EP1255045B1 - Vérin avec un capteur coulissable pour détecter la position du piston - Google Patents

Vérin avec un capteur coulissable pour détecter la position du piston Download PDF

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Publication number
EP1255045B1
EP1255045B1 EP20020009289 EP02009289A EP1255045B1 EP 1255045 B1 EP1255045 B1 EP 1255045B1 EP 20020009289 EP20020009289 EP 20020009289 EP 02009289 A EP02009289 A EP 02009289A EP 1255045 B1 EP1255045 B1 EP 1255045B1
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EP
European Patent Office
Prior art keywords
sensor
channel
pressure cylinder
magnetic
cylinder 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.)
Expired - Lifetime
Application number
EP20020009289
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German (de)
English (en)
Other versions
EP1255045A3 (fr
EP1255045A2 (fr
Inventor
Ernst-August Meyer
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.)
Aventics GmbH
Original Assignee
Rexroth Mecman GmbH
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
Priority claimed from DE10152178A external-priority patent/DE10152178C2/de
Application filed by Rexroth Mecman GmbH filed Critical Rexroth Mecman GmbH
Publication of EP1255045A2 publication Critical patent/EP1255045A2/fr
Publication of EP1255045A3 publication Critical patent/EP1255045A3/fr
Application granted granted Critical
Publication of EP1255045B1 publication Critical patent/EP1255045B1/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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the present invention relates to a pressure medium cylinder for generating a mechanical force, with one of a cylinder bottom and a cylinder cover closed at the end cylinder tube, in which one with pressure medium at least one side acted upon piston is arranged longitudinally displaceable, of which a Cylinder cover sealed penetrating piston rod emanates, where for the detection of Piston position at least one sensor is mounted longitudinally displaceable on the cylinder tube.
  • a generic pressure cylinder comes from the catalog "Know-How in Pneumatics" Rexroth Mecman GmbH (Print No. 00010 006 01, page 1.235).
  • Pressure medium cylinder consists essentially of a cylinder tube with internal Piston and piston rod, at the end of a cylinder bottom and a cylinder cover over outside along the cylinder tube extending tie rods is attached.
  • the tie rods serve Here also the attachment of a sensor, which determines the position of the im Cylinder tube extending piston detected and on the tie rod after loosening a Clamping screw is slidable, so that a mounting / dismounting or adjustment of Make sensor.
  • the sensor usually works according to the induction principle. This is mostly in the piston embedded a corresponding magnetic element, so that at an approximation of the Piston to the sensor herein is an electrical voltage is induced as a measured value.
  • the position of the piston which can be determined via the sensor usually becomes a superordinate one Control unit for controlling the admission of the pressure medium cylinder available posed. Frequently are also arranged with two end of the cylinder tube sensors detects the two end positions of the piston. Due to the exposed arrangement the extent at least one sensor on the cylinder tube, it may be undesirable Dirt accumulations in this area come. Furthermore, the sensor is not sufficiently protected against external forces, so that it leads to an adjustment of Position of the sensor and thus can lead to a faulty position determination.
  • the senor as a result of the exposed attachment outside of the cylinder tube also be exposed to destruction. Furthermore, the assembly / disassembly or requires Adjustment of the sensor quite a complicated previous loosening or tightening the Clamping screw.
  • DE 197 167 36 A1 is proposed in DE Sensor within a groove-like along the cylinder tube extending recess accommodate and then the outwardly open groove-like recess by means to close a matched to the outer contour of the cylinder tube cover.
  • a dirt-proof housing a sensor to a Cylinder tube however, this does not guarantee safe moisture protection be because moisture through the area of engagement of the cover on Cylinder tube can get into the groove-like recess.
  • also here for Attaching the sensor uses a clamping screw, which is quite a complicated Assembly / disassembly or adjustment caused.
  • the invention is based on a pressure medium cylinder according to the preamble of Claim 1 solved in conjunction with its characterizing features.
  • the following dependent claims give advantageous developments of the invention again.
  • the invention includes the technical teaching that the sealed housing of the Sensor in the wall region of the non-magnetic cylinder tube at least one axis-parallel closed channel is provided, in which the sensor via magnetic operable non-positive or positive fastening means is locked.
  • the advantage of the solution according to the invention lies in the fact that despite the sensor only the cylinder tube determines the outer contour of the pressure cylinder, so that a smooth, even and rugged outer surface of the pressure cylinder is maintained, where dirt can not accumulate and settle. Because the sensor from the channel completely surrounded, because of this sealing moisture can not reach the sensor reach. For sealing, only the frontal outlet openings of the channel are closed close. This is preferably done by the cylinder cover or bottom. By the Solution according to the invention, the sensor is also completely protected from contact, so that avoided an unwanted adjustment as a result of a disturbing external force becomes. By magnetically actuated fasteners of screws or the like for attachment, which also in view of the closed channel not usable here. For the inventive magnetic actuation of the closed channel but not an obstacle, as far as the cylinder tube surrounding it a non-magnetic material - preferably plastic or aluminum - consists.
  • the fastening means of the sensor via an externally acting Magnetic tool for adjusting the sensor by means of magnetic force solvable, wherein at Removal of Magnetjustierwerkmaschines again their automatic locking takes place.
  • This Simple special tool can be designed as a permanent magnet or as an electromagnet be. Since only the owner of the special tool can make a sensor adjustment, the in addition, knowledge about the effect of the externally invisible Fasteners must be prevented from unauthorized operation.
  • the fastening means a comprise latching element arranged on the end side of a spring section, which in a form-fitting manner a trained in the channel corresponding teeth comes into engagement or the just comes frictionally on the inner wall of the channel to the plant. In the latter case Reaches the surface roughness of the channel wall in conjunction with the locking element exerted spring pressure to ensure a reliable lock.
  • a toothing contained in the channel can in a particularly simple manner by the Inserting a threaded hole can be formed in the channel.
  • the teeth in the manner of an axially along the channel and running at least a portion of the cross-sectional profile of the channel engaging toothing portion train.
  • a separate rack provided in a corresponding groove-like recess is inserted along the channel.
  • the fastening means of Sensor may also be formed as a magnetic or iron-metallic contact element, the frictionally fitted with the corresponding magnetic means Inner wall of the channel interacts.
  • the magnetic means are after Type of running along the channel magnetic tape configured by gluing or The like can be attached to the inner wall of the channel.
  • the channel can be seen in cross section from a sensor section for displaceable mounting of the sensor and a parallel, Overlying cable section for accommodating an outgoing from the sensor Sensor cables are made, which preferably extends U-shaped within the channel.
  • the sensor section can be seen in cross-section of Have a circular shape deviating profile, with a corresponding profile of the Sensor cooperates to a rotation of the sensor within the sensor section (to avoid.
  • Another measure improving the invention provides that the locking element a Magnetic pill or a different shaped permanent magnet element is attached, the / with cooperates with the magnetic tool from the outside. This measure serves a facilitated release of the fastening means, as a result of the magnetic force is increased between the locking element and the magnetic tool.
  • Alternative to Magnetic tool it is also conceivable to use an iron or soft iron tool as a tool for Adjustment of the sensor to use, if that of the magnetic pill on the locking element outgoing magnetic force allows this, i. a reliable strong interaction exists.
  • An iron or soft iron tool as a tool for adjusting the sensor also has the advantage that this improper handling the inductive sensor not for Switching can bring.
  • the non-magnetic cylinder tube has a substantially square External profile on.
  • a channel is provided in each area.
  • the square cylinder tube in Side edge region has sufficient material thickness and on the other hand in an adjacent Arrangement of two channels a certain side surface of the square cylinder tube for the operation of the sensors is defined, which facilitates the operation.
  • a display element is suitable a light emitting diode (LED) or the like.
  • the pressure medium cylinder of Figure 1 is a pneumatic cylinder, which consists of a cylinder tube 1 consists of aluminum, which has a substantially square outer cross-section and a round inner cross section for a - not visible here - piston, the longitudinally displaceable within the cylinder tube 1 and with compressed air on both sides is arranged acted upon.
  • On one side of the piston is coaxial with a piston rod 2, the sealed penetrates a cylinder cover 3, which leads to a harvest of the cylinder tube. 1 is fastened by screws 5.
  • the piston rod 2 penetrates the cylinder cover 3 via a intermediate sealing element 6, which also with a dirt wiper for Piston rod 2 is provided.
  • the cylinder tube 1 is at its opposite end with a cylinder bottom 4 closed, which also by means of a screw on the Cylinder tube 1 is attached. Overall, the inventively designed Pressure medium cylinder thus a substantially cuboid shape.
  • the broken-open area of the cylinder tube 1 defines a closed channel 7 free.
  • the closed channel 7 is aligned parallel to the axis of the cylinder tube 1 and extends in the region of a side edge of the cylinder tube 1.
  • the channel 7 is above the cylinder cover. 3 on the one hand and the cylinder bottom 4 on the other end closed.
  • the sensors 8a and 8b are according to Art formed inductive sensors. Of the sensors 8a, 8b are each electrical Sensor cable 9a, 9b off, which the electrical sensor signal to one - not here shown - forward control unit.
  • the sensor cables 9a, 9b are U-shaped within the Kanal 7 housed.
  • Each sensor 8 is in the channel 7 - here positively locked - locked.
  • to Locking is formed by the channel 7 by a toothing.
  • the gearing is by an axially along the channel 7 extending and the lower part of the Cross-sectional profile of the channel 7 engaging toothed portion formed. This Gear section is made here constructively by a separate rack 10, the longitudinally in a corresponding groove-like recess along the channel. 7 is inserted.
  • those arranged on the part of the sensor 8 comprise Attachment means a spring portion 11, which on the outer surface of the sensor 8 to one end is attached and the other end terminates in a locking element 12.
  • the Raster element 12 comes positively in the trained in the channel 7 teeth Intervention.
  • These fastening means of the sensor 8 are acting on an externally Magnetic tool 13, which consists in principle of a strong permanent magnet, solvable by magnetic force, with an independent locking when removing the Magnetic tool 13 takes place due to the spring force performed by the spring portion 11.
  • a magnetic pill 14th is glued.
  • the channel 7 is made of a sensor section 15 for locking the Sensor 8 and an adjacent cable section 16 for accommodating the sensor of the 8th outgoing sensor cable 9, so that the sensor 8 is unhindered by the sensor cable 9 can move, the sensor cable 9 is below the sensor 8 through the central region of Rack 10 passed through to the outside.
  • the sensor cable 9 At the exit point of the sensor cable 9 off the cylinder tube 1 is the sensor cable 9 with an optical display element 17 for Display of the operating state of the sensor 8 connected.
  • the optical display element 17 is designed here as a light-emitting diode and in one of the channel 7 of the cylinder tube 1 after Glued outside leading bore.
  • the present invention is not limited to the above description Embodiment. On the contrary, modifications of this kind are conceivable which can be found in the Protected area of the following claims intervene.
  • the invention not limited to only positive fastening means. It is also conceivable that Fastener between the sensor 8 and the channel 7 frictionally, form for example, via a running along the channel 7 magnetic tape. With appropriate Polarization here, the sensor 8 also via the magnetic tool 13 to simple Manner be mounted / dismounted or adjusted, the sensor 8 completely from Outer environmental influences sealed within the channel 7 is housed without the Channel determines the outer shape of the pressure cylinder.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Claims (14)

  1. Vérin à fluide sous pression pour générer une force mécanique, comportant un tube de vérin (1) fermé du côté extrémité par un fond de vérin (4) ainsi que par un couvercle de vérin (3) et dans lequel est agencé en translation longitudinale un piston susceptible d'être sollicité du moins sur un côté par un fluide sous pression, à partir duquel s'étend une tige de piston (2) traversant avec étanchement le couvercle de vérin (3), dans lequel au moins un détecteur (8) destiné à la détection de la position du piston est monté en translation longitudinale sur le tube de vérin (1), caractérisé en ce que pour le logement étanché du détecteur (8) dans la zone de paroi du tube de vérin amagnétique (1), il est prévu au moins un canal fermé (7) parallèle à l'axe, dans lequel le détecteur (8) est arrêté par des moyens de fixation à coopération de forces ou de formes et à actionnement magnétique.
  2. Vérin à fluide sous pression selon la revendication 1, caractérisé en ce que les moyens de fixation du détecteur (8) sont détachables par un outil magnétique (13) agissant depuis l'extérieur et destiné à déplacer le détecteur (8) par force magnétique, leur arrêt s'effectuant automatiquement en cas d'enlèvement de l'outil magnétique (13).
  3. Vérin à fluide sous pression selon la revendication 1, caractérisé en ce que les moyens de fixation comprennent un élément d'enclenchement (12) qui est agencé du côté extrémité d'un tronçon ressort (11) et qui vient s'engager par coopération de formes dans une denture correspondante réalisée dans le canal (7) ou qui vient en appui par coopération de forces contre la paroi intérieure du canal (7).
  4. Vérin à fluide sous pression selon la revendication 3, caractérisé en ce que la denture est réalisée en ménageant un perçage taraudé dans le canal (7).
  5. Vérin à fluide sous pression selon la revendication 3, caractérisé en ce que la denture est réalisée à la manière d'un tronçon de denture s'étendant axialement le long du canal (7) et occupant une partie du profil de section transversale du canal (7).
  6. Vérin à fluide sous pression selon la revendication 5, caractérisé en ce que le tronçon de denture est formé par une crémaillère séparée (10) qui est enfilée dans un évidement correspondant en forme de gorge le long du canal (7).
  7. Vérin à fluide sous pression selon la revendication 1, caractérisé en ce que les moyens de fixation du détecteur (8) comprennent un élément de contact magnétique ou en métal ferreux qui coopère par coopération de forces contre la paroi intérieure du canal (7) munie de moyens magnétiques correspondants.
  8. Vérin à fluide sous pression selon la revendication 7, caractérisé en ce que les moyens magnétiques sont réalisés à la manière d'une bande magnétique s'étendant le long du canal.
  9. Vérin à fluide sous pression selon la revendication 1, caractérisé en ce que le canal (7) est constitué, vu en coupe transversale, par un tronçon de détecteur (15) pour la fixation mobile du détecteur (8) et par un tronçon de câble parallèle (16) pour loger un câble de détecteur (9) partant du détecteur (8).
  10. Vérin à fluide sous pression selon la revendication 9, caractérisé en ce que le tronçon de détecteur (10) présente, vu en coupe transversale, un profil qui diffère d'une forme circulaire et qui coopère avec un profil correspondant du détecteur (8), afin d'éviter une rotation du détecteur (8) à l'intérieur du tronçon de détecteur (15).
  11. Vérin à fluide sous pression selon la revendication 3, caractérisé en ce que pour faciliter un détachement des moyens de fixation, il est prévu une pastille magnétique (14) qui est agencée stationnaire par rapport à l'élément d'enclenchement (12) et qui coopère depuis l'extérieur avec l'outil magnétique (13) ou avec un outil en fer ou en fer doux.
  12. Vérin à fluide sous pression selon l'une des revendications précédentes, caractérisé en ce que le tube de vérin (1) présente un profil extérieur sensiblement carré et est constitué en un métal léger ou en une matière plastique.
  13. Vérin à fluide sous pression selon la revendication 12, caractérisé en ce que pour loger des détecteurs (8), il est prévu un canal respectif (7a, 7b) sur des arêtes latérales voisines du tube de vérin (1).
  14. Vérin à fluide sous pression selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un perçage menant depuis le canal fermé (7) du tube de vérin (1) vers l'extérieur, dans lequel est mis en place un élément d'affichage optique (17) connecté électriquement au détecteur (8), afin d'afficher l'état de fonctionnement du détecteur (8).
EP20020009289 2001-04-30 2002-04-29 Vérin avec un capteur coulissable pour détecter la position du piston Expired - Lifetime EP1255045B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10121190 2001-04-30
DE10121190 2001-04-30
DE10152178A DE10152178C2 (de) 2001-04-30 2001-10-23 Druckmittelzylinder mit einem verschiebbaren Sensor zur Detektion der Kolbenstellung
DE10152178 2001-10-23

Publications (3)

Publication Number Publication Date
EP1255045A2 EP1255045A2 (fr) 2002-11-06
EP1255045A3 EP1255045A3 (fr) 2004-02-25
EP1255045B1 true EP1255045B1 (fr) 2005-08-24

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Application Number Title Priority Date Filing Date
EP20020009289 Expired - Lifetime EP1255045B1 (fr) 2001-04-30 2002-04-29 Vérin avec un capteur coulissable pour détecter la position du piston

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EP (1) EP1255045B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2009292A2 (fr) 2007-06-26 2008-12-31 Robert Bosch GmbH Cylindre pneumatique doté d'un boîtier cylindrique en métal extrudé

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013011667A1 (de) * 2013-07-12 2015-01-15 Festo Ag & Co. Kg Positionssensor, Aktor zur Bereitstellung einer Bewegung und Verfahren zum Anbringen eines Positionssensors
DE102015000546A1 (de) * 2015-01-31 2016-08-04 Festo Ag & Co. Kg Positionssensor, Aktor zur Bereitstellung einer Bewegung und Verfahren zum Anbringen eines Positionssensors

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19716736C2 (de) 1997-04-14 2002-02-07 Rexroth Mecman Gmbh Einrichtung zur Sensorbefestigung
DE29816156U1 (de) * 1998-09-09 1998-11-26 Festo Ag & Co Linearantrieb
DE10210636C1 (de) * 2002-03-11 2003-05-22 Imi Norgren Gmbh Fluidbetätigter Arbeitszylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2009292A2 (fr) 2007-06-26 2008-12-31 Robert Bosch GmbH Cylindre pneumatique doté d'un boîtier cylindrique en métal extrudé
DE102007029628B3 (de) * 2007-06-26 2009-01-15 Robert Bosch Gmbh Pneumatikzylinder mit einem Zylindergehäuse aus stranggepresstem Metall

Also Published As

Publication number Publication date
EP1255045A3 (fr) 2004-02-25
EP1255045A2 (fr) 2002-11-06

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