EP0419441B1 - Apparatus for bending concrete reinforcing bars - Google Patents

Apparatus for bending concrete reinforcing bars Download PDF

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Publication number
EP0419441B1
EP0419441B1 EP90890230A EP90890230A EP0419441B1 EP 0419441 B1 EP0419441 B1 EP 0419441B1 EP 90890230 A EP90890230 A EP 90890230A EP 90890230 A EP90890230 A EP 90890230A EP 0419441 B1 EP0419441 B1 EP 0419441B1
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EP
European Patent Office
Prior art keywords
bars
bending
gripper
arm
gripper tongs
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
EP90890230A
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German (de)
French (fr)
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EP0419441A1 (en
Inventor
Klaus Dipl.-Ing. Ritter
Gerhard Dr. Dipl.-Chem. Ritter
Gerhard Dipl.-Ing. Schmidt
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EVG Entwicklungs und Verwertungs GmbH
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EVG Entwicklungs und Verwertungs GmbH
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Filing date
Publication date
Priority claimed from AT220689A external-priority patent/AT393641B/en
Priority claimed from AT27990A external-priority patent/AT394958B/en
Application filed by EVG Entwicklungs und Verwertungs GmbH filed Critical EVG Entwicklungs und Verwertungs GmbH
Publication of EP0419441A1 publication Critical patent/EP0419441A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28—Associations of cutting devices therewith
    • B21D43/285—Devices for handling elongated articles, e.g. bars, tubes or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles

Definitions

  • the invention relates to a device for bending steel bars to concrete reinforcement elements, with a device for feeding bars to a transfer device with which a family of bars can be inserted in the transverse direction of the bar between bending members.
  • coulter bars combined on stops on an inclined plane are fed one after the other in the transverse direction of the bar to the transfer device, which coulters with bars lying vertically one above the other on a roller conveyor in the longitudinal direction of a downstream binding device for tying the coulter and a bending machine in which the coulter is bent into the desired shape.
  • the main disadvantage of this device is that the coulters are passed without guidance to the transfer device having several rows of vertical pairs of rollers, which can lead to malfunctions and misalignments of the bars.
  • Another disadvantage of the known design is that the coulters are first wrapped with tapes or wire or bound to one another by welding so that they can subsequently be fed to the bending device in the longitudinal direction.
  • DE-A-36 44 482 discloses a device of the type mentioned at the outset for machining steel bars with a tool, for example a bending slide, in which several bars are transported both towards the bending slide and after processing away from the slide in the transverse direction of the bar by means of arms which are mounted on both sides of the tool and can be pivoted as a unit.
  • the rods must be placed on the swivel arms by hand.
  • a further disadvantage is that the rods are not fixed on the swivel arms and are only held by one step in the respective swivel arm when the arms are swiveled.
  • Another disadvantage is that the bars to be bent are placed on inclined, ramp-shaped elements and after lowering the swivel arms only due to gravity Cross bar direction slipped into a working channel of the bending device.
  • a mutual hindrance when slipping can take place, in particular if the rods are long and ribbed, and a defined, ordered arrangement in the working channel can thereby be made more difficult.
  • the object of the invention is to provide a device which avoids the disadvantages of the known devices and ensures a safe simultaneous transfer of a group of bars from the feed device to the bending device.
  • the device is intended to enable the perfect processing of rod material in different shapes.
  • This object is achieved in the generic device in that two mutually adjustable frames in the longitudinal direction relative to each other are provided, which are each equipped with a set of bending members and controlled gripping pliers as a transfer device, which from a receiving position in which they the rod feeder take up several rods and clamp them, can be pivoted in the transverse direction of the rod into a delivery position in which they insert the rods into the space between the bending members.
  • GB-A-2 026 361 discloses a pipe bending system with a single bending table, in which a swivel arm arranged between the pipe feeding device and the bending table grips a pipe placed by the feeding device on an intermediate shelf, lifts it by 180 ° rotates and inserts in the tube transverse direction between the bending jaws of the bending table, after which a clamping sleeve engaging on one tube end moves the tube in the tube longitudinal direction through the bending jaws.
  • At least one of the gripping tongs can be controlled in the closing direction for clamping the bars during the bending process and / or in the opening direction during the adjustment of the frames.
  • the transfer device has a separate actuating device for each gripper and each gripper is in turn equipped with a separate actuating device for the controlled opening and closing thereof. This ensures safe guiding and transfer of the rods during all phases of the operation of the device.
  • each gripper is arranged at the end of a controlled telescopically adjustable swivel arm which is articulated on the inside of the corresponding frame.
  • the jaws of the gripping pliers are expediently pivoted together in the form of a gripping pliers head on the swivel arm. This improves the accuracy of the pick-up and transfer of the bars.
  • each gripping tongs has a clamping arm and a clamping lever which can be pivoted against it, which are articulated to one another by means of a bearing pin and can be moved relative to and away from one another by means of a drive device acting on both parts, and that the transfer device acts as an actuating device for each gripping pliers has a drivable eccentric crank which carries the bearing journal, is mounted on the inside of the frame, has a separately drivable swivel arm which is concentric with it and which is mounted on the inside of the frame, and a tab connecting the swivel arm to the clamping arm.
  • the racks in the region of the receiving position of their gripping tongs are assigned a run-up surface for rods fed in by the rod feed device in the transverse direction of the rod and the run-up surface has an alignment device for mutually aligning one end of the rods.
  • the rod feeder has advantageously above the run-up surfaces, a rod ejection device, with which rods can be fed individually one after the other to the run-up surfaces.
  • the rod feed device can also have parallel, endlessly rotating conveyor units between which the gripping tongs engage in their receiving position.
  • a discharge device for the rods is advantageously arranged above the inlet end of the conveyor units, which has at least one swivel channel for the discharge of one rod each, a distribution flap or the like preferably being located between the discharge device and the conveyor units. is provided for transferring the rod to or away from the conveyor units.
  • the gripping tongs are arranged in their receiving position in the region of the outlet end of an endless rotating conveyor element of the rod feed device.
  • the bending device 1 shown in Fig. 1 has two mutually spaced bending frames 2, 2 'for the simultaneous bending of several bars S.
  • a bar feed device with a bar ejection device 3 which, from a lateral feed device 4 bars S individually in the direction of the arrow P 1, i.e. in the longitudinal direction.
  • the schematically illustrated feed device 4 is suitable for feeding straightened, straight rods in standard lengths and is equipped with feed rollers (not shown), a length measuring device and scissors.
  • the feed device 4 can be preceded by a straightening device, so that rod material coming from drums or reels can also be processed. If the rod material is already in the required final production length, the length measuring device and the scissors are not required or out of operation.
  • the rod ejection device 3 has at least one pivotable discharge chute 5. After pivoting the discharge channel 5, the rod S falls in the direction of arrow P3 on an inclined ramp and sliding plate 7 at the top of the bending frames 2, 2 'and rolls into a transfer device 8 in the receiving position for several rods, the two pivot arms 9 and associated gripper head 10.
  • Each swivel arm 9 is pivotally mounted on the inside of one of the bending frames 2 and 2 'and according to the arrow P4 from the rod receiving position into a Bendable position.
  • the bending position is defined by the position of a bending mandrel 11 and bending pin 12 existing bending head 13 or 13 ', which in each of the bending frames 2 and 2' is suitably lowered and controlled operable. In an alternative embodiment, only the bending pin 12 can be lowered.
  • Each swivel arm 9 is divided into two parts and with its upper part carrying the gripping pliers head 10 is telescopically height-adjustable in relation to the lower part mounted on the bending frame in accordance with the double arrow P5 in order to be able to insert the rods into the bending position between the bending mandrel 11 and the bending pin 12 of the bending head 13.
  • the gripper head 10 is pivotally attached to the upper part of the swivel arm 9 in accordance with the double arrow P6 in order to be able to be positioned exactly in the receiving position and to be able to pass the rods S to the bending heads 13, 13 'of the bending frames 2, 2' exactly.
  • the gripper head 10 is provided with a lower jaw 14 'and with a pivotable according to the double arrow P7 upper jaw 14 ⁇ , which are able to move the rods S during the pivoting movement P4 of the swivel arm 9 from the receiving position into the bending position and also during the To hold on to bending. Furthermore, the rods S, which are held by the pliers jaws 14 ', 14', can be lifted out of the bending position so far with the help of the swivel arms 9 when changing the position of the bending tools that the bending direction needs to be changed, so that a lowering of the bending head or one of the Bending tools are not required.
  • the gripping tongs for transferring the rods from one side of the central bending mandrel 11 to the other side thereof are controlled accordingly.
  • the gripper jaw 14 ⁇ before the pivoting movement P4 of the swivel arm 9 can be folded back into the receiving position to such an extent that the jaw 14 ⁇ does not collide with the bars in the bending heads 13, 13 '.
  • the bending members 11, 12 bearing bending heads 13, 13 ' are according to the double arrow P21, ie in Rod longitudinal direction in the respective bending frames 2 and 2 'slidably arranged.
  • the bending members 11, 12 are each displaceable relative to the gripping pliers 10, so that the bending of a desired arc with a radius larger than the radius of curvature of the central bending mandrel 11 is possible by dividing the total bending into several successive partial bends.
  • the nominal curve is divided into several partial sections and the total bending angle into several partial bending angles, whereby a step-by-step displacement of the bending members 11, 12 relative to the gripping tongs 10 which clamp the rod material alternates with a partial bending by the partial bending angle until the desired nominal curve is completed.
  • the gripper head 10 After the gripper head 10 is filled with a predetermined number of rods S, these are fixed with the aid of the jaw 14 ⁇ . Before being fixed in the pliers head 10, the rods S are aligned against a stationary stop 15 'with the aid of an extendable aligning device 15 arranged on a stationary component, not shown.
  • the alignment device 15 is provided with a corresponding to the double arrow P8 stop part 15 '.
  • the bending frames 2, 2 'of the bending device 1 can be moved according to the double arrow P9 on only schematically indicated rails 16 in order to be able to bend the bars according to the reinforcement stirrups to be produced at different bending points.
  • the rods are held by one of the frames by means of the gripping pliers 10.
  • the gripping tongs 10 of the other frame are actuated to guide the bars arranged one above the other when the racks are adjusted in the sense of slightly opening the tongs in order to enable the bars to slide in the gripping jaws without changing the bar arrangement.
  • the bending device 1 is provided with a correspondingly shaped, fixed support plate 17 ⁇ , with the support surfaces 17, 17 'on the bending frames 2, 2' serves as a cover plate for the discharge device 3.
  • the support plate 17 ⁇ can also be formed in two parts, in which case each part is connected to a bending frame 2 or 2 'and is displaceable with this.
  • Fig. 1 shows, it is possible within the scope of the invention, with the help of an arranged on the rear of the bending device 1 additional rod feeder 18 rods S in the transverse direction thereof according to the arrow P10, preferably horizontally, the ramp plate 7 and thus the Feed over device 8.
  • the rod feed device 18 suitably consists of one or more parallel endless conveyor belts 19 which are guided at one end by rollers 21 rotating in the direction of the double arrow P 1 and driven by a device, not shown.
  • FIG. 2 shows a further exemplary embodiment of a device according to the invention.
  • the rods S are fed to a discharge and distribution device 22, which essentially corresponds to the discharge device 3 according to FIG. 1, via a feed device 4 according to FIG. 1, which, as in the exemplary embodiment according to FIG. 1, loads with different forms of rod material can be.
  • the rod ejection device 22 has at least one pivotable discharge channel 5, which is arranged on a channel support 6 and can be pivoted in accordance with the double arrow P2. Below the rod ejection device 22 is connected to a lateral, in the longitudinal direction of the bars guide plates 23 provided discharge channel 24, which guides the rods S in the direction of arrow P3 to a pivotable according to the double arrow P12 distribution flap 25.
  • the rods S can either be passed through an inclined baffle 26 above the rod feeder 18 in the direction of arrow P13 to the rod feeder 18 or, alternatively, via another rod baffle 18 pointing away, also inclined baffle 27 in the direction the arrow P14 a filing and intermediate magazine, not shown become.
  • This form of the ejection and distribution device is particularly advantageous for the removal of non-convertible remaining lengths, and is particularly intended for the case in which the higher working speed of the ejection and distribution device 22 is to be fully utilized compared to the relatively slow production speed of the bending device, in order to ensure continuous operation to guarantee.
  • the rods S are conveyed with the help of the rod feed device 18 in the direction of arrow P10 into the gripping pliers heads 10 of the transfer device 8 which, according to FIG. 2, engage in their first position between the parallel, endlessly rotating conveyor units of the rod feed device.
  • the pliers jaws 14 ⁇ close, if necessary only after an alignment device (not shown in FIG. 2) has aligned the ends of the rods, and the swivel arms 9 pivot from the receiving position into the bending position.
  • the drive and actuating elements necessary for the movement of the individual devices are designed in a known manner and are omitted in FIGS. 1 and 2 for the sake of clarity.
  • the gripping tongs could also engage before the end of the drain or below instead of in the receiving position between parallel conveyor units of the rod feed device 18 the end of the conveyor units or a single endlessly rotating conveyor element.
  • FIG. 3 An alternative embodiment of the transfer device 8 'has two gripping tongs 28, which are each designed according to FIG. 3, in which a view of the inside of the bending frame 2 is shown.
  • the gripping pliers 28 has an angled clamping arm 29 and a likewise angled clamping lever 30, which is formed from a short lever arm 30 'and a long lever arm 30'.
  • the clamping arm 29 is pivotally mounted at one end and the clamping lever 30 at its bending point on a common, eccentrically arranged bearing journal 31 of an eccentric crank 32, which is only indicated by a broken line.
  • a hydraulically actuated working cylinder 33 is mounted as the drive device, the piston rod 34 of which is articulated on the short lever arm 30 'of the clamping lever 30.
  • the piston rod 34 By actuating the drive device 33, the piston rod 34 performs a linear movement corresponding to the double arrow P16, so that the clamping lever 30 is pivoted relative to the clamping arm 29 according to the double arrow P17, whereby the rods S between the jaws 35 at the free end of the clamping arm 29 and the lever arm 30th ⁇ be clamped.
  • the clamping jaws 35 which are parallel to one another in the closed position, consist of flexible, wear-resistant material as possible, so that several rods S can be securely clamped even when the clamping jaws are not completely parallel and in the event of fluctuations in the diameter of the individual rods.
  • the eccentric crank 32 forming the swivel arm for the gripping tongs is mounted with its swivel axis 36, which lies on the axis XX of the central bending mandrel 11, on the inside of the respective bending frame 2 or 2 'and performs a swiveling movement accordingly under the action of a drive device, not shown the double arrow P18.
  • Concentric to the pivot axis 36 of the eccentric crank 32 is also a pivot arm 37 on the Inside of the respective bending frame 2 or 2 'pivotally mounted, which performs a pivoting movement according to the double arrow P1 under under the action of a further drive device, also not shown.
  • the mounting of the swivel arm 37 can be formed, for example, by a hollow shaft, not shown, in which the eccentric crank 32 is in turn mounted concentrically.
  • the free end of the swivel arm 37 is coupled to the clamping arm 29 via a connecting link 38, the articulation point being as close as possible to the free end of the clamping arm 29.
  • the connecting strap 38 forces the movements of the clamping arm 29 and the clamping lever 30 to be coupled.
  • the transfer device described above works as follows:
  • the rods S pass via a baffle and sliding plate 7 designed in accordance with the exemplary embodiment according to FIG. 1 into a collecting device 39, which is only indicated schematically and is arranged on a stationary component of the device, not shown.
  • the collecting device 39 preferably has a U-shaped cross section and a depth such that all the rods to be bent at the same time can be arranged in the correct position one above the other and can be picked up by the gripping pliers 28.
  • a side wall 40 of the collecting device 39 can optionally be designed to be displaceable parallel to the opposite side wall.
  • the gripping pliers 28 are pivoted into the receiving position defined by the collecting device 39 by actuating the eccentric crank 32 and the swivel arm 37 in accordance with the double arrow P20.
  • the clamping lever 30 pivots according to the double arrow P17 against the clamping arm 29, so that all the rods between the clamping jaws 35 are securely clamped.
  • rods are aligned at the end with an alignment device, not shown in FIG. 3, described with reference to FIG. 1.
  • the rods are held by means of the gripping pliers 28 of one of the bending frames, whereas the gripping pliers 28 of the other bending frame are opened slightly to guide the superimposed rods to prevent the rods from sliding between the clamping jaws 35 Allow changing the rod arrangement.
  • the eccentric crank 32 is actuated and the pivot arm 37 is pivoted such that the clamping arm is raised together in accordance with the double arrow P5 and the rods held by the closed gripping tongs 28 29 and the clamping lever 30 lifted out of the bending position, then by jointly pivoting the clamping arm 29 and the clamping lever 30 according to the double arrow P20 transferred from one side of the central mandrel 11 to the other side of the same and finally, after a change in position of the bending pin 12 by lowering them together the clamping arm 29 and the clamping lever 30 are lowered in accordance with the double arrow P5 in the new bending position.
  • the eccentric crank 32 and the swivel arm 37 are coordinated in their movements so that the superimposed rods during the transfer movements always stay parallel to the central mandrel 11.
  • the eccentric crank 32 and the swivel arm 37 are actuated again, so that the bars are lifted out of the bending position when the gripper 28 is closed by lifting the clamping arm 29 and the clamping lever 30 together according to the double arrow P Doppel.
  • the rods are pivoted by jointly pivoting the clamping arm 29 and the clamping lever 30 according to the double arrow P20 from the area of the bearing surface 17 of the bending frame 2 and finally by lowering the clamping arm 29 and the clamping lever 30 together and after opening the gripping pliers 28 with the aid of the clamping drive device 33 placed on a preferably inclined drain plate 41.
  • the transfer device 8 'according to FIG. 3 and the illustrated collecting device can also be used in the embodiment shown in FIG. 2.
  • the swivel arms 9 and the gripping tongs 10 for transferring the rods from one side of the central bending mandrel 11 to the other side thereof are actuated, as in the exemplary embodiment according to FIG. Furthermore, these swivel arms and gripping tongs are actuated to lift and eject the bars after all bending processes have been completed.
  • control device To control the controllable, movable devices and to coordinate the movements of these devices with each other, as well as to control and monitor the bar transport from the feeders to the bending device, in particular for the individual control of the swivel arms and gripping tongs, and to carry out the required bends on the bars a control device, not shown, is provided with which the drive and actuating elements are controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Clamps And Clips (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

PCT No. PCT/AT90/00076 Sec. 371 Date May 15, 1991 Sec. 102(e) Date May 15, 1991 PCT Filed Jul. 30, 1990 PCT Pub. No. WO91/04113 PCT Pub. Date Apr. 4, 1991.Apparatus for bending steel bars to form concrete reinforcement elements, having a device (3, 4; 18) for feeding bars to a transfer device (8), by means of which in each case one group of bars can be inserted in two bending frames or stations, (2, 2'), each having members (11, 12) for bending the bars in transverse direction the transfer device having at least one pair of operation-controlled gripper tongs (10) which can be swivelled from a first position, in which they receive a plurality of bars from the bar feed device, and clamp the bars, into a second position, in which they insert the bars into the gap between the bending members.

Description

Die Erfindung betrifft eine Vorrichtung zum Biegen von Stahlstäben zu Betonbewehrungselementen, mit einer Einrichtung zum Zuführen von Stäben zu einer Überführeinrichtung, mit der jeweils eine Stabschar in Stabquerrichtung zwischen Biegeorgane einführbar ist.The invention relates to a device for bending steel bars to concrete reinforcement elements, with a device for feeding bars to a transfer device with which a family of bars can be inserted in the transverse direction of the bar between bending members.

Bei einer aus der DE-A-30 10 923 bekannten Vorrichtung dieser Art werden auf einer Schrägebene mittels Anschlägen zusammengefaßte Stabscharen nacheinander in Stabquerrichtung der Überführeinrichtung zugeführt, welche die Scharen mit vertikal übereinanderliegenden Stäben auf einem Rollengang in Stablängsrichtung einer nachgeschalteten Bindeeinrichtung zum Abbinden der Schar sowie einer Biegemaschine zuführt, in welcher die Schar in die gewünschte Gestalt gebogen wird. Der wesentliche Nachteil dieser Vorrichtung besteht darin, daß die Stabscharen ohne Führung an die mehrere Reihen von senkrecht stehenden Walzenpaaren aufweisende Überführeinrichtung übergeben werden, was zu Störungen und Fehlausrichtungen der Stäbe führen kann. Nachteilig ist bei der bekannten Ausführung außerdem, daß die Stabscharen zuerst mit Bändern oder Draht umwickelt oder durch Schweißen aneinander gebunden werden müssen, damit sie anschließend in Längsrichtung der Biegeeinrichtung zugeführt werden können.In a device of this type known from DE-A-30 10 923, coulter bars combined on stops on an inclined plane are fed one after the other in the transverse direction of the bar to the transfer device, which coulters with bars lying vertically one above the other on a roller conveyor in the longitudinal direction of a downstream binding device for tying the coulter and a bending machine in which the coulter is bent into the desired shape. The main disadvantage of this device is that the coulters are passed without guidance to the transfer device having several rows of vertical pairs of rollers, which can lead to malfunctions and misalignments of the bars. Another disadvantage of the known design is that the coulters are first wrapped with tapes or wire or bound to one another by welding so that they can subsequently be fed to the bending device in the longitudinal direction.

Die DE-A-36 44 482 offenbart eine Vorrichtung der eingangs genannten Art zum Bearbeiten von Stahlstäben mit einem Werkzeug, z.B. einem Biegeschlitten, bei welcher jeweils mehrere Stäbe sowohl zum Biegeschlitten hin als auch nach der Bearbeitung vom Schlitten weg in Stabquerrichtung mittels Armen transportiert werden, die zu beiden Seiten des Werkzeuges gelagert und als Einheit verschwenkbar sind. Bei dieser Konstruktion müssen die Stäbe von Hand auf die Schwenkarme aufgelegt werden. Nachteilig ist ferner, daß die Stäbe auf den Schwenkarmen nicht fixiert sind und beim Schwenken der Arme nur durch eine Stufe im jeweiligen Schwenkarm gehalten werden. Als weiterer Nachteil ergibt sich, daß die zu biegenden Stäbe auf geneigten, rampenförmigen Elementen abgelegt werden und nach dem Absenken der Schwenkarme nur auf Grund der Schwerkraft in Stabquerrichtung in einen Arbeitskanal der Biegeeinrichtung rutschten. Infolge des gleichzeitigen Zuführens mehrerer Stäbe kann dabei, insbesondere wenn die Stäbe lang und gerippt sind, eine gegenseitige Behinderung beim Abrutschen stattfinden und dadurch eine definierte geordnete Anordnung im Arbeitskanal erschwert werden.DE-A-36 44 482 discloses a device of the type mentioned at the outset for machining steel bars with a tool, for example a bending slide, in which several bars are transported both towards the bending slide and after processing away from the slide in the transverse direction of the bar by means of arms which are mounted on both sides of the tool and can be pivoted as a unit. With this construction, the rods must be placed on the swivel arms by hand. A further disadvantage is that the rods are not fixed on the swivel arms and are only held by one step in the respective swivel arm when the arms are swiveled. Another disadvantage is that the bars to be bent are placed on inclined, ramp-shaped elements and after lowering the swivel arms only due to gravity Cross bar direction slipped into a working channel of the bending device. As a result of the simultaneous feeding of a plurality of rods, a mutual hindrance when slipping can take place, in particular if the rods are long and ribbed, and a defined, ordered arrangement in the working channel can thereby be made more difficult.

Aufgabe der Erfindung ist es, eine Vorrichtung zu schaffen, welche die Nachteile der bekannten Vorrichtungen vermeidet und ein sicheres gleichzeitiges Überführen einer Schar von Stäben von der Zuführeinrichtung zur Biegeeinrichtung gewährleistet. Die Vorrichtung soll zugleich die einwandfreie Bearbeitung von in unterschiedlichen Formen vorliegendem Stabmaterial ermöglichen. Diese Aufgabe wird bei der gattungsgemäßen Vorrichtung dadurch gelöst, daß zwei mit gegenseitigem Abstand in Stablängsrichtung relativ zueinander verstellbare Gestelle vorgesehen sind, die je mit einem Satz von Biegeorganen und mit gesteuert betätigbaren Greifzangen als Überführeinrichtung ausgestattet sind, welche aus einer Aufnahmestellung, in der sie von der Stabzuführeinrichtung mehrere Stäbe aufnehmen und diese festklemmen, in Stabquerrichtung in eine Abgabestellung verschwenkbar sind, in welcher sie die Stäbe in den Zwischenraum zwischen den Biegeorganen einführen.The object of the invention is to provide a device which avoids the disadvantages of the known devices and ensures a safe simultaneous transfer of a group of bars from the feed device to the bending device. At the same time, the device is intended to enable the perfect processing of rod material in different shapes. This object is achieved in the generic device in that two mutually adjustable frames in the longitudinal direction relative to each other are provided, which are each equipped with a set of bending members and controlled gripping pliers as a transfer device, which from a receiving position in which they the rod feeder take up several rods and clamp them, can be pivoted in the transverse direction of the rod into a delivery position in which they insert the rods into the space between the bending members.

Mit dieser Ausbildung wird eine sichere Aufnahme einer Schar von Stäben erreicht, die bis zu ihrer Ablage zwischen den Biegeorganen und gegebenenfalls auch beim Biegevorgang festgehalten wird, so daß die Stäbe ihre gegenseitige Relativlage nicht ändern können.With this training a safe reception of a group of bars is achieved, which is held until it is deposited between the bending members and possibly also during the bending process, so that the bars can not change their relative position.

Es sei erwähnt, daß aus der GB-A-2 026 361 eine Rohrbiegeanlage mit einem einzigen Biegetisch bekannt ist, bei der ein zwischen Rohr-Zuführeinrichtung und Biegetisch angeordneter Schwenkarm ein von der Zuführeinrichtung auf eine Zwischenablage abgelegtes Rohr ergreift, anhebt, um 180° dreht und in Rohrquerrichtung zwischen die Biegebacken des Biegetisches einlegt, wonach eine an einem Rohrende angreifende Klemmhülse das Rohr in Rohrlängsrichtung durch die Biegebacken bewegt.It should be mentioned that GB-A-2 026 361 discloses a pipe bending system with a single bending table, in which a swivel arm arranged between the pipe feeding device and the bending table grips a pipe placed by the feeding device on an intermediate shelf, lifts it by 180 ° rotates and inserts in the tube transverse direction between the bending jaws of the bending table, after which a clamping sleeve engaging on one tube end moves the tube in the tube longitudinal direction through the bending jaws.

Ferner ist aus der DE-A-33 41 714 eine Anlage zum Biegen von Betonbewehrungsstahlstäben mit zwei Biegetischen bekannt, von denen der eine in Stablängsrichtung verschiebbar gelagert ist, einerseits um eine Längsbewegung des Stabes beim Umbiegen eines Endes auszugleichen, wenn das andere, bereits umgebogene Ende im anderen Biegetisch festsitzt, und anderseits um den gebogenen Stab zum Auswerfen freizugeben.Furthermore, from DE-A-33 41 714 a system for bending concrete reinforcing steel bars with two bending tables is known, one of which is slidably mounted in the longitudinal direction of the bar, on the one hand by a longitudinal movement of the bar when bending to compensate for one end when the other, already bent end is stuck in the other bending table, and on the other hand to release the bent rod for ejection.

Gemäß einer Ausführungsform der Erfindung ist zumindest eine der Greifzangen im Schließsinn zum Festklemmen der Stäbe während des Biegevorganges und/oder im Öffnungssinn während des Verstellens der Gestelle ansteuerbar.According to one embodiment of the invention, at least one of the gripping tongs can be controlled in the closing direction for clamping the bars during the bending process and / or in the opening direction during the adjustment of the frames.

Gemäß einer Weiterbildung der Erfindung ist vorgesehen, daß die Überführeinrichtung eine gesonderte Betätigungseinrichtung für jede Greifzange aufweist und jede Greifzange ihrerseits zum gesteuerten Öffnen und Schließen derselben mit einer gesonderten Betätigungseinrichtung ausgestattet ist. Hiedurch wird eine sichere Führung und Überführung der Stäbe während aller Phasen des Betriebes der Vorrichtung gewährleistet.According to a development of the invention, it is provided that the transfer device has a separate actuating device for each gripper and each gripper is in turn equipped with a separate actuating device for the controlled opening and closing thereof. This ensures safe guiding and transfer of the rods during all phases of the operation of the device.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist jede Greifzange am Ende eines gesteuert teleskopartig verstellbaren Schwenkarmes angeordnet, der an der Innenseite des entsprechenden Gestells angelenkt ist. Dabei sind zweckmäßig die Zangenbacken der Greifzange in Form eines Greifzangenkopfes am Schwenkarm gemeinsam verschwenkbar gelagert. Hiedurch wird die Genauigkeit der Aufnahme und Übergabe der Stäbe verbessert.According to a preferred embodiment of the invention, each gripper is arranged at the end of a controlled telescopically adjustable swivel arm which is articulated on the inside of the corresponding frame. The jaws of the gripping pliers are expediently pivoted together in the form of a gripping pliers head on the swivel arm. This improves the accuracy of the pick-up and transfer of the bars.

Eine alternative Ausführungsform der Greifzangengestaltung besteht darin, daß jede Greifzange einen Klemmarm und einen gegen diesen verschwenkbaren Klemmhebel aufweist, die mittels eines Lagerzapfens aneinander angelenkt und mittels einer an beiden Teilen angreifenden Antriebseinrichtung relativ gegeneinander und voneinander weg bewegbar sind, und daß die Überführeinrichtung als Betätigungseinrichtung für jede Greifzange eine den Lagerzapfen tragende, an der Innenseite des Gestells gelagerte, antreibbare Exzenterkurbel, einen zu dieser konzentrischen, an der Innenseite des Gestells gelagerten, getrennt antreibbaren Schwenkarm sowie eine den Schwenkarm mit dem Klemmarm verbindende Lasche aufweist.An alternative embodiment of the gripping tongs design is that each gripping tongs has a clamping arm and a clamping lever which can be pivoted against it, which are articulated to one another by means of a bearing pin and can be moved relative to and away from one another by means of a drive device acting on both parts, and that the transfer device acts as an actuating device for each gripping pliers has a drivable eccentric crank which carries the bearing journal, is mounted on the inside of the frame, has a separately drivable swivel arm which is concentric with it and which is mounted on the inside of the frame, and a tab connecting the swivel arm to the clamping arm.

Bei allen Ausführungsformen der Erfindung ist es vorteilhaft, wenn den Gestellen im Bereich der Aufnahmestellung ihrer Greifzangen eine Auflauffläche für von der Stabzuführeinrichtung in Stabquerrichtung zugeführte Stäbe und der Auflauffläche eine Ausrichteinrichtung zum gegenseitigen Ausrichten des einen Endes der Stäbe zugeordnet ist. Dabei weist die Stabzuführeinrichtung vorteilhaft oberhalb der Auflaufflächen eine Stababwurfeinrichtung auf, mit welcher den Auflaufflächen Stäbe einzeln nacheinander zuführbar sind.In all embodiments of the invention, it is advantageous if the racks in the region of the receiving position of their gripping tongs are assigned a run-up surface for rods fed in by the rod feed device in the transverse direction of the rod and the run-up surface has an alignment device for mutually aligning one end of the rods. The rod feeder has advantageously above the run-up surfaces, a rod ejection device, with which rods can be fed individually one after the other to the run-up surfaces.

Gemäß einer alternativen Ausführungsform der Vorrichtung kann die Stabzuführeinrichtung auch parallele, endlos umlaufende Fördereinheiten aufweisen, zwischen welche die Greifzangen in ihrer Aufnahmestellung eingreifen. Dabei ist vorteilhaft oberhalb des Zulaufendes der Fördereinheiten eine Abwurfeinrichtung für die Stäbe angeordnet, die zumindest eine Schwenkrinne zum Abwerfen je eines Stabes aufweist, wobei zwischen der Abwurfeinrichtung und den Fördereinheiten vorzugsweise eine Verteilklappe od.dgl. zum Überleiten des Stabes auf die Fördereinheiten oder von diesen weg vorgesehen ist.According to an alternative embodiment of the device, the rod feed device can also have parallel, endlessly rotating conveyor units between which the gripping tongs engage in their receiving position. In this case, a discharge device for the rods is advantageously arranged above the inlet end of the conveyor units, which has at least one swivel channel for the discharge of one rod each, a distribution flap or the like preferably being located between the discharge device and the conveyor units. is provided for transferring the rod to or away from the conveyor units.

Bei einer weiteren Alternative der Stabzuführeinrichtung ist die Greifzange in ihrer Aufnahmestellung im Bereich des Ablaufendes eines endlosen umlaufenden Förderorganes der Stabzuführeinrichtung angeordnet.In a further alternative of the rod feed device, the gripping tongs are arranged in their receiving position in the region of the outlet end of an endless rotating conveyor element of the rod feed device.

Die Erfindung wird nachfolgend an Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen näher erläutert.

  • Fig. 1 zeigt in einer perspektivischen Ansicht schematisch eine Vorrichtung gemäß der Erfindung,
  • Fig. 2 schematisch ein weiteres Ausführungsbeispiel der Vorrichtung im Schnitt und
  • Fig. 3 in einer Detailansicht eine andere Ausführungsform der Vorrichtung.
The invention is explained in more detail below using exemplary embodiments with reference to the drawings.
  • 1 schematically shows a perspective view of a device according to the invention,
  • Fig. 2 shows schematically a further embodiment of the device in section and
  • Fig. 3 in a detailed view another embodiment of the device.

Die in Fig. 1 dargestellte Biegevorrichtung 1 weist zwei mit Abstand voneinander angeordnete Biegegestelle 2, 2′ zum gleichzeitigen Biegen mehrerer Stäbe S auf. Oberhalb der Biegevorrichtung 1 ist eine Stabzuführeinrichtung mit einer Stababwurfeinrichtung 3 vorgesehen, der von einer seitlichen Zuführeinrichtung 4 Stäbe S einzeln in Richtung des Pfeiles P₁, d.h. in Stablängsrichtung, zugeführt werden. Die schematisch dargestellte Zuführeinrichtung 4 eignet sich zum Zuführen von gerichteten, geraden Stäben in Standardlängen und ist mit nicht dargestellten Vorschubrollen, einer Längenmeßeinrichtung und einer Schere ausgestattet. Der Zuführeinrichtung 4 kann eine Richteinrichtung vorgeschaltet sein, so daß auch von Trommeln oder Haspeln kommendes Stabmaterial verarbeitet werden kann. Liegt das Stabmaterial bereits in der geforderten endgültigen Fertigungslänge vor, sind die Längenmeßeinrichtung und die Schere nicht erforderlich bzw. außer Betrieb.The bending device 1 shown in Fig. 1 has two mutually spaced bending frames 2, 2 'for the simultaneous bending of several bars S. Above the bending device 1 there is a bar feed device with a bar ejection device 3 which, from a lateral feed device 4 bars S individually in the direction of the arrow P 1, i.e. in the longitudinal direction. The schematically illustrated feed device 4 is suitable for feeding straightened, straight rods in standard lengths and is equipped with feed rollers (not shown), a length measuring device and scissors. The feed device 4 can be preceded by a straightening device, so that rod material coming from drums or reels can also be processed. If the rod material is already in the required final production length, the length measuring device and the scissors are not required or out of operation.

Die Stababwurfeinrichtung 3 weist zumindest eine schwenkbar angeordnete Abwurfrinne 5 auf. Nach dem Verschwenken der Abwurfrinne 5 fällt der Stab S in Richtung des Pfeiles P₃ auf ein geneigtes Auflauf- und Gleitblech 7 an der Oberseite der Biegegestelle 2, 2′ und rollt in eine sich in Aufnahmestellung für mehrere Stäbe befindliche Überführeinrichtung 8, die zwei Schwenkarme 9 und zugeordnete Greifzangenköpfe 10 aufweist.The rod ejection device 3 has at least one pivotable discharge chute 5. After pivoting the discharge channel 5, the rod S falls in the direction of arrow P₃ on an inclined ramp and sliding plate 7 at the top of the bending frames 2, 2 'and rolls into a transfer device 8 in the receiving position for several rods, the two pivot arms 9 and associated gripper head 10.

Jeder Schwenkarm 9 ist an der Innenseite eines der Biegegestelle 2 bzw. 2′ schwenkbar gelagert und entsprechend dem Pfeil P₄ aus der Stabaufnahmestellung in eine Biegestellung verschwenkbar. Die Biegestellung ist durch die Lage eines aus Biegedorn 11 und Biegebolzen 12 bestehenden Biegekopfes 13 bzw. 13′ definiert, der in jedem der Biegegestelle 2 bzw. 2′ zweckmäßig absenkbar und gesteuert betätigbar gelagert ist. Bei einer alternativen Ausführung ist lediglich der Biegebolzen 12 absenkbar.Each swivel arm 9 is pivotally mounted on the inside of one of the bending frames 2 and 2 'and according to the arrow P₄ from the rod receiving position into a Bendable position. The bending position is defined by the position of a bending mandrel 11 and bending pin 12 existing bending head 13 or 13 ', which in each of the bending frames 2 and 2' is suitably lowered and controlled operable. In an alternative embodiment, only the bending pin 12 can be lowered.

Jeder Schwenkarm 9 ist zweigeteilt und mit seinem den Greifzangenkopf 10 tragenden Oberteil gegenüber dem am Biegegestell gelagerten Unterteil entsprechend dem Doppelpfeil P₅ teleskopartig höhenverstellbar, um die Stäbe in die Biegestellung zwischen Biegedorn 11 und Biegebolzen 12 des Biegekopfes 13 einbringen zu können. Der Greifzangenkopf 10 ist am Oberteil des Schwenkarmes 9 entsprechend dem Doppelpfeil P₆ schwenkbar befestigt, um in der Aufnahmestellung genau positioniert werden zu können und um die Stäbe S den Biegeköpfen 13, 13′ der Biegegestelle 2, 2′ genau übergeben zu können. Der Greifzangenkopf 10 ist mit einer unteren Zangenbacke 14′ und mit einer entsprechend dem Doppelpfeil P₇ schwenkbaren oberen Zangenbacke 14˝ versehen, die in der Lage sind, die Stäbe S bei der Schwenkbewegung P₄ des Schwenkarmes 9 aus der Aufnahmestellung in die Biegestellung und auch während des Biegens festzuhalten. Ferner können die Stäbe S, die durch die Zangenbacken 14′, 14˝ festgehalten werden, mit Hilfe der Schwenkarme 9 bei dem zum Biegerichtungswechsel erforderlichen Positionswechsel der Biegewerkzeuge so weit aus der Biegestellung herausgehoben werden, daß für den Positionswechsel ein Absenken des Biegekopfes oder eines der Biegewerkzeuge nicht erforderlich ist. Vielmehr werden die Greifzangen zum Überführen der Stäbe von einer Seite des zentralen Biegedornes 11 auf die andere Seite desselben entsprechend angesteuert. Außerdem kann die Greifzangenbacke 14˝ vor der Schwenkbewegung P₄ des Schwenkarmes 9 zurück in die Aufnahmestellung soweit zurückgeklappt werden, daß die Zangenbacke 14˝ mit den Stäben in den Biegeköpfen 13, 13′ nicht kollidiert.Each swivel arm 9 is divided into two parts and with its upper part carrying the gripping pliers head 10 is telescopically height-adjustable in relation to the lower part mounted on the bending frame in accordance with the double arrow P₅ in order to be able to insert the rods into the bending position between the bending mandrel 11 and the bending pin 12 of the bending head 13. The gripper head 10 is pivotally attached to the upper part of the swivel arm 9 in accordance with the double arrow P₆ in order to be able to be positioned exactly in the receiving position and to be able to pass the rods S to the bending heads 13, 13 'of the bending frames 2, 2' exactly. The gripper head 10 is provided with a lower jaw 14 'and with a pivotable according to the double arrow P₇ upper jaw 14˝, which are able to move the rods S during the pivoting movement P₄ of the swivel arm 9 from the receiving position into the bending position and also during the To hold on to bending. Furthermore, the rods S, which are held by the pliers jaws 14 ', 14', can be lifted out of the bending position so far with the help of the swivel arms 9 when changing the position of the bending tools that the bending direction needs to be changed, so that a lowering of the bending head or one of the Bending tools are not required. Rather, the gripping tongs for transferring the rods from one side of the central bending mandrel 11 to the other side thereof are controlled accordingly. In addition, the gripper jaw 14˝ before the pivoting movement P₄ of the swivel arm 9 can be folded back into the receiving position to such an extent that the jaw 14˝ does not collide with the bars in the bending heads 13, 13 '.

Die die Biegeorgane 11, 12 tragenden Biegeköpfe 13, 13′ sind entsprechend dem Doppelpfeil P₂₁, d.h. in Stablängsrichtung in den jeweiligen Biegegestellen 2 bzw. 2′ verschiebbar angeordnet. Durch diese Anordnung sind die Biegeorgane 11, 12 jeweils relativ zur Greifzange 10 verschiebbar, so daß das Biegen eines Sollbogens mit einem Radius größer als der Krümmungsradius des zentralen Biegedornes 11 durch Aufteilung der Gesamtbiegung in mehrere nacheinander folgenden Teilbiegungen möglich wird. Dabei wird der Sollbogen in mehrere Teilabschnitte und der Gesamtbiegewinkel in mehrere Teilbiegewinkel aufgeteilt, wobei ein absatzweises Verschieben der Biegeorgane 11, 12 relativ zur das Stabmaterial festklemmenden Greifzange 10 entsprechend der Länge der Teilabschnitte so lange mit einer Teilbiegung um den Teilbiegewinkel abwechselt, bis der gewünschte Sollbogen vollendet ist.The bending members 11, 12 bearing bending heads 13, 13 'are according to the double arrow P₂₁, ie in Rod longitudinal direction in the respective bending frames 2 and 2 'slidably arranged. With this arrangement, the bending members 11, 12 are each displaceable relative to the gripping pliers 10, so that the bending of a desired arc with a radius larger than the radius of curvature of the central bending mandrel 11 is possible by dividing the total bending into several successive partial bends. The nominal curve is divided into several partial sections and the total bending angle into several partial bending angles, whereby a step-by-step displacement of the bending members 11, 12 relative to the gripping tongs 10 which clamp the rod material alternates with a partial bending by the partial bending angle until the desired nominal curve is completed.

Nachdem der Greifzangenkopf 10 mit einer vorbestimmten Anzahl von Stäben S gefüllt ist, werden diese mit Hilfe der Zangenbacke 14˝ fixiert. Die Stäbe S werden vor dem Festlegen im Zangenkopf 10 mit Hilfe einer an einem nicht gezeigten ortsfesten Bauteil angeordneten, ausfahrbaren Ausrichteinrichtung 15 gegen einen ortsfesten Anschlag 15˝ ausgerichtet. Die Ausrichteinrichtung 15 ist dazu mit einem entsprechend dem Doppelpfeil P₈ verschiebbaren Anschlagteil 15′ versehen. Die Biegegestelle 2, 2′ der Biegevorrichtung 1 sind entsprechend dem Doppelpfeil P₉ auf nur schematisch angedeuteten Schienen 16 verschiebbar, um die Stäbe entsprechend den herzustellenden Bewehrungsbügeln an verschiedenen Biegepunkten biegen zu können. Während des Verstellens der Biegegestelle werden die Stäbe mittels der Greifzange 10 eines der Gestelle festgehalten. Die Greifzange 10 des anderen Gestells wird dagegen zum Führen der übereinander angeordneten Stäbe beim Verstellen der Gestelle im Sinne eines geringfügigen Öffnens der Zange angesteuert, um ein Gleiten der Stäbe in den Greifbacken ohne Veränderung der Stabanordnung zu ermöglichen.After the gripper head 10 is filled with a predetermined number of rods S, these are fixed with the aid of the jaw 14˝. Before being fixed in the pliers head 10, the rods S are aligned against a stationary stop 15 'with the aid of an extendable aligning device 15 arranged on a stationary component, not shown. The alignment device 15 is provided with a corresponding to the double arrow P₈ stop part 15 '. The bending frames 2, 2 'of the bending device 1 can be moved according to the double arrow P₉ on only schematically indicated rails 16 in order to be able to bend the bars according to the reinforcement stirrups to be produced at different bending points. During the adjustment of the bending frames, the rods are held by one of the frames by means of the gripping pliers 10. The gripping tongs 10 of the other frame, on the other hand, are actuated to guide the bars arranged one above the other when the racks are adjusted in the sense of slightly opening the tongs in order to enable the bars to slide in the gripping jaws without changing the bar arrangement.

Zum sicheren Abstützen von Bügeln mit großen Schenkellängen ist die Biegevorrichtung 1 außer mit Auflageflächen 17, 17′ auf den Biegegestellen 2, 2′ mit einem entsprechend geformten ortsfesten Auflageblech 17˝ versehen, das gleichzeitig als Abdeckblech für die Abwurfeinrichtung 3 dient. Das Auflageblech 17˝ kann auch zweiteilig ausgebildet sein, wobei in diesem Fall jeder Teil mit einem Biegegestell 2 bzw. 2′ verbunden und mit diesem verschiebbar ist.To securely support stirrups with large leg lengths, the bending device 1 is provided with a correspondingly shaped, fixed support plate 17˝, with the support surfaces 17, 17 'on the bending frames 2, 2' serves as a cover plate for the discharge device 3. The support plate 17˝ can also be formed in two parts, in which case each part is connected to a bending frame 2 or 2 'and is displaceable with this.

Wie das in Fig. 1 dargestellte Ausführungsbeispiel zeigt, ist es im Rahmen der Erfindung möglich, mit Hilfe einer an der Hinterseite der Biegevorrichtung 1 angeordneten zusätzlichen Stabzuführeinrichtung 18 Stäbe S in deren Querrichtung entsprechend dem Pfeil P₁₀, vorzugsweise horizontal, dem Auflaufblech 7 und damit der Überführeinrichtung 8 zuzuführen. Die Stabzuführeinrichtung 18 besteht zweckmäßig aus einem oder mehreren parallelen endlosen Förderbändern 19, die an einem Ende um in Richtung des Doppelpfeiles P₁₁ umlaufende Rollen 21 geführt und mittels einer nicht gezeigten Einrichtung angetrieben sind.As the embodiment shown in Fig. 1 shows, it is possible within the scope of the invention, with the help of an arranged on the rear of the bending device 1 additional rod feeder 18 rods S in the transverse direction thereof according to the arrow P₁₀, preferably horizontally, the ramp plate 7 and thus the Feed over device 8. The rod feed device 18 suitably consists of one or more parallel endless conveyor belts 19 which are guided at one end by rollers 21 rotating in the direction of the double arrow P 1 and driven by a device, not shown.

In Fig. 2 ist ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung dargestellt. Bei dieser Vorrichtung werden die Stäbe S einer Abwurf- und Verteileinrichtung 22, welche im wesentlichen der Abwurfeinrichtung 3 gemäß Fig. 1 entspricht, über eine Zuführeinrichtung 4 gemäß Fig. 1 zugeführt, die wie beim Ausführungsbeispiel nach Fig. 1 mit verschiedenen Formen von Stabmaterial beschickt werden kann. Die Stababwurfeinrichtung 22 weist zumindest eine schwenkbare Abwurfrinne 5 auf, die an einem Rinnenträger 6 angeordnet und entsprechend dem doppelpfeil P₂ verschwenkbar ist. Unterhalb der Stababwurfeinrichtung 22 schließt ein mit seitlichen, in Längsrichtung der Stäbe verlaufenden Führungsblechen 23 versehener Abwurfkanal 24 an, der die Stäbe S in Richtung des Pfeiles P₃ zu einer entsprechend dem Doppelpfeil P₁₂ verschwenkbaren Verteilklappe 25 leitet. je nach der Stellung der Verteilklappe 25 können die Stäbe S entweder durch ein über der Stabzuführeinrichtung 18 angeordnetes, geneigtes Leitblech 26 in Richtung des Pfeiles P₁₃ an die Stabzuführeinrichtung 18 übergeben oder alternativ über ein weiteres von der Stabzuführeinrichtung 18 wegweisendes, ebenfalls geneigtes Leitblech 27 in Richtung des Pfeiles P₁₄ einem nicht dargestellten Ablage- und Zwischenmagazin zugeleitet werden. Diese Form der Abwurf- und Verteileinrichtung ist besonders zum Ausscheiden von nicht ververtbaren Restlängen vorteilhaft, und insbesondere für den Fall gedacht, daß die gegenüber der relativ langsamen Produktionsgeschwindigkeit der Biegeeinrichtung höhere Arbeitsgeschwindigkeit der Abwurf- und Verteileinrichtung 22 voll ausgenützt werden soll, um einen kontinuierlichen Betrieb zu gewährleisten.2 shows a further exemplary embodiment of a device according to the invention. In this device, the rods S are fed to a discharge and distribution device 22, which essentially corresponds to the discharge device 3 according to FIG. 1, via a feed device 4 according to FIG. 1, which, as in the exemplary embodiment according to FIG. 1, loads with different forms of rod material can be. The rod ejection device 22 has at least one pivotable discharge channel 5, which is arranged on a channel support 6 and can be pivoted in accordance with the double arrow P₂. Below the rod ejection device 22 is connected to a lateral, in the longitudinal direction of the bars guide plates 23 provided discharge channel 24, which guides the rods S in the direction of arrow P₃ to a pivotable according to the double arrow P₁₂ distribution flap 25. depending on the position of the distribution flap 25, the rods S can either be passed through an inclined baffle 26 above the rod feeder 18 in the direction of arrow P₁₃ to the rod feeder 18 or, alternatively, via another rod baffle 18 pointing away, also inclined baffle 27 in the direction the arrow P₁₄ a filing and intermediate magazine, not shown become. This form of the ejection and distribution device is particularly advantageous for the removal of non-convertible remaining lengths, and is particularly intended for the case in which the higher working speed of the ejection and distribution device 22 is to be fully utilized compared to the relatively slow production speed of the bending device, in order to ensure continuous operation to guarantee.

Die Stäbe S werden mit Hilfe der Stabzufuhreinrichtung 18 in Richtung des Pfeiles P₁₀ in die Greifzangenkbpfe 10 der Überfuhreinrichtung 8 gefördert, die gemäß Fig. 2 in ihrer ersten Stellung zwischen die parallelen, endlos umlaufenden Fördereinheiten der Stabzuführeinrichtung eingreifen. Nachdem die Zangenköpfe 10 mit der zu biegenden Anzahl von Stäben gefüllt sind, schließen die Zangenbacken 14˝, gegebenenfalls erst nachdem eine in Fig. 2 nicht dargestellte Ausrichteinrichtung die Stäbe endseitig ausgerichtet hat, und die Schwenkarme 9 schwenken aus der Aufnahmestellung in die Biegestellung.The rods S are conveyed with the help of the rod feed device 18 in the direction of arrow P₁₀ into the gripping pliers heads 10 of the transfer device 8 which, according to FIG. 2, engage in their first position between the parallel, endlessly rotating conveyor units of the rod feed device. After the pliers heads 10 are filled with the number of rods to be bent, the pliers jaws 14˝ close, if necessary only after an alignment device (not shown in FIG. 2) has aligned the ends of the rods, and the swivel arms 9 pivot from the receiving position into the bending position.

Um die Positionierung der Stäbe S zwischen dem Biegedorn 11 und dem Biegebolzen 12 zu ermöglichen, ist es, wie beim Ausführungsbeispiel nach Fig. 2 dargestellt, möglich, entweder den Oberteil des Schwenkarmes 9 in seiner Höhe entsprechend dem Doppelpfeil P₅ zu verschieben oder den gesamten Biegekopf 13 oder auch nur den Biegebolzen 12 entsprechend dem Doppelpfeil P₁₅ abzusenken. Ein zur Abstützung von Bugeln mit langen Schenkellängen dienendes Auflageblech 17‴, das ortsfest und für beide Gestelle 2, 2′ gemeinsam oder in zwei mit den Gestellen verbundenen Teilen ausgebildet sein kann, ist nur schematisch dargestellt.In order to enable the positioning of the bars S between the bending mandrel 11 and the bending pin 12, it is possible, as shown in the exemplary embodiment according to FIG. 2, to either move the upper part of the swivel arm 9 in height in accordance with the double arrow P₅ or to move the entire bending head 13 or just lower the bending pin 12 according to the double arrow P₁₅. A support plate for supporting prongs with long leg lengths 17 ‴, which can be stationary and can be designed for both frames 2, 2 'together or in two parts connected to the frames, is only shown schematically.

Die für die Bewegung der einzelnen Einrichtungen notwendigen Antriebs- und Betätigungselemente sind in bekannter Weise ausgebildet und der Übersicht halber in den Fig. 1 und 2 weggelassen.The drive and actuating elements necessary for the movement of the individual devices are designed in a known manner and are omitted in FIGS. 1 and 2 for the sake of clarity.

Bei der in Fig. 2 dargestellten Ausführungsform könnten die Greifzangen statt in der Aufnahmestellung zwischen parallele Fördereinheiten der Stabzufuhreinrichtung 18 einzugreifen auch vor dem Ablaufende bzw. unterhalb des Ablaufendes der Fördereinheiten bzw. eines einzigen endlos umlaufenden Förderorganes angeordnet sein.In the embodiment shown in FIG. 2, the gripping tongs could also engage before the end of the drain or below instead of in the receiving position between parallel conveyor units of the rod feed device 18 the end of the conveyor units or a single endlessly rotating conveyor element.

Eine alternative Ausführung der Überführeinrichtung 8′ weist zwei Greifzangen 28 auf, die je gemäß Fig. 3 ausgebildet sind, in welcher eine Ansicht der Innenseite des Biegegestells 2 gezeigt ist. Die Greifzange 28 weist einen abgewinkelten Klemmarm 29 und einen ebenfalls abgewinkelten Klemmhebel 30 auf, der aus einem kurzen Hebelarm 30′ und einem langen Hebelarm 30˝ gebildet ist. Der Klemmarm 29 ist an einem Ende und der Klemmhebel 30 an seiner Abwinkelungsstelle auf einem gemeinsamen, exzentrisch angeordneten Lagerzapfen 31 einer nur strichliert angedeuteten Exzenterkurbel 32 schwenkbar gelagert. Am Klemmarm 29 ist als Antriebseinrichtung ein hydraulisch betätigbarer Arbeitszylinder 33 montiert, dessen Kolbenstange 34 am kurzen Hebelarm 30′ des Klemmhebels 30 angelenkt ist.An alternative embodiment of the transfer device 8 'has two gripping tongs 28, which are each designed according to FIG. 3, in which a view of the inside of the bending frame 2 is shown. The gripping pliers 28 has an angled clamping arm 29 and a likewise angled clamping lever 30, which is formed from a short lever arm 30 'and a long lever arm 30'. The clamping arm 29 is pivotally mounted at one end and the clamping lever 30 at its bending point on a common, eccentrically arranged bearing journal 31 of an eccentric crank 32, which is only indicated by a broken line. On the clamping arm 29, a hydraulically actuated working cylinder 33 is mounted as the drive device, the piston rod 34 of which is articulated on the short lever arm 30 'of the clamping lever 30.

Durch Betätigung der Antriebseinrichtung 33 führt die Kolbenstange 34 eine Linearbewegung entsprechend dem Doppelpfeil P₁₆ aus, so daß der Klemmhebel 30 entsprechend dem Doppelpfeil P₁₇ relativ zum Klemmarm 29 verschwenkt wird, wodurch die Stäbe S zwischen Klemmbacken 35 am freien Ende des Klemmarmes 29 und des Hebelarmes 30˝ festgeklemmt werden.By actuating the drive device 33, the piston rod 34 performs a linear movement corresponding to the double arrow P₁₆, so that the clamping lever 30 is pivoted relative to the clamping arm 29 according to the double arrow P₁₇, whereby the rods S between the jaws 35 at the free end of the clamping arm 29 and the lever arm 30th ˝ be clamped.

Die in der Schließstellung zueinander parallelen Klemmbacken 35 bestehen aus nachgiebigem, moglichst verschleißfestem Material, so daß mehrere Stäbe S auch bei nicht vollkommen paralleler Stellung der Klemmbacken und bei Schwankungen im Durchmesser der einzelnen Stäbe sicher festgeklemmt werden können.The clamping jaws 35, which are parallel to one another in the closed position, consist of flexible, wear-resistant material as possible, so that several rods S can be securely clamped even when the clamping jaws are not completely parallel and in the event of fluctuations in the diameter of the individual rods.

Die den Schwenkarm für die Greifzange bildende Exzenterkurbel 32 ist mit ihrer Schwenkachse 36, die auf der Achse X-X des zentralen Biegedornes 11 liegt, an der Innenseite des jeweiligen Biegegestelles 2 bzw. 2′ gelagert und führt unter der Wirkung einer nicht dargestellten Antriebseinrichtung eine Schwenkbewegung entsprechend dem Doppelpfeil P₁₈ aus. Konzentrisch zur Schwenkachse 36 der Exzenterkurbel 32 ist außerdem ein Schwenkarm 37 an der Innenseite des jeweiligen Biegegestelles 2 bzw. 2′ schwenkbar gelagert, der unter der Wirkung einer weiteren, ebenfalls nicht dargestellten Antriebseinrichtung eine Schwenkbewegung entsprechend dem Doppelpfeil P₁₉ ausführt. Dabei kann die Lagerung des Schwenkarmes 37 beispielsweise durch eine nicht dargestellte Hohlwelle gebildet sein, in der wiederum die Exzenterkurbel 32 konzentrisch gelagert ist.The eccentric crank 32 forming the swivel arm for the gripping tongs is mounted with its swivel axis 36, which lies on the axis XX of the central bending mandrel 11, on the inside of the respective bending frame 2 or 2 'and performs a swiveling movement accordingly under the action of a drive device, not shown the double arrow P₁₈. Concentric to the pivot axis 36 of the eccentric crank 32 is also a pivot arm 37 on the Inside of the respective bending frame 2 or 2 'pivotally mounted, which performs a pivoting movement according to the double arrow P₁ unter under the action of a further drive device, also not shown. The mounting of the swivel arm 37 can be formed, for example, by a hollow shaft, not shown, in which the eccentric crank 32 is in turn mounted concentrically.

Das freie Ende des Schwenkarmes 37 ist über eine Verbindungslasche 38 mit dem Klemmarm 29 gekuppelt, wobei sich der Anlenkpunkt möglichst nahe am freien Ende des Klemmarmes 29 befindet. Die Verbindungslasche 38 bewirkt eine zwangsweise Koppelung der Bewegungen des Klemmarmes 29 und des Klemmhebels 30.The free end of the swivel arm 37 is coupled to the clamping arm 29 via a connecting link 38, the articulation point being as close as possible to the free end of the clamping arm 29. The connecting strap 38 forces the movements of the clamping arm 29 and the clamping lever 30 to be coupled.

Die vorstehend geschilderte Überführeinrichtung arbeitet wie folgt: Die Stäbe S gelangen über ein entsprechend dem Ausführungsbeispiel nach Fig. 1 ausgebildeten Auflauf- und Gleitblech 7 in eine Sammeleinrichtung 39, die nur schematisch angedeutet und an einem nicht gezeigten, ortsfesten Bauteil der Vorrichtung angeordnet ist. Die Sammeleinrichtung 39 hat vorzugsweise Ü-förmigen Querschnitt und solche Tiefe, daß alle gleichzeitig zu biegenden Stäbe lagerichtig übereinander angeordnet und von der Greifzange 28 aufgenommen werden können. Zur Anpassung der Sammeleinrichtung 39 an unterschiedliche Durchmesser der zu biegenden Stäbe kann eine Seitenwand 40 der Sammeleinrichtung 39 gegebenenfalls relativ zur gegenüberliegenden Seitenwand parallel verschiebbar ausgebildet sein.The transfer device described above works as follows: The rods S pass via a baffle and sliding plate 7 designed in accordance with the exemplary embodiment according to FIG. 1 into a collecting device 39, which is only indicated schematically and is arranged on a stationary component of the device, not shown. The collecting device 39 preferably has a U-shaped cross section and a depth such that all the rods to be bent at the same time can be arranged in the correct position one above the other and can be picked up by the gripping pliers 28. In order to adapt the collecting device 39 to different diameters of the rods to be bent, a side wall 40 of the collecting device 39 can optionally be designed to be displaceable parallel to the opposite side wall.

Zur Übernahme der Stäbe aus der Sammeleinrichtung 39 wird die Greifzange 28 durch Betätigung der Exzenterkurbel 32 und des Schwenkarmes 37 entsprechend dem Doppelpfeil P₂₀ in die durch die Sammeleinrichtung 39 definierte Aufnahmestellung geschwenkt. Durch Betätigung der Antriebseinrichtung 33 schwenkt der Klemmhebel 30 entsprechend dem Doppelpfeil P₁₇ gegen den Klemmarm 29, so daß alle Stäbe zwischen den Klemmbacken 35 sicher festgeklemmt werden. Vor dem Festlegen der Stäbe in der Greifzange 28 werden die Stäbe gegebenenfalls mit einer in Fig. 3 nicht dargestellten, unter Bezugnahme auf Fig. 1 beschriebenen Ausrichteinrichtung endseitig ausgerichtet.To take over the rods from the collecting device 39, the gripping pliers 28 are pivoted into the receiving position defined by the collecting device 39 by actuating the eccentric crank 32 and the swivel arm 37 in accordance with the double arrow P₂₀. By actuating the drive device 33, the clamping lever 30 pivots according to the double arrow P₁₇ against the clamping arm 29, so that all the rods between the clamping jaws 35 are securely clamped. Before setting the rods in the gripper 28, the If necessary, rods are aligned at the end with an alignment device, not shown in FIG. 3, described with reference to FIG. 1.

Durch weitere Betätigung der Exzenterkurbel 32 und des Schwenkarmes 37 gelangen die Stäbe nunmehr zwischen Klemmarm 29 und Klemmhebel 30 festgeklemmt in die Biegestellung zwischen die auf dem Biegeteller 13 angeordneten Biegeorgane 11, 12.By further actuation of the eccentric crank 32 and the swivel arm 37, the rods now get clamped between the clamping arm 29 and the clamping lever 30 into the bending position between the bending members 11, 12 arranged on the bending plate 13.

Während des Verstellens des oder dem Biegegestelle 2 bzw. 2′ werden die Stäbe mittels der Greifzange 28 eines der Biegegestelle festgehalten, wogegen die Greifzange 28 des anderen Biegegestelles zum Führen der übereinanderliegenden Stäbe geringfügig geöffnet wird, um ein Gleiten der Stäbe zwischen den Klemmbacken 35 ohne Veränderung der Stabanordnung zu ermöglichen.During the adjustment of the bending frame 2 or 2 ', the rods are held by means of the gripping pliers 28 of one of the bending frames, whereas the gripping pliers 28 of the other bending frame are opened slightly to guide the superimposed rods to prevent the rods from sliding between the clamping jaws 35 Allow changing the rod arrangement.

Im Rahmen der Erfindung ist es alternativ auch möglich, die Greifzange 28 des oben erwähnten anderen Biegegestelles ganz zu öffnen und die Stäbe nur durch die einen entsprechend engen Führungsspalt bildenden Biegeorgane 11, 12 zu führen.In the context of the invention, it is alternatively also possible to open the gripping pliers 28 of the other bending frame mentioned above and to guide the bars only through the bending members 11, 12 forming a correspondingly narrow guide gap.

Um bei dem unter Bezugnahme auf Fig. 3 beschriebenen Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung einen Biegerichtungswechsel durchführen zu können, wird die Exzenterkurbel 32 betätigt und der Schwenkarm 37 so verschwenkt, daß der Klemmarm entsprechend dem Doppelpfeil P₅ gemeinsam angehoben und die von den geschlossenen Greifzangen 28 gehaltenen Stäbe 29 und der Klemmhebel 30 aus der Biegestellung herausgehoben, anschließend durch gemeinsames Schwenken des Klemmarmes 29 und des Klemmhebels 30 entsprechend dem Doppelpfeil P₂₀ von einer Seite des zentralen Biegedornes 11 auf die andere Seite desselben übergeführt und abschließend, nach erfolgtem Positionswechsel des Biegebolzens 12 durch gemeinsames Absenken des Klemmarmes 29 und des Klemmhebels 30 entsprechend dem Doppelpfeil P₅ in die neue Biegestellung abgesenkt werden. Die Exzenterkurbel 32 und der Schwenkarm 37 sind in ihren Bewegungsabläufen so aufeinander abgestimmt, daß die übereinanderliegenden Stäbe bei den Überführbewegungen immer parallel zum zentralen Biegedorn 11 ausgerichtet bleiben.In order to be able to carry out a change of bending direction in the exemplary embodiment of a device according to the invention described with reference to FIG. 3, the eccentric crank 32 is actuated and the pivot arm 37 is pivoted such that the clamping arm is raised together in accordance with the double arrow P₅ and the rods held by the closed gripping tongs 28 29 and the clamping lever 30 lifted out of the bending position, then by jointly pivoting the clamping arm 29 and the clamping lever 30 according to the double arrow P₂₀ transferred from one side of the central mandrel 11 to the other side of the same and finally, after a change in position of the bending pin 12 by lowering them together the clamping arm 29 and the clamping lever 30 are lowered in accordance with the double arrow P₅ in the new bending position. The eccentric crank 32 and the swivel arm 37 are coordinated in their movements so that the superimposed rods during the transfer movements always stay parallel to the central mandrel 11.

Nach Beendigung aller Biegevorgänge werden die Exzenterkurbel 32 und der Schwenkarm 37 erneut betätigt, so daß die Stäbe bei geschlossener Greifzange 28 durch gemeinsames Heben des Klemmarmes 29 und des Klemmhebels 30 entsprechend dem Doppelpfeil P₅ aus der Biegestellung herausgehoben werden. Anschließend werden die Stäbe durch gemeinsames Schwenken des Klemmarmes 29 und des Klemmhebels 30 entsprechend dem Doppelpfeil P₂₀ aus dem Bereich der Auflagefläche 17 des Biegegestelles 2 geschwenkt und abschließend durch gemeinsames Absenken des Klemmarmes 29 und des Klemmhebels 30 und nach Öffnen der Greifzange 28 mit Hilfe der Klemmantriebseinrichtung 33 auf ein vorzugsweise geneigtes Ablaufblech 41 abgelegt.After completion of all bending operations, the eccentric crank 32 and the swivel arm 37 are actuated again, so that the bars are lifted out of the bending position when the gripper 28 is closed by lifting the clamping arm 29 and the clamping lever 30 together according to the double arrow P Doppel. Then the rods are pivoted by jointly pivoting the clamping arm 29 and the clamping lever 30 according to the double arrow P₂₀ from the area of the bearing surface 17 of the bending frame 2 and finally by lowering the clamping arm 29 and the clamping lever 30 together and after opening the gripping pliers 28 with the aid of the clamping drive device 33 placed on a preferably inclined drain plate 41.

Die Überführeinrichtung 8′ gemäß Fig. 3 sowie die erläuterte Sammeleinrichtung können auch bei der in Fig. 2 dargestellten Ausführungsform Anwendung finden.The transfer device 8 'according to FIG. 3 and the illustrated collecting device can also be used in the embodiment shown in FIG. 2.

Um bei der Vorrichtung nach den Fig. 1 und 2 einen Biegerichtungswechsel durchführen zu können, werden wie beim Ausführungsbeispiel nach Fig. 3 die Schwenkarme 9 und die Greifzangen 10 zum Überführen der Stäbe von einer Seite des zentralen Biegedornes 11 auf die andere Seite desselben angesteuert. Ferner werden diese Schwenkarme und Greifzangen zum Herausheben und Abwerfen der Stäbe nach Beendigung aller Biegevorgänge angesteuert.In order to be able to carry out a change in the bending direction in the device according to FIGS. 1 and 2, the swivel arms 9 and the gripping tongs 10 for transferring the rods from one side of the central bending mandrel 11 to the other side thereof are actuated, as in the exemplary embodiment according to FIG. Furthermore, these swivel arms and gripping tongs are actuated to lift and eject the bars after all bending processes have been completed.

Zur Steuerung der ansteuerbaren, beweglichen Einrichtungen und zur Abstimmung der Bewegungen dieser Einrichtungen aufeinander, sowie zum Steuern und Überwachen des Stabtransportes von den Zuführeinrichtungen bis in die Biegeeinrichtung, insbesondere zum individuellen Steuern der Schwenkarme und Greifzangen, und zur Durchführung der geforderten Biegungen an den Stäben ist eine nicht dargestellte Steuereinrichtung vorgesehen, mit welcher die Antriebs- und Betätigungselemente gesteuert werden.To control the controllable, movable devices and to coordinate the movements of these devices with each other, as well as to control and monitor the bar transport from the feeders to the bending device, in particular for the individual control of the swivel arms and gripping tongs, and to carry out the required bends on the bars a control device, not shown, is provided with which the drive and actuating elements are controlled.

Es versteht sich, daß die Erfindung nicht auf die dargestellten Ausführungsbeispiele beschränkt ist, diese können vielmehr im Rahmen des unabhängigen Anspruchs verschiedentlich abgewandelt werden. Insbesondere könnten bei den gezeigten Ausführungsbeispielen mehr als zwei Schwenkarme mit Greifzangen vorgesehen sein, die abwechselnd arbeiten, um einen kontinuierlichen Betrieb zu ermöglichen.It is understood that the invention is not limited to the exemplary embodiments shown, but rather they can be within the scope of the independent claim be modified in various ways. In particular, in the exemplary embodiments shown, more than two swivel arms with gripping tongs could be provided, which work alternately in order to enable continuous operation.

Claims (20)

  1. Apparatus (1) for bending steel bars (S) to form concrete reinforcement elements, having a device (3, 4, 18) for feeding bars (S) to a transfer device (8; 8'), by means of which in each case one group of bars can be inserted between bending members (11, 12) in the transverse direction of the bars, characterised in that two frames (2, 2') are provided, which are adjustable relative to each other with mutual spacing in the longitudinal direction of the bars and which are each fitted with a set of bending members (11, 12) and with operation-controlled gripper tongs (10, 28) as transfer device (8; 8'), which can be swivelled from a receiving position, in which they receive a plurality of bars from the bar feed device (3, 4, 18) and clamp said bars, in the transverse direction of the bars into an insertion position, in which they insert the bars (S) into the gap between the bending members (11, 12).
  2. Apparatus according to claim 1, characterised in that at least one of the gripper tongs (10; 28) can be actuated in the closing direction for clamping the bars during the bending process and/or in the opening direction during the adjusting of the frames (2, 2').
  3. Apparatus according to Claim 1 or 2, characterised in that each gripper tong (10) is arranged at the end of a swivel arm (9) which is adjustable in a controlled telescopic manner, which arm is mounted on the inner side of the frame (2, 2').
  4. Apparatus according to Claim 3, characterised in that the jaws (14', 14'') of the gripper tongs are mounted so as to be jointly swivellable on the swivel arm (9) in the form of a gripper tong head (10).
  5. Apparatus according to Claims 2 to 4, characterised in that the transfer device (8, 8') has a separate operating device for each gripper tong (10, 28) and each gripper tong (10; 28), in turn, is fitted with a separate operating device for the controlled opening and closing of said gripper tongs.
  6. Apparatus according to Claims 1 or 2, characterised in that each gripper tong (28) has a clamping arm (29) and a clamping lever (30) which can be swivelled towards said clamping arm, which clamping arm and clamping lever are linked to each by means of a bearing pin (31) and are movable relatively towards each other and away from each other by means of a drive device (33, 34) engaging both parts, and in that the transfer device (8') has as operating device for each gripper tong (28) a driveable eccentric crank (32), which bears the bearing pin (31) and is mounted on the inside of the bending frame (2 or 2'), a separately driveable swivel arm (37), which is mounted concentrically to said eccentric crank on the inside of the bending frame, and a strap (38) which connects the swivel arm (37) to the clamping arm (29).
  7. Apparatus according to Claims 1 to 6, characterised in that, in the region of the receiving position of the gripper tongs (10; 28), the frames (2, 2') have a buffer surface (7) for bars fed by the bar feed device (3, 4, 18) in the transverse direction of the bars, an alignment device (15) being assigned to the buffer surface (7) for mutual alignment of the one end of the bars (S), the alignment device (15) preferably having a fixed stopper (15'') and a slidable stopper portion (15').
  8. Apparatus according to Claim 7, characterised in that, above the buffer surface (7), the bar feed device (3, 4, 18) has a bar discharge device (3), by means of which bars can be fed individually in succession to the buffer surface.
  9. Apparatus according to one of Claims 1 to 6, characterised in that the bar feed device (3, 4, 18) has parallel continuous circulating conveyor units (19), between which the gripper tongs (10; 28) engage in their receiving position.
  10. Apparatus according to Claim 9, characterised in that a discharge device (3) for the bars (S) is arranged above the run-in end of the conveyor units (19), which discharge device has at least one swivel channel (5) for discharging one bar (S) in each case, a distributor flap (25) or the like preferably being provided between the discharge device (3) and the conveyor units (19) for passing the bar to the conveyor units (19) or away from the latter.
  11. Apparatus according to one of Claims 1 to 6, characterised in that the gripper tongs (10; 28) in their receiving position are arranged in the region of the run-off end of a continuous, circulating conveyor member of the bar feed device (18).
  12. Apparatus according to one of Claims 1 to 11, characterised in that the bending member (12) facing each gripper tong (10; 28) is arranged in the frame (2, 2') so as to be lowerable for inserting the bars (S) between the bending members (11, 12).
  13. Apparatus according to one of Claims 1 to 12, characterised in that a bending head (13, 13') bearing the bending members (11, 12) is arranged in the frame (2, 2') so as to be lowerable for inserting the bars (S) between the bending members (11, 12).
  14. Apparatus according to Claim 13, characterised in that the bending head (13, 13') is arranged in the frame (2, 2') so as to be displaceable in the longitudinal direction of the bars.
  15. Apparatus according to one of Claims 1 to 14, characterised in that a resting surface (17) for the bent bars (S) is assigned to each frame (2, 2'), at least one part (17''; 17''') of which resting surface is located above the swivel range of the gripper tongs (10; 28).
  16. Apparatus according to Claims 1 to 15, characterised in that the operating devices of the transfer device (8; 8') can be actuated for transferring the bars (S) from one side of a central bending mandrel (11) to the other side of the latter for the purpose of reversing the bending direction.
  17. Apparatus according to one of Claims 5 to 16, characterised in that the operating device of one of the gripper tongs (10, 28) can be actuated for guiding a plurality of bars (S) arranged above one another during the adjustment of the bending frames (2, 2') in the sense of a slight opening of the gripper tongs (10, 28).
  18. Apparatus according to one of Claims 16 to 17, characterised in that the operating devices of the transfer device (8; 8') can be actuated after completion of all the bending operations for lifting the bars (S) out of the bending position defined by the bending members (11, 12) and for guiding the bars (S) out of the region of the bending frames (2, 2') and the operating device of the gripper tongs (10; 28) can be actuated for opening the latter for the purpose of discharging the bars (S), preferably onto an inclined run-off plate (41).
  19. Apparatus according to one of Claims 1 to 18, characterised in that he bar feed device (3, 4, 18) has at its runn-off end a collection device (39) for the bars (S), from which the bars (S) can be transferred into the bending position with the aid of the gripper tongs (10; 28).
  20. Apparatus according to Claim 19, characterised in that the collection device (39) is of U-shaped construction in cross section and has a side wall (40) which is transversely displaceable relative to the longitudinal direction of the bars (S) corresponding to the diameter of the bars to be bent.
EP90890230A 1989-09-20 1990-07-30 Apparatus for bending concrete reinforcing bars Expired - Lifetime EP0419441B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT220689A AT393641B (en) 1989-09-20 1989-09-20 Apparatus for bending steel rods to form concrete reinforcing elements
AT2206/89 1989-09-20
AT279/90 1990-02-08
AT27990A AT394958B (en) 1990-02-08 1990-02-08 Apparatus for bending steel rods to form concrete reinforcing elements

Publications (2)

Publication Number Publication Date
EP0419441A1 EP0419441A1 (en) 1991-03-27
EP0419441B1 true EP0419441B1 (en) 1995-04-19

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EP90890230A Expired - Lifetime EP0419441B1 (en) 1989-09-20 1990-07-30 Apparatus for bending concrete reinforcing bars

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US (1) US5182932A (en)
EP (1) EP0419441B1 (en)
JP (1) JPH04501825A (en)
AT (1) ATE121324T1 (en)
AU (1) AU6055590A (en)
CA (1) CA2042021A1 (en)
DE (1) DE59008926D1 (en)
ES (1) ES2020909A4 (en)
GR (1) GR910300061T1 (en)
PT (1) PT95366A (en)
WO (1) WO1991004113A1 (en)

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WO2022234608A1 (en) * 2021-05-06 2022-11-10 Schnell S.P.A. Method and apparatus for processing bars

Also Published As

Publication number Publication date
EP0419441A1 (en) 1991-03-27
ES2020909A4 (en) 1991-10-16
PT95366A (en) 1992-05-29
WO1991004113A1 (en) 1991-04-04
ATE121324T1 (en) 1995-05-15
AU6055590A (en) 1991-04-18
GR910300061T1 (en) 1991-11-15
DE59008926D1 (en) 1995-05-24
US5182932A (en) 1993-02-02
CA2042021A1 (en) 1991-03-21
JPH04501825A (en) 1992-04-02

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