+

WO1994007037A1 - Dispositif de positionnement pour des cylindres a fluide - Google Patents

Dispositif de positionnement pour des cylindres a fluide Download PDF

Info

Publication number
WO1994007037A1
WO1994007037A1 PCT/SE1993/000700 SE9300700W WO9407037A1 WO 1994007037 A1 WO1994007037 A1 WO 1994007037A1 SE 9300700 W SE9300700 W SE 9300700W WO 9407037 A1 WO9407037 A1 WO 9407037A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston rod
magnets
magnetic
piston
rod
Prior art date
Application number
PCT/SE1993/000700
Other languages
English (en)
Inventor
Anders Liljenberg
Lars-Göran SANDER
Original Assignee
Ab Rexroth Mecman
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 Ab Rexroth Mecman filed Critical Ab Rexroth Mecman
Priority to EP93921138A priority Critical patent/EP0662199A1/fr
Publication of WO1994007037A1 publication Critical patent/WO1994007037A1/fr

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
    • 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
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • 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

Definitions

  • the present invention concerns a device for positioning according to the preamble of claim 1.
  • a piston rod is obtained having a envelope surface that has to be finished in order to obtain a sufficient smotheness for preventing leackage from the cylinder from occurring at the sealing bet ⁇ ween the cylinder end wall and the piston rod.
  • a sufficient smotheness for preventing leackage from the cylinder from occurring at the sealing bet ⁇ ween the cylinder end wall and the piston rod.
  • a very advantageous embodiment of the invention is obtained by the feature in claim 2, whereby it is possible to apply the device in extremely difficult surroundings as e.g. in aluminium smelting plants or in soda boilers, where the piston cylinder aggregate is subject to considerable heat and/or high humidity.
  • the device is applied on the opposite side with respect to the operational piston rod, simple adjustability and possibility of maintainance or replacement is also achieved.
  • This embodiment is also parti- cularly useful when the piston cylinder aggregate is to be provided with a through piston rod, particularly for compensa ⁇ tion of masses, such as tools, being applied to the working piston rod, and for adaption of the working areas of the piston.
  • the magnets may be applied on a central rod, which substantially facilitates mounting of the magnets into one unit, which may be applied within the covering.
  • the piston rod containing the magnets also comprises the operational piston rod, said central rod may be force transmitting.
  • the thickness of the plates being adjustable for optimizing the magnetic field when using magnetizable plates and/or for adjustment of the axial positions of the magnets, a large extent of freedom of using magnets of standard sizes is also achieved, at the same time as very simple adjustment of the entire magnet unit to the present situation is possible.
  • the invention is also applicable in piston cylinder aggregates of a conventional type. It may e.g be used in rodless cylinders.
  • Fig. 1 shows, partly in a central axial section, a part of a positioning device according to the present invention
  • Fig. 2 shows a diagrammatic coupling diagram for the device according to Fig. 1, and
  • Fig. 3 shows diagrammatically the magnets with indicated flux lines and, underneath in the form of a diagram, the signal from the sensor to the control device.
  • Fig 1 thus shows a piston cylinder aggregate 1 in a central axial section.
  • the cylinder which comprises a cylinder end plate 2 and a cylinder tube 3, an operational piston is axial- ly moveably arranged (not shown) .
  • a piston rod 5 extends from the piston and passes through the cylinder end wall 2 via conventional sealing elements.
  • Piston rod 5 comprises a covering 6 of a non magnetic material as stainless austenitic steel, an aluminium alloy, a reinforced plastic or any other suitable material.
  • Plate shaped magnets 8 are contained within the covering 6, said magnets being arranged with their magnetic axis essentially coaxial to the axis of the piston rod 5.
  • Every second magnet 8 is turned in such a way that the poles of two adjacent magnets of the same kind are place oppo ⁇ site to each other.
  • the axial pole sequence of two adjacent magnets will thus be: south-north-north-south or north-south- south-north.
  • the magnets 8, being of a standard type, are comprising an external diameter which is somewhat smaller than the inner diameter of the covering. Between adjacent magnets 8 a distance plate 9 of a magnetizable material is inserted.
  • the distance plates 9 correspond to the inner diameter of the covering so that a suitable fit is obtained between the plates and the covering.
  • the thickness of the distance plates 9 may also be choosen in such a way that the magnetic flux is opimized, which may easily be tested by one skilled in the art. In com ⁇ bination with, or as an alternative thereto, the thickness of the distance plates 9 may be adapted for achieving desired sensing positions for a sensor 10 which is placed adjacent the piston rod 5, said sensor via a cable 11 communicating with a central control unit. Optimizing the magnetic flux may be very essential, e.g. when the sensor for some reason may not be applied in proximity to the piston rod, or when it is desired to use a thick covering. To facilitate mounting of the magnet/plate unit, a central rod 7 is situated within the piston rod 5.
  • the covering 6 and/or the central rod 7 may comprise force transmitting elements.
  • the piston rod 5 is only comprising a posi ⁇ tioning piston rod, which opposes the actual operational piston rod.
  • the piston rod 5 may also serve to adjust the working area of the piston within the cylinder.
  • Fig. 2 shows diagrammatically a coupling diagram for the positioning device according to Fig. 1, with the sensor 10 being placed adjacent the piston rod 5.
  • a programmable logic computer (PLC) 13 is used as the control unit, said computer via the cable 11 receiving inpulses from the sensor 10. Possibly a relativly simple counter may also be used as an alternative to such a computer.
  • the control unit 13 After having received a determined number of pulses from the sensor 10, the control unit 13 transmits signals to the valve 1 , to set this element: for axial movement to the right or to the left, in the Figure, or for cylinder stop. 15 indicates a pressure fluid source.
  • FIG. 3 On top of Fig. 3, four magnets, being positioned adjacent to each other in a magnetic unit are diagrammatically shown with the poles indicated as well as flux lines 16a and 16b, and flux directions by means of arrows 17a and 17b.
  • the lines 18 and 19 indicate the levels of operation on and off respective ⁇ ly of the sensor (here the applicant's own magnetic piston sensor 322-20, -21). The different levels are explained by a certain sensor hystereses.
  • Fig. 3 shows the signal in volts from the sensor as a function of the lenght of the movement when the sensor is moved in parallel to the rod.
  • the signal from the sensor is thus a square wave.
  • the embodiment of the invention according to the description is only to be consider as an example and the invention is only limited to what is stated in the following patent claims.
  • the sensor may thus, as was indicated earlier, be of any suitable kind if earlier mentioned conditions with respect to among others unsensitivity to noise are fulfilled.
  • the magnetic piston sensor described which is of a magneto resistive type, may of course also be replaced by other sensors of this kind. Sensors of the Hall-element type may also come in question as well as e.g. reed sensors.
  • the sensor of the latter kind hand ⁇ les processes at least up to 50 Hz, while the other sensors mentioned handle still faster switching processes.
  • the described positioning device is adapted to what may be defined as rough positioning, where the position normally is allowed to vary within ⁇ 1 mm. More accurate positioning may be achieved if more than one sensor are applied axially displaced adjacent the piston rod (c.f. indication in e.g. sliding calipers) .
  • a typical distance between the poles of the magnets is 4 - 15 mm, also other distances may, however, come into question. Tne shortest distances are now fully realistic in view of the stable permanent magnets now being available on the market.
  • the invention also provides good possibilites of adjusting the indicator positions axially in different ways. This may be accomplished by the sensor being axially displaceably mounted adjacent the piston rod on a guide, on threaded pins, or in any other way.
  • the magnet unit may also be displaceable within the covering by means of threaded distance fittings, axially expanding plates or in any other suibable manner.
  • the piston rod may contain groups of magnets along only determined portions of the axial extention of the piston rod, whereas rod or tube shaped distance elements (12 in Fig. 1) may be mounted between the groups of magnets, defining e.g. reversing positions or stop positions.
  • distance plates 9 of a non magnetizable material as plastic, stainless austenitic steel, an aluminium alloy or any other suitable material. What is stated above with respect to the plates dimensions is also applicable with respect to non magnetizable plates (except the optimation of the magnetic field) .
  • the indication rod contains magnets 8, distance plates 9 and possibly a rod 7 and distance means in accordance with what has been described above in connection with the piston rod 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Dans un dispositif de positionnement pour un ensemble piston-cylindre (1) avec une tige de piston (5) connectée au piston, la tige de piston porte à des positions axiales déterminées des corps magnétiques et un détecteur (10) pour détecter le champ magnétique des corps magnétiques jouxte la tige de piston (5). Les corps magnétiques sont constitués d'aimants permanents en forme de plaque (8) avec une surface d'enveloppe sensiblement circulaire. Chaque aimant (8) est disposé avec son axe magnétique sensiblement coaxial par rapport à l'axe du piston (5) et avec ses pôles magnétiques disposés dans la direction opposée par rapport aux pôles des aimants adjacents. Finalement, la tige du piston comprend un revêtement externe en forme de conduite qui est sensiblement lisse (6) et qui est réalisé en un matériau non magnétique qui entoure les aimants (8) mais permet le passage du flux magnétique.
PCT/SE1993/000700 1992-09-23 1993-08-23 Dispositif de positionnement pour des cylindres a fluide WO1994007037A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93921138A EP0662199A1 (fr) 1992-09-23 1993-08-23 Dispositif de positionnement pour des cylindres a fluide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9202750-7 1992-09-23
SE9202750A SE501291C2 (sv) 1992-09-23 1992-09-23 Anordning för positionering av kolvcylinderaggregat

Publications (1)

Publication Number Publication Date
WO1994007037A1 true WO1994007037A1 (fr) 1994-03-31

Family

ID=20387251

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1993/000700 WO1994007037A1 (fr) 1992-09-23 1993-08-23 Dispositif de positionnement pour des cylindres a fluide

Country Status (3)

Country Link
EP (1) EP0662199A1 (fr)
SE (1) SE501291C2 (fr)
WO (1) WO1994007037A1 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695879A1 (fr) * 1994-08-02 1996-02-07 Festo KG Cylindre de travail
WO1998023922A1 (fr) * 1996-11-22 1998-06-04 Daimler-Benz Aktiengesellschaft Element de detection
DE10010042A1 (de) * 2000-01-13 2001-07-19 Continental Teves Ag & Co Ohg Linearer Wegsensor und dessen Verwendung als Betätigungsvorrichtung für Kraftfahrzeuge
WO2001014750A3 (fr) * 1999-08-20 2001-09-13 Samson Ag Organe d'entrainement d'une soupape de regulation comportant une unite pour detecter la position de la soupape
US6331772B1 (en) 1996-11-22 2001-12-18 Daimlerchrysler Ag Sensor component
DE10045874A1 (de) * 2000-09-14 2002-03-28 Continental Teves Ag & Co Ohg Kraftfahrzeugsensorvorrichtung
EP1069321A3 (fr) * 1999-07-12 2002-05-22 Smc Corporation Distributeur pneumatique avec détection de la position
EP1217221A2 (fr) 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
US6478310B1 (en) * 1999-10-04 2002-11-12 Smc Corporation Combination pneumatic chuck with position detecting mechanism
DE20218754U1 (de) 2002-12-04 2003-02-20 Harting Automotive GmbH & Co. KG, 32339 Espelkamp Messvorrichtung zur Wegbestimmung
US6823725B2 (en) 2000-01-13 2004-11-30 Continental Teves Ag & Co., Ohg Linear distance sensor and the use thereof as actuator for motor vehicles
FR2867237A1 (fr) * 2004-03-03 2005-09-09 Johnson Contr Automotive Elect Dispositif telescopique avec detection electromagnetique de position
WO2006019907A1 (fr) * 2004-07-14 2006-02-23 Tenneco Automotive Operating Company, Inc. Absorbeur de chocs avec capteur de déplacement intégré
US7859253B2 (en) 2007-06-29 2010-12-28 Melexis Tessenderlo Nv Magnetic structure for detecting a relative motion between the magnetic structure and a magnetic field sensor
EP1862768A3 (fr) * 2006-04-27 2011-03-02 Hirschmann Automotive GmbH Dispositif de capteur sur base Hall destiné à la mesure de mouvements linéaires
US8857530B2 (en) 2011-03-07 2014-10-14 Cnh Industrial Canada, Ltd. Automatic depth control system for an agricultural implement
WO2022073537A1 (fr) * 2020-10-08 2022-04-14 Schaeffler Technologies AG & Co. KG Élément et dispositif de commutation à élément de commutation
WO2023088972A1 (fr) * 2021-11-19 2023-05-25 Université D'evry Val D'essonne Verin a capteur de position integre

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876945A (en) * 1987-10-13 1989-10-31 Festo Kg Piston and cylinder unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876945A (en) * 1987-10-13 1989-10-31 Festo Kg Piston and cylinder unit

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568760A (en) * 1994-08-02 1996-10-29 Festo Kg Fluid power cylinder with position indicator
EP0695879A1 (fr) * 1994-08-02 1996-02-07 Festo KG Cylindre de travail
WO1998023922A1 (fr) * 1996-11-22 1998-06-04 Daimler-Benz Aktiengesellschaft Element de detection
US6331772B1 (en) 1996-11-22 2001-12-18 Daimlerchrysler Ag Sensor component
EP1069321A3 (fr) * 1999-07-12 2002-05-22 Smc Corporation Distributeur pneumatique avec détection de la position
US6752171B1 (en) 1999-08-20 2004-06-22 Samson Aktiengesellschaft Control-valve drive with sensor unit for detecting the position of the valve
WO2001014750A3 (fr) * 1999-08-20 2001-09-13 Samson Ag Organe d'entrainement d'une soupape de regulation comportant une unite pour detecter la position de la soupape
US6478310B1 (en) * 1999-10-04 2002-11-12 Smc Corporation Combination pneumatic chuck with position detecting mechanism
DE10010042A1 (de) * 2000-01-13 2001-07-19 Continental Teves Ag & Co Ohg Linearer Wegsensor und dessen Verwendung als Betätigungsvorrichtung für Kraftfahrzeuge
US6823725B2 (en) 2000-01-13 2004-11-30 Continental Teves Ag & Co., Ohg Linear distance sensor and the use thereof as actuator for motor vehicles
DE10045874A1 (de) * 2000-09-14 2002-03-28 Continental Teves Ag & Co Ohg Kraftfahrzeugsensorvorrichtung
EP1217221A2 (fr) 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
DE20218754U1 (de) 2002-12-04 2003-02-20 Harting Automotive GmbH & Co. KG, 32339 Espelkamp Messvorrichtung zur Wegbestimmung
FR2867237A1 (fr) * 2004-03-03 2005-09-09 Johnson Contr Automotive Elect Dispositif telescopique avec detection electromagnetique de position
WO2005088154A1 (fr) * 2004-03-03 2005-09-22 Valeo Systemes De Contrôle Moteur Dispositif telescopique avec detection electromagnetique de position
CN1985104B (zh) * 2004-07-14 2010-05-05 田纳科自动化操作有限公司 具有集成位移传感器的减震器以及位移传感器
GB2429757A (en) * 2004-07-14 2007-03-07 Tenneco Automotive Operating Shock absorber with integrated displacement sensor
US7493995B2 (en) 2004-07-14 2009-02-24 Tenneco Automotive Operating Company, Inc. Shock absorber with integrated displacement sensor
GB2429757B (en) * 2004-07-14 2009-07-29 Tenneco Automotive Operating Shock absorber with integrated displacement sensor
WO2006019907A1 (fr) * 2004-07-14 2006-02-23 Tenneco Automotive Operating Company, Inc. Absorbeur de chocs avec capteur de déplacement intégré
EP1862768A3 (fr) * 2006-04-27 2011-03-02 Hirschmann Automotive GmbH Dispositif de capteur sur base Hall destiné à la mesure de mouvements linéaires
US7859253B2 (en) 2007-06-29 2010-12-28 Melexis Tessenderlo Nv Magnetic structure for detecting a relative motion between the magnetic structure and a magnetic field sensor
EP2009404A3 (fr) * 2007-06-29 2014-12-24 Melexis Technologies NV Structure magnétique pour détecter le mouvement relative entre la structure magnétique et un capteur de champ magnetique
US8857530B2 (en) 2011-03-07 2014-10-14 Cnh Industrial Canada, Ltd. Automatic depth control system for an agricultural implement
WO2022073537A1 (fr) * 2020-10-08 2022-04-14 Schaeffler Technologies AG & Co. KG Élément et dispositif de commutation à élément de commutation
WO2023088972A1 (fr) * 2021-11-19 2023-05-25 Université D'evry Val D'essonne Verin a capteur de position integre
FR3129473A1 (fr) * 2021-11-19 2023-05-26 Université D’Evry Val d’Essonne Vérin à capteur de position intégré

Also Published As

Publication number Publication date
SE9202750D0 (sv) 1992-09-23
SE501291C2 (sv) 1995-01-09
SE9202750L (sv) 1994-03-24
EP0662199A1 (fr) 1995-07-12

Similar Documents

Publication Publication Date Title
EP0662199A1 (fr) Dispositif de positionnement pour des cylindres a fluide
EP0707195B1 (fr) Détecteur magnétique du déplacement d'un objet
US5514961A (en) Position detecting device for a linear drive including two magnets having like poles disposed facing each other for concentrating the flux at one point
US5826616A (en) Valve spool position detector apparatus
EP0595553B1 (fr) Capteurs de position perfectionés
US4901628A (en) Hydraulic actuator having a microwave antenna
US5926018A (en) Proximity switch
CA2092656C (fr) Transducteur de mouvement
EP0099712A2 (fr) Débitmètre
EP0171931B1 (fr) Instruments avec des aimants mobiles
US5257921A (en) Electronic slide valve position indicator
US20050248337A1 (en) Measuring device comprising a hall sensor and method for the pruduction thereof
AU588659B2 (en) Flowmeter
US4694161A (en) Fluid flow and level detector
CA1322464C (fr) Indicateur de debit de fluide cible
CA1196803A (fr) Dispositif de debitmetrie
GB2317234A (en) Suspended body flowmeter
US4899643A (en) Hydraulic cylinder comprising at least one electric position indicator
US4743170A (en) Slide valve position indicator and magnetic coupler
JPH06173910A (ja) 圧力媒体シリンダ
EP1460393B1 (fr) Débitmètre avec capteur magnétique
US4574485A (en) Bore-insertable apparatus for stationary measurement of bore-width changes in geological formations
JPH08285130A (ja) 開度の検知可能な手動開閉弁
WO1991019168A1 (fr) Procede et systeme de detection magnetique
GB2142710A (en) Valve

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1993921138

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1993921138

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1993921138

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载