DE102014002001A1 - Measuring roller for measuring the strip tension and method for its production - Google Patents

Abstract

The invention relates to a measuring roller (M) for the location sensitive measurement of a strip tension over the bandwidth z. B. during rolling, stamping or winding of strip material made of metal, paper or plastic, characterized in that a continuous hollow cylinder (7), consisting of an inner sensor carrier (1) and a cohesively applied coat (2) with a closed and low-wear jacket surface, contains sensors (6) secured against loosening during operation (eg vibrations). Furthermore, the invention relates to a method for producing such a measuring roller.

Description

The invention relates to a measuring roller for measuring the strip tension according to the preamble of patent claim 1 and a method for producing the measuring roller according to the preamble of patent claim 6.

Such a measuring roller is for example off DE 92 18 981 known. In this case, the sensors are introduced into radial bores in a pattern distributed on the cylinder jacket surface of the measuring roller. To secure the sensors in the radial bores of the measuring roller and to close the holes screwed caps are provided. The annular gap on the cylinder surface requires a careful seal to avoid contamination. This succeeds only limited. The replacement of defective sensors is also associated with high costs.

In DE 196 16 980 A1 a measuring roller is described in which the annular gap is sealed with a plastic layer. The dirt can be deposited in the plastic.

Out EP 1 432 536 B1 various versions of the sensor cover and the sensor attachment are known, which serve to seal the mounting holes for the sensors in the measuring roller without an annular gap. The replacement of defective sensors is particularly complicated in such a measuring roller.

DE 102 07 501 C1 discloses a procedure that avoids the problem of annular gaps by using axially parallel bores or channels to accommodate the pressure sensors, just below the surface. However, the method is very uneconomical and the replacement of individual sensors is associated with high costs.

DE 198 38 457 A1 describes a measuring roller, in which a jacket tube is shrunk onto a base body, wherein the base body contains the radial bores with the sensors. Replacing defective sensors is particularly difficult with this measuring roller.

The object of the invention is to eliminate the disadvantages of the prior art and to enable a more economical method for the installation or replacement of the sensors in the measuring roller. In addition, the economic potential of such measuring rollers is to be improved by reducing weight.

This object is solved by the features of patent claim 1. Advantageous embodiments of the invention will become apparent from the features of claims 2 to 6.

According to the invention it is proposed that the component of the measuring roller, which contains the sensors and their attachment consists of a hollow cylinder. This hollow cylinder may be made of steel or light metal. Furthermore, the hollow cylinder made of fiber composite material, such as carbon fiber reinforced plastic or reinforced light metal. The hollow cylinder may be readily composed of metal and fiber composite material.

In this hollow cylinder, the sensors can be mounted from the inside by a positive and secured against loosening in operation attachment. This attachment can be released manually to replace a sensor. Such a sensor attachment may be, for example, a screw with a screw lock.

For sensor recording are corresponding recesses on the inside of the hollow cylinder. The recesses may be circular and may have a diameter, the z. B. between 10 and 50 mm. Their depth is between 0.5 and 10 mm smaller than the wall thickness of the hollow cylinder.

The recesses may contain threads or grooves. However, the threads can also be present, for example, in the form of pressed or glued threaded sleeves.

In each of these wells, for example, a radially pressure-sensitive sensor can be attached. The sensor is guided to the frictional connection with the cylinder jacket and secured in a form-fitting manner over the side surface of the recess. This can be done via a thread. When using bending or strain-sensitive sensors, these can also be connected to the side of the recess directly to the jacket cohesively.

Expediently, the distribution of the depressions and sensors in an arrangement takes place in such a way that imbalance, rigidity and rigidity of the measuring roller are avoided.

According to an advantageous embodiment of the invention, the distribution of the recesses and sensors takes place in such a way that in each measuring position the belt tension and the deflection of the measuring rollers can be detected simultaneously on the associated sections of the measuring roller.

Each sensor has a cable or plug which allows the sensors to be connected to an on-roll electronics for signal processing or signal transmission.

According to the invention, the following steps are proposed for producing such a measuring roller:
The first step is the production of a continuous hollow cylinder with appropriate geometry (diameter, wall thickness), which meets the requirements in terms of strength and rigidity for the measurement task. This first hollow cylinder may consist of metal or fiber composite material and is referred to below as a sensor carrier. At the planned sensor positions are holes in the sensor carrier. These can be circular holes with a diameter between 5 mm and 50 mm, which were introduced by drilling or milling. The holes can also be provided with threads.

Next, placeholders are inserted into the holes, so that the cylinder jacket surface of the sensor carrier is temporarily closed. The resulting annular gap on the cylinder surface can be between 0.01 and 0.2 mm. The placeholder used can be made of metal or plastic. The placeholder may also have an external thread, so that it can be easily screwed in the case of existing in the hole thread.

The placeholder can complete structurally compliant at least with the cylinder jacket surface. That is, it has the same curvature on the outside as the cylinder surface of the cylinder. An additional fixation of the placeholder and sealing of the annular gap can be done by a slight gluing or filling of the gap on the side of the cylinder jacket surface.

The fixation of the placeholder can also by a mechanical device such. B. a mandrel inside the hollow cylinder. Alternatively, placeholders can be used, which protrude beyond the cylinder jacket surface. These can after fixation by mechanical post-processing such. B. Abrasive or twisting structurally flush with the cylinder surface can be adjusted.

Side surface side of the placeholder can be provided with a release layer. This release layer may be a paint or a film.

To produce the centric and closed surface, an outer jacket is applied cohesively after inserting the adapted placeholder on the cylinder jacket surface of the sensor carrier. Conveniently, impregnated with resin or plastic continuous fibers are wound around the lateral surface of the sensor carrier until the desired wall thickness is reached. Alternatively, fiber composite prepregs may be wrapped around or wound around the sensor carrier until the desired thickness is achieved. The winding or the scrim is then cured. The curing is expediently carried out under elevated temperature and under application of pressure to the winding or the scrim.

To improve the concentricity, the resulting new lateral surface z. B. be easily machined by grinding or turning. Conveniently, the new lateral surface can be additionally coated with a low-wear protective layer. The coating material may be metal, ceramic, rubber or plastic. To expose the wells, the placeholders are removed again.

According to an advantageous embodiment threaded sleeves are introduced into the prefabricated recesses. The attachment can be done by screw and / or adhesive connection.

The sensors are screwed into the recess or into the threaded sleeves and secured. The sensors can expediently be adjusted and calibrated in the same work step.

The proposed arrangement is particularly robust. Defective sensors can be replaced with very little effort.

According to an advantageous embodiment, the inner cylinder made of carbon fiber composite material. As a result, the proposed arrangement is particularly easy.

According to a further particularly advantageous embodiment, the sensor is a pressure-sensitive piezoelectric sensor which has a frictional connection with the jacket of the hollow cylinder after installation.

With such a measuring roller, it is possible to monitor the strip tension distribution in rolling processes.

Advantageous embodiments of the invention will be explained in more detail with reference to the drawings. Show it:

1 A schematic sectional view of the roll without sensors,

2 a schematic sectional view of a placeholder,

3 a schematic sectional view of a threaded sleeve,

4 , a schematic axial sectional view of the measuring roller,

5 a schematic radial sectional view of the measuring roller,

6 a schematic sectional view of a section of the measuring roller.

In the 1 to 6 is with the reference numeral 1 respectively called the sensor carrier. This can be made for example of a carbon fiber reinforced plastic. With the reference number 2 is called the coat. It can also be made of carbon fiber reinforced plastic and applied by a winding process and subsequent curing. With the reference number 3 the depressions are referred to, which can be provided with a thread or a threaded sleeve. With reference number 4 are called the placeholders, which serve to close the holes, so that the subsequent lamination or winding process a surface-compliant closing of the holes succeed and no "troughs" remain. With the reference number 5 are the threaded sleeves designated, which can optionally be glued or screwed into the wells. With the reference number 6 are each designated the sensors. These are either screwed directly into the recesses or into the threaded sleeves. With the reference number 7 is called the hollow cylinder, which is composed of the sensor carrier and the jacket cohesively.

LIST OF REFERENCE NUMBERS

1

sensor support

2

coat

3

deepening

4

placeholder

5

threaded sleeve

6

sensor

7

hollow cylinder

M

measuring roller

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 9218981 [0002]
• DE 19616980 A1 [0003]
• EP 1432536 B1 [0004]
• DE 10207501 C1 [0005]
• DE 19838457 A1 [0006]

Claims (6)

Measuring roller (M) for location-sensitive measurement of a strip tension over the bandwidth z. B. when rolling, stamping or winding of strip material made of aluminum, steel, paper or plastic, characterized in that a continuous hollow cylinder ( 7 ), consisting of a sensor carrier ( 1 ) and a cohesively applied jacket ( 2 ) with closed and low-wear jacket surface, against loosening during operation (eg vibrations) secured sensors that can be installed and removed via the interior of the hollow cylinder and connect electrically, characterized in that the radially acting sensors ( 6 ) with the sensor carrier ( 1 ) a positive connection and by contact with the jacket ( 2 ) form a location-sensitive adhesion. Measuring roller according to claim 1, wherein in the hollow cylinder ( 7 ) Wells ( 3 ) and the sensors ( 6 ) into the depressions ( 3 ) threaded or threaded sleeves ( 5 ) he follows. Measuring roller according to one of the preceding claims, wherein the sheath ( 2 ) consists of a fiber composite material. Measuring roller according to one of the preceding claims, wherein the sheath ( 2 ) is provided with a wear protection layer. Measuring roller according to one of the preceding claims, wherein the sensor carrier ( 1 ) is made of metal or a fiber composite material. Method for producing a measuring roller according to one of the preceding claims, comprising the following steps: a. Production / provision of a circular hollow cylinder (sensor carrier) made of metal or fiber composite material with the required dimensions and radial holes in the cylinder jacket, which are to be distributed as the sensors are to be used later. b. (Alternative to h.) Inserting threads / threaded sleeves in the bore holes. c. Surface-compliant closing of the holes by inserting placeholders made of metal and / or plastic. d. Construction of the outer sheath made of fiber composite material around the sensor carrier in winding or prepreg technique and subsequent curing. e. Exposing the recesses for the sensors by removing the placeholders from the sensor carrier. f. Post-processing of the lateral surface by mechanical processing such. B. grinding or turning. G. Coating of the lateral surface with a wear-resistant protective layer of metal, ceramic, rubber or plastic. H. (Alternative to b) Inserting threads / threaded sleeves into the recesses. i. Screw in and secure the sensors via threaded sleeves. j. Adjustment and calibration of the sensors.

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