EP2435714A1 - Procédé et dispositif de surveillance du fonctionnement d'un système hydraulique comportant un accumulateur hydraulique - Google Patents

Procédé et dispositif de surveillance du fonctionnement d'un système hydraulique comportant un accumulateur hydraulique

Info

Publication number
EP2435714A1
EP2435714A1 EP10713638A EP10713638A EP2435714A1 EP 2435714 A1 EP2435714 A1 EP 2435714A1 EP 10713638 A EP10713638 A EP 10713638A EP 10713638 A EP10713638 A EP 10713638A EP 2435714 A1 EP2435714 A1 EP 2435714A1
Authority
EP
European Patent Office
Prior art keywords
actual
duty cycle
expected
hydraulic system
supply unit
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
EP10713638A
Other languages
German (de)
English (en)
Other versions
EP2435714B1 (fr
Inventor
Juhani Toppari
Päivi RINTAMÄKI
Ville Hopponen
Arto Ikonen
Harri Kuivala
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2435714A1 publication Critical patent/EP2435714A1/fr
Application granted granted Critical
Publication of EP2435714B1 publication Critical patent/EP2435714B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40592—Assemblies of multiple valves with multiple valves in parallel flow paths
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure

Definitions

  • the invention relates to a method and a device for monitoring the function of a hydraulic system of a machine.
  • reference is mainly made to a paper or board machine, but in fact this is just one example of a variety of machines in which the method described or the apparatus described is applicable.
  • Machines of all kinds have hydraulic actuator or drive elements, which are actuated by a pressurized working fluid whose pressure and / or volume flow is regulated by regulators.
  • the hydraulics are used as actuating and control means when large forces are to be adjusted and applied with high accuracy.
  • the working fluid e.g. Hydraulic oil is pressurized by a pump and the introduction of the pressurized hydraulic oil into a hydraulic actuator, such as a hydraulic actuator.
  • a hydraulic cylinder or hydraulic motor is typically controlled by a proportional control valve or proportional valve, which may be electrically, hydraulically, or pneumatically driven.
  • Such a control valve has a slidable or displaceable spool or spool which, in response to its location in an associated valve housing, can adjust a desired pressure at the outlet by controlling the pressure of hydraulic oil delivered by the pump becomes.
  • the mobility of the control piston in the valve housing necessarily requires a certain clearance or gap between the control piston and valve housing, so that an internal leakage of the control valve is unavoidable.
  • the gap size must not be too narrow, otherwise the valve would be too susceptible to contamination in the hydraulic oil.
  • a digital hydraulic pressure regulator consists of a series of valves connected in parallel, which have only ON / OFF functions; So simple ON / OFF switching valves are that allow or interrupt a flow and can be consistently referred to in this application as valves.
  • the valves are all connected to a common supply line on the one hand and to a common output line on the other.
  • the valves themselves may be conventional solenoid valves, ie valves with electromagnetic drive. Of course, other forms of drive can be chosen.
  • valves In the digital hydraulic control, the valves are usually closed after setting the target pressure, i. to maintain a desired pressure in a closed (and unchanged) system, neither working fluid is withdrawn nor supplied to this system.
  • this steady-state condition may require or permit individual control interventions, particularly in response to changes elsewhere in the machine / control system.
  • the pump is occasionally turned on and builds up the pressure in the memory again.
  • leaks or internal leakages may occur which, however, may go unnoticed in an automatic control by means of digital hydraulic controllers because leakages are compensated, i. the pressure measurement alone does not indicate any leakage.
  • the object of the invention is to propose a method and a device with which this leakage can be reliably detected.
  • the object is achieved in terms of the method with a method according to claim 1.
  • a solution according to the invention in claim 14 is shown.
  • the hydraulic system for controlling working fluid pressures uses at least one digital hydraulic controller which extracts working fluid stored under pressure from at least one pressure accumulator.
  • the hydraulic system is provided with a supply unit which is switched on as needed to fill the pressure accumulator.
  • the actual switch-on frequency and / or switch-on duration of the supply unit is compared with an expected switch-on frequency and / or switch-on duration. From the actual EinschaltPSuftechnik the supply unit can be closed directly to the working fluid consumption. If this working fluid consumption exceeds the expected value, it can be concluded that there may be a leak.
  • the expected value for the switch-on frequency is not necessarily a fixed value, but can change in the operation of the machine by changing boundary conditions in a comprehensible manner, so that the expected value can be adjusted accordingly.
  • the supply unit can be switched on to different needs, for example, the supply unit can be turned on before an adjustment or setting process is initiated in the machine. Preferably, the supply unit is then switched on as needed when the pressure in the accumulator falls below a predetermined value.
  • a leak in the hydraulic system is concluded directly from the comparison of the actual switch-on frequency with the expected switch-on frequency if the actual switch-on frequency exceeds the expected switch-on frequency.
  • the expected switch-on frequency is preferably calculated by calculating an expected withdrawal quantity of working fluid from the pressure accumulator per unit of time and relating it to the storage volume of the pressure accumulator or the pressure accumulator.
  • the actual power-on frequency is re-detected starting every time the machine is restarted after a steady state of operation has been reached.
  • a counter which counts the number of switch-on operations of the supply unit.
  • a memory can be used which stores the counted number.
  • a computing device with a timer may be used which proportates the counted number at the time to obtain the actual turn-on frequency.
  • the computing device compares the value for the actual power-on frequency with a predetermined value and displays a message when that value is exceeded.
  • the message may be particularly conspicuous, e.g. If necessary, an optical and / or acoustic alarm can be output if the specified switch-on frequency is exceeded.
  • the method is also applicable to a hydraulic system having a plurality of supply units, wherein preferably the individual supply units are each monitored with regard to the switch-on frequency.
  • the inventive method also includes an additional or alternative detection of the duty cycle of the supply unit. From the actual duty cycle of the supply unit can be closed directly to the working fluid consumption. This working fluid consumption exceeds the expected Value, it can be concluded that there may be a leak.
  • the expected value for the duty cycle is not necessarily a fixed value, but can change in the operation of the machine by changing boundary conditions in a comprehensible manner, so that the expected value can be adjusted accordingly.
  • the supply unit can be switched on to different needs, for example, the supply unit can be turned on before an adjustment or setting process is initiated in the machine. Preferably, the supply unit is then switched on as needed when the pressure in the accumulator falls below a predetermined value.
  • a leak in the hydraulic system is immediately deduced from the comparison of the actual duty cycle with the expected duty cycle when the actual duty cycle exceeds the expected duty cycle.
  • the expected switch-on duration is preferably calculated by calculating an expected removal quantity of working fluid from the pressure accumulator and relating it to the delivery rate of the supply unit.
  • the duty cycle monitored here is the accumulated duty cycle of the utility.
  • the actual flow rate of the supply unit with the expected flow rate of the supply unit is compared, so that an excessive flow rate can be closed to a fault in the hydraulic system.
  • the machine In paper machines sometimes it comes to web breaks. After such a web break, the machine must be restarted.
  • the actual duty cycle is re-detected starting every time the machine is restarted after reaching a steady state of operation.
  • a counter which detects the duration of the switch-on operations of the supply unit.
  • a memory can be used which stores the detected power-on events and adds their durations.
  • a computing device compares the sum to a predetermined value or expectation value and displays a message if that value is exceeded.
  • the message may be particularly conspicuous, e.g. If necessary, an optical and / or acoustic alarm can be output if the preset duty cycle is exceeded.
  • the method is also applicable to a hydraulic system having a plurality of supply units, wherein preferably the individual supply units are each monitored with respect to the duty cycle.
  • a device for monitoring the operation of a hydraulic system of a machine wherein the hydraulic system for controlling working fluid pressures has at least one digital hydraulic controller which is connected to at least one pressure accumulator, in which working fluid can be stored under pressure.
  • a supply unit is provided to fill the accumulator.
  • the device further has a counting and computing device which is designed to have an actual switch-on frequency and / or switch-on duration of the switch-on time Supply unit and with an expected in the counting and computing device expected
  • Switch-on frequency and / or duty cycle to compare.
  • a display device is provided to output an optical and / or acoustic signal when the actual switch-on frequency and / or switch-on duration exceeds the expected switch-on frequency and / or switch-on duration.
  • This display can be a screen display in a machine control room, but it can also be provided an alarm triggering attention attentively on the machine or in the machine control room visually and / or acoustically indicates the malfunction.
  • Fig. 1 shows an application of the method according to the invention.
  • Fig. 2 shows an application of digital hydraulic control technology.
  • Fig. 3 shows a further application of digital hydraulic control technology.
  • a pair of differential cylinders 1 is provided according to FIG.
  • Each pressure chamber; So piston-side pressure chamber and rod-side pressure chamber of each differential cylinder 1 is provided with its own digital hydraulic pressure regulator 2.
  • a supply unit 3 at the bottom left in Fig. 1 has a pump 31 with a motor, a tank 32 and a pressure accumulator 33, which can be filled with the help of the pump 31 under pressure, that can be charged.
  • a monitoring device 4 which is here shown for the sake of clarity as a separate unit, but in practice may also be provided in the control unit of the pressure regulator, is able to detect switching on and off of the pump 33.
  • a counting device (not shown) is realized, which can detect the switching-on frequency and / or the duration of the pump operation. This detected or actual value may be provided with a predetermined expectation value in one provided in the monitoring device 4
  • Comparator (not shown) are compared. If the comparison shows that the supply unit has to be operated more often or longer than is to be expected by the operation, then an error in the hydraulic system, e.g. be closed on a leak.
  • the monitoring device 4 is designed to issue a display or a visual or audible alarm by means of a display device and / or an alarm device (not shown) if it can be concluded that a fault has occurred in the hydraulic system.
  • Fig. 2 shows a cooling device which is applicable, for example, to a hydraulic system which can use the invention.
  • FIG. 2 shows a hydraulic circuit 5 which contains a tank 51, a pump 52, an optional pressure accumulator 54, a filter 7 and a heat exchanger 53.
  • the branch to a hydraulic load is not shown in Fig. 2.
  • a cooling water circuit with the heat exchanger 53 and the supply line 62 and the drain line 63 includes a controller 6, which is constructed as a digital hydraulic controller, as previously described in detail.
  • the controller 6 is used in the present case for flow control in the cooling water flow. By opening one or more valves simultaneously in the controller 6, the volume flow of the cooling water through the controller 6 can be set well.
  • As a reference variable for the controller 6 can serve the temperature of the hydraulic oil in the tank 51, which is detected by a sensor 61.
  • the hydraulic oil releases its heat to the cooling water, wherein with the cooling water flow, the amount of heat dissipated is adjustable.
  • a pressure accumulator 54 is shown in the hydraulic circuit 5, which can also be omitted.
  • the hydraulic circuit 5 may also be a lubricant circuit which serves to supply to be lubricated points in the machine.
  • digital hydraulic controllers as pressure regulators or as flow regulators, in particular in paper machines or the like, are also conceivable.
  • Such digital hydraulic controllers are described in this description previously in connection with liquids as a pressure regulator and as a flow regulator. With the same construction and functionality However, these regulators can also be used as flow regulators or as pressure regulators for gases.
  • a digital hydraulic controller to control the flow of compressed air into an eddy current generator (also called a vortex generator or vortex tube) is proposed.
  • eddy current generators are used to generate cold air and are operated with compressed air.
  • the air consumption of these generators is relatively high and the flow rate is usually manually adjusted by a handwheel until the cold air is obtained at the desired temperature and in the desired amount at the output of the eddy current generator.
  • a possible use of the digital hydraulic controller as a pressure regulator for controlling the pressure of gases is given, for example, in the control of adjusting hoses.
  • Valve hoses are used, for example, to set a squeegee, or to keep in an operating position.
  • the force with which the doctor acts on, for example, a paper web must be controlled very precisely.
  • a regulator should already be sufficient, which has three to six parallel switching valves.
  • control hoses are often pneumatically operated, ie operated with compressed air.
  • the regulation of the pressure in such a control tube has hitherto usually been done by manually adjustable throttles, combined with ejectors and electromagnetic switching valves.
  • manually adjustable throttles combined with ejectors and electromagnetic switching valves.
  • FIG. 3 another application of the digital hydraulic control is shown. This application concerns the cooling of rotary joints with digital hydraulic technology.
  • Fig. 3 an arrangement with two metal band calenders 7 is shown, to which, as described herein, the digital hydraulic control technique is applied.
  • the metal belt calenders 7 are operated at high temperatures, so that cooling of the rotary joints is required.
  • the cooling points are indicated by 71 in FIG. 3.
  • the digital hydraulic control requires only a pressure measurement and a temperature measurement of the oil flowing into the supply unit 3.
  • the switching valves can be embedded in a system simulation "Simulink" and only be run as control valves without feedback
  • the typical flow is 6 to 9 l / min at oil temperatures of 70 to 75 0 C.
  • the oil is thin at these temperatures anyway, so that the Temperature switches as safety devices can also be additionally present on the rotary joints.
  • the digital hydraulic controller which has been explained in this application corresponds in its operation to the previously described in detail regulators.
  • the insensitivity to dirt and the flushability by the simple robust construction also form an advantage for the digital hydraulic controller in this application. It is e.g.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention propose un procédé de surveillance du fonctionnement d'un système hydraulique d'une machine, en particulier d'une machine de fabrication d'une bande de matière fibreuse, par exemple une machine de fabrication de papier ou de carton. Pour réguler les pressions des fluides de travail, le système hydraulique utilise au moins un régulateur hydraulique numérique (2) qui prélève du fluide de travail stocké sous pression d'au moins un accumulateur de pression (33). Le système hydraulique est doté d'une unité d'alimentation (3) qui est reliée au système selon les besoins pour remplir l'accumulateur de pression (33). Dans le procédé de surveillance, la fréquence et/ou la durée réelle(s) de liaison au système de l'unité d'alimentation (3) est/sont comparée(s) à une fréquence et/ou une durée théorique(s) de liaison au système. Si la fréquence et/ou la durée réelle(s) de liaison au système de l'unité d'alimentation dépasse(nt) la fréquence et/ou la durée théorique(s) de liaison au système, on peut conclure à la présence d'un défaut dans le système hydraulique. L'invention a également pour objet un dispositif pour mettre en oeuvre le procédé.
EP10713638.4A 2009-05-29 2010-04-13 Procédé de surveillance du fonctionnement d'un système hydraulique d'une machine a papier ou a carton, le système hydraulique comportant un accumulateur hydraulique Not-in-force EP2435714B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910026607 DE102009026607A1 (de) 2009-05-29 2009-05-29 Verfahren und eine Vorrichtung zur Funktionsüberwachung eines Hydrauliksystems einer Maschine
PCT/EP2010/054794 WO2010136254A1 (fr) 2009-05-29 2010-04-13 Procédé et dispositif de surveillance du fonctionnement d'un système hydraulique comportant un accumulateur hydraulique

Publications (2)

Publication Number Publication Date
EP2435714A1 true EP2435714A1 (fr) 2012-04-04
EP2435714B1 EP2435714B1 (fr) 2018-08-22

Family

ID=42315383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10713638.4A Not-in-force EP2435714B1 (fr) 2009-05-29 2010-04-13 Procédé de surveillance du fonctionnement d'un système hydraulique d'une machine a papier ou a carton, le système hydraulique comportant un accumulateur hydraulique

Country Status (3)

Country Link
EP (1) EP2435714B1 (fr)
DE (1) DE102009026607A1 (fr)
WO (1) WO2010136254A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018211714A1 (de) * 2018-07-13 2020-01-16 Sms Group Gmbh Verfahren zum Condition Monitoring eines Hydrauliksystems einer Metallumformungsanlage sowie condition-Monitoring-Vorrichtung
CN112963406B (zh) * 2021-03-31 2023-06-02 上海电气集团股份有限公司 一种液压系统的监测方法、装置、系统和存储介质

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227265A1 (de) * 1982-07-21 1984-01-26 Alfred Teves Gmbh, 6000 Frankfurt Ueberwachungseinrichtung fuer die energieversorgung einer druckmittelbetaetigten anlage
DE3227264A1 (de) * 1982-07-21 1984-01-26 Alfred Teves Gmbh, 6000 Frankfurt Anordnung zur ueberwachung einer druckmittelbetaetigten anlage
DE3303549C1 (de) * 1983-02-03 1984-03-22 Daimler-Benz Ag, 7000 Stuttgart Pneumatik- oder Hydraulikanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010136254A1 *

Also Published As

Publication number Publication date
DE102009026607A1 (de) 2010-12-02
EP2435714B1 (fr) 2018-08-22
WO2010136254A1 (fr) 2010-12-02

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