EP1284372B1 - Druckmittelzylinder und Positionsanzeigegerät - Google Patents

Druckmittelzylinder und Positionsanzeigegerät Download PDF

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Publication number
EP1284372B1
EP1284372B1 EP20020445099 EP02445099A EP1284372B1 EP 1284372 B1 EP1284372 B1 EP 1284372B1 EP 20020445099 EP20020445099 EP 20020445099 EP 02445099 A EP02445099 A EP 02445099A EP 1284372 B1 EP1284372 B1 EP 1284372B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
light
pressure fluid
channel
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
EP20020445099
Other languages
English (en)
French (fr)
Other versions
EP1284372A1 (de
Inventor
Rune Granberg
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.)
Bosch Rexroth Teknik AB
Original Assignee
Bosch Rexroth Teknik AB
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 Bosch Rexroth Teknik AB filed Critical Bosch Rexroth Teknik AB
Publication of EP1284372A1 publication Critical patent/EP1284372A1/de
Application granted granted Critical
Publication of EP1284372B1 publication Critical patent/EP1284372B1/de
Anticipated expiration legal-status Critical
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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
    • 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

Definitions

  • the invention concerns an indicating device according to the preamble of claim 1.
  • the invention also concerns a pressure fluid cylinder according to the preamble of claim 7.
  • pressure fluid cylinders of the kind including a cylinder tube and a moveable piston
  • sensors for detecting, for example, an end position of the piston inside the cylinder.
  • the supply to the cylinder may be controlled so that the piston is brought to a stop or be reversed.
  • a light source which is activated by the sensor and may be perceived by an operator in order to facilitate adjustment etc.
  • a device is previously known from WO 00/68579, wherein switches may be installed in axial channels in the cylinder tube wall and over cables be arranged to activate a light source, which is positioned in a cylinder end wall as a response to the presence of a piston with a built-in magnet.
  • This device is complicated as to its construction and necessitates drawing of cables to the fixed light source.
  • EP 676550 discloses an indicating device according to the preamble of claim 1.
  • the axial channels for receiving the sensor elements are covered with optically transparent band allowing a visual indication radially through each band.
  • the long joints between the bands and the channel walls make this solution exposed to leakage.
  • the light source being a light emitting diode
  • the light transmitting element including a reflecting mirror surface for the transmission of light at an angle to the extension direction of the channel, it is achieved that the indication will be clearly visible from the side of the cylinder at a right angle to its axis, which is normally the prevailing looking direction when controlling the cylinder.
  • a pressure fluid cylinder 1 including a cylinder tube 2 and two cylinder end walls 3 and 4. Inside the cylinder tube 2 a piston 5 is axially moveable, and is attached to a piston rod 6, which is sealingly extending through the cylinder end wall 4.
  • an axial channel 7 for receiving a sensor unit 8, which includes on the one hand a piston position sensor in the form of an electrical or mechanical switch (per see known and therefore not shown) with the ability to sense when the piston 5 is in a close position, on the other hand a light source in the form of a light emitting diode.
  • a sensor unit 8 which includes on the one hand a piston position sensor in the form of an electrical or mechanical switch (per see known and therefore not shown) with the ability to sense when the piston 5 is in a close position, on the other hand a light source in the form of a light emitting diode.
  • Light emanating from the light source is indicated at 9 and radiates axially through the axial channel 7 when the piston position sensor is activated.
  • the light 9 meets a light transmitting element 10, which has an essentially plane entrance surface 11 for light and a reflecting prism surface 22 at essentially 45° with respect to the extension direction of the channel 7.
  • the element 10 is mounted sealingly in the end wall 4 with the aid of a per se known sealing device or possibly direct sealing against the end wall.
  • the axial channel 7 continues also through the cylinder end wall 3, through which cabling 13 to the sensor unit 8 extends, so as to penetrate a packing at the mouth of the channel, said packing 14 on the one hand operating as a sealing device for the channel, on the other hand may be functioning as a fixation device for the sensor unit 8.
  • This may be obtained by having a pressing screw 15 being arranged outside the packing 14, said screw when screwing it inwards pressing the packing 14 such that it will sealingly and fixingly adjoin to the cable comprising the cabling 13. If the sensor unit 8 is to be adjusted, the screw 15 is loosened, whereby the packing 14 is relieved, allowing displacement of the cable comprising the cabling 13 and thereby axial adjustment of the sensor unit 8.
  • a light transmitting element 16 being position in an axial continuation of the channel 7.
  • Light emanating from the light source in the sensor unit will in this case be emitted essentially axially, let be scattered, over a convex surface 17 belonging to the light transmitting element 16, so as to be best visible from the end of the pressure fluid cylinder, but to a certain degree, due to the convex surface 17, also from the side of the cylinder.
  • Fig. 1 there is also indicated a ring shaped magnet 18, which is of a per se previously known kind, and which is positioned centrally as seen axially and at the outer portion of the piston 5 as seen radially.
  • the piston with the associated magnet is located in a position adjacent to the sensor unit 8, in which position this piston position sensor with the associated micro-switch and light source is activated.
  • the pressure fluid cylinder 1 is provided with two channels 7 and 7', whereof the latter receives a second piston position sensor 8', which is provided with an associated cabling 13' and associated light transmitting element 10'.
  • This embodiment allows for the pistons two end positions to be detected and indicated.
  • the invention may be modified within the scope of the annexed claims and in particularly the separate elements such as switch and light source be otherwise and also be assembled otherwise than what is indicated above.
  • the light source must not be mounted with the piston position sensor to a sensor unit, these means may be connected to each other but be separated axially and sideways.
  • the light transmitting elements may be constructed otherwise and as an example also come from lead-through holes in the cylinder tube itself. It is also possible to use light-guides of fibreglass for directing light as an alternative to the shown embodiment.
  • the cable should be rigid in order to facilitate positioning in the channel and its thickness should not deviate too much from the dimension of the channel so as to avoid sideways movements of the cable inside the channel. Also other methods for positioning the sensor unit inside the channel than what is shown are within the scope the invention, for example with a displacement tool in order to press the sensor unit in an axial direction.
  • the invention is applicable in all kinds of pressure fluid cylinders, also with rod-less slot cylinders.
  • the magnet may be position otherwise than axially central in the piston, for example at one axial end of the piston.
  • the cylinder tube 2 is made from a non magnetic material such as aluminium or an aluminium alloy for allowing the magnetic field from the magnet in the piston to have effect through the material.
  • An advantage with aluminium or the like is that light emanating from the light source without greater losses will be reflected in the walls of the axial channel if the cylinder tube is manufactured through a extrusion procedure, wherein shiny channel walls will be obtained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (10)

  1. Anzeigevorrichtung zur Anzeige der Position eines Kolbens (5) innerhalb eines Zylinderrohres (2) eines Druckmittelzylinders (1), wobei die Anzeigevorrichtung einerseits einen Kolbenpositionssensor für eine Feststellung in einer gewählten Position entlang der Länge des Zylinderrohres für die Erkennung des Vorhandenseins des Kolbens in der Position und andererseits eine Lichtquelle für eine Ansteuerung und eine Anzeige aufweist, wenn der Kolben in der Position vorhanden ist, wobei die Lichtquelle mit dem Kolbenpositionssensor zur Bildung einer Sensoreinheit (8) verbunden ist, wobei die Sensoreinheit (8) zur Feststellung in einem sich axial erstreckenden Kanal (7) in der Wandung der Zylinderröhre ausgebildet ist, und wobei ein lichtleitendes Element (10;16) zur Emission von Licht der Sensoreinheit an die Außenseite des Druckmittelzylinders angeordnet ist,
    dadurch gekennzeichnet, dass
    die Lichtquelle zur axialen Emission von Licht durch den Kanal angeordnet ist,
    dass das lichtleitende Element (10;16) für die Anordnung an einer axialen Position des Kanals ausgeführt ist, und dass es ein Mittel zur Übertragung des Lichtes in Richtungen unter einem Winkel entsprechend der sich axial erstreckenden Richtung des Kanals aufweist.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Lichtquelle eine Licht emittierende Diode ist.
  3. Vorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass das lichtleitende Element (10;16) in einem gegen die Wandung des Druckmittelzylinders dichtenden Element eingefasst ist.
  4. Vorrichtung nach Anspruch 1,2 oder 3,
    dadurch gekennzeichnet, dass das lichtleitende Element (10) eine reflektierende Oberfläche (22) zur Übertragung des Lichtes in Richtungen unter einem Winkel entsprechend der Ausdehnungsrichtung des Kanals aufweist.
  5. Vorrichtung nach Anspruch 4,
    dadurch gekennzeichnet, dass die reflektierende Oberfläche (22) die Oberfläche eines Prismas ist.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass die Sensoreinheit (8) einen magnetbetätigten Schalter aufweist.
  7. Druckmittelzylinder (1), umfassend ein Zylinderrohr (2) mit einem Kolben (5), wobei dieser hierin längs einer Achse des Zylinderrohres beweglich ist und ein Anzeigemittel (8, 10) gemäß einem der Ansprüche 1 bis 6 aufweist.
  8. Zylinder gemäß Anspruch 7,
    dadurch gekennzeichnet, dass dieser eine Abdichtung (14) zur Dichtung zwischen einer Wandung (3) des Druckmittelzylinders und einer mit der Sensoreinheit (8) in Verbindung stehenden Verkabelung (13) aufweist.
  9. Zylinder nach Anspruch 7 oder 8,
    dadurch gekennzeichnet, dass der Kolben (5) zumindest einem Permanentmagneten (18) aufweist.
  10. Zylinder nach einem der Ansprüche 7 bis 9,
    dadurch gekennzeichnet, dass dieser eine Vielzahl von Anzeigevorrichtungen (8, 10; 16) zur Anzeige verschiedener Kolbenpositionen aufweist.
EP20020445099 2001-08-15 2002-07-25 Druckmittelzylinder und Positionsanzeigegerät Expired - Lifetime EP1284372B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0102723A SE0102723L (sv) 2001-08-15 2001-08-15 Tryckfluidcylinder jämte indikeringsanordning därför
SE0102723 2001-08-15

Publications (2)

Publication Number Publication Date
EP1284372A1 EP1284372A1 (de) 2003-02-19
EP1284372B1 true EP1284372B1 (de) 2005-09-14

Family

ID=20285031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020445099 Expired - Lifetime EP1284372B1 (de) 2001-08-15 2002-07-25 Druckmittelzylinder und Positionsanzeigegerät

Country Status (3)

Country Link
EP (1) EP1284372B1 (de)
DE (1) DE60206115D1 (de)
SE (1) SE0102723L (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10306461B4 (de) * 2003-02-17 2007-06-14 Imi Norgren Gmbh Fluidbetätigter Arbeitszylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01170801A (ja) * 1987-12-25 1989-07-05 Ckd Corp 流体圧シリンダのピストン位置検出装置
DE4027199A1 (de) * 1990-08-28 1991-01-03 Siemens Ag Anordnung zur messung der position eines beweglichen koerpers
DE4137586A1 (de) 1991-11-15 1993-05-19 Frank Rueger Vorrichtung zur feststellung einer kolbenstellung in einem zylinder
DE4408639C2 (de) * 1994-03-09 1998-04-16 Mannesmann Ag Arbeitszylinder mit einem Zylindergehäuseprofil
DE19921474A1 (de) 1999-05-08 2001-01-18 Festo Ag & Co Anzeigeeinrichtung

Also Published As

Publication number Publication date
SE517799C2 (sv) 2002-07-16
DE60206115D1 (de) 2005-10-20
SE0102723L (sv) 2002-07-16
SE0102723D0 (sv) 2001-08-15
EP1284372A1 (de) 2003-02-19

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