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EP0591614A1 - Vérin - Google Patents

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Publication number
EP0591614A1
EP0591614A1 EP93107873A EP93107873A EP0591614A1 EP 0591614 A1 EP0591614 A1 EP 0591614A1 EP 93107873 A EP93107873 A EP 93107873A EP 93107873 A EP93107873 A EP 93107873A EP 0591614 A1 EP0591614 A1 EP 0591614A1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
cylinder
markings
unit according
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
EP93107873A
Other languages
German (de)
English (en)
Other versions
EP0591614B1 (fr
Inventor
Kurt Dipl.-Ing. Stoll
Lothar Müller
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP0591614A1 publication Critical patent/EP0591614A1/fr
Application granted granted Critical
Publication of EP0591614B1 publication Critical patent/EP0591614B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
    • F15B15/1419—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston of non-circular cross-section
    • 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
    • F15B15/2846—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod
    • 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
    • F15B15/2853—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using potentiometers

Definitions

  • the invention relates to a piston-cylinder unit, with a piston rod protruding from the cylinder on at least one end face, and with means for determining the position of the piston rod and / or the piston connected to it and arranged in the cylinder.
  • the most common measure to determine the position of the piston and / or the piston rod in piston-cylinder units is to arrange a permanent magnet on the piston, which can actuate a sensor fixed on the outside of the circumference of the cylinder without contact due to its magnetic field.
  • the attachment of the permanent magnet to the piston is, however, relatively complex and often requires special sealing measures.
  • the sensor arranged on the outside of the cylinder causes an increase in the overall width of the cylinder and impairs its fastening options.
  • the piston rod has on the circumference at least one supporting surface which extends over a large part of its length and has a flat shape and on which a measuring section which extends in the longitudinal direction of the piston rod and is optically or electrically interrogable is fixedly arranged.
  • An at least partially flattened piston rod is therefore used as a carrier for a suitable measuring section.
  • a precise interrogation or reading of the measuring section is possible.
  • an anti-rotation lock is achieved so that the measuring section always assumes the same angular position with respect to the cylinder. Since the measuring section is simply attached to the piston rod from the outside, the prerequisites for economical manufacture are met.
  • a square rod as the piston rod, one or more wings being formed by a corresponding number of the four rod surfaces arranged on the circumference. If necessary, you can have several measuring sections Attach to the piston rod offset in the circumferential direction. If the square bar is rectangular in cross-section and in particular square, the manufacture is particularly simple and, at the same time, optimum support is obtained in the penetration area of the associated cylinder cover. The bar edges can be rounded.
  • a measuring section which is particularly simple in terms of production technology and can also be queried in an uncomplicated manner is composed of a plurality of markings which follow one another in the longitudinal direction of the piston rod and which can be designed in the manner of scale marks.
  • a direct visual reading by an observer is possible as well as the use of an optical sensor, which is able to register the advancing markings and which is fixed in particular on the cylinder cover penetrated by the piston rod.
  • the markings or scale lines can in particular have been mechanically incised and / or etched into the wing and / or introduced by laser radiation. These are extremely fine surface depressions that do not cause any leaks or wear of existing sealing devices in the penetration area of the assigned cylinder cover.
  • a resistance strip can also be provided as the measuring section be, which extends along the wing and either placed on this and it is embedded in. It is acted upon by a sliding contact arranged fixed to the cylinder, so that an electrical change in resistance due to the displacement of the resistance strip can be registered and allows conclusions to be drawn about the current piston rod position.
  • the exemplary embodiments of both figures include a cylinder 1 in which a piston 2 (not shown in more detail in FIG. 1) is accommodated in an axially displaceable manner.
  • a piston rod 3 On the piston 2 is a piston rod 3, which extends in the longitudinal direction of the cylinder and penetrates a cylinder cover 4, which closes one end of the cylinder 1. In principle, it can be a continuous piston rod which then also penetrates the second cylinder cover 5 (not shown).
  • connection openings 8 open, which in a manner known per se allow the supply and / or discharge of pressure medium in order to move the piston 2 together with the piston rod 3 back and forth in the axial direction 12.
  • This is a pneumatic unit that is operated with compressed air.
  • Both piston-cylinder units shown in the figures are therefore equipped with means 13 for determining the position of the piston rod.
  • a measuring section 14 which can be detected optically or electrically. It extends in the longitudinal direction 12 of the piston rod 3 and is fastened to a support surface 15 formed on the piston rod 3.
  • the wing 15 thus practically forms a support for the measuring section 14 and extends along the piston rod 3 over at least a large part of its length. It is characterized in that it has a flat shape and is therefore not, as is usual with piston rods, provided with a rounded contour.
  • the supporting surface 15 extends over the entire length of the piston rod 3 as far as the piston 2, for example.
  • the measuring section 14 can also extend over this entire length, but is somewhat shorter in the exemplary embodiment, so that it ends at a short distance in front of both the fastening device 16 and the piston 2. In any case, it should expediently be so long that it extends at least approximately over the entire length of the piston rod section located outside the cylinder cover 4 when the piston rod 3 is fully extended.
  • the piston rod 3 is expediently designed as a polygonal rod, which in the case of the exemplary embodiments is a square rod which has a square cross section.
  • the wing 15 is formed by one of the four outer flat rod surfaces.
  • the measuring section 14 is composed of a plurality of markings 18 which follow one another in the longitudinal direction 12 of the piston rod 3 at a distance. These are preferably line-like markings 18, which each run transversely to the longitudinal direction 12 of the piston rod 3, so that the measuring section 14 represents a type of scale. This can easily be read visually by an observer during operation in order to find out the current relative position between the piston rod 3 and the cylinder 1. It is expedient if there is a cylinder-fixed reference edge 19 on which the markings 18 are moved past and which enables an exact reproducible reading. In the exemplary embodiment according to FIG. 1, such a reference edge 19 is formed directly by a body edge of the cylinder cover 4, specifically where the opening 17 opens out axially. The reference edge 19 is thus the end edge of the cylinder cover 4 in the passage area of the piston rod 3.
  • an optical sensor 22 indicated by dash-dotted lines in FIG. 1, which is expediently located outside the cylinder 1.
  • it sits on the end face of the cylinder cover 4 assigned to the piston rod 3. It protrudes over the wing 15 and is designed such that it can read and / or count the markings 18 that have passed.
  • Each marker 18 that is moved past triggers an electrical pulse that arrives at an evaluation unit 24 via a signal line 23.
  • the signals are evaluated there so that, for example, an optical display of the current position and the distance covered is possible. It goes without saying that the signals obtained can be used as desired.
  • a particularly simple and low-wear construction results if the markings 18 are incised in the piston rod 3. This can be done using suitable sharp-edged tools. However, it is also possible to introduce these markings into the wing 15 by etching or by means of laser beams. In front All of the latter two measures ensure that the depth of marking is very small. Optimal readability is thereby achieved while avoiding sealing problems in the penetration area 17 of the cylinder cover 4. The depths of the mark are so small that a sealing device arranged there is not damaged. Leaks are excluded, since the depressions run transversely, so that there is no connection between the surroundings and the cylinder space 7 adjoining on the inside.
  • the measuring section 14 is in the form of an electrical resistance strip 25.
  • This is glued to the piston rod 3, for example, which has been found to be the best of the possible fixed connection types.
  • the resistance strip 25 can be raised on the wing 15.
  • the seal in the penetration area of the cylinder cover 4 can, however, be handled much better if, as can be seen in FIG. 2, it comes to lie sunk in the wing 15.
  • the wing 15 has a longitudinal groove 26 of suitable depth, in which the resistance strip 25 is inserted.
  • the outward-facing surface of the resistance strip 25 forms a sliding surface 27, which preferably merges flush with the adjacent surface regions of the supporting surface 15.
  • the resistance strip 25 is opposite in the exemplary embodiment the piston rod 3 is electrically insulated, which in the present case consists of an electrically conductive material such as aluminum material or steel.
  • the insulation is carried out, for example, by interposing a stored insulation layer 30. Only with one of its two axial end regions, in the present case the end region 28 lying outside the cylinder 1, is the resistance strip 25 in an electrically conductive connection with the piston rod 3.
  • the connection point is indicated at 29.
  • a first sliding contact 32 is provided, which is fastened in an insulated manner to the cylinder 1 and, in particular, is seated on an axial projection 39 of the cylinder cover 4 that surrounds the piston rod 3.
  • the sliding contact 32 is on the one hand under resilient prestress in contact with the sliding surface 27. On the other hand, it is connected via an electrical line 33 to an evaluation unit 34.
  • a second sliding contact 35 is also mounted on the cylinder cover 4 in an electrically insulated manner and is in spring-loaded prestress in contact with a section of the piston rod 3 located next to the resistance strip 25 is not used as wings. It makes sense to use the rod surface 36 diametrically opposite the support surface 15 as the contact surface for the second sliding contact 35.
  • the second sliding contact 35 is also connected to the evaluation unit 34 via an electrical line 33 '.
  • the electrical resistance of the resistance strip 25 is chosen so that that of the piston rod 3 and also the contact resistance to the sliding contacts 32, 35 are negligible. Now a voltage is applied to the two electrical lines 33, 33 ', which generates a current flow. The current flows from the electrical line 33 'to the second sliding contact 35, from there to the piston rod 3 and in this to the connecting point 29, further along the resistance strip 25 to the contact point 37 of the first sliding contact 32, and then via this first sliding contact 32 and the electrical line 33 back to the evaluation unit 32, where the voltage source is located.
  • the relevant electrical resistance, which is generated by the resistance strip 25, is decisive for the current strength. This is determined by the axial length of the strip section 38 currently lying between the connection point 29 and the contact point 37 of the first sliding contact 32.
  • the strip section 38 is longer the further the piston rod 3 is extended, and accordingly the electrical resistance increases, which can be registered in the evaluation unit 35 as a current change.
  • the two sliding contacts 32, 35 grind along the sliding surface 27 and along the rod surface 36.
  • the evaluation unit 34 is able to determine the current position and / or the distance traveled by the piston rod 3 in relation to the cylinder 1 also display. Depending on certain values, further switching functions can then also be triggered.
  • the described potentiometer measuring principle would also work if the connection point 29 is moved to the axially inner end of the resistance strip 25.
  • the sliding contacts 32, 35 used according to the example are resilient metal sheets which, starting from the cylinder cover 4, run obliquely outwards axially and at the same time in the direction of the piston rod 3. It would also be conceivable to use sliding contacts which are pressed exactly radially against the piston rod 3 or the resistance strip 25 and in particular are under the pretension of a spring arrangement. It would be possible to integrate these sliding contacts in the axial projection 39 provided according to the example and coaxially surrounding the piston rod 3 on the outside of the cylinder cover 4.
  • the piston rod 3 would be provided with an axially extending cavity 40 which is open towards the cylinder cover 5.
  • a contact rod 41 which is attached to this cylinder cover 4 in a particularly insulated manner, then projects axially into the cavity 40 and carries a sliding contact 35 ′, which is in an electrically conductive sliding connection with that formed by the piston rod 3 Wall of the cavity 40 is.
  • the electrical connection between the contact rod 41 and the evaluation unit 34 is established via an electrical line 33 ′′ indicated by a dot-dash line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)
EP93107873A 1992-07-24 1993-05-14 Vérin Expired - Lifetime EP0591614B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9209980U DE9209980U1 (de) 1992-07-24 1992-07-24 Kolben-Zylinder-Aggregat
DE9209980U 1992-07-24

Publications (2)

Publication Number Publication Date
EP0591614A1 true EP0591614A1 (fr) 1994-04-13
EP0591614B1 EP0591614B1 (fr) 1996-12-27

Family

ID=6881996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107873A Expired - Lifetime EP0591614B1 (fr) 1992-07-24 1993-05-14 Vérin

Country Status (2)

Country Link
EP (1) EP0591614B1 (fr)
DE (2) DE9209980U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941813A1 (fr) * 1998-03-10 1999-09-15 Novartec AG Outil de presse et procédé pour sertir les raccords de tubes
EP0941812A1 (fr) * 1998-03-10 1999-09-15 Novartec, Ltd. Dispositif de vérin avec une pompe à fluide et un outil de presse
CN100342143C (zh) * 2004-07-22 2007-10-10 杨世祥 一种双级螺旋内反馈数字流体缸
EP2042412A2 (fr) 2007-09-26 2009-04-01 BPW Bergische Achsen KG Elément d'actionnement pour système de relevage d'axe et ensemble de rééquipement pour éléments d'actionnement du système de relevage d'axe
WO2009053812A3 (fr) * 2007-10-22 2009-07-02 A M A S P A Système pour déterminer la position d'un piston le long de sa trajectoire de déplacement pour un actionneur hydrodynamique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403639A1 (de) * 1994-02-05 1995-08-10 Festo Kg Fluidisch betätigbare Vorschubeinheit
DE9412435U1 (de) * 1994-08-02 1994-09-29 Festo Kg, 73734 Esslingen Arbeitszylinder
DE29713546U1 (de) * 1997-07-30 1997-09-25 Festo AG & Co, 73734 Esslingen Optische Weg- und/oder Positionssensoranordnung
DE29713825U1 (de) * 1997-08-02 1997-10-02 Festo Kg, 73734 Esslingen Fluidbetätigter Arbeitszylinder
CN105402197B (zh) * 2016-01-06 2018-01-09 安徽珂力智能电气有限公司 一种四方柱形活塞杆的气缸
US11828306B2 (en) 2021-04-30 2023-11-28 Industries Mailhot Inc. Method and a system for position measurement of a piston rod of a hydraulic cylinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096497A (en) * 1961-03-06 1963-07-02 Ling Temco Vought Inc Combination hydraulic actuator and potentiometer
FR2233512A1 (en) * 1973-06-14 1975-01-10 Repiquet Sa Vice with controlled displacement - has plastic marks on stem for photodetector
FR2343909A1 (fr) * 1976-03-12 1977-10-07 Outillage Air Comprime Dispositif d'asservissement de la position de l'organe mobile d'un appareil a pression de fluide
GB2062124A (en) * 1979-10-22 1981-05-20 Secretary Industry Brit Fluid driven oscillator and hammer device
DE8627037U1 (de) * 1986-10-11 1987-01-08 Hügler, Klaus, 73614 Schorndorf Arbeitszylinder, insbesondere Pneumatikzylinder für Komponenten von Handlingautomaten
DE3535704A1 (de) * 1985-10-05 1987-04-09 Festo Kg Kolben-zylinder-anordnung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096497A (en) * 1961-03-06 1963-07-02 Ling Temco Vought Inc Combination hydraulic actuator and potentiometer
FR2233512A1 (en) * 1973-06-14 1975-01-10 Repiquet Sa Vice with controlled displacement - has plastic marks on stem for photodetector
FR2343909A1 (fr) * 1976-03-12 1977-10-07 Outillage Air Comprime Dispositif d'asservissement de la position de l'organe mobile d'un appareil a pression de fluide
GB2062124A (en) * 1979-10-22 1981-05-20 Secretary Industry Brit Fluid driven oscillator and hammer device
DE3535704A1 (de) * 1985-10-05 1987-04-09 Festo Kg Kolben-zylinder-anordnung
DE8627037U1 (de) * 1986-10-11 1987-01-08 Hügler, Klaus, 73614 Schorndorf Arbeitszylinder, insbesondere Pneumatikzylinder für Komponenten von Handlingautomaten

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941813A1 (fr) * 1998-03-10 1999-09-15 Novartec AG Outil de presse et procédé pour sertir les raccords de tubes
EP0941812A1 (fr) * 1998-03-10 1999-09-15 Novartec, Ltd. Dispositif de vérin avec une pompe à fluide et un outil de presse
CN100342143C (zh) * 2004-07-22 2007-10-10 杨世祥 一种双级螺旋内反馈数字流体缸
EP2042412A2 (fr) 2007-09-26 2009-04-01 BPW Bergische Achsen KG Elément d'actionnement pour système de relevage d'axe et ensemble de rééquipement pour éléments d'actionnement du système de relevage d'axe
EP2042412A3 (fr) * 2007-09-26 2009-09-30 BPW Bergische Achsen KG Elément d'actionnement pour système de relevage d'axe et ensemble de rééquipement pour éléments d'actionnement du système de relevage d'axe
WO2009053812A3 (fr) * 2007-10-22 2009-07-02 A M A S P A Système pour déterminer la position d'un piston le long de sa trajectoire de déplacement pour un actionneur hydrodynamique
US8776667B2 (en) 2007-10-22 2014-07-15 A.M.A. S.P.A. System for determining the position of a piston along its path of travel for a fluid-dynamic actuator

Also Published As

Publication number Publication date
DE59304878D1 (de) 1997-02-06
EP0591614B1 (fr) 1996-12-27
DE9209980U1 (de) 1992-09-24

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