EP0115337A2 - Procédé et dispositif pour régler la vitesse d'un entraînement pneumatique - Google Patents

Procédé et dispositif pour régler la vitesse d'un entraînement pneumatique Download PDF

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Publication number
EP0115337A2
EP0115337A2 EP84100782A EP84100782A EP0115337A2 EP 0115337 A2 EP0115337 A2 EP 0115337A2 EP 84100782 A EP84100782 A EP 84100782A EP 84100782 A EP84100782 A EP 84100782A EP 0115337 A2 EP0115337 A2 EP 0115337A2
Authority
EP
European Patent Office
Prior art keywords
drive unit
speed
pressure medium
piston
during
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.)
Withdrawn
Application number
EP84100782A
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German (de)
English (en)
Other versions
EP0115337A3 (fr
Inventor
Richard Herbst
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0115337A2 publication Critical patent/EP0115337A2/fr
Publication of EP0115337A3 publication Critical patent/EP0115337A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08Servomotor systems incorporating electrically operated control means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30525Directional control valves, e.g. 4/3-directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/32Directional control characterised by the type of actuation
    • F15B2211/327Directional control characterised by the type of actuation electrically or electronically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/665Methods of control using electronic components
    • F15B2211/6654Flow rate control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7052Single-acting output members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75Control of speed of the output member

Definitions

  • the invention relates to a method and a device for the controlled changing of the speed of a drive unit operated with a gaseous pressure medium, in particular with compressed air.
  • Piston cylinder units operated with a gaseous pressure medium
  • a gaseous pressure medium e.g. Piston cylinder units, compressed air motors, swivel drives or the like
  • piston-cylinder units usually consist of a gas-tight cylinder and a piston guided in the cylinder, which is firmly connected on one or both sides to a piston rod.
  • the piston rod passes through an opening in the cylinder base.
  • Piston-cylinder units of this type are drive units which are standardized and are widely used.
  • the movement of the piston is generated by the gaseous pressure medium, which can flow into the cylinder via inlet openings arranged in the cylinder wall and act on the free piston surface.
  • the pressure medium flows out of the cylinder space again via outlet openings in the cylinder wall when the drive of the piston has ended.
  • the speed of the piston depends on the outflow and / or inflow speed of the pressure medium applied. In the case of unchangeable constructions, the inflow speed depends on the pressure of the pressure medium.
  • a pneumatic drive element is required to operate at different speeds. It is known for this purpose to arrange an adjustable throttle device in the exhaust air line, with which e.g. the piston speed can be regulated. However, such a facility does not work satisfactorily because. an exact position and / or change in the piston speed is not possible.
  • a control device for feeding the print medium is also known. Such control devices ensure more precise control of the piston speed, but are technically very complex.
  • the object of the invention is to provide a method and a device with which different speeds can be set very precisely in a pneumatically operated drive unit.
  • This object is achieved according to the invention by a method for adjusting the speed of a drive unit operated with a gaseous pressure medium, in particular with compressed air, in that the gaseous pressure medium is pulsed and / or discharged into the drive unit at least temporarily, preferably during the entire work process becomes.
  • Pulsating in the sense of the invention means that the gaseous pressure medium during e.g. of the piston stroke does not flow continuously into the cylinder chamber, but the flow briefly several times, i.e. interrupted at certain frequencies and / or the flow velocity is changed at certain frequencies.
  • FIG. 1 and 3 show graphically and * pulsating feeds to the pressure medium.
  • the ordinate represents the amount of gas Q flowing into the cylinder and the abscissa the inflow time t.
  • curve A a certain amount of gas of a gas under a certain pressure flows in time t 1 into a cylinder, for example, and sets the piston the piston-cylinder unit in motion. Then the gas supply is stopped for the period T l . This ensures that the speed reached by the piston is not increased. A new pulse-like gas surge is then put back into the cylinder, which lasts the time t 2 and ensures that the piston maintains its speed until the time t KH - the time for the complete piston stroke - is reached.
  • the times T and t are chosen such that a certain piston speed results.
  • the time t can be longer or shorter than the time T.
  • the time t 1 can be chosen longer or shorter than the time t 2 , ie the Times * for example,
  • t 1 to t x can be varied, as can the times T 1 to T, as a result of which speed increases (accelerations) and / or reductions (delays) can also be generated during the stroke.
  • end position damping of the piston can be ensured according to the invention, which previously could only be achieved with particularly complex devices on the bottom of the cylinder.
  • Fig. 2 shows schematically the reduction in speed by the pulsating feeding of the gaseous pressure medium according to the invention.
  • the ordinate indicates the speed V of the piston, for example, and the abscissa the time t of the piston movement during a stroke.
  • the curve V 1 illustrates the speed that results when the pressure medium flows in continuously.
  • Curve V 2 represents the speed which arises due to the pulsating feeding of the gaseous pressure medium according to FIG. 1. Due to the pulsating feeding, the speed of the piston can fluctuate somewhat, which is indicated in curve V 2 by the wave-shaped representation of the speed curve. It has been shown that the fluctuations can be limited by precise tuning of the pulsation frequency so that they are ineffective.
  • the pulsating feeding can also take place in such a way that different amounts of gas are introduced into the cylinder for a limited time.
  • Curve B in FIG. 1 illustrates this method variant.
  • the times T and t can also be varied as described above.
  • a device for performing the method according to the invention has e.g. a pneumatically operated piston-cylinder unit which is combined with at least one electrically actuated pneumatic valve known per se, the valve being connected to a programmable logic controller known per se.
  • the combination of a piston-cylinder unit with an electrically operated pneumatic valve is known.
  • the gaseous pressure medium is fed into the cylinder via the valve, a control device giving an electrical impulse to open the valve until the piston stroke is carried out.
  • the gaseous pressure medium flows continuously into the cylinder.
  • the present invention provides to use a known electrically operated pneumatic valve directly for setting the speed of a drive unit and to select a control for the valve which transmits brief electrical impulses to the valve, for example in the range from 5 to 100 ms, so that the Valve, for example corresponding to the times T and t in Fig. 1, curve A, opens and closes or partially closes according to curve B in Fig. 1, so that a small valve opening remains open.
  • electrical switching pulses are accordingly transmitted to the valve during a piston stroke, which are shown schematically in FIG. 3.
  • the valve is closed during times T and opened during times t.
  • the the opening and closing times can be varied, which is indicated, for example, by the different times T and t in curves C, D and E in FIG.
  • a suitable control device for an electrically operated pneumatic valve is - as already mentioned - a programmable control device known per se which is used to emit the desired pulse sequence, e.g. 3, is programmed.
  • the ordinate represents the pulse I and the abscissa the time t.
  • FIG 4 schematically shows the device according to the invention for carrying out the method according to the invention.
  • the piston-cylinder unit 1 is connected via a compressed air line 2 to the electrically operated solenoid valve 3, which is electrically, i.e. with an electrical cable 4, is connected to a programmable logic controller 5.
  • the valve is also connected to a compressed air source 6.
  • a programmable logic controller suitable for the purpose of the invention is described, for example, in the prospectus of the company IPC-ISSC-Pulsotronic Merten GmbH & Co. KG, Kaiserstrasse 150, D-5270 Gummersbach 1. It is the programmable logic controller ipc 90.
  • the valve version with the designation MC-5 / 4-1 / 4 is an example valve for the control of the cylinder with a blocked middle position and optional control for the cylinder supply and return.
  • the magnet Valve with the designation MC-3-3 / 4-S is suitable for controlling one cylinder side. When using two such valves, the individual valves can be controlled independently of one another.

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  • 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)
EP84100782A 1983-01-25 1984-01-25 Procédé et dispositif pour régler la vitesse d'un entraínement pneumatique Withdrawn EP0115337A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3302403 1983-01-25
DE19833302403 DE3302403A1 (de) 1983-01-25 1983-01-25 Verfahren und vorrichtung zur stellung der geschwindigkeit einer mit einem gasfoermigen druckmedium betriebenen antriebseinheit

Publications (2)

Publication Number Publication Date
EP0115337A2 true EP0115337A2 (fr) 1984-08-08
EP0115337A3 EP0115337A3 (fr) 1984-09-05

Family

ID=6189160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100782A Withdrawn EP0115337A3 (fr) 1983-01-25 1984-01-25 Procédé et dispositif pour régler la vitesse d'un entraínement pneumatique

Country Status (2)

Country Link
EP (1) EP0115337A3 (fr)
DE (1) DE3302403A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668557A1 (fr) * 1990-10-26 1992-04-30 Pierburg Gmbh Procede pour la commande d'un organe de manóoeuvre, ou verin, electropneumatique.
FR2738040A1 (fr) * 1995-08-24 1997-02-28 Charmois Claude Dispositif pour la regulation de la vitesse de l'organe d'actionnement d'un actionneur pneumatique
WO1998015741A1 (fr) * 1996-10-09 1998-04-16 Fisher Controls International, Inc. Positionneurs de vanne de commande presentant des caracteristiques de fonctionnement ameliorees
DE102007020321A1 (de) * 2007-03-16 2008-09-18 Voith Turbo H + L Hydraulic Gmbh & Co. Kg Pneumatikregeleinrichtung und Verfahren hierfür

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116107A (ja) * 1984-11-09 1986-06-03 Hitachi Ltd アクチユエ−タの制御装置
DE3621526A1 (de) * 1986-06-27 1988-01-14 Scharnofske Helmut Dr Elektro-pneumatische oder -hydraulische regelungseinrichtung fuer ein pneumatisch oder hydraulisch betaetigtes stellglied
DE3711961A1 (de) * 1987-04-09 1988-10-20 Rexroth Mannesmann Gmbh Proportionalventil-system sowie verwendung eines kugelschaltventils als proportionalventil
DE3834201A1 (de) * 1988-04-22 1989-11-02 Rexroth Mannesmann Gmbh Anordnung zum zufuehren von druckmittel zu hydraulischen verbrauchern

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955576A (en) * 1956-08-13 1960-10-11 Cleveland Pneumatic Ind Inc Exhaust pressure control system
GB2013808A (en) * 1978-02-04 1979-08-15 Bosch Gmbh Robert Anti-skid braking systems
FR2462314A1 (fr) * 1979-07-26 1981-02-13 Knorr Bremse Gmbh Circuit de reglage de la force de freinage a protection contre l'enrayage pour vehicules sur rails
DE3104704A1 (de) * 1981-02-10 1982-08-26 Per Henrik Gösta 59030 Borensberg Nyström "servovorrichtung"
US4373697A (en) * 1980-12-29 1983-02-15 Caterpillar Tractor Co. Pulse width modulated constant current servo driver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955576A (en) * 1956-08-13 1960-10-11 Cleveland Pneumatic Ind Inc Exhaust pressure control system
GB2013808A (en) * 1978-02-04 1979-08-15 Bosch Gmbh Robert Anti-skid braking systems
FR2462314A1 (fr) * 1979-07-26 1981-02-13 Knorr Bremse Gmbh Circuit de reglage de la force de freinage a protection contre l'enrayage pour vehicules sur rails
US4373697A (en) * 1980-12-29 1983-02-15 Caterpillar Tractor Co. Pulse width modulated constant current servo driver
DE3104704A1 (de) * 1981-02-10 1982-08-26 Per Henrik Gösta 59030 Borensberg Nyström "servovorrichtung"

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668557A1 (fr) * 1990-10-26 1992-04-30 Pierburg Gmbh Procede pour la commande d'un organe de manóoeuvre, ou verin, electropneumatique.
FR2738040A1 (fr) * 1995-08-24 1997-02-28 Charmois Claude Dispositif pour la regulation de la vitesse de l'organe d'actionnement d'un actionneur pneumatique
WO1998015741A1 (fr) * 1996-10-09 1998-04-16 Fisher Controls International, Inc. Positionneurs de vanne de commande presentant des caracteristiques de fonctionnement ameliorees
US5950668A (en) * 1996-10-09 1999-09-14 Fisher Controls International, Inc. Control valve positioners having improved operating characteristics
DE102007020321A1 (de) * 2007-03-16 2008-09-18 Voith Turbo H + L Hydraulic Gmbh & Co. Kg Pneumatikregeleinrichtung und Verfahren hierfür

Also Published As

Publication number Publication date
DE3302403A1 (de) 1984-07-26
EP0115337A3 (fr) 1984-09-05

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