EP0207270B1 - Dispositif de commutation fonctionnant sans contact par détecteur de proximité - Google Patents

Dispositif de commutation fonctionnant sans contact par détecteur de proximité Download PDF

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Publication number
EP0207270B1
EP0207270B1 EP86106629A EP86106629A EP0207270B1 EP 0207270 B1 EP0207270 B1 EP 0207270B1 EP 86106629 A EP86106629 A EP 86106629A EP 86106629 A EP86106629 A EP 86106629A EP 0207270 B1 EP0207270 B1 EP 0207270B1
Authority
EP
European Patent Office
Prior art keywords
switch
cylinder
switching device
magnetic
pole
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
EP86106629A
Other languages
German (de)
English (en)
Other versions
EP0207270A3 (en
EP0207270A2 (fr
Inventor
Walter Dipl.-Ing. Brausfeld
Helmut Göttling
Rudolf Ing. grad. Möller
Peter Müller
Gerhard Ing. Grad. Scharnowski
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
Mannesmann Rexroth Pneumatik 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
Application filed by Mannesmann Rexroth Pneumatik GmbH filed Critical Mannesmann Rexroth Pneumatik GmbH
Priority to AT86106629T priority Critical patent/ATE84910T1/de
Publication of EP0207270A2 publication Critical patent/EP0207270A2/fr
Publication of EP0207270A3 publication Critical patent/EP0207270A3/de
Application granted granted Critical
Publication of EP0207270B1 publication Critical patent/EP0207270B1/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/008—Change of magnetic field wherein the magnet and switch are fixed, e.g. by shielding or relative movements of armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/0207—Adjustable mounting of casings

Definitions

  • the invention relates to a magnetic switching device according to the preamble of patent claim 1.
  • a proximity switching device which consists of a reed contact element, the switching elements designed as contact tongues can be brought into contact with one another by means of the magnetic field of a permanent magnet which can be moved relative thereto.
  • This known proximity switch device is arranged on the jacket of a working cylinder.
  • a permanent magnet attached to the piston of the working cylinder is used to actuate the reed contact element. If the piston provided with the permanent magnet approaches the reed contact element, the switching elements of the reed contact element reach the area of the magnetic field of the permanent magnet and are brought into contact with one another by the magnetic force.
  • the invention is based on Abe to create a contactless magnetic switching device of the type mentioned, which is simple in construction and does not require any significant changes to the device to be sensed device.
  • the magnetic switching device offers the advantage in particular that it can be used in all devices in which the reaching of a predetermined position of a movably arranged component is to be recognized or used as a switching criterion, without having to make changes to the components of the devices.
  • This advantage has an effect in particular in the case of commercially available working cylinders which are to be subsequently provided with a device for switching valves which control the pressure medium acting on the working cylinder as a function of the piston position.
  • the piston or the piston rod no longer has to be provided with a permanent magnet, no changes need to be made to the components located in the cylinder.
  • the strength of the magnetic field can be quickly and easily adapted to the respective requirements by exchanging the permanent magnet or by arranging a plurality of permanent magnets.
  • the magnetic switching device can be attached to each cylinder, regardless of its diameter, without having to use different holding devices. This ensures that the permanent magnet or the permanent magnets of the magnetic switching device are always the same ones required for proper functioning Predeterminable position and the same distance from the outer surface of the working cylinder.
  • the holding device By designing the holding device as releasable on a part of the cylinder, for. B.
  • both the part of the lever forming a hinge point with a bearing bolt arranged on the cylinder and the part of the lever forming a hinge point with a pin arranged on the housing of the magnetic switching device are of mouth-shaped design, so that the switch can be easily and quickly mounted on the cylinder is.
  • FIG. 1 shows a cylinder (1) with a cylinder cover (2), the cylinder cover (2) being connected via four tie rods (16) to a cylinder base (not shown here).
  • tie rod (16) there is a housing (3), open to the cylinder (1), of a contactlessly operating magnetic switching device, which contains a magnetic field-dependent switch (11) for sensing the relative approach or distance of a body to or from the switch , fixed by means of a clamping screw (15).
  • the housing (3) is arranged in relation to the cylinder (1) such that it sits on the cylinder (1) with its walls delimiting the housing interior (8).
  • the magnetic switching device is provided by the switch (11) arranged in the housing interior (8) as a reed contact element, which has two contact tongues serving as switching elements (9) and (12), and one which is also stationary in the housing interior (8) with respect to the switch (11) ) arranged permanent magnets (14) formed.
  • the permanent magnet (14) is used to generate a magnetic field that actuates the switch (11).
  • One switching element (9) is connected to the cylinder (1) via a connecting wire (5), preferably in such a way that the connecting wire (5) is clamped between the cylinder (1) and a wall of the housing (3). From the connecting wire (5) branches off another connecting wire (4), which leads to a connection (6) designed as a knife contact for z. B. leads a connector.
  • the other switching element (12) is connected via a connecting wire (13) to a pole, in this exemplary embodiment to the pole "N" of the permanent magnet (14). From the same pole of the permanent magnet (14) leads a connecting wire (17) to a further connection (10) designed as a knife contact.
  • the two connections (6) and (10) are arranged on the housing (3) and connected with a plug (7).
  • Fig. 2 shows a working cylinder with two magnetic switching devices.
  • the components that are the same as the components shown in FIG. 1 are provided with the same reference symbols.
  • a piston is arranged in a sealed, displaceable manner.
  • the piston consists of a double-pot sleeve (22) and a disc-shaped body (23) serving as a carrier for the double-pot sleeve (22) made of a ferromagnetic material, e.g. B. a soft iron disc.
  • the piston (22, 23) is connected to a piston rod (24) by means of a screw (21).
  • Two magnetic field-dependent switches (11, 19) and magnetic switching devices (3, 11) and (17, 19) containing permanent magnets, not shown here, are arranged on the cylinder (1) as reed contact elements.
  • Each of the two magnetic switching devices (3, 11) and (17, 19) is provided with a connection (7) and (18).
  • the connections (7, 18) are connected to magnetic valve devices (not shown here) for controlling the pressurization of the pressure medium for the pressure medium chambers (25) and (26) of the working cylinder (1).
  • the switches (11, 17) are connected in a circuit which connects a voltage source to the solenoid valve devices.
  • the magnetic valve device switches over in such a way that the pressure medium supply to the pressure medium chamber (25) is interrupted, the pressure medium chamber is vented and the pressure rod chamber (26) on the piston rod side is aerated.
  • the piston (22, 23) is moved to the right by the pressure building up in the pressure medium chamber (26) on the piston rod side.
  • the magnetic flux in the switch (11) becomes weaker again and the switching elements (9, 12) move away from each other.
  • the circuit in which the switch (11) and the solenoid valve device are located is now interrupted.
  • the solenoid valve device switches over again in such a way that the pressure medium supply to the pressure rod chamber (26) on the piston rod side is interrupted, the pressure medium chamber (26) on the piston rod side is vented and the pressure medium chamber (25) opposite the piston rod side pressure medium chamber (26) is vented.
  • FIG. 3 shows a magnetic switching device which is fastened to a tie rod of a working cylinder by means of a lever serving as a holding device.
  • a lever serving as a holding device.
  • a magnetic switching device which is enclosed by a housing, which is composed of the upper housing part (7) and lower housing part (3), is arranged on a cylinder (1).
  • the lower housing part (3) On its side facing the cylinder (1), the lower housing part (3) has two nose-like projections (29, 28) arranged parallel to one another, with which the housing (3, 7) rests on the cylinder (1).
  • the lower housing part (3) has a pivot pin (30), which extends parallel to the longitudinal axis of the cylinder (1) and extends outwards on two opposite sides.
  • a lever serving as a holding device for the magnetic switching device has at its end facing the housing (3, 7) a bearing eye (32) which serves to receive the free end region of the bearing journal (30).
  • the bearing journal (30) and the bearing eye (32) serve as a joint, which makes it possible to rotate the magnetic switching device about its longitudinal axis running parallel to the longitudinal axis of the cylinder (1).
  • the end region (34) of the lever (33, 34) facing away from the housing (3, 7) of the magnetic switching device has a recess (35) formed in this embodiment, which partially surrounds a bearing pin formed by a tie rod (16) of the working cylinder.
  • the tie rod (16) and three further tie rods, not shown here, serve as a connection between a cylinder cover (31) and a cylinder bottom, not shown here, which limit the cylinder (1) on its end faces.
  • a screw (36) serving as a clamping device is screwed in, which comes into contact with the tie rod (16) and thus the tie rod (16) and the Lever (34,33) braced against each other.
  • the magnetic switching device is installed in such a way that first the lever (34, 33) with its end (33) provided with the bearing eye (32) is pushed onto the pivot pin (30) of the lower housing part (3) of the magnetic switching device and then with the magnetic switching device articulated lever (34, 33) with its mouth-like recess (35) is suspended in the tie rod (16).
  • the housing (7, 3) of the magnetic switching device is then aligned with the cylinder (1) so that it rests on the cylinder (1) with its nose-like projections (28, 29).
  • the lever (34 , 33) and the tie rod (16) are connected to one another in a rotationally fixed manner. If a different position is desired for the magnetic switching device, the screw (36) is loosened and the lever (34, 33) connected to the magnetic switching device is moved on the tie rod (16) in the direction of the longitudinal axis of the cylinder (1).
  • the lever (34, 33) serving as a holding device for the magnetic switching device is articulated by means of a first joint (30, 32) with the magnetic switching device and by means of a second joint, which in this exemplary embodiment is separated from the tie rod (16) and the mouth-like recess (35 ) of the part (34) of the lever (33, 34) is formed, articulated with the cylinder (1) or with a part arranged on the cylinder, such as. B. the tie rod (16), articulated, the magnetic switching device can be attached to each working cylinder without changes to the magnetic switching device or to the holding device. Regardless of the diameter of the respective cylinder, the magnetic switching device takes always the same position required for their function to the cylinder and to the piston provided with the ferromagnetic part.
  • the part (33) of the lever (33, 34) which is articulated to the housing (3, 7) of the magnetic switching device can also have a mouth-like recess instead of the bearing eye (32) in order to simplify assembly.
  • FIG. 4 shows a top view of the holding device for the magnetic switching device shown in FIG. 3.
  • 4 consists of a lever (38, 39) provided with a slot (42) running transversely to the longitudinal axis of a tie rod (16).
  • the two parallel arms (38, 39) of the lever (38, 39) formed by the slot (42) are narrower in the area of the magnetic switching device than in the area of the part of the lever (38, 39) surrounding the tie rod (16) and thus form a fork-like part, on the free end region of which recesses are provided for receiving bearing journals arranged on the housing (7, 3) of the magnetic switching device.
  • the joint formed in this way between the housing (7, 3) of the magnetic switching device and the holding device (38, 39) enables the magnetic switching device to be rotated relative to the holding device (38, 39) about an axis of the housing (7, 3) running parallel to the longitudinal axis of the cylinder ).
  • the end area (40) of the two-armed lever (38, 39) facing away from the housing (7, 3) of the magnetic switching device has, like the lever shown in FIG. 3, a mouth-like recess which partially surrounds the tie rod (16).
  • two screws (41, 36) are screwed into the part of the lever (40) which has the mouth-like recess.
  • the use of the magnetic switching device described above is of course not limited to the exemplary embodiment.
  • the magnetic switching device can be used wherever the position of one of two relatively movable parts is detected and z. B. to be used as a switching criterion. It is essential for a good function of the magnetic switching device described above that the part of the body consisting of the ferromagnetic material (in the exemplary embodiment part '23' of the piston '22, 23 ') is designed and guided such that it is that of the permanent magnet Exerted magnetic field acting on the switch can amplify when the body is close to the switch.
  • the one pole of the permanent magnet which is not connected to a switching element must face the body to be guided past the permanent magnet and a conductor made of a ferromagnetic material should also be provided on the switching element which is not constantly connected to the other pole of the permanent magnet, said conductor also facing the body is.
  • the reinforcement of the Magnetic flux and thus also the strengthening of the magnetic field takes place in the switch (11) according to the exemplary embodiment predominantly in the area of the switching element (9) which is not constantly connected to a pole of the permanent magnet.
  • the switch is biased at its connections with the corresponding magnetic field strength by the magnetic field generated by the two permanent magnets arranged opposite to each other.
  • Two lug-like projections which are connected to the permanent magnets in a magnetically conductive manner, can be provided on the housing and come to rest on the outer surface of the cylinder when the magnetic switching device is mounted on a cylinder.
  • a magnetic switch device of the type described above operates as follows. Since on both sides of the switch the field strength of the magnetic field generated by the two permanent magnets has the opposite polarity but the same amount, the switch is not excited to switch.
  • Switching of the contacts can only be achieved if the switch is either moved closer to one or the other of the two permanent magnets, or if the magnetic field of one of the two permanent magnets is disturbed and the other permanent magnet gains influence. Will the one with the Piston provided ferromagnetic part moved in the working cylinder and thereby comes close to one of the permanent magnets, so the field lines take the path of smaller resistance (via the ferromagnetic part provided on the piston) and shift out of their earlier course. The magnetic field disturbance thus caused causes the contacts of the switch to switch. The shifting of the field lines causes an intensification of the magnetic field in the area of the contacts of the switch.
  • field plates can also be arranged in the magnetic switching device described.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Push-Button Switches (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Massaging Devices (AREA)
  • Switches With Compound Operations (AREA)

Claims (4)

  1. Dispositif magnétique de commutation, notamment pour vérin hydraulique ou pneumatique (1), dispositif dans lequel à un commutateur (11) susceptible d'être actionné en fonction d'un champ magnétique, est associé au moins un aimant permanent (14) qui est perpendiculaire à la trajectoire de déplacement d'un corps (23) constitué au moins partiellement d'un matériau ferromagnétique, tandis qu'un pôle (S) de cet aimant se trouve en regard de cette trajectoire de déplacement, si bien que ce corps (23) lorsqu'il s'approche de l'aimant permanent (14) sert à amplifier le champ magnétique produit par celui-ci, grâce à quoi le commutateur (11) est susceptible de fonctionner sans contact, et en ce que le commutateur (11) est disposé dans un boîtier (3) et en ce qu'un autre pôle (N) de l'aimant permanent (14) est relié d'une façon magnétiquement conductrice à un premier organe de commutation (12) du commutateur (11), dispositif magnétique de commutation caractérisé en ce que :
    a) le commutateur (11) et l'aimant permanent (14) sont disposés l'un à côté de l'autre dans un compartiment distinct (8) du boîtier (3) et le boîtier est ouvert sur son côté en regard de la trajectoire de déplacement,
    b) le commutateur (11) comporte un second organe de commutation (9) dont un fil de raccordement (5) s'étend également sur le côté en regard de la trajectoire de déplacement du corps ferromagnétique (23),
    c) le fil de raccordement (5) ainsi qu'un second fil de raccordement (13) sont respectivement amenés à des languettes de contact (6, 10),
    d) un connecteur (7) est disposé sur le côté supérieur du boîtier (3) sur les languettes de contact (6, 10).
  2. Dispositif magnétique de commutation selon la revendication 1, caractérisé en ce que le boîtier (3) est fixé sur les tirants d'ancrage (16) du vérin (1) au moyen d'un levier (34) fixé par articulation.
  3. Dispositif magnétique de commutation selon la revendication 2, caractérisé en ce que le boîtier (3) est fixé de façon à pouvoir être déplacé en direction de l'axe longitudinal du vérin (1).
  4. Dispositif magnétique de commutation selon les revendications 1 à 3, caractérisé en ce que le boîtier (3) est susceptible d'être réglé en direction transversale par rapport à l'axe longitudinal du vérin (1).
EP86106629A 1985-06-29 1986-05-15 Dispositif de commutation fonctionnant sans contact par détecteur de proximité Expired - Lifetime EP0207270B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86106629T ATE84910T1 (de) 1985-06-29 1986-05-15 Beruehrungslos arbeitende naeherungsschalteinrichtung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3523371 1985-06-29
DE3523371 1985-06-29
DE19863609537 DE3609537A1 (de) 1985-06-29 1986-03-21 Beruehrungslos arbeitende naeherungsschalteinrichtung
DE3609537 1986-03-21

Publications (3)

Publication Number Publication Date
EP0207270A2 EP0207270A2 (fr) 1987-01-07
EP0207270A3 EP0207270A3 (en) 1988-09-14
EP0207270B1 true EP0207270B1 (fr) 1993-01-20

Family

ID=25833593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106629A Expired - Lifetime EP0207270B1 (fr) 1985-06-29 1986-05-15 Dispositif de commutation fonctionnant sans contact par détecteur de proximité

Country Status (5)

Country Link
US (1) US4680436A (fr)
EP (1) EP0207270B1 (fr)
AT (1) ATE84910T1 (fr)
BR (1) BR8603000A (fr)
DE (2) DE3609537A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752657A (en) * 1987-05-07 1988-06-21 Allied Automation Systems, Inc. Proximity switch mounting apparatus
EP0297150B1 (fr) * 1987-06-27 1990-08-29 Pulsotronic Merten GmbH & Co. KG Détecteur de position pour la part mobile d'un servomoteur actionné par fluide
FR2620530B1 (fr) * 1987-09-16 1991-04-12 Celduc Dispositif de capteur a effet electrique
DE3734525A1 (de) * 1987-10-13 1989-04-27 Festo Kg Insbesondere in abhaengigkeit von bestimmten kolbenstellungen eines kolben-zylinder-aggregates betaetigbare schaltanordnung
US4800241A (en) * 1987-11-16 1989-01-24 Allied Automation Systems, Inc. Proximity switch mounting plate
DE9010114U1 (de) * 1990-07-03 1990-09-06 Festo KG, 7300 Esslingen Arbeitszylinder
US5219068A (en) * 1991-07-16 1993-06-15 Cincinnati Milacron, Inc. Adjustable proximity switch mounting assembly
US5285652A (en) * 1993-04-08 1994-02-15 General Electric Company Sensor for pressure controlled switching valve for refrigeration system
US5704813A (en) * 1995-12-13 1998-01-06 Namco Controls Corporation Proximity sensor housing and arrangement
CH691003A5 (fr) * 1996-08-13 2001-03-30 Parker Lucifer Sa Tête de commande électro-pneumatique pour actuateurs.
US8375801B2 (en) * 2010-12-20 2013-02-19 Sondex Limited Sensitive differential pressure sensor and method
DE102018105255B4 (de) 2018-03-07 2023-01-26 Sick Ag Vorrichtung zur Befestigung eines Sensors an einem Hygienezylinder
CN109530652A (zh) * 2018-11-08 2019-03-29 贵州华昌汽车电器有限公司 一种压铸模具用的接插式不锈钢感应油缸

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DE1290223B (de) * 1965-02-19 1969-03-06 Siemens Ag Schaltgeraet mit magnetisch zu betaetigenden Schaltern, insbesondere fuer Aufzugsanlagen
DE1590157C3 (de) * 1966-09-29 1973-10-18 Robert Bosch Gmbh, 7000 Stuttgart Magnetisch gesteuerte Schaltvorrichtung
CH460127A (de) * 1967-04-21 1968-07-31 Zellweger Uster Ag Verfahren und Näherungsschalter zum Schalten von Stromkreisen durch ferromagnetische Körper
DE7430805U (de) * 1974-09-13 1976-03-25 Robert Bosch Gmbh, 7000 Stuttgart Ansatzkörper, insbesondere Magnetfeldschalter
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Also Published As

Publication number Publication date
DE3687547D1 (de) 1993-03-04
EP0207270A3 (en) 1988-09-14
BR8603000A (pt) 1987-02-17
DE3609537A1 (de) 1987-01-08
US4680436A (en) 1987-07-14
ATE84910T1 (de) 1993-02-15
EP0207270A2 (fr) 1987-01-07

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