EP1103728A2 - Endlagengeber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung - Google Patents

Endlagengeber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung Download PDF

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Publication number
EP1103728A2
EP1103728A2 EP00111722A EP00111722A EP1103728A2 EP 1103728 A2 EP1103728 A2 EP 1103728A2 EP 00111722 A EP00111722 A EP 00111722A EP 00111722 A EP00111722 A EP 00111722A EP 1103728 A2 EP1103728 A2 EP 1103728A2
Authority
EP
European Patent Office
Prior art keywords
locking
end position
piston
contact
working cylinder
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
EP00111722A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1103728A3 (de
EP1103728B1 (de
Inventor
Josef Büter
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.)
Buemach Engineering International BV
Original Assignee
Buemach Engineering International BV
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 Buemach Engineering International BV filed Critical Buemach Engineering International BV
Publication of EP1103728A2 publication Critical patent/EP1103728A2/de
Publication of EP1103728A3 publication Critical patent/EP1103728A3/de
Application granted granted Critical
Publication of EP1103728B1 publication Critical patent/EP1103728B1/de
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
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
    • 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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the invention relates to a sensor for pneumatic or hydraulic working cylinder with end position locking, after locking in the respective end position responds.
  • a limit switch for working cylinders for contactless scanning the position of a piston in a working cylinder is described in the publication DE 29 16 500 C2, the a permanent magnet and Hall generator arranged in the housing has, the permanent magnet arranged so is that the field lines transverse to the direction of movement of a ferromagnetic pistons and run through baffles be limited in order to detect the position of the piston more precisely.
  • This and other contactless sensors are to with regard to an exact position allocation imprecise, because they have a switching range, a certain one Switching point is not reproducible, which is the case with position-dependent Follow-up circuits lead to problems.
  • DE 33 02 255 A1 describes a device for displaying the end position of a piston in a cylinder disclosed, in the leading to the working cylinder Hydraulic line a measuring cylinder with a measuring piston and electrical contacts is arranged at the End position that the reaching of the end position of the working cylinder corresponds to be closed.
  • This solution is through the complicated additional measuring cylinder that exactly the respective Adapting the working cylinder used is complex and expensive. Due to the different installation locations incorrect displays can also occur due to temperature differences.
  • the object of the invention is to develop a Encoder for pneumatic or hydraulic working cylinders with end position locking, which after locking responds in the respective end position, within the working cylinder arranged with reproducible switching point, temperature-independent, independent of pressure, robust and simple and is inexpensive to implement
  • the essence of the invention consists in the formation of an existing contact pin, which is electrically insulated from the working cylinder and a locking piston of an end position locking unit as a closer for pneumatic or hydraulic working cylinders with end position locking, which, after locking in the end position, provides an electrically conductive connection to the potential of the working cylinder by the locking piston beyond the position necessary for the actual locking can be moved to a limited extent.
  • a working cylinder with end position locking for both end positions it is possible to arrange one encoder for the assigned end position, whereby on both sides of the working cylinder piston, symmetrically to the vertical main axis of the piston, a lockable modular unit with a locking piston that can be moved beyond the position required for locking is releasable to be assembled.
  • the advantages of the invention are particularly in the closing of the contact after the locking in the respective End position so that misleading to actual End position are excluded.
  • Thanks to the modular arrangement on the working cylinder piston is the optional assembly for the required end position signaling in one of the end positions as well for both End positions possible.
  • a working cylinder acting on the principle of the solution known from utility model DE 298 09 717.6 for locking the end position of hydraulic working cylinders, essentially consisting of a piston 2 fastened to a piston rod 1 in a cylinder tube 3 with a guide closure part 4 and a bottom closure part 5, two mechanically acting modular units 6 for end position locking being connected symmetrically to the main axis of the piston 2, preferably by screwing, which according to FIG. 2 consist of a locking piston 7, a locking piston spring 8, a locking element carrier 9 and segmented locking bodies 10 as locking elements, the hardness of which is lower to avoid damage to the inner wall of the cylinder tube 3, in contrast.
  • the segmented locking bodies 10 are correspondingly moved into a position such that they move by means of the locking piston 7 which is displaced by the preload of the locking piston spring 8 due to its different diameter with a conical transition on its surface sliding into a recess 11 in the guide closure part 4 and in the bottom closure part 5, which has a chamfer 12 in the direction of movement of the piston 2 for easier unlocking, whereby a positive axial load-bearing detent, locking is effected.
  • the recess 11 is arranged in the guide closure part 4 and in the bottom closure part 5 so that the segmented locking body 10 with its inner surface 13 completely rest on a larger lateral surface 14 of the locking piston 7, which still has sufficient stroke to make contact when it is moved further to produce a contact pin 17 arranged in a screw housing 15 with an insulating bushing 16 in the guide closure part 4 and in the bottom closure part 5 in an electrically insulated manner.
  • the contact pin 17 is arranged in the vicinity of the recess 11 so that the contact between the locking piston 7 and the contact pin 17 is only made when the locking has been carried out with the aid of the segmented locking body 10, but without the locking piston 7 reaching its end position on assigned end stop 18 has already reached.
  • the contact pin 17 can optionally be made telescopically resilient or the area of the locking piston 7 required for the contact can be made elastically deformable.
  • the total stroke of the locking piston 7 should therefore be chosen to be larger than the stroke required to close the contact.
  • the total stroke H G results from the sum of the stroke required to close the contact H K and the free stroke until the end stop 18 H F is reached after the contact has been made.
  • H G H K + H F
  • HF can be in a range from 2 to 4 millimeters, so that reliable contacting between the contact pin 17 and the locking piston 7 is ensured.
  • the contact produced can be evaluated in a known manner, for example by making a ground connection 19 to a voltage source 20 at any point on the differential power cylinder, with a load 21, the flowing of which, lies in the further connection of the voltage source 20 to the outer connections of the contact pins 17 Current or voltage drop with closed contact between the contact pin 17 and the locking piston 7 is used to ground for evaluation or signaling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP00111722A 1999-11-24 2000-06-02 Endlagengeber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung Expired - Lifetime EP1103728B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29920657U 1999-11-24
DE29920657U DE29920657U1 (de) 1999-11-24 1999-11-24 Endlagengeber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung

Publications (3)

Publication Number Publication Date
EP1103728A2 true EP1103728A2 (de) 2001-05-30
EP1103728A3 EP1103728A3 (de) 2003-10-15
EP1103728B1 EP1103728B1 (de) 2005-08-17

Family

ID=8082044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00111722A Expired - Lifetime EP1103728B1 (de) 1999-11-24 2000-06-02 Endlagengeber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung

Country Status (3)

Country Link
EP (1) EP1103728B1 (ar)
AT (1) ATE302347T1 (ar)
DE (2) DE29920657U1 (ar)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022101020A1 (de) 2022-01-18 2023-07-20 Schaeffler Technologies AG & Co. KG Hydrauliksystem und Verfahren zum Betreiben eines Hydrauliksystems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302255A1 (de) 1983-01-24 1984-07-26 Paul Pleiger Maschinenfabrik, 5810 Witten Vorrichtung fuer die anzeige der endstellung eines kolbens in einem zylinder
DE2916500C2 (ar) 1979-04-24 1990-02-15 Robert Bosch Gmbh, 7000 Stuttgart, De
DE29809717U1 (de) 1998-05-29 1998-08-20 Buemach Engineering Internatio Endlagenverriegelung hydraulischer Arbeitszylinder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177780A (en) * 1963-05-27 1965-04-13 Roger K Andersen Locking cylinder
US4140045A (en) * 1975-11-19 1979-02-20 Fenix & Scisson, Inc. Piston positioning indicator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916500C2 (ar) 1979-04-24 1990-02-15 Robert Bosch Gmbh, 7000 Stuttgart, De
DE3302255A1 (de) 1983-01-24 1984-07-26 Paul Pleiger Maschinenfabrik, 5810 Witten Vorrichtung fuer die anzeige der endstellung eines kolbens in einem zylinder
DE29809717U1 (de) 1998-05-29 1998-08-20 Buemach Engineering Internatio Endlagenverriegelung hydraulischer Arbeitszylinder

Also Published As

Publication number Publication date
ATE302347T1 (de) 2005-09-15
DE50010966D1 (de) 2005-09-22
EP1103728A3 (de) 2003-10-15
EP1103728B1 (de) 2005-08-17
DE29920657U1 (de) 2000-02-24

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