EP0535085B1 - Dispositif de fixation pour detecteur de position de piston avec dispositif de serrage - Google Patents

Dispositif de fixation pour detecteur de position de piston avec dispositif de serrage Download PDF

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Publication number
EP0535085B1
EP0535085B1 EP91911689A EP91911689A EP0535085B1 EP 0535085 B1 EP0535085 B1 EP 0535085B1 EP 91911689 A EP91911689 A EP 91911689A EP 91911689 A EP91911689 A EP 91911689A EP 0535085 B1 EP0535085 B1 EP 0535085B1
Authority
EP
European Patent Office
Prior art keywords
yoke
holding
holding device
holding element
pin
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
EP91911689A
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German (de)
English (en)
Other versions
EP0535085A1 (fr
Inventor
Anders Liljenberg
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.)
Rexroth Mecman AB
Original Assignee
Rexroth Mecman 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 Rexroth Mecman AB filed Critical Rexroth Mecman AB
Publication of EP0535085A1 publication Critical patent/EP0535085A1/fr
Application granted granted Critical
Publication of EP0535085B1 publication Critical patent/EP0535085B1/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 invention concerns a holding device for a piston position sensor, being displaceably mounted on the outside of a fluid pressure cylinder, particularly for the sensing of a magnetic field generated by at least one permanent magnet being attached to the piston of the fluid pressure cylinder, which holding device comprises an essentially U-shaped yoke, being displaceable along and fastenable to the outside of the cylinder tube by means of fastening elements.
  • U-shaped yoke consists of two clamping jaws enclosing the cylinder tube, which is circular-cylindric and not equipped with any external tension rods, guides or the like. The clamping jaws are thus tightened directly against the smooth cylinder tube.
  • piston position sensors available on the market being provided with a clamping device for the clamping to a tension rod, which extends along the outside of the cylinder tube.
  • a clamping device for the clamping to a tension rod, which extends along the outside of the cylinder tube.
  • cylinder tube profiles are used being extruded integrally with longitudinal beads having internal channels, which may either contain tension rods or be provided with internal threads at the ends, so that cylinder end plates may be fastened to the ends of the cylinder tube by means of fastening screws engaging these threads.
  • the aim of the invention is to achieve a holding device which may be used with the latter type of fluid pressure cylinder without external tension rods, yet facilitating safe mounting of the above mentioned type of piston position sensor with a clamping device, being available on the market.
  • a holding device having the features stated in claim 1, the holding device thus being characterized in that the essentially U-shaped yoke is displaceable along and fastenable to at least one guide being formed on the outside of and integrally with the cylinder tube, that a holding element is partly inserted into and fastenable within the yoke, said holding element being provided with a protruding holding pin, and that the piston position sensor is provided with a clamping device, by means of which the piston position sensor is clampable onto said protruding holding pin.
  • piston position sensors of the previously known type.
  • the piston position sensor may easily be detached from the holding pin without detaching the yoke from its fastened position on the guides. This means that the piston position sensor may be dismounted and remounted without altering the adjusted position of the yoke.
  • Fig. 1 and 2 thus illustrate a cylinder tube 1 of a fluid pressure cylinder, the cylinder end plates at the ends of the cylinder tube and a displaceable piston with associated piston rod inside of the cylinder tube not being shown.
  • the cylinder tube 1 which is preferably manufactured from an aluminium alloy, has on the one hand, longitudinal beads 2 with through holes 3 therein for fastening screws (not shown) for the end plates and, on the other hand, dovetail shaped longitudinal beads 4 on opposite sides of the cylinder tube 1, with undercut, mutually parallel guide grooves 4a, 4b, formed at their longitudinal edges, for a holding device 5, according to the invention, being displaceable along the cylinder tube.
  • This holding device 5 for a piston postion sensor comprises a U-shaped yoke 6, the shanks 7 and 8 of which at their ends are formed with inwardly projecting gripping edges 7a, 8a, engaging the guide grooves 4a and 4b, respectively.
  • the yoke 6 may be made of metal but is preferably produced out of a rigid plastic material, rendering the yoke a certain dimensional flexibility as well as good sliding properties relative to the guide grooves 4a, 4b.
  • the dimensional flexibility is further increased by longitudinal weakenings 6a, 6b in the web portion 6c of the yoke adjacent to the respective shank.
  • the shanks 7, 8 are provided with bevels or recesses 7b, 8b (Fig.
  • the yoke 6 is thus displaceable along the whole length of the cylinder tube 1 (for the positioning close to the second end plate, the yoke may be snapped out of the guide grooves 4a, 4b and turned 180°, so that the bevelled corner portions 7b, 8b, abut said second end plate) and may be positioned and fixed in a desired position by means of a transverse fastening screw 9, which, when tightened, presses the shanks 7, 8 of the yoke towards each other in the area of the fastening screw 9, i.e.
  • the threaded end portion of the fastening screw 9 (not visible in the figures) is in threaded engagement with a nut, which is non-rotatably guided in a recess in the opposite shank 8.
  • a holding body or element 10 with a protruding pin 10b, onto which a piston position sensor 12 (Fig. 3) is fastenable comprises an essentially cylindrical portion 10a (Fig. 2) which is dimensioned to be inserted between the shanks 7, 8 of the yoke with a certain play.
  • a second transverse fastening screw 13 may be inserted through a hole in the shank 7 and through a circumferential groove 14 in the cylindrical portion 10a of the holding element to an opposing hole in the shank 8, where a nut (not shown) engaging the thread of the fastening screw 13 is non-rotatably arranged in a recess (not shown) in the shank 8.
  • the holding element 10 is locked axially inside the yoke 6 while being rotatable around the axis of the cylindrical portion 10a, the circumferential groove 14 making such a rotation possible.
  • This rotatability is utilized for the adjustment of the axially protruding holding pin 10b to a desired radial distance from the outside of the cylinder tube 1.
  • the holding pin 10b is namely excentrically placed relative to the axis of the cylindrical portion 10a, as best illustrated in Figs. 1 and 3.
  • the fastenable piston position sensor 12 may be adjusted in such a way that its sensor element is placed close to the outer surface of the cylinder tube, irrespective of the diameter of the particular cylinder tube.
  • the adjusting operation is facilitated by the free end surface of the holding pin 10b being provided with an internal hexagonal recess 11, so that the whole holding element may be rotated to a desired rotational position by means of a hexagon screw driver.
  • the recess 11 may of course be replaced by a slot for an ordinary screw driver.
  • the holding element 10 may be locked in the adjusted rotational position by means of a locking screw 15, which is screwed through a threaded through hole in the web portion 6c of the yoke 6c.
  • the piston position sensor 12 itself is of a known type, including a sensor element 12a, from which an electric cable 16 with power supply and signal conduits emerges, a fastening screw 12b and a clamping jaw 12c actuated thereby.
  • the piston position sensor 12 is fastenable on the holding pin 10b.
  • the holding pin 10b may be provided with a scale or markings, so that the piston position sensor 12 may be dismounted and remounted in exactly the same position on the holding pin.
  • the U-shaped yoke 6' is turned with its shanks 7', 8' away from the cylinder tube 1', the web portion 6'c of the yoke 6' lying on a longitudinal bead 16' with an inner, undercut, essentially T-shaped guide groove 4' formed on the outside of the cylinder tube 1'.
  • a displaceable nut 17' is seated within this groove and is in threaded engagement with a screw 18', the head 18'a of which is countersunk in an inner recess in the web portion 6'c of the yoke 6'.
  • the yoke 6' is thus displaceable along the bead 17' and the groove 4' as well as fastenable in a desired position by means of the screw 18'.
  • the holding element 10' with its excentrically arranged longitudinally protruding holding pin 10'b, is in this case directly fastenable between the shanks 7', 8' of the yoke 6' by means of the two fastening screws 9', 13', of which (as in the previous embodiment) one, namely the fastening screw 9', serves as an axial abutment when inserting the cylindrical portion 10'a of the holding element 10' between the shanks 7', 8' and the other, namely the fastening screw 13', locks this portion 10'a axially in the inserted position through cooperation with a circumferential groove 14'.
  • the holding element 10' may be fixed by tightening the two fastening screws 9', 13'.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Clamps And Clips (AREA)
  • Actuator (AREA)

Abstract

Dispositif de fixation pour un détecteur de position de piston (12), monté de manière à pouvoir être déplacé sur la surface externe d'un cylindre de pression de fluide. Le dispositif de fixation (5) comprend d'une part un collier en U (6) pouvant être déplacé le long d'au moins un élément de guidage solidaire au tube de cylindre (19), et, d'autre part, un élément de fixation (10) pouvant être bloqué à l'intérieur du collier (6) et pourvu d'une cheville de fixation (10b) faisant saillie, sur laquelle le détecteur de position de piston (12) peut se fixer.

Claims (12)

  1. Dispositif de fixation pour détecteur de position de piston (12, 12') étant monté de manière à pouvoir être déplacé sur l'extérieur d'un cylindre à pression de fluide, lequel dispositif de fixation (5; 5') comprend un joug (6; 6') sensiblement en forme de U, pouvant être déplacé et fixé sur l'extérieur du tube de cylindre (1; 1') au moyen d'éléments de fixation (9, 13; 18', 17'), caractérisé en ce que :
    - le joug (6; 6') sensiblement en forme de U peut être déplacé et fixé sur au moins un guide (4; 4') étant formé sur l'extérieur du tube de cylindre (1; 1') et d'une seule pièce avec celui-ci;
    - un élément de fixation (10; 10') est en partie inséré dans le joug (6; 6') et peut être attaché au sein de celui-ci, ledit élément de fixation étant doté d'une tige de fixation (10b; 10'b) en projection; et
    - le détecteur de position de piston (12) est doté d'un dispositif de serrage (12b, 12c), au moyen duquel le détecteur de position de piston peut être serré sur ladite tige de fixation (10b; 10'b) en projection.
  2. Dispositif de fixation selon la revendication 1, caractérisé en ce que la tige de fixation (10b; 10'b) est en projection parallèlement audit au moins un guide (4; 4').
  3. Dispositif de fixation selon la revendication 1 ou 2, caractérisé en ce que l'élément de fixation (10; 10') est mobile au sein du joug en forme de U pour réglage de la distance radiale entre la tige de fixation (10b; 10'b) et la surface externe du tube de cylindre (10, 10').
  4. Dispositif de fixation selon la revendication 3, caractérisé en ce que l'élément de fixation (10; 10') peut être tourné au sein du joug en forme de U (6; 6') et en ce que la tige de fixation (10b; 10'b) est excentrée relativement au centre de rotation.
  5. Dispositif de fixation selon la revendication 4, caractérisé en ce que la surface d'extrémité libre de la tige de fixation (10b; 10'b) est dotée d'un évidement (11; 11'), par exemple d'une fente pour un tournevis ou d'un évidement interne pour un tournevis hexagonal, afin de faciliter le réglage par rotation de la tige (10b) au moyen d'un outil.
  6. Dispositif de fixation selon la revendication 4 ou 5, caractérisé en ce que la portion (10a; 10'a) de l'élément de fixation (10; 10') qui peut être insérée dans le joug (6; 6') est sensiblement cylindrique et dotée d'une gorge circonférentielle (14; 14'), qui coopère avec une vis (13; 13') s'étendant entre les jambages (7, 8; 7', 8') du joug (6; 6') pour le blocage axial de l'élément de fixation (10; 10') dans une position d'insertion au sein du joug (6; 6').
  7. Dispositif de fixation selon l'une quelconque des revendications 4 à 6, caractérisé en ce qu'au moins une vis de fixation (15) peut être vissée dans le joug (6) pour le blocage par rotation de l'élément de fixation (10) dans une position de rotation ajustée.
  8. Dispositif de fixation selon l'une quelconque des revendications précédentes, caractérisé en ce que les extrémités (7a, 7b) des jambages du joug (6) sont guidées le long de deux guides (4a, 4b) parallèles et en ce que lesdits éléments de fixation (9, 13) agissent entre les jambages (7, 8) du joug.
  9. Dispositif de fixation selon la revendication 8, caractérisé en ce que lesdits deux guides sont constitués par des gorges de queue d'aronde (4a, 4b) formées sur l'extérieur du tube de cylindre (1), les extrémités des jambages du joug (6) étant dotées de bords de préhension (7a, 8a) s'engageant avec les gorges de queue d'aronde, en ce que la portion pouvant être insérée (10a) de l'élément de fixation (10) peut être insérée entre les jambages (7, 8) du joug avec un jeu, de manière que les jambages puissent être pressés l'un vers l'autre au moyen desdits éléments de fixation (9, 13) pour obtenir un engagement par frottement entre les bords de préhension (7a, 8a) et les gorges de queue d'aronde (4a, 4b), et en ce que l'élément de fixation (10) peut être bloqué au sein du joug au moyen d'au moins un élément de blocage distinct (15).
  10. Dispositif de fixation selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit guide est constitué par une gorge de guidage évidée (4'), dans laquelle une portion (17') reliée à la portion de dos (6'c) du joug (6') est calée tout en pouvant être déplacée.
  11. Dispositif de fixation selon la revendication 10, caractérisé en ce que ladite portion calée tout en pouvant être déplacée est constituée par un écrou (17') étant engagé par vissage avec une vis (18'), qui traverse la portion de dos (6'c) du joug (6') et constitue ledit élément de fixation.
  12. Dispositif de fixation selon la revendication 10 ou 11 conjointement à l'une quelconque des revendications 4 à 6, caractérisé en ce que l'élément de fixation (10') peut être bloqué dans une position de rotation souhaitée par action de serrage entre les jambages (7', 8') du joug (6').
EP91911689A 1990-06-20 1991-05-29 Dispositif de fixation pour detecteur de position de piston avec dispositif de serrage Expired - Lifetime EP0535085B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9002201A SE9002201L (sv) 1990-06-20 1990-06-20 Haallaranordning foer kolvlaegesavkaennare med klaemanordning
SE9002201 1990-06-20
PCT/SE1991/000377 WO1991019907A1 (fr) 1990-06-20 1991-05-29 Dispositif de fixation pour detecteur de position de piston avec dispositif de serrage

Publications (2)

Publication Number Publication Date
EP0535085A1 EP0535085A1 (fr) 1993-04-07
EP0535085B1 true EP0535085B1 (fr) 1995-08-02

Family

ID=20379826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91911689A Expired - Lifetime EP0535085B1 (fr) 1990-06-20 1991-05-29 Dispositif de fixation pour detecteur de position de piston avec dispositif de serrage

Country Status (4)

Country Link
EP (1) EP0535085B1 (fr)
DE (1) DE69111812T2 (fr)
SE (1) SE9002201L (fr)
WO (1) WO1991019907A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2811724B1 (fr) * 2000-07-17 2002-09-20 Asco Joucomatic Dispositif de montage d'un detecteur de positionnement d'un piston de verin sur le corps de ce dernier
US6459382B1 (en) 2001-04-26 2002-10-01 Applied Materials, Inc. Over clamp sensor
DE10303889B3 (de) * 2003-01-30 2004-04-08 Bar Pneumatische Steuerungssysteme Gmbh Diagnoseverfahren und -vorrichtung für einen pneumatischen Stellantrieb
CN114952097B (zh) * 2022-06-01 2023-12-29 英莱科技(苏州)有限公司 一种焊缝跟踪传感器及其固定组件

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502286A1 (de) * 1985-01-24 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung

Also Published As

Publication number Publication date
SE9002201D0 (sv) 1990-06-20
DE69111812D1 (de) 1995-09-07
EP0535085A1 (fr) 1993-04-07
SE465684B (sv) 1991-10-14
WO1991019907A1 (fr) 1991-12-26
DE69111812T2 (de) 1995-11-30
SE9002201L (sv) 1991-10-14

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