EP0591614B1 - Vérin - Google Patents

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Publication number
EP0591614B1
EP0591614B1 EP93107873A EP93107873A EP0591614B1 EP 0591614 B1 EP0591614 B1 EP 0591614B1 EP 93107873 A EP93107873 A EP 93107873A EP 93107873 A EP93107873 A EP 93107873A EP 0591614 B1 EP0591614 B1 EP 0591614B1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
cylinder
assembly according
cylinder assembly
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.)
Expired - Lifetime
Application number
EP93107873A
Other languages
German (de)
English (en)
Other versions
EP0591614A1 (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, which is a fixedly arranged on the piston rod have in the longitudinal direction extending measuring section and at least one cylinder-fixed interrogation means cooperating with the measuring section.
  • a piston-cylinder unit of this type is known, for example, from GB-A-2 062 124.
  • the measuring section provided on the piston rod consists of a large number of successive markings which run past a series of interrogation means.
  • a respective marking When passing through a respective query means, a respective marking generates a pulse.
  • the polling process can be carried out without contact by using suitable sensor units as polling means.
  • a query by direct contact with the query means is also mentioned, the query means being formed by microswitches which are actuated when they come into contact with the markings, for example formed as elevations.
  • 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 the measuring section is arranged, and in that the measuring section is an electrical resistance strip which is laid along the supporting surface and which is used by an interrogator serving cylindrical fixed sliding contact is tapped.
  • An at least partially flattened piston rod is therefore used as a carrier for the measuring section.
  • the measuring section can be attached and queried precisely.
  • an anti-rotation lock is achieved so that the Measuring section always takes 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.
  • the measuring section By designing the measuring section as a resistance strip, which is tapped by a strip contact arranged fixed to the cylinder, very precise conclusions about the current piston rod position can be drawn on the basis of the electrical resistance change occurring when the resistance strip is displaced.
  • 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, several measuring sections can be attached 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.
  • the piston-cylinder unit includes 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 which extends in the longitudinal direction of the cylinder and penetrates a cylinder cover 4, which closes one end of the cylinder 1.
  • 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.
  • the piston-cylinder unit shown in the figures is therefore equipped with means 13 for determining the position of the piston rod.
  • a measuring section 14 which can be detected 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 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 takes place, for example, by interposing a stored insulation layer 30. Only with one of its two axial end regions, in this 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 intensity. 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 protrudes 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)

Claims (9)

  1. Groupe à piston et cylindre, comportant une tige de piston (3) sortant sur au moins une face en haut hors du cylindre (1) et comportant des moyens pour déterminer la position de la tige de piston (3) et/ou du piston (2) relié à celle-ci et placé dans le cylindre, qui présentent une piste de mesure (14) solidaire de la tige de piston (3) et s'étendant dans la direction longitudinale de celle-ci et au moins un moyen de relevé (32) solidaire du cylindre et coopérant avec la piste de mesure (14), caractérisé en ce que la tige de piston (3) présente du côté de sa périphérie au moins une surface porteuse (15) s'étendant sur une grande partie de sa longueur et possédant une forme plate, sur laquelle est placée la piste de mesure (14), et en ce que la piste de mesure (14) est une bande résistive électrique (25) posée le long de la surface porteuse (15), bande qui est balayée par un contact glissant (32) solidaire du cylindre et servant de moyen de relevé.
  2. Groupe à piston et cylindre selon la revendication 1, caractérisé en ce que la tige de piston (3) est une tige quadrangulaire à section en particulier carrée, la surface porteuse (15) étant formée par l'une des quatre faces de la tige.
  3. Groupe à piston et cylindre selon la revendication 1 ou 2, caractérisé en ce que la bande résistive (25) est disposée en renfoncement dans la surface porteuse (15).
  4. Groupe à piston et cylindre selon la revendication 3, caractérisé en ce que la bande résistive (25) est posée dans une rainure longitudinale (26) prévue sur la surface porteuse (15).
  5. Groupe à piston et cylindre selon la revendication 3 ou 4, caractérisé en ce que la surface de la bande résistive (25) qui est tournée vers l'extérieur se raccorde jointivement aux parties de surfaces adjacentes de la surface porteuse (15).
  6. Groupe à piston et cylindre selon l'une des revendications 1 à 5, caractérisé en ce que la bande résistive (25) est collée sur la tige de piston (3).
  7. Groupe à piston et cylindre selon l'une des revendications 1 à 6, caractérisé en ce qu'une couche d'isolation (30) est insérée entre la bande résistive (25) et la tige de piston (3) constituée d'un matériau électriquement conducteur.
  8. Groupe à piston et cylindre selon l'une des revendications 1 à 7, caractérisé en ce que la bande résistive (25) se trouve dans l'une de ses zones d'extrémité en contact électriquement conducteur avec la tige de piston (3) et est ailleurs isolée vis-à-vis de celle-ci, un deuxième contact glissant (35, 35') balayant la tige de piston (3) et les deux contacts glissants (32 ; 35, 35') étant raccordés à une unité d'analyse (34).
  9. Groupe à piston et cylindre selon la revendication 8, caractérisé en ce que le deuxième contact glissant (35') est porté par une barre de contact (41) solidaire du cylindre et engagée dans un évidement (40) de la tige de piston (3).
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 EP0591614A1 (fr) 1994-04-13
EP0591614B1 true 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

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713825U1 (de) * 1997-08-02 1997-10-02 Festo Kg, 73734 Esslingen Fluidbetätigter Arbeitszylinder
CN107740794A (zh) * 2016-01-06 2018-02-27 合肥龙精灵信息技术有限公司 一种四方柱形活塞杆的气缸

Families Citing this family (9)

* 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
EP0941813B1 (fr) * 1998-03-10 2003-10-29 Ridge Tool 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
DE102007045849A1 (de) * 2007-09-26 2009-04-02 Bpw Bergische Achsen Kg Betätigungselement für Achslifte und Nachrüstsatz für Achsliftbetätigungselemente
ES2482095T3 (es) 2007-10-22 2014-08-01 A.M.A. S.P.A. Sistema para determinar la posición de un pistón a lo largo de su trayectoria de desplazamiento para un accionador fluido-dinámico
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

Family Cites Families (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
GB2062124B (en) * 1979-10-22 1983-10-05 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713825U1 (de) * 1997-08-02 1997-10-02 Festo Kg, 73734 Esslingen Fluidbetätigter Arbeitszylinder
CN107740794A (zh) * 2016-01-06 2018-02-27 合肥龙精灵信息技术有限公司 一种四方柱形活塞杆的气缸

Also Published As

Publication number Publication date
DE59304878D1 (de) 1997-02-06
EP0591614A1 (fr) 1994-04-13
DE9209980U1 (de) 1992-09-24

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