EP0297150B1 - Détecteur de position pour la part mobile d'un servomoteur actionné par fluide - Google Patents

Détecteur de position pour la part mobile d'un servomoteur actionné par fluide Download PDF

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Publication number
EP0297150B1
EP0297150B1 EP87109271A EP87109271A EP0297150B1 EP 0297150 B1 EP0297150 B1 EP 0297150B1 EP 87109271 A EP87109271 A EP 87109271A EP 87109271 A EP87109271 A EP 87109271A EP 0297150 B1 EP0297150 B1 EP 0297150B1
Authority
EP
European Patent Office
Prior art keywords
probe
shaft
holder
position detector
set forth
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
EP87109271A
Other languages
German (de)
English (en)
Other versions
EP0297150A1 (fr
Inventor
Wolfgang Dondorf
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.)
Pulsotronic Merten GmbH and Co KG
Original Assignee
Pulsotronic Merten 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 Pulsotronic Merten GmbH and Co KG filed Critical Pulsotronic Merten GmbH and Co KG
Priority to EP87109271A priority Critical patent/EP0297150B1/fr
Priority to DE8787109271T priority patent/DE3764644D1/de
Priority to US07/208,257 priority patent/US4876531A/en
Publication of EP0297150A1 publication Critical patent/EP0297150A1/fr
Application granted granted Critical
Publication of EP0297150B1 publication Critical patent/EP0297150B1/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

Definitions

  • the invention relates to a position detector for the movable part of a fluid-operated actuator according to the preamble of patent claim 1.
  • proximity switches as the limit switches for hydraulic or pneumatic cylinders which contain an electrical component which reacts to the approach of an electrically conductive part.
  • the electrical component consists, for example, of the coil of an oscillating circuit, which is damped when a metal part approaches, so that the oscillation of the oscillating circuit changes or stops oscillating.
  • the oscillating circuit coil is arranged in a cylindrical probe which is let into a bore in a wall of the hydraulic or pneumatic cylinder and is connected to the cylinder space. When the piston approaches the end of the probe in which the electrical component is arranged, the electrical component reacts without contact to the approach of the piston, which indicates that the piston position to be recognized has been reached.
  • a difficulty with the known contactless piston position detectors is that the response distance of the probe is very limited and is only about 2 mm. It is therefore important to place the end of the probe very close to the cylinder space. With different wall thicknesses of the cylinder wall, different probe lengths are required. On the other hand, it is necessary to seal the bore of the cylinder wall against the high hydraulic or pneumatic pressures.
  • the manufacturers of non-contact piston position detectors supply a series of numerous position detectors that only differ in the length of the cylindrical probe. The probe is firmly attached to the holder, which is sealingly attached to the outside of the pressure cylinder, and it projects from the holder so far that its end is arranged as flush as possible with the inner surface of the cylinder wall.
  • the invention has for its object to provide a position detector of the type specified in the preamble of claim 1, which can be used for a large range of wall thicknesses of the pressure-actuated actuator.
  • the probe is adjustable relative to the holder in the axial direction of the probe. This allows the amount of protrusion of the cylindrical probe from the holder to be changed. A portion of the probe extends into the holder, in the channel of which the second sealing device is located, to prevent the fluid pressure from escaping from the actuator through the gap between the channel of the holder and the probe wall.
  • the cylindrical shape of the probe is used to seal inside the holder at different axial positions of the probe. The probe thus protrudes into the interior of the holder in such a way that the extent to which the probe protrudes from the holder can be changed.
  • Such a position detector can be used in cylinders with different cylinder wall thicknesses, it being ensured in each case that the probe end is located at a very short distance from the inner surface of the cylinder wall.
  • the position detector according to the invention can be used not only with pressure-actuated cylinders, but also with rotating hydraulic motors, turbines or the like. and generally for all actuators in which a movable part is moved in a fixed part under the pressure of a fluid.
  • the main area of application is printing cylinders.
  • the position detector is that the respective axial position of the probe can be determined very easily by the movable part of the pressure-actuated actuator can be brought into a position in which it is located on the hole in the wall. The probe can then be advanced into the bore until it hits the moving part and then moved back slightly. In this way, the optimal position of the probe with respect to the wall of the actuator and with respect to the movable part can be found, the probe responding to an approach of the movable part without projecting into the path of movement.
  • the shaft on the holder is preferably infinitely adjustable, although an adjustment in small increments is also possible, for example by means of a latching device.
  • the circuit housing which contains the electrical components of the position detector - with the exception of the electrical component contained in the probe - is expediently attached to the rear end of the shaft and is moved axially together with the probe and the shaft relative to the holder.
  • This circuit housing can be used as a handle part to carry out the axial adjustment of the probe.
  • the circuit housing can be pivoted around the axis of the shaft in order to take the most favorable position for the connection of an external line.
  • rotation limiting means are provided which allow a limited rotation of the circuit housing without the shaft and the probe rotating. If the circuit housing is rotated further, however, the shaft is also rotated, which makes it possible to axially adjust the probe by rotating the circuit housing about the shaft axis.
  • the hydraulic cylinder 10 has a tubular middle piece 11 and two end pieces 12, 13.
  • the cylinder bore extends through the middle piece 11 into the end pieces 12, 13.
  • Tension rods 14 run between the end pieces 12, 13.
  • a position detector 15 is attached to each of the end pieces 12, 13 in order to detect the front and rear end positions of the piston in the cylinder.
  • the position detector 15 has a cylindrical probe 16 which projects out of a block-shaped solid holder 17.
  • a flange 18 of the holder 17 is fastened from the outside to the wall 19 (FIG. 3) of the cylinder 10 with screws 20, the probe 16 projecting from the center of the flange 18 protruding into a bore 21 in the wall 19.
  • the end of the probe 16 should be as close as possible to the inner surface 22 of the wall 19, along which the piston 23 sweeps, but must not protrude beyond the inner surface 22 in order not to obstruct the path of the piston 23.
  • the cylindrical probe 16 projects through a cylindrical channel 24 of the flange 18. Beyond the channel 24, the probe 16 is extended by a hollow shaft 25 with an external thread.
  • the shaft 25 carries the circuit housing 26 at its upper end.
  • a first sealing device 27 in the form of a sealing ring is accommodated in an annular groove 28 which is provided in the surface of the flange 18 abutting the wall 19.
  • the first sealing device 27 is compressed axially.
  • a second sealing device 29 in the form of a sealing ring closely surrounding the probe 16 is provided in the region of the channel 24 in an annular groove in the flange 18.
  • This second sealing device 29 seals the annular gap between the probe 16 and the channel 24.
  • Both sealing devices 27, 29 can also be combined to form a common sealing device. It is only important that on the one hand the gap between the holder 17 and the wall 19 and on the other hand the annular gap between the channel 17 and the probe 16 are sealed, so that no pressure fluid can escape from the cylinder 10 to the outside.
  • a tube piece 31 is provided with longitudinal slots 30, which is an integral part of the holder 17.
  • the channel 24 extends with a constant diameter into the lower region of the pipe section 31.
  • a threaded bore 32 At the upper end of the pipe section 31 there is a threaded bore 32, the diameter of which is smaller than that of the channel 24 and the thread of which engages with the external thread of the shaft 25.
  • the threaded bore 32 forms an engagement device which cooperates with the shaft 25 to adjust the shaft position.
  • the slots 30 of the pipe section 31 run freely towards the upper end of the pipe section 31, i.e. they also divide the threaded bore 32.
  • Each of these slots 30 is traversed by a screw 33 which can be tightened to pull the edges of the slot 30 against one another and to reduce the diameter of the threaded bore 32.
  • the screws 33, in conjunction with the slots 30, form a clamping device for clamping the shaft in the set position.
  • the internal structure of the probe 16 and the attachment of the circuit housing 26 can be seen in FIG. 5.
  • a support body 35 made of ceramic or plastic is attached to the end of the tube 34 and carries at its end the electrical component 36 which reacts to the approach of a metal part.
  • This component 36 is an annular coil which is housed in a ferromagnetic core which is open on one side is brought.
  • the outer diameter of the carrier body 35 and the electrical component 36 are equal to the outer diameter of the tube 34.
  • the tube 34, the carrier body 35 and the electrical component are closely surrounded by the cylindrical probe jacket 37.
  • the bottom wall 38 of the probe jacket 37 forms the outer end of the probe 16.
  • the electrical component 36 lies directly against the inside of the bottom wall 38. Lines 39 lead from the electrical component 36 through the tube 34 and the shaft 25 into the interior of the circuit housing 26.
  • the probe jacket 37 consists of an oil-resistant plastic, preferably polyacetal.
  • the sleeve jacket 37 is supported directly on the tube 34.
  • the interior of the shaft 25 and the tube 34 is filled with a plastic sealing compound (not shown) in order to also support these parts against external pressure.
  • a hole 40 through which the casting compound also reaches the area between the tube wall and the probe jacket 37 in order to also enclose the electrical component 36 and the carrier body 35 without any cavities.
  • the circuit housing 26 is fastened to the upper end of the shaft 25 in such a way that it can be rotated within limits around the shaft axis without the shaft 25 being carried along.
  • the circuit housing 26 is in threaded engagement with the shaft 25.
  • the end of the shaft 25 projecting into the interior of the housing is provided with a recess 41 which extends over approximately 180 ° of the shaft circumference.
  • a pin 42 protrudes into the recess 41 and is slidably attached to a block 43 fastened in the circuit housing. Together with the recess 41, the pin 42 forms a rotation limiting means in order to be able to rotate the shaft 25 to its axial adjustment by rotating the housing 26.
  • the rotation limiting means allows the circuit housing 26 to rotate freely by approximately 180 ° without rotating the shaft 25 and the probe 16. As a result, the circuit housing 26 can be freely adjusted to the desired direction.
  • circuit housing 26 At one end of the circuit housing 26 there is a union plug connection 44 with a threaded ring which surrounds contact pins 45 for the connection of external lines.
  • the circuit housing 26 contains the remaining components of the proximity switch to which the electrical component 36 belongs.
  • the length of the probe 16 protruding from the holder 17 can be changed by rotating the shaft 25, the shaft 25 rotating in the threaded bore 32 and being axially displaced with respect to the holder 17 together with the probe 16. Such a displacement is possible via a path which corresponds to approximately 3/4 the length of the probe 16. It is therefore possible to adjust the protrusion of the probe 16 over the contact surface of the holder 17 on the wall 19 over a large length range. If the thickness of the wall 19 varies, the protruding length of the probe 16 can be adapted to the respective wall thickness. When the correct length adjustment of the probe is found, the screws 33 are tightened so that the probe position in relation to the holder 17 can no longer be changed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)

Claims (9)

1. Détecteur de position (15) pour la partie mobile (23) d'un servomoteur (10) actionné par fluide, avec un support (17) à fixer à une paroi (19) du servomoteur (10) de telle sorte qu'il entoure un alésage (21) dans la paroi (19), une sonde cylindrique (16) insérable dans l'alésage (21), s'écartant du support (17), contenant au moins un élément électrique (36) réagissant à l'approche de pièces conductrices, et un premier dispositif d'étanchéité (27) prévu au support (17) pour rendre étanche la surface d'appui entre le support (17) et la paroi (19), caractérisé en ce que la sonde (16) se prolonge par une tige creuse (25) pouvant se déplacer axialement par rapport au support (17) pour modifier la longueur de l'écartement entre la sonde (16) et le support (17), que la sonde (16) est guidée, de manière mobile, dans un canal (24) du support (17) et qu'un second dispositif d'étanchéité (29) est prévu dans le canal (24) pour rendre étanche le passage de la sonde (16).
2. Détecteur de position selon la revendication 1, caractérisé en ce que la tige (25) peut être déplacée en continu sur le support (17).
3. Détecteur de position selon les revendications 1 ou 2, caractérisé en ce que le support (17) présente, du côté du canal éloigné de la paroi (19), un dispositif d'engrenage (32) coopérant avec la tige (25) pour déplacer la position de la tige.
4. Détecteur de position selon la revendication 3, caractérisé en ce que le dispositif d'engrenage (32) est un pas de vis s'engrenant dans le pas de vis de la tige (25).
5. Détecteur de position selon la revendication 4, caractérisé en ce que le dispositif d'engrenage (32) est construit comme dispositif de serrage (30, 33) pour le serrage de la tige (25) dans la position réglée.
6. Détecteur de position selon l'une des revendications 1 à 4, caractérisé en ce que, à l'extrémité de la tige (25) éloignée de la sonde (16), est fixé un boîtier de commutation (26) dans lequel pénètrent des conduites (39) reliées à l'élément électrique (36).
7. Détecteur de position selon la revendication 6, caractérisé en ce que le boîtier de commutation (26) peut tourner par rapport à la tige (25) et qu'il est prévu des moyens de limitation de rotation (41, 42) afin que la tige (25) puisse être entraînée en rota- fion pour son déplacement axial, par rotation du boîtier de commutation (26).
8. Détecteur de position selon l'une des revendications 1 à 7, caractérisé en ce que la sonde (16) présente une enveloppe de sonde (37) cylindrique remplie d'un mélange de moulage pour le protéger contre la pression extérieure.
9. Détecteur de position selon l'une des revendications 1 à 8, caractérisé en ce que la sonde (16) présente un tube (34) solidaire de la tige (25) portant et protégeant contre la pression extérieure une enveloppe de sonde (37) tubulaire et que, à l'extrémité du tube (34) est fixé l'élément électrique (36) re- couvert d'une paroi inférieure (38) de l'enveloppe de sonde (37).
EP87109271A 1987-06-27 1987-06-27 Détecteur de position pour la part mobile d'un servomoteur actionné par fluide Expired - Lifetime EP0297150B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP87109271A EP0297150B1 (fr) 1987-06-27 1987-06-27 Détecteur de position pour la part mobile d'un servomoteur actionné par fluide
DE8787109271T DE3764644D1 (de) 1987-06-27 1987-06-27 Positionsdetektor fuer das bewegbare teil eines mit fluid betaetigten stellgliedes.
US07/208,257 US4876531A (en) 1987-06-27 1988-06-17 Position detector for the movable element of a fluid-operated actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87109271A EP0297150B1 (fr) 1987-06-27 1987-06-27 Détecteur de position pour la part mobile d'un servomoteur actionné par fluide

Publications (2)

Publication Number Publication Date
EP0297150A1 EP0297150A1 (fr) 1989-01-04
EP0297150B1 true EP0297150B1 (fr) 1990-08-29

Family

ID=8197096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109271A Expired - Lifetime EP0297150B1 (fr) 1987-06-27 1987-06-27 Détecteur de position pour la part mobile d'un servomoteur actionné par fluide

Country Status (3)

Country Link
US (1) US4876531A (fr)
EP (1) EP0297150B1 (fr)
DE (1) DE3764644D1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645268B1 (fr) * 1989-04-03 1991-07-12 Toupin Joseph Dispositif de detection de franchissement d'un seuil de temperature
US5219068A (en) * 1991-07-16 1993-06-15 Cincinnati Milacron, Inc. Adjustable proximity switch mounting assembly
DE4338568C2 (de) * 1993-11-05 1997-05-22 Mannesmann Ag Einrichtung zur Abfrage von Stellungen an bewegten Elementen mittels Sensoren
US5488860A (en) * 1993-12-29 1996-02-06 E-Systems, Inc. Apparatus for determining the position of a piston in a fluidic actuator
US5704813A (en) * 1995-12-13 1998-01-06 Namco Controls Corporation Proximity sensor housing and arrangement
US5906222A (en) * 1996-08-07 1999-05-25 General Electric Company Apparatus for detecting position of piston in hydraulic actuator coupled to gate valve
CH691003A5 (fr) * 1996-08-13 2001-03-30 Parker Lucifer Sa Tête de commande électro-pneumatique pour actuateurs.
US5947001A (en) * 1997-04-24 1999-09-07 Turn-Act, Inc. Molded piston
DE19916986C2 (de) * 1999-04-15 2001-12-06 Sauer Danfoss Nordborg As Nord Steuereinrichtung für die Lage eines Ventilschiebers
ITBG20050028A1 (it) * 2005-05-13 2006-11-14 Abb Service Srl Dispositivo per la rilevazione della posizione di un elemento mobile ad esso accoppiato e relativo elemento mobile.

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2182363A5 (fr) * 1972-04-28 1973-12-07 Cem Comp Electro Mec
FR2342419A1 (fr) * 1976-02-24 1977-09-23 Climax France Sa Dispositif detecteur electronique sans contact ni piece mobile de position ou passage sur ensemble verin actionne par fluide
DE7927808U1 (de) * 1979-09-29 1980-02-21 Werner Turck Gmbh & Co Kg, 5884 Halver Schutzvorrichtung fuer einen naeherungsschalter gegen aeussere stoereinfluesse
DE3117386C1 (de) * 1981-05-02 1982-10-28 Gebhard Balluff, Fabrik Feinmechanischer Erzeugnisse, 7303 Neuhausen Näherungsschalter
DE3339093A1 (de) * 1983-10-28 1985-05-09 Festo KG, 7300 Esslingen Annaeherungsfuehler
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator
US4689553A (en) * 1985-04-12 1987-08-25 Jodon Engineering Associates, Inc. Method and system for monitoring position of a fluid actuator employing microwave resonant cavity principles
DE3609537A1 (de) * 1985-06-29 1987-01-08 Wabco Westinghouse Steuerung Beruehrungslos arbeitende naeherungsschalteinrichtung
US4705151A (en) * 1985-10-31 1987-11-10 Automotive Product Plc Hydraulic slave cylinder interlock switching device with proximity sensor
DE8626017U1 (de) * 1986-09-30 1986-11-20 Werner Turck GmbH & Co. KG, 58553 Halver Näherungsschalter mit einem in einen Druckzylinder einbaubaren Sensorteil zur Erfassung der Kolbenstellung
US4752657A (en) * 1987-05-07 1988-06-21 Allied Automation Systems, Inc. Proximity switch mounting apparatus

Also Published As

Publication number Publication date
US4876531A (en) 1989-10-24
EP0297150A1 (fr) 1989-01-04
DE3764644D1 (de) 1990-10-04

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