EP2546027B1 - Dispositif de serrage - Google Patents

Dispositif de serrage Download PDF

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Publication number
EP2546027B1
EP2546027B1 EP20110005819 EP11005819A EP2546027B1 EP 2546027 B1 EP2546027 B1 EP 2546027B1 EP 20110005819 EP20110005819 EP 20110005819 EP 11005819 A EP11005819 A EP 11005819A EP 2546027 B1 EP2546027 B1 EP 2546027B1
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EP
European Patent Office
Prior art keywords
clamping
clamping device
jaws
pressure chambers
base
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.)
Active
Application number
EP20110005819
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German (de)
English (en)
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EP2546027A1 (fr
Inventor
Rudolf Hofstetter
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.)
Hofstetter Vorrichtungs- & Maschinenbau GmbH
Original Assignee
Hofstetter Vorrichtungs- & Maschinenbau 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.)
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Publication date
Application filed by Hofstetter Vorrichtungs- & Maschinenbau GmbH filed Critical Hofstetter Vorrichtungs- & Maschinenbau GmbH
Priority to EP20110005819 priority Critical patent/EP2546027B1/fr
Publication of EP2546027A1 publication Critical patent/EP2546027A1/fr
Application granted granted Critical
Publication of EP2546027B1 publication Critical patent/EP2546027B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/18—Arrangements for positively actuating jaws motor driven, e.g. with fluid drive, with or without provision for manual actuation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways

Definitions

  • the present invention relates to a clamping device with clamping jaws, which occupy a defined clamping distance in a clamping position, in which a workpiece is held.
  • the object of the present invention is thus to develop a generic clamping device such that the need for retrofitting when changing the workpiece is at least reduced, but preferably omitted.
  • clamping device With the clamping device according to the invention workpieces can be clamped with different dimensions. Depending on the size and dimensions of the clamping device according to the invention different clamping distances can be adjusted over a large length range. The need for retrofitting is thus eliminated, at least in the area of these clamping distances. This significantly simplifies the clamping of workpieces of different dimensions. The labor and material costs for the conversion eliminated.
  • the clamping device according to the invention can for a variety of workpiece clamping systems to be used. In particular, an assembly of several fixtures on a tension tower is possible.
  • the clamping device according to the invention is also very well suited for use with working robots and can in particular be equipped quickly and purposefully by means of working robots.
  • the clamping device according to the invention can be automated in a simple manner by means of an electronic control, and all settings can be made without manual intervention, in particular be preprogrammed.
  • the present invention consists in that the adjusting device is accommodated in a guide housing, in which a guide element is movably guided via a defined adjustment path, the guide element is operatively connected to at least one clamping jaw and the guide element can be fixed in the guide housing for presetting different defined clamping distances.
  • This embodiment is robust and easy to use.
  • the Justierweg determines and limits both the maximum and the minimum clamping distance of the clamping jaws.
  • the design of the clamping device according to the invention for different clamping distances can therefore be particularly easily determined over the length of the Justierwegs.
  • the guide element on a clamping bolt which is provided at its free end with a clamping piece which is in operative connection with at least one clamping jaw.
  • the clamping bolt is received in a cavity provided in the guide element, which forms pressure chambers for hydraulic or pneumatic control of the adjusting device.
  • a compression spring is arranged in a pressure chamber and that the guide element by pressing the clamping bolt against the spring force the compression spring in the guide housing can be unlocked. The guide element is thus in the locked state under resilient bias and is securely fixed in this way.
  • a further preferred development of the present invention consists in that the adjusting device is assigned an adjusting device for setting a clamping stroke. After setting a defined clamping distance for certain workpieces thus the adjustment must not be moved to tension these workpieces during the processing operation in succession and release again.
  • the adjusting device may in particular be designed such that it has a Verstellanschlag, which is in operative connection with the adjusting device and determines the position and the length of the clamping stroke in the clamping device.
  • the adjustment stop is in operative connection with a setting piston which is hydraulically or pneumatically controllable via pressure chambers in order to be able to determine the position of the adjustment stop as accurately as possible.
  • the clamping jaws are preferably mounted on base jaws, so that the adjusting device and the adjusting device do not attack directly on the clamping jaws and thereby hinder the clamping of the workpiece. Therefore, the adjustment device is expediently arranged in a base jaw.
  • the adjusting device is in direct operative connection with a clamping jaw.
  • the resilient bias ensures a play-free engagement between the double gear and racks and thus a backlash-free movement of the base jaws.
  • adjusting device is in direct operative connection with a clamping jaw, while the second clamping jaw is stationary. In this case, synchronization is not required.
  • both clamping jaws of the clamping device according to the invention, each with an adjusting device are in direct operative connection.
  • Each base jaw is preferably arranged movably on a bolt fixed to the housing, wherein the base jaws are preferably pneumatically or hydraulically controllable via pressure chambers.
  • each bolt has a pressure plate and is received in a recess provided in the base jaw in such a way that the recess is divided into the pressure chambers by means of the pressure plate.
  • the bolts contain fluid lines for the hydraulic or pneumatic supply of the tensioning device, which are connected to two switching devices (10a, 10b) for actuating two valves.
  • the tensioning device which are connected to two switching devices (10a, 10b) for actuating two valves.
  • a housing is preferably provided, wherein the base jaws are guided in horizontally extending in the housing guide grooves.
  • FIGS. 1 and 2 show an embodiment of a tensioning device 100 according to the invention.
  • the tensioning device 100 according to the invention may, for example, be fastened in a manner known per se to a tensioning tower.
  • the clamping device 100 has a housing 45 consisting of a base plate 1, two vertical side walls 2 and two guide strips 3.
  • the base plate 1, the vertical side walls 2 and the guide rails 3 may form a one-piece or multi-piece housing 45.
  • the housing 45 is formed in several pieces.
  • the two vertical side walls 2 are mounted along their longitudinal edges.
  • the guide rails 3 are fixed, which each form a horizontally extending guide groove 23 with the associated side wall 2.
  • each base jaw 4 is a jaw 7 with a workpiece support 7 'attached.
  • the clamping jaws 7 define and limit a clamping opening 43 with a clamping distance S, S '.
  • a cover plate 6 is provided, which is fixed on the guide rails 3.
  • a guide housing 8 for driving at least one base jaw 4 is provided.
  • a valve body 9 is further attached, the valves (not shown) for fluid supply of the clamping device 100 according to the invention receives.
  • Valve body and / or switching devices can, for example, also be provided on a tensioning tower and serve for supplying fluid to a plurality of clamping devices mounted on the tensioning tower according to the invention.
  • each base jaw 4 is moved by means of a fluid (for example hydraulic fluid or compressed air) in order to open and close the clamping jaws 7.
  • a fluid for example hydraulic fluid or compressed air
  • each base jaw 4 is arranged movably on a bolt 12 along the double arrow A.
  • the bolts 12 are fixedly connected to a bearing block 11, for example, pressed, screwed or welded, and each have a pressure plate 24 at its free end.
  • Each bolt 12 is received with its free end including the pressure plate 24 in a provided in each base jaw 4 recess.
  • Each pressure plate 24 divides each recess into an inner pressure chamber 30 and an outer pressure chamber 31 for receiving the fluid.
  • the outer pressure chamber 31 is closed by a closure lid 5.
  • the pressurization of the pressure chambers 30, 31 with the fluid takes place in a manner known per se via fluid lines 25 arranged in the bolts 12, which are connected to the valve body 9 and the switching device 10a (not shown).
  • the control of each individual pressure chamber 30, 31 is carried out in a conventional manner via arranged in the fluid lines 25 check valves (not shown).
  • the clamping device 100 can also be used for clamping a workpiece from the inside, if the workpiece has a cavity suitable for clamping (see the dashed representation in FIG FIG. 2 ).
  • the inner pressure chambers 30 are acted upon, so that the Base jaws 4 on the bolt 12 moves inward, and the jaws 7 release the workpiece.
  • the outer pressure chambers 31 are acted upon, the base jaws 4 are moved on the bolt 12 to the outside, so that the workpiece between the clamping jaws 7 is tensioned.
  • the clamping distance S 'between the clamping jaws 7, in which the workpiece is tensioned in this case is greater than the distance between the clamping jaws 7, when the workpiece is released.
  • the workpiece 44 is tensioned from the outside. The clamping of a workpiece from the inside then results from the reversal of this description.
  • FIG. 3 To synchronize the movement of the base jaws 4 a per se known double gear transmission is provided, the structure in FIG. 3 is shown.
  • a rack 14 is mounted on each base jaw 4 and is engaged with a double gear 13 of two gears 13 ', 13 ".
  • the double gear 13 is supported on an axle 42 below the bearing block 11.
  • the two gears 13', 13" of the Double gear 13 are slightly offset from each other and resiliently biased in this position to ensure a play-free movement. In this way, only one base jaw 4 has to be actuated in order to actuate the tensioning device 100 according to the invention, while the second base jaw 4 is synchronously taken over by the double-toothed gear mechanism.
  • both base jaws 4 can be controlled with one adjusting device.
  • a base jaw 4 can be controlled with the adjusting device, while the base jaw is fixed, so that a double gear is not required.
  • FIG. 4a shows a partial view of the clamping device according to the invention FIG. 1 , wherein in a plan view, a section through the guide housing 8, the associated region of the side wall 2 and the associated region of a base jaw 4 are shown.
  • the guide housing 8 has a recess 26 which corresponds to a further recess 27 in the side wall 2.
  • the recesses 26, 27 together form a guide channel 28 for a two-part guide element 29.
  • the guide element 29 is formed from a guide body 15 and a guide cover 16, which are screwed together in the embodiment and form a cavity.
  • a clamping bolt 17 is received, the head of which divides the cavity into a lower pressure chamber 32 and an upper pressure chamber 33.
  • In the upper pressure chamber 33 is a compression spring 18, arranged in the embodiment, a plate spring which presses the clamping bolt 17 against the pressure chamber 32 and the guide cover 16.
  • the pressure chambers 32, 33 are supplied via fluid lines that lead from the switching device 10b and the valve body 9 through the side wall 2 of the housing 45 to the guide housing 8 and through the guide member 29 into the pressure chambers 32, 33 open (not shown).
  • the control of each individual pressure chamber 32, 33 takes place in a conventional manner via arranged in the fluid lines check valves (not shown).
  • the free end of the clamping bolt 17 protrudes through a cavity 36 in the side wall 2 in a recess of the base jaw 4.
  • a clamping piece 19 is fixed, for example. Pressed or welded.
  • the clamping piece 19 is guided in a recess 37 in the side wall and also protrudes into the base jaw 4 inside.
  • the clamping piece 19 engages in a recess 38 of a Verstellanschlags 20, which is slidably received in the base jaw 4.
  • the recess 38 in this case is slightly longer (in the exemplary embodiment about 2-3 mm) than the dimension of the clamping piece 19 in the region projecting into the recess. This difference in length defines a clamping stroke H.
  • the adjusting stop 20 is associated with a setting piston 22, at the end of the adjusting stop 20 facing a stroke stop 21 fixedly mounted, for example, is pressed or screwed.
  • the stroke stop 21 is guided in a guide space 39 formed by the side wall 2 and the base jaw 4, in which one end of the adjustment stop 20 protrudes.
  • the adjustment stop 20 facing away from the end of the adjusting piston 22 is received in a cavity, such that an inner pressure chamber 34 and an outer pressure chamber 35 are formed.
  • the outer pressure chamber 35 is closed with a closure plug 41.
  • the pressure chambers 34, 35 fluid lines are supplied, leading from the switching device 10b and the valve body 9 through the base plate 1 in the base jaw 4 and from there into the pressure chambers 34, 35 open, the pressure chambers 34, 35 in each position of the base jaw 4 with Fluid can be applied.
  • the control of each individual pressure chamber 34, 35 takes place in a conventional manner via arranged in the fluid lines check valves (not shown).
  • FIG. 4a shows a starting position in which the clamping jaws 7 are opened as far as possible.
  • the lower pressure chamber 32 is acted upon, whereby the plate spring 18 is compressed.
  • the clamping bolt 17 and the guide element 29 are raised by a little.
  • the guide member 29 is unlocked in this way.
  • the base jaws 4 and thus the clamping jaws 7 are moved apart until the guide element 29 has reached the end of the guide channel 28 and the clamping piece 19 has reached the end of the recess 37.
  • the adjustment stop 20 is located with its clamping opening 43 facing the end of the clamping piece 19 and the base jaw 4, as it is in FIG.
  • a new clamping distance S can be set for a new workpiece 44 to be clamped.
  • the length of the recess 27 determines the maximum adjustment path J, ie the maximum distance that the guide element 29 can travel in the guide channel 28.
  • the maximum clamping difference is defined, which can be bridged with the device 100 according to the invention.
  • a clamping difference of 70mm can be bridged, ie each jaw 7 can be moved over a distance of 35mm.
  • the size of the clamping difference depends solely on the size and dimensions of the clamping device according to the invention and can be adapted to the respective requirements.
  • the pressurization of the pressure chamber 35 has the result that the adjusting piston 22 initially displaces the adjusting stop 20 by the clamping stroke of 2 to 3 mm until its end facing the adjusting piston 22 bears against the clamping piece 19.
  • the desired clamping position is reached, ie the workpiece 44 is tight, but not yet ready for processing.
  • the guide element 29 has reached the desired end position. This clamping position is in FIG. 4b shown.
  • the pressure chambers 32 and 35 are relaxed and the pressure chamber 33 is acted upon.
  • the relaxation of the pressure chamber 32 and the application of the pressure chamber 33 cause the guide member 29 in the in FIG. 4b set end position is set. This defines the clamping distance S required for the workpiece 44 to be clamped.
  • the relaxation of the pressure chamber 35 causes the adjustment piston 22 moves back to its original position, as in FIG. 4a is shown and is no longer in operative connection with the adjustment stop. In this position, the workpiece 44 is still clamped.
  • the distance between the clamping opening 43 facing the end of the Verstellanschlags 20 and the clamping piece 19 defines the clamping stroke H defined, which is about 2 - 3 mm in the embodiment.
  • the device 100 according to the invention must be opened again in order to insert the workpiece 44 correctly into the clamping opening 43 and to tension it.
  • the pressure chambers 31 are acted upon to move the base jaws 4 and thus the clamping jaws 7 apart again.
  • This situation is in Figure 4c shown.
  • the base jaws 4 can be moved apart only over the path of the clamping stroke H, ie until the clamping opening 43 facing the end of the adjusting stop 20 abuts the clamping piece 19.
  • the Clamping stroke H is now the distance between the adjusting piston 22 facing the end of Verstellanschlags 20 and the clamping piece 19.
  • the limitation of the clamping stroke H ensures that later to be clamped workpieces 44 can be safely stored on the workpiece tray 7 'of the clamping jaws 7.
  • the workpiece 44 is released and is, for example. Of a robot arm, placed on the workpiece support 7 'of the jaws 7 and re-tensioned. For this purpose, again the pressure chambers 30 are acted upon, so that the base jaws 4 and the clamping jaws 7 are moved together by the amount of the clamping stroke H until the workpiece 44 is tensioned. Subsequently, a so-called. Overpressure, ie a finished clamping of the workpiece 44, wherein only the base jaws 4 and the clamping jaws 7 are moved. The adjustment stop 20 stops. The workpiece 44 is now ready for processing. This situation is in FIG. 4d shown.
  • any number of identical workpieces 44 can be stretched and edited, in which the clamping jaws 7 are always opened and closed as described only over the path of the clamping stroke H.
  • the guide member 29 remains fixed in the guide channel 28, defines the clamping distance S and limited by the interaction of the clamping piece 19 with the adjustment stop 20 the clamping stroke H.
  • All pressure chambers 30, 31 for clamping and releasing the workpieces 44 are driven in the embodiment via the switching device 10a and supplied by means provided in the bolt 12 drilled fluid lines 25.
  • All pressure chambers 32, 33, 34, 35 for setting the respective clamping distance S are controlled in the exemplary embodiment via the switching device 10b and supplied by means of separate, running in the clamping device 100 drilled fluid lines.
  • This embodiment also contributes to the simple structure and high reliability of the clamping device 100 according to the invention, since in particular only two switching devices 10a, 10b are required for operating the clamping device according to the invention.
  • the operation of the device 100 according to the invention can be carried out in a manner known per se by means of an electronic control, so that all the settings described above can be pre-programmed, for example, so that the device 100 according to the invention can be used without manual intervention, for example in shift or continuous operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Claims (12)

  1. Dispositif de serrage (100) avec mâchoires de serrage (7) qui sont disposées à une distance de serrage (S) définie dans laquelle une pièce à usiner (44) est maintenue, un dispositif d'ajustage (29, 17, 19) étant prévu pour prérégler des distances de serrage différentes et définies en fonction des dimensions des pièces à usiner (44) à serrer, caractérisé en ce que le dispositif d'ajustage (29, 17, 19) est logé dans un logement de guidage (8), dans lequel un élément de guidage (29) est guidé de manière mobile le long d'un chemin d'ajustage (J), que l'élément de guidage (29) est en liaison de coopération avec au moins une mâchoire de serrage (7), que l'élément de guidage (29) peut être fixé dans le logement de guidage (8) pour prérégler des distances de serrage (S) définies et différents, que l'élément de guidage (29) possède un boulon de serrage (17) ayant une pièce de serrage (19) à son extrémité libre, lequel est en liaison de coopération avec au moins une mâchoire de serrage (7), et que le boulon de serrage est reçu dans une cavité disposé dans l'élément de guidage (29), laquelle cavité formant des chambres de pression (32, 33) pour le contrôle hydraulique ou pneumatique du dispositif d'ajustage (29, 17, 19).
  2. Dispositif de serrage selon la revendication 1, caractérisé en ce que une chambre de pression (33) possède un ressort de pression (18) et que l'élément de guidage (29) peut être déverrouillé dans le logement de guidage (8) par l'actionnement du boulon de serrage (17), à l'encontre de la force du ressort de pression (18).
  3. Dispositif de serrage selon l'une des revendications 1 ou 2, caractérisé en ce que un dispositif de réglage (20, 21, 22) pour régler un course de serrage (H) est associé à l'élément de guidage (29).
  4. Dispositif de serrage selon la revendication 3, caractérisé en ce que le dispositif de réglage possède une butée de réglage (20) qui est en liaison de coopération avec le dispositif d'ajustage (29, 17, 19) et qui définit la position et la longueur du course de serrage (H).
  5. Dispositif de serrage selon la revendication 4, caractérisé en ce que la butée de réglage (20) est en liaison de coopération avec un piston de réglage (22), qui peut être contrôlé de manière hydraulique ou de manière pneumatique par des chambres de pression (34, 35).
  6. Dispositif de serrage selon l'une quelconque des revendications précédentes, caractérisé en ce que les mâchoires de serrage (7) sont attachées à des mâchoires de base (4).
  7. Dispositif de serrage selon l'une quelconque des revendications 3 à 6, caractérisé en ce que le dispositif de réglage (20, 21, 22) est déposé dans une mâchoire de base (4).
  8. Dispositif de serrage selon l'une des revendications 6 ou 7, caractérisé en ce que chaque mâchoire de base (4) est reliée à une crémaillère, qui s'engrène avec une roue dentée double (13) étant montée à rotation dans le dispositif de serrage (100).
  9. Dispositif de serrage selon l'une quelconque des revendications 6 à 8, caractérisé en ce que chaque mâchoire de base (4) est montée de manière mobile sur un boulon (12) ayant une position fixe et que chaque mâchoire de base (4) peut être contrôlé de manière hydraulique ou de manière pneumatique par des chambres de pressure (30, 31).
  10. Dispositif de serrage selon la revendication 9, caractérisé en ce que chaque boulon (12) possède une plaque de pression (24) et est reçu dans une échancrure disposée dans une mâchoire de base (4) de sorte que l'échancrure est partagée en les chambres de pression (30, 31) par la plaque de pression (24).
  11. Dispositif de serrage selon l'une des revendications 9 ou 10, caractérisé en ce que le dispositif de serrage (100) possède des conduites de fluide (25) forés pour l'approvisionnement hydraulique ou pneumatique des chambres de pressure (30, 31; 32, 33; 34, 35), qui sont reliés à deux dispositifs de commutation (10a, 10b).
  12. Dispositif de serrage selon l'une quelconque des revendications 6 à 11, caractérisé en ce que il possède un logement (45) et que les mâchoires de base (4) sont guidées dans des rainures (23) s'étendant horizontalement dans le logement (45).
EP20110005819 2011-07-15 2011-07-15 Dispositif de serrage Active EP2546027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20110005819 EP2546027B1 (fr) 2011-07-15 2011-07-15 Dispositif de serrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110005819 EP2546027B1 (fr) 2011-07-15 2011-07-15 Dispositif de serrage

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EP2546027A1 EP2546027A1 (fr) 2013-01-16
EP2546027B1 true EP2546027B1 (fr) 2014-05-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022116645A1 (de) 2022-07-04 2024-01-04 Ludwig Ehrhardt Gmbh Zentrumspanner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018008428A1 (de) 2018-10-26 2020-04-30 zwo17 GmbH & Co. KG Vorrichtung zum Bearbeiten eines Werkstücks

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Publication number Priority date Publication date Assignee Title
US2683386A (en) * 1952-06-21 1954-07-13 Specken Ag Fluid-pressure-operated vise having displaceable cylinder and adjustable piston
FR2613269A1 (fr) * 1987-03-31 1988-10-07 France Outillage Tech Appareil de serrage de pieces notamment pour machines-outils
US5139246A (en) * 1989-11-08 1992-08-18 Canon Kabushiki Kaisha Work clamping apparatus
US6522953B1 (en) * 1998-09-08 2003-02-18 Tcam Power Workholding Llc Thermal polymer clamping tool
DE19962380A1 (de) * 1999-12-23 2001-06-28 Saurer Allma Gmbh Maschinenschraubstock mit einer verschiebbaren Backe
DE10146076B4 (de) * 2001-09-11 2010-08-05 Albrecht Weber Spannwerkzeug
DE10201251A1 (de) * 2002-01-15 2003-07-24 Allmatic Jakob Gmbh & Co Spann Spann- beziehungsweise Greifsystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022116645A1 (de) 2022-07-04 2024-01-04 Ludwig Ehrhardt Gmbh Zentrumspanner
EP4302925A1 (fr) 2022-07-04 2024-01-10 Ludwig Ehrhardt GmbH Tendeur de centre

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