EP0775835A2 - Appareil de détection de position - Google Patents

Appareil de détection de position Download PDF

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Publication number
EP0775835A2
EP0775835A2 EP96113214A EP96113214A EP0775835A2 EP 0775835 A2 EP0775835 A2 EP 0775835A2 EP 96113214 A EP96113214 A EP 96113214A EP 96113214 A EP96113214 A EP 96113214A EP 0775835 A2 EP0775835 A2 EP 0775835A2
Authority
EP
European Patent Office
Prior art keywords
sensor
position detection
detection device
signal
signal conductor
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
EP96113214A
Other languages
German (de)
English (en)
Other versions
EP0775835A3 (fr
EP0775835B1 (fr
Inventor
Kurt Dr. Stoll
Michael Streck
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 EP0775835A2 publication Critical patent/EP0775835A2/fr
Publication of EP0775835A3 publication Critical patent/EP0775835A3/fr
Application granted granted Critical
Publication of EP0775835B1 publication Critical patent/EP0775835B1/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
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B15/2853—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using potentiometers
    • 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

Definitions

  • the invention relates to a position detection device for detecting a plurality of relative positions between two components which can be moved relative to one another, with a sensor device which is fixed or can be fixed on one of the two components, which has a signal conductor arrangement with at least one signal conductor connected to an evaluation device and at least two in working positions at different longitudinal positions of the signal conductor arrangement sensor units that can be positioned and contacted in the working positions with at least one signal conductor of the signal conductor arrangement and containing a sensor.
  • a position detection device of this type emerges from DE 39 23 063 C2. It comprises a signal conductor arrangement with a plurality of signal conductors designed as conductor tracks, which are arranged on the circumference of the housing of a working cylinder. Sensor units equipped with so-called reed switches can be positioned continuously in different working positions along the signal conductor arrangement, each with two Signal conductors are contacted, which lead to an evaluation device. When a sensor is actuated, for example by an actuating element arranged on the piston of the working cylinder, a circuit is closed, so that a sensor signal is generated which can be used for further control processes.
  • the known sensor device is still somewhat complex in that a correspondingly large number of signal conductors is required when using a larger number of sensors. This in turn results in a large number of plug-in connections in the signal conductor course to the evaluation device, with which functional impairments can occur over time.
  • DE 32 40 351 A1 has already proposed combining a large number of sensors with a series connection of resistors, so that a resistance chain results and, based on the measured resistance, the excited sensor and thus the relative position of the moving components are concluded can be.
  • this position detection device however, the working position of the individual sensors cannot be changed.
  • a specially designed sensor device is required for every application. Additional sensors are required for more To query relative positions, the sensor device must be replaced by a correspondingly adapted one.
  • each of these multiple sensor units has one Coding device is equipped which, when the assigned sensor is actuated, produces a coding signal which is characteristic of the latter and on the basis of which the evaluation device recognizes the actuated sensor.
  • each sensor unit has a coding device which, when the sensor is actuated, produces a characteristic coding signal which the evaluation device can evaluate and thus deduce the actuated sensor. Since each sensor unit is assigned its own coding device, the system is very flexible and, with the appropriate design of the evaluation device, can be equipped with any number of sensors, which can also be positioned variably along the generally linear signal conductor arrangement.
  • the component equipped with the sensor device consists at least partially of electrically conductive material, a signal conductor is sufficient in principle, since the sensor signals can be fed back via the component itself. However, it is not always desirable or permissible to use the component itself for signal transmission. Out for this reason and also to improve the functional reliability, it is therefore considered advisable to provide the signal conductor arrangement with a plurality, in particular with exactly two signal conductors which are simultaneously assigned to a plurality of sensor units.
  • a respective coding device is preferably designed as a resistance device which, when the associated sensor is actuated, produces a certain electrical resistance which can be evaluated as a coding signal by the connected evaluation device.
  • a respective sensor can be designed as a reed switch or other magnetic field-sensitive element to which an ohmic resistor is connected in series, the ohmic resistances of the different sensor units being different.
  • there is a very specific electrical resistance which can be detected, for example, by measuring the current in the evaluation device and which serves as a coding signal which enables the assigned actuated sensor to be identified with the correct assignment.
  • the signal conductors and the sensor units are expediently housed in a protective housing that prevents damage and soiling of the sensitive ones Parts prevented. It expediently consists of electrically insulating material, so that it can be fixed to the one of the components moving relative to one another without special insulating measures.
  • the protective housing expediently has a removable cover which is placed under a seal and which extends at least approximately over the entire length of the protective housing and makes the interior of the housing readily accessible when removed.
  • the position detection device is very well suited for use in connection with all types of linear drives, in particular in the case of fluid-operated working cylinders, including those without a piston rod type, the simple structure also making retrofitting possible.
  • a linear drive 1 in the form of a fluid-operated working cylinder, in particular a pneumatic cylinder. It has a housing 2, in which a piston 3 is arranged to be axially movable, the drive being effected in a manner known per se via pressure medium connections, not shown, which communicate with the cylinder space containing the piston 3.
  • a piston rod 4 is arranged on the piston 3 and protrudes from the housing 2.
  • a valve device 5 is located directly on the housing 2 is set, via which the pressurization of the piston 3 and thereby its as well as the linear movement of the piston rod 4 is caused as required.
  • Control electronics 6, likewise attached to the linear drive 1 and, for example, fixed to the valve device 5, controls the operating mode of the valve device 5. It can contain its own control program, but is expediently connected via a connecting cable 10 to a higher-level control device which enables the operation of several linear drives 1 and can coordinate other components.
  • the linear drive 1 is equipped with a position detection device 7. It enables the detection of certain relative positions between the housing 2 and the piston 3. It comprises a sensor device 8, which in the exemplary embodiment is fixed on the outside of the housing 2 of the linear drive 1, and an electronic evaluation device 12 connected thereto. The latter communicates with the control electronics 6 via a connecting cable 11.
  • the sensor device 8 of the exemplary embodiment comprises a protective housing 13, which is detachably fixed on the outside of the housing 2 in the stroke region of the piston 3. It has a longitudinal extent and is parallel to the longitudinal axis 14 of the Housing 2 aligned.
  • a longitudinally extending fastening rail 16 is provided on a lower housing part 15 of the protective housing 13. It engages in a form-fitting manner in a longitudinally open fastening groove 17 on the outer circumference of the housing 2.
  • the exemplary fastening groove 17 is designed in the manner of a T-groove and the fastening rail is pushed in at the end. The mutually engaging sections prevent the protective housing 13 from being removed through the groove neck 18 of the fastening groove 17.
  • the protective housing 13 is completed by a housing cover 22 which, in the assembled state, closes a longitudinal housing opening 23 which faces radially away from the housing 2 and via which a sensor receiving space 24 formed in the interior of the protective housing 13 is accessible when the housing cover 22 is removed.
  • the protective housing 13 expediently has a strip-like shape with a box-shaped structure. The end openings are closed by closing elements 25, 25 '.
  • the protective housing 13 is permanently connected at one end to the housing 2 of the linear drive 1 via one, for example the front end element 25, a sliding block connection 26 not shown in detail can be used in which the mounting groove 17 is involved.
  • the opposite end element 25 'in the exemplary embodiment merely forms an intermediate wall, to which the evaluation device 12, which in the exemplary embodiment has a block-like housing, is connected.
  • the latter is screwed onto the front side of the protective housing 13 via fastening screws 27, the plate-like closure element 25 'being clamped in between.
  • Comparable fastening screws 27 serve to fix the front end element 25 to the protective housing 13. Since the evaluation device 12 is also fixed to the housing 2 of the linear drive 1, for example via a sliding block connection 26 ', the sensor device 8 is secured securely to the housing, which here is with the evaluation device 12 practically forms a structural unit.
  • evaluation device 12 If the evaluation device 12 is attached directly to the protective housing 13, it can act as a terminating element, so that an additional intermediate part 25 'is unnecessary.
  • the two end elements 25, 25 'axial projections 28 are provided which, possibly provided with seals, engage on the end face in the sensor receiving space 24 and expediently also bring about a centering between the end elements 25, 25' and the protective housing 13.
  • the housing cover 22 is expediently fixed on the lower housing part 15 in the context of a releasable latching connection 32.
  • two sealing strips 33 are inserted alongside in the sensor receiving space 24 in the lower housing part 15, which have flexible sealing lips 34 facing each other in the area of the housing opening 23, which bear against the fitted housing cover 22 from the inside.
  • the sealing lips 34 protrude a little way from the housing opening 23 according to the dash-dotted representation 31, so that they are bent inwards when the housing cover 22 is placed on it and, due to their rubber elasticity, with a fixed housing cover 22 with a certain pressure against it Be pressed inside.
  • a signal conductor arrangement consisting of a plurality of signal conductors 35 and a plurality of sensor units 38 are accommodated in the sensor accommodation space 24.
  • there are exactly two signal conductors 35 which are connected to Are spaced parallel to each other and parallel to the longitudinal axis 14 of the linear drive 1. They extend in the longitudinal direction of the protective housing 13, where they end freely at the front end of the housing, while at the rear end of the housing they are electrically connected to the evaluation device 12 in the context of a plug connection device 36.
  • the signal conductors 35 are preferably designed as conductor tracks. In the exemplary embodiment, they are embedded and fixed electrically isolated over a part of their circumference in one of the two sealing strips 33 of the sensor device 8. Their uncovered contact section 37, which, for example, protrudes slightly above the sealing strips 33, extends over the entire length of the protective housing 13 or the length of the stroke of the piston 3 of the linear drive 1 that is possible during operation.
  • the signal conductors 35 are expediently metal wires.
  • the sensor units 38 already mentioned have a holder 42 which is clearly visible from FIGS. 3 and 4. Via this holder 42, they are mounted on the protective housing 13 so as to be longitudinally displaceable and can be releasably clamped in any longitudinal position.
  • the cooler 42 is longitudinally displaceable in one by means of a bearing foot 43 which is in particular integrally formed thereon formed on the bottom of the sensor space 24, longitudinally extending fastening recess 44 guided in a longitudinally displaceable manner.
  • the fastening recess 44 expediently protrudes into the fastening rail 16 of the protective housing 13 and thus comes to lie within the fastening groove 17 relatively close to the circumferential area of the cylinder space 9 receiving the piston 3.
  • a fastening device 45 provided on the holder 42 enables the housing unit to be fixed in any longitudinal position of the sensor unit 38, hereinafter referred to as the working position.
  • it cooperates with the fastening recess 44 and has a sliding block 46 running in it, which can be clamped to the walls of the fastening recess 44 via a clamping screw 47 which is accessible from the outside when the housing cover 22 is removed.
  • a respective sensor unit 38 has a sensor 48, which is expediently designed as a magnetic field-sensitive element and, in the case of the exemplary embodiment, is a so-called reed switch.
  • the sensor 48 is actuated when it comes under the influence of a magnetic field.
  • this magnetic field comes from a permanent magnet 49 which is fixedly connected to the piston 3.
  • a relatively weak permanent magnet 49 is sufficient, because the sensor 48 is placed in the bearing base 43 of the holder 42 and thus in the immediate vicinity of the cylinder space 9 or the permanent magnet 49 fixed on the piston 3.
  • the housing 2 of the linear drive 1 expediently consists of non-ferromagnetic material in order not to negatively influence the magnetic field.
  • a sensor signal reaches the evaluation device 12 via the signal conductors 35.
  • the connection between a respective sensor unit 38 and the signal conductors 35 is established by contact elements 53, which are movably attached to the sensor unit 38 and arrive at the installed sensor unit 38 contact portions 37 of the two signal conductors 35.
  • contact elements 53 which are movably attached to the sensor unit 38 and arrive at the installed sensor unit 38 contact portions 37 of the two signal conductors 35.
  • These are expediently resilient contact elements which are designed in particular as sliding contacts, so that they slide along the respectively assigned signal conductor 35 in the longitudinal direction when a sensor unit 38 is adjusted.
  • the two signal conductors 35 present in the exemplary embodiment are assigned to all existing sensor units 38 in terms of their effectiveness, the exemplary embodiment having four sensor units 38 arranged axially in succession. Every sensor unit 38 has two contact elements 53, each of which is in electrical contact with one of the two signal conductors 35.
  • the sensors 48 of the existing sensor units 38 are actuated in succession in the course of a stroke. Since the two sensor connections 54 are each connected to one of the two contact elements 53, a respectively actuated sensor 48 closes a circuit with the evaluation device 12, which results in a sensor signal that can be used to actuate connected devices, for example the associated valve device 5.
  • each sensor unit 38 is equipped with a coding device 55 which, when the assigned sensor is actuated, produces a coding signal which is characteristic of this sensor and by means of which the evaluation device 12 can recognize the actuated sensor 48.
  • the coding devices 55 consist of resistance devices 56, which contain at least one electrical resistance element.
  • the resistance device 56 is preferably connected in series with the associated sensor 48.
  • Each resistance device 56 has a specific electrical resistance, the electrical resistances of the various resistance devices 56 differing from one another.
  • the resistance values are stored in the evaluation device 12.
  • the electrical resistance is infinite since the two signal conductors 35 are not connected. If, on the other hand, one of the sensors 48 is actuated, the associated sensor unit 38 results in an electrical connection between the two signal conductors 35, the electrical resistance of the associated resistance device 56 being effective and being detected by the evaluation device 12. By comparison with The stored resistance values allow the sensor signal to be assigned to the excited sensor 48 without any doubt. The electrical resistance caused when a respective sensor is actuated thus practically forms the coding signal for the evaluation device 12 for identifying the excited sensor 48.
  • the evaluation device 12 Depending on the excited sensor 48, the evaluation device 12 generates certain control signals for subordinate devices, for example for the valve device 5. However, the control signals can first reach the higher-level coordination control via the possibly assigned control electronics 6.
  • the outgoing control signals 57 can be passed on as required in the context of a parallel, but preferably in the context of a serial data bus.

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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)
EP96113214A 1995-11-22 1996-08-17 Appareil de détection de position Expired - Lifetime EP0775835B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29518539U DE29518539U1 (de) 1995-11-22 1995-11-22 Positionserfassungsvorrichtung
DE29518539U 1995-11-22

Publications (3)

Publication Number Publication Date
EP0775835A2 true EP0775835A2 (fr) 1997-05-28
EP0775835A3 EP0775835A3 (fr) 1999-04-28
EP0775835B1 EP0775835B1 (fr) 2001-11-07

Family

ID=8015785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113214A Expired - Lifetime EP0775835B1 (fr) 1995-11-22 1996-08-17 Appareil de détection de position

Country Status (2)

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EP (1) EP0775835B1 (fr)
DE (2) DE29518539U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074815A1 (fr) * 1999-08-04 2001-02-07 FESTO AG & Co Capteur magnétique biaxial de position
EP1199479A3 (fr) * 2000-09-28 2004-01-02 FESTO AG & Co Dispositif hydropneumatique avec un dispositif diagnostique

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29718934U1 (de) * 1997-10-23 1997-12-11 Sick Ag Befestigungsvorrichtung für Sensoren
DE19813371C2 (de) * 1998-03-26 2001-12-20 Festo Ag & Co Kolbenstangenloser Linearantrieb
DE19937597B4 (de) * 1999-08-09 2005-11-24 Abb Patent Gmbh Druckmittelbetriebener Stellantrieb
DE20004976U1 (de) 2000-03-17 2000-05-31 Festo Ag & Co Fluidbetätigter Linearantrieb
DE10044984A1 (de) * 2000-09-11 2002-03-21 Mannesmann Rexroth Ag Hydraulischer Zylinder
DE102004017899A1 (de) * 2004-04-13 2005-11-10 Festo Ag & Co. Positionssensoranordnung mit mehreren in einer Reihe angeordneten, magnetfeldsensitiven Sensoren, insbesondere Hall-Sensoren
DE102004023241B4 (de) * 2004-05-07 2007-11-08 Rexroth Mecman Gmbh Einrichtung zur Positionserfassung
EP1881204B1 (fr) * 2006-07-22 2008-11-12 Festo AG & Co. KG Module de service de cylindre
DE102007008338B4 (de) * 2007-02-20 2009-12-17 Festo Ag & Co. Kg Positionssensoreinrichtung und damit ausgestatteter Aktor
DE102010049760A1 (de) * 2010-10-29 2012-05-03 Festo Ag & Co. Kg Sensoranordnung
DE102010055117A1 (de) * 2010-12-18 2012-06-21 Festo Ag & Co. Kg Positionssensoreinrichtung und damit ausgestattete Linearantriebsvorrichtung
EP3070438B1 (fr) * 2015-03-19 2017-02-01 Sick Ag Boîtier de capteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2268247A1 (fr) * 1974-04-19 1975-11-14 Kuebler Impulsegeraetebau H
US4068163A (en) * 1976-07-02 1978-01-10 Diamond Power Specialty Corporation Reed switch oscillator assembly for a position indicating system
DE3442879A1 (de) * 1984-11-24 1986-05-28 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Einrichtung zum erfassen der relativen position von zwei relativ zueinander bewegbaren teilen
DE4137586A1 (de) * 1991-11-15 1993-05-19 Frank Rueger Vorrichtung zur feststellung einer kolbenstellung in einem zylinder
EP0652378A1 (fr) * 1993-11-05 1995-05-10 MANNESMANN Aktiengesellschaft Dispositif pour détecter les positions des éléments mobiles avec capteurs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2268247A1 (fr) * 1974-04-19 1975-11-14 Kuebler Impulsegeraetebau H
US4068163A (en) * 1976-07-02 1978-01-10 Diamond Power Specialty Corporation Reed switch oscillator assembly for a position indicating system
DE3442879A1 (de) * 1984-11-24 1986-05-28 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Einrichtung zum erfassen der relativen position von zwei relativ zueinander bewegbaren teilen
DE4137586A1 (de) * 1991-11-15 1993-05-19 Frank Rueger Vorrichtung zur feststellung einer kolbenstellung in einem zylinder
EP0652378A1 (fr) * 1993-11-05 1995-05-10 MANNESMANN Aktiengesellschaft Dispositif pour détecter les positions des éléments mobiles avec capteurs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074815A1 (fr) * 1999-08-04 2001-02-07 FESTO AG & Co Capteur magnétique biaxial de position
EP1199479A3 (fr) * 2000-09-28 2004-01-02 FESTO AG & Co Dispositif hydropneumatique avec un dispositif diagnostique

Also Published As

Publication number Publication date
EP0775835A3 (fr) 1999-04-28
EP0775835B1 (fr) 2001-11-07
DE59608134D1 (de) 2001-12-13
DE29518539U1 (de) 1996-01-18

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