EP0695879A1 - Cylindre de travail - Google Patents

Cylindre de travail Download PDF

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Publication number
EP0695879A1
EP0695879A1 EP95102202A EP95102202A EP0695879A1 EP 0695879 A1 EP0695879 A1 EP 0695879A1 EP 95102202 A EP95102202 A EP 95102202A EP 95102202 A EP95102202 A EP 95102202A EP 0695879 A1 EP0695879 A1 EP 0695879A1
Authority
EP
European Patent Office
Prior art keywords
strip
working cylinder
piston rod
cylinder according
magnetic
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
EP95102202A
Other languages
German (de)
English (en)
Other versions
EP0695879B1 (fr
Inventor
Johannes Volzer
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 EP0695879A1 publication Critical patent/EP0695879A1/fr
Application granted granted Critical
Publication of EP0695879B1 publication Critical patent/EP0695879B1/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
    • F15B15/2815—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
    • 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 invention relates to a working cylinder, with a housing in which there is an axially movable piston, which is connected to a piston rod protruding from the housing on at least one end face, which has at least one axially extending and flat shape on the outer circumference, in which a longitudinal groove is provided which receives a measuring strip which can be scanned by a sensor device fixed to the housing.
  • a working cylinder of this type emerges from the German utility model G 92 09 980.7. It is equipped with a position measuring system which enables the position of the piston or the piston rod to be determined. It includes, for example, a measuring section designed as a resistance strip, which is accommodated in a longitudinal groove of the piston rod and by one as a sensor device acting sliding contact is applied and tapped.
  • the measuring strip is a magnetic strip which has a plurality of magnetically magnetized magnet zones which are arranged one after the other in the axial direction and which can be scanned contactlessly by the sensor device, and that the magnetic strip is secured by a cover strip fixed to the piston rod and made of a material permeable to a magnetic field is covered, the outer surface of which faces away from the magnetic strip forms at least part of the flat section of the surface section of the piston rod.
  • the interaction of the sensor device with the magnetic strip with alternating poles enables extremely reliable and exact position determination even at relatively high piston speeds.
  • the sensor device expediently comprises Several semiconductor sensors, for example so-called Hall sensors, which are attached to the housing of the working cylinder in such a way that they are penetrated by the differently polarized magnetic fields of the magnetic strip when the piston rod is moving and supply usable signals from an evaluation electronics.
  • the contactless “scanning” prevents any wear on the parts contributing to the position determination.
  • the cover strip additionally arranged above the magnetic strip has the further effect that the magnetic strip is protected from damage even when a housing-side end wall and a guide and / or sealing arrangement provided there are penetrated, and at the same time an optimal sealing of the passage area between the end wall and the piston rod is realized can, whose quality is in no way inferior to that of sealing conventional piston rods.
  • the cover strip forms at least one component of the flat section of the piston rod which has the longitudinal groove and is therefore a component of the outer surface of the piston rod, which can cooperate with the guide and / or sealing arrangement mentioned in a manner known per se.
  • the flat section has a flat section which allows the piston rod to be secured in a cost-effective manner so that the magnetic strip is always in the correct position with respect to the sensor device arranged on the housing. Since the cover strip can be designed to withstand high mechanical loads, even high torques acting on the piston rod can be compensated for without impairing the accuracy of the position determination.
  • a relatively simple design of the working cylinder provides that the cover strip is at least partially and preferably completely embedded in the longitudinal groove of the flat or straight surface section. By the realized here positive connection between the cover strip and the piston rod, the cover strip is securely fixed.
  • Spring steel has proven to be a particularly suitable material for the cover strip, for example the steel of the specification 13 X RM 19 supplied by Sandvik.
  • a particularly advantageous fastening measure for the magnetic strip and the cover strip has been found to be an adhesive connection in which the parts are connected to the piston rod by means of a high-strength adhesive.
  • a further advantageous embodiment provides for the sensor device to be equipped with a sensor head containing the corresponding sensors, which can be integrated into the end wall of the housing which is generally formed by a cover.
  • Signal evaluation electronics can be integrated directly into the sensor head, signal amplification and processing can take place directly in the sensor head, which has the advantage of very good signal stability.
  • the working cylinder comprises a housing 1 in which a piston 2 is arranged to be axially movable.
  • the piston 2 tightly separates two working spaces 3, 4, into each of which a housing channel 5 opens, which in a manner known per se serves to supply and remove a fluid driving the piston, such as compressed air.
  • the two end faces of the housing 1 are closed by end walls 6, 7, which are designed as removable covers.
  • a piston rod 8 is attached, which extends axially and which passes through an end wall 6 coaxially to the outside.
  • the end wall 6 is a bearing wall which supports and guides the piston rod 8 in the transverse direction.
  • a guide device 13 which is fixed to the housing and is a sliding guide for the piston rod 8, is arranged in the passage opening 12 of the end wall 6 through which the piston rod 2 passes. It is also located in the passage opening 12 a sealing device 14, for example formed in a structural unit with the guide device 13, which is fixed on the one hand to the end wall 6 and on the other hand is in dynamic sealing contact with the piston rod 8 all around. It prevents fluidic pressure medium from the neighboring working space 3 from escaping through the passage opening 12.
  • the guiding and / or sealing device 13, 14 could at least partially also be arranged outside the passage opening 12.
  • a fastening part 15 is provided at the end of the piston rod 8 lying outside the housing 1. It enables the attachment of any component to be moved by the working cylinder.
  • the working cylinder is equipped with a position determining device, generally designated by reference number 16. It is a position measuring system that allows the distance traveled by the piston rod 8 or its current position to be determined. This enables path-dependent control and actuation of the working cylinder.
  • the piston rod 8 has at least one axially extending and flat shape surface section 17 on its outer circumference.
  • This flat, straight surface section 17 extends over at least a large part of the length of the piston rod 8 and is at least arranged and designed such that it is independent of the respective axial position of the piston 2 or the piston rod 8 is always radially opposite with a portion of its length to a sensor device 18 fixed on the housing 1.
  • Said sensor device 18 is attached in the exemplary embodiment to the end wall 6 functioning as a bearing cover.
  • the sensor device 18 works together with a magnetic strip 22 which is accommodated in an axially extending longitudinal groove 23 which is introduced into the flat section 17 having a flat shape.
  • the sensor device 18 practically runs along the magnetic strip 22 and is actuated by the latter, so that sensor signals result which are processed in a connected processing device 24 in the desired manner.
  • the sensor signals can be processed to control valves, which in turn control the actuation of the working cylinder as a function of the current stroke position.
  • the tape-shaped magnetic strip 22 is a plastic-bound part, it is a plastic strip with magnetizable components or particles, in principle comparable to the magnetic tapes of tape or video devices that serve as sound carriers. However, it expediently has a thickness such that it has a certain intrinsic stability. In the exemplary embodiment, it is fastened in a sandwich-like manner on a carrier strip 25, which preferably consists of non-magnetic material and is a steel strip in the exemplary embodiment. The consisting of the magnetic strip 22 and the carrier strip 25 The strip unit is inserted with the carrier strip 25 ahead and at the bottom into the longitudinal groove 23, its flat underside 26 facing the flat groove base 27. The groove width corresponds to the strip width as well as the groove length corresponds to the strip length.
  • the strip unit is immovably centered in the longitudinal groove 23 in the strip plane.
  • the attachment in the longitudinal groove 23 is advantageously carried out in the context of a high-strength adhesive connection, which ensures that the magnetic strip 22 always remains unchanged with respect to the piston rod 8 even in the event of strong vibrations.
  • the magnetic strip 22 is divided into a plurality of magnetized magnetic zones 28, 28 ′ which follow one another in the longitudinal direction of the strip, the magnetization of the individual magnetic zones having an alternating pole.
  • the magnetic field alignment of two magnetic field zones 28, 28 'adjacent in the longitudinal direction of the strip thus deviates from one another in that the north and south poles are interchanged.
  • the individual magnetic field zones 28, 28 ' are axially polarized, ie their north poles (N) and south poles (S) are aligned in the longitudinal direction of the strip and thus in the axial direction of the piston rod 8.
  • the polarization is preferably such that successive magnetic field zones 28, 28 ′ face each other with polarization of the same name.
  • the sensor device 18 is fixed on the end wall 6 in such a way that it lies opposite the upper side 32 of the magnetic strip 22 opposite the groove base 27 at a distance perpendicular to the plane of the strip. During a stroke movement of the piston 2, the magnetic strip 22 is thus moved past the sensor device 18 in the longitudinal direction, the latter successively coming into the influence of the magnetic fields caused by the individual magnetic field zones 28, 28 '. These magnetic fields penetrate the sensor device 18, which in the exemplary embodiment contains two magnetic field-sensitive semiconductor sensors, not shown, for example so-called Hall sensors or field plate sensors.
  • the two semiconductor sensors of the sensor device 18 which are generally offset by 90 °, provide two sine signals offset by 90 °, which, depending on the fine interpolation division of a downstream evaluation electronics, finely interpolate to the desired resolution - for example 0.01 mm can be.
  • the signals obtained thus provide information about the current position of the piston rod 8 and each component connected to it.
  • the magnetic strip 22 is scanned by the sensor device 18 without contact, the components of the position determining device 16 are exposed to practically no mechanical wear and ensure a long service life of the working cylinder.
  • the thickness of the strip unit composed of the magnetic strip 22 and the carrier strip 25 is less than the depth of the longitudinal groove 23 receiving it.
  • the magnetic strip 22 therefore sits in the longitudinal groove 23 at a distance from the flat section 17.
  • the remaining depth section of the longitudinal groove 23 is taken up by a cover strip 33 which is fitted into the longitudinal groove 23 and rests on the magnetic strip 22.
  • the arrangement is preferably made such that the cover strip 33 is received completely recessed in the longitudinal groove 23, as can be seen from the exemplary embodiments.
  • the longitudinal groove is just filled by the cover strip 33, the magnetic strip 22 and the carrier strip 25, so that the outer surface 34 of the cover strip 33 opposite the magnetic strip 22 merges flush into the two surface portions 35 of the piston rod 8 adjoining the longitudinal groove 23 along the longitudinal side.
  • the outer surface 34 then, together with the two surface portions 35 flanking it, forms the flat portion 17 having the flat shape.
  • the cover strip ultimately gives the piston rod 8 the shape which it would have had in the case of a conventional, grooveless design.
  • the outer surface 34 and the adjacent surface portions 35 lie in a common plane that forms the surface section 17.
  • the cover strip 33 is firmly anchored in the longitudinal groove 23.
  • it is advantageously glued into the longitudinal groove 23.
  • Their layout corresponds to that of the longitudinal groove 23, so that the latter is completely closed by the cover strip 33.
  • the cover strip 33 ensures an optimal seal in the penetration area between the piston rod 8 and the end wall 6 while protecting the sensitive magnetic strip 22 from damage. Since the outer surface 34 of the sealing strip 33 forms at least a part of the flat section 17, it is in contact with the guide and / or sealing arrangement 13, 14 in the same way as the other outer surface regions of the piston rod 8 when passing through it is possible to form the transition area between the cover strip 33 and the adjacent surface portions 35 of the piston rod 8 in such a way that there is no space or depression, the pressure medium contained in the working space 3 has no overflow path in order to flow past the sealing device 14. According to the example, this is achieved by also introducing adhesive into the mentioned transition regions 36, so that the transition regions 36 are filled with adhesive up to the outer surface and a smooth transition is established between the adjoining outer surface regions.
  • the cover strip 33 So that the effectiveness of the position determining device 16 is not impaired by the cover strip 33, it is advisable to produce the cover strip from non-magnetizable material.
  • it consists of spring steel with low permeability, which is also extremely wear-resistant and corrosion-resistant.
  • Such a metal is sold, for example, by the Sandvik company under the designation 13 X RM 19.
  • the cover strip 33 for the magnetic fields of the magnetic strip 22 permeable which can thus act on the sensor device 18 in the desired manner.
  • the piston rod 8 has been ground in the exemplary embodiment after the cover strip 33 has been glued to the surface section 17. As a result, all unevenness levels out.
  • the sensor device 18 is formed by an extremely compact sensor head 37, which is excellently suited for integration into the housing 1 and, above all, as in the present case, into the end wall 6 penetrated by the piston rod 8.
  • the end wall 6 has a radially extending recess 38 in the region of the outlet opening 12, which is open on the one hand radially inwards to the piston rod 8 and on the other hand radially outwards to an outer surface 42 of the end wall 6.
  • the cartridge-like sensor head 37 for example, is inserted into this recess 38, so that it maintains the required distance from the cover strip 33 which it does not touch and which lies between it and the magnetic strip 22.
  • a dashboard evaluation electronics 43 is integrated, which evaluates the signals of the semiconductor sensors in the required manner.
  • the evaluation electronics are arranged externally and belong, for example, to the processing device 24.
  • a square rod as the piston rod 8, one of its four flat outer surfaces 45 forming the flat portion 17 having the flat shape.
  • the square section of the piston rod 8 preferably having a square cross section.
  • a further measuring strip in particular designed as a magnetic strip, could also be integrated in the area of at least one of the further flat outer surface sections 45 of the piston rod 8, which also cooperates with a sensor device. This would enable a coupled overall evaluation or an independent multiple evaluation.
  • piston rod cross-sections that have at least one flat surface section would also be conceivable. Examples include triangular bars or round bars with a flattened section.
  • the integration of a displacement measuring system with a material measure made of an alternating-pole magnetization lies Magnetic strips and an associated sensor head in a fluid-operated anti-rotation working cylinder.
  • the cross-section of the piston rod has at least one rectilinear partial flank, into which a longitudinal groove is embedded, which receives the magnetic strip fixed by means of a high-strength adhesive.
  • the non-magnetic cover strip which is permeable to magnetic fields, ensures a tribologically compatible covering of the magnetic strip due to its rustproof, low-permeability properties and is securely fixed by a high-strength adhesive.
  • a Sony PL 20 read head could be used as the sensor head of the present arrangement.
  • the lattice constant for dividing the magnetic strip into individual magnetic field zones is, for example, 5 mm. If necessary, more than two semiconductor sensors can be used for the scanning.
  • the magnetic strip and the cover strip are expediently glued into the longitudinal groove 23 one after the other and 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)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP95102202A 1994-08-02 1995-02-17 Cylindre de travail Expired - Lifetime EP0695879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9412435U 1994-08-02
DE9412435U DE9412435U1 (de) 1994-08-02 1994-08-02 Arbeitszylinder

Publications (2)

Publication Number Publication Date
EP0695879A1 true EP0695879A1 (fr) 1996-02-07
EP0695879B1 EP0695879B1 (fr) 2000-06-07

Family

ID=6911895

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102202A Expired - Lifetime EP0695879B1 (fr) 1994-08-02 1995-02-17 Cylindre de travail

Country Status (5)

Country Link
US (1) US5568760A (fr)
EP (1) EP0695879B1 (fr)
KR (1) KR100194164B1 (fr)
BR (1) BR9503521A (fr)
DE (2) DE9412435U1 (fr)

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EP1217221A2 (fr) 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
EP1571421A1 (fr) * 2004-03-05 2005-09-07 FESTO AG & Co Entraínement linéaire
EP1821072A3 (fr) * 2006-02-18 2008-07-16 Festo AG & Co. KG Dispositif destiné à la saisie de la position axiale et/ou la position d'inclinaison d'un corps
US8967035B2 (en) 2012-05-24 2015-03-03 Caterpillar Inc. Sensor coupler for piston-cylinder assembly

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DE19952590A1 (de) * 1999-11-02 2001-05-10 Daimler Chrysler Ag Verfahren zur Betätigung des Verdecks eines Kraftfahrzeugs
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KR100350993B1 (ko) * 2000-06-21 2002-08-30 주식회사 씨엠아이 휴민산분해용 수처리제 및 이 수처리제를 제조하는 방법
EP1392539B1 (fr) 2001-06-01 2009-12-02 Bayerische Motoren Werke Aktiengesellschaft Systeme destine a l'ouverture et a la fermeture d'une capote repliable ou d'un toit mobile dans un vehicule cabriolet
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KR100458921B1 (ko) * 2001-12-28 2004-12-03 조용래 스러리 대응을 위한 초고압을 이용한 유화 분산장치
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DE60335238D1 (de) * 2002-01-04 2011-01-20 Parker Hannifin Corp Zylinder mit optischer erfassungsvorrichtung und verfahren
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EP1620702B1 (fr) 2003-05-06 2013-07-10 SRI International Cylindre de pression avec une tige de piston et une couche magnetique sur la tige pour determiner la position de la tige
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KR200447977Y1 (ko) * 2009-02-18 2010-03-08 동양기전 주식회사 실린더 위치검출수단을 구비한 유압실린더
KR200447976Y1 (ko) * 2009-02-18 2010-03-08 동양기전 주식회사 실린더 위치검출수단을 구비한 유압실린더
WO2011100412A2 (fr) * 2010-02-11 2011-08-18 Sri International Système de mesure de déplacement et procédé utilisant des encodages magnétiques
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US8857530B2 (en) 2011-03-07 2014-10-14 Cnh Industrial Canada, Ltd. Automatic depth control system for an agricultural implement
KR101367531B1 (ko) * 2011-06-07 2014-02-25 이강창 지지구조를 갖는 유압실린더
KR101360084B1 (ko) 2012-05-29 2014-02-12 순천향대학교 산학협력단 액추에이터 이동측정장치, 그의 제조방법 및 그를 이용한 이동거리 측정방법
DE102013205216A1 (de) 2013-03-25 2014-09-25 Wittenstein Ag Linearaktuator mit Messvorrichtung zur Messung der Position eines Antriebselements
JP6245453B2 (ja) * 2015-01-19 2017-12-13 Smc株式会社 流体圧シリンダ
DE102016116780A1 (de) * 2016-09-07 2018-03-08 Elgo Electronic Gmbh & Co. Kg Kolben-Zylindervorrichtung und Verwendung einer solchen
WO2019033230A1 (fr) * 2017-08-14 2019-02-21 吉林省云动力智能装备制造有限公司 Cylindre à huile de réglage de force de serrage intelligent
CN108869447B (zh) * 2018-09-04 2019-11-29 哈尔滨工业大学 一种变有效作用面积液压缸
DE102021100559A1 (de) 2020-11-24 2022-05-25 Inventus Engineering Gmbh Vorrichtung mit wenigstens einer Sensoreinrichtung zur Erfassung von Messdaten über eine Relativbewegung und Maßstabeinrichtung
DE102020131245A1 (de) 2020-11-24 2022-05-25 Inventus Engineering Gmbh Vorrichtung mit wenigstens einer Sensoreinrichtung zur Erfassung von Messdaten über eine Relativbewegung und Maßstabeinrichtung
DE102021134121A1 (de) * 2021-12-21 2023-06-22 Samson Aktiengesellschaft Elektronische Positionsanzeige mittels Zahnstrukturmessanordnung

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217221A2 (fr) 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
EP1571421A1 (fr) * 2004-03-05 2005-09-07 FESTO AG & Co Entraínement linéaire
EP1821072A3 (fr) * 2006-02-18 2008-07-16 Festo AG & Co. KG Dispositif destiné à la saisie de la position axiale et/ou la position d'inclinaison d'un corps
US8967035B2 (en) 2012-05-24 2015-03-03 Caterpillar Inc. Sensor coupler for piston-cylinder assembly

Also Published As

Publication number Publication date
US5568760A (en) 1996-10-29
DE9412435U1 (de) 1994-09-29
EP0695879B1 (fr) 2000-06-07
DE59508445D1 (de) 2000-07-13
KR100194164B1 (ko) 1999-06-15
BR9503521A (pt) 1996-05-28
KR960008085A (ko) 1996-03-22

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