EP2150361B2 - System for changing a roller - Google Patents

Description

The invention relates to a system for changing a roller.

A generic system is eg from Document DE - A 101 385 88 known.

Roller changing systems today are required to replace rollers in a short time if they no longer meet the requirements placed on them. Especially in rolling mills, the need for roll changes is high.

Systems for changing a roll in an industrial plant, in particular in a rolling mill, are today often based on manual activities, e.g. Detecting the roll identifier and actions derived from it. However, such roll changing operations are highly error prone. In a rolling mill, for example, this can lead to rolls with "false" properties being used in a roll stand. This has a disadvantageous effect on the rolling stock rolled with it. It may come to the point that produced rolling stock is no longer usable and must be remelted in the steelworks again.

The object of the present invention is to provide a system with which the process reliability in rolling processes is increased.

The object is achieved by a system for changing a roller having the features of claim 1. By such a system for changing a roller errors in the roller replacement are avoided or found errors faster in a roll change already made. The reading of identity parameters makes it possible to uniquely identify rollers at any time, as well as to unambiguously determine their characteristics based on the identified identity. If appropriate, the properties of a roller can be deposited directly in the sensor arranged on the roller. Alternatively, the property of a roller can be determined by means of a database into which specific rollers are assigned specific properties.

By using a system for determining a parameter, it is possible to improve process monitoring for an industrial process, in particular a rolling process in a rolling mill. On the one hand, there is a contactless data transmission between the sensor and reading device, whereby the detection of parameters is made more flexible. On the other hand, operating state parameters of the roller can be detected and read out. The information about the roller is thus extended by current data associated with the operating state of the roller, which data can not be provided by RFID tags, for example. It is now not only information already stored in the sensor readable, but it is also the operating condition parameters of a roller detectable, which are variable depending on boundary conditions.

In the context of this application, identification parameters are understood to mean all information or data which are specifically stored on a sensor in order to be able to read them out later by means of a read-out device. In particular, the identification parameters include all deposited data which allow a unique identification of the roller on which the sensor is arranged. The identification parameters may include, for example, historical data of the roller, e.g. Date of manufacture of the roller, manufacturer of the roller, intended areas of use and / or life of the roller to be. Furthermore, operating parameters, for example the tolerance range of physical variables such as temperature, pressure, etc., are also to be regarded as the identification parameters for the roller. Identification parameters may be adjustable, i. Changeable stored in the sensor, or set, i. Once fixed and fixed in the sensor.

Operating state parameters are characterized by the fact that they reflect or mark the current operating state of a roller. An operating state is not stored in the sensor, but is first detected by the sensor, for example, by measurement or otherwise, such as calculation.

In the present invention, the detection of operating condition parameters is also possible under adverse conditions, such as high temperatures, such as encountered in industrial plants. These adverse conditions, however, do not cause the roll changing system to be prone to error. Rather, the roll change system is designed so robust that it works even under these adverse conditions. Such adverse conditions are particularly found in metalworking industries such as steel mills or rolling mills. For here, depending on the type and function of the roller and depending on the positioning of the sensor on the roller of a steel or rolling mill, operating temperatures of the sensor of over 200 °. Therefore, the sensor is preferably designed such that it is permanently operable in a temperature range of 150 ° C to 350 ° C or 200 ° C to 350 ° C. It is particularly advantageous if the sensor is configured in such a way that it is durable in a temperature range of 150.degree. C. to 1000.degree is operable. A permanent operation of conventional RFID sensors is not possible in this temperature range today.

Preferably, the rolls provided with the sensor are to be replaced frequently, for example because of wear, since under such circumstances the advantages of the invention stand out in particular. Because of the invention errors when changing rolls can be reduced in a required roll replacement, since the identity of the roller by means of the sensor is clearly and easily determined. Furthermore, operating state parameters can be particularly easily detected by the present invention during operation of the roller. This makes it possible to establish relationships between the behavior of the roller during operation, such as wear, and the operating state parameters. This can be used to improve or optimize the roll operation.

Industrial equipment is understood to mean any equipment intended for industrial production or industrial service. These may be, for example, industrial laundries, steel and rolling mills, chemical industrial plants, industrial plants of the basic industry, in particular industrial plants for the production of paper, or any other industrial facilities.

The readout device for contactless readout of the sensor may be mobile or stationary. In particular, the read-out device can be designed as a mobile hand-held device. This is particularly advantageous when e.g. Sensors on rollers in a roll grinding or roller bearings to be read by staff. Alternatively, the read-out device can be arranged on rollers of the industrial plant in such a way that the sensor can be read out without contact. In particular, the read-out device can be arranged to be movable relative to the sensor.

According to the readout device is thus arranged on the roll changing car. Since the rollers are placed in a roll change anyway usually on the roll changing car, there can be particularly easy identification of the rollers. Due to the arrangement of the read-out device on the roll change carriage, the read-out device can also be arranged protected if necessary. Furthermore, no additional mobile readout devices are required, which reduces the space requirement.

Advantageously, the roll changing carriage comprises a gripper carriage, on which the read-out device is arranged. The gripper carriage is used for introducing the roller into the rolling stand or for carrying out the roller from the rolling stand. When inserting and executing the gripper carriage is positioned relatively close to the roller. Therefore, by means of a read-out device arranged on the clamp carriage, the sensor can be read out easily and without errors. Therefore, particularly in the arrangement of the read-out device on the claw carriage electromagnetic waves can be used with short range for reading the sensor.

In a preferred embodiment of the invention, the sensor is arranged on an end face and / or on the bearing of the roller. The end face of the roller is exposed to relatively low stresses compared to the lateral surface of the roller. Furthermore, a sensor arranged on the front side or on the bearing of the roller is particularly easy to access even during operation of the roller. As a rule, the smallest disturbances occur here in the contactless readout of the sensor.

Preferably, the roll changing system comprises a data evaluation device, which read-out parameters of the rollers involved in the change can be fed. Each roller is uniquely identifiable by the readout device according to the invention by an identification parameter. This in turn makes it possible to assign unique properties to the identified roller via the data evaluation device, for example via a concordance list. In a preferred embodiment of the invention, the data evaluation device checks whether the roll introduced or to be introduced into a specific mill stand is to be operated on schedule with this particular mill stand, in particular as a function of a product to be produced. Therefore, information about rolling stands is also stored in the data evaluation device, in particular which rolls are to be operated in specific rolling stands, in particular with regard to a product to be produced. A roll changing car is usually associated with a specific rolling mill. If the identity of the roll and possibly the identity of the roll stand are determined by means of the read-out device arranged on the roll changing carriage, then it can be determined by means of the data evaluation device whether the roll and the roll stand should be operated together according to plan. Since in certain rolling stands only certain rollers may be operated in order not to change the properties of the product - the rolling stock, eg. Metal strip - undesirable manner, is checked by means of data evaluation, whether the roller mounted on the Walzenwechselwagen and provided for changing the corresponding roller Features. As a rule, a set of rolls, for example consisting of two work rolls, is exchanged simultaneously. If it is now determined by means of the data evaluation device that a roll is mounted on a roll stand assigned to a specific roll stand, which is not provided for the stand, the data evaluation device can issue a signal to a monitoring center. This can then take appropriate action. If necessary, the data evaluation device can fully automatically cause the identified roll with "false" properties on the particular roll change carriage to be exchanged for a roll with "correct" properties. So it can be a roller with appropriate Characteristics are provided for the roll changing car, possibly before a roll change takes place or before damage to the product occurs. The data evaluation unit is thus preferably designed at least for the management of the roll stock, in particular during roll change. The data evaluator automatically detects which rolls are being run from the mill stand and which rolls are being fed into the mill stand for operation. The data evaluation device thus assumes the loading and unloading of the rollers and thus the documentation of roll changes. In the data evaluation device is thus always deposited, which rolls are currently in operation. Optionally, the transport devices, such as cranes or roller conveyor wagons are provided with readout devices, so that a location tracking of running from the rolling mill rolls in the rolling mill is possible. Also, the location tracking of rolls can thus be done by the data evaluation.

In an advantageous embodiment of the invention, the operating state parameter can be detected by measurement. By measuring current operating state parameters of the roll, two principles of data acquisition are advantageously linked together. On the one hand, at least one operating state parameter can be read out from the sensor at any time technically. On the other hand, the roller is identifiable at any time on the basis of the stored identification parameters by means of the read-out device. For example, it is therefore possible to record measurement series for the operating state parameters specifically for certain rolls and, for example, to associate them with the product quality of a product in which the roll is / was involved. These findings can be used to improve the industrial process. In particular, the temperature of the roll, the state of vibration of the roll, i. Vibration frequency and / or vibration amplitude of the roller, the position of the roller or the humidity of the roller environment are detected by measurement. Particularly in the case of rolling stands, it is advantageous to arrange sensors on the roll stand, on the work roll and on the frame drives, which detect the oscillation state of the respective roll. By detecting the state of vibration of the respective rollers, it can be determined which roller has an exciter function for the resulting framework vibrations, which are disadvantageous in the production of metal products. Due to the rapid localization of the vibration exciter can be acted quickly to committees of the product, eg. Metal strip - caused by the skeletal vibrations - to keep as low as possible.

In a preferred embodiment of the invention, the sensor can be supplied with energy for operating the sensor by the read-out device. It is therefore not necessary to provide the sensor with a power source that ensures its operation. Rather, the sensor works only when the readout emits a signal to read the sensor. As a result, the sensor can also be made compact and have a low weight.

In a preferred embodiment of the invention, the readout of the sensor takes place by means of electromagnetic radiation. The use of electromagnetic radiation is based on well-established and proven technology and is therefore reliable and easy to handle. Preferably, a transmission power is provided for the read-out device, which is free from state approval procedures. In Europe, these are currently 100 mW (milliwatts). However, this may be subject to change. The data transmission preferably takes place in a frequency range from 2.4 GHz (gigahertz) to 2.4835 GHz, i. the ISM (Industrial, Scientific, Medical) area. In order to avoid interference with other wireless communication systems - such as WLAN-based systems - the readout device and / or the sensor may be designed such that the traffic between them operates only at a short distance, i. less than 1 meter, especially in a range of 30 cm to 80 cm. Furthermore, the read-out device may, for example, comprise a directional antenna which emits a signal for reading out the sensor substantially in its direction. In particular, energy can be supplied to an electrically passive sensor, advantageously by means of electromagnetic radiation or electromagnetic waves, for operation.

In a further advantageous embodiment of the invention, the sensor is designed such that a plurality of parameters can be detected together. Thus, for example, a plurality of identification parameters, a plurality of operating state parameters or a combination of identification parameters and operating state parameters are transmitted by a single signal response of a sensor. The signal response includes, for example, the detected operating state parameters and the identification parameters. In this case, the basis of the signal response is, for example, the signal corresponding to an identification parameter. The signal associated with the identification parameter is, for example, modified in a defined manner by the measurement process of an operating state parameter such that the change of the signal corresponding to the identification parameter reproduces the operating state parameter. As a result, the data transmission volume and thus the absolute error in the data transmission can be kept low.

In a preferred embodiment of the invention, the sensor is a surface acoustic wave sensor, having a receiving and transmitting unit, with a signal converter arranged on a piezoelectric crystal for the mutual conversion of surface waves and electrical signals and with at least one reflector for reflecting surface waves, educated. It is a particularly temperature-stable sensor, which up to 350 ° C, in a special embodiment - by use of heat-resistant ceramics - even up to 1000 ° C, operable. The receiving-transmitting unit is usually an antenna which receives signals, in particular electromagnetic waves, from the read-out device. These are converted into surface waves by the signal converter and the piezoelectric crystal. The surface waves propagate on the surface of the piezoelectric crystal. Further, at least one reflector for reflecting surface waves is arranged on the piezoelectric crystal. Preferably, a plurality of reflectors, for example two or three, are provided. It is also possible to provide up to 20 reflectors per surface wave sensor. The surface waves, which are generally partially reflected at the at least one reflector, travel back to the signal converter and are converted back into electromagnetic signals there. The electromagnetic signals obtained from the surface waves are then radiated via the antenna of the sensor and received by the read-out device. By suitable arrangement of the reflectors on the piezoelectric crystal, each sensor can be designed individually or uniquely in this way.

In an advantageous embodiment of the invention, the arrangement of the at least one reflector determines an identification parameter. By arranging the reflectors on the piezoelectric crystal, unique roll identification parameters can be provided for each sensor. The identity is provided by characteristic transit times or transit time differences of the signals between the signal converter and the at least one reflector. At least one identification parameter from the read-out identification parameters then makes it possible to unambiguously determine the identity of the roller from the read-out identification parameters. At the same time, however, the surface acoustic wave sensor also enables temperature measurement and vibration measurement, since the propagation time of the surface wave generated by the signal transducer is dependent on the temperature and the vibration state of the piezoelectric crystal. Thus, in such a sensor in addition to a unique roll identification parameter also detected by the sensor operating state parameters in the form of temperature and the vibration state can be read without additional effort.

In a preferred embodiment of the invention, a first roller has a first surface wave sensor and a second roller has a second surface acoustic wave sensor, wherein the reflectors of the first and second surface acoustic wave sensors are arranged such that, when the sensors are simultaneously read out, the signals which are associated with the read-out parameters of the first roller and the read-out parameters of the second roller, do not overlap in time. Thus, it is possible by means of a single readout device several, i. at least two, read sensors simultaneously while still assigning the signals clearly a respective sensor and thus the respective roller. As a result, the data transmission is further improved because the effort to read the sensors is reduced. This is particularly advantageous when reading out stored rollers, since here the time for detecting the mounted rollers in the roller bearing can be shortened.

In a further advantageous embodiment of the invention, a data processing device is provided, which read parameters can be fed. The data processing device is supplied with the read-out detected operating state parameters and the read-out identification parameters. As a result, a database is created, which can be accessed individually for control purposes, tax purposes or documentation purposes for each roller. The data processing device is preferably supplied with further operating state parameters of the roller that are not detected or detectable by the sensor, as well as a multiplicity of further variables influencing the process. Preferably, data about the production of the product or data about the product produced are also supplied to this data processing device. By determining relationships, for example in the form of a process model, between operating state parameters and product properties of the product produced, currently detected operating state parameters can be used to control, control or optimize the roll or roll operation. An optimization of a roll is preferably carried out offline from the process, for example, after changing or removing the roller. Control and / or control of the rolls due to the detected and read-out operating state parameters preferably occur during operation of the roll, i. on-line. Successively read operating state parameters in conjunction with read identity parameters can, for example, be incorporated directly into a process model, and be used to control the roller manipulated variables. This can improve the product quality.

FIG 1

ein System zum Ermitteln von Parametern,

FIG 2

ein System zum Wechseln einer Walze,

FIG 3

eine Seitenansicht einer Walze mit Lager,

FIG 4

einen ersten Oberflächenwellensensor,

FIG 5

einen zweiten Oberflächenwellensensor.

Further advantages of the invention will become apparent from the drawings schematically illustrated embodiments, which are explained below with reference to the figures. Show it:

FIG. 1

a system for determining parameters,

FIG. 2

a system for changing a roller,

FIG. 3

a side view of a roller with bearings,

FIG. 4

a first surface acoustic wave sensor,

FIG. 5

a second surface wave sensor.

FIG. 1 shows a system 1 for determining parameters of different rolls B1, B2, B3 and B4 a rolling mill, wherein in FIG. 1 B1 and B4 are formed as back-up rolls with bearings 26 and B2 and B3 as work rolls with bearings 26. It is noted that the drive-side drive segments for driving the work rolls in FIG. 1 not shown, since these are not essential to the invention. The system 1 for determining parameters comprises an evaluation device 3, which has a read-out control unit 3 'and antennas 4 controlled by this read-out control unit 3'. Furthermore, the system 1 comprises sensors 2 arranged on the rollers B1, B2, B3 and B4 for determining parameters.

The sensors 2 are designed as surface acoustic wave sensors. In the surface acoustic wave sensors, one individual identification parameter is stored for each roller B1, B2, B3 and B4. This can be read out by means of the read-out device 3. In addition, with the respective sensors 2 operating state parameters, namely the temperature and the vibration state of the respective roller B1, B2, B3 and B4, detectable. The sensors 2 are arranged on the roller B1 at different locations. For easy identification of the Ba rollers B1, B2, B3 and B4, certain sensors 2 are arranged such that they can be addressed or read out particularly easily by the antennas 4. For this purpose, these particular sensors 2 are arranged on the bearing 26 of the working and support rollers or on "outside", in FIG. 1 not shown faces of the work rolls or backup rolls.

Furthermore, sensors 2 are arranged on the rollers B1, B2, B3 and B4 on an "inner" end face 25 of the respective support roller or work roll. These sensors 2 serve the temperature of the work rolls B2, B3 as close as possible to the surface interacting with the metal strip or in the case of the support rollers B1 and B4, the temperature of the support roller B1 and B4 as close as possible to the contact surface between work roll B2 and B3 and support roller B1 and B4 to capture.

In the FIG. 1 Sensors 2 shown are passive sensors, ie they do not have their own power supply. The sensors 2 are operated via the electromagnetic field emitted by the respective antenna 4. By the energy supplied to the sensors 2, the operating state parameters, temperature and / or vibration state, can be detected and are returned to the antenna 4 together with the stored identification parameter. From the antenna 4, the signals of the read-out control unit 3 'are supplied, which converts the signals supplied by the antenna 4 into identification parameters or operating state parameters.

The reading of the sensors 2 is preferably carried out continuously, that is, the operating state parameters of the rollers B1, B2, B3 and B4 are preferably detected at short intervals over a longer period of time. The read-out operating state parameters are assigned to the identification parameters in the read-out device 3, so that in a data processing device 12, a time profile of the operating state of a clearly identifiable by the identification parameter roller, for example, B1, is deposited.

Preferably, identification parameters and operating state parameters are read from a plurality of rolls of an industrial plant and supplied to the data processing device 12.

In addition, the data processing device 12 can be supplied with further information which was not determined by the system 1 for determining parameters. The data stored in the data processing device 12 then make it possible to establish relationships between different sizes of an industrial plant. For example, the wear of rolls may be determined depending on the operating condition parameters for each roll. From this determined relationship operating conditions of the roller can then be determined, which ensure a longer life of the roller. Also, the dependence of the product quality of the manufactured product, for example, a metal strip, which is manufactured by the working and support rollers, can be determined by the operating state parameters of the respective roller. This makes it possible to improve manufacturing processes in an industrial plant.

The system 1 for determining parameters is preferably connected to an automation system of an industrial plant. Preferably, the data in the data processing device 12 can also be queried by a control center and can be further processed, for example, displayed, among other things.

FIG. 2 shows a system 20 for changing a roll or rollers or for changing a set of rollers. The roll changing system 20 comprises a roll changing carriage 22 on which a roll or set of rolls is storable. In FIG. 2 a first work roll 21 and a second work roll 21 'are mounted on the roll change carriage 22. It is noted that the drive-side drive segments for driving the work rolls 21 and 21 'in FIG FIG. 2 not shown, since these are not essential to the invention. Together, the work roll 21 and the work roll 21 'form the set of rolls. These are to be introduced into an already prepared, that is freed of work rolls, not shown mill stand.

The system 20 for changing a roll or a roll set further comprises a gripper carriage 23, which is mounted displaceably on rolling elements 29, so that these rollers or a set of rolls can execute from a roll stand and can introduce rolls or a roll set into a rolling stand. For this purpose, the gripper carriage on two pliers 24, with which the work rolls 21 and 21 'are feasible. The work rolls 21 and 21 ', which form the roll set, each comprise two bearings 26.

At the bearings 26 of the respective work roll 21 and 21 ', a sensor 2 is arranged in each case. The sensors 2 are each designed to store identification parameters and to record operating state parameters. The sensors 2 are preferably arranged on those bearings 26 of the rollers 21 and 21 'which face the tong carriage 23. The gripper carriage 23 comprises a read-out device 3 for reading out the sensors 2. For this purpose, two antennas 4 are arranged on the gripper carriage 23, which lie opposite the respective sensor on the bearing 26 of the work roll 21 or 21 '. The antennas 4 are connected to a read-out control unit 3 'comprised by the read-out device 3, in which the signals read out from the sensor 2 are further processed. The roll change carriage 22 thus comprises a system 1 for determining parameters which characterize the identity and / or the operating state of a roll, provided that rolls with sensors 2 arranged thereon are mounted on the roll change carriage 22. The read-out parameters can be supplied to a data evaluation device 27 which automatically manages the roll change of rolls. By reading out the identification parameters in rolls to be executed from a roll stand and reading out the identification parameters of the rolls to be introduced into a roll stand, it can be automatically detected which rolls are currently located in a specific roll stand. Since each roll changing carriage 22 is assigned to a specific roll stand, there is generally no need for additional identification of the roll stand by a system 1 for determining parameters with knowledge of the respective roll change carriage. However, this can be additionally provided.

In the data evaluation device 27, a comparison of the identification parameters of rollers with concordance lists can also be carried out. By way of example, the lists of concordance specify what properties the work rolls or back-up rolls of a particular rolling mill may have in order to operate it in such a way that the product produced has properties which are within the intended specification. Likewise, properties for clearly identifiable rolls are stored in the concordance lists. It is now determined by means of the system 1 for determining parameters in the context of the system 20 for changing a roll or a roll set by comparison in the Konkordanzliste that a stored on the Walzenwechselwagen 22 roller or roller set does not have the properties that are required In order to operate the rolling stand error-free or to produce the product in the desired quality, it is preferable for the data evaluation device 27 to transmit a signal, in particular a warning signal, to a monitoring center 28. The monitoring center 28 is preferably the control center of the industrial plant. There, an exchange of the rollers mounted on the roll changing carriage 22 can then be initiated so that there is no interruption of production or damage to the product produced. Alternatively, a fully automatic replacement of the set of rolls on the roll changing carriage can be initiated by the data evaluation device 27.

FIG. 3 shows a side view of a roller 21 with a bearing 26. In particular FIG. 3 , which are exemplary ways to mount sensors 2 on the bearing 26 and on the roller 21. Parts of the roller 21 penetrate the bearing 26 and can serve to arrange the sensor 2 on an end face 25 of the roller 21. For a particularly good detection of the temperature of the roller 21, it is advantageous to arrange the sensor 2 as close as possible to the lateral surface of the roller 21 in contact with the rolling stock. This is in FIG. 3 illustrated by the fact that a sensor 2 is arranged on the arranged behind the bearing 26 end face 25 of the roller 21. In FIG. 3 These are merely exemplary exemplary embodiments that can be modified by the person skilled in the art within the scope of any embodiment of the read-out device 3 which reads out a sensor 2.

FIG. 4 shows a first surface acoustic wave sensor 2 and FIG. 5 shows a second surface acoustic wave sensor 2 '. The first surface acoustic wave sensor 2 and the second surface acoustic wave sensor 2 'are designed such that they can be arranged directly next to each other, even if they are read out at the same time. This is ensured by the fact that, when the sensors 2, 2 'are read out simultaneously, ie the sensors are read out, for example, by means of a single antenna 4, the signals associated with the identification parameters or the operating state parameters do not overlap in time. The surface sensors 2 and 2 'each have a receiving transmission unit in the form of sensor antennas 5. These sensor antennas 5 are in each case connected to a signal converter 7 in the case of both sensors 2 and 2 '. The signal converter 7 is in both cases a metallic finger structure which is suitable for converting the electromagnetic signals sent by the antenna of the read-out device and received by the sensor antennas 5 into surface waves. For this purpose, the signal converter 7 is arranged on a piezoelectric crystal 6. This first allows the electromagnetic signals received by the sensor antennas 5 to be converted into surface waves propagating on the surface of the crystal 6. The surface waves generated by the signal converter 7 propagate perpendicular to the fingers of the signal converter 7. The first surface acoustic wave sensor 2 in FIG. 4 has a first reflector 8 for reflecting surface waves and a second reflector 9 for reflecting surface waves. The reflectors 8 and 9 are arranged at a certain distance from the signal converter 7 and designed such that this from the signal converter 7 reflect in the direction of the reflectors 8 and 9 propagating surface waves at least partially. The reflectors 8 and 9 are arranged one behind the other. Due to the distance of the reflectors 8 and 9 from the signal converter 7 and the reflectors 8 and 9 to one another, the first surface acoustic wave sensor 2 has an identity parameter which can be unambiguously assigned to this sensor 2. The in FIG. 5 illustrated sensor 2 'differs from that in FIG. 4 shown sensor 2 only in that the arrangement of the reflectors 8 'and 9' on the piezoelectric crystal 6 relative to the signal converter 7 of the sensor 2 'from the arrangement of the reflectors 8 and 9 relative to the signal converter 7 of the sensor 2 are different. In particular, however, the reflectors 8, 9 and 8 ', 9' of the sensors 2 and 2 'are arranged such that with simultaneous reading of the sensors 2 and 2', the transit times of the surface waves from the signal converter 7 of the first sensor 2 to the reflector 8 and 9 and back to the signal converter 7 or from the signal converter 7 of the second sensor 2 'to the reflector 8' or 9 'and back are so different that the signals or the signal response of the first surface acoustic wave sensor 2 and the signals or do not overlap the signal response of the second surface acoustic wave sensor 2 '. Therefore, the sensors 2 and 2 'in the immediate vicinity of each other, for example. Same or different rollers are operated.

At the same time the effort to read the sensors is reduced. Since the transit time of the surface waves from the respective signal converter 7 to the reflectors 8, 9, 8 'and 9', respectively, is temperature-dependent and dependent on the vibrational state of the piezoelectric crystal, which is coupled directly to the roller, identification parameters and operating state parameters in the surface waves become -Sensors 2 and 2 'read together. By once calibrating the surface acoustic wave sensors 2 and 2 ', therefore, a detection of the temperature and the vibration state can be easily done. For detecting the state of vibration, an additional component based on a semiconductor material, which is designed to detect vibrations, can be provided. This is preferably connected to the surface acoustic wave sensor 2 or 2 ', and can advantageously be read together with it.

Claims (13)

1. System for changing a roller, having a roller changing carriage (22) on which a roller (21, 21') which can be inserted into a rolling stand or removed from the rolling stand can be mounted, characterized by a system (1) for determining parameters which characterize the identity and/or the operating state of a roller (21, 21') of an industrial installation, having at least one sensor (2, 2') which is arranged on the roller (B1, B2, B3, B4), is intended to store parameters and is configured in such a manner that a stored identity parameter of the roller (B1, B2, B3, B4) can be detected, and having a reading device (3), arranged on the roller changing carriage (22), which is designed to contactlessly read detected parameters from the sensor (2, 2'), the sensor (2, 2') also being configured to detect an operating state parameter of the roller (B1, B2, B3, B4) and being able to be operated at a roller temperature of at least 150°C, the sensor (2, 2') for storing and/or detecting parameters being arranged on the roller (21, 21').
2. System for changing a roller according to Claim 1,
   characterized in that the roller changing carriage (22) comprises a gripper carriage (23) on which the reading device (3) is arranged.
3. System for changing a roller according to Claim 1 or 2,
   characterized in that the sensor (2, 2') is arranged on an end face (25) of the roller (21, 21') or on the bearing (26) of the roller (21, 21').
4. System for changing a roller according to one of Claims 1 to 3,
   characterized by a data evaluation device (27) which can be supplied with read parameters of the rollers (21, 21') involved in the changing operation.
5. System for changing a roller according to Claim 4,
   characterized in that the data evaluation device (27) checks whether the roller (21, 21') which has been inserted or is to be inserted into a particular rolling stand can be operated as planned with this particular rolling stand, in particular on the basis of a product to be produced.
6. System for changing a roller according to one of Claims 1 to 5,
   characterized in that the operating state parameter can be detected by means of measurement.
7. System for changing a roller according to one of Claims 1 to 6,
   characterized in that an operating state parameter is the temperature of the roller (B1, B2, B3, B4).
8. System for changing a roller according to one of Claims 1 to 7,
   characterized in that an operating state parameter is an oscillation frequency and/or an oscillation amplitude of the roller (B1, B2, B3, B4).
9. System for changing a roller according to one of Claims 1 to 8,
   characterized in that the reading device (3) can supply energy for operating the sensor (2, 2') to the sensor (2, 2').
10. System for changing a roller according to one of Claims 1 to 9,
    characterized in that the reading operation is effected using electromagnetic radiation.
11. System for changing a roller according to one of Claims 1 to 10,
    characterized in that the sensor (2, 2') is designed in such a manner that a plurality of parameters can be detected together.
12. System for changing a roller according to Claim 11,
    characterized in that the arrangement of the at least one reflector (8, 9, 8', 9') determines an identification parameter.
13. System for changing a roller according to Claim 11 or 12,
    characterized in that a first roller has a first surface acoustic wave sensor (2) and a second roller has a second surface acoustic wave sensor (2'), the reflectors (8, 9, 8', 9') of the first and second surface acoustic wave sensors (2, 2') being arranged in such a manner that the signals which are associated with the read parameters of the first roller and the read parameters of the second roller do not overlap in terms of time when simultaneously reading the sensors (2, 2').

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