inner sleeve 105 on top of that one above the one for the sensor 102 intended installation position arranged inner wedge element 106 with a to the installation position of the sensor 102 facing inner surface 107 and one at an angle to the inner surface 107 standing, the inner surface 107 opposite outer surface 108 on. Furthermore, the inner sleeve 105 a second below that for the sensor 102 intended installation position arranged 127 on, the one to the installation position of the sensor 102 facing inner surface 110 and one at an angle to the inner surface 110 standing, the inner surface 110 opposite outer surface 111 having.

Furthermore, the housing has 101 an outer sleeve 112 on, which is a first outer wedge element 113 with a to the installation position of the sensor 102 facing inner surface 114 and one at an angle to the inner surface 114 standing, the inner surface 114 opposite outer surface 115 on. Furthermore, the outer sleeve 112 a second outer wedge element 120 with a to the installation position of the sensor 102 facing inner surface 117 with which the outer wedge element 120 on the outer surface of the second inner wedge member 127 rests on. Furthermore, the outer wedge element 120 one of the inner surface 117 opposite outer surface 116 on.

A pressure screw 119 with an external thread is in a in the outer sleeve 112 screwed inserted internal thread. The screw-in depth of the pressure screw 119 determines the relative position of the inner sleeve 127 in relation to the outer sleeve 112 and thus the degree of bias of the housing 101 in the recess 103 , To determine the bias voltage is the sensor 102b in the inner sleeve 127 arranged in a recess thereof. With the sensor 102b the preload force can be measured.

The sensor 102 for measuring the radial force is biased, wherein the magnitude of the bias voltage by means of the sensor 102b can be determined. In a thermal entry in the treatment of, for example, metal strip during hot rolling Radial forces are introduced into the measuring roller by the deflection of the band under longitudinal tension 1 introduced the outer shell of the measuring roller 1 deform elastically. The "membrane-shaped" web formed above the recess 103 is thereby displaced in the radial direction, which is caused by the sensor 102 , which can be configured as a piezoelectric sensor, can be determined. Thermal stresses that arise due to a temperature gradient, generate at the circumferentially outwardly located web above the recess 103 also a change in direction in the radial direction, which is opposite to the radial force. This will be the measurement result of the sensor 102 changed, with the sensor 102b , which can be configured as a static measuring sensor, in particular as a strain gauge, the path change is detected by a change in the bias voltage. With the aid of the currently measured preload force, the radial force values of the sensors 102 Getting corrected.

The sensors are closely spaced from each other in pairs 102 . 102b be in the inner sleeve 127 and the outer sleeve 112 having housing 101 inserted and then into the recess 103 the measuring roller 1 positioned and braced in their position.

28 shows a detail view of in a recess 103 the measuring roller 1 arranged sensors 102 and 102b one to 27 different embodiment. The structure of the embodiment, as in 28 is shown essentially corresponds to the structure of in 27 shown embodiment. Only with regard to the arrangement and design of the sensors 102 and 102b differs the embodiment of the 28 from the sensors 102 and 102b of the 27 , The sensor 107a is designed as a piezo-electric sensor, wherein it builds slightly shorter than the sensor in the radial direction 102 of the 27 , As a sensor of a different kind is the sensor 107b provided, which is designed as a static measuring sensor, in particular as strain gauges.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4236657 A1 [0002, 0004, 0004]
• DE 19616980 A1 [0005]
• DE 10207501 C1 [0006, 0007, 0011, 0011]
• DE 202007001066 U1 [0007]
• DE 102006003792 A1 [0060]

Claims (13)

Measuring roller ( 1 ) for determining flatness deviations during the treatment of strip-shaped material, in particular of metal strip, with a roll body ( 1b ) and one the roller body ( 1b ) at least partially surrounding jacket tube ( 1a ) and in recesses ( 3 ) arranged sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 ), wherein the recesses ( 3 . 103 . 303 . 403 ) in the axial direction of the measuring roller ( 1 ) in the reel body ( 1b ) and / or in the jacket tube ( 1a ), characterized in that the recesses ( 3 . 103 . 303 . 403 ) in the axial direction at both ends - by a web ( 20 ) of the reel body ( 1b ) and / or a web of the jacket tube ( 1a ) and / or - by a the front side of the measuring roller ( 1 ) forming lid ( 6 ), which also has a pin provided on this end face ( 2 ) of the measuring roller ( 1 ) is limited. Measuring roller ( 1 ) for determining deviations in planarity during the treatment of strip-shaped material, in particular of metal strip, with a roller body designed as a full roll ( 1b ) and in recesses ( 3 . 103 . 303 . 403 ) arranged sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 ), characterized by a the front side of the measuring roller ( 1 ) forming, associated with the full roll lid ( 6 ), which also has a pin provided on this end face ( 2 ) of the measuring roller ( 1 ) having. Measuring roller according to claim 1 or 2, characterized in that the sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 ) in the recesses ( 3 . 103 . 303 . 403 ) and especially because the sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 )) are acted upon in the recesses with a biasing force. Measuring roller according to one of claims 1 to 3, characterized in that the sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 ) in axially parallel recesses ( 3 . 103 . 303 . 403 ) are arranged. Measuring roller according to claim 4, characterized in that the axially parallel recesses ( 3 . 103 . 303 . 403 ) have a different length. Measuring roller according to one of claims 1 to 5, characterized in that a plurality of sensors ( 7 . 7a . 7b . 102 . 102 . 102b . 302 . 402 ) in the recesses ( 3 . 103 . 303 . 403 ) are arranged. Measuring roller according to one of claims 1 to 6, characterized in that sensors ( 7 ) with plane-parallel surfaces between two holding pieces ( 13 . 14 ) are arranged. Measuring roller according to claim 7, characterized in that the plane-parallel surfaces of the sensors ( 7 ) parallel to the roller axis. Measuring roller according to one of claims 1 to 8, characterized in that the sensors ( 7 ) in radially movable sliding pieces ( 28 ) a spacer strip ( 29 ) and by means of a clamping bar ( 30 ) in the recess ( 3 ) are fixed. Measuring roller according to claim 9, characterized in that the spacer strip ( 29 ) and / or the clamping bar ( 30 ) with one in a complementary guide slot ( 36 ) engaging longitudinal rib ( 37 ) is provided. Measuring roller according to one of claims 1 to 10, characterized in that the recesses ( 3 ) with a parallel channel ( 10 . 11 ) are connected. Measuring roller according to one of claims 1 to 11, characterized in that the recesses ( 3 ) through a transverse channel ( 4 ) with a central cable bore ( 5 ) are connected. Measuring roller according to one of claims 1 to 12, characterized in that the sensors ( 7 ) in a multi-part housing ( 23 ) are arranged.

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