EP2203649A1 - Method and device for indicating the position of hydraulically activated armatures - Google Patents

Method and device for indicating the position of hydraulically activated armatures

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Publication number
EP2203649A1
EP2203649A1 EP08801637A EP08801637A EP2203649A1 EP 2203649 A1 EP2203649 A1 EP 2203649A1 EP 08801637 A EP08801637 A EP 08801637A EP 08801637 A EP08801637 A EP 08801637A EP 2203649 A1 EP2203649 A1 EP 2203649A1
Authority
EP
European Patent Office
Prior art keywords
pressure medium
valve
pulses
pressure
medium line
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.)
Granted
Application number
EP08801637A
Other languages
German (de)
French (fr)
Other versions
EP2203649B1 (en
Inventor
Michael Middelanis
Stephan Quinkert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PLEIGER MASCHINENBAU GMBH & CO. KG
Original Assignee
Pleiger Maschinenbau & Co KG GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pleiger Maschinenbau & Co KG GmbH filed Critical Pleiger Maschinenbau & Co KG GmbH
Priority to PL08801637T priority Critical patent/PL2203649T3/en
Publication of EP2203649A1 publication Critical patent/EP2203649A1/en
Application granted granted Critical
Publication of EP2203649B1 publication Critical patent/EP2203649B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed

Definitions

  • the invention relates to a method and a device for the position indicator of hydraulically actuated valves, in particular in shipbuilding, which are acted upon via a hydraulic line from a central control point with pressure medium.
  • the indication of the position of such hydraulically actuated valves is made about the intake volume of the valve, which can be arranged on a ship at a distance of for example 200 m from the central control unit.
  • the compressibility of the pressure medium affects the accuracy of the position indicator.
  • the object of the invention is to provide the display of the position of hydraulically actuated valves of the type described in such a way that with little effort, a high accuracy of the position indicator is achieved.
  • the influence of the compressibility of the pressure medium is determined and compensated for in one embodiment by the fact that when switching the pressure medium line as the pressure-carrying pressure line occurring during the adjusting movement of the valve higher Counted number of pulses and from which the lower number of pulses is subtracted, which is then counted when the pressure medium line is switched at the same travel of the valve as a non-pressurized return line.
  • the difference in the number of pulses corresponds to the influence of the compressibility.
  • the pulses are counted at a predetermined travel when the pressure medium line is connected as a pressure line, whereupon the pressure line is depressurized and the pulses occurring during decompression are counted.
  • the number of pulses corresponding to the compressibility is disregarded in the further actuating movements of the valve in order to compensate for the influence of the compressibility.
  • a unit which, for example, comprises a rotary flap 1.1 arranged in a pipe, not shown, which is adjusted by a setting cylinder 1.2, for example via a toothed rack, which is connected on opposite sides with hydraulic or pressure medium lines 2 and 3.
  • check valves 1.3 and pressure relief valves 1.4 are arranged in a conventional circuit.
  • a central control unit is shown schematically, at which a larger number of valves is controlled, which may be located at a greater distance from the control unit.
  • a control unit 4 is a known control valve 4.1 is arranged for each valve, through which one or the other side of the actuating cylinder 1.2 is acted upon by pressure medium, while the respective other pressure medium line 2 and 3 is connected as a return line.
  • P the hydraulic line connected to a pressure medium source, not shown
  • T is the return line leading to a reservoir, not shown.
  • a flow sensor 5 is arranged in one of the two pressure medium lines 2 or 3, which converts the flow of pressure fluid flowing through the line into a series of electrical pulses, which are indicated at 5a.
  • the flow sensor 5 may, for example, have a wheel driven by the flow of pressure medium, which generates electrical impulses without contact via Hall sensors. Such Flow sensors or measuring devices are known per se.
  • the signals emitted by the flow sensor 5 may be, for example, rectangular signals, as shown schematically at 5a, wherein a pulse corresponds to a predetermined volume unit of the pressure medium.
  • a pulse can correspond to a volume unit of, for example, 0.05 cm 3 of the pressure medium flowing through the line.
  • a control and display unit with a display 6.1 and control buttons 6.2 is designated, which is connected via first electrical lines 6.3 at a and b with the opposite sides of the control valve 4.1, which is connected by one solenoid in one or the other position becomes. Furthermore, the display unit 6 is connected via second electrical lines 6.41 and 6.42 to the flow sensor 5, through which different pulses corresponding to the flow direction of the pressure medium are forwarded to the display unit 6 or to a program provided therein, in which the signals or pulse numbers are processed. With 6.5 electrical lines for powering the display unit 6 are designated.
  • the flow direction of the pressure medium can be identified on the basis of the pulse sequences.
  • the direction of flow of the pressure medium is detected by means of a directional logic as open or closed position.
  • 6.4 pulses are transmitted via the one electric line in the flow of the pressure medium in one direction and via the electrical line 6.42 pulses in the flow in the other direction.
  • the distinction between flow and return in the pressure medium line 2 results essentially by the direction of rotation of the wheel in the flow sensor 5 and by the direction of rotation detection on the pulse generator, whether it rotates to the right or to the left.
  • the compressibility can be determined in the manner that the number of pulses is counted in a full travel of the piston in the actuating cylinder 1.2 when the pressure medium line 2 is connected as a pressure-carrying pressure line, and in the same manner the number of pulses is counted when the pressure medium line 2 is connected as a non-pressurized return line, the difference in the two determined pulse counts at the same travel corresponds to the compressibility.
  • only the number of pulses is stored, which is determined during expansion of the pressure line, while in the other embodiment, the number of pulses during the closing and opening process is stored and offset against each other. It is also possible to combine both embodiments in the program.
  • the program processing the pulses is expediently designed as a learning program, wherein after installation of the position indicator, predetermined program steps take place, by which the position indicator itself adjusts to the respective valve including the type of pipeline. This eliminates a time-consuming adjustment of the position indicator to the often very different in the displacement valves and the different cable lengths and cable cross-sections.
  • the control valve 4.1 is adjusted by the program in the control and display unit 6 in the end position via one of the electrical lines 6.3 for approaching an end position of the valve, for example, to start the closed position, so that with the Positioning cylinder 1.2 associated flap on the pressure line connected as a pressure line 3 is moved into the closed position.
  • This end position can be specified as the starting position for the counting of occurring pulses.
  • the valve is moved from the program to the other end position, in this embodiment in the open position, wherein the pressure medium line 2 is switched as a pressure line and the pulses occurring during the adjusting movement in the open position are counted.
  • the control valve 4.1 is adjusted by the program in the middle position and thus the pressure line 2 is depressurized, with the pressure medium in the line 2 relaxes.
  • a return flow occurs in the line 2, which corresponds to the decompression of the pressure medium and is determined by counting the pulses occurring in terms of its volume.
  • the number of pulses that was measured during the decompression of the pressure medium when the pressure medium line 2 is switched again as a pressure line. In other words, the number of pulses corresponding to the decompression is subtracted from the previously measured total number of pulses in order to obtain the corresponding number of pulses for the given travel.
  • the influence of the compressibility can also be determined by counting and storing the number of pulses that occur in a full travel of the piston in the actuating cylinder when the pressure medium line 2 is switched as a pressure line and a return line. The difference between the measured pulse numbers indicates the influence of the compressibility of the pressure medium.
  • This learning or testing program is preferably carried out automatically before each start-up or after a repair of the valve to determine the corresponding pulse numbers. By running the test program before each startup, any errors that have occurred can be detected. When the test program is executed after a valve repair, the plant operator does not need to re-adjust the position indicator to the existing system.
  • the test program is preferably carried out even when intermediate positions of the valve are approached.
  • the pressure medium line 2 is connected, for example, as a pressure line to move the actuating cylinder 1.2 in a predetermined intermediate position, wherein the occurring number of pulses is counted. Then the flap or the actuating cylinder is fixed in the intermediate position reached and the pressure medium line 2 is depressurized, wherein the pulse number occurring during the decompression of the pressure medium is measured. If the valve is to be moved back into the same or any other intermediate position, the influence of the compressibility occurring is compensated for by disregarding the number of pulses determined during decompression.
  • the display unit 6 is specified in the program that a pulse number of, for example, "five per unit time for the position indicator is disregarded, it being assumed in this example that five pulses correspond to a change in volume of the pressure medium at a higher or lower temperature compared to normal operating temperature.
  • a temperature sensor can be provided on the flow sensor 5 and / or on the control cylinder 1.2, which transmits the corresponding measured values to the program in the display unit 6.
  • leaks in the hydraulic system can be detected and displayed on the display unit 6, for example, if in the closed position of the valve impulses continue to occur, or the measured number of pulses no longer coincides with that before commissioning by the test program as that number of pulses which corresponds to a full travel. As a result, the reliability is increased by fault detection.
  • the program in the display unit 6 can also be designed to control the valve in such a way that on the display 6.1 an intermediate position of the valve can be selected, for example, 40%, whereupon the control is triggered by one of the control buttons. The valve is then automatically moved to the intermediate position of 40% and held in this position when reaching the intermediate position.
  • the control valve 4.1 is controlled via the electrical lines 6.3 until the predetermined intermediate position is reached, whereupon the power supply of the control valve 4.1 is interrupted by the program.
  • the display unit 6 also serves as a control unit, wherein for the control of the valve via the control valve 4.1, the previously determined pulse data from the flow sensor 5 are processed by the program.
  • the display device described is not only in shipbuilding of great advantage, because with simple means a precise position indicator can be achieved.
  • the display device can also be used in industrial plants, for example in refineries. She is also at relatively short lines of, for example, 20 m between the control point and the fitting can be used, in which the compressibility is manifested by different numbers of pulses between the pressure-leading and unpressurized return lines.
  • the display device can also be provided in a hydraulically operated valve, which is supplied with pressure medium only via a pressure medium line, wherein the piston acted upon with pressure medium in the actuating cylinder 1.2 operates against a spring which causes a return of the piston when the pressure medium line is switched to return ,
  • the piston can be fixed in the actuating cylinder in the position with cocked spring, so that when Drucklosschalt the pressure medium line occurring by decompression of the pressure medium pulse number can be measured, which corresponds to the influence of the compressibility on the position indicator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Measuring Fluid Pressure (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

The invention relates to a method for indicating the position of a hydraulically activated armature, comprising an actuating cylinder (1.2) for activating the armature (1.1), said actuating cylinder being connected by at least one pressure medium line (2, 3) to a control valve (4.1) by means of which the pressure medium line may be switched between a pressure-conducting forward flow and a pressure-free return flow, wherein the flow through the pressure medium line is converted into a number of electrical pulses and the number of pulses reflecting the flow is processed in a program of a display unit (6) such that the number of pulses occurring in the case of a predetermined control path with a pressure-free flow in the pressure medium line is calculated as the same control path when the pressure medium line is connected as a pressure line.

Description

Verfahren und Vorrichtung zur Stellungsanzeige von hydraulisch betätigten Armaturen Method and device for indicating the position of hydraulically actuated valves
Die Erfindung betrifft ein Verfahren und eine Vorrichtung für die Stellungsanzeige von hydraulisch betätigten Armaturen, insbesondere im Schiffbau, die über eine Hydraulikleitung von einer zentralen Steuerstelle aus mit Druckmittel beaufschlagt werden.The invention relates to a method and a device for the position indicator of hydraulically actuated valves, in particular in shipbuilding, which are acted upon via a hydraulic line from a central control point with pressure medium.
Die Anzeige der Stellung von solchen hydraulisch betätigten Armaturen, wie Dreh- und Linearantrieben, wird über das Schluckvolumen der Armatur vorgenommen, die auf einem Schiff in einem Abstand von beispielsweise 200 m von der zentralen Steuerstelle angeordnet sein kann. Bei derartigen Leitungslängen wirkt sich die Kompressibilität des Druckmittels auf die Genauigkeit der Stellungsanzeige aus. So ist es beispielsweise aus DE 44 29 019 bekannt, eine aufwändige hydraulische Schaltung vorzusehen, um die durch die Kompressibilität des Druckmittels erzeugte Ungenauigkeit der Stellungsanzeige auszugleichen.The indication of the position of such hydraulically actuated valves, such as rotary and linear actuators, is made about the intake volume of the valve, which can be arranged on a ship at a distance of for example 200 m from the central control unit. With such line lengths, the compressibility of the pressure medium affects the accuracy of the position indicator. Thus, it is known for example from DE 44 29 019 to provide a complex hydraulic circuit to compensate for the inaccuracy of the position indicator generated by the compressibility of the pressure medium.
Aufgabe der Erfindung ist es, die Anzeige der Stellung von hydraulisch betätigten Armaturen der eingangs angegebenen Art so auszubilden, dass bei geringem Aufwand eine hohe Genauigkeit der Stellungsanzeige erreicht wird.The object of the invention is to provide the display of the position of hydraulically actuated valves of the type described in such a way that with little effort, a high accuracy of the position indicator is achieved.
Diese Aufgabe wird erfϊndungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Dadurch, dass der Durchfluss durch die Hydraulik- bzw. Druckmittelleitung in elektrische Impulse umgewandelt wird, die zur Stellungsanzeige verwendet werden, ist es möglich, bei einfachem Aufbau der Vorrichtung die Stellung der von der Steuerstelle entfernt angeordneten Armatur zuverlässig und genau festzustellen, weil ein Impuls nur einem geringen Durchsatzvolumen an Druckmittel entspricht. Die Signalverarbeitung in einem Programm ermöglicht es, die Kompressibilität des Druckmittels und auch Temperatureinflüsse auf die Stellungsanzeige in einfacher Weise zu kompensieren.This object is achieved erfϊndungsgemäß by the features of claim 1. Characterized in that the flow is converted by the hydraulic or pressure medium line into electrical pulses that are used for position indicator, it is possible to reliably and accurately determine the position of the remote from the control unit valve with a simple structure of the device, because a pulse corresponds only to a small throughput volume of pressure medium. The signal processing in a program makes it possible to compensate for the compressibility of the pressure medium and also temperature effects on the position indicator in a simple manner.
Erfindungsgemäß wird der Einfluss der Kompressibilität des Druckmittels nach einer Ausführungsform dadurch festgestellt und kompensiert, dass bei Schaltung der Druckmittelleitung als druckführende Druckleitung die bei der Stellbewegung der Armatur auftretende höhere Zahl von Impulsen gezählt und davon die niedrigere Zahl von Impulsen abgezogen wird, die dann gezählt wird, wenn die Druckmittelleitung bei gleichem Stellweg der Armatur als drucklose Rücklaufleitung geschaltet ist. Der Differenzbetrag der Impulszahlen entspricht dem Ein- fluss der Kompressibilität. Nach einer anderen Ausführungsform werden die Impulse bei vorgegebenem Stellweg gezählt, wenn die Druckmittelleitung als Druckleitung geschaltet ist, worauf die Druckleitung drucklos geschaltet wird und die bei der Dekompression auftretenden Impulse gezählt werden. Die der Kompressibilität entsprechende Impulszahl bleibt bei den weiteren Stellbewegungen der Armatur unberücksichtigt, um den Einfluss der Kompressibilität zu kompensieren.According to the invention, the influence of the compressibility of the pressure medium is determined and compensated for in one embodiment by the fact that when switching the pressure medium line as the pressure-carrying pressure line occurring during the adjusting movement of the valve higher Counted number of pulses and from which the lower number of pulses is subtracted, which is then counted when the pressure medium line is switched at the same travel of the valve as a non-pressurized return line. The difference in the number of pulses corresponds to the influence of the compressibility. According to another embodiment, the pulses are counted at a predetermined travel when the pressure medium line is connected as a pressure line, whereupon the pressure line is depressurized and the pulses occurring during decompression are counted. The number of pulses corresponding to the compressibility is disregarded in the further actuating movements of the valve in order to compensate for the influence of the compressibility.
Die Erfindung wird beispielsweise anhand der Zeichnung näher erläutert, die schematisch eine Vorrichtung zur Stellungsanzeige wiedergibt, bei der die Armatur über zwei Druckmittelleitungen beaufschlagt wird.The invention will be explained in more detail for example with reference to the drawing, which schematically shows a device for position indicator, in which the valve is acted upon by two pressure medium lines.
Mit 1 ist eine Einheit bezeichnet, die beispielsweise eine in einer nicht dargestellten Rohrleitung angeordnete Drehklappe 1.1 umfasst, die durch einen Stellzylinder 1.2 beispielsweise über eine Zahnstange verstellt wird, der auf gegenüberliegenden Seiten mit Hydraulik- bzw. Druckmittelleitungen 2 und 3 verbunden ist. In der Einheit 1 sind Rückschlagventile 1.3 und Druckbegrenzungsventile 1.4 in an sich bekannter Schaltung angeordnet.1 denotes a unit which, for example, comprises a rotary flap 1.1 arranged in a pipe, not shown, which is adjusted by a setting cylinder 1.2, for example via a toothed rack, which is connected on opposite sides with hydraulic or pressure medium lines 2 and 3. In the unit 1 check valves 1.3 and pressure relief valves 1.4 are arranged in a conventional circuit.
Bei 4 ist schematisch eine zentrale Steuerstelle wiedergegeben, an der eine größere Anzahl von Armaturen gesteuert wird, die sich in einer größeren Entfernung von der Steuerstelle befinden können. Zur Vereinfachung der Darstellung ist nur eine Armatur 1.1 wiedergegeben. In der Steuerstelle 4 ist ein an sich bekanntes Stellventil 4.1 für jede Armatur angeordnet, durch das die eine oder andere Seite des Stellzylinders 1.2 mit Druckmittel beaufschlagt wird, während die jeweils andere Druckmittel leitung 2 bzw. 3 als Rücklaufleitung geschaltet wird. Mit P ist die mit einer nicht dargestellten Druckmittelquelle verbundene Hydraulikleitung bezeichnet und mit T die Rücklaufleitung, die zu einem nicht dargestellten Reservoir führt.4, a central control unit is shown schematically, at which a larger number of valves is controlled, which may be located at a greater distance from the control unit. To simplify the illustration, only one valve 1.1 is shown. In the control unit 4 is a known control valve 4.1 is arranged for each valve, through which one or the other side of the actuating cylinder 1.2 is acted upon by pressure medium, while the respective other pressure medium line 2 and 3 is connected as a return line. With P the hydraulic line connected to a pressure medium source, not shown, and T is the return line leading to a reservoir, not shown.
Vorzugsweise im Bereich der Steuerstelle 4 ist in einer der beiden Druckmittelleitungen 2 oder 3 ein Durchflusssensor 5 angeordnet, der die Strömung des durch die Leitung fließenden Druckmittels in eine Folge von elektrischen Impulsen umwandelt, die bei 5a angedeutet sind. Der Durchflusssensor 5 kann beispielsweise ein von der Druckmittelströmung angetriebenes Rad aufweisen, das über Hallsensoren berührungsfrei elektrische Impulse erzeugt. Derartige Durchflusssensoren bzw. -messgeräte sind an sich bekannt. Die von dem Durchflusssensor 5 abgegebenen Signale können beispielsweise Rechtecksignale sein, wie dies schematisch bei 5a wiedergegeben ist, wobei ein Impuls einer vorgegebenen Volumeneinheit des Druckmittels entspricht. Ein Impuls kann dabei einer Volumeneinheit von z.B. 0,05 cm3 des durch die Leitung strömenden Druckmittels entsprechen.Preferably, in the area of the control station 4, a flow sensor 5 is arranged in one of the two pressure medium lines 2 or 3, which converts the flow of pressure fluid flowing through the line into a series of electrical pulses, which are indicated at 5a. The flow sensor 5 may, for example, have a wheel driven by the flow of pressure medium, which generates electrical impulses without contact via Hall sensors. such Flow sensors or measuring devices are known per se. The signals emitted by the flow sensor 5 may be, for example, rectangular signals, as shown schematically at 5a, wherein a pulse corresponds to a predetermined volume unit of the pressure medium. A pulse can correspond to a volume unit of, for example, 0.05 cm 3 of the pressure medium flowing through the line.
Bei 6 ist schematisch eine Steuerungs- und Anzeigeeinheit mit einem Display 6.1 und Steuerknöpfen 6.2 bezeichnet, das über erste elektrische Leitungen 6.3 bei a und b mit den gegenüberliegenden Seiten des Stellventils 4.1 verbunden ist, das durch jeweils einen Solenoid in die eine oder andere Stellung geschaltet wird. Weiterhin ist die Anzeigeeinheit 6 über zweite e- lektrische Leitungen 6.41 und 6.42 mit dem Durchflusssensor 5 verbunden, durch die unterschiedliche Impulse entsprechend der Durchflussrichtung des Druckmittels an die Anzeigeeinheit 6 bzw. an ein darin vorgesehene Programm weitergeleitet werden, in dem die Signale bzw. Impulszahlen verarbeitet werden. Mit 6.5 sind elektrische Leitungen zur Stromversorgung der Anzeigeeinheit 6 bezeichnet.At 6 schematically a control and display unit with a display 6.1 and control buttons 6.2 is designated, which is connected via first electrical lines 6.3 at a and b with the opposite sides of the control valve 4.1, which is connected by one solenoid in one or the other position becomes. Furthermore, the display unit 6 is connected via second electrical lines 6.41 and 6.42 to the flow sensor 5, through which different pulses corresponding to the flow direction of the pressure medium are forwarded to the display unit 6 or to a program provided therein, in which the signals or pulse numbers are processed. With 6.5 electrical lines for powering the display unit 6 are designated.
Durch die Verwendung von zwei Impulssignalen, die um 90° versetzt zueinander sind, lässt sich anhand der Impulsfolgen die Strömungsrichtung des Druckmittels erkennen. In dem Programm der Anzeigeeinheit 6 wird mit Hilfe einer Richtungslogik die Strömungsrichtung des Druckmittels als Auf- oder Zu-Stellbewegung erkannt. Mit anderen Worten werden über die eine elektrische Leitung 6.41 Impulse bei Strömung des Druckmittels in der einen Richtung und über die elektrische Leitung 6.42 Impulse bei der Strömung in der anderen Richtung ü- bertragen. Die Unterscheidung zwischen Vor- und Rücklauf in der Druckmittelleitung 2 ergibt sich im Wesentlichen durch die Drehrichtung des Rades im Durchflusssensor 5 bzw. durch die Drehrichtungserkennung am Impulsgeber, ob dieser nach rechts oder nach links dreht.By using two pulse signals which are offset by 90 ° to one another, the flow direction of the pressure medium can be identified on the basis of the pulse sequences. In the program of the display unit 6, the direction of flow of the pressure medium is detected by means of a directional logic as open or closed position. In other words, 6.4 pulses are transmitted via the one electric line in the flow of the pressure medium in one direction and via the electrical line 6.42 pulses in the flow in the other direction. The distinction between flow and return in the pressure medium line 2 results essentially by the direction of rotation of the wheel in the flow sensor 5 and by the direction of rotation detection on the pulse generator, whether it rotates to the right or to the left.
Wenn die Druckmittelleitung 2 als Druckleitung geschaltet ist und das Druckmittel in Richtung zur Armatur strömt, tritt aufgrund der Kompressibilität des Druckmittels in der Druckleitung eine höhere Impulszahl auf als bei der Rückströmung, wenn die Druckmittelleitung 2 als Rücklaufleitung drucklos geschaltet ist. Hierdurch kann durch das in der Anzeigeeinheit 6 vorhandene Programm anhand der unterschiedlichen Impulszahl die Kompressibilität des Druckmittels herausgerechnet werden, wenn der Kolben im Stellzylinder 1.2 den gleichen Stellweg zurücklegt. Beispielsweise kann die Kompressibilität in der Weise ermittelt werden, dass die Impulszahl bei einem vollen Stellweg des Kolbens im Stellzylinder 1.2 gezählt wird, wenn die Druckmittelleitung 2 als druckführende Druckleitung geschaltet ist, und in der gleichen Weise die Impulszahl gezählt wird, wenn die Druckmittelleitung 2 als drucklose Rücklaufleitung geschaltet ist, wobei der Unterschied in den beiden festgestellten Impulszahlen bei gleichem Stellweg dem Kompressibilitätseinfluss entspricht.When the pressure medium line 2 is connected as a pressure line and the pressure medium flows in the direction of the valve, occurs due to the compressibility of the pressure medium in the pressure line to a higher number of pulses than in the return flow when the pressure medium line 2 is depressurized as a return line. As a result, the compressibility of the pressure medium can be eliminated by the present in the display unit 6 program based on the different number of pulses when the piston in the control cylinder 1.2 covers the same travel. For example, the compressibility can be determined in the manner that the number of pulses is counted in a full travel of the piston in the actuating cylinder 1.2 when the pressure medium line 2 is connected as a pressure-carrying pressure line, and in the same manner the number of pulses is counted when the pressure medium line 2 is connected as a non-pressurized return line, the difference in the two determined pulse counts at the same travel corresponds to the compressibility.
Bei der einen Ausführungsform wird nur die Impulszahl abgespeichert, die beim Entspannen der Druckleitung ermittelt wird, während bei der anderen Ausführungsform die Impulszahl beim Schließ- und Öffnungsvorgang abgespeichert und miteinander verrechnet wird. Es können im Programm auch beide Ausführungsformen kombiniert werden.In one embodiment, only the number of pulses is stored, which is determined during expansion of the pressure line, while in the other embodiment, the number of pulses during the closing and opening process is stored and offset against each other. It is also possible to combine both embodiments in the program.
Das die Impulse verarbeitende Programm wird zweckmäßigerweise als Lernprogramm ausgebildet, wobei nach Installation der Stellungsanzeigevorrichtung vorgegebene Programmschritte ablaufen, durch die sich die Stellungsanzeige selbst auf die jeweilige Armatur einschließlich der Art der Rohrleitung einstellt. Damit entfällt eine aufwändige Anpassung der Stellungsanzeige an die im Schluckvolumen oft sehr unterschiedlichen Armaturen und an die unterschiedlichen Leitungslängen sowie Leitungsquerschnitte.The program processing the pulses is expediently designed as a learning program, wherein after installation of the position indicator, predetermined program steps take place, by which the position indicator itself adjusts to the respective valve including the type of pipeline. This eliminates a time-consuming adjustment of the position indicator to the often very different in the displacement valves and the different cable lengths and cable cross-sections.
Nach einem Ausführungsbeispiel des Lern- bzw. Prüfprogramms wird das Stellventil 4.1 vom Programm in der Steuerungs- und Anzeigeeinheit 6 in die Endstellung über eine der elektrischen Leitungen 6.3 zum Anfahren einer Endstellung der Armatur verstellt, beispielsweise zum Anfahren der Schließstellung, so dass die mit dem Stellzylinder 1.2 in Verbindung stehende Klappe über die als Druckleitung geschaltete Druckmittelleitung 3 in die Schließstellung verfahren wird. Bei Erreichen der End- bzw. Schließstellung kommt der Kolben im Stellzylinder 1.2 an dessen Stirnwand zum Anliegen, so dass kein weiterer Durchfluss durch die Druckmittelleitungen 2 und 3 mehr erfolgt. Diese Endstellung kann als Ausgangsstellung für das Zählen von auftretenden Impulsen vorgegeben werden. Hierauf wird die Armatur vom Programm in die andere Endstellung verfahren, bei diesem Ausführungsbeispiel in die Offenstellung, wobei die Druckmittelleitung 2 als Druckleitung geschaltet wird und die bei der Stellbewegung in die Offenstellung auftretenden Impulse gezählt werden. Hierauf wird das Steuerventil 4.1 vom Programm in die Mittelstellung verstellt und damit die Druckleitung 2 drucklos geschaltet, wobei sich das Druckmittel in der Leitung 2 entspannt. Hierdurch tritt ein Rückstrom in der Leitung 2 auf, der der Dekompression des Druckmittels entspricht und durch Zählen der auftretenden Impulse hinsichtlich seines Volumens festgestellt wird. Zur Kompensation des Einflusses der Kompressibilität wird bei den weiteren Stellbewegungen der Armatur die Impulszahl, die bei der Dekompression des Druckmittels gemessen wurde, unberücksichtigt gelassen, wenn die Druckmittelleitung 2 wieder als Druckleitung geschaltet wird. Mit anderen Worten wird die der Dekompression entsprechende Impulszahl von der zuvor gemessenen gesamten Impulszahl abgezogen, damit man für den vorgegebenen Stellweg die diesem entsprechende Impulszahl erhält.According to one embodiment of the learning or test program, the control valve 4.1 is adjusted by the program in the control and display unit 6 in the end position via one of the electrical lines 6.3 for approaching an end position of the valve, for example, to start the closed position, so that with the Positioning cylinder 1.2 associated flap on the pressure line connected as a pressure line 3 is moved into the closed position. Upon reaching the end or closed position of the piston in the actuating cylinder 1.2 comes to the end wall to the concern, so that no further flow through the pressure medium lines 2 and 3 more. This end position can be specified as the starting position for the counting of occurring pulses. Thereafter, the valve is moved from the program to the other end position, in this embodiment in the open position, wherein the pressure medium line 2 is switched as a pressure line and the pulses occurring during the adjusting movement in the open position are counted. Thereafter, the control valve 4.1 is adjusted by the program in the middle position and thus the pressure line 2 is depressurized, with the pressure medium in the line 2 relaxes. As a result, a return flow occurs in the line 2, which corresponds to the decompression of the pressure medium and is determined by counting the pulses occurring in terms of its volume. to Compensation of the influence of compressibility is ignored in the further control movements of the valve, the number of pulses that was measured during the decompression of the pressure medium, when the pressure medium line 2 is switched again as a pressure line. In other words, the number of pulses corresponding to the decompression is subtracted from the previously measured total number of pulses in order to obtain the corresponding number of pulses for the given travel.
Der Einfluss der Kompressibilität kann auch dadurch ermittelt werden, dass die Impulszahlen gezählt und gespeichert werden, die bei einem vollen Stellweg des Kolbens im Stellzylinder dann auftreten, wenn die Druckmittelleitung 2 als Druckleitung und als Rücklaufleitung geschaltet wird. Die Differenz zwischen den gemessenen Impulszahlen zeigt den Einfluss der Kompressibilität des Druckmittels an.The influence of the compressibility can also be determined by counting and storing the number of pulses that occur in a full travel of the piston in the actuating cylinder when the pressure medium line 2 is switched as a pressure line and a return line. The difference between the measured pulse numbers indicates the influence of the compressibility of the pressure medium.
Dieses Lern- bzw. Prüfprogramm wird vorzugsweise automatisch vor jeder Inbetriebnahme oder nach einer Reparatur der Armatur ausgeführt, um die entsprechenden Impulszahlen zu ermitteln. Durch Ausführen des Prüfprogramms vor jeder Inbetriebnahme können eventuell inzwischen aufgetretene Fehler festgestellt werden. Bei der Ausführung des Prüfprogramms nach einer Reparatur der Armatur braucht vom Anlagenbetreiber keine Neueinstellung der Stellungsanzeige an das vorhandene System ausgeführt zu werden.This learning or testing program is preferably carried out automatically before each start-up or after a repair of the valve to determine the corresponding pulse numbers. By running the test program before each startup, any errors that have occurred can be detected. When the test program is executed after a valve repair, the plant operator does not need to re-adjust the position indicator to the existing system.
Das Prüfprogramm wird vorzugsweise auch dann ausgeführt, wenn Zwischenstellungen der Armatur angefahren werden. Hierbei wird die Druckmittelleitung 2 beispielsweise als Druckleitung geschaltet, um den Stellzylinder 1.2 in eine vorgegebene Zwischenstellung zu verfahren, wobei die dabei auftretende Anzahl von Impulsen gezählt wird. Hierauf wird die Klappe bzw. der Stellzylinder in der erreichten Zwischenstellung fixiert und die Druckmittelleitung 2 drucklos geschaltet, wobei die bei der Dekompression des Druckmittels auftretende Impulszahl gemessen wird. Wenn die Armatur wieder in die gleiche oder eine andere beliebige Zwischenstellung zu verfahren ist, wird der dabei auftretende Einfluss der Kompressibilität dadurch kompensiert, dass die bei der Dekompression ermittelte Impulszahl unberücksichtigt bleibt.The test program is preferably carried out even when intermediate positions of the valve are approached. Here, the pressure medium line 2 is connected, for example, as a pressure line to move the actuating cylinder 1.2 in a predetermined intermediate position, wherein the occurring number of pulses is counted. Then the flap or the actuating cylinder is fixed in the intermediate position reached and the pressure medium line 2 is depressurized, wherein the pulse number occurring during the decompression of the pressure medium is measured. If the valve is to be moved back into the same or any other intermediate position, the influence of the compressibility occurring is compensated for by disregarding the number of pulses determined during decompression.
Zur Kompensation der Temperatureinflüsse auf die Stellungsanzeige, beispielsweise bei einer auf Deck eines Schiffes montierten Armatur, bei der zwischen Tag und Nacht Temperaturdifferenzen von z.B. 20 °C auftreten, wird im Programm der Anzeigeeinheit 6 vorgegeben, dass eine Impulszahl von z.B. "fünf pro Zeiteinheit für die Stellungsanzeige unberücksichtigt bleibt, wobei bei diesem Beispiel davon ausgegangen wird, dass fünf Impulse einer Volumenänderung des Druckmittels bei höherer bzw. niedrigerer Temperatur gegenüber normaler Betriebstemperatur entsprechen.To compensate for the effects of temperature on the position indicator, for example in a mounted on the deck of a ship fitting in which occur between day and night temperature differences of eg 20 ° C, the display unit 6 is specified in the program that a pulse number of, for example, "five per unit time for the position indicator is disregarded, it being assumed in this example that five pulses correspond to a change in volume of the pressure medium at a higher or lower temperature compared to normal operating temperature.
Hierbei werden Erfahrungswerte dem Programm vorgegeben. Es ist aber auch möglich, im Programm z.B. Viskositätskurven des jeweiligen Druckmittels abzuspeichern, wobei in Verbindung mit Temperatursensoren eine genauere Erfassung der Volumenänderungen des Druckmittels in Abhängigkeit von der Temperatur möglich ist. Zur Kompensation der Temperatureinflüsse kann am Durchflusssensor 5 und/oder am Stellzylinder 1.2 ein Temperaturfühler vorgesehen sein, der die entsprechenden Messwerte an das Programm in der Anzeigeeinheit 6 überträgt.Here, empirical values are given to the program. But it is also possible in the program e.g. Store viscosity curves of the respective pressure medium, in conjunction with temperature sensors a more accurate detection of the volume changes of the pressure medium as a function of the temperature is possible. To compensate for the effects of temperature, a temperature sensor can be provided on the flow sensor 5 and / or on the control cylinder 1.2, which transmits the corresponding measured values to the program in the display unit 6.
Mittels der beschriebenen Vorrichtung können auch Leckagen in der hydraulischen Anlage festgestellt und an der Anzeigeeinheit 6 angezeigt werden, beispielsweise wenn in der Schließstellung der Armatur weiterhin Impulse auftreten, oder die gemessene Impulszahl nicht mehr mit derjenigen übereinstimmt, die vor Inbetriebnahme durch das Prüfprogramm als jene Impulszahl festgelegt wurde, die einem vollen Stellweg entspricht. Hierdurch wird die Betriebssicherheit durch Fehlererkennung erhöht.By means of the device described leaks in the hydraulic system can be detected and displayed on the display unit 6, for example, if in the closed position of the valve impulses continue to occur, or the measured number of pulses no longer coincides with that before commissioning by the test program as that number of pulses which corresponds to a full travel. As a result, the reliability is increased by fault detection.
Das Programm in der Anzeigeeinheit 6 kann auch zur Steuerung der Armatur in der Weise ausgebildet werden, dass am Display 6.1 eine Zwischenstellung der Armatur von beispielsweise 40 % vorgewählt werden kann, worauf dann die Steuerung durch eine der Steuertasten ausgelöst wird. Die Armatur wird danach selbsttätig in die Zwischenstellung von 40 % verfahren und bei Erreichen der Zwischenstellung in dieser Stellung gehalten. Hierbei wird das Stellventil 4.1 über die elektrischen Leitungen 6.3 so lange angesteuert, bis die vorgegebene Zwischenstellung erreicht ist, worauf durch das Programm die Spannungsversorgung des Stellventils 4.1 unterbrochen wird. Auf diese Weise dient die Anzeigeeinheit 6 auch als Steuereinheit, wobei für die Steuerung der Armatur über das Stellventil 4.1 die zuvor ermittelten Impulsdaten vom Durchflusssensor 5 vom Programm mit verarbeitet werden.The program in the display unit 6 can also be designed to control the valve in such a way that on the display 6.1 an intermediate position of the valve can be selected, for example, 40%, whereupon the control is triggered by one of the control buttons. The valve is then automatically moved to the intermediate position of 40% and held in this position when reaching the intermediate position. Here, the control valve 4.1 is controlled via the electrical lines 6.3 until the predetermined intermediate position is reached, whereupon the power supply of the control valve 4.1 is interrupted by the program. In this way, the display unit 6 also serves as a control unit, wherein for the control of the valve via the control valve 4.1, the previously determined pulse data from the flow sensor 5 are processed by the program.
Die beschriebene Anzeigevorrichtung ist nicht nur im Schiffbau von großem Vorteil, weil mit einfachen Mitteln eine präzise Stellungsanzeige erzielbar ist. Die Anzeigevorrichtung kann auch bei Industrieanlagen, beispielsweise in Raffinerien Verwendung finden. Sie ist auch bei relativ kurzen Leitungen von z.B. 20 m zwischen Steuerstelle und Armatur einsetzbar, bei denen sich die Kompressibilität durch unterschiedliche Impulszahlen zwischen druckführen- dem Vor- und drucklosem Rücklauf bemerkbar macht.The display device described is not only in shipbuilding of great advantage, because with simple means a precise position indicator can be achieved. The display device can also be used in industrial plants, for example in refineries. She is also at relatively short lines of, for example, 20 m between the control point and the fitting can be used, in which the compressibility is manifested by different numbers of pulses between the pressure-leading and unpressurized return lines.
Die Anzeigevorrichtung kann auch bei einer hydraulisch betätigten Armatur vorgesehen werden, die nur über eine Druckmittelleitung mit Druckmittel versorgt wird, wobei der mit Druckmittel beaufschlagte Kolben im Stellzylinder 1.2 gegen eine Feder arbeitet, die eine Rückstellung des Kolbens bewirkt, wenn die Druckmittelleitung auf Rücklauf geschaltet wird.The display device can also be provided in a hydraulically operated valve, which is supplied with pressure medium only via a pressure medium line, wherein the piston acted upon with pressure medium in the actuating cylinder 1.2 operates against a spring which causes a return of the piston when the pressure medium line is switched to return ,
Bei dieser Ausführungsform kann der Kolben im Stellzylinder in der Stellung mit gespannter Feder fixiert werden, sodass bei Drucklosschalten der Druckmittelleitung die durch Dekompression des Druckmittels auftretende Impulszahl gemessen werden kann, die dem Einfluss der Kompressibilität auf die Stellungsanzeige entspricht. In this embodiment, the piston can be fixed in the actuating cylinder in the position with cocked spring, so that when Drucklosschalt the pressure medium line occurring by decompression of the pressure medium pulse number can be measured, which corresponds to the influence of the compressibility on the position indicator.

Claims

Patentansprüche claims
1. Verfahren zum Anzeigen der Stellung einer hydraulisch betätigten Armatur, umfassend einen Stellzylinder (1.2) zum Betätigen der Armatur (1.1), der durch wenigstens eine Druckmittelleitung (2, 3) mit einem Stellventil (4.1) verbunden ist, durch das die Druckmittelleitung zwischen druckführendem Vorlauf und drucklosem Rücklauf umgeschaltet werden kann, dadurch gekennzeichnet, dass die Strömung durch die Druckmittelleitung in eine Zahl von elektrischen Impulsen umgewandelt wird und die die Strömung wiedergebende Impulszahl in einem Programm einer Anzeigeeinheit (6) so verarbeitet wird, dass die bei einem vorgegebenen Stellweg auftretende Impulszahl bei druckloser Strömung in der Druckmittelleitung als der gleiche Stellweg gerechnet wird, wenn die Druckmittelleitung als Druckleitung geschaltet ist.1. A method for indicating the position of a hydraulically operated valve, comprising a control cylinder (1.2) for actuating the valve (1.1), which is connected by at least one pressure medium line (2, 3) with a control valve (4.1) through which the pressure medium line between pressure-leading flow and pressure-free return can be switched, characterized in that the flow is converted by the pressure medium line into a number of electrical pulses and the flow-reflecting pulse number in a program of a display unit (6) is processed so that at a predetermined travel Occurring pulse number at no-pressure flow in the pressure medium line is calculated as the same travel when the pressure medium line is connected as a pressure line.
2. Verfahren nach Anspruch 1 , wobei das Programm selbsttätig eine Anpassung der Stellungsanzeige an das Schluckvolumen der jeweiligen Armatur vornimmt.2. The method of claim 1, wherein the program automatically performs an adjustment of the position indicator to the displacement of the respective valve.
3. Verfahren nach Anspruch 2, wobei das Programm bei jeder Inbetriebnahme der Armatur eine Überprüfung bzw. eine Anpassung der Stellungsanzeige vornimmt.3. The method of claim 2, wherein the program makes a check or adjustment of the position indicator each time the fitting.
4. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Armatur in eine erste Endstellung gefahren wird, die als Ausgangsstellung bewertet wird, aus dieser ersten Endstellung in die zweite Endstellung gefahren und die dabei auftretende Impulszahl gemessen und gespeichert wird, aus der zweiten Endstellung wieder in die erste Endstellung gefahren und die dabei auftretende Impulszahl gemessen und gespeichert wird, die beiden gemessenen Impulszahlen verglichen werden und diejenige Impulszahl für den weiteren Betrieb der Armatur als dem vollen Stellweg entsprechend vorgegeben wird, die der kleineren Impulszahl entspricht.4. The method according to any one of the preceding claims, wherein the valve is moved to a first end position, which is evaluated as the starting position, driven from this first end position to the second end position and the occurring pulse count is measured and stored, from the second end position back into the first end position is driven and the occurring number of pulses is measured and stored, the two measured pulse numbers are compared and that pulse number for the further operation of the valve is given as the full travel corresponding to the smaller number of pulses.
5. Verfahren nach einem der Ansprüche 1 bis 3, wobei die Armatur aus einer ersten Stellung in eine zweite Stellung verfahren wird und die dabei auftretenden Impulse in der als Druckleitung geschalteten Druckmittelleitung gezählt und gespeichert werden, worauf die Druckmittelleitung drucklos geschaltet wird und die bei der Dekompression des Druckmittels auftretenden Impulse gezählt und gespeichert werden, die von der zuvor ermittelten Impulszahl abgezogen werden, um die Impulszahl zu erhalten, die für den Stellweg der Armatur von der ersten Stellung in die zweite Stellung erforderlich ist.5. The method according to any one of claims 1 to 3, wherein the valve is moved from a first position to a second position and the pulses occurring in the connected as a pressure line pressure medium line are counted and stored, whereupon the pressure medium line is depressurized and at the Decompression of the pressure medium occurring pulses are counted and stored, which are deducted from the previously determined pulse count to obtain the number of pulses required for the travel of the valve from the first position to the second position.
6. Vorrichtung zur Anzeige der Stellung einer hydraulisch betätigten Armatur, umfassend einen Stellzy linder (1.2) zum Betätigen der Armatur, der wenigstens über eine Druckmittelleitung (2, 3) mit einem Stellventil (4.1) verbunden ist, durch das die Druckmittelleitung zwischen Vor- und Rücklauf umgeschaltet werden kann, dadurch gekennzeichnet, dass in der Druckmittelleitung (2) ein Durchflusssensor (5) angeordnet ist, der die Strömung des Druckmittels in der Druckmittelleitung in elektrische Impulse umwandelt, wobei der Durchflusssensor (5) mit einer elektronischen Anzeigeeinheit (6) verbunden ist, in der ein Programm zur Verarbeitung der Impulse vorgesehen ist.6. A device for indicating the position of a hydraulically operated valve, comprising a Stellzy cylinder (1.2) for actuating the valve, which is connected at least via a pressure medium line (2, 3) with a control valve (4.1) through which the pressure medium line between Vor- and return can be switched, characterized in that in the pressure medium line (2) a flow sensor (5) is arranged, which converts the flow of the pressure medium in the pressure medium line into electrical pulses, wherein the flow sensor (5) with an electronic display unit (6) in which a program for processing the pulses is provided.
7. Vorrichtung nach Anspruch 6, wobei das Programm die auftretenden Impulse zählt und die Impulszahlen vergleicht, die bei einer Strömung in der Druckmittelleitung in der einen und in der Gegenrichtung auftritt.7. The apparatus of claim 6, wherein the program counts the pulses occurring and compares the pulse counts that occurs in a flow in the pressure medium line in the one and in the opposite direction.
8. Vorrichtung nach Anspruch 6, wobei der Durchflusssensor (5) nur in einer Druckmittelleitung angeordnet ist, wenn die Armatur durch zwei Druckmittelleitungen (2.3) mit Druckmittel beaufschlagt wird. 8. Apparatus according to claim 6, wherein the flow sensor (5) is arranged only in a pressure medium line when the valve is acted upon by two pressure medium lines (2.3) with pressure medium.
EP08801637.3A 2007-09-07 2008-08-20 Method and device for indicating the position of hydraulically activated armatures Active EP2203649B1 (en)

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