EP2258517A2 - Dispositif de serrage rapide doté d'une force de serrage réglable - Google Patents

Dispositif de serrage rapide doté d'une force de serrage réglable Download PDF

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Publication number
EP2258517A2
EP2258517A2 EP10162011A EP10162011A EP2258517A2 EP 2258517 A2 EP2258517 A2 EP 2258517A2 EP 10162011 A EP10162011 A EP 10162011A EP 10162011 A EP10162011 A EP 10162011A EP 2258517 A2 EP2258517 A2 EP 2258517A2
Authority
EP
European Patent Office
Prior art keywords
clamping
quick
unit
tensioning
clamping device
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.)
Withdrawn
Application number
EP10162011A
Other languages
German (de)
English (en)
Other versions
EP2258517A3 (fr
Inventor
Carsten Weihrauch
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP2258517A2 publication Critical patent/EP2258517A2/fr
Publication of EP2258517A3 publication Critical patent/EP2258517A3/fr
Withdrawn legal-status Critical Current

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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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/12—Arrangements for positively actuating jaws using toggle links
    • 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
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • B25B5/163—Jaws or jaw attachments

Definitions

  • the invention relates to a quick-release device according to the preamble of claim 1 for fastening and in particular for clamping tools or workpieces.
  • the invention further relates to a machine tool with such a quick-release device.
  • a quick-release device is a clamping device that can be loosened or fixed or tightened quickly and with little effort.
  • Quick clamping devices of the type in question are used in particular on machine tools for holding workpieces and tools.
  • Such a quick-release device which comprises a mechanical crank mechanism with a toggle mechanism.
  • the mechanical crank drive is used to implement a rotary drive movement in a translational adjusting movement of a clamping unit (eg a clamping jaw), which is done by power transmission by means of a so-called push crank. Due to the toggle mechanism high clamping forces can be achieved on the clamping unit with a relatively small amount of force.
  • the object of the invention is to provide such a quick-release device, which allows a reliable clamping even with frequent use.
  • the quick release device should also be designed to be compact and robust.
  • a quick-release device for clamping tools or workpieces comprising at least one clamping unit which is movable by means of at least one crank of a mechanical crank drive between a releasing and a tightening or locking position, wherein between at least one clamping unit and at least one of these moving Thrust crank at least one adjustable link is arranged, by means of which at a predetermined Stellwegin this clamping unit whose clamping force is adjustable.
  • a clamping unit By means of a clamping unit can indirectly and preferably directly exerted a clamping force on the fixed tool or workpiece directly to fix this.
  • This clamping force can be adjusted according to the invention.
  • the travel length is understood to mean the amount of travel that a tensioning unit covers between the fixed and the released position.
  • the travel length is mechanically predetermined at the quick-release device according to the invention and can not be changed. According to the invention, the adjustment of the clamping force is thus independent of this predetermined, mechanically induced Stellweglui.
  • a significant advantage of the quick-release device according to the invention is the fact that the clamping force can be individually adapted to a tool or workpiece to be clamped. Furthermore, the quick-release device according to the invention allows a repeatable clamping of the tool or workpiece, so that a readjustment of the set clamping force is not required, but would be easily possible. Another advantage is the fact that the quick release device according to the invention is relatively inexpensive. Further advantages are also a quick and easy handling of the quick-release device according to the invention and a low wear and a concomitant low maintenance.
  • the adjustable link is an adjusting screw, which serves the power transmission between the clamping unit and a push-crank head of the crank.
  • An essential aspect here is the separation between the Scllubkurbelkopfzapfen and the actual clamping unit, which is not known in such a way from the prior art.
  • a set screw offers u.a. the advantage that the adjustment of the clamping force can be made manually.
  • the longitudinal axis of the adjusting screw coincides with the translational movement direction of the clamping unit. This requires a simple adjustment of the clamping force and a compact design of the quick release device.
  • the adjustment of the adjusting screw at its end facing the thrust crank head end is variable.
  • the set screw is e.g. formed with a hexagon and / or mecanicsechskantprofil.
  • At least one spring which serves to space these components, is arranged between the push-crank head journal and the tensioning unit.
  • this is a weak compression spring, e.g. can be designed as a spiral spring and / or plate spring arrangement.
  • two parallel thrust cranks are provided for moving the tensioning unit, wherein these two thrust cranks are articulated to the opposite axial ends of the thrust crank pin.
  • means ie at least one) for locking the tensioning unit in its tightening position are provided on the quick-release device according to the invention. These are intended to prevent an automatic release of the clamping unit in the tightening position.
  • the clamping unit can be locked in its fixed-tensioning position by knotting at least one moving sliding crank.
  • an automatic release of the clamping unit can be effectively prevented. Further details will be explained in connection with the figures. Such a connection can also be combined with other means for locking the tensioning unit in the tightening position.
  • the quick-release device comprises at least one measuring device which detects the tightening position of the clamping unit and / or a locking of the clamping unit in the fixed-tensioning position.
  • a measuring means is e.g. a sensor, such as in particular an inductive sensor.
  • the tightening position of the clamping unit and / or a locking of the clamping unit can directly on the clamping unit or indirectly, z, B. on another component of the quick release device.
  • the clamping unit comprises at least one clamping hook T-shaped in cross-section.
  • a clamping hook is provided for engagement in a tool to be fastened or clamped. Further details will be explained in connection with the figures.
  • At least one such clamping hook is pivotally mounted on the clamping unit.
  • the pivoting range is preferably 90 °. Further details will be explained in connection with the figures.
  • a fixing device for temporary retention of such a pivotable clamping hook is included in such a mechanical stop. This may be e.g. to act a latching device and / or a magnetic device. Such a fixing device facilitates e.g. Handling when installing and removing a tool. Further details will be explained in connection with the figures.
  • the quick-release device least a measuring means for detecting the position at least one such pivotable clamping hook comprises.
  • a measuring means is z. B. a sensor, such as in particular an inductive sensor.
  • the measuring means or the sensor detects the position of the relevant clamping hook in one of the two possible Schwenkendpositionen. Further details will be explained in connection with the figures.
  • the quick-release device comprises at least one measuring means for direct and / or indirect detection of the clamping force of the clamping unit.
  • a measuring means may be useful in adjusting the clamping force.
  • a measuring means is e.g. a sensor in the form of a load cell or a strain gauge.
  • a strain gauge may e.g. be arranged on the clamping hook or on the shaft of a screw.
  • At least one further clamping unit is included in the quick-action clamping device, the clamping force of which is separately and in the same way, i. as explained above, is adjustable.
  • two separately adjustable clamping units are included, as explained below in connection with the figures.
  • the clamping units can be actuated jointly by means of an actuating device. Further details will be explained in connection with the figures.
  • the quick-release device may comprise a manual actuating device or a hydraulic and / or pneumatic actuating device.
  • the manual actuating device has in particular a manually operable gripping element. It can optionally be combined with a hydraulic and / or pneumatic actuator.
  • the quick-release device according to the invention has at least one device for aligning a tool or workpiece to be clamped. Further details will be explained in connection with the figures.
  • the quick release device may comprise a base body.
  • the main body serves to attach or to receive the individual components or component groups of the quick-release device. Such a body contributes to a robust and compact construction.
  • the invention further relates to a machine tool having at least one quick-release device according to the invention.
  • a machine tool is preferably a welding machine and in particular a projection welding machine.
  • the quick-release device is rigidly arranged on the machine tool and serves to hold a tool part (upper tool part or lower tool part).
  • the quick-release device according to the invention enables a simple and fast clamping of the tool part to the machine tool with relatively little effort.
  • At least one quick-release device has at least one means for aligning the tool part.
  • the position of a tool part to be fastened relative to the machine tool can be fixed in a repeatable manner in a simple manner.
  • Fig. 1 shows a preferred embodiment of the quick release device according to the invention in a perspective view.
  • the generally designated 1 quick release device serves as an example, the tightening of Tools in a machine.
  • the quick-release device 1 is preferably used for clamping a lower tool in a welding machine and in particular in a projection welding machine.
  • the quick-release device 1 comprises a main body 2, which accommodates the individual components and component groups explained in greater detail below, and by means of which the quick-action clamping device 1 is rigidly fastened to a machine (not shown).
  • the main body 2 is constructed in several parts, but can also be made in one piece, e.g. as a casting, be trained.
  • the positionally accurate attachment to the machine by means of screws and dowel pins through the holes 3 therethrough.
  • the contact surface for abutment on the machine body is located on the back of the quick-release device 1, which is not visible in this illustration.
  • the actuator 5 is fork-shaped and comprises two in cross-section respectively U-shaped legs 51 a and 51 b which are pivotally mounted on the base body 2.
  • the actuating device 5 is designed in several parts, but can also be made in one piece, e.g. as a casting, be trained.
  • a handle member 7 At which the legs 51 a and 51 b connecting crossbar 52 of the actuator 5 is attached via a lever extension device 6, a handle member 7 for manual operation.
  • a hydraulic and / or pneumatic actuator may be provided.
  • two longitudinally movable clamping units 9a and 9b each with a clamping hooks 93a and 93b are arranged.
  • the clamping hooks 93a and 93b perform an adjusting movement downwards or upwards, which is indicated by the double arrows b.
  • the quick-release device 1 is in the tightening state in which the clamping units 9a and 9b occupy a lower, tightening position.
  • the cross-sectionally T-shaped clamping hooks 93a and 93b can positively engage in corresponding T-slots on the tool to be clamped.
  • the Clamping hooks 93a and 93b pivotally mounted by 90 °, which is indicated by the arrows arches a. The pivoting is done manually.
  • Fig. 1 shows the pivoted position in which the clamping hooks 93a and 93b would engage in the tool, not shown.
  • stops or pads 10a and 10b are provided, on which the clamping hooks 93a and 93b come to rest or support.
  • the stops 10a and 10b each include a magnetic device 101, which serve the temporary fixation of the clamping hooks 93a and 93b in its swung-out position, which is particularly helpful in an inverted, upside-down arrangement of the quick release device 1.
  • the swung-out position of the right-hand cock hook 93b is detected by a sensor 12, e.g. can be an inductive sensor.
  • the sensor 12 is attached to a holder.
  • the signal from the sensor 12 may e.g. be transferred to the machine control, which e.g. operation of the machine for safety reasons then blocked as long as the clamping hook 93b is in the pivoted position and does not interfere with the tool to be clamped.
  • Such a sensor can also be provided for the left clamping hook 93a.
  • Fig. 2 shows the quick release device 1 in the released state in which the clamping units 9a and 9b occupy an upper, non-tightening position.
  • the clamping hooks 93a and 93b are manually brought into the pivoted position according to the arrows a, in which they engage in the corresponding T-slots in the tool to be clamped.
  • the grip element 7 is pivoted from the horizontal position shown by 90 ° downwards, which is indicated by a bow arrow c.
  • the entire operating unit 5 is pivoted about its pivot joints 14a and 14b also around 90 ° down.
  • the pivoting movement is limited in both directions by mechanical stops, whereby the pivoting angle of 90 ° is fixed.
  • the swivel angle may also have a deviating from 90 ° amount.
  • the pivoting movement of the actuating device 5 is implemented via two parallel, mechanical Kurbeitriebe with a mechanically predetermined transmission ratio in the translational actuating movements b of the clamping hooks 93a and 93b.
  • the pivoting movement of the actuator 5 is transmitted from the legs 51a and 51b thereof to the thrust cam bearings 15a and 15b to a total of four thrust cranks 17a and 18a and 17b and 18b.
  • the slider cranks 17a and 18a and 17b and 18b are parallel to each other and arranged in pairs.
  • crank cams 17a and 18a left side and 17b and 18b (right side) convert the pivotal movement on the thrust crank bearings 15a and 15b into a translatory movement on the thrust crank bearings 16a and 16b, which then serve as adjusting movement b for the tension hooks 93a and 93b is available.
  • the release of the quick release device 1 is effected by an opposite movement of the grip element 7 from the in Fig. 1 shown vertical position back to the horizontal position of the Fig. 2 ,
  • Fig. 3 shows a side view of the right side (as shown in FIG Fig. 1 ) of the quick release device 1.
  • the contact surface for abutment on the machine body is located on the right side.
  • the quick-release device 1 is in the tightening state, which is characterized in that the mechanical crank mechanisms have reached a dead center.
  • the visible crank-crank bearing 15b is in a lowest possible position, in which the longitudinal axis of the crank 17b, which connects the pivot points of the thrust crank bearings 15b and 16b, coincides with the direction of movement b of the tightening hook 93b.
  • the other thrust cranks 17a, 18a and 18b coincides with the direction of movement b of the tightening hook 93b.
  • the sensor 23 serves to detect the occlusion made on the basis of the position of the actuating device 5.
  • the sensor 23 may e.g. be an inductive sensor.
  • the sensor 23 is arranged on a holder.
  • the signal of the sensor 23 may e.g. be transferred to the machine control, which e.g. operation of the machine blocked for safety reasons, if no Verknieung or no locking in the tightening state has occurred. Alternatively, several such sensors may be provided.
  • the total possible pivotal movement of the gripping element 7 or the actuating device 5 comprises an arc of 90 °, including the Verknieung, which is about 3 °, as explained above. It is preferably provided that for clamping or loosening each of the total possible pivoting movement of 90 ° is performed.
  • This pivotal movement is accompanied by a fixed, mechanically induced travel length for the clamping units 9a and 9b or their clamping hooks 93a and 93b. In the embodiment explained here, the travel lengths are identical; however, these may alternatively be different.
  • the clamping force that can be used in the fixed-tensioning position on the tensioning hooks 93a and 93b can be set independently of their mechanically predetermined travel path lengths, ie that the respective travel length is determined by the Adjustment of the clamping force is not changed.
  • the change or adjustment of the clamping force will be described below with reference to Fig. 4 explained in more detail.
  • Fig. 4 shows a sectional view according to the in Fig. 3 specified section AA.
  • the quick release device 1 is according to Fig. 3 in the tightening state.
  • the representation in Fig. 4 is very good to see the structure of the clamping units 9a and 9b. These each comprise a linearly guided in the body 2 tendon 91 a and 91 b, where the clamping hooks 93a and 93b are pivotally mounted by means of a clamping bolt 92a and 92b.
  • the tendons 91 a and 91 b move to tighten up and to release upwards, they take the clamping hooks 93 a and 93 b, which is indicated by the double arrows b.
  • the tendons 91 a and 91 b are each connected via a set screw 25a and 25b non-positively and positively connected to the crank head pins 160a and 160b of the crank head bearings 16a and 16b.
  • the crankpins 160a and 160b are translationally moved by the paired thrust cranks 17a and 18a and 17b and 18b (mechanical crank mechanisms).
  • the longitudinal axes of the adjusting screws 25a and 25b coincide with the translational movement directions b of the clamping units 9a and 9b.
  • the screw heads of the adjusting screws 25a and 25b are formed with a hexagon socket and lie directly from below to the crank head pins 160a and 160b.
  • the set screws 25a and 25b extend with their shank through holes in the crank head pins 160a and 160b and engage with their threaded portions in the clamping members 91a and 91b, which have a corresponding threaded portion.
  • a rotation of the adjusting screws 25a and 25b causes each a change in distance between the crank crank pins 160a and 160b and the tendons 91a and 91b. With a reduction in distance can be generated at the same Stellwegfarin to the clamping units 9a and 9b and the clamping hooks 93a and 93b, a higher clamping force and vice versa.
  • the adjusting screws 25a and 25b move downwards and take the prestressing members 91a and 91b with them.
  • transverse bores are introduced into the pivot pins 140 a and 140 b, in which the screw heads can dip, as in Fig. 4 shown.
  • the adjustment takes place in the tightening state, as in Fig. 4 represented, for example by means of a torque wrench, the plug-in attachment is inserted from below into the hexagon socket of the screw heads and removed after adjustment.
  • a helical spring 26a and 26b is respectively disposed around the shank of the adjusting screws 25a and 25b.
  • These springs 26a and 26b serve the spacing of the clamping members 91 a and 91 b to the crank head pins 160a and 160b, which ensures that the screw heads of the screws 25a and 25b always abut with their underside on the crankpins 160a and 160b.
  • the springs 26a and 26b further prevent undesired adjustment of the adjusting screws 25a and 25b, as well as undesirable sagging of the clamping hooks 93a and 93b in the non-tensioned or released state.
  • crank head pins 160a and 160b of the crank head bearings 16a and 16b are realized by one-piece hinge pins, on each of which on both sides of the crank arms 17a and 18a and 17b and 18b are articulated.
  • the thrust crank bearings 15a and 15b are each realized by two mutually aligned hinge pins 150a and 151a and 150b and 151b.
  • the quick-release device 1 to an imaginary vertically extending centerline is constructed substantially mirror-symmetrical, with the exception of the device 20, which is used to align a tool to be clamped relative to the quick release device 1 and thus relative to the machine, as explained in more detail below.
  • the quick release device 1 comprises a device designated 20, which is used during tool changing for aligning the installed and subsequently to exciting tool.
  • a plurality of such devices 20 may be provided.
  • the device 20 comprises a plan view wedge-shaped investment block 201, the position of which can be changed by adapting the gap 202, for example by introducing different spacer plates.
  • the tool to be installed can align itself by contact with the contact block 201.
  • This alignment succeeds particularly well when several quick-release devices 1 with such a device 20 are included on the machine, which cooperatively form, for example, a V-shaped receptacle into which the tool to be installed can be inserted and hereby aligns itself almost automatically.
  • a tool to be installed comprises at least one device cooperating with the device 20.
  • the force-loaded components of the quick-release device 1 according to the invention are preferably formed from a metal material.
  • Other components may also be formed, for example, from a plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
EP10162011.0A 2009-05-30 2010-05-05 Dispositif de serrage rapide doté d'une force de serrage réglable Withdrawn EP2258517A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009023533A DE102009023533A1 (de) 2009-05-30 2009-05-30 Schnellspannvorrichtung mit einstellbarer Spannkraft

Publications (2)

Publication Number Publication Date
EP2258517A2 true EP2258517A2 (fr) 2010-12-08
EP2258517A3 EP2258517A3 (fr) 2014-05-07

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Application Number Title Priority Date Filing Date
EP10162011.0A Withdrawn EP2258517A3 (fr) 2009-05-30 2010-05-05 Dispositif de serrage rapide doté d'une force de serrage réglable

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EP (1) EP2258517A3 (fr)
DE (1) DE102009023533A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011106409U1 (de) 2011-09-29 2011-11-22 Hohenstein Vorrichtungsbau Und Spannsysteme Gmbh Spannkassette mit Niederzugspanner
DE102023003583A1 (de) 2023-09-01 2024-06-27 Mercedes-Benz Group AG Niederhalter zum Anpressen zweier miteinander zu verschweißender Bauelemente sowie Schweißvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE914807C (de) 1951-11-27 1954-07-08 Licentia Gmbh Kombinierte Exzenter-Kniehebel-Schnellspannvorrichtung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103074A (en) * 1936-03-09 1937-12-21 Whitney Metal Tool Company Clamping device
US2651959A (en) * 1951-10-19 1953-09-15 Donald K Harrington Sliding jaw vise, including a presettable, lever-actuated, jaw locking means
US5772193A (en) * 1996-09-03 1998-06-30 Delaware Capital Formation, Inc. Double supported plunger clamp
US6315278B1 (en) * 2000-01-14 2001-11-13 Grip-On Tools, S.A. Compact clamp
DE10324272B3 (de) * 2003-05-28 2005-03-03 Daimlerchrysler Ag Werkstückgreifvorrichtung und entsprechend ausgestattete Werkzeugmaschine
DE20312401U1 (de) * 2003-08-07 2004-12-23 Kuka Schweissanlagen Gmbh Spanneinrichtung
DE102004007346B3 (de) * 2003-11-04 2005-04-21 Tünkers Maschinenbau Gmbh Kniehebelspannvorrichtung - auch Spannwerkzeug wie Punktschweißvorrichtung mit Kniehebelgelenkanordnung, oder Clinchwerkzeug mit Kniehebelgelenkanordnung oder dergleichen -, zur Verwendung im Karosseriebau der Kfz-Industrie
DE102007034080A1 (de) * 2007-07-21 2009-01-22 De-Sta-Co Europe Gmbh Schubstangenspannvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE914807C (de) 1951-11-27 1954-07-08 Licentia Gmbh Kombinierte Exzenter-Kniehebel-Schnellspannvorrichtung

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Publication number Publication date
DE102009023533A1 (de) 2010-12-02
EP2258517A3 (fr) 2014-05-07

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