WO2012013759A2 - Dispositif de mesure et cage de laminoir ainsi que procédé d'exploitation des deux dispositifs - Google Patents
Dispositif de mesure et cage de laminoir ainsi que procédé d'exploitation des deux dispositifs Download PDFInfo
- Publication number
- WO2012013759A2 WO2012013759A2 PCT/EP2011/063052 EP2011063052W WO2012013759A2 WO 2012013759 A2 WO2012013759 A2 WO 2012013759A2 EP 2011063052 W EP2011063052 W EP 2011063052W WO 2012013759 A2 WO2012013759 A2 WO 2012013759A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- position sensor
- signal converter
- actuator
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/3473—Circular or rotary encoders
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
- H03M1/1076—Detection or location of converter hardware failure, e.g. power supply failure, open or short circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
Definitions
- the invention relates to a measuring device with a position sensor for generating a position encoder measuring signal, which represents the respective current position of an actuator, and a signal converter device for converting the position encoder measuring signal into a converter output measuring signal having a desired signal format.
- the signal converter device is further configured to perform an integrated first monitoring function by comparing the amplitude of the position encoder measuring signal with a predetermined amplitude threshold value.
- the invention relates to a corresponding measuring method, a roll stand with the said measuring device and a method for operating the roll stand.
- the rolling stands typically have two working rolls set against each other, which span a roll gap, for rolling the rolling stock.
- the rolling stands can also have support and intermediate rolls.
- the rolls are typically set or positioned by hydraulic cylinders as desired.
- the position of the adjusting cylinder or the rollers is typically detected and monitored by means of position encoders.
- position encoders typically magneto-magnetic, magnetoresistive, inductive or special sensors such as LVDT linear variable transformers have been used as locators.
- Other measuring principles, for example capacitive ones are virtually not used because either the required measuring range can not be covered or the measuring accuracy is insufficient or because these position encoders can cope with the difficult ambient conditions. conditions when used on rolling stands (for example, high temperature or high humidity) can not withstand.
- the position encoder measurement signal generated by the traditionally used position sensors is fed via a signal line to a signal converter which reads the position encoder measurement signal and converts it into a desired signal format, for example into a signal format suitable for a subsequent further processing. Finally, the converted signal is output via a further signal line to a control device, for example for the rolling stand.
- the traditional signal converter devices also perform various monitoring functions. These are, for example, monitoring the speed with which the position transmitter or an associated actuator is moved, monitoring the supply voltage provided for the position transmitter or monitoring the quality of the position sensor measuring signal, in particular by evaluating its amplitude. The results of these surveys are also traditionally provided at typically digital status outputs of the signal wall device for further use and processing.
- the tapping of this status information can be done for example with the help of a professional bus.
- An example of a traditionally used signal converter, also called a gateway, which is suitable for connection to the Profibus, is, for example, the signal converter "Profibus DPVO" from Leine & Linde GmbH, Aalen, Germany
- These monitoring functions in the signal conditioners condition monitoring
- the signal converter devices are always specially adapted to the particular position transmitter used, in particular to the position sensor measurement signal generated by it.
- Signal converter devices with the mentioned monitoring functions for realizing a desired condition monitoring are currently only available for the abovementioned traditionally used magnetostrictive, magnetoresistive or LVDT sensors.
- Such a measuring system consisting of position sensors and signal converters tuned thereto, as used in particular for rolling stands, is produced, for example, by Magnescale Europe GmbH, Mori Seiki Co. Ltd. offered.
- the position encoder comprises a scale MSS 976 R and a read head HA-705-Lk-907.
- a suitable signal converter (gateway) is the MD 50 2 N (2 channels) or the MD 50 4 N (4 channels).
- photoelectric position sensors are preferably used.
- An example of such a photoelectric position sensor with a resolution in the micrometer range is known from the series LIA Numerik Jena.
- Another advantage of these known photoelectric position sensor is the extended measuring range, which meets the requirements in the field of rolling technology.
- the disadvantage of this optically scanning position sensor is that it is more susceptible to contamination than the above-mentioned traditionally used sensors. It is therefore preferably installed in a rolling mill-compatible protective housing.
- Photoelectric encoders are not signal compatible with known signal transducers having said integrated monitoring functions.
- the present invention has the object, a known measuring device, an associated measuring method, a known rolling stand and an associated method for operating the rolling mill further to the effect that detects the position of actuators with a higher accuracy and at the same time the reliability, in particular the reliability of the position sensor and the roll stand can be increased.
- This object is first achieved by the claimed measuring device.
- This measuring device is characterized in that the position sensor is designed in the form of a photoelectric position sensor and the signal conversion device is adapted to receive the position sensor measuring signal of the photoelectric position sensor, convert into the Wandlerausgangsmesssig- signal with a desired signal format and in the context of an integrated first monitoring function, the amplitude of Position encoder measuring signal to compare with a predetermined amplitude threshold. The result of this comparison is preferably output at a first status output of the signal converter device.
- This claimed measuring device advantageously combines the very high measuring accuracy of the photoelectric position sensor in the micrometer range with the first monitoring function for the position sensor.
- the amplitude comparison in the context of the first monitoring function can advantageously be a conclusion to the operability of the position sensor and / or the protective housing and / or an associated actuator of a system, for example a rolling stand to. In this way, the reliability of the position sensor and the system is significantly increased.
- the claimed conversion of the signal format is required in order to output the position encoder measurement signal or the converter output measurement signal to a control device of the system can.
- the control device is in usually only able to recognize and process a particular, the desired signal format.
- control device or the automation system of the system can be advantageously supplied with the aid of the present invention preferably in real time with highly accurate position measurement data, which are also reliable due to the monitoring function (s) performed.
- the photoelectric position sensor is advantageously designed to represent the position of the actuator with a resolution of 80-1 microns, preferably even 50-1 microns. Furthermore, it can be provided that, after an interpolation of the position encoder measuring signal in the signal converter device, the converter output measurement signal (S3) represents a resolution for the position of the actuator (120) of 10-1 pm, preferably 4-0.01 pm.
- the signal converter device is designed to receive the position encoder measurement signal and to convert it into the desired signal format. An intermediate conversion is undesirable because of the associated additional fault liability and also not required.
- the supply voltage provided for the photoelectric position transmitter is compared with at least one predetermined voltage threshold value and the result is displayed at a second status output of the signal converter device. In this way, condition monitoring ensures that a fault in the power supply of the photoelectric position sensor takes place in good time can be detected and corrected before the locator may fail completely.
- the speed derived from the position encoder measurement signal and / or the determined acceleration with which a change in the position of the actuator is compared with a predetermined speed and / or acceleration threshold value and the result of this comparison on a If the predetermined speed and / or acceleration threshold values are exceeded or exceeded, the result can be a defect in the position transmitter or in the actuator. Individual or both components can then be replaced immediately, in some cases long before routine check-ups, which typically only occur at longer intervals. Furthermore, a calibration function can be provided in the signal converter device for recalibrating the photoelectric position sensor.
- the recalibration comprises, in particular, an automatically regulated adaptation of the input impedance of the signal converter device to the impedance of the line between the position transmitter and the signal converter device.
- the recalibration can be displayed on a fourth status output of the signal converter device.
- the second and third monitoring functions as well as the calibration function may be present individually or in combination in addition to the first monitoring function.
- the status signals at the status outputs of the signal converter simplify troubleshooting and increase operational safety and system availability.
- the status outputs enable an alarm to be generated upon reaching or exceeding or falling below the specified threshold values.
- the signal converter device can be connected to a data bus, for example the profile bus, preferably the real-time bus EtherCat.
- the status outputs of the signal converter can be conveniently read out via the data bus.
- Signal converters can also be parameterized remotely via the bus interface.
- the signal converter device with its numerous functions is preferably designed in the form of a Field Programmable Gate Array FPGA.
- the abovementioned object of the invention is furthermore achieved by a measuring method, a rolling stand with the claimed measuring device and by a method for operating the rolling stand.
- the advantages of these solutions correspond to the advantages mentioned above with reference to the claimed measuring device.
- the actuators according to the invention are, for example, hydraulic cylinders. These can be used in the roll stand for different functions and, accordingly, also at different positions in the roll stand.
- a first actuator can be a setting cylinder for setting the roller perpendicular to the plane xz of the rolling stock to be rolled, that is, for adjusting the rolling gap of the rolling stand.
- a second actuator may serve to displace the roller in its axial direction z.
- a third actuator may be configured to move the roller in or against the rolling direction x parallel to the plane xy of the rolling stock (horizontal shifting).
- a fourth actuator may also be designed as a bending device, in particular as a bending cylinder for setting a desired bending of the roller, in particular the working and / or intermediate rollers. In the adjusting device, individual or a combination of the first, second, third and fourth actuators may be provided.
- roller in the sense of the invention means a work roll, a support roll and / or an intermediate roll in the roll stand.
- the position sensor is advantageously installed in a protective housing.
- the first monitoring function advantageously makes it possible, in particular, to monitor the protective housing for mechanical errors (leaks and / or mechanical games) and to predict a possible failure on the basis of the signal amplitude.
- FIG. 1 shows the measuring chain of the present invention
- FIG. 2 shows a rolling stand with the photoelectric according to the invention
- FIG. 1 shows the measuring device 100 according to the invention as part of a measuring chain.
- the measuring device 100 initially comprises a photoelectric posi- tion generator 1 10, which is associated with a system, for example a rolling stand.
- the position sensor 1 10 is followed directly, without the interposition of an intermediate converter means, a signal converter means 120 downstream.
- the signal converter device 120 supplies the position transmitter 1 10 with a supply voltage U.
- the photoelectric position sensor 1 10 generates a position transmitter measuring signal S1 as an output signal, which is received by the signal converter device 120.
- the signal converter device 120 is designed to convert the received position encoder measurement signal S1 into a desired signal format and to output the resulting signal as a converter output measurement signal S3, for example to a controller 200 for the system (not shown in FIG. 1).
- the desired signal format corresponds to the signal format, which can be received and processed by the control device.
- the control device 200 may generally be an automation device, in particular also a control device.
- the control device 200 is typically designed to control at least one actuator 320 of the system, preferably taking into account the received converter output measurement signal S3.
- the signal lines shown in FIG. 1 for transmitting the position encoder measuring signal S1, the converter output measuring signal S3 and for controlling the actuator 320 may be formed at least partially in the form of optical waveguides.
- the use of optical waveguides offers the advantage of low losses in signal transmission over long distances and low susceptibility to interference, in particular to electromagnetic interference.
- the signal transmission on all the said signal lines is preferably in real time.
- the signal converter device 120 is adapted to be coupled to a preferably digital data bus, for example the Profibus.
- a preferably digital data bus for example the Profibus.
- EtherCat Especially recommended for use in metallurgical plants, such as rolling mills, is the real-time bus EtherCat.
- This bus has the advantage that both the position encoder measuring signal and the status signals generated by the signal converter device 120 and the transducer output measurement signal may preferably be transmitted jointly via the bus.
- the preferably digital status signals output at the status outputs 121, 122, 123, 124 of the signal converter device 120 can, for example, be output via the data bus 130 to the control device 200 and / or a display device 500.
- FIG. 2 shows a preferred application for the measuring device according to the invention, namely a rolling stand 300.
- the rolling stand 300 comprises two opposing work rolls 310, which are arranged at a distance from one another and span a rolling gap for rolling rolling stock 400.
- the roll stand 300 optionally includes the intermediate rolls 312 and support rolls 314, likewise shown in FIG. 2, which are mounted so as to be displaceable in bearing housings, so-called chocks, in the stand window 330 of the rolling mill stand 300.
- the rolling direction is designated by the parameter x. From this, the parameters y and z denote the other Cartesian coordinates.
- actuators 320 are further shown for hiring the rollers, in particular the work rolls.
- the first actuator 320-1 is adapted to effect a vertical adjustment of the rollers and in particular the work rolls and thus an adjustment of the size of the nip between the work rolls.
- actuators 320-2 are shown, which may be formed as a bending device for setting a desired bending of the work rolls 310 and / or the intermediate rolls 312.
- actuators for vertical adjustment and bending further actuators for axial and horizontal displacement of particular Work rolls can be provided, which are not shown in Figure 2.
- actuators are according to the invention associated with photoelectric position sensor 1 10 for detecting the respective current position of the actuators 320, preferably with a resolution of 1-100 microns, preferably 1-50 microns.
- the position of the actuator thus detected is in each case represented by the position sensor measurement signal S1 generated by the position transmitter 110 and supplied to the signal converter device 120 according to FIG.
- the position encoder measurement signal S1 is evaluated in the signal converter device 120 in various ways.
- a first evaluation takes place within the framework of a performance of a first monitoring function, which provides that the amplitude of the position encoder measuring signal S1 is compared with a predetermined amplitude threshold value.
- Such monitoring of the signal level or the amplitude allows a statement about the quality of the position encoder measurement signal.
- the signal quality in turn allows a statement about the functionality of the position sensor 1 10 or its associated parts of the system, in particular the actuators 320 or the protective housing.
- amplitude thresholds By appropriate selection of the amplitude thresholds, a statement can be made as to whether the amplitude of the position encoder measurement signal reaches the predetermined amplitude threshold value to 100% or only to a limited extent, for example to 87, 63 or even only 44% percent.
- this monitoring in the signal converter device 120 it is possible to draw conclusions about the general and / or mechanical state of, in particular, the measuring device 100, more particularly the position measuring device 110.
- the photoelectric encoder typically includes an optoelectronic readhead and a high resolution ruler in the micrometer range, wherein in one measurement either the ruler on the readhead or vice versa, the readhead is pushed past the ruler.
- the position of, in particular, the actuator 320 is determined precisely. Long periods of operation can cause soiling and / or wear, such as knock-outs or mechanical play. These fouling or wear can also occur, although the photoelectric position sensor is preferably housed in a protective housing. If the threshold comparison shows that the position encoder 1 10 no longer delivers the full amplitude, this suggests that the said mechanical wear or contamination of the position sensor.
- a second monitoring function can be integrated in the signal converter device 120.
- This second monitoring function provides for comparing the supply voltage U, which is typically provided by the signal converter device 120 for the position transmitter 1100, with at least one predetermined voltage threshold value. In this way it can be easily checked whether the supply voltage for the position sensor 1 10 does not fall below a predetermined minimum value. The result of this comparison is preferably output at a second digital status output 122 of the signal converter device 120. Furthermore, a third monitoring function can be integrated in the signal converter device 120, the position encoder measuring signal S1 being evaluated with regard to the speed and / or the acceleration with which the change of the position of the actuator takes place.
- the thus determined speed and / or acceleration is in each case compared with a predefined speed and / or acceleration threshold value, and the result of this comparison is preferably output digitally at a third status output 121 of the signal converter device 120.
- the third monitoring function can also provide that no comparison takes place and that the determined speed and / or acceleration as such is output eg via the data bus from the signal converter device.
- a detected deviation for example the determined acceleration from the acceleration threshold value, may indicate a more or less existing play of the mechanical components in the roll stand, for example play of the chocks of the rolls 310, 312, 314 or play with the position sensor not mounted correctly.
- a calibration function can be integrated in the signal converter device, which checks, for example, whether the calibration of the photoelectric position sensor is still correct. With or without such prior checking, the integrated calibration function is configured to recalibrate the photoelectric position sensor.
- an interpolation function can be integrated in the signal converter device which interpolates the received position encoder measurement signal.
- the transducer output measurement signal then represents the interpolated (and typically also converted) position encoder measurement signal.
- the interpolation has the advantage that the resolution of the position of the actuator associated with the position transmitter can be specified even more accurately than by the non-interpolated position sensor measurement signal. While the photoelectric position encoder measurement signal already enables a resolution of 80-1 pm, preferably 50-1 pm, the interpolated position encoder measurement signal or the converter output measurement signal permits a resolution of 10 -1 pm, preferably 4 - 0.01 pm.
- the signal converter device 120 with the integrated first, second and / or third monitoring function and optionally also with the calibration function and the interpolation function is preferably in the form of a field-programmable gate array.
- the signal converter 120 also called a gateway, provides the status signals which enable monitoring, in particular, of the position transmitter 110, but also of the associated system parts; Keyword: "Condition Monitoring” be designed to provide certain additional information, such as operating time, error rate, type of error, semi-absolute position and the above-mentioned monitoring functions or provide.
- Keyword: "Condition Monitoring” be designed to provide certain additional information, such as operating time, error rate, type of error, semi-absolute position and the above-mentioned monitoring functions or provide.
- the signal converter device 120 preferably receives a position value via the data bus. For this position value, the signal converter device 120 can add, depending on the direction, the respective current position, which is represented by the position encoder measuring signal S1, and the thus formed semi-absolute position can subsequently be interrogated again via the
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Abstract
L'invention concerne un dispositif de mesure et une cage de laminoir ainsi qu'un procédé associé pour une détection de position de grande précision. Selon la présente invention, pour augmenter la précision de mesure et la fiabilité du dispositif de mesure sous la forme d'un codeur de mesure, le codeur de position est réalisé sous la forme d'un codeur de position photoélectrique et un dispositif de conversion de signal (120) associé au codeur de position photoélectrique est configuré de telle sorte que non seulement le signal de codeur de position (S1) du codeur de position photoélectrique est reçu et converti en le signal de sortie de convertisseur avec la forme de signal souhaitée, mais encore l'amplitude du signal de codeur de position y est également comparée avec une valeur de seuil d'amplitude prédéfinie.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010032675 | 2010-07-28 | ||
| DE102010032675.5 | 2010-07-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2012013759A2 true WO2012013759A2 (fr) | 2012-02-02 |
| WO2012013759A3 WO2012013759A3 (fr) | 2012-03-22 |
Family
ID=44629161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/063052 Ceased WO2012013759A2 (fr) | 2010-07-28 | 2011-07-28 | Dispositif de mesure et cage de laminoir ainsi que procédé d'exploitation des deux dispositifs |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012013759A2 (fr) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09507040A (ja) * | 1993-10-28 | 1997-07-15 | ペレッタ グラフィクス コーポレーション | インク濃度を保持するためのシステム |
| WO1997040344A1 (fr) * | 1996-04-23 | 1997-10-30 | R.D.P. Electronics Ltd. | Transducteur optique, et procede et ensemble diode laser associes |
| US6032898A (en) * | 1996-08-29 | 2000-03-07 | Alwin Manufacturing Co. | Multiple roll towel dispenser |
| US6232594B1 (en) * | 1999-06-22 | 2001-05-15 | Hewlett-Packard Company | Feedback control system using optical incremental position encoder with dual sinusoidal intensity patterns |
| FI4574U1 (fi) * | 2000-03-13 | 2000-09-11 | Matti Poenkkae | Säädettävä putken hitsausrullasto |
| DE10056605A1 (de) * | 2000-11-15 | 2002-05-23 | Kostal Leopold Gmbh & Co Kg | Verfahren zur Signalauswertung einer optoelektronischen Weg-oder Winkelmeßeinrichtung sowie Verwendung eines solchen Verfahrens |
| DE10056604A1 (de) * | 2000-11-15 | 2002-05-23 | Kostal Leopold Gmbh & Co Kg | Verfahren zur Signalauswertung einer optoelektronischen Weg-oder Winkelmeßeinrichtung sowie Verwendung eines solchen Verfahrens |
| DE102005042835B3 (de) * | 2005-09-09 | 2007-05-31 | Sms Meer Gmbh | Walzwerk zum Herstellen von Rohren und Stäben oder dergleichen Langprodukten |
| CN101463418A (zh) * | 2008-11-20 | 2009-06-24 | 无锡五冶金属压延有限公司 | 带有位置检测装置的立式活套移动辊架机构 |
-
2011
- 2011-07-28 WO PCT/EP2011/063052 patent/WO2012013759A2/fr not_active Ceased
Non-Patent Citations (1)
| Title |
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| None |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012013759A3 (fr) | 2012-03-22 |
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