EP2435713A1 - Method for removing foreign matter from a digital hydraulic pressure controller - Google Patents
Method for removing foreign matter from a digital hydraulic pressure controllerInfo
- Publication number
- EP2435713A1 EP2435713A1 EP10713637A EP10713637A EP2435713A1 EP 2435713 A1 EP2435713 A1 EP 2435713A1 EP 10713637 A EP10713637 A EP 10713637A EP 10713637 A EP10713637 A EP 10713637A EP 2435713 A1 EP2435713 A1 EP 2435713A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pressure regulator
- section
- bank
- line side
- 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
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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
-
- 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
Definitions
- the invention relates to a method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system and more particularly to a method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system of a machine for producing a fibrous web, in particular a paper or board machine.
- actuators are hydraulically driven, with which large forces can be set and exercised with high accuracy.
- a working fluid e.g. Hydraulic oil used
- a pump which pressurizes the working fluid
- a hydraulic actuator e.g. a hydraulic cylinder or hydraulic motor
- 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.
- the mobility of the spool in the valve body absolutely requires a certain clearance or gap between the control piston and the 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 hand.
- the valves themselves may be conventional solenoid valves, i. Be valves with electromagnetic drive. Of course, other forms of drive can be chosen.
- valves By connecting or installing throttle elements or by the valves themselves, it is ensured that the valves have different flow cross-sections and thus different flows when they are open; a throttle element together with a valve forms a valve device.
- a throttle element together with a valve forms a valve device.
- the flow rates Q in the individual, each of the associated valve selectively releasable flow cross-sections in the ratio of 1: 2: 4: 8 to each other; for a larger number of valves this series will continue accordingly.
- valves are either open or closed, i. To maintain a desired pressure in a closed (and unchanged) system, the valves are simply closed and there are no internal leakage flows. This is a clear difference to the conventional proportional valve, which is always flowed through by a hydraulic oil flow. This constantly costs energy for the hydraulic pumps, e.g. in the paper machine.
- a method for removing foreign substances from a digital hydraulic pressure regulator of a hydraulic system, in particular for a machine for producing a fibrous web is proposed.
- the pressure regulator has two pressure regulator sections, which can be connected to one another, for example, by an overflow valve and each of which has two valve banks.
- a plurality of individually switchable valve means is provided, each having a different flow cross-section.
- the valve means of each valve bank have stepwise mutually different flow cross-sections, ie, a flow cross-section of a valve means of a valve bank with respect to a flow cross section of another valve means the same valve bank to a predetermined amount larger or smaller.
- valve means are connected in parallel within a valve bank so as to form a parallel arrangement within a valve bank.
- a valve bank of each pressure regulator section may connect a supply line for supplying the digital hydraulic pressure regulator with a pressurized working fluid, such as hydraulic oil and the like, with a regulator output line.
- the other valve bank of the same pressure regulator section can connect the regulator outlet line with a drain line for discharging the working fluid from the pressure regulator.
- the method according to the invention has a step of connecting the two pressure regulator sections, a step of opening the valve device with the largest flow cross section of the supply line side valve bank of a pressure regulator section, a step of opening the valve device with the largest flow cross section of the drain line side valve bank of the other pressure regulator section and a step of Rinse the open flow path through the pressure regulator with the working fluid, while the remaining valve means are closed.
- the longest possible flow path is opened and rinsed by the pressure regulator with the largest possible flow cross-section, in order thereby to provide, among other things. To be able to flush out as much foreign bodies as possible from the pressure regulator.
- the method according to the invention furthermore has a step of opening the valve device with the next-smaller flow cross section of the valve Supply line side valve bank of a pressure regulator section, a step of opening the valve means with the next smaller
- the method described so far may also include a step of opening the valve device with the largest flow cross section of the supply line side valve bank of the other pressure regulator section, a step of opening the valve device with the largest flow cross section of the drain line side valve bank of a pressure regulator section and a step of purging the opened flow path through the pressure regulator with the working fluid while the remaining valve means are closed.
- the method may further include a step of opening the valve means with the next smaller flow cross section of the supply line side valve bank of the other pressure regulator section, a step of opening the Valve device with the next smallest
- the pressurized working fluid according to the inventive method is preferably stored in a pressure accumulator prior to rinsing. It is further preferable that the working fluid is pressurized by a pump.
- the method of the invention further preferably comprises a step of collecting the working fluid after the step of purging in a tank for storing pressureless working fluid.
- FIG. 1 shows a portion of a hydraulic system with a pressure accumulator, a digital hydraulic pressure regulator and a hydraulic differential cylinder in a schematic circuit diagram.
- Fig. 2 is the circuit diagram shown in Fig. 1, in which an opened flow path for flushing the pressure regulator shown in Fig. 1 is shown at a certain circuit of valves of the pressure regulator.
- Fig. 3 is the circuit diagram shown in Fig. 1, in which a flow path for venting a part of the pressure regulator shown in Figure 1 is shown in a specific circuit of valves of the pressure regulator ..;
- Fig. 4 is the circuit diagram shown in Fig. 1, in which a flow path for venting another part of the pressure regulator shown in Fig. 1 is shown at a certain circuit of valves of the pressure regulator.
- Fig. 1 shows a portion of a hydraulic system with a pressure accumulator 11, a digital hydraulic pressure regulator 4 and a hydraulic differential cylinder 3 in a schematic diagram.
- One Supply section 1 with a pump pressure accumulator 11, a pump 16 and a tank 20 supplies the pressure regulator 4 with a pressurized working fluid.
- the pressure regulator 4 has two pressure regulator sections 41, 42 for operating a differential cylinder 3.
- Sensors 19 detect by means of output lines 413, 423 the pressure in the two pressure chambers 31 and 34 of the differential cylinder 3, which are separated by a piston 33 with a piston rod 36.
- the pressure in the rod-side pressure chamber 31 acts on the rod-side piston surface 32, while the pressure in the piston-side pressure chamber 34 presses on the piston surface 35.
- each pressure regulator section 41, 42 is connected to a supply line 43, with a respective output line
- each pressure regulator section 41, 42 has a supply line side valve bank 411, 421 and a drain line side valve bank 412, 422.
- the supply-side valve bank 411, 421 connect the supply line 43 with the respective output line 413, 423.
- the drain line side valve bank 412, 422 the respective output line 413, 423 with the respective drain line
- the pressure in the pressure supply 1, from which the cylinder 3 is to be controlled, is measured by means of pressure sensor 14 and, based thereon, the target pressure in the pressure chambers 31 and 34 is set.
- At 45 is one Overflow valve referred to, which allows a connection of the two pressure chambers 31 and 34 optionally.
- the function of this spill valve 45 which can be switched to passage, separates the regulator sections 41, 42 and the pressure chambers 31, 34 from each other in the closed state. When the spill valve 45 opens, the two pressure chambers are connected or shorted together. As a rule, there is a load or force on the piston rod which tends to push the piston rod into the cylinder.
- the overflow valve 45 is opened and the control valves of the piston rod side controller section remain closed.
- the working fluid thus flows partly into the piston-side pressure chamber 31 and partly into the tank (not shown).
- the outflow into the tank is controlled by the cylinder-side regulator section 42 and thus controls the lowering speed of the piston rod.
- FIG. 2 shows a flow path opened by the method according to the invention, in which the pressurized working fluid from the pump 16 via the supply line 43 through the valve with the largest flow cross-section, in this example with a flow cross-sectional diameter of 1.5 mm, the supply line side valve bank 421 the pressure regulator section 42 is conveyed into the outlet line 423. Since the output line 423 of the pressure regulator section 42 communicates via the opened spill valve 45 with the outlet line 413 of the pressure regulator section 41, the working fluid becomes the output line 413 and further through the valve having the largest flow area, in this example a Flow cross-section diameter of 1.5mm, the drain line side valve bank 412 of the
- Pressure regulator section 41 is conveyed into the tank 20 and collected there. In this procedure, a flushing of the longest flow path is achieved with the largest possible flow cross-section of the pressure regulator 4, wherein in the flushed parts of the pressure regulator 4 existing foreign matter flushed out and thus removed from the pressure regulator 4.
- a circuit of the pressure regulator 4 for venting a first part of the pressure regulator 4 is shown in Fig. 3.
- the valve with the next smaller flow area in the supply line side valve bank 421 of the pressure regulator section 42 and the valve with the next smaller flow area of the drain line side valve bank 412 of the pressure regulator section 41 are opened.
- the working fluid is purged through the flow path formed thereby.
- the valve with the next smaller flow cross section is located in the valve arrangement shown in each of the valve banks next to the previously opened valve with the largest possible flow cross-section.
- a next method step the valve with the next smallest flow cross section in each of the active valve banks is opened and the flow path opened thereby purged, etc. These steps are repeated until all valves of the two active valve banks shown in FIG. 3 have been flushed and vented , A circuit of the pressure regulator 4 for venting the remaining part of the pressure regulator 4 is shown in Fig. 4.
- Pressure regulator section 42 is conveyed into the tank 20 and collected there. Subsequently, in the method shown in FIG. 4, the valve having the next smaller flow area in the supply line side valve bank 411 of the pressure regulator portion 41 and the valve having the next smaller flow area of the drain line side valve bank 422 of the pressure regulator portion 42 are opened. Then, the working fluid is purged through the flow path formed thereby.
- the valve with the next smaller flow cross section is located in the valve arrangement shown in each of the valve banks next to the previously opened valve with the largest possible flow cross-section. In a next method step, the valve with the next smallest flow cross-section in each of the active valve banks is opened and the flow path opened thereby purged, etc.
- valves of the pressure regulator 4 are flushed and vented.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009026608A DE102009026608A1 (en) | 2009-05-29 | 2009-05-29 | Method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system |
PCT/EP2010/054793 WO2010136253A1 (en) | 2009-05-29 | 2010-04-13 | Method for removing foreign matter from a digital hydraulic pressure controller |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2435713A1 true EP2435713A1 (en) | 2012-04-04 |
EP2435713B1 EP2435713B1 (en) | 2015-03-04 |
Family
ID=42288538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10713637.6A Not-in-force EP2435713B1 (en) | 2009-05-29 | 2010-04-13 | Method for removing foreign matter from a digital hydraulic pressure controller |
Country Status (5)
Country | Link |
---|---|
US (1) | US8920575B2 (en) |
EP (1) | EP2435713B1 (en) |
CN (1) | CN102449318B (en) |
DE (1) | DE102009026608A1 (en) |
WO (1) | WO2010136253A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009026608A1 (en) | 2009-05-29 | 2010-12-02 | Metso Paper, Inc. | Method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system |
EP2543890B1 (en) * | 2011-07-04 | 2018-09-05 | Valmet Technologies, Inc. | Safety component |
DK201270573A (en) * | 2012-02-01 | 2013-08-02 | Hydratech Ind Wind Power As | Hydraulic system primarily for pitch control |
DE102013224390A1 (en) | 2013-11-28 | 2015-05-28 | Robert Bosch Gmbh | Valve arrangement for a digital hydraulic system |
DE102013224337A1 (en) | 2013-11-28 | 2015-05-28 | Robert Bosch Gmbh | Valve arrangement for a digital hydraulic system |
DE102015221259A1 (en) * | 2015-10-30 | 2017-05-04 | Festo Ag & Co. Kg | Valve module and valve arrangement |
DE102016206821A1 (en) * | 2016-04-21 | 2017-10-26 | Festo Ag & Co. Kg | Method for operating a valve device, valve device and data carrier with a computer program |
US11067102B1 (en) * | 2020-04-13 | 2021-07-20 | Mac Valves, Inc. | Digital proportional pressure controller |
EP4174324A1 (en) * | 2021-10-29 | 2023-05-03 | Danfoss Scotland Limited | Controller and method for hydraulic apparatus |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19724447A1 (en) * | 1997-06-10 | 1998-12-17 | Buerkert Werke Gmbh & Co | Method of manufacturing digital valve arrangement to give a proportional characteristic |
FI118608B (en) * | 2001-04-23 | 2008-01-15 | Matti Linjama | Control system and method for controlling an actuator and for optimizing control by means of parallel connected valve series |
US6467264B1 (en) * | 2001-05-02 | 2002-10-22 | Husco International, Inc. | Hydraulic circuit with a return line metering valve and method of operation |
FI113794B (en) * | 2002-11-14 | 2004-06-15 | Metso Paper Inc | Method and arrangement for controlling the position and / or force of an elongated roller assembly |
DE102004006683A1 (en) * | 2004-02-11 | 2005-09-01 | Zf Friedrichshafen Ag | switching unit |
FI123590B (en) | 2005-09-06 | 2013-07-31 | Bosch Gmbh Robert | Valve system fault detection and fault tolerant control |
DE102006012008A1 (en) * | 2006-03-14 | 2007-09-20 | Robert Bosch Gmbh | Control device for rotor blade adjustment |
DE102007032964A1 (en) * | 2007-07-16 | 2009-01-22 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Device for setting an actuator |
DE102009026608A1 (en) | 2009-05-29 | 2010-12-02 | Metso Paper, Inc. | Method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system |
-
2009
- 2009-05-29 DE DE102009026608A patent/DE102009026608A1/en not_active Withdrawn
-
2010
- 2010-04-13 EP EP10713637.6A patent/EP2435713B1/en not_active Not-in-force
- 2010-04-13 WO PCT/EP2010/054793 patent/WO2010136253A1/en active Application Filing
- 2010-04-13 CN CN201080023913.5A patent/CN102449318B/en not_active Expired - Fee Related
- 2010-04-13 US US13/322,827 patent/US8920575B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2010136253A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8920575B2 (en) | 2014-12-30 |
US20120067378A1 (en) | 2012-03-22 |
CN102449318B (en) | 2014-10-29 |
WO2010136253A1 (en) | 2010-12-02 |
EP2435713B1 (en) | 2015-03-04 |
CN102449318A (en) | 2012-05-09 |
DE102009026608A1 (en) | 2010-12-02 |
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