EP3293402A1 - Dispositif piston/cylindre et son utilisation - Google Patents

Dispositif piston/cylindre et son utilisation Download PDF

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Publication number
EP3293402A1
EP3293402A1 EP17180250.7A EP17180250A EP3293402A1 EP 3293402 A1 EP3293402 A1 EP 3293402A1 EP 17180250 A EP17180250 A EP 17180250A EP 3293402 A1 EP3293402 A1 EP 3293402A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston rod
piston
strip
cylinder means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17180250.7A
Other languages
German (de)
English (en)
Inventor
Heiko Essinger
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.)
Elgo Electronic GmbH and Co KG
Original Assignee
Elgo Electronic GmbH 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 Elgo Electronic GmbH and Co KG filed Critical Elgo Electronic GmbH and Co KG
Publication of EP3293402A1 publication Critical patent/EP3293402A1/fr
Withdrawn legal-status Critical Current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
    • F15B15/2846—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
    • F15B15/2861—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
    • 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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the present invention relates to a piston-cylinder device according to the preamble of the main claim. Furthermore, the present invention relates to a use of such a piston-cylinder device.
  • Generic piston-cylinder devices in particular realized as hydraulic cylinder devices, are generally known from the prior art and are used for a multiplicity of positioning and movement applications; In this case, energy from a fluid introduced into the cylinder means, for example hydraulic fluid, is converted into a force acting along an axial or longitudinal movement of the piston rod pushed out of the cylinder means.
  • the cylinder means are designed as a single or double cylinder, the concrete structural realization of a generic piston-cylinder device is dependent on a respective setting or movement purpose and the forces required for it.
  • Such detector means may be configured in the simplest case as a position or limit switch, which can then be actuated with the achievement of an associated position and evaluated according to the detection.
  • switches usually do not permit continuous detection of movement between piston and cylinder means, and in particular also intermediate positions along a path of movement of the cylinder means are normally not detectable.
  • piston rod mechanically or optically acting or acting on the piston rod means it is in particular also known as to provide the piston rod, which is then suitably made of a magnetizable metal material, with a magnetization, so then, in cooperation with a or several, usually externally of the cylinder means and for cooperation with the pushed out of the cylinder rod piston rod magnetic field detectors, this detector purpose is realized.
  • the piston rod in order to allow such magnetization, the piston rod must be made of a suitable and magnetizable material.
  • the typical piston rods, however, for mechanical reasons or for power transmission (the usually high forces of a hydraulic cylinder) used steels are often not or only poorly magnetizable, so that the choice of material for the piston rod is not without problems and often represents a magnetically and mechanically balanced compromise, but not each realized an optimum.
  • Object of the present invention is therefore to realize a generic piston-cylinder device, in particular as a hydraulic cylinder device, which detector means are assigned for detecting a relative movement and / or relative position between the cylinder means and the piston means, in view of a precision, reliability and robustness of the detection in particular to improve a variable length dimension of the piston rod pushed out of the cylinder means (depending on its operating state).
  • a piston-cylinder device is cost-effective and potentially manufacturable to manufacture designed with limited effort.
  • the invention provides, at least in sections, along the piston rod, and here along its pushed or pushed out of the cylinder means, a longitudinal groove, which runs axially parallel to the piston rod and in which a along the longitudinal extension magnetically coded strip is introduced.
  • This strip is then scanned according to the invention by the detector means provided for coaction with the coded strip on the cylinder means, typically at or adjacent an exit region of the piston rod from the cylinder means are.
  • the piston rod according to the invention is rotatably guided relative to the cylinder means, at least so that the pushed out of the cylinder means or push out longitudinal groove, as rotatably guided, not against the typically fixedly attached to the cylinder means detector means not twisted and so along a complete measuring path (measuring path), a homogeneous measurement and thus a constant, reliable and especially for stressed operating environments suitable signal quality can be achieved.
  • the present invention makes it possible, in an advantageous manner, for the magnetically coded strip, prior to insertion into the longitudinal groove of the piston rod, to be magnetized externally and detached from it, of high quality, suitable for series production and with customary magnetization technologies, so that in particular also complex and potentially high-resolution Coding patterns, both relative and absolute-acting codings are generated.
  • a ready magnetically coded strip is introduced into the longitudinal groove, for example by pressing, folding or curling, wherein, according to a preferred embodiment of the invention, the coded strip radially outside a metallic cover strip assigned (superimposed), the magnetic itself is nonconductive and usually extends along the coded strip (more preferably along the entire length of the magnetically coded strip).
  • This cover strip is also designed so that it closes the longitudinal groove coat or on the outside, more preferably and in the context of particularly favorable developments of the invention this closure gaps and / or infinitely, so that approximately in the case of a cylindrical, plunger-like piston rod, this obtains a homogeneous cylindrical shell or outer surface and thus in particular also actuating applications, in which the piston rod cooperates at an end-side engagement end with a setting or actuation partner, remain unimpaired.
  • this cover strip is preferably metallic, so that usually in the context of the production of the coded piston rod, namely after the introduction of the magnetically coded strip and the application of the cover strip thereon in the longitudinal groove, this arrangement for effecting the further advantageous planar uniformity (ie step and gapless closing) nor a metalworking is required, which can be done in an otherwise known manner by grinding and / or by a metal cutting machining.
  • this anticorrosive layer prevents inadvertent corrosion of the masking tape and is more preferably produced as a thin film by an electrochemical coating process, alternatively by a vapor deposition process.
  • the cover strip applied to the magnetically coded strip is advantageous according to the invention and has a further development of chromium-nickel steel, which combines favorable, non-magnetic properties (in order to permit a scanning of the code strip from radially outside) with favorable mechanical properties.
  • the then appropriately sanded or adapted to the cylindrical outer surface of the plunger (piston rod) cover strip is then coated with a corrosion layer, which is typically between 10 .mu.m and 50 .mu.m thick, protects the cover strip and possibly also circumferentially applied to the entire cylinder.
  • a magnetic field detector (as an arrangement of one or a plurality of the code strip through the cover strip through magnetically cooperating sensors) is provided at an end or output region of the cylinder (cylinder means) that along the for Length measurement provided along the detector path and this magnetic field detection potentially more continuous, even if, in the context of alternative embodiments, only at predetermined times or otherwise discontinuous detection can be set up.
  • an absolute position detection is possible (with the associated advantage that, even without a defined piston rod initial position or with the possibility of interim sensor deactivation), a current relative position of the piston rod (and thus also the piston means) relative to the cylinder means is detectable.
  • an incremental or relative coding can also be provided, in which starting usually from a stop, end or fixed position, then a current relative position can be determined by continuous measurement. It is also possible in all these cases in an otherwise known manner by interpolation and using further, provided in predetermined phase positions magnetic field sensors interpolation or detail resolution of such a measurement.
  • the present invention is suitable in principle for almost any applications and is in particular able to ensure a reliable position or travel or movement detection for a large extension length of the piston rod from the cylinder means.
  • the high signal and detector quality makes the invention particularly suitable for applications in which it depends on a high precision of this measurement, without that environmental influences such as pollution or heat can have significantly harmful effects here.
  • the present invention is not limited to this technology, but more particularly, it is also an alternative piston-cylinder device, such as pneumatic cylinders or the like.
  • the Fig. 1 shows in the schematic longitudinal sectional view of a hydraulic cylinder device having a in a cylinder 10 (cylinder means) guided piston unit (piston means) 12.
  • the piston rod 14 extends out of the cylinder 10 in response to a filling of a pressure chamber 11 with hydraulic fluid along a direction of movement 16.
  • the piston rod 14 is provided with a longitudinal groove 18 which extends axially parallel along the extension of the piston rod 14 and, as the associated cross-sectional view of Fig. 2 illustrated, is provided for magnetic interaction with a magnetic detector unit 20 at the exit end of the cylinder 10.
  • the piston unit 12 is guided rotatably in the cylinder 10, so that in particular the relative position between the groove 18 and the sensor unit 20 shown schematically is invariable.
  • a magnetically coded strip 22 is introduced, which consists of a magnetized or magnetizable particles provided polymer in an otherwise known manner and, according to the intended use of the device, with an absolute or an incremental or periodic coding is provided.
  • Magnetic field detectors contained in the detector unit 20 detect this magnetization in the (usually non-contact) confronting with the plunger 14 and set this in otherwise known Way in a position and / or motion signal for further electronic evaluation.
  • the magnetically coded strip 22 on the bottom side has a metallic return path strip. Opposite this is the magnetically coded strip 22 covered with a cover strip 24 made of a Cr-Ni steel material, which, after being inserted into the groove 18, into the cylindrical shape (thus the circular shape of the sectional view of Fig. 2 ) was sanded. This arrangement in turn is provided after the grinding with a corrosion protection layer, which (again in otherwise known manner) was deposited electrochemically on the cover strip.
  • approximately the magnetically coded band 22 (including the return band) has a thickness typically between 1.5 mm and 2 mm, so that then the cover band 24, with a typical groove depth of 5-6 mm, approximately 3 mm to 4 mm , 5 mm thick (at its thickest point).
  • the applied corrosion protection layer 26 does not significantly fall with a typical thickness of about 20 ⁇ m to 30 ⁇ m with regard to the radial extent.
  • the present invention is not limited to the embodiment shown or the dimensioning described only by way of example, but almost any embodiments, both the (hydraulic) cylinder device itself and the further embodiment of the longitudinal groove with coding provided therein are possible, so according to a respective and with regard to an extension length to be monitored positioning purpose adaptability to almost any conditions exists.

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  • 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)
EP17180250.7A 2016-09-07 2017-07-07 Dispositif piston/cylindre et son utilisation Withdrawn EP3293402A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016116780.0A DE102016116780A1 (de) 2016-09-07 2016-09-07 Kolben-Zylindervorrichtung und Verwendung einer solchen

Publications (1)

Publication Number Publication Date
EP3293402A1 true EP3293402A1 (fr) 2018-03-14

Family

ID=59313043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17180250.7A Withdrawn EP3293402A1 (fr) 2016-09-07 2017-07-07 Dispositif piston/cylindre et son utilisation

Country Status (2)

Country Link
EP (1) EP3293402A1 (fr)
DE (1) DE102016116780A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9412435U1 (de) * 1994-08-02 1994-09-29 Festo Kg, 73734 Esslingen Arbeitszylinder
EP1217221A2 (fr) * 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
EP1821072A2 (fr) * 2006-02-18 2007-08-22 Festo Ag & Co. Dispositif destiné à la saisie de la position axiale et/ou la position d'inclinaison d'un corps
US20130312601A1 (en) * 2012-05-24 2013-11-28 Caterpillar Inc. Sensor coupler for piston-cylinder assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9412435U1 (de) * 1994-08-02 1994-09-29 Festo Kg, 73734 Esslingen Arbeitszylinder
EP1217221A2 (fr) * 2000-12-20 2002-06-26 Hoerbiger Hydraulik GmbH Vérin
EP1821072A2 (fr) * 2006-02-18 2007-08-22 Festo Ag & Co. Dispositif destiné à la saisie de la position axiale et/ou la position d'inclinaison d'un corps
US20130312601A1 (en) * 2012-05-24 2013-11-28 Caterpillar Inc. Sensor coupler for piston-cylinder assembly

Also Published As

Publication number Publication date
DE102016116780A1 (de) 2018-03-08

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